Common mode inductor components, filter circuits and household air conditioners

Abstract

The invention discloses a common-mode inductor component, a filter circuit and a household air conditioner. The common-mode inductor component 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 greater than the diameter of the second magnetic ring. The first power line and the second power line are wound around the first magnetic ring to form a common-mode inductor. The ground line comprises a first section and a second section. The first section of the ground line is wound around the first magnetic ring. The magnetic flux generated by the first section of the ground line during operation is superimposed in phase with the magnetic flux generated by the first power line during operation. The second section of the ground line is wound around the second magnetic ring. The common-mode inductor component can suppress interference signals in low-frequency bands and high-frequency bands at the same time.

Description

Technical Field

[0001] The present invention relates to the field of electromagnetic compatibility technology, and in particular to a common mode inductor component, a filter circuit and a household air conditioner. Background Art

[0002] In electronic and electrical equipment, in order to meet the requirements of electromagnetic compatibility (EMC), a magnetic ring is usually set on the power line, and the power line is wound around the magnetic ring to filter out common-mode interference signals. However, the existing power line filter is limited by the inner diameter of the magnetic core. When the volume and inner diameter are constant, it is impossible to increase its common-mode impedance by increasing the number of turns or increasing the size of the magnetic ring. In addition, the filtering frequency band of the traditional power line with a magnetic ring is also narrow. Summary of the invention

[0003] Based on the above problems, an embodiment of the present invention provides a common-mode inductor component, aiming to solve the problems of insufficient common-mode impedance and narrow filtering frequency band of existing common-mode inductor components.

[0004] An embodiment of the present invention provides a common mode inductor component, including:

[0005] A first magnetic ring and a second magnetic ring, wherein the diameter of the first magnetic ring is greater than the diameter of the second magnetic ring;

[0006] A first power line and a second power line are wound around the first magnetic ring, and the first power line and the second power line form a common mode inductor;

[0007] The ground wire comprises a first section and a second section, wherein the first section of the ground wire is wound around the first magnetic ring, the magnetic flux generated by the first section of the ground wire during operation is superimposed in phase with the magnetic flux generated by the first power line during operation, and the second section of the ground wire is wound around the second magnetic ring.

[0008] In the common-mode inductor assembly provided in an embodiment of the present invention, the first section of the ground wire is wound on the first magnetic ring with the first power line and the second power line, and the magnetic flux generated by the first section of the ground wire during operation is superimposed in phase with the magnetic flux generated by the first power line during operation, thereby effectively increasing the common-mode impedance of the common-mode inductor. That is to say, the first section of the ground wire arranged on the first magnetic ring can significantly increase the common-mode impedance of the common-mode inductor assembly, thereby effectively suppressing the common-mode interference current in the electronic and electrical equipment. 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 greater than the diameter of the second magnetic ring. The winding method of the second section of the ground wire can effectively suppress the high-frequency interference signal of the ground wire radiation loop. It can be seen that in the common-mode inductor assembly, the way in which the first section of the ground wire is wound on the first magnetic ring can increase the common-mode impedance to suppress the common-mode interference signal in the low frequency band (150KHz-5MHz); the way in which the second section of the ground wire is wound on the second magnetic ring can filter out the common-mode interference signal in the high frequency band (30MHz-50MHz). That is, the common-mode inductor component can filter out interference signals in both high-frequency bands and low-frequency bands, thereby effectively improving the EMC performance of electronic and electrical equipment.

[0009] In one embodiment, the first magnetic ring includes a first part and a second part;

[0010] The first power line and the second power line are wound around the first part of the first magnetic ring, and the first power line and the second power line are wound in the same direction;

[0011] The first section of the ground wire is wound around the second portion of the first magnetic ring, and the winding direction of the first section of the ground wire is opposite to the winding direction of the first power line.

[0012] The first section of the ground wire and the first power line and the second power line are wound on the first magnetic ring, and the winding direction of the first section of the ground wire is opposite to that of the first power line and the second power line. During operation, the first section of the ground wire and the power line are in the same magnetic core and are anti-phase coupled, and the common mode current in the first section of the ground wire and the power line is just opposite in direction. Therefore, the setting method of the ground wire can significantly increase the common mode impedance of the common mode inductor component, thereby effectively suppressing the common mode interference current in the electronic and electrical equipment.

[0013] In one embodiment, the second magnetic ring is attached to the second portion of the first magnetic ring. By attaching the second magnetic ring to the second portion of the first magnetic ring, the first magnetic ring and the second magnetic ring are formed into a whole. The operation of forming the first magnetic ring and the second magnetic ring into a whole also facilitates the subsequent operation of sheathing the first magnetic ring, the second magnetic ring, the first power line, the second power line, and the ground line in the same heat shrink tubing.

[0014] In one 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 around the second portion 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 line. By winding the third section of the ground wire around the first magnetic ring and making its winding direction opposite to the winding direction of the first power line, the third section of the ground wire can also significantly increase the common-mode impedance of the common-mode inductor component, thereby effectively suppressing the common-mode interference current in the electronic and electrical equipment. 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-mentioned setting method can make the first magnetic ring and the second magnetic ring temporarily form a whole, so as to facilitate the subsequent assembly process.

