KR20220052084A - Electronic apparatus and noise filter - Google Patents

Abstract

An electronic device of the present invention includes a power circuit part including a noise filter for removing a noise occurring during power supply. The noise filter includes a core, and first and second coils. The core includes: a main core on which the first and second coils are wound apart from each other; a sub core extended from one end of the main core to one side or both sides, and provided to form a closed magnetic circuit through which a magnetic flux can pass together with the main core; and a balance core provided to protrude from one position of the main core between the first and second coils in a vertical direction with respect to the main core. The balance core has a size set based on impedance for reducing a first noise due to currents flowing in a power line in the same direction, and a second noise due to currents flowing in the power line in different directions.

Description

Electronic device and noise filter included therein

The present invention relates to an electronic device and a noise filter included therein, and more particularly, to an electronic device capable of reducing common mode noise and normal mode noise, and a noise filter included therein.

Types of noise include spatial noise transmitted to the air and conducted noise transmitted through transmission lines such as power lines, signal lines, and ground lines of electronic devices.

Among them, conducted noise is classified into common mode noise (C) generated between the power line and ground, and normal mode noise (N) generated between the power line, that is, the input/output line of AC power. can be Except in special cases, the electronic device has a state in which both common mode noise (C) and normal mode noise (N) exist.

Therefore, in order to prevent electromagnetic interference (EMI) caused by such noise, a common mode noise filter for suppressing common mode noise and a normal mode noise filter for suppressing normal mode noise may be provided in the electronic device, respectively. there is.

In this case, since the common mode noise filter and the normal mode noise filter are individually manufactured and mounted on the power board, manufacturing cost may increase. In addition, since an installation space for each of the individual noise filters is required in the power board, there are restrictions in realizing slimming and miniaturization of the power board or electronic device.

The present invention provides an electronic device capable of improving productivity and reducing manufacturing cost by integrally implementing a common mode noise filter and a normal mode noise filter, and a noise filter included therein.

In addition, the present invention provides an electronic device capable of realizing slimming and miniaturization of a power board and an electronic device through an integrated noise filter that can be installed in a small space, and a noise filter included therein.

An electronic device according to an embodiment of the present invention includes a power circuit unit including a noise filter for removing noise generated when power is supplied, and the noise filter includes a core, and first and second coils wound around the core. Including, the core, the first coil and the second coil is spaced apart from each other, the main core is wound; a sub-core extending from one end of the main core to one or both sides and provided to meet at the other end of the main core to form a closed path through which magnetic flux can pass together with the main core; a balance core provided to protrude in a vertical direction with respect to the main core at one position of the main core between the first coil and the second coil, wherein the balance core includes a balance core caused by a current flowing in the same direction in the power line of the power circuit unit It has a size determined based on an impedance for reducing one noise and a second noise caused by a current flowing in a different direction through the power line.

The size may include at least one of the length and thickness of the balance core.

A gap may be provided between the sub-core and the balance core to correspond to the length of the balance core.

The noise filter reduces the first noise by the magnetic flux generated by the current flowing in the same direction in the first coil and the second coil, and in the magnetic flux generated by the current flowing in the first coil and the second coil in different directions. Accordingly, the second noise can be reduced.

The noise filter reduces the first noise by the magnetic flux passing through the first path through the main core and the sub-core, and the second noise by the magnetic flux passing through the second path through the main core, the balance core, and the sub-core sequentially can be reduced.

The impedance of the first path through which the magnetic flux for reducing the first noise passes may be inversely proportional to the size of the balance core.

The impedance of the second path through which the magnetic flux for reducing the second noise passes may be proportional to the size of the balance core.

In the second path, the magnetic flux in the first direction by the first coil and the magnetic flux in the second direction by the second coil repel each other in the central part of the main core and branch to both sides through the balance core, and the branched magnetic flux is generated by the sub-core It is possible to form a loop that returns to both ends of the main core.

The second path may form a loop in which one side is open.

The first path may form a loop from one end of the main core passing through the sub-core and returning to the other end of the main core.

Meanwhile, an electronic device according to another embodiment of the present invention includes a power circuit unit including a noise filter for removing noise generated when power is supplied, and the noise filter includes a core, a first coil wound around the core, and a first coil wound around the core. a pair of main cores including two coils, the cores being arranged in parallel at a predetermined distance, the first coil and the second coil wound thereon, respectively; a pair of sub-cores connecting the pair of main cores at upper and lower portions, respectively; a balance core disposed parallel to the main core from one position of one sub-core among the pair of sub-cores toward the other sub-core, wherein the balance core includes a current flowing in the same direction to a power line of the power circuit unit It has a size determined based on the impedance for reducing the first noise caused by and the second noise caused by the current flowing in the power line in a different direction.

The noise filter reduces the first noise by the magnetic flux generated by the current flowing in the same direction in the first coil and the second coil, and in the magnetic flux generated by the current flowing in the first coil and the second coil in different directions. Accordingly, the second noise can be reduced.

The impedance of the first path of the magnetic flux for reducing the first noise may be inversely proportional to the size of the balance core.

The impedance of the second path of the magnetic flux for reducing the second noise may be proportional to the size of the balance core.

In the second path, the magnetic flux in the first direction by the first coil and the magnetic flux in the second direction by the second coil repel each other in the central part of the sub-core, pass through the balance core, and return to the main core through the sub-core. , some of which may form an open loop.

Meanwhile, the noise filter for removing noise generated when power is supplied to an electronic device according to an embodiment of the present invention includes a core, and first and second coils wound around the core, and the core includes the first coil. and a main core wound with a second coil spaced apart from each other. a sub-core extending from one end of the main core to meet at the other end of the main core; a balance core provided to protrude in a vertical direction with respect to the main core at one position of the main core between the first coil and the second coil, wherein the balance core includes a balance core caused by a current flowing in the same direction in the power line of the power circuit unit It has a size determined based on an impedance for reducing one noise and a second noise caused by a current flowing in a different direction through the power line.

The noise filter reduces the first noise by the magnetic flux generated by the current flowing in the same direction in the first coil and the second coil, and in the magnetic flux generated by the current flowing in the first coil and the second coil in different directions. Accordingly, the second noise can be reduced.

The first noise can be reduced by the magnetic flux passing through the first path through the main core and the sub-core, and the second noise can be reduced by the magnetic flux passing through the second path through the main core, the balance core, and the sub-core sequentially. there is.

The impedance of the first path of the magnetic flux for reducing the first noise is inversely proportional to the size of the balance core, and the impedance of the second path of the magnetic flux for reducing the second noise is proportional to the size of the size of the balance core. there is.

According to the electronic device and the noise filter included therein according to the embodiment of the present invention as described above, productivity can be improved and manufacturing cost can be reduced by implementing the common mode noise filter and the normal mode noise filter integrally.

In addition, through the integrated noise filter that can be installed in a small space, slimming and miniaturization of the power board and electronic devices can be realized.

1 is a schematic circuit diagram showing a circulation diagram of common mode noise and normal mode noise.
2 is a diagram illustrating a path of common mode noise.
3 is a diagram illustrating a path of normal mode noise.
4 is a diagram schematically illustrating a noise filter according to a first embodiment of the present invention.
5 is a perspective view illustrating the core of the noise filter according to the first embodiment of FIG. 4 .
6 is a perspective view illustrating a state in which a coil is wound around the core of FIG. 5 .
7 is a perspective view illustrating an example in which a core is coupled in the noise filter of FIG. 5 .
8 shows an example in which the core is integrally implemented in the noise filter according to the first embodiment of the present invention.
9 shows another example in which the core is implemented as a coupling type in the noise filter according to the first embodiment of the present invention.
10 shows another example in which a core is implemented as a coupling term in the noise filter according to the first embodiment of the present invention.
11 is a graph for explaining a relationship between a frequency band and an impedance in a noise filter according to an embodiment of the present invention.
12 is a diagram illustrating a noise filter according to a second embodiment of the present invention.
13 shows an example in which the core is integrally implemented in the noise filter according to the second embodiment of the present invention.
14 shows another example in which the core is implemented as a coupling type in the noise filter according to the second embodiment of the present invention.
15 is a diagram illustrating a noise filter according to a third embodiment of the present invention.
16 shows an example in which the core is integrally implemented in the noise filter according to the third embodiment of the present invention.
17 shows another example in which a core is implemented as a coupling type in the noise filter according to the third embodiment of the present invention.
18 is a diagram illustrating a noise filter according to a fourth embodiment of the present invention.
19 is a diagram schematically illustrating a noise filter according to a fifth embodiment of the present invention.
20 is a diagram illustrating an example of a path of magnetic flux in the noise filter of FIG. 19 .
21 is a diagram illustrating a noise filter according to a sixth embodiment of the present invention.
22 is a diagram illustrating a noise filter according to a seventh embodiment of the present invention.
23 shows an example in which the core is implemented as a coupling type in the noise filter according to the seventh embodiment of the present invention.
24 illustrates a circuit diagram of a related art in which a plurality of noise filters are provided as an example.
25 shows an example of a circuit diagram in which an integrated noise filter is provided according to an embodiment of the present invention.
26 is a block diagram illustrating a configuration of an electronic device including a noise filter according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numbers or symbols refer to components that perform substantially the same functions, and the size of each component in the drawings may be exaggerated for clarity and convenience of description. However, the technical spirit of the present invention and its core configuration and operation are not limited to the configuration or operation described in the following embodiments. In describing the present invention, if it is determined that a detailed description of a known technology or configuration related to the present invention may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted.

