CN113314320B - Common mode inductor components, filter circuits and household air conditioners - Google Patents
Common mode inductor components, filter circuits and household air conditioners Download PDFInfo
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- CN113314320B CN113314320B CN202110733375.9A CN202110733375A CN113314320B CN 113314320 B CN113314320 B CN 113314320B CN 202110733375 A CN202110733375 A CN 202110733375A CN 113314320 B CN113314320 B CN 113314320B
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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
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- 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
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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
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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
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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
- H01F27/38—Auxiliary core members; Auxiliary coils or windings
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- 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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- Power Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Filters And Equalizers (AREA)
- Coils Or Transformers For Communication (AREA)
Abstract
The invention discloses a common mode inductance component, 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 line. 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 inductance. The ground wire includes a first section and a second section. The first section of the ground wire is wound on the first magnetic ring. The magnetic flux generated by the first section of the ground wire during operation is superimposed with the magnetic flux generated by the first power wire 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
Technical Field
The invention relates to the technical field of electromagnetic compatibility, in particular to a common mode inductance component, a filter circuit and a household air conditioner.
Background
In electronic and electrical devices, in order to meet the requirements of electromagnetic compatibility (EMC, electro Magnetic Compatibility), a magnetic ring is usually disposed on a power line, and the power line is wound on the magnetic ring to filter out common-mode interference signals. However, the current power line filtering is limited by the inner diameter of the magnetic core, and the common mode impedance of the current power line filtering cannot be improved by increasing the number of turns or the size of the magnetic ring at a certain volume and inner diameter. In addition, the filtering frequency band of the power line with the magnetic ring is also narrower.
Disclosure of Invention
Based on the above problems, the embodiment of the invention provides a common-mode inductance component, which aims to solve the problems that the common-mode impedance of the conventional common-mode inductance component is insufficient and the filtering frequency band is narrower.
The embodiment of the invention provides a common mode inductance assembly, which comprises:
the device 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 first section of the ground wire is wound on the first magnetic ring, magnetic flux generated in the working process of the first section of the ground wire is overlapped with magnetic flux generated in the working process of the first power wire in phase, and the second section of the ground wire is wound on the second magnetic ring.
In the common-mode inductance assembly provided by the embodiment of the invention, the first section of the ground wire, the first power wire and the second power wire are wound on the first magnetic ring, and magnetic flux generated by the first section of the ground wire in the working process is overlapped with magnetic flux generated by the first power wire in the working process, so that the common-mode impedance of the common-mode inductance is effectively increased. That is, the first segment of the ground wire disposed 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 device 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 inhibit the high-frequency interference signal 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 (150 KHz-5 MHz), and the common-mode interference signals of a high frequency band (30 MHz-50 MHz) can be filtered in a mode that the second section of the ground wire is wound on the second magnetic ring. That is, the common mode inductance component can filter interference signals of high frequency band and low frequency band simultaneously, so as to effectively improve EMC performance of electronic and electric equipment.
In an embodiment, the first magnetic ring includes 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 wire.
The first section of the ground wire, the first power wire and the second power wire are wound on 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 wire and the second power wire. In the working process, the first section of the ground wire and the power wire are positioned in the same magnetic core and are in anti-phase coupling, and common-mode current is in opposite directions in the first section of the ground wire and the power wire, so that the common-mode impedance of the common-mode inductance component can be obviously increased by the arrangement mode of the ground wire, and common-mode interference current in electronic and electric equipment is effectively restrained.
In one embodiment, the second magnetic ring is attached to a second portion of the first magnetic ring. The first magnetic ring and the second magnetic ring are formed as a unit 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 line and the like in the same heat-shrinkable sleeve.
In an embodiment, the ground wire further includes a third section, the second section of the ground wire is located between the first section and the third section of the ground wire, the third section of the ground wire is wound on the second portion of the first magnetic ring, and a winding direction of the third section of the ground wire is opposite to a winding direction of the first power wire. 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 wire, so that the common mode impedance of the common mode inductance component can be obviously increased, and common mode interference current in electronic and electric equipment can be effectively restrained. In addition, since the second section of the ground wire is located between the first section and the third section of the ground wire, the above arrangement mode can temporarily form the first magnetic ring and the second magnetic ring into a whole, so that the subsequent assembly process is facilitated.
In an embodiment, the manufacturing material of the first magnetic ring includes one or more of amorphous material, manganese-zinc material or nickel-zinc material;
and/or the manufacturing material of the second magnetic ring comprises nickel-zinc material.
