CN115274266A - Common mode inductor and filter circuit - Google Patents

Common mode inductor and filter circuit Download PDF

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Publication number
CN115274266A
CN115274266A CN202210946279.7A CN202210946279A CN115274266A CN 115274266 A CN115274266 A CN 115274266A CN 202210946279 A CN202210946279 A CN 202210946279A CN 115274266 A CN115274266 A CN 115274266A
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CN
China
Prior art keywords
winding
live
magnetic core
ground
wound
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202210946279.7A
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Chinese (zh)
Inventor
雷云菁
吴洪清
吴勇
杨子勤
席云峰
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Gree Electric Appliances Inc of Zhuhai
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Gree Electric Appliances Inc of Zhuhai
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Gree Electric Appliances Inc of Zhuhai filed Critical Gree Electric Appliances Inc of Zhuhai
Priority to CN202210946279.7A priority Critical patent/CN115274266A/en
Publication of CN115274266A publication Critical patent/CN115274266A/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
    • H01F27/28—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
    • H01F27/306—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
    • H01F27/36—Electric or magnetic shields or screens
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters

Abstract

The invention provides a common mode inductor and a filter circuit, wherein the common mode inductor comprises a magnetic core, a ground wire winding, at least one group of live wire windings and at least one group of zero wire windings; the live wire winding is wound on the magnetic core in a first direction and is used for being connected with a power live wire; the zero line winding is wound on the magnetic core in the first direction and is used for being connected with a power supply zero line; the ground winding is wound on the magnetic core in a second direction opposite to the first direction and is used for being connected with a power supply ground. The invention can improve the common-mode interference filtering capability of the filter circuit.

