CN104539148A - Filter circuit and device - Google Patents
Filter circuit and device Download PDFInfo
- Publication number
- CN104539148A CN104539148A CN201410699003.9A CN201410699003A CN104539148A CN 104539148 A CN104539148 A CN 104539148A CN 201410699003 A CN201410699003 A CN 201410699003A CN 104539148 A CN104539148 A CN 104539148A
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- Prior art keywords
- circuit
- filter
- filter capacitor
- winding
- inductor
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/24—Magnetic cores
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/24—Magnetic cores
- H01F27/26—Fastening parts of the core together; Fastening or mounting the core on casing or support
- H01F27/263—Fastening parts of the core together
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/30—Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/12—Arrangements for reducing harmonics from ac input or output
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0038—Circuits or arrangements for suppressing, e.g. by masking incorrect turn-on or turn-off signals, e.g. due to current spikes in current mode control
Abstract
The invention discloses a filter circuit and device. The filter circuit is composed of discrete components. The filter circuit and device can inhibit interference signals at the input and output of a switching power supply, the anti-interference capability is improved, the circuit can be highly integrated, the occupied area of a printed circuit board is small, employed devices are fewer, the production cost is effectively reduced, and the competitiveness of products is improved.
Description
Technical field
The present invention relates to filter circuit field, particularly relate to a kind of filter circuit and device.
Background technology
Along with the high speed development of power electronic technology, the work of power electronic equipment and people, the relation of life are day by day close, and electronic equipment all be unable to do without reliable power supply.In order to obtain reliable and stable power supply supply, Switching Power Supply is arisen at the historic moment, and is more and more commonly used in each supply of electric power.
But in Switching Power Supply, because circuit working is on off state, inevitably produce the electromagnetic interference signal such as common mode interference signal and differential mode interference signal, these interference signals not only affect the normal work of circuit, are also affected the normal work of other electrical equipment by the mode of radiation or conduction.Meanwhile, in the process of switching circuit work, the external world also can produce the normal operation that electromagnetic interference signal affects circuit, such as: thunderbolt interference.This brings impact all to the operation of equipment, also brings inconvenience to user.，
At present, the electromagnetic interference signal such as common mode interference signal and differential mode interference signal is produced in order to suppress circuit, and improve the ability of other interference signals of opposing impact, discrete common-mode circuit, differential mode circuit and the anti-jamming circuit of usual employing carries out combining the filter circuit needed for obtaining, but, owing to being adopt discrete circuit to combine, this will cause the large waste circuit board space of the printed circuit board area shared by circuit, and device too much causes cost high.
Summary of the invention
Embodiment of the present invention technical problem to be solved is, provides a kind of filter circuit and device, can carry out suppression interference signal to the input and output of Switching Power Supply, and reduces circuit and take printed circuit board area, reduces production cost.
First aspect present invention provides a kind of filter circuit, and described circuit is connected with load, and described circuit comprises power supply, inductor and the first filter circuit, wherein,
Described inductor comprises magnetic core, the first winding and the second winding, and described magnetic core comprises toroidal magnet and magnetic post, and described magnetic post is arranged in the inner ring that described toroidal magnet surrounds, and the two ends of described magnetic post are connected with described toroidal magnet respectively;
One end of first winding of described inductor is connected with the positive pole of described power supply, one end of second winding of described inductor is connected with the negative pole of described power supply, the other end of the first winding of described inductor is connected with one end of described first filter circuit, the other end of the second winding of described inductor is connected with the other end of described first filter circuit, the another end ground connection of described first filter circuit;
Described first filter circuit two ends are connected with described load two ends.
In the first mode in the cards, described circuit comprises:
Current sink circuit;
One end of described current sink circuit is connected with the positive pole of described power supply, and the other end of described current sink circuit is connected with the negative pole of described power supply.
In conjunction with the first possible implementation of first aspect or first aspect, in the implementation that the second is possible, described circuit also comprises:
Second filter circuit;
Second filter circuit;
One end of described second filter circuit is connected with one end of described first winding, and the other end of described second filter circuit is connected with one end of described second winding, the another end ground connection of described second filter circuit.
In conjunction with first aspect or the first possible implementation of first aspect or the possible implementation of the second of first aspect, in the implementation that the third is possible, the preset position of described magnetic post is provided with air gap.