In an embodiment of the present invention, terms including an ordinal number such as first, second, etc. are used only for the purpose of distinguishing one element from another element, and the expression of the singular is plural, unless the context clearly dictates otherwise. includes the expression of In addition, in an embodiment of the present invention, terms such as 'consisting', 'comprising', 'having' and the like are one or more other features or numbers, steps, operations, components, parts, or the presence of a combination thereof. Or it should be understood that the possibility of addition is not precluded in advance. In addition, in an embodiment of the present invention, a 'module' or 'unit' performs at least one function or operation, and may be implemented as hardware or software or a combination of hardware and software, and is integrated into at least one module. and can be implemented. Further, in an embodiment of the present invention, at least one of the plurality of elements refers to all of the plurality of elements as well as each one or a combination thereof excluding the rest of the plurality of elements.

FIG. 1 is a schematic circuit diagram showing a circulation diagram of common mode noise and normal mode noise, FIG. 2 is a diagram illustrating a path of common mode noise, and FIG. 3 is a diagram illustrating a path of normal mode noise.

As shown in FIG. 1, the noise (conducted noise) transmitted through the transmission line is the common mode noise (C) (also called common-mode noise or common mode noise) generated between the power line and the ground, that is, the ground and the power supply. line, that is, normal mode noise (N) (also called normal noise) generated between an input line and an output line of AC power.

The common mode noise (C) may appear in both a live wire (L) (or an active wire) and a neutral wire (N), as shown in FIG. 2 , and the direction is the same. The noise current may have a path back to the input and output power lines (L, N) via the ground (Earth or Ground). The common mode noise C may be generated as noise having the same phase between the input/output power lines L and N and the ground.

As shown in FIG. 3 , the normal mode noise N is generated between the input/output power lines L and N, and the directions of the input and the output are opposite, so it is also called differential mode noise. The normal mode noise N may be generated by, for example, a surge of voltage or current generated in a switch circuit of the power circuit unit 110 .

In the present invention, the common mode noise (C) (hereinafter also referred to as first noise) and normal mode noise (N) (hereinafter referred to as "first noise") as described above through an integrated noise filter (hereinafter also referred to as a hybrid filter) are used. , also called second noise) can be removed.

Hereinafter, in an embodiment of the present invention, a case in which a noise filter is provided in an electronic device will be described as an example. However, the object to which the noise filter of the present invention is mounted is not limited to an electronic device, and as another example, the noise filter may be provided in an adapter capable of supplying power to various electronic devices.

4 is a diagram schematically illustrating a noise filter according to a first embodiment of the present invention. FIG. 5 is a perspective view showing the core of the noise filter according to the first embodiment of FIG. 4 , FIG. 6 is a perspective view showing a coil wound around the core of FIG. 5 , and FIG. 7 is the noise filter of FIG. It is a perspective view showing an example in which the core is coupled.

In the first embodiment of the present invention, the noise filter 310 may be provided in the power circuit unit 110 to remove noise generated when power is supplied. For example, the noise filter 310 may be provided at a front end or a front end of a power board to which power is input from the outside.

In one embodiment, as shown in FIG. 4 , the noise filter 310 may be provided as an inductor including a core 40 and coils 51 and 52 wound around the core 40 .

The core 40 may be made of a magnetic material, which is a material having magnetism (magnetism) made of an iron compound such as ferrite, but is not limited thereto and may be made of various materials.

In one embodiment, the core 40 may provide a magnetic flux (MF) generated due to the current flowing in the coils 51 and 52, that is, a path through which the magnetic flux lines pass.

The coils 51 and 52 are made of a conductive material such as copper, but the present invention is not limited thereto, and various materials may be used.

The coils 51 and 52 may be electrically connected to a power line and a ground line of the power circuit unit 110 provided in the electronic device.

The coils 51 and 52 may be wound to have a predetermined pitch in one region of the core 40 to have a predetermined inductance, and may generate an induced electromotive force based on a change amount of current supplied from the power line.

In an embodiment, the noise filter 310 may include a first coil 51 and a second coil 52 wound to be spaced apart from each other.

In one embodiment, the core 40, as shown in FIGS. 4 and 5 , may include a main core 41 , a sub-core 42 , and a balance core 43 .

5 shows an example in which the main core 41, the sub-core 42, and the balance core 43 are manufactured in a separated form, and the entire core 40 is formed by bonding, as an example of the present invention. The implementation form of the noise filter 310 of the embodiment is not limited to that shown in FIG. 5 .

8 shows an example in which the core is integrally implemented in the noise filter according to the first embodiment of the present invention, and FIG. 9 is another example in which the core is implemented in a combined type in the noise filter according to the first embodiment of the present invention. and FIG. 10 shows another example in which the core is implemented as a coupling term in the noise filter according to the first embodiment of the present invention.

For example, as shown in FIG. 8 , the noise filter 310 may be manufactured as an integral core 40 that can be divided into a main core 41 , a sub core 42 and a balance core 43 . . As another example, in the noise filter 310 , as shown in FIG. 9 , the main core 41 and the balance core 43 are manufactured as a single cross-shaped core, and may be combined with the rectangular sub-core 42 . there is.

As another example, in the noise filter 310 , as shown in FIG. 10 , the main core 41 and the sub-core 42 are manufactured as a single “sun”-shaped single core, and the balance core 43 is the main The core 41 may have a shape surrounding its outer periphery at one location. Here, the balance core 43 may be configured by combining an upper balance core 43a in a “C” shape and a lower balance core 43b in a straight or bar shape.

As shown in FIGS. 4 and 6 , a first coil 51 and a second coil 52 spaced apart from each other may be wound on the main core 41 . That is, the main core 41 may be provided as a core in which the coils 51 and 52 are wound.

In the first embodiment of the present invention shown in FIG. 4 , the main core 41 is a centrally located core, also referred to as a central core or a center core.

The sub-core 42 may extend from one end of the main core 41 to meet at the other end of the main core 41 .

Specifically, as shown in FIG. 4 , the sub-cores 42 are provided as a pair, each branching from one end of the main core 41 located in the center and extending in different directions, that is, both sides, and the main The main core 41 may be joined at the other end to form a closed magnetic circuit through which the magnetic flux may pass together with the core 41 . In other words, the sub-cores 42 provided as a pair are symmetrical to each other with respect to the main core 41 , and each may extend from one end of the main core 41 to the other end.

Accordingly, a first loop through which magnetic flux may be circulated through the main core 41 and the sub-core 42 may be formed.

For example, the sub-cores 42 may be provided as a pair each having a shape of a digit (“c”), and a closed magnetic path may be formed by combining them. As another example, the sub-core 42 may be provided in a rectangular shape to form a closed magnetic path. As another example, the sub-core 42 is composed of four cores of a bar-shaped or straight-line (“一” shape) that can be combined, and may be manufactured in a form to form a Pesaro by combining.

In the first embodiment shown in Fig. 4, the sub-core 42 is a core located on both sides and both ends of the main core 41 located in the center, also referred to as a side core.

As shown in FIG. 4 , the balance core 43 protrudes in the vertical direction with respect to the main core 41 at one position of the main core 41 between the first coil 51 and the second coil 52 . It can be arranged so that The protruding balance core 43 has a shape extending toward the sub-core 42 .

The balance core 43 has a size determined based on a predetermined impedance for noise reduction, for example, a length (h) and a thickness (w), and between the balance core 43 and the sub-core 42 is a balance core ( 43), a gap g may be formed corresponding to the length h.

Accordingly, a second loop through which magnetic flux can be circulated through the main core 41 , the balance core 43 , and the sub-core 42 is formed, and the second loop has an open shape at one side.

In the first embodiment shown in FIG. 4 , the balance cores 43 are provided as a pair, each perpendicular to the main core 41 at a position between the first coil 51 and the second coil 52 . By protruding in the direction, each of the sub-cores 42 may extend toward the pair.

Balance core 43, for example, as shown in FIG. 7, may have a shape surrounding the outer periphery at one position of the main core 41. That is, a space portion is formed inside the balance core 43 , and the main core 41 may be inserted and coupled in the space portion. However, since this is only an example, the shape of the balance core 43 is not limited to that shown in FIG. 7 . For example, as another example, the balance core 43 is manufactured to have a cross shape integrally with the main core 41, as shown in FIG. 8 or FIG. 9, or, as shown in FIG. 10, the first and second balance cores ( 43a, 43b) may be manufactured in a combined form.

In the first embodiment of the present invention shown in FIG. 4 , the balance core 43 is a core located in the central portion of the main core 41 and is also referred to as a midfoot core.

In one embodiment of the present invention, the balance core 43, its size, that is, the length (h) and the thickness (w) may be implemented in a form that can be adjusted, respectively.

