CN113314320A - Common mode inductance assembly, filter circuit and household air conditioner - Google Patents

Common mode inductance assembly, filter circuit and household air conditioner Download PDF

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Publication number
CN113314320A
CN113314320A CN202110733375.9A CN202110733375A CN113314320A CN 113314320 A CN113314320 A CN 113314320A CN 202110733375 A CN202110733375 A CN 202110733375A CN 113314320 A CN113314320 A CN 113314320A
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CN
China
Prior art keywords
magnetic ring
power line
common mode
line
ground wire
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Pending
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CN202110733375.9A
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Chinese (zh)
Inventor
黄可可
谭华泉
王明明
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GD Midea Air Conditioning Equipment Co Ltd
Foshan Shunde Midea Electric Science and Technology Co Ltd
Original Assignee
GD Midea Air Conditioning Equipment Co Ltd
Foshan Shunde Midea Electric Science and Technology Co Ltd
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Application filed by GD Midea Air Conditioning Equipment Co Ltd, Foshan Shunde Midea Electric Science and Technology Co Ltd filed Critical GD Midea Air Conditioning Equipment Co Ltd
Priority to CN202110733375.9A priority Critical patent/CN113314320A/en
Publication of CN113314320A publication Critical patent/CN113314320A/en
Pending legal-status Critical Current

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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
    • H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • 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
    • 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
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
    • H01F27/38—Auxiliary core members; Auxiliary coils or windings
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/01—Frequency selective two-port networks

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Filters And Equalizers (AREA)

Abstract

The invention discloses a common-mode inductor assembly, a filter circuit and a household air conditioner. The common mode inductance assembly comprises a first magnetic ring, a second magnetic ring, a first power line, a second power line and a ground wire. The diameter of the first magnetic ring is larger than that of the second magnetic ring. The first power line and the second power line are wound on the first magnetic ring to form a common mode inductor. The ground line includes a first segment and a second segment. The first section of the ground wire is wound on the first magnetic ring. The magnetic flux generated by the first segment of the ground line during operation is superimposed in phase with the magnetic flux generated by the first power line during operation. The second section of the ground wire is wound on the second magnetic ring. The common mode inductance component can simultaneously restrain interference signals of a low frequency band and a high frequency band.