In conjunction with the third possible implementation of first aspect or the first possible implementation of first aspect or the possible implementation of the second of first aspect or first aspect, in the 4th kind of possible implementation, the junction of described magnetic post and described toroidal magnet is provided with air gap, described air gap place is provided with sealing joint strip, and described sealing joint strip to be arranged in described air gap and to be full of by described air gap.
In conjunction with first aspect or the first possible implementation of first aspect or the possible implementation of the second of first aspect or the third possible implementation of first aspect or the 4th kind of possible implementation of first aspect, in the 5th kind of possible implementation, described first filter circuit comprises:
First filter capacitor, the second filter capacitor and the 3rd filter capacitor;
One end of described first filter capacitor is connected with the other end of described first winding, the other end ground connection of described first filter capacitor;
One end of described second filter capacitor is connected with the other end of described second winding, the other end ground connection of described second filter capacitor;
One end of described 3rd filter capacitor is connected with the other end of described first winding, and the other end of described 3rd filter capacitor is connected with the other end of described second winding.
In conjunction with the implementation that the second of first aspect is possible, in the 6th kind of possible implementation, described second filter circuit comprises:
4th filter capacitor, the 5th filter capacitor and the 6th filter capacitor;
One end of described 4th filter capacitor is connected with one end of described current sink circuit, the other end ground connection of described 4th filter capacitor;
One end of described 5th filter capacitor is connected with the other end of described current sink circuit, the other end ground connection of described 5th filter capacitor;
One end of described 6th filter capacitor is connected with one end of described current sink circuit, and the other end of described 6th filter capacitor is connected with the other end of described current sink circuit.
In conjunction with the first possible implementation of first aspect, in the 7th kind of possible implementation, described current sink comprises:
Any one current sink in piezo-resistance, gas discharge tube and Transient Suppression Diode.
In conjunction with in first aspect or the first possible implementation of first aspect or the possible implementation of the second of first aspect or the 7th kind of possible implementation of the 5th kind of possible implementation of the third possible implementation of first aspect or the 4th kind of possible implementation of first aspect or first aspect or the 6th kind of possible implementation of first aspect or first aspect, in the 8th kind of possible implementation, described load comprises:
Switching power circuit.
In conjunction with in first aspect or the first possible implementation of first aspect or the possible implementation of the second of first aspect or the 7th kind of possible implementation of the 5th kind of possible implementation of the third possible implementation of first aspect or the 4th kind of possible implementation of first aspect or first aspect or the 6th kind of possible implementation of first aspect or first aspect, in the 9th kind of possible implementation, described power supply comprises: switching power circuit.
Second aspect present invention provides a kind of filter, and described filter comprises filter circuit as above.
Therefore in some embodiments of the invention, a kind of filter circuit construction of the present invention is simple, safe and reliable.When carrying out suppression interference signal to the input and output of Switching Power Supply and improving interference rejection ability, circuit height is integrated, makes the printed circuit board area that takies little, and adopt device few, effectively reduce production cost, make product economy practical, improve the competitiveness of product.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the circuit theory diagrams of a kind of filter circuit that the embodiment of the present invention provides;
Fig. 2 is the structure chart of a kind of inductor that the embodiment of the present invention provides;
Fig. 3 is the structure chart of the another kind of inductor that the embodiment of the present invention provides;
Fig. 4 is the structure chart of another inductor that the embodiment of the present invention provides;
Fig. 5 is the circuit theory diagrams of the filter circuit of a kind of common mode interference signal that the embodiment of the present invention provides;
Fig. 6 is the circuit theory diagrams of the filter circuit of a kind of differential mode interference signal that the embodiment of the present invention provides.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Referring to Fig. 1, is the circuit theory diagrams of a kind of filter circuit that the embodiment of the present invention provides.As shown in Figure 1, described filter circuit comprises power supply 100, and described circuit is connected with load 200, and wherein, described filter circuit comprises:
Inductor 300 and the first filter circuit 400.
Described inductor 300 comprises magnetic core, the first winding and the second winding, and described magnetic core comprises toroidal magnet and magnetic post, and described magnetic post is arranged in the inner ring that described toroidal magnet surrounds, and the two ends of described magnetic post are connected with described toroidal magnet respectively;
One end of first winding of described inductor 300 is connected with the positive pole of described power supply, one end of second winding of described inductor 300 is connected with the negative pole of described power supply, the other end of the first winding of described inductor 300 is connected with one end of described first filter circuit 400, the other end of the second winding of described inductor 300 is connected with the other end of described first filter circuit 400, the another end ground connection of described first filter circuit;
Described load 200 two ends are connected with the two ends of described first filter circuit 400 respectively.