In an embodiment, the balance core 43 may be manufactured to have a predetermined size based on an impedance required to reduce noise in the noise filter 310 , that is, common mode noise and normal mode noise. That is, in the noise filter 310 , the size of the balance core 43 may be adjusted in response to its target impedance. The size of the balance core 43, for example, the relationship between the length and thickness, and the impedance will be described in detail with reference to FIGS. 7 and 11 .

In one embodiment, the noise filter 310 is configured to have two magnetic flux paths through the core 40, thereby removing both the first noise (common mode noise) and the second noise (normal mode noise or differential mode noise). It is provided as an integrated hybrid filter that can be used.

As shown in FIG. 4 , the noise filter 310 operates in a common mode in which current flows in the same direction in the first coil 51 and the second coil 52 to generate the first noise (common code). noise) and operate in a normal mode (or differential mode) in which current flows in different directions in the first coil 51 and the second coil 52 to operate the second noise (normal mode noise or differential mode) noise) can be removed.

Basically, since the electronic device has a state in which both the first noise and the second noise are present, the operation of the common mode and the operation of the normal mode are not temporally or spatially separated. ) operates in common mode and at the same time operates in normal mode.

In one embodiment, based on the operation of the noise filter 310 in the common mode, if current flows in the same direction in the first coil 51 and the second coil 52 , it is applied to the core 40 by electromagnetic induction. The magnetic flux MF1 may be generated in the first path as in the direction of the arrow.

In the common mode noise filter 310, as shown in FIG. 4, a magnetic flux path (first path) through which the magnetic flux (magnetic flux line) MF1 passes through the main core 41 and the sub-core 42 is formed. can be For example, in the common mode, the magnetic flux MF1 may form a loop (first loop) in the form of an approximately square ring in which the main core 41 and the sub-core 42 go around.

In the noise filter 310 according to the first embodiment of FIG. 4 , with the main core 41 as the center, one end of the main core 41 passes through the sub-core 42 to both sides and the other end of the main core 41 . A pair, that is, two magnetic flux paths returning to , can be formed.

The noise filter 310 may cancel, ie, reduce, the first noise, ie, common mode noise, by the magnetic flux MF1 generated to have the same path as described above.

On the other hand, in an embodiment, when current flows in different directions in the first coil 51 and the second coil 52 based on the operation of the noise filter 310 in the normal mode, the core 40 by electromagnetic induction ), the magnetic flux MF2 may be generated in the second path in the same direction as the arrow.

In the noise filter 310 of the normal mode, as shown in FIG. 4 , a magnetic flux path through which magnetic flux (magnetic flux line) MF2 sequentially passes through the main core 41 , the balance core 43 , and the sub-core 42 . (second path) may be formed.

For example, as shown in FIG. 4 , the magnetic flux in the first direction by the first coil 51 passing through the main core 41 and the magnetic flux in the second direction by the second coil 52 pass through the main core. They repel each other in the central part of 41 , and may branch in two different directions through the balance core 43 . The magnetic flux MF2 branched through the balance core 43 forms a pair of loops (second loops) in the shape of an approximately square ring that return back to both ends of the main core 41 through the sub-core 42, respectively. can be formed

In the noise filter 310 according to the first embodiment of FIG. 4 , with the main core 41 and the balanced core 43 as the center, the balance core 43 and the sub-core ( 42) and returning to both ends of the main core 41, two pairs, ie, four magnetic flux paths, may be formed.

The noise filter 310 may cancel, ie, reduce, the second noise, ie, normal mode noise, by the magnetic flux MF2 generated to have the same path as described above.

In one embodiment, the noise filter 310 has an impedance (characteristic impedance) determined based on the size of the balance core 43 , that is, the length h and the thickness w. In other words, the impedance of the noise filter 310 may be determined based on the length h and the thickness w of the balance core 43 .

The impedance Z may be determined by Equation 1 below.

Here, R is wire resistance, L is inductance, C is parasitic capacitance, and w is frequency.

11 is a graph for explaining a relationship between a frequency band and an impedance in a noise filter according to an embodiment of the present invention.

As shown in Equation 1, the impedance Z can be changed according to the frequency, and as shown in FIG. 11 , it can be seen that the impedance Z is high in the low band in the hybrid noise filter according to the embodiment of the present invention. That is, the noise filter 310 can reduce noise by adjusting the low-band impedance based on the length h and the thickness w of the balance core 43 .

In an embodiment, the impedance Z of the noise filter 310 may be changed as shown in Table 1 below according to the length h and the thickness w of the balance core 43 .

common mode normal mode Length of balance core (h) increase Increased leakage, reduced impedance Low-band impedance increase decrease Reduce leakage, increase impedance Low-band impedance reduction Thickness of balance core (w) increase Increased leakage, reduced impedance Low-band impedance increase decrease Reduce leakage, increase impedance Low-band impedance reduction

As shown in Table 1, the impedance in the common mode path may be changed (increased or decreased) in inverse proportion to the length h of the balance core 43 . Also, the impedance of the common mode path may be changed (increased or decreased) in inverse proportion to the thickness w of the balance core 43 .

In other words, as the length (h) or thickness (w) of the balance core 43 increases, the impedance of the common mode path decreases, and as the length (h) or thickness (w) of the balance core 43 decreases, The impedance of the common mode path may increase.

Accordingly, the noise filter 310 may reduce the common mode noise in response to the impedance of the common mode path determined based on the length h and the thickness w of the balance core 43 .

Impedance in the normal mode path may be changed (increased or decreased) in proportion to the length h of the balance core 43 . Also, the impedance of the normal mode path may be changed (increased or decreased) in proportion to the thickness w of the balance core 43 .

In other words, the impedance of the normal mode path increases as the length (h) or thickness (w) of the balance core 43 increases, and as the length (h) or thickness (w) of the balance core 43 decreases, The impedance of the normal mode path may decrease.

Accordingly, the noise filter 310 may reduce the normal mode noise in response to the impedance of the normal mode path determined based on the length h and the thickness w of the balance core 43 .

In the noise filter 310 according to an embodiment of the present invention, the size of the balanced core 43 is determined based on the impedance required to reduce the common mode noise and the normal mode noise, that is, the length (h) and the thickness (w). is manufactured to have In other words, the noise filter 310 can easily reduce common mode noise and normal mode noise by changing the impedance by adjusting the length (h) and thickness (w) of the balance core 43 .

Accordingly, an integrated hybrid noise filter capable of generating an impedance required for noise reduction by adjusting the size (size) of the balance core 43 is provided, thereby providing an advantage in manufacturing.

12 is a diagram illustrating a noise filter according to a second embodiment of the present invention.

In the noise filter 311 of the second embodiment shown in Fig. 12, a protrusion, that is, a protrusion 42a, is further formed on the sub-core 42 of the noise filter 310 of the first embodiment toward the balance core 43. characterized in that

Therefore, in the noise filter 310 of the first embodiment, descriptions of the configuration, operation, etc. other than the protrusions 42a of the sub-core 42 are equally applied to the noise filter 311 of the second embodiment, and the first embodiment Since the configuration having the same name as the noise filter 310 of the example performs the same role in the noise filter 311 of the second embodiment, a repeated description will be omitted.

12, in the noise filter 311 of the second embodiment, the pair of sub-cores 42 located on both sides of the main core 41 have a balance core 43 at one position, for example, at the center. ) A pair of protrusions 42a may be formed inward toward each other.

Accordingly, as the gap g' between the balance core 43 and the sub-core 42 decreases and the length of the balance core 43 increases (h+h') correspondingly, the impedance of the normal mode path increases. can do. Also, while the noise filter 311 operates in the normal mode, the density of the magnetic flux MF2 generated in the second path may be further improved by the protrusion 42a.

In the noise filter 311 according to the second embodiment, the core 40 includes a main core 41 , a sub-core 42 having protrusions 42a formed therein, and a balance core 43 , and the core 40 . may be manufactured as an integral or separate type.

13 shows an example in which the core is integrally implemented in the noise filter according to the second embodiment of the present invention, and FIG. 14 shows another example in which the core is implemented as a combined type in the noise filter according to the second embodiment of the present invention. do.

For example, as shown in FIG. 13 , the noise filter 311 has an integral core 40 that can be divided into a main core 41 , a sub-core 42 having protrusions 42a formed therein, and a balance core 43 . ) can be produced as As another example, in the noise filter 310 , as shown in FIG. 14 , the main core 41 and the balance core 43 are made of a single cross-shaped core, and a pair of protrusions 42a inward in a quadrangle. It may be combined with the sub-core 42 on which is formed.

15 is a diagram illustrating a noise filter according to a third embodiment of the present invention.

The noise filter 312 of the third embodiment shown in FIG. 15 has a different shape from the noise filter 310 of the first embodiment, and operates in the same manner as the noise filter 310 of the first embodiment to generate common mode noise. and normal mode noise can be reduced. Accordingly, descriptions of other configurations, operations, etc., in the noise filter 310 of the first embodiment except for its shape, are equally applied to the noise filter 312 of the third embodiment, and are identical to those of the noise filter 310 of the first embodiment. A configuration having a name performs the same role in the noise filter 312 of the third embodiment, and thus a redundant description will be omitted.

