Drive conversion circuit, high-voltage system and automobile

Abstract

Disclosed in the present application are a drive conversion circuit, a high-voltage system and an automobile. The drive conversion circuit comprises an on-board charging circuit and a motor drive circuit; the on-board charging circuit comprises a voltage conversion circuit and a rectifier-inverter circuit, the voltage conversion circuit being configured to be connected to an alternating current power supply; the motor drive circuit comprises the rectifier-inverter circuit and a motor winding, the rectifier-inverter circuit being connected to the voltage conversion circuit and the motor winding; the rectifier-inverter circuit is configured to be connected to a power battery, and is used for rectifying an alternating current output by the voltage conversion circuit, so as to output a direct current to the power battery, or inverting a direct current output by the power battery, so as to output an alternating current to the motor winding. The drive conversion circuit achieves reduction of the number of electrical components and wiring harnesses by means of functional combination of electrical components and modification of the circuit structure, thereby meeting the requirement for integration and helping to save costs.

Description

Driving conversion circuit, high-voltage system and automobile

[0001] Cross-reference to related applications

[0002] The present application claims priority to the Chinese patent application No. 202411084101.1, filed on August 8, 2024, and entitled "Driving conversion circuit, high-voltage system and automobile", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0003] The present application relates to the technical field of electric vehicles, in particular to a driving conversion circuit, a high-voltage system and an automobile. BACKGROUND

[0004] The high-voltage system is the core system of an electric vehicle, generally including a power battery, a vehicle-mounted charging circuit and a motor driving circuit. The existing vehicle-mounted charging circuit and motor driving circuit are generally independently arranged, and the degree of integration is low, resulting in problems of large volume, heavy weight and high cost of the high-voltage system.

[0005] As shown in FIG. 1, the vehicle-mounted charging circuit includes a voltage conversion circuit and a rectifier circuit connected in sequence. The input end of the voltage conversion circuit is used to connect an alternating current power supply, and the output end of the voltage conversion circuit is connected to the power battery through the rectifier circuit. The working process is as follows: the alternating current output by the alternating current power supply is subjected to voltage conversion by the voltage conversion circuit and rectification by the rectifier circuit, so as to convert low-voltage alternating current into stable high-voltage direct current, thereby charging the power battery. The motor driving circuit includes an inverter circuit and a motor winding. The input end of the inverter circuit is used to connect the power battery, and the output end of the inverter circuit is used to connect the motor winding. The working process is as follows: the direct current output by the power battery is converted by the inverter circuit to form alternating current, thereby driving the motor winding to rotate, so as to make the automobile run. The independent arrangement of the vehicle-mounted charging circuit and the motor driving circuit has low degree of integration, and the whole system has problems of large volume, heavy weight and high cost. SUMMARY

[0006] The present application provides a driving conversion circuit, a high-voltage system and an automobile to solve the problem of low degree of integration of the existing high-voltage system.

[0007] A driving conversion circuit includes a vehicle-mounted charging circuit and a motor driving circuit.

[0008] The vehicle-mounted charging circuit includes a voltage conversion circuit and a rectifier-inverter circuit, and the voltage conversion circuit is adapted to connect an alternating current power supply.

[0009] The motor driving circuit includes the rectifier-inverter circuit and a motor winding.

[0010] The rectification-inversion circuit is connected with the voltage conversion circuit and the motor winding, and is adapted to be connected with a power battery, for rectifying alternating current output by the voltage conversion circuit and outputting direct current to the power battery, or inverting direct current output by the power battery and outputting alternating current to the motor winding.

[0011] Preferably, the rectification-inversion circuit comprises at least two first bridge arms, each of which comprises a first upper bridge tube and a first lower bridge tube arranged in series, and a connection node between the first upper bridge tube and the first lower bridge tube is a midpoint of the first bridge arm.

[0012] The at least two first upper bridge tubes are used to connect a positive electrode of the power battery.

[0013] The at least two first lower bridge tubes are used to connect a negative electrode of the power battery.

[0014] The midpoints of the at least two first bridge arms are connected with the voltage conversion circuit and the motor winding.