In embodiments of the present invention, inductor 300 can be magnetic integrated inductor, and inductor 300 can comprise magnetic core, the first winding and the second winding.Wherein, the concrete structure of magnetic core can see Fig. 2.As shown in Figure 2, magnetic core 501 can comprise toroidal magnet 507, magnetic post 505 and 506, and magnetic post can be arranged in the inner ring that toroidal magnet surrounds, and further, magnetic post can be the extension magnetic post that toroidal magnet carries out toward inner ring direction extending.Wherein, magnetic post is in the inner ring of toroidal magnet, and magnetic post and toroidal magnet are from being integrated.Air gap 504 is located on the preset position of magnetic post, and preset position can be the center of magnetic post, then air gap can be divided into magnetic post 505 and magnetic post 506 two parts magnetic post.Further, magnetic post can be divided into two parts toroidal magnet 507, and these two parts have two coils respectively around on these two sections of magnets, form the first winding and the second winding, wherein, the first winding is identical with the coil turn of the second winding.As shown in Figure 3, the first winding can be one end is 101, and the other end is the winding that is coiled into of coil of 103, and the second winding can be one end is 102, and the other end is the winding that is coiled into of coil of 104.Wherein, one end of first winding of inductor 300 can be one end (can coil as shown in Figure 3 one end 101) of one of them coil, the other end of the first winding of inductor 300 can be the other end other end 103 of coil as shown in Figure 3 (can) of one of them coil, one end of second winding of inductor 300 can be another coil one end (can another coil as shown in Figure 3 one end 102), the other end of the second winding of inductor 300 can be the other end other end 104 of another coil as shown in Figure 3 (can) of another coil.Wherein, the spacing being arranged at the air gap on magnetic post can adjust as required, can be used for the saturation current adjusting differential mode interference signal.Wherein, toroidal magnet and magnetic post integrally formed, make the common mode characteristic of inductor 300 good, filtering performance is excellent.
Further, in embodiments of the present invention, toroidal magnet can also be square, rectangle or other close-shaped magnets.Magnetic post also can be separated with toroidal magnet, e.g., is provided with air gap at magnetic post and toroidal magnet junction.As shown in Figure 3, the magnetic post of the magnetic core of inductor 300 is independent magnetic posts 508, air gap is located between the connection of magnetic post 508 and toroidal magnet 507, air gap place is provided with sealing joint strip, sealing joint strip to be arranged in described air gap and to be full of by described air gap, and magnetic post is connected by sealing joint strip with toroidal magnet.
Further, circuit also comprises:
Current sink circuit 500;
One end of described current sink circuit 500 is connected with the positive pole of described power supply, and the other end of described current sink circuit 500 is connected with the negative pole of described power supply.
In embodiments of the present invention, current sink circuit 500 can be that the current sink R4 in circuit, current sink R4 can comprise and being not limited to: any one in piezo-resistance, gas discharge tube and Transient Suppression Diode.Current sink circuit 500 may be used for suppressing voltage jump, reduces the outside interference to switching power circuit, improves the interference rejection ability of Switching Power Supply.
Further, described circuit also comprises:
Second filter circuit 600;
One end of described second filter circuit 600 is connected with one end of the first winding of described inductor 300, and the other end of described second filter circuit 600 is connected with one end of the second winding of described inductor 300, the another end ground connection of described second filter circuit.
Further, described first filter circuit 400 comprises:
First filter capacitor C6, the second filter capacitor C7 and the 3rd filter capacitor C8;
One end of described first filter capacitor C6 is connected with the other end of the first winding of described inductor 300, the other end ground connection of described first filter capacitor C6, one end of described second filtering C7 electric capacity is connected with the other end of the second winding of described inductor 300, the other end ground connection of described second filter capacitor C7, one end of described 3rd filter capacitor C8 is connected with the other end of the first winding of described inductor 300, and the other end of described 3rd filter capacitor C8 is connected with the other end of the second winding of described inductor 300.