In the third embodiment, as shown in FIG. 15 , the noise filter 312 may be provided as an inductor including a core 60 and coils 71 and 72 wound around the core 60 .

The core 60 may provide a path through which magnetic flux or magnetic flux lines generated due to current flowing in the coils 71 and 72 pass.

The coils 71 and 72 may be electrically connected to a power line and a ground line of the power circuit unit 110 provided in the electronic device.

The coils 71 and 72 may be wound to have a predetermined pitch in one region of the core 60 to have a predetermined inductance, and may generate an induced electromotive force based on an amount of change in current supplied from the power line.

The noise filter 312 may include a first coil 71 and a second coil 72 wound to be spaced apart from each other.

In the third embodiment, the core 60, as shown in FIG. 15, includes a main core 61, a sub-core 62, and a balance core 63, and the core 60 is integrally or separated. can be manufactured.

16 shows an example in which the core is integrally implemented in the noise filter according to the third embodiment of the present invention, and FIG. 17 shows another example in which the core is implemented in a combined type in the noise filter according to the third embodiment of the present invention. do.

For example, as shown in FIG. 16 , the noise filter 312 may be manufactured as an integral core 60 that can be divided into a main core 61 , a sub core 62 and a balance core 63 . . As another example, in the noise filter 310 , as shown in FIG. 17 , the main core 61 and the sub-core 62 are manufactured as a single core in the form of a microphone (“ㅁ”), and the balanced core 63 ) may have a shape surrounding the outer periphery at one location of the main core 61 . Here, the balance core 63 may be configured by combining an upper balance core 63a of a “C” shape and a lower balance core 63b of a straight or bar shape.

As shown in FIG. 15 , a first coil 71 and a second coil 72 spaced apart from each other may be wound on the main core 61 . That is, the main core 61 may be provided as a core in which the coils 71 and 72 are wound.

The sub-core 62 may extend from one end of the main core 61 to meet at the other end of the main core 61 .

Specifically, as shown in FIG. 15 , the sub-core 62 extends from one end of the main core 61 to one side, for example, to the right, and a magnetic flux through which the magnetic flux can pass together with the main core 61 . It may have a shape that meets at the other end of the main core 61 to form a closed path.

Accordingly, a first loop through which magnetic flux may be circulated through the main core 61 and the sub-core 62 may be formed.

In the second embodiment of the present invention shown in FIG. 15 , the sub-core 62 has, for example, a digwan (“C”) shape, and can form a closed magnetic path by combining with the main core 61 . there is.

As shown in FIG. 15 , the balance core 63 protrudes in the vertical direction with respect to the main core 61 at one position of the main core 61 between the first coil 71 and the second coil 72 . As such, it may have a shape extending toward the sub-core 62 .

The balance core 63 has a size determined based on a predetermined impedance for noise reduction, for example, a length (h) and a thickness (w), and between the balance core 63 and the sub-core 62 is a balance core ( 63), a gap g may be formed corresponding to the length h.

Accordingly, a second loop through which magnetic flux can be circulated through the main core 61 , the balance core 63 , and the sub-core 62 is formed, and the second loop has an open shape at one side.

The balance core 63 may be manufactured in a “├” shape integrally with the main core 61 as shown in FIG. 15 . However, since this is only an example, the shape of the balance core 63 is not limited to that shown in FIG. 15 . For example, as another example, the balance core 63 may be manufactured in a straight shape (or a rod shape), and may also be combined with the straight main core 61 .

In the third embodiment of the present invention, the balance core 63 may be implemented in a form in which the size, that is, the length (h) and the thickness (w), can be adjusted, respectively.

In one embodiment, the balance core 63 has a size, for example, a length h and a thickness, determined based on an impedance required to reduce noise in the noise filter 312, that is, common mode noise and normal mode noise. (w) can be prepared to have. That is, in the noise filter 312 , the size of the balance core 63 may be adjusted in response to its target impedance.

In the third embodiment, the noise filter 312 removes both the first noise (common mode noise) and the second noise (normal mode noise or differential mode noise) by configuring two magnetic flux paths through the core 60 . It is provided as an integrated hybrid filter that can do this.

As shown in FIG. 15 , the noise filter 312 operates in a common mode in which current flows in the same direction in the first coil 71 and the second coil 72 to generate the first noise (common code). noise) and operates in a normal mode (or differential mode) in which current flows in different directions in the first coil 71 and second coil 72 to operate in a second noise (normal mode noise or differential mode) noise) can be removed.

Basically, since the electronic device has a state in which both the first noise and the second noise are present, the operation of the common mode and the operation of the normal mode are not temporally or spatially separated, and the noise filter ( 312) operates in the common mode and at the same time operates in the normal mode.

In one embodiment, based on the operation of the noise filter 312 in the common mode, if current flows in the same direction in the first coil 71 and the second coil 72 , it is applied to the core 60 by electromagnetic induction. The magnetic flux MF1 may be generated in the first path as in the direction of the arrow.

In the common mode noise filter 312 , as shown in FIG. 15 , a magnetic flux path (first path) through which magnetic flux (magnetic flux line) MF1 passes through the main core 61 and the sub-core 62 is formed. can be For example, in the common mode, the magnetic flux MF1 may form a loop (first loop) in the form of a substantially square ring in which the main core 61 and the sub-core 62 go around.

In the noise filter 312 according to the third embodiment of FIG. 15 , one magnetic flux path is formed from one end of the main core 61 to one side, passing through the sub-core 62 and returning to the other end of the main core 61 . can be

The noise filter 312 may cancel, ie, reduce, the first noise, ie, common mode noise, by the magnetic flux MF1 generated to have the same path as described above.

In the third embodiment, based on the operation of the noise filter 312 in the normal mode, when currents flow in different directions in the first coil 71 and the second coil 72, the core 60 by electromagnetic induction The magnetic flux MF2 may be generated in the second path in the direction of the arrow.

In the noise filter 312 of the normal mode, as shown in FIG. 15 , a magnetic flux path through which a magnetic flux (magnetic flux line) MF2 sequentially passes through the main core 61 , the balance core 63 , and the sub-core 62 . (second path) may be formed.

For example, as shown in FIG. 15 , the magnetic flux in the first direction by the first coil 71 passing through the main core 61 and the magnetic flux in the second direction by the second coil 72 pass through the main core. They repel each other in the central part of 61 , and may branch through the balance core 63 . The magnetic flux MF2 branched through the balance core 63 forms a pair of loops (second loops) in the shape of an approximately square ring that return back to both ends of the main core 61 through the sub-core 62, respectively. can be formed

In the noise filter 312 according to the third embodiment of FIG. 15 , after passing through the balance core 63 at the center of the main core 61 , it passes through both sides of the balance core 63 and the sub-core 62 . Thus, a pair of returning to both ends of the main core 61, that is, two magnetic flux paths may be formed.

The noise filter 312 may cancel, ie, reduce, the second noise, ie, normal mode noise, by the magnetic flux MF2 generated to have the same path as described above.

The noise filter 312 has an impedance (characteristic impedance) determined based on the size of the balance core 63 , that is, the length h and the thickness w. In other words, the impedance of the noise filter 312 may be determined based on the length h and the thickness w of the balance core 63 .

The noise filter 312 according to the third embodiment of FIG. 15, like the noise filter 310 of the first embodiment, has a common mode path as the length (h) or thickness (w) of the balance core 63 increases. is reduced, and as the length (h) or thickness (w) of the balance core 63 decreases, the impedance of the common mode path may increase.

Accordingly, the noise filter 312 may reduce the common mode noise in response to the impedance of the common mode path determined based on the length h and the thickness w of the balance core 63 .

In addition, in the noise filter 312 , the impedance of the normal mode path increases as the length (h) or thickness (w) of the balance core 63 increases, and the length (h) or thickness ( As w) decreases, the impedance of the normal mode path may decrease.

Accordingly, the noise filter 312 may reduce the normal mode noise in response to the impedance of the normal mode path determined based on the length h and the thickness w of the balance core 63 .

In the noise filter 312 according to the third embodiment of the present invention, the size, that is, the length (h) and the thickness (w), is determined based on the impedance required for the balanced core 63 to reduce the common mode noise and the normal mode noise. ) is designed to have In other words, the noise filter 312 can easily reduce common mode noise and normal mode noise by changing the impedance by adjusting the length (h) and thickness (w) of the balance core 63 .

Accordingly, an integrated hybrid noise filter capable of generating impedance required for noise reduction by adjusting the size (size) of the balance core 63 may be provided, thereby having an advantage in manufacturing.

18 is a diagram illustrating a noise filter according to a fourth embodiment of the present invention.

In the noise filter 313 of the fourth embodiment shown in FIG. 18, a protrusion, that is, a protrusion 62a, is further formed on the sub-core 62 of the noise filter 312 of the third embodiment toward the balance core 63. characterized in that

Therefore, in the noise filter 312 of the third embodiment, descriptions of other configurations, operations, etc., except for the protrusions 62a of the sub-core 62, are equally applied to the noise filter 313 of the fourth embodiment, and the third embodiment. Since the configuration having the same name as the noise filter 312 of the example performs the same role in the noise filter 313 of the fourth embodiment, a repeated description will be omitted.