Description

Common mode inductance assembly, filter circuit and household air conditioner
Technical Field
The invention relates to the technical field of electromagnetic compatibility, in particular to a common-mode inductance assembly, a filter circuit and a household air conditioner.
Background
In an electronic and electrical device, in order to meet the requirement of electromagnetic Compatibility (EMC), a Magnetic ring is usually disposed on a power line, and the power line is wound on the Magnetic ring to filter out a common mode interference signal. However, the conventional power line filter is limited by the inner diameter of the magnetic core, and the common mode impedance cannot be improved by increasing the number of turns or the size of the magnetic ring when the volume and the inner diameter are constant. In addition, the filtering frequency band of the traditional power line with the magnetic ring is also narrow.
Disclosure of Invention
Based on the above problems, embodiments of the present invention provide a common mode inductor assembly, which aims to solve the problems of insufficient common mode impedance and narrow filtering frequency band of the conventional common mode inductor assembly.
An embodiment of the present invention provides a common mode inductor assembly, including:
the magnetic circuit comprises a first magnetic ring and a second magnetic ring, wherein the diameter of the first magnetic ring is larger than that of the second magnetic ring;
the first power line and the second power line are wound on the first magnetic ring and form a common-mode inductor;
the ground wire comprises a first section and a second section, the first section of the ground wire is wound on the first magnetic ring, magnetic flux generated by the first section of the ground wire in the working process is superposed with magnetic flux generated by the first power line in the working process in a same phase, and the second section of the ground wire is wound on the second magnetic ring.
In the common mode inductor assembly provided by the embodiment of the invention, the first section of the ground wire, the first power line and the second power line are wound on the first magnetic ring, and magnetic flux generated by the first section of the ground wire in the working process is superposed with magnetic flux generated by the first power line in the working process in the same phase, so that the common mode impedance of the common mode inductor is effectively increased. That is to say, the first section of the ground wire arranged on the first magnetic ring can significantly increase the common-mode impedance of the common-mode inductance component, so that the common-mode interference current in the electronic and electrical equipment can be effectively suppressed. In addition, the second section of the ground wire is wound on the second magnetic ring, and the diameter of the first magnetic ring is larger than that of the second magnetic ring. The winding mode of the second section of the ground wire can effectively restrain high-frequency interference signals of the ground wire radiation loop. Therefore, in the common mode inductance assembly, the common mode impedance can be increased in a mode that the first section of the ground wire is wound on the first magnetic ring so as to inhibit common mode interference signals of a low frequency band (150KHz-5 MHz); the mode that the second section of the ground wire is wound on the second magnetic ring can filter common mode interference signals of a high frequency band (30MHz-50 MHz). Namely, the common mode inductance component can simultaneously take into account the filtering of the interference signal of high frequency range and low frequency range to effectively promote the EMC performance of electronic and electrical equipment.
In an embodiment, the first magnetic ring comprises a first portion and a second portion;
the first power line and the second power line are wound on the first part of the first magnetic ring, and the winding directions of the first power line and the second power line are the same;
the first section of the ground wire is wound on the second part of the first magnetic ring, and the winding direction of the first section of the ground wire is opposite to the winding direction of the first power line.
The first section of the ground wire and the first power wire and the second power wire are wound on the first magnetic core, and the winding direction of the first section of the ground wire is opposite to the winding direction of the first power wire and the second power wire. In the working process, the first section of the ground wire and the power line are positioned in the same magnetic core and are in reverse-phase coupling, and the common-mode current is in the opposite direction in the first section of the ground wire and the power line, so that the arrangement mode of the ground wire can obviously increase the common-mode impedance of the common-mode inductance component, and the common-mode interference current in the electronic and electrical equipment is effectively inhibited.
In an embodiment, the second magnetic ring is attached to the second portion of the first magnetic ring. The first magnetic ring and the second magnetic ring are integrated by attaching the second magnetic ring to the second portion of the first magnetic ring. The operation of forming the first magnetic ring and the second magnetic ring into a whole is also convenient for the subsequent operation of sleeving the first magnetic ring, the second magnetic ring, the first power line, the second power line, the ground wire and the like in the same heat-shrinkable sleeve.
In an embodiment, the ground wire further includes a third segment, the second segment of the ground wire is located between the first segment and the third segment of the ground wire, the third segment of the ground wire is wound on the second portion of the first magnetic ring, and a winding direction of the third segment of the ground wire is opposite to a winding direction of the first power line. The third section of the ground wire is wound on the first magnetic ring, and the winding direction of the third section of the ground wire is opposite to the winding direction of the first power line, so that the common-mode impedance of the common-mode inductance component can be obviously increased, and the common-mode interference current in the electronic and electrical equipment can be effectively inhibited. In addition, the second section of the ground wire is positioned between the first section and the third section of the ground wire, so that the first magnetic ring and the second magnetic ring can be temporarily integrated in the arrangement mode, and the subsequent assembly process is facilitated.
In one embodiment, the first magnetic ring is made of one or more of an amorphous material, a manganese-zinc material or a nickel-zinc material;
and/or the second magnetic ring is made of a nickel-zinc material.
The first magnetic ring is made of amorphous materials, manganese zinc materials or nickel zinc materials. Different materials are generally chosen depending on the frequency band and radiation characteristics of the interference. The second magnetic ring is made of nickel-zinc materials, and the nickel-zinc materials have the characteristics of high frequency, wide frequency, high impedance and low loss, so that the interference of common-mode signals of high frequency bands can be effectively filtered.
In an embodiment, the first power line and the second power line form a single-phase power supply mode, the first power line is a phase line, and the second power line is a zero line. In the technical scheme of this embodiment, a first power line (phase line) and a second power line (zero line) are wound around a first magnetic ring in the same direction, and the number of turns and the phase are the same. When normal working current (differential mode current) in the circuit flows through the common mode inductance component, the working current generates opposite magnetic fields in the inductance coils wound in the same phase and cancels out each other. Therefore, the differential mode impedance of the common mode inductance component is low, and the influence on normal working current is small. When a disturbance current (common mode current) in a circuit flows through the common mode inductance element, a magnetic field in the same direction is generated in the common mode inductance element due to the same direction of the common mode current, so that the inductance of the coil is increased, and the common mode inductance element is represented to have higher common mode impedance.
In an embodiment, the number of winding turns of the first section of the ground wire in the first magnetic ring is smaller than the number of winding turns of the first power line in the first magnetic ring;
and/or the number of winding turns of the second section of the ground wire on the second magnetic ring is larger than that of the first section of the ground wire on the first magnetic ring.