[0015] In one embodiment, the manufacturing material of the first magnetic ring includes one or more of amorphous material, manganese-zinc material or nickel-zinc material;

[0016] And / or, the material of the second magnetic ring includes nickel-zinc material.

[0017] The material type of the first magnetic ring is not limited, and it can be an amorphous material, a manganese-zinc material, or a nickel-zinc material. Different materials are generally selected according to the frequency band and radiation characteristics of the interference. The second magnetic ring is made of nickel-zinc material. Since nickel-zinc material has the characteristics of high frequency, wide frequency, high impedance, and low loss, the second magnetic ring is made of nickel-zinc material, which can effectively filter out the interference of common-mode signals in the high-frequency band.

[0018] In one 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 neutral line. In the technical solution of this embodiment, the first power line (phase line) and the second power line (neutral line) are wound in the same direction on the first magnetic ring, and the number of turns and the phase are the same. When the normal operating current (differential mode current) in the circuit flows through the common-mode inductor component, the working current generates a reverse magnetic field in the inductor coil wound in the same phase and cancels each other out. Therefore, the differential mode impedance of the common-mode inductor component is very low and has little effect on the normal operating current. When the interference current (common mode current) in the circuit flows through the common-mode inductor component, due to the isotropy of the common-mode current, a magnetic field in the same direction will be generated in the common-mode inductor component, increasing the inductive reactance of the coil, so that the common-mode inductor component exhibits a higher common-mode impedance.

[0019] In one embodiment, the number of turns of the first section of the ground wire on the first magnetic ring is less than the number of turns of the first power line on the first magnetic ring;

[0020] And / or, the number of turns of the second section of the ground wire around the second magnetic ring is greater than the number of turns of the first section of the ground wire around the first magnetic ring.

[0021] By setting the number of turns of the first section of the ground wire on the first magnetic ring to be smaller than the number of turns of the first power line on the first magnetic ring, the common mode impedance of the common mode inductor assembly can be increased without causing too much impact on the working performance of the common mode inductor composed of the first power line and the second power line. In addition, since the first section and the second section of the ground wire are respectively arranged on the first magnetic ring and the second magnetic ring, setting the number of turns of the second section of the ground wire on the second magnetic ring to be larger than the number of turns of the first section of the ground wire on the first magnetic ring helps to improve the performance of the ground wire in filtering high-frequency interference signals.

[0022] In one embodiment, the common-mode inductor assembly further includes a heat shrink sleeve, which is sleeved on the outside of the first magnetic ring, the second magnetic ring, the first power line, the second power line, and the ground line. By sleeved on the outside of the first magnetic ring, the second magnetic ring, the first power line, the second power line, and the ground line, the heat shrink sleeve can make the common-mode inductor assembly form a whole, so as to facilitate subsequent installation and use.

[0023] Another embodiment of the present invention further provides a filter circuit, comprising a common-mode inductor component as described in any one of the above embodiments. By arranging the common-mode inductor component on the filter circuit, the filter circuit can effectively filter out the common-mode interference signal current during the operation of the electronic and electrical equipment because the common-mode inductor component has a higher common-mode impedance and a common-mode signal filtering function that takes into account both the low-frequency band and the high-frequency band.

[0024] Another embodiment of the present invention provides a household air conditioner, comprising a common-mode inductor assembly as described in any one of the above embodiments. By arranging the common-mode inductor assembly on the household air conditioner, since the common-mode inductor assembly has a higher common-mode impedance and a common-mode signal filtering function that takes into account both low-frequency band and high-frequency band, the filtering circuit can effectively filter out the common-mode interference signal current during the operation of the electronic and electrical equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0026] Figure 1 A schematic structural diagram of a common-mode inductor component provided in an embodiment of the present invention.

[0027] Figure 2 for Figure 1 A structural diagram of the common-mode inductor component from another perspective.

[0028] Figure 3 for Figure 1 A structural schematic diagram of the common-mode inductor component from another perspective.

[0029] Figure 4 A schematic structural diagram of a common-mode inductor component provided in another embodiment of the present invention.

[0030] Figure 5 To have Figure 1 Schematic diagram of the current loop of the application circuit of the common-mode inductor component when generating differential-mode current or common-mode current.

[0031] Figure 6 To have Figure 1 Schematic diagram of the structure of the filter circuit of the common-mode inductor component.

[0032] Figure 7 This is the disturbance voltage data obtained from the traditional common mode inductor component during the EMI test process.

[0033] Figure 8 This is the interference power data obtained during the EMI test of traditional common-mode inductor components.

[0034] Fig. 9 The disturbance voltage data is obtained during the EMI test of the common mode inductor component provided in the embodiment of the present invention.

[0035] Fig.10 The disturbance power data obtained during the EMI test of the common-mode inductor component provided in the embodiment of the present invention.