The first magnetic ring is not limited in the kind of manufacturing material, and may be an amorphous material, a manganese-zinc material or a nickel-zinc material. Different materials are typically chosen depending on the frequency band and radiation characteristics of the disturbance. The second magnetic ring is made of nickel-zinc material, and the interference of common mode signals in a high frequency band can be effectively filtered out due to the fact that the nickel-zinc material has the characteristics of high frequency, wide frequency band, high impedance and low loss.
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 the embodiment, the first power line (phase line) and the second power line (zero line) are wound on the 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 reverse magnetic fields in the inductance coils wound in the same phase to cancel each other. Therefore, the differential mode impedance of the common mode inductance component is low, and has little influence on normal operating current. When the interference current (common mode current) in the circuit flows through the common mode inductance component, due to the isotropy of the common mode current, a magnetic field in the same direction is generated in the common mode inductance component to increase the inductance of the coil, so that the common mode inductance component is shown to have higher common mode impedance.
In an embodiment, the number of turns of the first section of the ground wire wound on the first magnetic ring is smaller than the number of turns of the first power wire wound on the first magnetic ring;
And/or the winding turns of the second section of the ground wire on the second magnetic ring is larger than the winding turns of the first section of the ground wire on the first magnetic ring.
By setting the number of winding turns of the first section of the ground wire in the first magnetic ring to be smaller than the number of winding turns of the first power wire in the first magnetic ring, at this time, the common mode impedance of the common mode inductance assembly can be increased without greatly affecting the operation performance of the common mode inductance formed by the first power wire and the second power wire. In addition, as the first section and the second section of the ground wire are arranged on the first magnetic ring and the second magnetic ring respectively, the winding turn number 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, and the performance of the ground wire for filtering high-frequency interference signals is improved.
In an embodiment, the common mode inductance assembly further comprises 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. Through the first magnetic ring, the second magnetic ring, the first power line, the second power line and the outside cover of ground wire establish the heat shrinkage bush, the heat shrinkage bush can make common mode inductance assembly form a whole to follow-up installation and use are convenient.
Another embodiment of the present invention also provides a filter circuit, including a common mode inductance assembly according to any one of the above embodiments. By arranging the common-mode inductance component on the filter circuit, the filter circuit can effectively filter common-mode interference signal current in the working process of electronic and electric equipment because the common-mode inductance component has higher common-mode impedance and has the common-mode signal filtering function of both low frequency band and high frequency band.
Still another embodiment of the present invention provides a household air conditioner, including a common mode inductance assembly according to any one of the above embodiments. Through setting up common mode inductance subassembly on the domestic air conditioner, because common mode inductance subassembly has higher common mode impedance and compromise the common mode signal filtering function of low frequency channel and high frequency channel simultaneously, filter circuit can filter common mode interference signal current effectively in electronic and electrical equipment's course of working.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained according to these drawings without inventive faculty for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a common-mode inductance component according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of another view of the common-mode inductance assembly in fig. 1.
Fig. 3 is a schematic structural diagram of another view of the common-mode inductance assembly in fig. 1.
Fig. 4 is a schematic structural diagram of a common-mode inductance component according to another embodiment of the invention.
Fig. 5 is a schematic diagram of a current loop of an application circuit having the common-mode inductance assembly of fig. 1 when generating a differential mode current or a common-mode current.
Fig. 6 is a schematic diagram of a filter circuit having the common mode inductance component of fig. 1.
Fig. 7 is a graph showing disturbance voltage data obtained during EMI testing of a conventional common mode inductor assembly.
Fig. 8 is harassment power data obtained during EMI testing of a conventional common mode inductor assembly.
Fig. 9 is disturbance voltage data obtained during an EMI test of a common mode inductor assembly according to an embodiment of the present invention.
Fig. 10 is disturbance power data obtained during an EMI test of a common mode inductor assembly according to an embodiment of the present invention.
Reference numerals illustrate:
| Reference numerals | Name of the name | Reference numerals | Name of the name |
| 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 section | 151 | Second section | 152 |
| Third section | 153 | First part | 111 |
| Second part | 112 | Heat-shrinkable sleeve | 160 |
| First end | 131 | Second end | 132 |
| Third end | 141 | Fourth end | 142 |
| One end is provided with | 154 | The other end is provided with | 155 |
| First capacitor | C1 | Second capacitor | C2 |
| Third capacitor | C3 | Fourth capacitor | C4 |
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that, if directional indications (such as up, down, left, right, front, and rear are referred to in the embodiments of the present invention), the directional indications are merely used to explain the relative positional relationship, movement conditions, and the like between the components in a specific posture, and if the specific posture is changed, the directional indications are correspondingly changed.