The number of turns of the first section of the ground wire in the first magnetic ring is set to be smaller than the number of turns of the first power line in the first magnetic ring, so that the common-mode impedance of the common-mode inductance assembly can be increased without greatly influencing the working performance of the common-mode inductance composed of the first power line and the second power line. In addition, the first section and the second section of the ground wire are respectively arranged on the first magnetic ring and the second magnetic ring, and the winding turns of the second section of the ground wire on the second magnetic ring is set to be larger than that of the first section of the ground wire on the first magnetic ring, so that the performance of the ground wire for filtering high-frequency interference signals is improved.
In an embodiment, the common mode inductor assembly further includes a heat shrinkage sleeve, and the heat shrinkage sleeve is sleeved outside the first magnetic ring, the second magnetic ring, the first power line, the second power line, and the ground line. The common mode inductor component can form a whole by sleeving the heat-shrinkable sleeve outside the first magnetic ring, the second magnetic ring, the first power line, the second power line and the ground wire, so that subsequent installation and use are facilitated.
Another embodiment of the present invention further provides a filter circuit, including the common mode inductor component according to any one of the above embodiments. By arranging the common mode inductance assembly on the filter circuit, the filter circuit can effectively filter the common mode interference signal current in the working process of the electronic and electrical equipment because the common mode inductance assembly has higher common mode impedance and takes the common mode signal filtering functions of a low frequency band and a high frequency band into account.
Still another embodiment of the present invention provides a household air conditioner, including the common mode inductor assembly according to any one of the above embodiments. By arranging the common-mode inductance assembly on the household air conditioner, the common-mode inductance assembly has higher common-mode impedance and the common-mode signal filtering function of both a low frequency band and a high frequency band, so that the filtering circuit can effectively filter the common-mode interference signal current in the working process of the electronic and electrical equipment.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a common mode inductance assembly according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of another view angle of the common mode inductance assembly in fig. 1.
Fig. 3 is a schematic structural diagram of another view angle of the common mode inductance assembly in fig. 1.
Fig. 4 is a schematic structural diagram of a common mode inductance assembly according to another embodiment of the present invention.
Fig. 5 is a schematic diagram of a current loop of an application circuit having the common mode inductance component of fig. 1 when generating a differential mode current or a common mode current.
Fig. 6 is a schematic structural diagram of a filter circuit having the common mode inductance component in fig. 1.
Fig. 7 is disturbance voltage data obtained during an EMI test of a conventional common mode inductor assembly.
Fig. 8 is disturbance power data obtained during an EMI test of a conventional common mode inductor assembly.
Fig. 9 is disturbance voltage data obtained during an EMI test of the common mode inductor component according to the embodiment of the present invention.
Fig. 10 is disturbance power data obtained in an EMI test process of the common mode inductor component according to the embodiment of the present invention.
The reference numbers illustrate:
reference numerals Name (R) Reference numerals Name (R)
Common mode inductance assembly 100 First magnetic ring 110
Second magnetic ring 120 First power line 130
Second power line 140 Ground wire 150
First stage 151 Second section 152
Third stage 153 The first part 111
The second part 112 Heat-shrinkable sleeve 160
First end 131 Second end 132
Third terminal 141 Fourth terminal 142
One end of 154 The other end of the tube 155
First capacitor C1 Second capacitor C2
Third capacitor C3 Fourth capacitor C4
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture, and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, if the meaning of "and/or" and/or "appears throughout, the meaning includes three parallel schemes, for example," A and/or B "includes scheme A, or scheme B, or a scheme satisfying both schemes A and B. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
Referring to fig. 1 and fig. 2, an embodiment of the invention provides a common mode inductance assembly 100, which includes a first magnetic ring 110, a second magnetic ring 120, a first power line 130, a second power line 140, and a ground line 150.
The diameter of the first magnetic ring 110 is larger than that of the second magnetic ring 120. In this embodiment, the first magnetic ring 110 has an outer diameter of 25mm, an inner diameter of 18mm, and a thickness of 12 mm. The outer diameter of the second magnetic ring 120 is 16mm, the inner diameter is 10mm, and the thickness is 10 mm. It is understood that the first magnetic ring 110 and the second magnetic ring 120 may have other sizes, which may be set according to specific requirements of a product.
The first power line 130 and the second power line 140 are wound around the first magnetic ring 110. The first power line 130 and the second power line 140 constitute a common mode inductor.
The ground wire 150 includes a first segment 151 and a second segment 152. The first segment 151 of the ground wire 150 is wound around the first magnetic ring 110. The magnetic flux generated by the first segment 151 of the ground line 150 during operation is superimposed in phase with the magnetic flux generated by the first power line 130 during operation. The second section 152 of the ground wire 150 is wound around the second magnetic ring 120.
In the common mode inductance assembly 100 provided in the above embodiment, the first segment 151 of the ground wire 150 and the first power line 130 and the second power line 140 are wound on the first magnetic ring 110, and the magnetic flux generated by the first segment 151 of the ground wire 150 during operation is superimposed in phase with the magnetic flux generated by the first power line 130 during operation, so as to effectively increase the common mode impedance of the common mode inductance assembly 100. That is, the first segment 151 of the ground line 150 disposed on the first magnetic ring 110 can significantly increase the common mode impedance of the common mode inductance assembly 100, so that the common mode interference current in the electrical and electronic device can be effectively suppressed. In addition, the second section 152 of the ground wire 150 is wound on the second magnetic ring 120, and the diameter of the first magnetic ring 110 is larger than that of the second magnetic ring 120. The second segment 152 of the ground line 150 is wound in a manner that can effectively suppress high-frequency interference signals of the radiation loop of the ground line 150. It can be seen that in the common mode inductance assembly 100, the first segment 151 of the ground line 150 is wound on the first magnetic ring 110 to increase the common mode impedance, so as to suppress the common mode interference signal in the low frequency band (150KHz-5 MHz). The second section 152 of the ground wire 150 is wound around the second magnetic ring 120 to filter the common mode interference signal in the high frequency band (30MHz-50 MHz). That is, the common mode inductance assembly 100 can filter interference signals of a high frequency band and a low frequency band, so that the EMC performance of the electronic and electrical equipment is effectively improved.