[0036] Description of Figure Numbers:

[0037] Label name Label name Common mode inductor components 100 The first magnetic ring 110 Second magnetic ring 120 First power line 130 Second power cord 140 Ground 150 Paragraph 1 151 Paragraph 2 152 Paragraph 3 153 Part I 111 Part 2 112 Heat shrink tubing 160 First End 131 Second end 132 The third end 141 The fourth end 142 One end 154 The other end 155 First capacitor C1 Second capacitor C2 The third capacitor C3 The fourth capacitor C4 DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0040] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0041] See also Figure 1 and Figure 2 An embodiment of the present invention provides a common-mode inductor component 100 , which includes a first magnetic ring 110 , a second magnetic ring 120 , a first power line 130 , a second power line 140 and a ground line 150 .

[0042] The diameter of the first magnetic ring 110 is greater than the diameter of the second magnetic ring 120. In this embodiment, the outer diameter of the first magnetic ring 110 is 25 mm, the inner diameter is 18 mm, and the thickness is 12 mm. The outer diameter of the second magnetic ring 120 is 16 mm, the inner diameter is 10 mm, and the thickness is 10 mm. It can be understood that the first magnetic ring 110 and the second magnetic ring 120 can also be other sizes, which can be set according to the specific needs of the product.

[0043] 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 form a common mode inductor.

[0044] The ground wire 150 includes a first section 151 and a second section 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 section 151 of the ground wire 150 during operation is superimposed in phase with the magnetic flux generated by the first power line 130 during operation. The second section 152 of the ground wire 150 is wound around the second magnetic ring 120.

[0045] In the common-mode inductor component 100 provided in the above embodiment, the first section 151 of the ground wire 150 is wound on the first magnetic ring 110 with the first power line 130 and the second power line 140, and the magnetic flux generated by the first section 151 of the ground wire 150 during operation is superimposed in phase with the magnetic flux generated by the first power line 130 during operation, thereby effectively increasing the common-mode impedance of the common-mode inductor component 100. In other words, the first section 151 of the ground wire 150 arranged on the first magnetic ring 110 can significantly increase the common-mode impedance of the common-mode inductor component 100, thereby effectively suppressing the common-mode interference current in the electronic and electrical equipment. In addition, the second section 152 of the ground wire 150 is wound on the second magnetic ring 120, and the diameter of the first magnetic ring 110 is greater than the diameter of the second magnetic ring 120. The winding method 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 inductor component 100, the first section 151 of the ground wire 150 is wound around the first magnetic ring 110 to increase the common-mode impedance to suppress the common-mode interference signal in the low frequency band (150KHz-5MHz). The second section 152 of the ground wire 150 is wound around the second magnetic ring 120 to filter out the common-mode interference signal in the high frequency band (30MHz-50MHz). That is, the common-mode inductor component 100 can take into account the filtering of interference signals in both the high frequency band and the low frequency band, thereby effectively improving the EMC performance of electronic and electrical equipment.

[0046] Please also see Figure 3Specifically, 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 section 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 on the first magnetic ring 110, and the number of turns is equal. When there is a common mode current entering and exiting the first power line 130 and the second power line 140 at the same time, 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 line 150 on the first magnetic ring 110 is opposite to the winding direction of the first power line 130 on the first magnetic ring 110, if there is an interference voltage at the power input end, the common mode current with the ground line 150 as the return path forms a closed loop between the first power line 130 and the ground line 150, and forms a closed loop between the second power line 140 and the ground line 150. Because the common mode current in the ground wire 150 is opposite to the common mode current in the first power wire 130 or the second power wire 140, the magnetic flux Φ3 generated by the first section 151 of the ground wire 150 during operation is also in phase with the magnetic flux Φ1 generated by the first power wire 130 or the magnetic flux Φ2 generated by the second power wire 140. At this time, the magnetic flux Φ1 generated by the first power wire 130, the magnetic flux Φ2 generated by the second power wire 140, and the magnetic flux Φ3 generated by the first section 151 of the ground wire 150 are superimposed in phase, thereby increasing the common mode inductance of each coil, thereby increasing the common mode impedance of the common mode inductor formed by the first power wire 130 and the second power wire 140. In addition, since the first power wire 130 and the second power wire 140 are approximately balanced with respect to the ground wire 150, and the common mode current in the ground wire 150 is often very small, the influence of the ground wire 150 on the differential mode signal current in the first power wire 130 and the second power wire 140 can be ignored.