In addition, if there is a description of "first", "second", etc. in the embodiments 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 a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, if "and/or" and/or "are used throughout, the meaning includes three parallel schemes, for example," a and/or B "including a scheme, or B scheme, or a scheme where a and B are satisfied simultaneously. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.
Referring to fig. 1 and 2, an embodiment of the present invention provides a common mode inductance assembly 100, which includes a first magnetic loop 110, a second magnetic loop 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 the diameter 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 12mm. The second magnetic ring 120 has an outer diameter of 16mm, an inner diameter of 10mm, and a thickness of 10mm. It will be appreciated that the first magnetic ring 110 and the second magnetic ring 120 may be of other sizes, which may be set according to the specific requirements of the 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 inductance.
The ground wire 150 includes a first segment 151 and a second segment 152. The first section 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 wire 150 during operation is superimposed with the magnetic flux generated by the first power wire 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, the first power wire 130 and the second power wire 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 with the magnetic flux generated by the first power wire 130 during operation, so that the common mode impedance of the common mode inductance assembly 100 is effectively increased. 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 disturbance current in the electronic and electrical device can be effectively suppressed. Further, by wrapping the second section 152 of the ground wire 150 over the second magnetic ring 120, the diameter of the first magnetic ring 110 is made larger than the diameter of the second magnetic ring 120. The winding manner of the second section 152 of the ground wire 150 can effectively suppress the high-frequency interference signal of the radiation loop of the ground wire 150. It can be seen that in the common mode inductance assembly 100, the first section 151 of the ground wire 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 (150 KHz-5 MHz). The second section 152 of the ground wire 150 is wound on the second magnetic ring 120 to filter out common mode interference signals in the high frequency band (30 MHz-50 MHz). That is, the common-mode inductance assembly 100 can filter the interference signals of the high frequency band and the low frequency band at the same time, so as to effectively improve the EMC performance of the electronic and electrical equipment.
Referring to fig. 3, specifically, the magnetic flux generated by the first power line 130 during operation is Φ1, the magnetic flux generated by the second power line 140 during operation is Φ2, and the magnetic flux generated by the first segment 151 of the ground line 150 during operation is Φ3. The first power line 130 and the second power line 140 have the same winding direction and the same number of turns on the first magnetic ring 110. When common mode current is in and out of the first power line 130 and the second power line 140, the magnetic flux Φ1 generated by the first power line 130 and the magnetic flux Φ2 generated by the second power line 140 are superimposed in phase. Since the winding direction of the first section of the ground wire 150 on the first magnetic ring 110 is opposite to the winding direction of the first power wire 130 on the first magnetic ring 110, if the interference voltage exists at the power input terminal, the common mode current taking the ground wire 150 as the return path forms a closed loop between the first power wire 130 and the ground wire 150, and forms a closed loop between the second power wire 140 and the ground wire 150. Since 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 Φ3 generated by the first segment 151 of the ground line 150 during operation is also in phase with the magnetic flux Φ1 generated by the first power line 130 or the magnetic flux Φ2 generated by the second power line 140. At this time, the magnetic flux Φ1 generated by the first power line 130, the magnetic flux Φ2 generated by the second power line 140, and the magnetic flux Φ3 generated by the first segment 151 of the ground line 150 are superimposed in phase, so as to increase the common-mode inductance of each coil, thereby increasing the common-mode impedance of the common-mode inductance formed by the first power line 130 and the second power line 140. 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 effect 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 ring shape to form a closed magnetic circuit. The first magnetic ring 110 and the second magnetic ring 120 may be arranged in a manner that reduces the occurrence of magnetic leakage. 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 in a semicircular shape, which together form the whole of the first magnetic ring 110. The first portion 111 and the second portion 112 may be disposed on the upper and lower portions of the first magnetic ring 110, or may be disposed on the left and right portions of the first magnetic ring 110, as required, and those skilled in the art may be disposed according to specific requirements of the product. The 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, as needed. In particular, the insulating member may be one or more of an insulating heat shrink, an insulating plastic film, or an insulating paint. By providing the insulating member 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, it is possible to prevent the first power line 130 and the second power line 140 from forming an electrical connection with the first magnetic ring 110, thereby causing the functional failure of the common mode inductance assembly 100. The first magnetic ring 110 may be made of one or more of amorphous material, manganese-zinc material, and nickel-zinc material, as required. The second magnetic ring 120 is made of nickel-zinc material according to needs. 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. In general, the first magnetic ring 110 may be made of amorphous material, manganese-zinc material, or nickel-zinc material, without limitation. Different materials are typically chosen depending on the frequency band and radiation characteristics of the disturbance. The second magnetic ring 120 is made of nickel-zinc material. The nickel-zinc material has the characteristics of high frequency, wide frequency band, high impedance and low loss. The second magnetic ring 120 is made of nickel-zinc material, so that interference of common mode signals in high frequency band can be effectively filtered. Generally, the first magnetic ring 110 should be made of a material with suitable magnetic permeability, so as to avoid that the first magnetic ring 110 enters a saturated state to affect the performance of the common-mode inductance assembly 100 for filtering common-mode interference signals in an actual working process. The shape of the first magnetic ring 110 may also be an oval shape, a racetrack shape, or a polygonal ring shape, as required, which may be determined according to the actual requirements of the product, and is not particularly limited herein.