Referring to fig. 3, specifically, the magnetic flux generated by the first power line 130 during operation is Φ 1, the magnetic flux generated by the second power line 140 during operation is Φ 2, and the magnetic flux generated by the first segment 151 of the ground line 150 during operation is Φ 3. The first power line 130 and the second power line 1140 have the same winding direction on the first magnetic ring 110 and have the same number of turns. When a common mode current co-enters and exits the first power line 130 and the second power line 140, the magnetic flux Φ 1 generated by the first power line 130 and the magnetic flux Φ 2 generated by the second power line 140 are superimposed in phase. Since the winding direction of the first segment of the ground line 150 on the first magnetic ring 110 is opposite to the winding direction of the first power line 130 on the first magnetic ring 110, if there is an interference voltage at the power input terminal, the common mode current taking the ground line 150 as a return path forms a closed loop between the first power line 130 and the ground line 150, and forms a closed loop between the second power line 140 and the ground line 150. Because the common mode current in the ground line 150 is opposite to the common mode current in the first power line 130 or the second power line 140, the magnetic flux Φ 3 generated by the first segment 151 of the ground line 150 during operation is also in phase with the magnetic flux Φ 1 generated by the first power line 130 or the magnetic flux Φ 2 generated by the second power line 140. At this time, the magnetic flux Φ 1 generated by the first power line 130, the magnetic flux Φ 2 generated by the second power line 140, and the magnetic flux Φ 3 generated by the first segment 151 of the ground line 150 are superimposed in phase, so that the common mode inductance of each coil is increased, and the common mode impedance of the common mode inductance composed of the first power line 130 and the second power line 140 is further improved. In addition, since the first power line 130 and the second power line 140 are approximately balanced with respect to the ground line 150, and the common mode current in the ground line 150 tends to be small, the influence of the ground line 150 on the differential mode signal current in the first power line 130 and the second power line 140 is negligible.
Specifically, the first magnetic ring 110 and the second magnetic ring 120 are both disposed in a circular ring shape to form a closed magnetic circuit. The first magnetic ring 110 and the second magnetic ring 120 are arranged in a manner that magnetic flux leakage is reduced. In this embodiment, the first magnetic ring 110 includes a first portion 111 and a second portion 112. Specifically, the first portion 111 and the second portion 112 of the first magnetic ring 110 are both semi-circular ring shapes, which together form an integral body of the first magnetic ring 110. The first portion 111 and the second portion 112 may be respectively disposed at the upper and lower portions of the first magnetic ring 110, or may be respectively disposed at the left and right portions of the first magnetic ring 110, which can be set by those skilled in the art according to the specific requirements of the product. If necessary, an outer surface of the first magnetic ring 110 may be provided with an insulating member (not shown) for insulating the first magnetic ring 110 from the first power line 130, the second power line 140, and the ground line 150. In particular, the insulating member may be one or more of an insulating heat shrink sleeve, an insulating plastic film, or an insulating paint. By arranging the insulating part on the first magnetic ring 110, when the first power line 130 and the second power line 140 are wound around the first magnetic ring 110, the first power line 130 and the second power line 140 can be prevented from being electrically connected with the first magnetic ring 110, thereby causing the function failure of the common mode inductance assembly 100. According to the requirement, the material for manufacturing the first magnetic ring 110 includes one or more of an amorphous material, a manganese-zinc material or a nickel-zinc material. The second magnetic ring 120 is made of nickel-zinc material as required. Specifically, the first magnetic ring 110 may be made of an amorphous magnetic material, a ferrite material such as manganese zinc ferrite, nickel zinc ferrite, or the like, or a magnetic material such as iron powder. Generally, the first magnetic ring 110 is made of an amorphous material, or a manganese-zinc material or a nickel-zinc material. Different materials are generally chosen depending on the frequency band and radiation characteristics of the interference. The second magnetic ring 120 is made of nickel-zinc material. The nickel-zinc material has the characteristics of high frequency, wide frequency, high impedance and low loss. The second magnetic ring 120 is made of nickel-zinc material, so that the interference of the common-mode signal of the high frequency band can be effectively filtered. Generally, the first magnetic ring 110 should be made of a material with a suitable magnetic permeability, so as to prevent the first magnetic ring 110 from entering a saturation state during an actual operation process and affecting the performance of the common mode inductance assembly 100 for filtering the common mode interference signal. The shape of the first magnetic ring 110 may also be an elliptical shape, a racetrack shape, or a polygonal ring shape, which may be determined according to actual requirements of products and is not specifically limited herein.
Specifically, the first power line 130 is wound around the first portion 111 of the first magnetic ring 110. The second power line 140 is wound around the first portion 111 of the first magnetic ring 110. The winding direction of the second power line 140 is the same as the winding direction of the first power line 130. Specifically, in the present embodiment, the winding directions of the first power line 130 and the second power line 140 are: the winding is performed in a clockwise direction from the outer side (facing the observer) of the first magnetic ring 110 to the inner side (facing away from the observer) of the first magnetic ring 110 in the direction from the left side to the right side. Since the winding direction and the winding position of the first power line 130 and the second power line 140 are the same, the first power line 130 and the second power line 140 can be simultaneously wound on the first portion 111 of the first magnetic ring 110 during the actual manufacturing process, so as to simplify the manufacturing process. It is understood that the outer surfaces of the first power line 130 and the second power line 140 may be provided with an insulating sheath, an insulating film, or an insulating paint, so that the first power line 130 and the second power line 140 do not conduct with each other while being wound around the first portion 111 of the first magnetic ring 110. Meanwhile, the insulating sheath, the insulating film, or the insulating paint may prevent the first and second power lines 130 and 140 from being electrically connected to the first magnetic ring 110. The first power line 130 and the second power line 140 must also be insulated from each other as needed to ensure that a short circuit does not occur between the first power line 130 and the second power line under the transient overvoltage. The first power line 130 and the second power line 140 are wound as much as possible to form a single-layer coil, so as to reduce the parasitic capacitance between the coils.
The first segment 151 of the ground wire 150 is disposed around the second portion 112 of the first magnetic ring 110. The winding direction of the first segment 151 of the ground line 150 is opposite to the winding direction of the first power line 130. Specifically, in the present embodiment, the winding direction of the first segment 151 of the ground wire 150 is: in the top region of the first magnetic ring 110, the winding is performed in a counterclockwise direction from the outer side (facing the viewer) of the first magnetic ring 110 to the inner side (facing away from the viewer) of the first magnetic ring 110 in the left-to-right direction. If necessary, the winding directions of the first power line 130 and the second power line 140 may be: winding clockwise from the inner side (the direction back to the observer) of the first magnetic ring 110 to the outer side (the direction facing the observer) of the first magnetic ring 110 along the direction from the left side to the right side; the winding direction of the ground wire 150 is: in the bottom region of the first magnetic ring 110, the magnetic ring is wound in a counterclockwise direction from the inner side (the direction away from the observer) of the first magnetic ring 110 to the outer side (the direction facing the observer) of the first magnetic ring 110 in the direction from the left side to the right side. As long as the winding direction of the first segment 151 of the ground line 150 is opposite to the winding direction of the first power line 130. Specifically, the ground wire 150 refers to a wire connecting the power input terminal with the ground due to safety requirements of the electrical and electronic equipment. If necessary, an insulating sleeve, an insulating film or an insulating paint may be disposed on the outer surface of the ground wire 150 to prevent the ground wire 150 from being electrically connected to the first magnetic ring 110. The ground wire 150 is wound as much as possible around the single-layer coil to reduce the parasitic capacitance between the coils, if desired.
