Inductor unit and preparation method, balanced inductor and preparation method, high-frequency inverter

Abstract

The present invention relates to a balanced inductor and a method for preparing the same. To address the technical issues in the prior art of complex winding methods for output balanced inductors, prone to errors, resulting in difficulty in commercialization and promotion, and difficulty in meeting design requirements, an inductor unit and a method for preparing the same, a balanced inductor and a method for preparing the same, and a high-frequency inverter are provided. The inductor unit includes two insulating wires and two magnetic rings, each of which is divided into four quadrants by a plane rectangular coordinate system with the center of the magnetic ring as the origin. Of the two magnetic rings, the portion of one magnetic ring located in the first and fourth quadrants and the portion of the other magnetic ring located in the second and third quadrants are wound around an insulating wire. The balanced inductor includes a fixing and at least one inductor unit, and the magnetic rings of each inductor unit are connected as a whole via a fixing. The inverter includes a bridge arm unit and a resonant unit, and the bridge arm unit and the resonant unit are connected via a balanced inductor.

Description

Technical Field

[0001] The present invention relates to a balanced inductor and a preparation method thereof, and in particular to an inductor unit and a preparation method thereof, a balanced inductor and a preparation method thereof, and a high-frequency inverter. Background Art

[0002] With the advancement of new energy technologies, high-power wireless charging is becoming increasingly mainstream, and inverters are an integral part of many wireless charging systems. As charging power increases, inverters must adopt a multi-arm topology. The parallel output of multiple arms requires balanced inductors for current sharing.

[0003] However, since the output balancing inductor is a device with special parameters, and high-power balancing inductors are even more special, in the existing technology, its winding method is complicated, the volume after manufacture is large, and winding errors are very likely to occur, which does not meet the design requirements. Therefore, it is difficult to promote it commercially and it is difficult to meet the design requirements. Summary of the Invention

[0004] The present invention aims to solve the technical problems in the prior art, such as the complex winding method of the output balanced inductor, the large size, the easy winding error, the difficulty in commercial promotion, and the difficulty in meeting design requirements. The present invention provides an inductor unit and a preparation method thereof, a balanced inductor and a preparation method thereof, and a high-frequency inverter.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] An inductor unit is special in that it comprises two insulated wires and two magnetic rings;

[0007] The two magnetic rings are arranged opposite to each other;

[0008] Each magnetic ring is divided into four quadrants by a plane rectangular coordinate system with the center of the magnetic ring as the origin; of the two magnetic rings, the portion of one magnetic ring located in the first and fourth quadrants and the portion of the other magnetic ring located in the second and third quadrants are wound around an insulating wire together;

[0009] On each of the magnetic rings, gaps are left at both ends of one insulating wire coiled portion and at both ends of another insulating wire coiled portion.

[0010] Furthermore, it also includes a voltage testing device and a detection coil wound on the magnetic ring;

[0011] The detection coil is located at the gap between the two coiled insulating wire parts on each magnetic ring, and both ends of the detection coil are connected to the voltage testing device.

[0012] Furthermore, the insulated wire is a multi-strand insulated wire.

[0013] At the same time, the present invention provides a method for preparing the above-mentioned inductor unit, which is special in that it includes the following steps:

[0014] S1, place two magnetic rings opposite to each other;

[0015] S2, taking the center of each magnetic ring as the origin, divide the magnetic ring into four quadrants using a plane rectangular coordinate system;

[0016] S3, take an insulated wire and coil it along the first and fourth quadrants of the first magnetic ring, and then coil it along the second and third quadrants of the second magnetic ring;

[0017] Take another insulated wire and coil it along the portion of the first magnetic ring located in the second and third quadrants, and then continue to coil it along the portion of the second magnetic ring located in the first and fourth quadrants;

[0018] After coiling is completed, leave the two ends of the two insulated wires exposed to obtain an inductor unit.