Specifically, the first power cord 130 is wound around the first portion 111 of the first magnetic ring 110. The second power cord 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 first power cord 130 and the second power cord 140 are wound in a clockwise direction from the outside (the direction facing the observer) of the first magnetic ring 110 to the inside (the direction facing away from the observer) of the first magnetic ring 110 in the left-to-right direction. 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 wound on the first portion 111 of the first magnetic ring 110 at the same time in the actual manufacturing process, so as to simplify the manufacturing process. It will be appreciated that the outer surfaces of the first and second power lines 130 and 140 may be provided with an insulating sheath, an insulating film, or an insulating paint so that the first and second power lines 130 and 140 are not conducted to each other when wound around the first portion 111 of the first magnetic ring 110. Meanwhile, the insulating cover, the insulating film, or the insulating paint may also prevent the first and second power lines 130 and 140 from forming an electrical connection with 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 breakdown short circuit does not occur between the first power line 130 and the second power line under the action of an instantaneous overvoltage. The first power line 130 and the second power line 140 are also used to reduce the parasitic capacitance between the coils in a manner of winding the single-layer coils as much as possible according to the requirement.
The first segment 151 of the ground wire 150 is wound around the second portion 112 of the first magnetic loop 110. The winding direction of the first segment 151 of the ground wire 150 is opposite to the winding direction of the first power wire 130. Specifically, in the present embodiment, the first segment 151 of the ground wire 150 is wound in a counterclockwise direction from the outside (the direction facing the observer) of the first magnetic ring 110 to the inside (the direction facing away from the observer) of the first magnetic ring 110 in the left-to-right direction in the top region of the first magnetic ring 110. The first power line 130 and the second power line 140 may be wound in a clockwise direction from the inner side (facing away from the observer) of the first magnetic ring 110 to the outer side (facing toward the observer) of the first magnetic ring 110 in a left-to-right direction, and the ground line 150 may be wound in a counterclockwise direction from the inner side (facing away from the observer) of the first magnetic ring 110 to the outer side (facing toward the observer) of the first magnetic ring 110 in a left-to-right direction in a bottom region of the first magnetic ring 110, as needed. As long as it is possible to realize the winding direction of the first segment 151 of the ground wire 150 opposite to the winding direction of the first power wire 130. Specifically, the ground line 150 refers to a wire connecting the power input terminal to the ground for safety requirements of the electronic and electric equipment. An insulating sleeve, insulating film or insulating paint may be provided on the outer surface of the ground wire 150 as needed to avoid the ground wire 150 from making electrical connection with the first magnetic ring 110. The ground wire 150 also winds the single-layer coil as much as possible according to the requirement, so as to reduce the parasitic capacitance between the coils.
That is, by winding the first section 151 of the ground wire 150 and the first and second power lines 130 and 140 on the first magnetic ring 110, the winding direction of the first section 151 of the ground wire 150 is made opposite to the winding direction of the first and second power lines 130 and 140. In the operation process, the first section 151 of the ground wire 150 is in anti-phase coupling with the first magnetic ring 110 and the second power wire 130 and 140, and the common mode current is in opposite directions in the first section 151 of the ground wire 150 and the first power wire 130 and the second power wire 140, so that the arrangement mode of the first section 151 of the ground wire 150 can obviously increase the common mode impedance of the common mode inductance assembly 100, thereby effectively inhibiting the common mode interference current in the electronic electrical equipment.
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 will form a single piece for subsequent assembly or operation. For example, when the common-mode inductance assembly 100 is required to be sleeved inside the heat-shrinkable sleeve later, the structure that the first magnetic ring 110 and the second magnetic ring 120 are attached together facilitates the sleeving of 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.