That is, the first segment 151 of the ground wire 150 and the first and second power wires 130 and 140 are wound on the first magnetic core 110, and the winding direction of the first segment 151 of the ground wire 150 is opposite to the winding direction of the first and second power wires 130 and 140. In operation, the first segment 151 of the ground line 150 and the first and second power lines 130 and 140 are located in the first magnetic ring 110 and are coupled in opposite phases, and the common mode current is in the opposite direction in the first segment 151 of the ground line 150 and the first and second power lines 130 and 140, so that the first segment 151 of the ground line 150 is disposed in a manner that can significantly increase the common mode impedance of the common mode inductance assembly 100, thereby effectively suppressing the common mode interference current in the electrical and electronic device.
In one embodiment, the second magnetic ring 120 is attached to the second portion 112 of the first magnetic ring 110. By attaching the second magnetic ring 120 to the second portion 112 of the first magnetic ring 110, the first magnetic ring 110 and the second magnetic ring 120 are formed as a single unit for subsequent assembly or operation. For example, when the common mode inductor assembly 100 needs to be sleeved inside the heat shrinkage sleeve subsequently, the first magnetic ring 110 and the second magnetic ring 120 are attached together, so that the first magnetic ring 110, the second magnetic ring 120, the first power line 130, the second power line 140, the ground line 150, and the like are sleeved together.
In one embodiment, the ground wire 150 further includes a third segment 153, as shown in FIG. 4. The second segment 152 of the ground wire 150 is located between the first segment 151 and the third segment 153 of the ground wire 150. The third segment 153 of the ground wire 150 is wound around the second portion 112 of the first magnetic ring 110. The winding direction of the third segment 153 of the ground wire 150 is opposite to the winding direction of the first power wire 130. The third segment 153 of the ground wire 150 is wound on the first magnetic ring 110 in a direction opposite to the winding direction of the first power line 130. The third segment 153 of the ground line 150 can also significantly increase the common-mode impedance of the common-mode inductance assembly 100, thereby effectively suppressing the common-mode interference current in the electrical and electronic device. In addition, since the second segment 152 of the ground wire 150 is located between the first segment 151 and the third segment 153 of the ground wire 150, the above-mentioned arrangement can temporarily form the first magnetic ring 110 and the second magnetic ring 120 as a whole, so as to facilitate the subsequent assembly process. That is, since the first segment 151 and the third segment 153 of the ground wire 150 are wound around the first magnetic ring 110, the second magnetic ring 120 can be fixed on the first magnetic ring 110 to form a temporary whole, so as to facilitate the subsequent assembling process.
In one embodiment, the first power line 130 and the second power line 140 constitute a single-phase power supply. The first power line 130 is a phase line and is connected to a phase line voltage. The second power line 140 is a neutral line connected to a neutral voltage. At this time, as described above, the first power line 130 (phase line) and the second power line 140 (neutral line) are wound around the same first magnetic ring 110 in the same direction, and the number of turns and the phase are the same. When the normal operating current (differential mode current) in the circuit flows through the common mode inductor assembly 100, the operating current generates opposite magnetic fields in the inductors wound in the same phase to cancel each other out. That is, the differential mode impedance of the common mode inductance component 100 is low and has little effect on the normal operating current. When an interference current (common mode current) in the circuit flows through the common mode inductance element 100, due to the common mode current's isotropy, an equidirectional magnetic field is generated in the common mode inductance element 100 to increase the inductive reactance of the coil, so that the common mode inductance element 100 exhibits a high common mode impedance characteristic, thereby playing a role in filtering a common mode interference signal current.
In one embodiment, the number of winding turns of the first segment 151 of the ground wire 150 on the first magnetic ring 110 is smaller than that of winding turns of the first power wire 130 on the first magnetic ring 110. As required, the number of winding turns of the second section 152 of the ground wire 150 on the second magnetic ring 120 is greater than that of the first section 151 of the ground wire 150 on the first magnetic ring 110. Specifically, the first power line 130 and the second power line 140 are wound on the first magnetic ring 110 for 4 turns. The first segment 151 of the ground wire 150 is wound around the first magnetic ring 110 for 1 turn. The second segment 152 of the ground wire 150 is wound 5 times on the second magnetic ring 120. In a specific winding process, the first power line 130 and the second power line 140 may be simultaneously wound on the first magnetic ring 110 for 4 turns, then the second segment 152 of the ground line 150 is wound on the second magnetic ring 120 for 5 turns, and finally the first segment 151 of the ground line 150 is reversely wound on the first magnetic ring 110 for 1 turn, so that the first magnetic ring 110 and the second magnetic ring 120 are combined together.
By setting the number of winding turns of the first segment 151 of the ground wire 150 on the first magnetic ring 110 to be smaller than the number of winding turns of the first power line 130 on the first magnetic ring 110, the common mode impedance of the common mode inductor assembly 100 can be increased without greatly affecting the working performance of the common mode inductor formed by the first power line 130 and the second power line 140. In addition, since the first segment 151 and the second segment 152 of the ground wire 150 are respectively disposed on the first magnetic ring 110 and the second magnetic ring 120, the number of winding turns of the second segment 152 of the ground wire 150 on the second magnetic ring 120 is set to be greater than the number of winding turns of the first segment 151 of the ground wire 150 on the first magnetic ring 110, which is helpful for improving the performance of the ground wire 150 for filtering out high-frequency interference signals.
In one embodiment, the common mode inductor assembly 100 further comprises a heat shrink sleeve 160. The heat-shrinkable sleeve 160 is sleeved outside the first magnetic ring 110, the second magnetic ring 120, the first power line 130, the second power line 140 and the ground line 150. By sleeving the heat shrinkable sleeve 160 on the first magnetic ring 110, the second magnetic ring 120, the first power line 130, the second power line 140 and the ground line 150, the heat shrinkable sleeve 160 can form the common mode inductor assembly 100 as a whole, so as to facilitate subsequent installation and use. Specifically, after the first power line 130, the second power line 140 and the ground line 150 are wound, the heat shrinkage sleeve 160 may be sleeved outside the first magnetic ring 110, the second magnetic ring 120, the first power line 130, the second power line 140 and the ground line 150. Then, the heat shrink 160 is heated to shrink the heat shrink 160, so that the common mode inductance assembly 100 is formed as a whole.
The common mode inductor assembly 100 works as follows:
in the working process of the electronic and electrical equipment, a common-mode coupling path exists among a current back-and-forth path in a current loop, a positive electrode and a negative electrode of an electronic device and a ground wire, so that a common-mode interference signal is generated. The common mode interference signal is generally equal in amplitude and same in phase on each current round-trip path.
Referring to fig. 5, in order to reduce the effect of the common mode interference signal on the load, a common mode inductance component 100 is generally connected in series in the current round-trip path to increase the common mode impedance in the current loop, thereby reducing the common mode current in the current loop. Taking a single-phase power input end as an example, the single-phase power input end comprises a phase line voltage end L and a zero line voltage end N. The first end 131 of the first power line 130 is connected to the phase line voltage end L, and the first end 141 of the second power line 140 is connected to the neutral line voltage end N; the second end 132 of the first power line 130 is connected to one end of the load, and the second end 142 of the second power line 140 is connected to the other end of the load.