[0019] The present invention also provides a balanced inductor, which is special in that it includes a fixing member and at least one inductor unit as described above;

[0020] The magnetic rings of each inductor unit are arranged parallel to each other; and the magnetic rings are connected into a whole through fixing members.

[0021] Furthermore, the fixing member includes a first fixing component and a second fixing component;

[0022] The first fixing assembly and the second fixing assembly are respectively located at the gap between the two ends of the coiled parts of the two insulating wires on each magnetic ring.

[0023] Furthermore, the first fixing assembly includes a first fixing upper cover and a first fixing lower cover that are buckled with each other;

[0024] On the surface of the first fixed lower cover facing the first fixed upper cover, first receiving grooves are provided along the extending direction thereof, the number of which is equal to the number of the magnetic rings;

[0025] On the surface of the first fixed upper cover facing the first fixed lower cover, second grooves are provided along its extension direction, the number of which is equal to the number of magnetic rings; above each second groove on the first fixed upper cover, a connector hole is provided for installing a connector and connecting with the end of the insulated wire;

[0026] The first containing groove and the second containing groove are arranged correspondingly, and the containing cavity formed by the first containing groove and the second containing groove is adapted to the ring width and thickness of the magnetic ring;

[0027] On each of the magnetic rings, a gap between the two ends of the coiled portions of the two insulating wires is located in a cavity formed by the first groove and the second groove.

[0028] Furthermore, the second fixing assembly includes a second fixing upper cover and a second fixing lower cover that are buckled with each other;

[0029] On the surface of the second fixed upper cover facing the second fixed lower cover, third receiving grooves are provided along the extending direction thereof, the number of which is equal to the number of the magnetic rings;

[0030] On the surface of the second fixed lower cover facing the second fixed upper cover, fourth receiving grooves are provided along the extending direction thereof, the number of which is equal to the number of the magnetic rings;

[0031] The first containing groove, the second containing groove, the third containing groove and the fourth containing groove are all arranged correspondingly, and the containing cavity formed by the third containing groove and the fourth containing groove is adapted to the ring width and thickness of the magnetic ring;

[0032] On each of the magnetic rings, a gap between the two ends of the coiled portions of the two insulating wires is located in a cavity formed by the third and fourth grooves.

[0033] The present invention also provides a method for preparing the above-mentioned balanced inductor, which is special in that it includes the following steps:

[0034] S1. Place the magnetic rings of each inductor unit in the cavity formed by the first and second slots, and the cavity formed by the third and fourth slots, respectively. Snap the first fixed upper cover and the first fixed lower cover together, and snap the second fixed upper cover and the second fixed lower cover together, connecting the magnetic rings into a whole.

[0035] S2, taking the center of each magnetic ring as the origin, divide the magnetic ring into four quadrants using a plane rectangular coordinate system;

[0036] S3, take an insulated wire and coil it along the first and fourth quadrants of the first magnetic ring, and then coil it along the second and third quadrants of the second magnetic ring;

[0037] Take another insulated wire and coil it along the portion of the first magnetic ring located in the second and third quadrants, and then continue to coil it along the portion of the second magnetic ring located in the first and fourth quadrants;

[0038] After coiling is complete, leave both ends of the two insulated wires free;

[0039] S4, completing the winding of the insulation wires of the two magnetic rings in each inductor unit according to step S3;

[0040] S5, installing a connector at each connector hole, connecting the wires left at both ends of the two insulated wires on each magnetic ring in step S3 to the connector, and completing the preparation of the balanced inductor.

[0041] Finally, the present invention also provides a high-frequency inverter, including a bridge arm unit and a resonance unit, the special feature of which is that the bridge arm unit and the resonance unit are connected via the balanced inductor as described above.

[0042] Compared with the prior art, the present invention has the following beneficial effects:

[0043] 1. The inductor unit of the present invention is formed by a group of two wound magnetic rings. Each inductor unit only needs two wires to be wound, without redundant wiring, and has a simple structure and is easy to promote and use.