[0047] Specifically, the first magnetic ring 110 and the second magnetic ring 120 are both arranged in a circular ring shape to form a closed magnetic circuit. The arrangement of the first magnetic ring 110 and the second magnetic ring 120 can reduce the occurrence of magnetic leakage. In this embodiment, the first magnetic ring 110 includes a first part 111 and a second part 112. Specifically, the first part 111 and the second part 112 of the first magnetic ring 110 are both in the shape of a semicircular ring, which together constitute the entirety of the first magnetic ring 110. As required, the first part 111 and the second part 112 can be arranged in the upper and lower parts of the first magnetic ring 110, or in the left and right parts of the first magnetic ring 110. Those skilled in the art can arrange them according to the specific needs of the product. As required, an insulating component (not shown) can be provided on the outer surface of the first magnetic ring 110 to insulate the first magnetic ring 110 from the first power line 130, the second power line 140 and the ground line 150. Specifically, the insulating component can be one or more of an insulating heat shrink sleeve, an insulating plastic film or an insulating paint. By providing an insulating component 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 avoid the first power line 130 and the second power line 140 from being electrically connected to the first magnetic ring 110, thereby causing the function of the common mode inductor component 100 to fail. As required, the material of the first magnetic ring 110 includes one or more of an amorphous material, a manganese-zinc material or a nickel-zinc material. As required, the material of the second magnetic ring 120 includes a nickel-zinc material. Specifically, the first magnetic ring 110 can be made of an amorphous magnetic material, a ferrite material such as manganese-zinc ferrite, nickel-zinc ferrite, etc., or a magnetic material such as iron powder. Generally, the type of material for making the first magnetic ring 110 is not limited, and it can be an amorphous material, a manganese-zinc material or a nickel-zinc material. Generally, different materials are selected according to the frequency band and radiation characteristics of the interference. The material for making the second magnetic ring 120 is nickel-zinc material. Because nickel-zinc material has the characteristics of high frequency, wide frequency, high impedance and low loss. The second magnetic ring 120 is made of nickel-zinc material, which can effectively filter out the interference of common-mode signals in the high-frequency band. Generally speaking, the first magnetic ring 110 should be made of a material with suitable magnetic permeability to avoid the first magnetic ring 110 entering a saturated state during actual operation and affecting the performance of the common-mode inductor component 100 in filtering out common-mode interference signals. As needed, the shape of the first magnetic ring 110 can also be an elliptical shape, a runway shape, or a polygonal ring, which can be determined according to the actual needs of the product and is not specifically limited here.

[0048] Specifically, the first power line 130 is wound around the first part 111 of the first magnetic ring 110. The second power line 140 is wound around the first part 111 of the first magnetic ring 110. The winding direction of the second power line 140 is the same as the winding direction of the first power line 130. Specifically, in the present embodiment, the winding direction of the first power line 130 and the second power line 140 is: along the direction from the left side to the right side, from the outside of the first magnetic ring 110 (facing the observer) to the inside of the first magnetic ring 110 (backwards from the observer) in a clockwise direction. Since the winding direction and winding position of the first power line 130 and the second power line 140 are the same, in the actual manufacturing process, the first power line 130 and the second power line 140 can be wound around the first part 111 of the first magnetic ring 110 at the same time to simplify the manufacturing process. It is understandable that the outer surfaces of the first power line 130 and the second power line 140 can be provided with an insulating sleeve, an insulating film or an insulating paint so that the first power line 130 and the second power line 140 will not be mutually conductive when they are wound around the first part 111 of the first magnetic ring 110. At the same time, the insulating sleeve, the insulating film or the insulating paint can also prevent the first power line 130 and the second power line 140 from forming an electrical connection with the first magnetic ring 110. As required, the first power line 130 and the second power line 140 must also be insulated from each other to ensure that there will be no breakdown short circuit between the first power line 130 and the second power line under the action of transient overvoltage. As required, the first power line 130 and the second power line 140 are also wound in a single-layer coil as much as possible to reduce the parasitic capacitance between the coils.

[0049] The first section 151 of the ground wire 150 is wound around the second portion 112 of the first magnetic ring 110. The winding direction of the first section 151 of the ground wire 150 is opposite to the winding direction of the first power line 130. Specifically, in the present embodiment, the winding direction of the first section 151 of the ground wire 150 is: in the top area of ​​the first magnetic ring 110, from the outside of the first magnetic ring 110 (facing the observer) to the inside of the first magnetic ring 110 (facing away from the observer) in a counterclockwise direction. As required, the winding direction of the first power line 130 and the second power line 140 can also be: along the left to right direction, from the inner side of the first magnetic ring 110 (backward from the observer) to the outer side of the first magnetic ring 110 (facing the observer) in a clockwise direction; the winding direction of the ground wire 150 is: in the bottom area of ​​the first magnetic ring 110, along the left to right direction, from the inner side of the first magnetic ring 110 (backward from the observer) to the outer side of the first magnetic ring 110 (facing the observer) in a counterclockwise direction. As long as the winding direction of the first section 151 of the ground wire 150 can be opposite to the winding direction of the first power line 130. Specifically, the ground wire 150 refers to the wire that connects the power input terminal of the electronic and electrical equipment to the earth due to safety requirements. As required, the outer surface of the ground wire 150 can also be provided with an insulating sleeve, an insulating film or an insulating paint to prevent the ground wire 150 from forming an electrical connection with the first magnetic ring 110. As required, the ground wire 150 is also wound with a single-layer coil as much as possible to reduce the parasitic capacitance between the coils.

[0050] That is, by winding the first section 151 of the ground wire 150 and the first power line 130 and the second power line 140 on the first magnetic ring 110, and making the winding direction of the first section 151 of the ground wire 150 opposite to the winding direction of the first power line 130 and the second power line 140. During operation, the first section 151 of the ground wire 150 and the first power line 130 and the second power line 140 are located in the first magnetic ring 110 and are anti-coupled, and the common mode current in the first section 151 of the ground wire 150 and the first power line 130 and the second power line 140 is just opposite in direction, so the arrangement of the first section 151 of the ground wire 150 can significantly increase the common mode impedance of the common mode inductor component 100, thereby effectively suppressing the common mode interference current in the electronic and electrical equipment.