As shown in FIG. 18 , in the noise filter 313 of the fourth embodiment, a protrusion 62a may be formed on the sub-core 62 at a position, for example, from the center toward the balance core 63 . .

Accordingly, as the gap g' between the balance core 43 and the sub-core 42 decreases and the length of the balance core 63 increases (h+h') correspondingly, the impedance of the normal mode path increases. can do. Also, while the noise filter 313 operates in the normal mode, the density of the magnetic flux MF2 generated in the second path may be further improved by the protrusion 62a. 19 is a diagram schematically illustrating a noise filter according to a fifth embodiment of the present invention, and FIG. 20 is a diagram illustrating an example of a magnetic flux path in the noise filter of FIG. 19 .

The noise filter 314 of the fifth embodiment shown in Fig. 19 is different in shape from the noise filter 310 of the first embodiment and the noise filter 312 of the third embodiment, and the noise filter 310 of the first embodiment ) and operates in the same manner as the noise filter 312 of the third embodiment to reduce common mode noise and normal mode noise. Accordingly, the description of the configuration, operation, etc. other than the shape of the noise filter 312 of the first embodiment or the noise filter 312 of the third embodiment is equally applied to the noise filter 312 of the third embodiment, A configuration having the same name as the noise filter 310 of the first embodiment or the noise filter 312 of the third embodiment performs the same role in the noise filter 312 of the fifth embodiment, and thus a redundant description may be omitted. .

In the fifth embodiment, as shown in FIG. 19 , the noise filter 314 may be provided as an inductor including a core 80 and coils 91 and 92 wound around the core 80 .

The core 80 may provide a path through which magnetic flux or magnetic flux lines generated due to current flowing in the coils 91 and 92 pass.

The coils 91 and 92 may be electrically connected to a power line and a ground line of the power circuit unit 110 provided in the electronic device.

The coils 91 and 92 may be wound to have a predetermined pitch in one region of the core 80 to have a predetermined inductance, and may generate an induced electromotive force based on a change amount of current supplied from the power line.

The noise filter 314 may include a first coil 91 and a second coil 92 wound to be spaced apart from each other.

In the fifth embodiment, as shown in FIG. 19 , the core 80 may include a main core 81 , a sub-core 82 , and a balance core 83 .

As shown in FIG. 19 , a first coil 91 and a second coil 92 spaced apart from each other may be wound on the main core 81 . That is, the main core 81 may be provided as a core in which the coils 91 and 92 are wound.

For example, in the fifth embodiment, the main core 81 may be composed of a pair of straight (or rod-shaped) cores arranged in parallel at a predetermined interval.

As shown in FIG. 19 , the sub-core 82 extends from one end of one main core 81 on which the first coil 91 is wound, and the second coil 92 is wound on the second coil 92 . It may be provided to meet the main core (81). That is, as an example, the sub-core 82 is a pair of straight (or bar-shaped) cores arranged in parallel, and the pair of main cores 81 may be connected at the upper and lower sides, respectively.

Accordingly, a first loop through which magnetic flux may be circulated through the main core 81 and the sub-core 82 may be formed.

In the fifth embodiment of the present invention shown in FIG. 19 , the main core 81 and the sub-core 82 coupled to each other may be provided in a rectangular shape to form a closed circuit.

As shown in FIG. 19 , the balance core 83 includes the other sub-core 82 with a predetermined gap g at one position of one sub-core 82, for example, the upper sub-core. , for example, toward the lower sub-core, may be disposed parallel to the main core 81 . That is, the balance core 83 may be disposed in parallel between the pair of main cores 81 .

The balance core 83 may have a size determined based on a predetermined impedance for noise reduction, for example, a length h and a thickness w.

A gap g may be formed between the balance core 83 and the sub-core 82 to correspond to the length h of the balance core 83 .

Accordingly, a second loop through which magnetic flux can be circulated through the main core 81 , the balance core 83 , and the sub-core 82 is formed, and the second loop has a partially opened shape.

The balance core 83, for example, as shown in FIG. 19, may be manufactured in a straight shape (“one” shape) or a rod shape. However, since this is only an example, the shape of the balance core 83 is not limited to that shown in FIG. 19 .

For example, in FIG. 19 , the balance core 83 is shown to form a gap g with both the upper and lower sub-cores 82 , but in some cases, the balance core 83 is provided with the upper sub-core 82 . ) and may be manufactured in a state connected to any one of the lower sub-cores.

In the third embodiment of the present invention, the balance core 83 may be implemented in a form in which the size, that is, the length (h) and the thickness (w), can be adjusted, respectively.

In one embodiment, the balance core 83 has a size determined based on the impedance required to reduce noise in the noise filter 314, that is, common mode noise and normal mode noise, for example, length (h) and thickness. (w) can be prepared to have. That is, in the noise filter 312 , the size of the balance core 83 may be adjusted in response to its target impedance.

In the third embodiment, the noise filter 314 removes both the first noise (common mode noise) and the second noise (normal mode noise or differential mode noise) by configuring two magnetic flux paths through the core 80 . It is provided as an integrated hybrid filter that can do this.

As shown in FIG. 20 , the noise filter 314 operates in a common mode in which current flows in the same direction in the first coil 91 and the second coil 92 to generate the first noise (common code). noise) and operate in a normal mode (or differential mode) in which current flows in different directions in the first and second coils 91 and 92 to operate in a second noise (normal mode noise or differential mode). noise) can be removed.

Basically, since the electronic device has a state in which both the first noise and the second noise are present, the operation of the common mode and the operation of the normal mode are not temporally or spatially separated, and the noise filter ( 310) operates in the common mode and at the same time operates in the normal mode.

In one embodiment, based on the operation of the noise filter 314 in the common mode, if the current flows in the same direction in the first coil 91 and the second coil 92, the noise filter 314 is applied to the core 80 by electromagnetic induction. The magnetic flux MF1 may be generated in the first path as in the direction of the arrow.

In the common mode noise filter 314, as shown in FIG. 20, a magnetic flux path (first path) through which magnetic flux (magnetic flux line) MF1 passes through the main core 81 and the sub-core 82 is formed. can be For example, in the common mode, the magnetic flux MF1 may form one loop (the first loop) in the form of an approximately square ring that circles the main core 81 and the sub-core 82 .

In the noise filter 314 according to the fifth embodiment of FIG. 20 , one end of one main core 81 , for example, a second coil 92 is wound from the lower end of the main core 81 to one side. One end of the other main core 81 passing through any one sub-core 82, for example, a first coil 91 is connected to the lower end of the wound main core 81, and the other main core 81 The other end of the, for example, the first coil 91 passes from the upper end of the main core 81 to one side through the other sub-core 82, and again the other end of the first main core 81, for example, One magnetic flux path returning to the upper end of the main core 81 on which the second coil 92 is wound may be formed.

The noise filter 314 may cancel, ie, reduce, the first noise, ie, common mode noise, by the magnetic flux MF1 generated to have the same path as described above.

In the fifth embodiment, based on the operation of the noise filter 314 in the normal mode, when current flows in different directions in the first coil 91 and the second coil 92, the core 80 by electromagnetic induction The magnetic flux MF2 may be generated in the second path in the direction of the arrow.

In the noise filter 314 of the normal mode, as shown in FIG. 20 , a magnetic flux path through which the magnetic flux (magnetic flux line) MF2 sequentially passes through the main core 81 , the sub-core 82 and the balance core 83 . (second path) may be formed.

For example, as shown in FIG. 20 , the magnetic flux in the first direction by the first coil 91 and the magnetic flux in the second direction by the second coil 92 passing through the main cores 81 on both sides. The sub-core 82, for example, in the central portion of the lower sub-core 82 may repel each other and branch through the balance core 83 . Each of the magnetic fluxes MF2 branched through the balance core 83 is a sub-core 82, for example, a substantially rectangular ring that returns to the other end of the main core 81 through the sub-core 82 at the top. A pair of loops (second loop) of the shape may be formed.

In the noise filter 314 according to the fifth embodiment of FIG. 20, one end of the pair of main cores 81 passes through the center of the sub-core 82 and the balance core 83, and then the sub-core again. A pair of passing through 82 and returning to the other end of the main core 81, that is, two magnetic flux paths may be formed.

The noise filter 314 may cancel, ie, reduce, the second noise, ie, normal mode noise, by the magnetic flux MF2 generated to have the same path as described above.

The noise filter 314 has an impedance (characteristic impedance) determined based on the size of the balance core 83 , that is, the length h and the thickness w. In other words, the impedance of the noise filter 312 may be determined based on the length h and the thickness w of the balance core 83 .

The noise filter 314 according to the fifth embodiment of FIGS. 19 and 20, like the noise filter 310 of the first embodiment and the noise filter 312 of the third embodiment, has a length h of the balance core 83. ) or as the thickness w increases, the impedance of the common mode path may decrease, and as the length h or thickness w of the balance core 83 decreases, the impedance of the common mode path may increase.

Accordingly, the noise filter 314 may reduce the common mode noise in response to the impedance of the common mode path determined based on the length h and the thickness w of the balance core 83 .