[0044] 2. In the present invention, a detection coil is wound around the magnetic ring of the inductor unit, which, together with a voltage testing device, can be used to detect the output characteristics of the balanced inductor and determine whether the current impact between the two insulated wires on each magnetic ring exceeds expectations.

[0045] 3. The insulated wire in the present invention can be a multi-strand insulated wire so as not to produce a skin effect.

[0046] 4. In the preparation method of the inductor unit of the present invention, when winding the insulated wire, it is first coiled on half a circle of a magnetic ring, and then continuously coiled to the opposite half circle of the other magnetic ring. The two insulated wires are coiled staggered. The winding method is simple, easy to execute, not prone to errors, easy to promote and use commercially, and easy to meet design requirements. The number of coiling turns can be determined according to usage needs.

[0047] 5. The balanced inductor of the present invention secures at least one inductor unit via a fixing member, making it suitable for use with multiple parallel outputs. It features a simple structure and proven superior performance. The balanced inductor is highly integrated, compact, and easy to install. The inductor unit, as its core component, possesses all of the aforementioned advantages.

[0048] 6. The fixing parts used in the balancing inductor of the present invention are fixedly connected by snapping, which is convenient for installation, disassembly and maintenance; the connector holes and the receiving slots are arranged correspondingly, which facilitates wiring and avoids miswiring during wiring. In addition, the insulated wire is also easy to install and fix.

[0049] 7. In the preparation method of the balanced inductor of the present invention, the magnetic ring can be positioned by the receiving groove. When the insulating wire is wound, one magnetic ring is first wound half a circle, and then continuously wound to the opposite half circle of the other magnetic ring. The insulating wire winding method is simple, with fewer winding and wiring operations, easy to perform, less prone to errors, and easy to promote and use.

[0050] 8. In the high-frequency inverter of the present invention, the bridge arm unit and the resonant unit are connected through the balanced inductor of the present invention, which can output the high pulse energy output by the bridge arm unit in parallel, playing the role of balancing the output current of each bridge arm unit. When the output currents of the two adjacent half bridge arms are not equal, it plays the role of an inductor, limiting the current of one of the paths to avoid excessive current. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 is a schematic diagram of an embodiment of an inductor unit of the present invention;

[0052] Figure 2 An exploded view of an embodiment of a balanced inductor according to the present invention (the insulating wire wound around the magnetic ring is not shown);

[0053] Figure 3 Schematic diagram of a balanced inductor embodiment of the present invention (the insulating wire wound around the magnetic ring is not shown);

[0054] Figure 4 Schematic diagram of partial circuit connections of a high-frequency inverter embodiment of the present invention.

[0055] Among them, 1-insulated wire, 2-magnetic ring, 3-detection coil, 4-fixing part, 401-first fixed component, 4011-first fixed upper cover, 4012-first fixed lower cover, 4013-first containing groove, 4014-second containing groove, 4015-connector hole, 402-second fixed component, 4021-second fixed upper cover, 4022-second fixed lower cover, 4023-third containing groove, 4024-fourth containing groove, 5-inductor unit. DETAILED DESCRIPTION

[0056] The technical solutions of the present invention will be described clearly and completely below in conjunction with the embodiments of the present invention and the accompanying drawings. Obviously, the described embodiments are not intended to limit the present invention.

[0057] Based on the problem that existing balancing inductors are complex to wind and difficult to promote and use, the present invention proposes an output balancing inductor suitable for high-power wireless charging inverters. The inductor unit preparation method is simple, and the high-frequency inverter using this output balancing inductor has excellent performance.