[0051] 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 whole, which is convenient for subsequent assembly or operation. For example, when the common-mode inductor assembly 100 needs to be sleeved inside the heat shrink sleeve, the structure in which the first magnetic ring 110 and the second magnetic ring 120 are attached together facilitates sleeve-mounting of 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 together.

[0052] In one embodiment, the ground line 150 further includes a third section 153, such as Figure 4 As shown. 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 winding direction of the third section 153 of the ground wire 150 is opposite to the winding direction of the first power line 130. By winding the third section 153 of the ground wire 150 on the first magnetic ring 110, and making its winding direction opposite to the winding direction of the first power line 130. The third section 153 of the ground wire 150 can also significantly increase the common mode impedance of the common mode inductor component 100, thereby effectively suppressing the common mode interference current in the electronic and electrical equipment. 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-mentioned setting method can make the first magnetic ring 110 and the second magnetic ring 120 temporarily form 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 both 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.

[0053] In one embodiment, the first power line 130 and the second power line 140 form a single-phase power supply mode. The first power line 130 is a phase line, connected to the phase line voltage. The second power line 140 is a neutral line, connected to the neutral 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 in the same direction on the same first magnetic ring 110, with the same number of turns and phase. When the normal working current (differential mode current) in the circuit flows through the common mode inductor component 100, the working current generates a reverse magnetic field in the inductor coil wound in the same phase and cancels each other out. That is, the differential mode impedance of the common mode inductor component 100 is very low and has little effect on the normal working current. When the interference current (common mode current) in the circuit flows through the common mode inductor component 100, due to the isotropy of the common mode current, a magnetic field in the same direction will be generated in the common mode inductor component 100 to increase the inductive reactance of the coil, so that the common mode inductor component 100 exhibits a higher common mode impedance characteristic, thereby playing a role in filtering out the common mode interference signal current.

[0054] In one embodiment, the number of turns of the first section 151 of the ground wire 150 on the first magnetic ring 110 is less than the number of turns of the first power line 130 on the first magnetic ring 110. As required, the number of turns of the second section 152 of the ground wire 150 on the second magnetic ring 120 is greater than the number of turns of the first section 151 of the ground wire 150 on the first magnetic ring 110. Specifically, the first power line 130 and the second power line 140 are wound around the first magnetic ring 110 for 4 turns. The first section 151 of the ground wire 150 is wound around the first magnetic ring 110 for 1 turn. The second section 152 of the ground wire 150 is wound around the second magnetic ring 120 for 5 turns. During the specific winding process, the first power line 130 and the second power line 140 can be wound around the first magnetic ring 110 for 4 turns at the same time, and then the second section 152 of the ground wire 150 can be wound around the second magnetic ring 120 for 5 turns, and finally the first section 151 of the ground wire 150 can be wound around the first magnetic ring 110 in the opposite direction for 1 turn, so that the first magnetic ring 110 and the second magnetic ring 120 are combined together.

[0055] By setting the number of turns of the first section 151 of the ground wire 150 on the first magnetic ring 110 to be smaller than the number of turns of the first power line 130 on the first magnetic ring 110, the common mode impedance of the common mode inductor assembly 100 can be increased without causing too much impact on the working performance of the common mode inductor composed of the first power line 130 and the second power line 140. In addition, since the first section 151 and the second section 152 of the ground wire 150 are respectively arranged on the first magnetic ring 110 and the second magnetic ring 120, setting the number of turns of the second section 152 of the ground wire 150 on the second magnetic ring 120 to be greater than the number of turns of the first section 151 of the ground wire 150 on the first magnetic ring 110 helps to improve the performance of the ground wire 150 in filtering out high-frequency interference signals.

[0056] In one embodiment, the common-mode inductor component 100 further includes a heat shrink sleeve 160. The heat shrink sleeve 160 is sleeved on the outside of 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 sleeved the heat shrink sleeve 160 on the outside of 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 shrink sleeve 160 can make the common-mode inductor component 100 form a whole, so as to facilitate subsequent installation and use. Specifically, after the first power line 130, the second power line 140 and the ground line 150 are all wound, the heat shrink sleeve 160 can be sleeved on the outside of 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 shrinkable tube 160 is heated to shrink the heat shrinkable tube 160 , thereby forming the common mode inductor assembly 100 into a whole.

[0057] The working process of the common mode inductor component 100 is as follows:

[0058] During the operation of electronic and electrical equipment, there are common-mode coupling paths between the current round-trip paths in the current loop and between the positive and negative poles of the electronic device and the ground wire, thus generating common-mode interference signals. Common-mode interference signals generally have equal amplitudes and the same phases on each current round-trip path.

[0059] Please also see Figure 5 In order to reduce the influence of the common-mode interference signal on the load, a common-mode inductor component 100 is usually 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 the single-phase power input terminal as an example, it includes a phase line voltage terminal L and a neutral line voltage terminal N. The first end 131 of the first power line 130 is connected to the phase line voltage terminal L, and the third end 141 of the second power line 140 is connected to the neutral line voltage terminal 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.