In addition, in the noise filter 314 , the impedance of the normal mode path increases as the length (h) or thickness (w) of the balance core 83 increases, and the length (h) or thickness (h) of the balance core 83 ( As w) decreases, the impedance of the normal mode path may decrease.

Accordingly, the noise filter 314 may reduce the normal mode noise in response to the impedance of the normal mode path determined based on the length h and the thickness w of the balance core 83 .

In the noise filter 314 according to the fifth embodiment of the present invention, the size of the balanced core 83 is determined based on the impedance required to reduce the common mode noise and the normal mode noise, that is, the length (h) and the thickness (w). ) is designed to have In other words, the noise filter 314 can easily reduce common mode noise and normal mode noise by changing the impedance by adjusting the length (h) and thickness (w) of the balance core 83 .

Accordingly, an integrated hybrid noise filter capable of generating an impedance required for noise reduction by adjusting the size (size) of the balance core 83 is provided, thereby providing an advantage in manufacturing.

21 is a diagram illustrating a noise filter according to a sixth embodiment of the present invention.

The noise filter 315 of the sixth embodiment shown in FIG. 21 is different from the noise filter 314 of the fifth embodiment in the shape of the balance core 83 .

Accordingly, descriptions of the configuration and operation of the noise filter 315 of the sixth embodiment except for the balance core 83 are equally applied to the noise filter 314 of the fifth embodiment, and the noise filter 314 of the fifth embodiment. ) and a configuration having the same name as the noise filter 315 of the sixth embodiment also performs the same role, so a repeated description will be omitted.

21, in the noise filter 315 of the sixth embodiment, the balance core 83 is composed of a first balance core 83a and a second balance core 83b.

The first and second balance cores 83a and 83b are a pair of rod-shaped cores extending toward each other at a position, for example, at a central portion of each of the pair of sub-cores 82 arranged in parallel up and down. can be implemented as

As shown in FIG. 21 , the first and second balance cores 83a and 83b may be arranged in a line parallel to the main core 81 with a predetermined gap g.

In the noise filter 315 according to the sixth embodiment, the first and second balance cores 83a and 83b each have a size determined based on a predetermined impedance for noise reduction, for example, lengths h1 and h2, and It may have a thickness (w). Here, the gap between the first and second balance cores 83a and 83b corresponds to the total length (h=h1+h2) of the balance core 83 including the first and second balance cores 83a and 83b.

The first and second balance cores 83a and 83b may be implemented in a form in which the size, that is, the lengths h1 and h2 and the thickness w, can be adjusted, respectively.

22 is a diagram illustrating a noise filter according to a seventh embodiment of the present invention.

The noise filter 316 of the seventh embodiment shown in FIG. 22 is compared with the noise filter 315 of the sixth embodiment, the first and second balanced cores 83c and 83d constituting the balance core 83 are They are designed with different lengths.

Therefore, in the noise filter 316 of the seventh embodiment, the description of the configuration and operation other than the balance core 83 is equally applied to the noise filter 314 of the fifth embodiment and the noise filter 315 of the sixth embodiment. The configuration having the same name as the noise filter 314 of the fifth embodiment and the noise filter 315 of the sixth embodiment performs the same role in the noise filter 316 of the seventh embodiment, and thus repeated descriptions will be omitted. do it with

22, in the noise filter 316 of the seventh embodiment, the balance core 83 is composed of a first balance core 83c and a second balance core 83d.

The first and second balance cores 83c and 83d extend toward each other at a position, for example, the central portion of each of the pair of sub-cores 82 arranged in parallel up and down, and a pair of different lengths from each other. It can be implemented as the core of

As shown in FIG. 22 , the first and second balance cores 83c and 83d may be arranged in a line parallel to the main core 81 with a predetermined gap g.

In the noise filter 316 according to the seventh embodiment, the first and second balance cores 83c and 83d each have a size determined based on a predetermined impedance for noise reduction, for example, lengths h3 and h4, and It may have a thickness (w). Here, the gap g between the first and second balance cores 83c and 83d is the total length (h = h3 + h4) of the balance core 83 composed of the first and second balance cores 83c and 83d. respond

In the seventh embodiment, the core 60 includes a main core 81 , a sub-core 82 , and first and second balance cores 83a and 83b, and the core 60 is manufactured in an integral or separate type. can be

23 shows an example in which the core is implemented as a coupling type in the noise filter according to the seventh embodiment of the present invention.

For example, in the noise filter 316, as shown in FIG. 23, the main core 81 and the sub-core 82 are in the form of a microphone (“ㅁ”), as a first balanced core 83c on the upper part. It may be made of a single core with protrusions formed on the inside, and may be configured in combination with the rod-shaped second balance core 83c.

24 is a circuit diagram of a related art in which a plurality of noise filters are provided as an example, and FIG. 25 is an example of a circuit diagram in which an integrated noise filter is provided according to an embodiment of the present invention.

24 , as a common mode noise filter in the related art, a structure of a two-stage filter combining two noise filters may be applied, and a capacitor X_cap may be disposed in parallel between the two noise filters.

Since each filter is individually manufactured and mounted on the power board, these two-stage noise filters require a lot of installation space, and the size and number of components may increase. Accordingly, the structure is complicated, the manufacturing cost increases, and the miniaturization of the electronic device and the power board may be limited.

On the other hand, in the embodiments of the present invention, as shown in FIG. 25 , the noise filter 310 is implemented as an integrated hybrid filter, thereby reducing manufacturing costs and facilitating slimming and miniaturization of electronic devices and power boards. There is this.

As described above, the noise filters 310 , 311 , 312 , 313 , 314 , 315 , and 316 according to the embodiments of the present invention are included in the power circuit unit 110 of the electronic device, or are located in front of the power circuit unit 110 . It can be added as a separate configuration. However, since the embodiment of the present invention is not limited to the above, for example, the noise filters 310 , 311 , 312 , 313 , 314 , 315 , 316 are provided in the adapter for supplying power to the electronic device. case will be included in the present invention.

26 is a block diagram illustrating a configuration of an electronic device including a noise filter according to an embodiment of the present invention.

The electronic device 10 according to an embodiment of the present invention has a noise filter (EMI) capable of suppressing EMI noise generated from the power circuit unit 110 , that is, common mode noise (C) and normal mode noise (N). filter) may be implemented as a provided device.

26 , the electronic device 10 may include a power circuit unit 110 .

The power circuit unit 110 may be provided on a power board (power board).

The power circuit unit 110 may supply operating power and/or standby power to each component (load) of the electronic device 10 .

In an embodiment, the power circuit unit 110 may include a switched mode power supply including a switch element performing an on/off switching operation, that is, a switched mode power supply (SMPS).

In an embodiment, the power circuit unit 110 may convert power input from the outside to be supplied to each component of the electronic device 10 , and may include, for example, an AC/DC converter.

In an embodiment, the power circuit unit 110 may include a noise filter for suppressing EMI noise. Here, the noise filter is an integrated hybrid filter that reduces the first noise (common mode noise) and the second noise (normal mode noise), and the noise filters 310, 311, and 312 according to the first to third embodiments of the present invention. ) can be implemented in any one of the

The electronic device 10 may include a display 120 .

In an embodiment, the display 120 may be included in a functional unit (also referred to as an operation performing unit or an operating unit) provided as a load ( 210 in FIG. 1 ) capable of receiving power and performing an operation or function.

The functional unit may include an electronic device as a configuration provided to perform a function of the electronic device 10 , that is, an operation. The functional unit includes, for example, the display 120 , a driving unit capable of driving the display 120 , and a processor 150 provided to control the operation or function of the electronic device 10 , and in the present invention The type of the electronic device is not limited. That is, various components provided as the load 210 that consumes power in the electronic device 10 may be included in the functional unit.

The electronic device 10 according to an embodiment of the present invention may process data of content received from an external signal supply source, that is, a source or stored therein, to be displayed as an image on the display 120 .

In an embodiment, the electronic device 10 implemented as a display device may be implemented as a television (TV) capable of processing a broadcast image based on at least one of a broadcast signal received from a transmission device of a broadcast station, broadcast information, or broadcast data. can In this case, the electronic device 10 may be provided with a tuner for tuning the broadcast signal for each channel.

However, the spirit of the present invention is not limited to the above implementation examples. As another embodiment, the electronic device 10 is an image processing device such as a set-top box that transmits a signal to an external display connected by wire or wirelessly. may be implemented. As another embodiment, the electronic device 10 includes a terminal apparatus (hereinafter, referred to as a user terminal) provided with a display such as a smart pad such as a smart phone or a tablet. Alternatively, it may be implemented as a user device). As another embodiment, the electronic device 10 may also be applied to a monitor of a personal computer (PC) such as a desktop or a laptop.

When the electronic device 10 is a television, the electronic device 10 is an additional device that can be directly or connected to the electronic device 10 by a cable, for example, a set-top box (STB), an OC box. It is possible to receive broadcast content based on at least one of a broadcast signal received from a transmission device of a broadcast station, broadcast information, or broadcast data through a one-connect box, a media box, or the like. Here, the connection method between the electronic device 10 and the additional device is not limited to the cable, and various wired/wireless interfaces may be applied.