[0015] Preferably, the voltage conversion circuit comprises a transformer.

[0016] The transformer is adapted to be connected with an alternating current power supply and connected with the rectification-inversion circuit.

[0017] Preferably, the drive conversion circuit further comprises an isolation circuit.

[0018] The isolation circuit is adapted to be connected with the alternating current power supply and connected with the transformer.

[0019] Preferably, the isolation circuit comprises a PFC circuit and a first inversion circuit.

[0020] An input end of the PFC circuit is adapted to be connected with the alternating current power supply, and an output end of the PFC circuit is connected with the transformer through the first inversion circuit.

[0021] Preferably, the transformer comprises a stator assembly, the stator assembly comprises a magnetic core, a first winding and a second winding arranged on the magnetic core; the first winding is connected with an output end of the first inversion circuit; and the second winding is connected with the rectification-inversion circuit.

[0022] Preferably, the second winding is the motor winding, and the first winding is further adapted to be connected with the power battery.

[0023] Preferably, a first input end of the first inversion circuit is adapted to be connected with a positive electrode of the power battery, and a second input end of the first inversion circuit is adapted to be connected with a negative electrode of the power battery.

[0024] Preferably, the first end of the first winding is adapted to be connected to the positive pole of the power battery through a first switch; and the second end of the first winding is adapted to be connected to the negative pole of the power battery through a second switch.

[0025] Preferably, the second winding is the motor winding.

[0026] The transformer further comprises a rotor assembly, and a permanent magnet is arranged in the rotor assembly.

[0027] Preferably, the motor winding comprises at least two motor coils.

[0028] The first end of each motor coil is connected to the midpoint of one first bridge arm, and the second ends of the at least two motor coils are connected to each other.

[0029] Preferably, the first inverter circuit comprises two second bridge arms, each second bridge arm comprises a second upper bridge tube and a second lower bridge tube arranged in series, and the connection node between the second upper bridge tube and the second lower bridge tube is the midpoint of the second bridge arm.

[0030] One end of each second upper bridge tube is used for connecting the first end of the alternating current power supply.

[0031] One end of each second lower bridge tube is used for connecting the second end of the alternating current power supply.

[0032] The midpoints of the two second bridge arms are respectively connected to the two input ends of the first winding.

[0033] Preferably, the drive conversion circuit further comprises a resonance circuit, and the resonance circuit is arranged between the output end of the first inverter circuit and the input end of the first winding.

[0034] Preferably, the resonance circuit comprises a resonance inductor.

[0035] Preferably, the drive conversion circuit further comprises a DC blocking capacitor, and the DC blocking capacitor is arranged between the output end of the first inverter circuit and the input end of the first winding.

[0036] A high-voltage system comprising a power battery and the above drive conversion circuit.

[0037] The two ends of the power battery are connected to the rectifier-inverter circuit.

[0038] An automobile comprising the above high-voltage system.

[0039] The driving conversion circuit, the high-voltage system and the automobile adopt an integrated scheme of the on-board charging circuit and the motor driving circuit, specifically, rectifier circuits between the transformer and the power battery and inverter circuits between the power battery and the motor winding are integrated together to form a rectifier-inverter circuit, the functions of electrical elements are combined and the circuit structure is changed, the electrical elements and the wiring harness are reduced, the integration requirement is met, and the cost is saved, the weight and the volume are reduced. BRIEF DESCRIPTION OF DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and all other drawings obtained by those of ordinary skill in the art without creative effort based on these drawings also belong to the protection scope of the present application.

[0041] Fig. 1 is a circuit schematic diagram of a high-voltage system in the prior art;

[0042] Fig. 2 is a schematic diagram of a high-voltage system in an embodiment of the present application;

[0043] Fig. 3 is a circuit diagram of a high-voltage system in an embodiment of the present application;

[0044] Fig. 4 is a timing diagram of the high-voltage system in Fig. 3 for realizing a charging function;

[0045] Fig. 5 is a timing diagram of the high-voltage system in Fig. 3 for realizing a driving function;

[0046] Fig. 6 is another timing diagram of the high-voltage system in Fig. 3 for realizing a driving function.