For differential mode current IDMNSaid, becauseInductance L in the first power line 130CM1The generated magnetic flux and the inductance L in the second power line 140CM2The generated magnetic flux is reversed, and the inductance LCM1Generated magnetic flux Φ 1 and inductance LCM2The generated magnetic fluxes Φ 2 cancel each other out, so that the differential mode impedance of the common mode inductance composed of the first power supply line 130 and the second power supply line 140 approaches zero.
For common mode current ICMNIn other words, due to the inductance L in the first power line 130CM1The generated magnetic flux and the inductance L in the second power line 140CM2The generated magnetic fluxes are in the same direction, and the inductance LCM1Generated magnetic flux Φ 1 and inductance LCM2The generated magnetic fluxes Φ 2 reinforce each other, so that the common mode impedance of the common mode inductance composed of the first power supply line 130 and the second power supply line 140 is large. At the same time, due to the inductance L in the ground line 150GAnd the inductance L in the first power line 130CM1Leads to an inductance L in the ground line 150GThe generated magnetic flux and the inductance L in the first power line 130CM1The generated magnetic fluxes are in the same direction, thereby further increasing the common mode impedance of the common mode inductor formed by the first power line 130 and the second power line 140.
Specifically, taking the signal current in the first power line 130 as a positive example, assume that the differential mode current IDMNIn the same direction as the signal current Is on the first power line 130, the total current I in the first power line 1301＝Is+IDMN(ii) a Total current I in the second power line 1402＝-Is+IDMN. Wherein Is the magnitude of the signal current, IDMNIs the magnitude of the differential mode current. That is, the magnetic fields induced in the first magnetic ring 110 by the first power line 130 and the second power line 140 are equal in magnitude and opposite in direction, and cancel each other out. Therefore, the signal current Is has a small inductive reactance in the common mode inductor assembly 100, and the differential mode attenuation in the signal loop Is small.
Whereas for common mode interference signals in the first power line 130 and the second power line 140, due to the formed common mode current ICMNEqual in size and same in phase, thereby inducing in-phase superposition in the first magnetic ring 110Magnetic field, thereby causing a common mode current ICMNThe common mode interference signal current is filtered by the larger alternating current impedance.
However, for some specific applications, the common mode ac impedance formed by the first power line 130 and the second power line 140 is not high enough. Therefore, in the common mode inductance assembly 100 according to the embodiment of the invention, the first segment 151 of the ground line 150 and the first and second power lines 130 and 140 are wound on the first magnetic ring 110, and the winding direction of the first segment 151 of the ground line 150 is opposite to the winding direction of the first and second power lines 130 and 140. Thus, during operation, the total current I flowing through the ground line 150PEIc. That is, the magnetic field induced in the first magnetic ring 110 by the common mode interference signal current Ic in the ground line 150 and the magnetic field induced in the first magnetic ring 110 by the first power line 130 and the second power line 140 are superimposed, so that the common mode inductance assembly 100 has a larger ac impedance with respect to the common mode signal current, thereby playing a role in filtering the common mode interference signal current in the electrical and electronic device. On the other hand, the second section 152 of the ground wire 150 is also wound on the second magnetic ring 120. Because the diameter of the second magnetic ring 120 is smaller than the diameter of the first magnetic ring 110, and the second magnetic ring 120 is made of nickel-zinc material, the second section 152 of the ground wire 150 can effectively filter the interference signal of high frequency band, so that the common mode inductance assembly 100 can filter both the low frequency common mode interference signal and the high frequency common mode interference signal.
It is understood that the first terminal 131 of the first power line 130 and the third terminal 141 of the second power line 140 are disposed adjacent to each other and are homonymous terminals to each other. The second end 132 of the first power line 130 and the fourth end 142 of the second power line 140 are disposed adjacent to each other and are the same-name ends. Since the first terminal 131 and the third terminal 141 are disposed adjacent to each other and are homonymous terminals, the second terminal 132 and the fourth terminal 142 are disposed adjacent to each other and are homonymous terminals. When a common mode current flows through the common mode inductance device 100, a magnetic field in the same direction is generated in the common mode inductance device 100 due to the same direction of the common mode current, so as to increase the inductance of the coil, which is expressed as a high common mode impedance. Specifically, the homonymous end and the synonym end refer to: under the action of the same changing magnetic flux, the terminals with the same induced electromotive force polarity are called homonymous terminals, and the terminals with the opposite induced electromotive force polarity are called synonym terminals. On the drawing of the figure file, a group of homonymous terminals is generally marked with the symbol "·".
It is understood that the fifth terminal 154 of the first segment 151 of the ground line 150 is disposed adjacent to the first terminal 131 of the first power line 130 and the third terminal 141 of the second power line 140 and is a different name terminal from each other. The connection ends of the first segment 151 and the second segment 152 of the ground line 150 are disposed adjacent to the second end 132 of the first power line 130 and the fourth end 142 of the second power line 140 and are opposite-name ends. Since the fifth end 154 of the ground wire 150 is disposed adjacent to the first end 131 and is a synonym end, the connection ends of the first segment 151 and the second segment 152 of the ground wire 150 are disposed adjacent to the second end 132 and are synonym ends. When a common mode current flows through the common mode inductance element 100, the common mode interference current between the power lines 120, 130 and the ground line 150 is equivalent to a differential mode current with respect to the common mode inductance element 100. The ground line 150 is opposite to the winding direction of each power line 120, 130, and is a different name terminal from the input terminal of the adjacent power line. The common mode inductance assembly 100 can significantly increase the common mode impedance of the power input of the electrical and electronic device.
It is to be understood that the common mode inductance component 100 is not limited to the above-described embodiment. In another embodiment, the common mode inductor assembly 100 further includes a third power line (not shown). The third power line is wound around the first portion 111 of the first magnetic ring 110. The winding direction of the third power line is the same as the winding direction of the first power line 130. In the present embodiment, the first power line 130, the second power line 140, and the third power line constitute a multi-phase power supply system. The first power line 130 and the third power line are phase lines. The second power line 140 is a neutral line. The first power line 130 (phase line), the second power line 140 (zero line) and the third power line (phase line) are wound around the same first magnetic ring 110 in the same direction, and the number of winding turns is the same. Common mode inductance component 100 also achieves the purpose of common mode current rejection.
According to the requirement, the common mode inductance assembly 100 also comprises a third power line and a fourth power line, which form four power lines. Four power lines form a three-phase power supply mode. It will be appreciated that the neutral wire may also be provided as required. As in the present embodiment, the first power line 130, the second power line 140, and the third power line are phase lines, and the fourth power line is a neutral line. Four power supply wires are wound around the first portion 111 of the first magnetic ring 110. The winding direction of the second power line 140, the third power line and the fourth power line is the same as the winding direction of the first power line 130.
It is understood that the common mode inductance assembly 100 may further include a base. The base is provided with corresponding terminals to lead out the terminals of the first power line 130, the second power line 140, the ground line 150, and the like. At this time, the first magnetic ring 110 and the second magnetic ring 120 may be disposed on the base by inserting, fastening, or gluing.