Wherein, we are understandable that, electric capacity C6 and C7 can be common mode filtering electric capacity, i.e. Y capacitance, for eliminating common-mode noise, carry out filtering to circuit, and amount of capacity can be 1nF ~ 300nF.Electric capacity C7 is differential mode capacitor, i.e. X electric capacity, for eliminating differential mode noise, carries out filtering to circuit.Further, in embodiments of the present invention, the first filter circuit can carry out adding or removing electric capacity as required, such as: remove electric capacity C6, or add more X electric capacity.Be not limited at this.
Further, described second filter circuit 700 comprises:
4th filter capacitor C9, the 5th filter capacitor C10 and the 6th filter capacitor C11;
One end of described 4th filter capacitor C9 is connected with one end of described current sink circuit 500, the other end ground connection of described 4th filter capacitor C9, one end of described 5th filter capacitor C10 is connected with the other end of described current sink circuit 500, the other end ground connection of described 5th filter capacitor C10, one end of described 6th filter capacitor C11 is connected with one end of described current sink circuit 500, and the other end of described 6th filter capacitor C11 is connected with the other end of described current sink circuit 500.
Wherein, we are understandable that, electric capacity C9 and C10 can be common mode filtering electric capacity, i.e. Y capacitance, for eliminating common-mode noise, carry out filtering to circuit, and amount of capacity can be 1nF ~ 300nF.Electric capacity C11 is differential mode capacitor, i.e. X electric capacity, for eliminating differential mode noise, carries out filtering to circuit.Further, in embodiments of the present invention, the second filter circuit can carry out adding or removing electric capacity as required, such as: remove electric capacity C9, or add more X electric capacity.Be not limited at this.
Further, described load 200 can comprise switching power circuit, and namely described filter circuit can be connected with the input of switching power circuit, for carrying out filtering to the input of switch power end, reduce the outside interference to switching power circuit, improve the interference rejection ability of switching power circuit.
Described power supply 100 also can comprise switching power circuit, and namely described filter circuit can be connected with the output of switching power circuit, for carrying out filtering to the output of switch power end.
The invention provides a kind of filter, described filter can comprise filter circuit, and the circuit structure of the filter circuit in described filter can see Fig. 1.
Below in conjunction with Fig. 1 and Fig. 4 and Fig. 5, the operation principle of described filter circuit is described in detail.
When there is common-mode interference current in filter circuit, common mode disturbances filter circuit that can be shown in Figure 4, the direction of arrow in figure is the direction of common-mode interference current.Then, common-mode interference current produces magnetic field by the coil of the first half 101 of the toroidal magnet of inductor, and wherein, the magnetic direction of toroidal magnet inside is that the magnetic direction of magnetic post inside is right direction counterclockwise; Common-mode interference current also produces magnetic field by the coil of the latter half 102 of the toroidal magnet of inductor, and wherein, the magnetic direction of toroidal magnet inside is counterclockwise, is left direction at the magnetic direction of magnetic post inside.Because the coil of the upper part toroidal magnet of inductance is identical with the number of turn of the coil of lower part toroidal magnet, then the coil of the first half toroidal magnet is identical with the magnetic field size that the coil of the latter half toroidal magnet produces in magnetic post inside in the magnetic field of magnetic post inside generation, direction is contrary, cancelling out each other in the magnetic field of the magnetic post then in inductor, passes through without magnetic flux.Further, the coil of the first half toroidal magnet is identical with the magnetic direction that the coil of the latter half toroidal magnet produces at magnet in the magnetic field that magnet produces, then magnetic field is added in the same way, then now the toroidal magnet of inductor presents high impedance, produce stronger damping, attenuation common-mode electric current, reaches the object of filtering common mode electric current, thus plays the effect suppressing common-mode noise.