In one embodiment, the ground wire 150 further includes a third section 153, as shown in fig. 4. The second section 152 of the ground wire 150 is located between the first section 151 and the third section 153 of the ground wire 150. The third section 153 of the ground wire 150 is wound around the second portion 112 of the first magnetic ring 110. The third section 153 of the ground wire 150 is wound in a direction opposite to the first power wire 130. By winding the third section 153 of the ground wire 150 around the first magnetic ring 110 in a direction opposite to the winding direction of the first power wire 130. The third section 153 of the ground line 150 can also significantly increase the common mode impedance of the common mode inductor assembly 100, thereby effectively suppressing common mode disturbance currents in the electronic and electrical devices. In addition, since the second section 152 of the ground wire 150 is located between the first section 151 and the third section 153 of the ground wire 150, the above arrangement can temporarily form the first magnetic ring 110 and the second magnetic ring 120 into a whole, so as to facilitate the subsequent assembly process. That is, since the first section 151 and the third section 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 assembly process.
In one embodiment, the first power line 130 and the second power line 140 form 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 zero line and is connected to a zero line 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 normal operating current (differential mode current) in the circuit flows through the common mode inductor assembly 100, the operating currents generate opposing magnetic fields in the in-phase wound inductor coils that cancel each other out. That is, the differential mode impedance of the common mode inductor assembly 100 is low, with little impact on normal operating current. When the interference current (common mode current) in the circuit flows through the common mode inductance component 100, due to the same direction of the common mode current, a magnetic field in the common mode inductance component 100 is generated to increase the inductance of the coil, so that the common mode inductance component 100 has a higher common mode impedance characteristic, and the function of filtering the common mode interference signal current is achieved.
In one embodiment, the number of windings of the first segment 151 of the ground wire 150 on the first magnetic ring 110 is smaller than the number of windings of the first power wire 130 on the first magnetic ring 110. If necessary, the number of winding turns of the second section 152 of the ground wire 150 in the second magnetic ring 120 is greater than the number of winding turns of the first section 151 of the ground wire 150 in 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 4 times. The first segment 151 of the ground wire 150 is wound 1 turn on the first magnetic loop 110. A second section 152 of the ground wire 150 is wound 5 turns on the second magnetic loop 120. In a specific winding process, the first power line 130 and the second power line 140 may be wound on the first magnetic ring 110 for 4 turns at the same time, then the second section 152 of the ground line 150 is wound on the second magnetic ring 120 for 5 turns, and finally the first section 151 of the ground line 150 is wound on the first magnetic ring 110 for 1 turn in a reverse direction, so that the first magnetic ring 110 and the second magnetic ring 120 are combined together.
By setting the number of windings of the first segment 151 of the ground line 150 in the first magnetic ring 110 to be smaller than the number of windings of the first power line 130 in the first magnetic ring 110, at this time, the common mode impedance of the common mode inductance assembly 100 can be increased without greatly affecting the operation performance of the common mode inductance 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 separately disposed on the first magnetic ring 110 and the second magnetic ring 120, the winding number of the second segment 152 of the ground wire 150 on the second magnetic ring 120 is set to be greater than the winding number of the first segment 151 of the ground wire 150 on the first magnetic ring 110, which is helpful to improve the performance of the ground wire 150 for filtering high-frequency interference signals.
In one embodiment, the common mode inductor assembly 100 further includes a heat shrink 160. The heat shrinkage 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 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, the heat-shrinkable sleeve 160 can form the common-mode inductance assembly 100 into a whole, so that the subsequent installation and use are convenient. 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, so that the heat shrink 160 is shrunk, thereby forming the common mode inductance assembly 100 into a whole.
The common mode inductance assembly 100 operates as follows:
In the working process of the electronic and electric equipment, common mode coupling paths exist among a current round trip path in a current loop, an anode and a cathode of an electronic device and a ground wire, so that a common mode interference signal is generated. Common mode interference signals are generally equal in amplitude and phase on each current round trip.
Referring to fig. 5, in order to reduce the influence of the common mode interference signal on the load, a common mode inductance component 100 is typically 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 terminal as an example, the single-phase power input terminal comprises a phase line voltage terminal L and a zero line voltage terminal N. The first end 131 of the first power line 130 is connected to the phase line voltage end L, the third 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 fourth end 142 of the second power line 140 is connected to the other end of the load.
For the differential mode current I DMN, since the magnetic flux generated by the inductor L CM1 in the first power supply line 130 is opposite to the magnetic flux generated by the inductor L CM2 in the second power supply line 140, the magnetic flux Φ1 generated by the inductor L CM1 and the magnetic flux Φ2 generated by the inductor L CM2 cancel each other, so that the differential mode impedance of the common mode inductance formed by the first power supply line 130 and the second power supply line 140 is close to zero.