[0060] For the differential mode current I DMN For example, due to the inductance L in the first power line 130 CM1 The generated magnetic flux and the inductance L in the second power line 140 CM2 The magnetic flux generated is reversed, and the inductance L CM1 The generated magnetic flux Φ1 and inductance L CM2 The generated magnetic fluxes Φ2 cancel each other out, so that the differential mode impedance of the common mode inductor formed by the first power line 130 and the second power line 140 is close to zero.

[0061] For the common mode current I CMN For example, due to the inductance L in the first power line 130 CM1 The generated magnetic flux and the inductance L in the second power line 140 CM2 The magnetic flux generated is in the same direction, and the inductance L CM1 The generated magnetic flux Φ1 and inductance L CM2 The generated magnetic flux Φ2 mutually enhances each other, 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 relatively large. At the same time, due to the inductance L in the ground line 150 G The inductance L in the first power line 130 CM1 The winding direction is opposite, resulting in the inductance L in the ground wire 150 G The generated magnetic flux is related to the inductance L in the first power line 130 CM1 The generated magnetic fluxes are in the same direction, thereby further increasing the common mode impedance of the common mode inductor formed by the first power line 130 and the second power line 140 .

[0062] Specifically, taking the signal current in the first power line 130 as positive as an 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, then the total current I 1 =Is+I DMN The total current I in the second power line 140 2 =-Is+I DMN Among them, Is is the magnitude of the signal current, 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 inductive reactance of the signal current Is in the common mode inductor component 100 is very small, and the differential mode attenuation in the signal loop is very small.

[0063] As for the common-mode interference signal in the first power line 130 and the second power line 140, due to the common-mode current I CMN The magnitudes are equal and the phases are the same, so that a magnetic field superimposed in phase is induced in the first magnetic ring 110, so that the common mode current I CMN It is subjected to a larger AC impedance, thereby filtering out the common-mode interference signal current.

[0064] However, for some specific applications, the common mode AC impedance formed by the first power line 130 and the second power line 140 is not high enough. Therefore, in the common mode inductor assembly 100 provided in the embodiment of the present invention, the first section 151 of the ground line 150 and the first power line 130 and the second power line 140 are wound on the first magnetic ring 110, and the winding direction of the first section 151 of the ground line 150 is opposite to the winding direction of the first power line 130 and the second power line 140. Therefore, during operation, the total current I flowing through the ground line 150 is PE =Ic. That is to say, the magnetic field induced by the common-mode interference signal current Ic in the ground wire 150 in the first magnetic ring 110 and the magnetic field induced by the first power line 130 and the second power line 140 in the first magnetic ring 110 are superimposed on each other, so that the common-mode inductor component 100 has a larger AC impedance relative to the common-mode signal current, thereby playing a role in filtering out the common-mode interference signal current in the electronic and electrical equipment. On the other hand, since the second section 152 of the ground wire 150 is also wound around the second magnetic ring 120. Since the diameter of the second magnetic ring 120 is smaller than the diameter of the first magnetic ring 110, and the second magnetic ring 120 is made of nickel-zinc material, the second section 152 of the ground wire 150 can effectively filter out interference signals in the high-frequency band, so that the common-mode inductor component 100 takes into account the characteristics of filtering out low-frequency common-mode interference signals and filtering out high-frequency common-mode interference signals.

[0065] It can be understood that the first end 131 of the first power line 130 and the third end 141 of the second power line 140 are adjacently arranged and are the same-named ends. The second end 132 of the first power line 130 and the fourth end 142 of the second power line 140 are adjacently arranged and are the same-named ends. Since the first end 131 and the third end 141 are adjacently arranged and are the same-named ends, the second end 132 and the fourth end 142 are adjacently arranged and are the same-named ends. When a common-mode current flows through the common-mode inductor component 100, due to the isotropy of the common-mode current, a magnetic field of the same direction will be generated in the common-mode inductor component 100 to increase the inductive reactance of the coil, which is manifested as a higher common-mode impedance. Specifically, the same-name end and the opposite-name end refer to: under the action of the same changing magnetic flux, the terminals with the same polarity of the induced electromotive force are called the same-name ends, and the terminals with opposite polarities of the induced electromotive force are called the opposite-name ends. In the drawing of the drawing, a group of same-name ends are usually marked with the symbol "·".

[0066] It can be understood 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 line 130 and the third end 141 of the second power line 140 and are opposite ends. The connecting end of the first section 151 and the second section 152 of the ground wire 150 is disposed adjacent to the second end 132 of the first power line 130 and the fourth end 142 of the second power line 140 and are opposite ends. Since the fifth end 154 of the ground wire 150 is disposed adjacent to the first end 131 and are opposite ends, the connecting end of the first section 151 and the second section 152 of the ground wire 150 is disposed adjacent to the second end 132 and are opposite ends. When a common mode current flows through the common mode inductor component 100, the common mode interference current between the power lines 130, 140 and the ground wire 150 is equivalent to a differential mode current relative to the common mode inductor component 100. Since the ground wire 150 is wound in the opposite direction to the power wires 130 and 140 and has a different name from the input end of the adjacent power wire, the common mode inductor component 100 can significantly increase the common mode impedance of the power input end of the electronic and electrical equipment.