[0047] Fig. 7 is another circuit diagram of a high-voltage system in an embodiment of the present application;

[0048] Legend: 1, voltage conversion circuit; T1, transformer; 11, first winding; 12, second winding; 2, rectifier circuit; 3, inverter circuit; 4, motor winding; 5, rectifier-inverter circuit; 6, power battery; 7, alternating current power supply; 8, isolation circuit; 81, FPC circuit; 82, first inverter circuit. DETAILED DESCRIPTION

[0049] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort belong to the protection scope of the present application.

[0050] It is to be understood that the application can assume various alternative embodiments, and that it is not limited to what is described in the specification. Rather, the specific examples of embodiment disclosed herein are illustrative of various embodiments of the present application. Thus, the scope of the present application should not be deemed limited by the description of the embodiments in the specification, but rather by the claims that follow, affixed hereto. In the drawings, like numerals refer to like elements through out the several views.

[0051] It will be understood that when an element or layer is referred to as being "on" or "connected to" another element or layer, it can be directly on or connected to the other element or layer or intervening elements or layers can be present. In contrast, when an element is referred to as being "directly on" or "directly connected to" another element or layer, there are no intervening elements or layers present. It will also be understood that, when a term is used herein that is defined as having a certain meaning in the art, but is explicitly defined herein as having a different meaning, the terminology is used with the different meaning herein as long as the new and unexpected

[0052] Spatially relative terms, such as "beneath", "below", "lower", "under", "above", "upper" and the like, can be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientations depicted in the figures. For example, if a device in the figures is inverted, then a dependent element or feature it is described as "below" or "beneath" another element or feature could be oriented "above" and "over" the other element or feature. Thus, the exemplary term "below" can encompass both an orientation of above and below. The device can be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

[0053] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising", when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. As used herein the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0054] For a thorough understanding of the application, detailed descriptions will be made in the following description with specific structures and steps to illustrate the technical solutions proposed by the application. The preferred embodiments of the application are described in detail as follows, however, in addition to these detailed descriptions, the application can also have other implementations.

[0055] The embodiment of the application provides a drive conversion circuit, as shown in FIG. 1 and FIG. 2, which comprises an on-board charging circuit and a motor drive circuit;

[0056] The on-board charging circuit comprises a voltage conversion circuit 1 and a rectifier-inverter circuit 5, wherein the voltage conversion circuit 1 is adapted to be connected with an alternating current power supply 7;

[0057] The motor drive circuit comprises the rectifier-inverter circuit 5 and a motor winding 4;

[0058] The rectifier-inverter circuit 5 is connected with the voltage conversion circuit 1 and the motor winding 4, and is adapted to be connected with a power battery 6, for rectifying the alternating current output by the voltage conversion circuit 1 to output direct current to the power battery 6, or inverting the direct current output by the power battery 6 to output alternating current to the motor winding 4.

[0059] The on-board charging circuit is a circuit for charging the vehicle. The motor drive circuit is a circuit for driving and controlling the motor. The voltage conversion circuit 1 is a circuit for voltage conversion. The rectifier-inverter circuit 5 is a circuit that can realize both inversion and rectification, which is a component that can realize the functions of rectifier and inverter, and can realize both functions, which helps to reduce the number of components in the circuit, so as to meet the purposes of high integration, light weight and low cost.

[0060] As an example, when the voltage conversion circuit 1 is connected with the alternating current power supply 7 and the two connection ends of the rectifier-inverter circuit 5 are connected with the power battery 6, the drive conversion circuit is controlled to work, so that the alternating current power supply 7 can charge the power battery 6, and the specific control process is as follows: the alternating current voltage output by the alternating current power supply 7 is subjected to voltage conversion by the voltage conversion circuit 1 and rectification by the rectifier-inverter circuit 5, so as to convert the low-voltage alternating current into stable high-voltage direct current, and then input the high-voltage direct current to the power battery 6 to charge the power battery 6.