For the common mode current I CMN, since the magnetic flux generated by the inductor L CM1 in the first power line 130 and the magnetic flux generated by the inductor L CM2 in the second power line 140 are in the same direction, the magnetic flux Φ1 generated by the inductor L CM1 and the magnetic flux Φ2 generated by the inductor L CM2 are mutually enhanced, so that the common mode impedance of the common mode inductor formed by the first power line 130 and the second power line 140 is larger. Meanwhile, since the winding direction of the inductor L G in the ground line 150 is opposite to that of the inductor L CM1 in the first power line 130, the magnetic flux generated by the inductor L G in the ground line 150 is in the same direction as that generated by the inductor L CM1 in the first power line 130, so that the common mode impedance of the common mode inductor formed by the first power line 130 and the second power line 140 is further increased.
Specifically, taking the signal current in the first power line 130 as a positive example, assuming that the differential mode current I DMN Is in the same direction as the signal current Is on the first power line 130, the total current I 1＝Is+IDMN in the first power line 130 and the total current I 2＝-Is+IDMN in the second power line 140. Wherein Is the magnitude of the signal current, and I DMN Is the magnitude of the differential mode current. That is, the magnetic fields induced by the first power line 130 and the second power line 140 in the first magnetic ring 110 are equal in magnitude and opposite in direction, and cancel each other out. Therefore, the signal current Is subjected to a small inductance in the common-mode inductance component 100, and the differential-mode attenuation in the signal loop Is small.
For the common-mode interference signals in the first power line 130 and the second power line 140, the common-mode currents I CMN formed are equal in size and identical in phase, so that in-phase superimposed magnetic fields are induced in the first magnetic ring 110, and the common-mode current I CMN is subjected to larger alternating-current impedance, so that the effect of filtering the common-mode interference signal currents is achieved.
The common mode ac impedance formed by the first power line 130 and the second power line 140 is not yet high enough for some specific applications. Therefore, in the common-mode inductance assembly 100 provided by the embodiment of the present invention, the first section 151 of the ground wire 150 and the first power wire 130 and the second power wire 140 are wound on the first magnetic ring 110, and the winding direction of the first section 151 of the ground wire 150 is opposite to the winding direction of the first power wire 130 and the second power wire 140. Thus, during operation, the total current I PE = Ic flowing through ground 150. That is, the magnetic field induced by the common mode interference signal current Ic in the ground wire 150 in the first magnetic loop 110 and the magnetic fields induced by the first power line 130 and the second power line 140 in the first magnetic loop 110 are superimposed, so that the common mode inductance assembly 100 has a larger ac impedance with respect to the common mode signal current, and thus functions to filter out the common mode interference signal current in the electronic and electrical device. On the other hand, since 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 that 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 out the interference signals in the high frequency band, so that the common mode inductance assembly 100 can simultaneously filter out the low frequency common mode interference signals and filter out the high frequency common mode interference signals.
It can be appreciated that the first end 131 of the first power line 130 is disposed adjacent to the third end 141 of the second power line 140 and is the same name as each other. The second end 132 of the first power line 130 is disposed adjacent to the fourth end 142 of the second power line 140 and is the same name. Since the first end 131 and the third end 141 are disposed adjacent to each other and are the same name as each other, the second end 132 and the fourth end 142 are disposed adjacent to each other and are the same name as each other. When a common mode current flows through the common mode inductance assembly 100, due to the same direction of the common mode current, a magnetic field in the same direction is generated in the common mode inductance assembly 100 to increase the inductance of the coil, which is shown as a higher common mode impedance. Specifically, the homonymous terminal and the heteronymous terminal refer to terminals with the same polarity of induced electromotive force as the homonymous terminal under the action of the same changing magnetic flux, and terminals with opposite polarity of induced electromotive force as the heteronymous terminal. Above the drawing of the drawing file, a set of homonymous ends are usually marked with the symbol "·".
It will be appreciated that the fifth end 154 of the first section 151 of the ground wire 150 is disposed adjacent to the first end 131 of the first power wire 130 and the third end 141 of the second power wire 140 and is a distinct end 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 mutually different name ends. Since the fifth end 154 of the ground wire 150 is disposed adjacent to the first end 131 and is a mutually different-named end, the connecting ends of the first and second sections 151, 152 of the ground wire 150 are disposed adjacent to the second end 132 and are mutually different-named ends. When a common mode current flows through the common mode inductance assembly 100, the common mode interference current between the power supply lines 130, 140 and the ground line 150 corresponds to a differential mode current with respect to the common mode inductance assembly 100. Because the ground wire 150 is wound in the opposite direction to the power wires 130, 140 and is a different name from the input end of the adjacent power wire. The common mode inductance assembly 100 can significantly increase the common mode impedance of the power input terminals of the electronic and electrical devices.