[0067] It can be understood that the common-mode inductor component 100 is not limited to the above-mentioned embodiments. In another embodiment, the common-mode inductor component 100 also includes a third power line (not shown). The third power line is wound around the first part 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 this embodiment, the first power line 130, the second power line 140 and the third power line form a multi-phase power supply mode. The first power line 130 and the third power line are phase lines. The second power line 140 is a neutral 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, and making the number of turns the same. The common-mode inductor component 100 can also achieve the purpose of suppressing common-mode current.

[0068] As needed, the common-mode inductor assembly 100 also includes a third power line and a fourth power line, forming four power lines. The four power lines form a three-phase power supply mode. It can be understood that the neutral line can also be set as needed. 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. The four power lines are wound around the first part 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.

[0069] It is understandable that the common mode inductor assembly 100 may further include a base. The base is provided with corresponding terminals to lead out the terminals of the first power line 130, the second power line 140 and the ground line 150. At this time, the first magnetic ring 110 and the second magnetic ring 120 may be arranged on the base by plugging, snapping or gluing.

[0070] As required, the ends of the first power line 130 , the second power line 140 , and the ground line 150 may be provided with wiring rings or wiring terminals to facilitate the electrical connection between the common mode inductor assembly 100 and other electronic components.

[0071] Another embodiment of the present invention further provides a filter circuit, which includes the common mode inductor component 100 as described above. Figure 6 As shown, the first end 131 of the first power line 130 in the common mode inductor component 100 is connected to the phase line voltage terminal L, and the second end 132 of the first power line 130 in the common mode inductor component 100 is connected to one end of the load. The third end 141 of the second power line 140 in the common mode inductor component 100 is connected to the neutral line voltage terminal N, and the fourth end 142 of the second power line 140 in the common mode inductor component 100 is connected to the other end of the load. The fifth end 154 of the ground line 150 in the common mode inductor component 100 is grounded, and the sixth end 155 of the ground line 150 in the common mode inductor component 100 is connected to the ground terminal PE of the electronic and electrical equipment. It can be seen from the previous analysis process that the first section 151 of the ground line 150 is wound on the first magnetic ring 110 with the first power line 130 and the second power line 140, and the winding direction of the first section 151 of the ground line 150 is opposite to the winding direction of the first power line 130 and the second power line 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 field induced by the first power line 130 and the second power line 140 in the first magnetic ring 110 are superimposed on each other, so that the common-mode inductor component 100 has a larger AC impedance relative to the common-mode signal current, thereby playing a role in filtering out the common-mode interference signal current in the electronic and electrical equipment. In other words, since the common-mode inductor component 100 has a higher common-mode impedance, the filter circuit can effectively filter out the common-mode interference signal current during the operation of the electronic and electrical equipment. In addition, since the second section 152 of the ground wire 150 in the common-mode inductor component 100 is wound on the second magnetic ring 120, the filtering effect on the high-frequency interference signal can be achieved. That is, since the common-mode inductor component 100 used has a higher common-mode impedance and takes into account the common-mode signal filtering function of the low-frequency band and the high-frequency band at the same time, the corresponding filter circuit can also effectively filter out the common-mode interference signal during the operation of the electronic and electrical equipment, while taking into account the common-mode signal filtering function of the low-frequency band and the high-frequency band.

[0072] As required, the filter circuit may further include a first capacitor C1 and a second capacitor C2. One end of the first capacitor C1 is connected to the first end 131 of the first power line 130, and the other end of the first capacitor C1 is connected to the third end 141 of the second power line 140. One end of the second capacitor C2 is connected to the second end 132 of the first power line 130, and the other end of the second capacitor C2 is connected to the fourth end 142 of the second power line 140. The first capacitor C1 and the second capacitor C2 are used to filter out the common mode signal interference at the input end and the output end, respectively. As required, the first capacitor C1 and the second capacitor C2 may be film capacitors (safety X capacitors), and the capacity range may be selected from 0.01μF to 3.3μF.

[0073] As required, the filter circuit may further include a third capacitor C3 and a fourth capacitor C4. 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 terminal PE of the electronic and electrical equipment. 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 terminal PE of the electronic and electrical equipment. The third capacitor C3 and the fourth capacitor C4 are mainly used to filter out common mode signal interference. As required, the third capacitor C3 and the fourth capacitor C4 can select safety Y capacitors with a capacity range of 470PF to 0.01μF.

[0074] It is understandable that in the filter circuit, the common mode inductor component 100 may also include a third power line or a fourth power line. At this time, the specific structure of the filter circuit may also be adjusted according to actual needs.

[0075] It is understandable that in the filter circuit, one or more common mode inductor components 100 can be provided according to actual needs, so as to achieve single-stage filtering or multi-stage filtering to meet the requirements of electromagnetic compatibility in different situations.