[0058] like Figure 1, is an embodiment of the inductor unit 5 of the present invention, comprising two insulating wires 1 and two magnetic rings 2. The two magnetic rings 2 are parallel to each other and arranged opposite to each other. To clearly illustrate the specific arrangement of the two insulating wires 1 on the inductor unit 5, each magnetic ring 2 is divided into four quadrants by a plane rectangular coordinate system with the center of the magnetic ring 2 as the origin. The spatial division of the various regions of the magnetic ring is only for the purpose of accurately illustrating the winding method of the two insulating wires 1 and does not limit the structure of the magnetic rings 2 in the present invention. Of the two magnetic rings 2, the portion of the first magnetic ring 2 located in the first and fourth quadrants and the portion of the second magnetic ring 2 located in the second and third quadrants are jointly wound around an insulating wire 1, and the portion of the first magnetic ring 2 located in the second and third quadrants and the portion of the second magnetic ring 2 located in the first and fourth quadrants are jointly wound around an insulating wire 1. The two insulating wires 1 are arranged in a staggered manner. The insulating wire can be a multi-strand insulating wire, and there is no skin effect. In addition, gaps are left at both ends of the coiled portion of one insulating wire 1 and at both ends of the coiled portion of the other insulating wire 1 on each magnetic ring 2, i.e., two gaps are left on each magnetic ring 2. The number of turns and coil density of the insulating wire 1, as well as the size and material of the magnetic ring 1, can be selected and adjusted according to actual use needs without limitation. A detection coil 3 can also be wound around each magnetic ring 2 of the inductor unit 5. The detection coil 3 is located in the gap between the two coiled portions of the insulating wire 1 on each magnetic ring 2, and can be located at either of the two gaps. The ends of the detection coil 3 are connected to a voltage tester, which can be implemented using a corresponding operational amplifier circuit. When the currents in the two insulating wires 1 on the magnetic ring 2 are different, a current backlash occurs, causing the magnetic ring 2 to be magnetized and generate a voltage. The voltage tester can test the magnitude of the voltage and also simultaneously detect the direction of the voltage, determining whether the voltage is positive or negative based on the direction. By comparing the voltage value with a preset value, it is determined whether the current backlash has exceeded expectations. The detection coil 3 detects the output characteristics of the balanced inductor when the inductor unit 5 is used to balance the inductor. The output of the detection coil 3 can also be connected to the control terminal to control the opening of the bridge arm to prevent a certain output circuit from being unstable and causing other bridge arms to be overloaded. In this way, other circuits can be quickly disconnected to prevent damage to other circuits. The provision of the detection coil 3 is a preferred method. In other embodiments of the present invention, the detection coil 3 can also be wound.

[0059] The specific preparation method of the above-mentioned inductor unit 5 is as follows: two magnetic rings 2 are placed opposite to each other, an insulating wire 1 is taken, and it is coiled along the part of the first magnetic ring 2 located in the first quadrant and the fourth quadrant, and then it is continuously coiled along the part of the second magnetic ring 2 located in the second quadrant and the third quadrant; another insulating wire 1 is taken, and it is coiled along the part of the first magnetic ring 2 located in the second quadrant and the third quadrant, and then it is continuously coiled along the part of the second magnetic ring 2 located in the first quadrant and the fourth quadrant; after the coiling is completed, the two ends of the two insulating wires 1 are left out to obtain an inductor unit 5, and the left ends of the two insulating wires 1 are used for subsequent wiring.