Description

Common mode inductor and filter circuit
Technical Field
The invention relates to the technical field of inductors, in particular to a common-mode inductor and a filter circuit.
Background
The existing common mode inductor winding only comprises a zero line and a live wire, and in an extremely complex electromagnetic environment of a controller, because the impedance of the ground wire is too low, common mode noise of the ground wire can bypass the common mode inductor under most conditions and is radiated out through a power wire and the like, the suppression effect on the common mode noise is not obvious, and the effect of filtering common mode interference of a filter circuit is not ideal.
Disclosure of Invention
The invention provides a common mode inductor and a filter circuit, which can prevent ground wire common mode noise from bypassing the common mode inductor and improve the capability of the filter circuit for filtering common mode interference.
In a first aspect, the present invention provides a common mode inductor, where the common mode inductor includes a magnetic core, a ground winding, at least one set of live windings, and at least one set of neutral windings; the live wire winding is wound on the magnetic core in a first direction and is used for being connected with a power live wire; the zero line winding is wound on the magnetic core in the first direction and is used for being connected with a power supply zero line; the ground winding is wound on the magnetic core in a second direction opposite to the first direction and is used for being connected with a power supply ground wire.
Furthermore, the live wire winding is wound on one side of the magnetic core, the zero line winding is wound on the other side of the magnetic core relative to the live wire winding, and the ground wire winding is wound on the magnetic core and is positioned between the live wire winding and the zero line winding.
Furthermore, the live wire winding is wound on one side of the magnetic core, the ground wire winding is wound on the other side of the magnetic core relative to the live wire winding, and the zero wire winding is wound on the magnetic core and is positioned between the live wire winding and the ground wire winding.
Furthermore, the three-phase winding type power line winding and the three-phase winding type zero line winding are included.
Further, the three live wire windings are respectively a first live wire winding, a second live wire winding and a third live wire winding; the first live wire winding and the second live wire winding are wound on one side of the magnetic core, the third live wire winding and the zero line winding are wound on the other side of the magnetic core relative to the first live wire winding and the second live wire winding, and the ground wire winding is wound on the magnetic core and is located between the second live wire winding and the zero line winding.
Furthermore, the diameters and the winding turns of the live wire winding, the zero wire winding and the ground wire winding are the same.
Furthermore, the number of winding turns of the live wire winding, the zero line winding and the ground wire winding is five.
Furthermore, the magnetic core is arranged on the supporting seat, a plurality of wire holes are further formed in the supporting seat, and the two ends of the live wire winding, the zero wire winding and the ground wire winding are connected with the wire holes.
In a second aspect, the present invention further provides a filter circuit, which includes any one of the above common mode inductors, wherein a live wire winding of the common mode inductor is used for connecting with a live wire of a power supply, a zero line winding of the common mode inductor is used for connecting with a zero line of the power supply, and a ground wire winding of the common mode inductor is used for connecting with a ground wire of the power supply.
Further, the capacitor further comprises a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor and a sixth capacitor; the two ends of the first capacitor and the fourth capacitor are respectively connected with the live wire and the null wire of the power supply, the two ends of the second capacitor and the fifth capacitor are respectively connected with the live wire and the ground wire of the power supply, and the two ends of the third capacitor and the sixth capacitor are respectively connected with the null wire of the power supply and the ground wire of the power supply.
According to the common mode inductor and the filter circuit disclosed by the invention, the live wire winding and the zero line winding are wound on the magnetic core in the first direction, and the ground wire winding is wound in the second direction opposite to the first direction, so that a common mode interference signal can also pass through the common mode inductor when flowing through the ground wire, the common mode interference signal including the ground wire common mode noise is consumed through the common mode inductor, and the capability of filtering the common mode interference is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a common mode inductor according to a first embodiment of the present invention;
fig. 2 is a schematic structural diagram of a common mode inductor according to a second embodiment of the present invention;
FIG. 3 is a circuit diagram of a filter circuit using a conventional inductor;
fig. 4 is a circuit diagram of a filter circuit according to a first embodiment of the present invention;
FIG. 5 is a graph of differential mode insertion loss for a filter circuit using a conventional common mode inductor;
fig. 6 is a diagram of the differential mode insertion loss of the filter circuit provided by the first embodiment of the present invention;
FIG. 7 is a graph of common mode insertion loss for a filter circuit using a conventional common mode inductor;
fig. 8 is a diagram of the common mode insertion loss of the filter circuit according to the first embodiment of the present invention.
Reference numerals: 100. a common mode inductor; 10. a magnetic core; 20. a live wire winding; 21. a first live wire winding; 22. a second live wire winding; 23. a third live wire winding; 30. a zero line winding; 40. a ground wire winding; 50. a supporting seat; 60. a wire guide hole.