[0076] Another embodiment of the present invention further provides a household air conditioner, which includes the common-mode inductor assembly 100 as described in any one of the above embodiments. By arranging the common-mode inductor assembly 100 on the household air conditioner, since the common-mode inductor assembly 100 has a higher common-mode impedance and can take into account the filtering common mode of high frequency and low frequency, the common-mode current generated by the household air conditioner during operation can be effectively suppressed by the common-mode inductor assembly 100. As needed, the common-mode inductor assembly 100 can also be used in household appliances such as refrigerators, microwave ovens, and rice cookers, which are not specifically limited here.

[0077] In fact, when the common-mode inductor assembly 100 provided in the embodiment of the present invention is installed on a household air conditioner, the EMI (electro magnetic interference) test result thereof is significantly better than that of a conventional common-mode inductor.

[0078] See also Figure 7 and Figure 8 , is the EMI test result of the traditional common mode inductor component. Figure 7 It can be seen that the use of traditional common-mode inductor components (phase line L and neutral line N are wound 4 times on the amorphous magnetic ring, and the ground line PE is not wound, and the size of the amorphous magnetic ring is: outer diameter 28mm, inner diameter 18mm, height 10mm), the tested interference voltage has a quasi-peak value of 65.00dBμV in the low frequency band (154KHz) and an average value of 61.04dBμV; the quasi-peak value in the high frequency band (22.606MHz) is 47.20dBμV, and the average value is 41.39dBμV. Figure 8 It can be seen that the quasi-peak value of the tested interference power in the frequency range of about 30MHz is 41.92dBpW, and the average value is 36.72dBpW; the quasi-peak value at 66MHz is 39.68dBpW, and the average value is 29.04dBpW.

[0079] See also Fig. 9 and Fig.10 , which is the EMI test result of the common mode inductor component provided by the embodiment of the present invention. Fig. 9 It can be seen that the common-mode inductor assembly provided by the embodiment of the present invention (the phase line L and the neutral line N are wound 3 times on the amorphous magnetic ring, the ground line PE is reversely wound 2 times on the amorphous magnetic ring, and then the nickel-zinc magnetic ring is connected in series to wind 4 times, wherein the dimensions of the amorphous magnetic ring are: outer diameter 28mm, inner diameter 18mm, height 10mm; wherein the dimensions of the nickel-zinc magnetic ring are: outer diameter 16mm, inner diameter 10mm, height 8mm;), the tested interference voltage has a quasi-peak value of 55.38dBμV in the low frequency band (158KHz), and an average value of 50.32dBμV; the quasi-peak value in the high frequency band (25.262MHz) is 41.59dBμV. From Fig.10 It can be seen that the quasi-peak value of the disturbance power in the frequency range of about 32 MHz is 38.24 dBpW, and the average value is 29.32 dBpW. It can be seen that the EMI test data of the common mode inductor component provided by the embodiment of the present invention is significantly better than that of the traditional common mode inductor component.

[0080] It should be noted that the above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be equivalent replacement methods and are included in the protection scope of the present invention.

Claims

1. A common mode inductor component, characterized in that: include: A first magnetic ring and a second magnetic ring, wherein the diameter of the first magnetic ring is greater than the diameter of the second magnetic ring; A first power line and a second power line are wound around the first magnetic ring, and the first power line and the second power line form a common mode inductor; A ground wire, comprising a first section and a second section, wherein the first section of the ground wire is wound around the first magnetic ring, a magnetic flux generated by the first section of the ground wire during operation is superimposed in phase with a magnetic flux generated by the first power line during operation, and the second section of the ground wire is wound around the second magnetic ring; The first magnetic ring includes a first part and a second part; the first power line and the second power line are wound around the first part of the first magnetic ring, and the first power line and the second power line are wound in the same direction; the first section of the ground line is wound around the second part of the first magnetic ring, and the winding direction of the first section of the ground line is opposite to that of the first power line; The first part and the second part are respectively arranged at the upper and lower parts of the first magnetic ring, or the first part and the second part are respectively arranged at the left and right parts of the first magnetic ring; The ground wire also 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 around 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 line.

2. The common mode inductor component according to claim 1, characterized in that: The second magnetic ring is attached to the second part of the first magnetic ring.

3. The common mode inductor component according to claim 1 or 2, characterized in that: 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 material of the second magnetic ring includes nickel-zinc material.

4. The common mode inductor component according to claim 1 or 2, characterized in that: 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 neutral line.

5. The common mode inductor component according to claim 1 or 2, characterized in that: The number of turns of the first section of the ground wire on the first magnetic ring is less than the number of turns of the first power line on the first magnetic ring; And / or, the number of turns of the second section of the ground wire on the second magnetic ring is greater than the number of turns of the first section of the ground wire on the first magnetic ring.

6. The common mode inductor component according to claim 1 or 2, characterized in that: The common mode inductor assembly further includes a heat shrink tubing, which is sleeved outside the first magnetic ring, the second magnetic ring, the first power line, the second power line and the ground line.

7. A filter circuit, characterized in that: Comprising the common-mode inductor component as described in any one of claims 1-6.

8. A household air conditioner, characterized in that: Comprising the common-mode inductor component as described in any one of claims 1-6.

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