[0061] As an example, when the motor winding 4 is connected with the power battery 6 through the rectifier-inverter circuit 5, the power battery 6 can control the motor winding 4 to rotate to complete the driving control function, and the specific control process is as follows: the direct current output by the power battery 6 is subjected to rectification by the rectifier-inverter circuit 5, so as to convert the direct current output by the power battery 6 into alternating current, and then output the alternating current to the motor winding 4 to drive the motor winding 4 to work.

[0062] In the embodiment, the drive conversion circuit integrates the on-board charging circuit and the motor drive circuit, specifically, the rectifier circuit between the voltage conversion circuit 1 and the power battery 6 and the inverter circuit between the power battery 6 and the motor winding 4 are integrated together to form the rectifier-inverter circuit 5, so as to realize the function combination of electrical elements and the change of circuit structure, reduce the electrical elements and wiring harness, meet the integration requirement, and help save cost, reduce weight and volume.

[0063] In an embodiment, as shown in FIG. 3, the rectifier-inverter circuit 5 includes at least two first bridge arms, each of the first bridge arms includes first upper bridge tubes Q51 / Q53 / Q55 and first lower bridge tubes Q52 / Q54 / Q56 arranged in series, and the connection node between the first upper bridge tubes Q51 / Q53 / Q55 and the first lower bridge tubes Q52 / Q54 / Q56 is the midpoint of the first bridge arm.

[0064] The at least two first upper bridge tubes Q51 / Q53 / Q55 are used for connecting the positive electrode of the power battery 6.

[0065] The at least two first lower bridge tubes Q52 / Q54 / Q56 are used for connecting the negative electrode of the power battery 6.

[0066] The midpoint of the at least two first bridge arms is connected with the voltage conversion circuit 1 and the motor winding 4.

[0067] Wherein, the first upper bridge tube Q51 / Q53 / Q55 is a switch tube for connecting the positive electrode of the power battery 6, the first lower bridge tube Q52 / Q54 / Q56 is a switch tube for connecting the negative electrode of the power battery 6, and the first upper bridge tube Q51 / Q53 / Q55 and the first lower bridge tube Q52 / Q54 / Q56 can be but are not limited to IGBT tubes.

[0068] As an example, the rectification-inversion circuit 5 comprises at least two first bridge arms, each of which comprises a first upper bridge tube Q51 / Q53 / Q55 and a first lower bridge tube Q52 / Q54 / Q56 arranged in series, the at least two first upper bridge tubes Q51 / Q53 / Q55 are used for connecting the positive pole of the power battery 6, the at least two first lower bridge tubes Q52 / Q54 / Q56 are used for connecting the negative pole of the power battery 6, and the middle points of the at least two first bridge arms are connected with the voltage conversion circuit 1 and the motor winding 4. For example, when the first upper bridge tube Q51 / Q53 / Q55 and the first lower bridge tube Q52 / Q54 / Q56 are two IGBT tubes of the same type, the first end of the first upper bridge tube Q51 / Q53 / Q55 is used for connecting the positive pole of the power battery 6, the second end of the first upper bridge tube Q51 / Q53 / Q55 is connected with the first end of the first lower bridge tube Q52 / Q54 / Q56, and the second end of the first lower bridge tube Q52 / Q54 / Q56 is used for connecting the negative pole of the power battery 6. The connection node between the second end of each first upper bridge tube Q51 / Q53 / Q55 and the first end of the first lower bridge tube Q52 / Q54 / Q56 is the middle point of the first bridge arm; the middle points of the at least two first bridge arms are connected with the voltage conversion circuit 1 and the motor winding 4.

[0069] In this example, in the process of needing to control the alternating power supply 7 to charge the power battery 6, the two ends of at least two of the first bridge arms need to be controlled to be connected with the power battery 6, so that the two first bridge arms form a rectification circuit to rectify the alternating current output by the voltage conversion circuit 1; in the process of needing to control the power battery 6 to drive the motor winding 4 to work, all the first bridge arms connected with the motor winding 4 in the at least two first bridge arms need to be controlled to work, so that all the first bridge arms form an inversion circuit to invert the direct current output by the power battery 6 to drive the motor winding 4 to work.