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 some, not all, embodiments of the present invention. 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 will be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, operations, elements, components, and/or groups thereof.
It is also to be understood that the terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the specification of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should be further understood that the term "and/or" as used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.
In addition, directional terms used in the present invention, such as "up", "down", "front", "back", "left", "right", "inside", "outside", "side", and the like, refer to the attached drawings and the directions of usage of the product. Accordingly, the directional terms used are used for explanation and understanding of the present invention, and are not used for limiting the present invention. Further, in the drawings, structures that are similar or identical are denoted by the same reference numerals.
Referring to fig. 1 to 8, fig. 1 is a schematic structural diagram of a common mode inductor 100 according to a first embodiment of the present invention; fig. 2 is a schematic structural diagram of a common mode inductor 100 according to a second embodiment of the present invention; FIG. 3 is a circuit diagram of a filter circuit using a conventional inductor; fig. 4 is a circuit diagram of a filter circuit according to a first embodiment of the present invention; fig. 5 is a graph of the differential mode insertion loss of a filter circuit using a conventional common mode inductor 100; fig. 6 is a diagram of the differential mode insertion loss of the filter circuit provided by the first embodiment of the present invention; fig. 7 is a graph of the common mode insertion loss of a filter circuit using a conventional common mode inductor 100; fig. 8 is a diagram of the common mode insertion loss of the filter circuit according to the first embodiment of the present invention.
As shown in fig. 1, the common mode inductor 100 includes a magnetic core 10, a ground winding 40, at least one set of a live winding 20, and at least one set of a neutral winding 30; the live wire winding 20 is wound on the magnetic core 10 in a first direction and is used for being connected with a power live wire L; the zero line winding 30 is wound on the magnetic core 10 in the first direction and is used for being connected with a power supply zero line N; the ground winding 40 is wound around the core 10 in a second direction opposite to the first direction for connection to a power ground PE.
The common-mode inductor 100 includes a magnetic core 10 and at least three windings, the three windings are a live wire winding 20, a null wire winding 30 and a ground wire winding 40, the live wire winding 20 is used for being connected with a live wire L of a power supply, the null wire winding 30 is used for being connected with a ground wire PE of the power supply, and the ground wire winding 40 is used for being connected with the ground wire PE of the power supply. The number of the live and neutral windings 20, 30 may be different depending on the power source, for example, one live winding 20 and one neutral winding 30 may be included if a single-phase power source is connected, or three live windings 20 and one neutral winding 30 may be included if a three-phase power source is connected. The live wire winding 20 and the zero wire winding 30 are wound on the magnetic core 10 in a first direction, the ground wire winding 40 is wound on the magnetic core 10 in a second direction, and the first direction is opposite to the second direction, the positions of the live wire winding 20, the zero wire winding 30 and the ground wire winding 40 wound on the magnetic core 10 can be that the live wire winding 20 is on one side, the zero wire winding 30 is wound on the other side of the magnetic core 10 relative to the live wire winding 20, the ground wire winding 40 is positioned between the live wire winding 20 and the zero wire winding 30, or the live wire winding 20 is on one side, the ground wire winding 40 is wound on the other side of the magnetic core 10 relative to the live wire winding 20, the zero wire winding 30 is positioned between the live wire winding 20 and the ground wire winding 40, and the specific winding mode is not limited herein. The number of windings and the wire diameter of the live winding 20, the neutral winding 30, and the ground winding 40 are the same. When the common mode inductor 100 provided by the present invention is applied to a filter circuit, the ground common mode noise can enter the common mode inductor 100 through the ground winding 40, so that the common mode inductor 100 consumes the ground common mode noise, and the filtering capability of the filter circuit is improved.
As a further embodiment, the live winding 20 is wound on one side of the magnetic core 10, the neutral winding 30 is wound on the other side of the magnetic core 10 opposite to the live winding 20, and the ground winding 40 is wound on the magnetic core 10 and located between the live winding 20 and the neutral winding 30.
As a further embodiment, the live winding 20 is wound on one side of the magnetic core 10, the ground winding 40 is wound on the other side of the magnetic core 10 opposite to the live winding 20, and the neutral winding 30 is wound on the magnetic core 10 and located between the live winding 20 and the ground winding 40.
As shown in fig. 1, the live wire winding 20 is wound on the left side, the neutral wire winding 30 is wound on the right side, and the ground wire winding 40 is wound between the live wire winding 20 and the ground wire winding 40, but of course, the neutral wire winding 30 may be wound on the left side, and the live wire winding 20 may be wound on the right side. The direction indicated by the arrow in fig. 1 is the magnetic field direction. Alternatively, the hot winding 20 may be wound on the left side of the core 10, the ground winding 40 may be wound on the right side of the core 10, and the neutral winding 30 may be wound between the hot and ground. It should be noted that the positions of the live winding 20, the neutral winding 30 and the ground winding 40 on the magnetic core 10 may be set according to the winding of the ground wire on the PCB, for example, the live winding 20 is set on the left side, the neutral winding 30 is set on the right side, and the ground winding 40 is set between the live winding 20 and the neutral winding 30.