When there is differential mode interference electric current in filter circuit, differential mode interference filter circuit that can be shown in Figure 5, the direction of arrow in figure is differential mode interference sense of current.Then, common-mode interference current produces magnetic field by the coil of the first half 201 of the toroidal magnet of inductor, and wherein, the magnetic direction of toroidal magnet inside is that the magnetic direction of magnetic post inside is right direction counterclockwise; Differential mode interference electric current also produces magnetic field by the coil of the latter half 202 of the toroidal magnet of inductor, and wherein, the magnetic direction of toroidal magnet inside is clockwise, is right direction at the magnetic direction of magnetic post inside.In toroidal magnet inside, although the magnetic direction of the first half of toroidal magnet is counterclockwise, the magnetic direction of the latter half of toroidal magnet is that do not offset each other, therefore toroidal magnet inside exists magnetic flux, toroidal magnet presents high impedance clockwise.Further, because the coil of the first half toroidal magnet is identical with the magnetic direction that the coil of the latter half toroidal magnet produces on magnetic post in the magnetic field that magnetic post produces, then magnetic field homophase is added, and magnetic post also presents high impedance.We are understandable that thus, and now the toroidal magnet of inductor and magnetic post all present high impedance, produce stronger damping, and decay differential-mode current, reaches the object of filtering differential-mode current, thus plays the effect suppressing differential mode noise.Further, the air gap that magnetic post is provided with can improve the saturation current of differential mode interference.
Further, when filter circuit receives the extraneous electromagnetic interference signal interference produced, such as: during thunderbolt interference, the circuit theory diagrams of filter circuit that can be shown in Figure 1.When circuit is subject to thunderbolt interference; because transient voltage ER effect is large; inductor hinders the thunder-strike current of transient state to flow to power source internal by producing very large impedance; and force thunder-strike current to flow to another branch road; the i.e. branch road at current sink R4 place; current sink R4 can suppress voltage jump, reduces circuit interference, thus protects power circuit.
Therefore in some embodiments of the invention, a kind of filter circuit construction of the present invention is simple, safe and reliable.Suppression interference signal can be carried out to the input and output of Switching Power Supply, improve interference rejection ability, and circuit height be integrated, make the printed circuit board area that takies little, and adopt device few, effectively reduce production cost, make product economy practical, improve the competitiveness of product.
One of ordinary skill in the art will appreciate that all or part of flow process realized in above-described embodiment method, that the hardware that can carry out instruction relevant by computer program has come, described program can be stored in a computer read/write memory medium, this program, when performing, can comprise the flow process of the embodiment as above-mentioned each side method.Wherein, described storage medium can be magnetic disc, CD, read-only store-memory body (Read-Only Memory, ROM) or random store-memory body (Random Access Memory, RAM) etc.
Above disclosedly be only present pre-ferred embodiments, certainly can not limit the interest field of the present invention with this, therefore according to the equivalent variations that the claims in the present invention are done, still belong to the scope that the present invention is contained.
Claims (11)
1. a filter circuit, is characterized in that, described circuit is connected with load, and described circuit comprises power supply, inductor and the first filter circuit, wherein,
Described inductor comprises magnetic core, the first winding and the second winding, and described magnetic core comprises toroidal magnet and magnetic post, and described magnetic post is arranged in the inner ring that described toroidal magnet surrounds, and the two ends of described magnetic post are connected with described toroidal magnet respectively;
One end of first winding of described inductor is connected with the positive pole of described power supply, one end of second winding of described inductor is connected with the negative pole of described power supply, the other end of the first winding of described inductor is connected with one end of described first filter circuit, the other end of the second winding of described inductor is connected with the other end of described first filter circuit, the another end ground connection of described first filter circuit;
Described first filter circuit two ends are connected with described load two ends.
2. circuit as claimed in claim 1, it is characterized in that, described circuit comprises:
Current sink circuit;
One end of described current sink circuit is connected with the positive pole of described power supply, and the other end of described current sink circuit is connected with the negative pole of described power supply.
3. circuit as claimed in claim 1 or 2, it is characterized in that, described circuit also comprises:
Second filter circuit;
One end of described second filter circuit is connected with one end of described first winding, and the other end of described second filter circuit is connected with one end of described second winding, the another end ground connection of described second filter circuit.
4. the circuit as described in any one of claim 1-3, is characterized in that, the preset position of described magnetic post is provided with air gap.
5. the circuit as described in any one of claim 1-4, is characterized in that, the junction of described magnetic post and described toroidal magnet is provided with air gap, and described air gap place is provided with sealing joint strip, and described sealing joint strip to be arranged in described air gap and to be full of by described air gap.
6. the circuit as described in any one of claim 1-5, is characterized in that, described first filter circuit comprises:
First filter capacitor, the second filter capacitor and the 3rd filter capacitor;
One end of described first filter capacitor is connected with the other end of described first winding, the other end ground connection of described first filter capacitor;
One end of described second filter capacitor is connected with the other end of described second winding, the other end ground connection of described second filter capacitor;
One end of described 3rd filter capacitor is connected with the other end of described first winding, and the other end of described 3rd filter capacitor is connected with the other end of described second winding.