The electronic device 10 may wirelessly receive, for example, a radio frequency (RF) signal transmitted from a broadcasting station, that is, broadcast content, and for this purpose, the electronic device 10 is provided with an antenna capable of receiving the broadcast signal can be

In the electronic device 10 , broadcast content may be received through terrestrial waves, cables, satellites, or the like, and a signal source, ie, a source, is not limited to a broadcasting station. In other words, any device or station capable of transmitting and receiving data may be included in the source of the present invention.

The standard of the signal received by the electronic device 10 may be configured in various ways in response to the implementation form of the device, and the electronic device 10 corresponds to the implementation form of the interface unit 130 to be described later, and thus HDMI (High Definition Multimedia Interface), HDMI-CFC (Consumer Electronics Control), display port (DP), DVI, composite video, component video, super video, DVI (Digital Visual Interface) , Thunderbolt, RGB cable, SCART (Syndicat des Constructeurs d'Appareils Radiorιcepteurs et Tιlιviseurs), USB (universal serial bus) signals corresponding to standards such as video content can be received by wire.

The electronic device 10 includes a user interface (UI) for controlling a video, a still image, an application, an on-screen display (OSD), and various operations based on signals/data stored in internal/external storage media. The signal can be processed to display the light on the screen.

As a source for providing content, the electronic device 10 may receive content from various external devices including a server and a terminal device through wired or wireless network communication, and the type of communication is not limited.

Specifically, the electronic device 10 corresponds to an implementation form of the interface unit 130 to be described later, such as Wi-Fi, Wi-Fi Direct, Bluetooth, and Bluetooth low energy. , Zigbee (Zigbee), UWB (Ultra-Wideband), NFC (Near Field Communication), such as a signal corresponding to the standard may be received as video content through wireless network communication. Also, the electronic device 10 may receive a content signal through wired network communication such as Ethernet.

In an embodiment, the electronic device 10 may be implemented as a smart TV or Internet Protocol TV (IP TV). A smart TV can receive and display broadcast signals in real time, and has a web browsing function, so it is possible to display real-time broadcast signals and to search and consume various contents through the Internet at the same time, and to provide a convenient user environment for this. am. In addition, since the smart TV includes an open software platform, it can provide interactive services to users. Accordingly, the smart TV can provide a user with various contents, for example, the contents of an application providing a predetermined service through an open software platform. These applications are applications that can provide various types of services, and include, for example, applications that provide services such as SNS, finance, news, weather, maps, music, movies, games, and e-books.

The implementation method of the display 120 is not limited, and for example, liquid crystal, plasma, light-emitting diode, organic light-emitting diode, surface conduction electron gun ( It can be implemented in various display methods such as surface-conduction electron-emitter), carbon nano-tube, and nano-crystal.

In an embodiment, the display 120 includes a display panel that displays an image, and may further include an additional component, for example, a driver according to an implementation method thereof.

The electronic device 10 may include an interface unit 130 .

The interface unit 130 allows the electronic device 10 to communicate with various external devices including a server.

The interface unit 130 may include a wired interface unit 131 . The wired interface unit 131 includes a connection unit for transmitting/receiving signals/data according to standards such as HDMI, HDMI-CFC, USB, Component, Display Port (DP), DVI, Thunderbolt, RGB cable, etc. can Here, the wired interface unit 131 may include at least one connector, terminal, or port corresponding to each of these standards.

The wired interface unit 131 may be implemented in a form including an input port for receiving a signal from a source or the like, and may further include an output port in some cases to transmit/receive signals in both directions.

The wired interface unit 131 is configured to connect an antenna capable of receiving a broadcast signal according to a broadcasting standard such as terrestrial/satellite broadcasting, or a cable capable of receiving a broadcast signal according to the cable broadcasting standard to be connected, an HDMI port, a DisplayPort , DVI port, Thunderbolt, composite video, component video, super video, SCART, etc., may include a connector or port according to the video and / or audio transmission standard, and the like. As another example, the electronic device 10 may have a built-in antenna capable of receiving a broadcast signal.

When the video/audio signal received through the interface unit 130 is a broadcast signal, the electronic device 10 may further include a tuner for tuning the received broadcast signal for each channel. The tuner may include a demodulator that demodulates a broadcast signal of a tuned specific channel and outputs a signal in the form of a transport stream (TS). In other words, the tuner and the demodulator may be designed as a single integrated chip, or may be implemented as two separate chips.

The wired interface unit 131 may include a connector or port according to a universal data transmission standard such as a USB port. The wired interface unit 131 may include a connector or a port to which an optical cable can be connected according to an optical transmission standard. The wired interface unit 131 is connected to an external microphone or an external audio device having a microphone, and may include a connector or port capable of receiving or inputting an audio signal from the microphone or the audio device. The wired interface unit 131 is connected to an audio device such as a headset, earphone, or external speaker, and may include a connector or port capable of transmitting or outputting an audio signal to the audio device. The wired interface unit 131 may include a connector or port according to a network transmission standard such as Ethernet. For example, the wired interface unit 131 may be implemented as a LAN card connected to a router or a gateway by wire.

The wired interface unit 131 is connected to an external device, such as a set-top box, an optical media player, or an external display device, speaker, server, etc. through a connector or port in a 1:1 or 1:N (N is a natural number) method wired connection. As a result, the video/audio signal is received from the corresponding external device or the video/audio signal is transmitted to the corresponding external device. The wired interface unit 131 may include a connector or port for separately transmitting video/audio signals.

The wired interface unit 131 may be implemented as a communication circuitry including a wireless communication module (S/W module, chip, etc.) corresponding to various types of communication protocols.

In an embodiment, the wired interface unit 131 is embedded in the electronic device 10 , but may be implemented in the form of a dongle or a module to be detachably attached to the connector of the electronic device 10 .

The interface unit 130 may include a wireless interface unit 132 .

The wireless interface unit 132 may be implemented in various ways corresponding to the implementation form of the electronic device 10 . For example, the wireless interface unit 132 is a communication method RF (radio frequency), Zigbee (Zigbee), Bluetooth (bluetooth), Wi-Fi (Wi-Fi), UWB (Ultra WideBand) and NFC (Near Field Communication), etc. Wireless communication can be used.

The wireless interface unit 132 may be implemented as a communication circuitry including a wireless communication module (S/W module, chip, etc.) corresponding to various types of communication protocols.

In an embodiment, the wireless interface unit 132 includes a wireless LAN unit. The wireless LAN unit may be wirelessly connected to an external device through an access point (AP) under the control of the processor 150 . The wireless LAN unit includes a WiFi module.

In an embodiment, the wireless interface unit 132 includes a wireless communication module that wirelessly supports one-to-one direct communication between the electronic device 10 and an external device without an access point. The wireless communication module may be implemented to support communication methods such as Wi-Fi Direct, Bluetooth, and Bluetooth low energy. When the electronic device 10 directly communicates with the external device, the storage unit 140 may store identification information (eg, MAC address or IP address) on the external device, which is a communication target device.

In the electronic device 10 according to an embodiment of the present invention, the wireless interface unit 132 is provided to perform wireless communication with an external device by at least one of a wireless LAN unit and a wireless communication module according to performance.

In another embodiment, the air interface unit 132 may further include a communication module using various communication methods such as mobile communication such as LTE, EM communication including a magnetic field, and visible light communication.

The wireless interface unit 132 may transmit and receive data packets to and from the external device by wirelessly communicating with an external device such as the server 20 on a network.

The wireless interface unit 132 may include an IR transmitter and/or an IR receiver capable of transmitting and/or receiving an IR (Infrared) signal according to an infrared communication standard. The wireless interface unit 132 may receive or input a remote control signal from the remote control or other external device through the IR transmitter and/or the IR receiver, or transmit or output a remote control signal to another external device. As another example, the electronic device 10 may transmit/receive a remote control signal to and from the remote control or other external device through the wireless interface unit 132 of another method such as Wi-Fi or Bluetooth.

In an embodiment, the wireless interface unit 132 may transmit predetermined data as information of a user's voice received through a voice input unit such as a microphone to an external device such as a server. Here, the form/type of the transmitted data is not limited, and for example, an audio signal corresponding to a voice uttered by a user or a voice characteristic extracted from the audio signal may be included.

Also, the wireless interface unit 132 may receive data of the processing result of the user's voice from an external device such as a server. The electronic device 10 may output a sound corresponding to the voice processing result through an internal or external loudspeaker based on the received data.

However, the above-described embodiment is an example, and the user's voice may be processed by itself within the electronic device 10 without transmitting the user's voice to the server. That is, in another embodiment, the electronic device 10 may be implemented to perform the role of a speech to text (STT) server.

The electronic device 10 may communicate with an input device such as a remote control through the wireless interface unit 132 to receive a sound signal corresponding to a user voice from the input device.

In the electronic device 10 according to an embodiment, a communication module for communicating with an external device such as the server 20 and a communication module for communicating with the remote controller may be different from each other. For example, the electronic device 10 may communicate with an external device through an Ethernet modem or Wi-Fi module, and may communicate with a remote controller and a Bluetooth module.