It will be appreciated that the common mode inductance assembly 100 is not limited to the above-described embodiments. In another embodiment, common mode inductor assembly 100 further includes a third power supply 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 multiphase power supply mode. The first power line 130 and the third power line are phase lines. The second power line 140 is a zero line. By winding the first power line 130 (phase line), the second power line 140 (neutral line) and the third power line (phase line) in the same direction around the same first magnetic ring 110, the number of turns around the same is the same. Common mode inductor assembly 100 also achieves the objective of suppressing common mode current.
The common mode inductance assembly 100 also includes a third power line and a fourth power line, as needed, to form four power lines. Four power lines form a three-phase power supply mode. It will be appreciated that the zero line may also be provided as desired. 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 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 will be appreciated that the common mode inductor assembly 100 may also include a base. The base is provided with corresponding terminals to draw 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 plugging, buckling, or gluing.
The ends of the first power line 130, the second power line 140, and the ground line 150 may be provided with a connection ring or a terminal, as needed, to facilitate the electrical connection of the common mode inductance assembly 100 with other electronic components.
Another embodiment of the present invention also provides a filter circuit including the common mode inductance assembly 100 as above. As shown in fig. 6, a first end 131 of the first power line 130 in the common mode inductance assembly 100 is connected to the phase line voltage end L, and a 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 end 154 of the ground line 150 in the common mode inductance assembly 100 is grounded, and the sixth end 155 of the ground line 150 in the common mode inductance assembly 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, such that 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 by the common mode interference signal current in the ground wire 150 in the first magnetic ring 110 and the magnetic fields induced by the first power line 130 and the second power line 140 in the first magnetic ring 110 are overlapped with each other, so that the common mode inductance assembly 100 has a larger alternating current impedance relative to the common mode signal current, and plays a role in filtering the common mode interference signal current in the electronic and electric equipment. That is, since the common-mode inductance assembly 100 has a high common-mode impedance, the filtering circuit can effectively filter the common-mode interference signal current during the operation of the electronic and electric device. In addition, since the second section 152 of the ground wire 150 in the common mode inductance assembly 100 is wound on the second magnetic ring 120, a filtering effect on the high frequency interference signal can be achieved. That is, since the common-mode inductance assembly 100 has a high common-mode impedance and also has the common-mode signal filtering function of both the low-frequency band and the high-frequency band, the corresponding filtering circuit can also effectively filter the common-mode interference signal in the working process of the electronic and electric equipment and also has the common-mode signal filtering function of both 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 needed. 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 respectively used for filtering the serial mode signal interference of the input end and the output end. According to the requirement, the first capacitor C1 and the second capacitor C2 can be thin film capacitors (safety X capacitors), and the capacity range can be selected to be 0.01 mu F-3.3 mu F.
The filter circuit may further include a third capacitor C3 and a fourth capacitor C4 as needed. One end of the third capacitor C3 is connected to the second end 132 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 electric device. One end of the fourth capacitor C4 is connected to the fourth end 142 of the second power line 140, and the other end of the fourth capacitor C4 is connected to the ground protection end PE of the electronic and electric device. The third capacitor C3 and the fourth capacitor C4 are mainly used for filtering common mode signal interference. The third capacitor C3 and the fourth capacitor C4 can be selected as safety Y capacitors according to the requirement, and the capacity range is 470 PF-0.01 mu F.
It will be appreciated that in the filter circuit, the common mode inductance assembly 100 may also include a third power supply line or a fourth power supply line. At this time, the specific structure of the filter circuit can be adjusted according to actual needs.
It will be appreciated that in the filter circuit, one or more common-mode inductance assemblies 100 may be provided according to actual needs, so as to implement single-stage filtering or multi-stage filtering, so as to meet the requirements of electromagnetic compatibility under different conditions.
Another embodiment of the present invention also provides a home air conditioner including the common mode inductance 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 suppressed by the common mode inductance assembly 100 because the common mode inductance assembly 100 has higher common mode impedance and can give consideration to the filtering common mode of high frequency and low frequency. The common mode inductance assembly 100 may be applied to household appliances such as a refrigerator, a microwave oven, a rice cooker, etc., as needed, and is not particularly limited herein.
In fact, when the common mode inductance assembly 100 provided by the embodiment of the present invention is provided on a home air conditioner, the test result of EMI (electro MAGNETIC INTERFERENCE ) is significantly superior to that of the conventional common mode inductance.