7. circuit as claimed in claim 3, it is characterized in that, described second filter circuit comprises:
4th filter capacitor, the 5th filter capacitor and the 6th filter capacitor;
One end of described 4th filter capacitor is connected with one end of described current sink circuit, the other end ground connection of described 4th filter capacitor;
One end of described 5th filter capacitor is connected with the other end of described current sink circuit, the other end ground connection of described 5th filter capacitor;
One end of described 6th filter capacitor is connected with one end of described current sink circuit, and the other end of described 6th filter capacitor is connected with the other end of described current sink circuit.
8. circuit as claimed in claim 2, it is characterized in that, described current sink circuit comprises:
Any one current sink in piezo-resistance, gas discharge tube and Transient Suppression Diode.
9. the circuit as described in any one of claim 1-8, is characterized in that, described load comprises: switching power circuit.
10. the circuit as described in any one of claim 1-8, is characterized in that, described power supply comprises: switching power circuit.
11. 1 kinds of filters, is characterized in that, described filter comprises the filter circuit as described in any one of claim 1-10.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410699003.9A CN104539148A (en) | 2014-11-27 | 2014-11-27 | Filter circuit and device |
| PCT/CN2015/093667 WO2016082662A1 (en) | 2014-11-27 | 2015-11-03 | Filter circuit and apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410699003.9A CN104539148A (en) | 2014-11-27 | 2014-11-27 | Filter circuit and device |
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| CN104539148A true CN104539148A (en) | 2015-04-22 |
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| CN201410699003.9A Pending CN104539148A (en) | 2014-11-27 | 2014-11-27 | Filter circuit and device |
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| WO (1) | WO2016082662A1 (en) |
Cited By (5)
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| WO2016082662A1 (en) * | 2014-11-27 | 2016-06-02 | 华为技术有限公司 | Filter circuit and apparatus |
| CN106301273A (en) * | 2015-05-29 | 2017-01-04 | 台达电子工业股份有限公司 | It is applied to the filter circuit of LAN |
| CN108604889A (en) * | 2016-02-05 | 2018-09-28 | 阿莫泰克有限公司 | Differential mode and common mode dual-purpose filter |
| CN109787423A (en) * | 2019-01-18 | 2019-05-21 | 上海熠动动力科技有限公司 | A kind of EMC filter module and its electric machine controller |
| CN111108812A (en) * | 2017-10-25 | 2020-05-05 | 伊莱克斯家用电器股份公司 | Induction hob comprising an electromagnetic interference filter |
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| CN108336898A (en) * | 2018-04-11 | 2018-07-27 | 四川升华电源科技有限公司 | Brick filter module and power supply module |
| KR20210115328A (en) * | 2020-03-12 | 2021-09-27 | 엘지전자 주식회사 | Electric range |
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| CN201656765U (en) * | 2010-02-12 | 2010-11-24 | Emif科技有限公司 | EMI filter |
| CN202889189U (en) * | 2012-11-02 | 2013-04-17 | 上海儒竞电子科技有限公司 | Direct-current electromagnetic interference filter circuit |
| CN104539148A (en) * | 2014-11-27 | 2015-04-22 | 华为技术有限公司 | Filter circuit and device |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016082662A1 (en) * | 2014-11-27 | 2016-06-02 | 华为技术有限公司 | Filter circuit and apparatus |
| CN106301273A (en) * | 2015-05-29 | 2017-01-04 | 台达电子工业股份有限公司 | It is applied to the filter circuit of LAN |
| CN106301273B (en) * | 2015-05-29 | 2019-04-23 | 台达电子工业股份有限公司 | Filter circuit applied to local area network |
| CN108604889A (en) * | 2016-02-05 | 2018-09-28 | 阿莫泰克有限公司 | Differential mode and common mode dual-purpose filter |
| CN111108812A (en) * | 2017-10-25 | 2020-05-05 | 伊莱克斯家用电器股份公司 | Induction hob comprising an electromagnetic interference filter |
| CN109787423A (en) * | 2019-01-18 | 2019-05-21 | 上海熠动动力科技有限公司 | A kind of EMC filter module and its electric machine controller |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2016082662A1 (en) | 2016-06-02 |
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