[0060] Based on the above-mentioned inductor unit 5, the present invention proposes a balanced inductor, including a fixing member 4 and three of the above-mentioned inductor units 5. In actual use, the number of inductor units 5 is not limited and can be selected according to the application needs. All magnetic rings 2 of each inductor unit 5 are arranged parallel to each other, and the magnetic rings 2 are connected as a whole by the fixing member 4 to form a complete balanced inductor. Figure 2 and Figure 3 As shown, taking the fixing member structure in an embodiment of the present invention as an example, the specific connection structure of the balanced inductor of the present invention is described in detail. The fixing member 4 includes a first fixing component 401 and a second fixing component 402. The first fixing component 401 includes a first fixing upper cover 4011 and a first fixing lower cover 4012. The second fixing component 402 includes a second fixing upper cover 4021 and a second fixing lower cover 4022. The first fixing upper cover 4011 and the first fixing lower cover 4012 are buckled together, and the second fixing upper cover 4021 and the second fixing lower cover 4022 are also buckled together. Each magnetic ring 2 is fixed by buckling. The buckling points of the first fixing upper cover 4011 and the first fixing lower cover 4012 and the buckling points of the second fixing upper cover 4021 and the second fixing lower cover 4022 are respectively located at two gaps between the two insulated wires 1 on each magnetic ring 2, and do not affect the winding of the insulated wires 1.

[0061] Six first receiving grooves 4013 are provided on the surface of the first fixed lower cover 4012 facing the first fixed upper cover 4011 along its extension direction, and six second receiving grooves 4014 are provided on the surface of the first fixed upper cover 4011 facing the first fixed lower cover 4012 along its extension direction. A connector hole 4015 is provided above each second receiving groove 4014 on the first fixed upper cover 4011 for mounting a connector and connecting it to the end of the insulated wire 1. The connector hole 4015 is structurally adapted to the shape of the connector to be used and can be adjusted according to the shape of the connector to ensure that the connector can be mounted on the first fixed assembly 401. The first receiving grooves 4013 and the second receiving grooves 4014 are provided in a corresponding manner, and the cavity formed by the first receiving grooves 4013 and the second receiving grooves 4014 are adapted to the width of the magnetic ring 2. On the surface of the second fixed upper cover 4021 facing the second fixed lower cover 4022, six third receiving grooves 4023 are provided along its extension direction. On the surface of the second fixed lower cover 4022 facing the second fixed upper cover 4021, six fourth receiving grooves 4024 are provided along its extension direction. The first receiving groove 4013, the second receiving groove 4014, the third receiving groove 4023, and the fourth receiving groove 4024 are all arranged correspondingly, so that the magnetic ring 2 remains in a vertical state when fixed, and it is also convenient to keep each magnetic ring 2 parallel to each other during installation. The cavity formed by the third receiving groove 4023 and the fourth receiving groove 4024 is adapted to the ring width of the magnetic ring 2. This is only one embodiment of the present invention for fixing each magnetic ring 2. In actual use, other fixing methods can also be adopted. The snap-fit fixing method in this embodiment is easy to disassemble and facilitate subsequent maintenance and replacement. The second fixed lower cover 4022 can also be provided with fixing screw holes to facilitate fixing the balancing inductor to the chassis via fixing screws.

[0062] When preparing the balanced inductor, the magnetic rings 2 of the six inductor units 5 are placed in the cavity formed by the first and second grooves 4013, 4014, and the cavity formed by the third and fourth grooves 4023, 4024, respectively. The first fixed upper cover 4011 and the first fixed lower cover 4012 are fastened together, and the second fixed upper cover 4021 and the second fixed lower cover 4022 are fastened together to connect the magnetic rings 2 into a whole. An insulated wire 1 is passed through the connector hole 4015 on the first fixed upper cover 4011, and is coiled along the portion of the first magnetic ring 2 located in the first and fourth quadrants, and then continuously along the second magnetic ring 2. The portions located in the second and third quadrants are coiled, and then the insulated wire 1 is passed through the second connector hole 4015. The two ends of the insulated wire 1 are welded to the two connector holes 4015. Another insulated wire 1 is then coiled along the portions located in the second and third quadrants of the first magnetic ring 2, and then along the portions located in the first and fourth quadrants of the second magnetic ring 2. Similarly, after coiling is completed, the two ends of the insulated wire 1 are left free and placed in the connector holes 4015. This completes the winding of one inductor unit 5. Following the same method, the insulated wire 1 of the two magnetic rings 2 in each inductor unit 5 is coiled. Finally, a connector is installed in each connector hole 4015, and the free wire is connected to the connector to complete the preparation of the balanced inductor. If a detection coil 3 is required on each magnetic ring 2, a detection coil 3 can be wound around each magnetic ring 2. The detection coil 3 is wound at either of the two gaps between the two insulated wires 1 on the magnetic ring 2. The number of turns and the gap of the detection coil 3 can be adjusted according to actual needs.