As a further embodiment, three said live windings 20 and one said neutral winding 30 are included.
The magnetic core 10 of the common mode inductor 100 may be wound with five windings, namely three live windings 20, one neutral winding 30 and one ground winding 40, for adapting to a three-phase power supply.
As a further embodiment, the three live windings 20 are a first live winding 21, a second live winding 22 and a third live winding 23; the first live wire winding 21 and the second live wire winding 22 are wound on one side of the magnetic core 10, the zero line winding 30 and the third live wire winding 23 are wound on the other side of the magnetic core 10 relative to the first live wire winding 21 and the second live wire winding 22, and the ground wire winding 40 is wound on the magnetic core 10 and is located between the second live wire winding 22 and the zero line winding 30.
As shown in fig. 2, the first live wire winding 21 and the second live wire winding 22 are wound on the left side of the magnetic core 10, the neutral wire winding 30 and the third live wire winding 23 are wound on the right side of the magnetic core 10 relative to the first live wire winding 21 and the second live wire winding 22, and the ground wire winding 40 is wound on the magnetic core 10 and located between the second live wire winding 22 and the neutral wire winding 30.
As a further embodiment, the diameters and the numbers of windings of the live winding 20, the neutral winding 30 and the ground winding 40 are the same.
As a further embodiment, the number of winding turns of the live winding 20, the neutral winding 30 and the ground winding 40 is five.
The number of winding turns and the wire diameter of the live wire winding 20, the ground wire winding 40 and the zero wire winding 30 are the same, the number of winding turns is more, the inductance value of the common mode inductor 100 is larger, and the common mode inductor is used for adjusting the resonant frequency of the filter circuit, and preferably, the number of winding turns of the live wire winding 20, the ground wire winding 40 and the zero wire winding 30 is five.
As a further embodiment, the magnetic core assembly further includes a supporting seat 50, the magnetic core 10 is disposed on the supporting seat 50, a plurality of wire holes 60 are further disposed on the supporting seat 50, and two ends of the live wire winding 20, the neutral wire winding 30, and the ground wire winding 40 are all connected to the wire holes 60.
The common mode inductor 100 is fixed on the support base 50, and an even number of wire holes 60 are provided on the support base 50 for connecting with two ends of the winding. As shown in fig. 1, both ends of the live winding 20, the neutral winding 30, and the ground winding 40 are connected to the wire guide 60.
As shown in fig. 4, the present invention further discloses a filter circuit, which includes any one of the common mode inductors 100, wherein the live wire winding 20 of the common mode inductor 100 is used for connecting with the live wire L of the power supply, the zero line winding 30 of the common mode inductor 100 is used for connecting with the power zero line N, and the ground wire winding 40 of the common mode inductor 100 is used for connecting with the ground wire PE of the power supply.
As shown in fig. 4, CM is the common mode inductor 100, the power ground PE is connected to the casing (ground) after passing through the filter circuit, the common mode interference signal passes through the common mode inductor 100 when passing through the ground, and the common mode inductor 100 can consume the ground common mode noise, thereby improving the filtering capability of the filter circuit. The four-port network analyzer is adopted to test the insertion loss of 9 kHz-300 MHz of the filter circuit shown in the figure 3 and the figure 4 respectively, wherein the figure 3 is the filter circuit adopting the existing inductor, the figure 4 is the filter circuit adopting the common mode inductor 100 provided by the invention, the capacitor specifications in the figure 3 and the figure 4 are the same, and the test results are shown in the figures 5-8, the comparison of the figure 5 and the figure 6 shows that the differential mode insertion loss of the two filter circuits has no obvious change between 9 kHz-400 kHz, and the differential mode insertion loss of the filter circuit adopting the common mode inductor 100 provided by the invention is obviously superior to that of the filter circuit adopting the existing common mode inductor 100 between 400 kHz-10 MHz. Comparing fig. 7 and fig. 8, it can be seen that the difference of the common mode insertion loss of the two filter circuits is not obvious between 5MHz and 33 MHz; between 33MHz and 300MHz, the common mode insertion loss of the filter circuit using the common mode inductor 100 of the invention is obviously better than that of the filter circuit using the prior common mode inductor 100.
As a further embodiment, the capacitor further includes a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, and a sixth capacitor C6; the two ends of the first capacitor C1 and the fourth capacitor C4 are respectively connected with the power live wire L and the power zero wire N, the two ends of the second capacitor C2 and the fifth capacitor C5 are respectively connected with the power live wire L and the power ground wire PE, and the two ends of the third capacitor C3 and the sixth capacitor C6 are respectively connected with the power zero wire N and the power ground wire PE.
The first capacitor C1 and the fourth capacitor C4 are differential mode capacitors, and the second capacitor C2, the third capacitor C3, the fifth capacitor C5 and the sixth capacitor C6 are common mode capacitors.
According to the common-mode inductor and the filter circuit disclosed by the invention, the live wire winding, the ground wire winding and the zero line winding are arranged on the magnetic core, so that common-mode interference including ground wire common-mode noise can be filtered, and the filtering capability of the filter circuit is improved.
While the invention has been described with reference to specific embodiments, the invention is not limited thereto, and various equivalent modifications and substitutions can be easily made by those skilled in the art within the technical scope of the invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (10)