If necessary, the ends of the first power line 130, the second power line 140 and the ground line 150 may be provided with wire loops or terminals to facilitate the electrical connection of the common mode inductor assembly 100 with other electronic components.
Another embodiment of the present invention further provides a filter circuit, which includes the common mode inductor assembly 100 as above. As shown in fig. 6, the first end 131 of the first power line 130 in the common mode inductance assembly 100 is connected to the phase line voltage terminal L, and the second end 132 of the first power line 130 in the common mode inductance assembly 100 is connected to one end of the load. The third terminal 141 of the second power line 140 in the common mode inductance assembly 100 is connected to the neutral voltage terminal N, and the fourth terminal 142 of the second power line 140 in the common mode inductance assembly 100 is connected to the other end of the load. The fifth terminal 154 of the ground line 150 in the common mode inductance component 100 is grounded, and the sixth terminal 155 of the ground line 150 in the common mode inductance component 100 is connected to the ground terminal PE of the electronic and electrical device. As can be seen from the foregoing analysis, the first segment 151 of the ground wire 150 and the first and second power wires 130 and 140 are wound on the first magnetic ring 110, and the winding direction of the first segment 151 of the ground wire 150 is opposite to the winding direction of the first and second power wires 130 and 140. The magnetic field induced in the first magnetic ring 110 by the common mode interference signal current in the ground line 150 and the magnetic field induced in the first magnetic ring 110 by the first power line 130 and the second power line 140 are superimposed, so that the common mode inductance assembly 100 has a larger alternating current impedance with respect to the common mode signal current, thereby playing a role in filtering the common mode interference signal current in the electrical and electronic device. That is, since the common mode inductance assembly 100 has a high common mode impedance, the filter circuit can effectively filter the common mode interference signal current during the operation of the electrical and electronic device. In addition, since the second segment 152 of the ground wire 150 in the common mode inductance assembly 100 is wound on the second magnetic core 120, a filtering effect on high-frequency interference signals can be achieved. That is, since the common mode inductance assembly 100 has a high common mode impedance and gives consideration to the common mode signal filtering function of the low frequency band and the high frequency band, the corresponding filter circuit can also effectively filter the common mode interference signal in the working process of the electronic and electrical equipment, and give consideration to the common mode signal filtering function of the low frequency band and the high frequency band.
The filter circuit may further include a first capacitor C1 and a second capacitor C2, as desired. One end of the first capacitor C1 is connected to the first end 131 of the first power line 130, and the other end of the first capacitor C1 is connected to the third end 141 of the second power line 140. One end of the second capacitor C2 is connected to the second end 132 of the first power line 130, and the other end of the second capacitor C2 is connected to the fourth end 142 of the second power line 140. The first capacitor C1 and the second capacitor C2 are used for filtering the series-mode signal interference at the input end and the output end respectively. The first capacitor C1 and the second capacitor C2 may be thin film capacitors (ampere-rated X capacitors) as required, and the capacitance range may be selected from 0.01 μ F to 3.3 μ F.
The filter circuit may further include a third capacitor C3 and a fourth capacitor C4, as desired. One end of the third capacitor C3 is connected to the second end 122 of the first power line 130, and the other end of the third capacitor C3 is connected to the ground protection end PE of the electronic and electrical device. One end of the fourth capacitor C4 is connected to the fourth terminal 142 of the second power line 140, and the other end of the fourth capacitor C4 is connected to the ground protection terminal PE of the electronic and electrical device. The third capacitor C3 and the fourth capacitor C4 are mainly used for filtering out common mode signal interference. The third capacitor C3 and the fourth capacitor C4 can be selected from safety Y capacitors according to requirements, and the capacity range is 470 PF-0.01 muF.
It is to be understood that, in the filter circuit, the common mode inductance component 100 may also include a third power line or a fourth power line. In this case, the specific structure of the filter circuit may also be adjusted according to actual needs.
It is understood that one or more common mode inductance components 100 may be disposed in the filter circuit according to actual needs, so as to implement single-stage filtering or multi-stage filtering to meet the requirement of electromagnetic compatibility under different conditions.
Another embodiment of the present invention further provides a household air conditioner, which includes the common mode inductor assembly 100 according to any one of the above embodiments. By arranging the common mode inductance assembly 100 on the household air conditioner, the common mode current generated by the household air conditioner in the working process can be effectively inhibited by the common mode inductance assembly 100 because the common mode inductance assembly 100 has higher common mode impedance and can give consideration to high-frequency and low-frequency filtering common modes. The common mode inductor assembly 100 may also be applied to a household appliance such as a refrigerator, a microwave oven, a rice cooker, etc., as required, and is not particularly limited herein.
In fact, when the common mode inductor assembly 100 provided by the embodiment of the invention is installed on a household air conditioner, the EMI (electromagnetic interference) test result is significantly better than that of the conventional common mode inductor.
Fig. 7 and 8 show the EMI test results of the conventional common mode inductor assembly. As can be seen from FIG. 7, the disturbance voltage tested by the conventional common mode inductor component (the phase line L and the zero line N are wound on the amorphous magnetic ring for 4 circles, and the ground line PE is not wound, wherein the size of the amorphous magnetic ring is 28mm in outer diameter, 18mm in inner diameter and 10mm in height), the quasi peak value of the disturbance voltage in the low frequency band (154KHz) is 65.00dB muV, and the average value is 61.04dB muV; the quasi-peak value in the high frequency band (22.606MHz) was 47.20dB μ V, with an average of 41.39dB μ V. As can be seen from FIG. 8, the quasi-peak value of the tested disturbance power in the frequency range around 30MHz is 41.92dBpW, and the average value is 36.72 dBpW; the quasi-peak at 66MHz was 39.68dBpW with an average of 29.04 dBpW.
Please refer to fig. 9 and fig. 10, which are EMI test results of the common mode inductor assembly according to the embodiment of the present invention. As can be seen from FIG. 9, the common mode inductance component provided by the embodiment of the invention (the phase line L and the zero line N are wound on the amorphous magnetic ring for 3 circles, the ground line PE is wound on the amorphous magnetic ring for 2 circles in the opposite direction, and then is connected in series with the nickel-zinc magnetic ring for 4 circles, wherein the size of the amorphous magnetic ring is 28mm in outer diameter, 18mm in inner diameter and 10mm in height, the size of the nickel-zinc magnetic ring is 16mm in outer diameter, 10mm in inner diameter and 8mm in height), the quasi-peak value of the tested disturbance voltage in a low frequency band (158KHz) is 55.38dB μ V, and the average value is 50.32dB μ V; the quasi-peak value in the high frequency band (25.262MHz) was 41.59dB μ V. As can be seen from fig. 10, the quasi-peak value of the tested disturbance power in the frequency range around 32MHz is 38.24dBpW, and the average value is 29.32 dBpW. Therefore, the common mode inductance assembly provided by the embodiment of the invention has the EMI test data which are obviously superior to that of the traditional common mode inductance assembly.
It should be noted that the above-mentioned embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above-mentioned embodiments, and any other changes, modifications, substitutions, combinations and simplifications which do not depart from the spirit and principle of the present invention should be regarded as equivalent substitutions and are included in the protection scope of the present invention.