Please refer to fig. 7 and 8, which are EMI test results of a conventional common mode inductance assembly. As can be seen from FIG. 7, the conventional common-mode inductance assembly (the phase line L and the zero line N are wound on an amorphous magnetic ring for 4 circles, and the ground line PE is not wound, wherein the amorphous magnetic ring has the dimensions of 28mm in outer diameter, 18mm in inner diameter and 10mm in height), the tested disturbance voltage has a quasi-peak value of 65.00dB mu V, an average value of 61.04dB mu V and a quasi-peak value of 47.20dB mu V and an average value of 41.39dB mu V in a low frequency band (154 KHz). As can be seen from FIG. 8, the quasi-peak value of the tested disturbance power in the frequency range of about 30MHz is 41.92dBpW, the average value is 36.72dBpW, and the quasi-peak value at 66MHz is 39.68dBpW, and the average value is 29.04dBpW.
Referring to fig. 9 and 10, EMI test results of a common mode inductance assembly according to an embodiment of the invention are shown. 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 a reverse way, and then the nickel-zinc magnetic ring is wound on the amorphous 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 (158 KHz) is 55.38dB mu V, the average value is 50.32dB mu V, and the quasi peak value in a high frequency band (25.262 MHz) is 41.59 mu V. As can be seen from FIG. 10, the quasi-peak value of the tested disturbance power in the frequency range of about 32MHz is 38.24dBpW, and the average value is 29.32dBpW. Therefore, the common-mode inductance component provided by the embodiment of the invention has the advantage that the test data of the EMI is obviously superior to that of the traditional common-mode inductance component.
It should be noted that the foregoing examples are preferred embodiments of the present invention, but the embodiments of the present invention are not limited by the foregoing examples, and any other changes, modifications, substitutions, combinations, and simplifications that do not depart from the spirit and principles of the present invention should be made as equivalent substitutions, and are included in the scope of the present invention.
Claims (8)
1. A common mode inductor assembly, comprising:
the device 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 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 wire in the working process, and the second section of the ground wire is wound on the second magnetic ring;
The first magnetic ring includes a first portion and a second portion; 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 wire;
the first part and the second part are respectively arranged on the upper part and the lower part of the first magnetic ring, or the first part and the second part are respectively arranged on the left part and the right part of the first magnetic ring;
The ground wire further comprises a third section, the second section of the ground wire is located between the first section and the third section of the ground wire, the third section of the ground wire is wound on the second part of 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 wire.
2. The common mode inductance assembly of claim 1, wherein the second magnetic loop is attached to a second portion of the first magnetic loop.
3. The common mode inductance assembly of claim 1 or 2, wherein the first magnetic loop is made of a material comprising one or more of an amorphous material, a manganese zinc material, or a nickel zinc material;
and/or the manufacturing material of the second magnetic ring comprises nickel-zinc material.
4. The common mode inductance assembly of claim 1 or 2, wherein the first power supply line and the second power supply line form a single phase power supply, the first power supply line being a phase line, the second power supply line being a neutral line.
5. The common mode inductance assembly of claim 1 or 2, wherein,
The winding turns of the first section of the ground wire in the first magnetic ring are smaller than those of the first power wire in the first magnetic ring;
And/or the winding turns of the second section of the ground wire on the second magnetic ring is larger than the winding turns of the first section of the ground wire on the first magnetic ring.
6. The common mode inductance assembly of claim 1 or 2, further comprising a heat shrink sleeve sleeved outside of the first magnetic loop, the second magnetic loop, the first power cord, the second power cord, and the ground cord.
7. A filter circuit comprising a common mode inductance assembly as claimed in any one of claims 1 to 6.
8. A domestic air conditioner comprising a common mode inductance assembly as claimed in any one of claims 1 to 6.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1057372A (en) * | 1996-08-22 | 1998-03-03 | Matsushita Electric Ind Co Ltd | Ultrasonograph |
| CN210985938U (en) * | 2019-10-30 | 2020-07-10 | 珠海格力电器股份有限公司 | High-frequency EMC filter circuit and household appliance |
| CN214848137U (en) * | 2021-06-29 | 2021-11-23 | 佛山市顺德区美的电子科技有限公司 | Common mode inductance assembly, filter circuit and household air conditioner |
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| JP5387502B2 (en) * | 2010-05-21 | 2014-01-15 | Ｔｄｋ株式会社 | Coil parts and impedance adjustment method |
| CN106067778A (en) * | 2015-04-23 | 2016-11-02 | 松下知识产权经营株式会社 | Magnetism parts and electric circuit |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1057372A (en) * | 1996-08-22 | 1998-03-03 | Matsushita Electric Ind Co Ltd | Ultrasonograph |
| CN210985938U (en) * | 2019-10-30 | 2020-07-10 | 珠海格力电器股份有限公司 | High-frequency EMC filter circuit and household appliance |
| CN214848137U (en) * | 2021-06-29 | 2021-11-23 | 佛山市顺德区美的电子科技有限公司 | Common mode inductance assembly, filter circuit and household air conditioner |
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