1. A common mode inductor, comprising:
a magnetic core;
the at least one group of live wire windings are wound on the magnetic core in a first direction and are used for being connected with a power live wire;
the zero line winding is wound on the magnetic core in the first direction and is used for being connected with a power supply zero line; and
and the ground wire winding is wound on the magnetic core in a second direction opposite to the first direction and is used for being connected with a power supply ground wire.
2. A common-mode inductor according to claim 1, wherein the live winding is wound on one side of the magnetic core, the neutral winding is wound on the other side of the magnetic core opposite to the live winding, and the ground winding is wound on the magnetic core and located between the live winding and the neutral winding.
3. A common-mode inductor according to claim 1, wherein the live winding is wound on one side of the magnetic core, the ground winding is wound on the other side of the magnetic core opposite to the live winding, and the neutral winding is wound on the magnetic core and located between the live winding and the ground winding.
4. A common-mode inductor according to claim 1, characterized by comprising three said live windings and one said neutral winding.
5. The common mode inductor according to claim 4, wherein the three live windings are a first live winding, a second live winding and a third live winding;
the first live wire winding and the second live wire winding are wound on one side of the magnetic core, the third live wire winding and the zero line winding are wound on the other side of the magnetic core relative to the first live wire winding and the second live wire winding, and the ground wire winding is wound on the magnetic core and is located between the second live wire winding and the zero line winding.
6. A common-mode inductor according to claim 2 or 4, characterized in that the wire diameter and the number of windings of the live winding, the neutral winding and the ground winding are all the same.
7. A common-mode inductor according to claim 6, characterized in that the number of winding turns of the live winding, the neutral winding and the ground winding is five.
8. A common-mode inductor according to claim 1, further comprising a supporting base, wherein said magnetic core is disposed on said supporting base, and a plurality of wire holes are disposed on said supporting base, and both ends of said live winding, said neutral winding and said ground winding are connected to said wire holes.
9. A filter circuit comprising a common mode inductor according to any of claims 1 to 8, wherein the line winding of the common mode inductor is adapted to be connected to the line of power, the neutral winding of the common mode inductor is adapted to be connected to the neutral of power, and the ground winding of the common mode inductor is adapted to be connected to the ground of power.
10. The filter circuit of claim 9, further comprising a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, and a sixth capacitor;
the two ends of the first capacitor and the fourth capacitor are respectively connected with the live wire and the null wire of the power supply, the two ends of the second capacitor and the fifth capacitor are respectively connected with the live wire and the ground wire of the power supply, and the two ends of the third capacitor and the sixth capacitor are respectively connected with the null wire of the power supply and the ground wire of the power supply.
CN202210946279.7A 2022-08-08 2022-08-08 Common mode inductor and filter circuit Pending CN115274266A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210946279.7A CN115274266A (en) 2022-08-08 2022-08-08 Common mode inductor and filter circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210946279.7A CN115274266A (en) 2022-08-08 2022-08-08 Common mode inductor and filter circuit

Publications (1)

Publication Number Publication Date
CN115274266A true CN115274266A (en) 2022-11-01

Family

ID=83748075

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202210946279.7A Pending CN115274266A (en) 2022-08-08 2022-08-08 Common mode inductor and filter circuit

Country Status (1)

Country Link
CN (1) CN115274266A (en)

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