Claims (10)

1. A common mode inductance assembly, comprising:
the magnetic circuit comprises a first magnetic ring and a second magnetic ring, wherein the diameter of the first magnetic ring is larger than that of the second magnetic ring;
the first power line and the second power line are wound on the first magnetic ring and form a common-mode inductor;
the ground wire comprises a first section and a second section, the first section of the ground wire is wound on the first magnetic ring, magnetic flux generated by the first section of the ground wire in the working process is superposed with magnetic flux generated by the first power line in the working process in a same phase, and the second section of the ground wire is wound on the second magnetic ring.
2. The common mode inductance component of claim 1,
the first magnetic ring comprises a first part and a second part;
the first power line and the second power line are wound on the first part of the first magnetic ring, and the winding directions of the first power line and the second power line are the same;
the first section of the ground wire is wound on the second part of the first magnetic ring, and the winding direction of the first section of the ground wire is opposite to the winding direction of the first power line.
3. A common mode inductor assembly as claimed in claim 2 wherein the second magnetic loop is attached to the second portion of the first magnetic loop.
4. The common mode inductor assembly as claimed in claim 2, wherein the ground line further comprises a third segment, the second segment of the ground line is located between the first segment and the third segment of the ground line, the third segment of the ground line is wound around the second portion of the first magnetic ring, and a winding direction of the third segment of the ground line is opposite to a winding direction of the first power line.
5. A common-mode inductance assembly according to any one of claims 1-4,
the first magnetic ring is made of one or more of amorphous materials, manganese zinc materials or nickel zinc materials;
and/or the second magnetic ring is made of a nickel-zinc material.
6. A common-mode inductive component according to any one of claims 1 to 4, characterized in that said first power line and said second power line constitute a single-phase power supply, said first power line being a phase line and said second power line being a neutral line.
7. A common-mode inductance assembly according to any one of claims 1-4,
the number of turns of the first section of the ground wire in the first magnetic ring is smaller than that of the first power line in the first magnetic ring;
and/or the number of winding turns of the second section of the ground wire on the second magnetic ring is larger than that of the first section of the ground wire on the first magnetic ring.
8. A common mode inductor assembly according to any one of claims 1 to 4 further comprising a heat shrink sleeve sleeved outside the first magnetic ring, the second magnetic ring, the first power line, the second power line and the ground line.
9. A filter circuit comprising a common mode inductance component according to any one of claims 1 to 8.
10. A domestic air conditioner comprising a common mode inductance assembly as claimed in any one of claims 1 to 8.
CN202110733375.9A 2021-06-29 2021-06-29 Common mode inductance assembly, filter circuit and household air conditioner Pending CN113314320A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110733375.9A CN113314320A (en) 2021-06-29 2021-06-29 Common mode inductance assembly, filter circuit and household air conditioner

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110733375.9A CN113314320A (en) 2021-06-29 2021-06-29 Common mode inductance assembly, filter circuit and household air conditioner

Publications (1)

Publication Number Publication Date
CN113314320A true CN113314320A (en) 2021-08-27

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202110733375.9A Pending CN113314320A (en) 2021-06-29 2021-06-29 Common mode inductance assembly, filter circuit and household air conditioner

Country Status (1)

Country Link
CN (1) CN113314320A (en)

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