[0063] The manufacturing method of this balancing inductor is simple. Each inductor unit 5 only requires winding two insulated wires 1. The resulting balanced inductor has a high degree of integration, is compact, and is easy to install and operate, while also saving installation space. The provision of connector holes 4015 also facilitates connector installation and securing the insulated wires 1. Furthermore, the hollow design of each inductor unit 5 in the balancing inductor facilitates heat dissipation during operation.

[0064] The balancing inductor of the present invention is particularly suitable for high-power wireless charging inverters, such as Figure 4FIG. 1 shows an embodiment of an inverter using the balanced inductor of the present invention. Six bridge arms are used as bridge arm units, and the bridge arm units are connected to the resonant unit via a balanced inductor comprising three inductor units 5. The number of bridge arms in the bridge arm unit and the number of inductor units in the balanced inductor can be adjusted according to power requirements. Each half-bridge circuit in the bridge arm includes two alternately conducting MOS tubes, using MOSFETs or MOSFETs. The six bridge arms simultaneously output high-speed pulse energy to drive the downstream LC series network. The balanced inductor, comprising six magnetic rings, connects the six high-speed pulse energy channels in parallel, balancing the currents in each channel. For example, the second magnetic ring 2 in the second magnetic ring 2 carries the currents flowing through the two coils of the first half-bridge circuit after the two MOS tubes are conducting, and the currents flowing through the two MOS tubes in the second half-bridge circuit after the two MOS tubes are conducting. When the currents conflict and the output currents of the two bridge arms are unequal, the second magnetic ring 2 acts as an inductor, limiting the excessive current in one channel.

[0065] The above descriptions are merely embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any equivalent structural transformations made using the contents of the present invention's description and drawings, or directly or indirectly applied to other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A balanced inductor, characterized in that: It includes a fixing member (4) and an inductor unit (5); The inductance unit (5) comprises two insulating wires (1), two magnetic rings (2), a voltage testing device, and a detection coil (3) wound around the magnetic rings (2); The two magnetic rings (2) are arranged opposite to each other; Each magnetic ring (2) is divided into four quadrants by a plane rectangular coordinate system with the center of the magnetic ring (2) as the origin; an insulating wire (1) is coiled along the portion of the first magnetic ring (2) located in the first quadrant and the fourth quadrant, and then continuously coiled along the portion of the second magnetic ring (2) located in the second quadrant and the third quadrant; another insulating wire (1) is coiled along the portion of the first magnetic ring (2) located in the second quadrant and the third quadrant, and then continuously coiled along the portion of the second magnetic ring (2) located in the first quadrant and the fourth quadrant; On each of the magnetic rings (2), gaps are left between the two ends of the coiled portion of one insulating wire (1) and the two ends of the coiled portion of another insulating wire (1); The detection coil (3) is located in the gap between the coiled parts of the two insulating wires (1) on each magnetic ring (2), and both ends of the detection coil (3) are connected to a voltage testing device; the voltage testing device is implemented using a corresponding operational amplifier circuit; The magnetic rings (2) of each inductance unit (5) are arranged parallel to each other; and the magnetic rings (2) are connected into a whole via a fixing member (4).

2. The balanced inductor according to claim 1, wherein: The insulated wire (1) is a multi-strand insulated wire.

3. A balanced inductor according to claim 1 or 2, characterized in that: The fixing member (4) comprises a first fixing component (401) and a second fixing component (402); The first fixing component (401) and the second fixing component (402) are respectively located at the gap between the two ends of the coiled parts of the two insulating wires (1) on each magnetic ring (2).