In the electronic device 10 according to another embodiment, the communication module for communicating with an external device such as the server 20 and the communication module for communicating with the remote control may be the same. For example, the electronic device 10 may communicate with an external device and a remote controller through a Bluetooth module.

In an embodiment, the wireless interface unit 132 is embedded in the electronic device 10 , but may be implemented in the form of a dongle or a module to be detachably attached to a connector of the electronic device 10 .

The electronic device 10 may include a storage unit 140 .

The storage unit 140 is configured to store various data of the electronic device 10 .

The storage unit 140 may retain data even if the power supplied to the electronic device 10 is cut off, and may be provided as a writable nonvolatile memory (writable ROM) to reflect changes. That is, the storage unit 140 may be provided with any one of a flash memory, an EPROM, or an EEPROM. The storage unit 140 may further include a volatile memory such as DRAM or SRAM, in which the read or write speed of the electronic device 10 is faster than that of the nonvolatile memory.

The data stored in the storage unit 140 includes, for example, an operating system for driving the electronic device 10 , and various programs, applications, image data, and additional data executable on the operating system.

Specifically, the storage unit 140 may store signals or data input/output corresponding to the operation of each component under the control of the processor 150 . The storage unit 140 includes a control program for controlling the electronic device 10, a UI related to an application provided by a manufacturer or downloaded from outside, a graphic or image for providing the UI, user information, documents, databases, or related data. can be saved

In an embodiment of the present invention, the term "storage unit" refers to a storage unit 140, a ROM (not shown) in the processor 150, a RAM (not shown), or mountable in the electronic device 10 . It is defined as including a memory card (not shown) (eg, micro SD card, memory stick).

The electronic device 10 may include a processor 150 .

The processor 150 controls all components of the electronic device 10 to operate. The processor 150 includes a control program (or instructions) for performing such a control operation, a non-volatile memory in which the control program is installed, a volatile memory in which at least a part of the installed control program is loaded, and the loaded control program. It may include at least one general-purpose processor that executes, for example, a microprocessor, an application processor, or a central processing unit (CPU).

The processor 150 may include a single core, a dual core, a triple core, a quad core, and multiple cores thereof. The processor 150 includes a plurality of processors, for example, a main processor and a sub processor operating in a sleep mode (eg, only standby power is supplied and does not operate as a display device). ) may be included. In addition, the processor, ROM, and RAM may be interconnected through an internal bus.

In an embodiment, the processor 150 may be implemented in a form included in a main SoC mounted on a PCB embedded in the electronic device 10 .

The control program may include program(s) implemented in the form of at least one of a BIOS, a device driver, an operating system, firmware, a platform, and an application. As an embodiment, the application is pre-installed or stored in the electronic device 10 when the electronic device 10 is manufactured, or receives data of the application from the outside when used later, based on the received data. (10) can be installed. Data of the application may be downloaded to the electronic device 10 from, for example, an external server such as an application market. Such an external server is an example of the computer program product of the present invention, but is not limited thereto.

The control program may be recorded in a storage medium readable by a device such as a computer. The device-readable storage medium may be provided in the form of a non-transitory storage medium or a non-volatile storage medium. Here, 'non-transitory storage medium' is a tangible device and only means that it does not contain a signal (eg, electromagnetic wave). It does not distinguish the case where it is stored as For example, the 'non-transitory storage medium' may include a buffer in which data is temporarily stored.

According to an embodiment, the method according to various embodiments disclosed in this document may be included and provided in a computer program product. Computer program products may be traded between sellers and buyers as commodities. The computer program product is distributed in the form of a device-readable storage medium (eg compact disc read only memory (CD-ROM)), or through an application store (eg Play Store™) or on two user devices (eg, It can be distributed online (eg download or upload), directly between smartphones (eg smartphones). In the case of online distribution, at least a portion of the computer program product (eg, a downloadable app) is stored at least on a machine-readable storage medium, such as a memory of a manufacturer's server, a server of an application store, or a relay server. It may be temporarily stored or temporarily created.

As mentioned above, although the present invention has been described in detail through preferred embodiments, the present invention is not limited thereto and may be practiced in various ways within the scope of the claims.

100: electronic device
110: power circuit unit
310, 311, 312, 313, 314, 315, 316: noise filter
40, 41, 42, 43: core
51, 52: coil

Claims (20)

In an electronic device,
Includes a power circuit unit including a noise filter for removing noise generated during power supply,
The noise filter includes a core, and first and second coils wound around the core,
The core is
a main core on which the first coil and the second coil are wound while being spaced apart from each other;
a sub-core extending from one end of the main core to one or both sides and provided to meet at the other end of the main core to form a closed path through which magnetic flux can pass together with the main core;
a balance core provided to protrude in a vertical direction with respect to the main core at a position of the main core between the first coil and the second coil;
The balance core has a size determined based on an impedance for reducing a first noise due to a current flowing in the same direction to the power line of the power circuit unit and a second noise due to a current flowing in a different direction to the power line. electronics. According to claim 1,
The size of the electronic device includes at least one of a length and a thickness of the balance core. 3. The method of claim 2,
An electronic device in which a gap is provided between the sub-core and the balance core to correspond to the length of the balance core. According to claim 1,
The noise filter is
reducing the first noise by a magnetic flux generated by a current flowing in the same direction in the first coil and the second coil;
An electronic device for reducing the second noise by a magnetic flux generated by currents flowing in different directions in the first coil and the second coil. 5. The method of claim 4,
The noise filter is
To reduce the first noise by the magnetic flux passing through the first path through the main core and the sub-core,
An electronic device for reducing the second noise by a magnetic flux sequentially passing through a second path through the main core, the balance core, and the sub-core. 6. The method of claim 5,
The impedance of the first path through which the magnetic flux for reducing the first noise passes is inversely proportional to the size of the balance core. 6. The method of claim 5,
The impedance of the second path through which the magnetic flux for reducing the second noise passes is proportional to the size of the balance core. 6. The method of claim 5,
The second path is
The magnetic flux in the first direction by the first coil and the magnetic flux in the second direction by the second coil repel each other in the central part of the main core and branch to both sides through the balance core, and the branched magnetic flux is divided into the sub An electronic device that forms a loop returning to both ends of the main core through the core. 9. The method of claim 8,
The second path forms an open loop at one side of the electronic device. 6. The method of claim 5,
The first path is
An electronic device for forming a loop from one end of the main core passing through the sub-core and returning to the other end of the main core. In an electronic device,
Includes a power circuit unit including a noise filter for removing noise generated during power supply,
The noise filter includes a core, and first and second coils wound around the core,
The core is
a pair of main cores arranged in parallel at a predetermined interval and wound around the first coil and the second coil, respectively;
a pair of sub-cores respectively connecting the pair of main cores at upper and lower portions;
a balance core disposed parallel to the main core from one position of one sub-core of the pair of sub-cores toward the other sub-core;
The balance core has a size determined based on an impedance for reducing a first noise due to a current flowing in the same direction to the power line of the power circuit unit and a second noise due to a current flowing in a different direction to the power line. electronics. 12. The method of claim 11,
The size of the electronic device includes at least one of a length and a thickness of the balance core. 12. The method of claim 11,
The noise filter is
reducing the first noise by a magnetic flux generated by a current flowing in the same direction in the first coil and the second coil;
An electronic device for reducing the second noise by a magnetic flux generated by currents flowing in different directions in the first coil and the second coil. 14. The method of claim 13,
An impedance of a first path of magnetic flux for reducing the first noise is inversely proportional to a size of the balance core. 14. The method of claim 13,
The impedance of the second path of the magnetic flux for reducing the second noise is proportional to the size of the balance core. 16. The method of claim 15,
The second path is
The magnetic flux in the first direction by the first coil and the magnetic flux in the second direction by the second coil repel each other in the central part of the sub-core, pass through the balance core, and return to the main core through the sub-core. Electronic devices, some of which form an open loop. A noise filter for removing noise generated when power is supplied to an electronic device, the noise filter comprising:
A core and a first coil and a second coil wound around the core,
The core is
a main core on which the first coil and the second coil are wound while being spaced apart from each other;
a sub-core extending from one end of the main core to one or both sides and provided to meet at the other end of the main core to form a closed path through which magnetic flux can pass together with the main core;
a balance core provided to protrude in a vertical direction with respect to the main core at a position of the main core between the first coil and the second coil;
The balance core is determined based on an impedance for reducing a first noise due to a current flowing in the same direction to a power line of the power circuit unit of the electronic device and a second noise due to a current flowing in a different direction to the power line. A noise filter with size. 18. The method of claim 17,
reducing the first noise by a magnetic flux generated by a current flowing in the same direction in the first coil and the second coil;
A noise filter for reducing the second noise by magnetic flux generated by currents flowing in different directions in the first coil and the second coil. 19. The method of claim 18,
To reduce the first noise by the magnetic flux passing through the first path through the main core and the sub-core,
A noise filter for reducing the second noise by a magnetic flux sequentially passing through a second path through the main core, the balance core, and the sub-core. 20. The method of claim 19,
The impedance of the first path of the magnetic flux for reducing the first noise is inversely proportional to the size of the balance core,
The impedance of the second path of the magnetic flux for reducing the second noise is proportional to the size of the balance core.

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