4. The balanced inductor according to claim 3, wherein: The first fixing assembly (401) comprises a first fixing upper cover (4011) and a first fixing lower cover (4012) that are buckled together; On the surface of the first fixed lower cover (4012) facing the first fixed upper cover (4011), first receiving grooves (4013) are provided along the extension direction thereof, the number of which is equal to the number of the magnetic rings (2); On the surface of the first fixed upper cover (4011) facing the first fixed lower cover (4012), second receiving grooves (4014) are provided along its extension direction, the number of which is equal to the number of the magnetic rings (2); a connector hole (4015) is provided above each second receiving groove (4014) on the first fixed upper cover (4011) for installing a connector and connecting to the end of the insulated wire (1); The first containing groove (4013) and the second containing groove (4014) are arranged correspondingly, and the containing cavity formed by the first containing groove (4013) and the second containing groove (4014) is adapted to the ring width and thickness of the magnetic ring (2); On each of the magnetic rings (2), a gap between the two ends of the coiled portion of the two insulating wires (1) is located in a cavity formed by the first containing groove (4013) and the second containing groove (4014).

5. The balanced inductor according to claim 4, wherein: The second fixing assembly (402) comprises a second fixing upper cover (4021) and a second fixing lower cover (4022) that are buckled together; On the surface of the second fixed upper cover (4021) facing the second fixed lower cover (4022), third receiving grooves (4023) are provided along the extension direction thereof, the number of which is equal to the number of the magnetic rings (2); On the surface of the second fixed lower cover (4022) facing the second fixed upper cover (4021), fourth receiving grooves (4024) are provided along the extension direction thereof, the number of which is equal to the number of the magnetic rings (2); The first containing groove (4013), the second containing groove (4014), the third containing groove (4023) and the fourth containing groove (4024) are all arranged correspondingly, and the containing cavity formed by the third containing groove (4023) and the fourth containing groove (4024) is adapted to the ring width and thickness of the magnetic ring (2); On each of the magnetic rings (2), a gap between the two ends of the coiled portion of the two insulating wires (1) is located in a cavity formed by the third containing groove (4023) and the fourth containing groove (4024).

6. A method for preparing a balanced inductor, characterized in that: The method for preparing the balanced inductor according to claim 5 comprises the following steps: S1, placing the magnetic ring (2) in the cavity formed by the first containing groove (4013) and the second containing groove (4014), and in the cavity formed by the third containing groove (4023) and the fourth containing groove (4024), respectively, and buckling the first fixed upper cover (4011) and the first fixed lower cover (4012), and buckling the second fixed upper cover (4021) and the second fixed lower cover (4022), respectively, to connect the magnetic rings (2) into a whole; S2, taking the center of each magnetic ring (2) as the origin, the magnetic ring (2) is divided into four quadrants by a plane rectangular coordinate system; S3, take an insulated wire (1), coil it along the portion of the first magnetic ring (2) located in the first and fourth quadrants, and then coil it along the portion of the second magnetic ring (2) located in the second and third quadrants; Take another insulated wire (1), coil it along the portion of the first magnetic ring (2) located in the second and third quadrants, and then continue to coil it along the portion of the second magnetic ring (2) located in the first and fourth quadrants; After coiling is completed, leave the two ends of the two insulated wires (1) free; S4, completing the winding of each inductor unit (5) according to step S3; S5, installing a connector at each connector hole (4015), connecting the wires left at both ends of the two insulated wires (1) on each magnetic ring (2) in step S3 to the connector, and completing the preparation of the balanced inductor.

7. A high-frequency inverter, comprising a bridge arm unit and a resonant unit, characterized in that: The bridge arm unit and the resonance unit are connected via the balanced inductor as described in any one of claims 1-5.

Images