[0070] In an embodiment, the voltage conversion circuit 1 comprises a transformer T1.

[0071] The transformer T1 is adapted to be connected with the alternating power supply 7 and connected with the rectification-inversion circuit 5.

[0072] The transformer T1 is a device for realizing voltage conversion.

[0073] As an example, two input terminals of the transformer T1 are connected with the alternating current power supply 7, two output terminals of the transformer T1 are connected with the rectification and inversion circuit 5, and two connection terminals of the rectification and inversion circuit 5 are connected with the power battery 6, so that the control driving conversion circuit works, and the alternating current power supply 7 can charge the power battery 6. The specific control process is as follows: the alternating current output by the alternating current power supply 7 is subjected to the boosting processing of the transformer T1 and the rectification processing of the rectification and inversion circuit 5, so as to convert the low-voltage alternating current into stable high-voltage direct current, and then the high-voltage direct current is input to the power battery 6, so as to charge the power battery 6.

[0074] In an embodiment, the driving conversion circuit further comprises an isolation circuit 8.

[0075] The isolation circuit 8 is adapted to be connected with the alternating current power supply 7 and connected with the transformer T1.

[0076] As an example, two input terminals of the isolation circuit 8 are connected with the alternating current power supply 7, and two output terminals of the isolation circuit 8 are connected with the transformer T1, so as to perform signal isolation on the alternating current output by the alternating current power supply 7, so as to prevent the interference signal from affecting the normal work of the transformer T1 and the subsequent circuit.

[0077] In an embodiment, the isolation circuit 8 comprises a PFC circuit 81 and a first inversion circuit 82.

[0078] The input terminal of the PFC circuit 81 is adapted to be connected with the alternating current power supply 7, and the output terminal of the PFC circuit 81 is connected with the transformer T1 through the first inversion circuit 82.

[0079] The PFC circuit 81 (Power Factor Correction Circuit) refers to a power factor correction circuit, which is an important element used in electronic equipment, and can improve the power factor of the alternating current power supply 7 and improve the energy efficiency. The first inversion circuit 82 is a circuit for realizing inversion processing.

[0080] As an example, the driving conversion circuit further comprises the PFC circuit 81 and the first inversion circuit 82; the PFC circuit 81 is arranged between the alternating current power supply 7 and the first inversion circuit 82, and the PFC circuit 81 can improve the power factor by correcting the phase difference of the current waveform to keep it consistent with the voltage waveform, thereby improving the utilization efficiency of electric energy. In this example, the PFC circuit 81 can convert the alternating current output by the alternating current power supply 7 into direct current and then output to the first inversion circuit 82, so that the first inversion circuit 82 can perform inversion processing to convert the direct current into alternating current and output to the transformer T1, so that the transformer T1 performs voltage conversion. Understandably, the isolation circuit 8 converts alternating current into direct current through the PFC circuit 81, and converts direct current into alternating current through the first inversion circuit 82, so as to achieve the purpose of signal isolation.

[0081] In an embodiment, as shown in FIG. 3, the transformer T1 comprises a stator assembly, the stator assembly comprising a magnetic core, a first winding 11 and a second winding 12 disposed on the magnetic core; the first winding 11 is connected with the output end of the first inverter circuit 82; the second winding 12 is connected with the rectifier inverter circuit 5.

[0082] In the formula, the first winding 11 and the second winding 12 are two windings of the transformer T1, which are a primary winding and a secondary winding respectively.

[0083] As an example, the transformer T1 comprises a rotor assembly and a stator assembly cooperating with the rotor assembly, the stator assembly comprising a magnetic core, a first winding 11 and a second winding 12 disposed on the magnetic core, two ends of the first winding 11 being connected with the alternating current power supply 7 respectively, specifically through the isolation circuit 8, when the isolation circuit 8 comprises the PFC circuit 81 and the first inverter circuit 82, the two ends of the first winding 11 are connected with two output ends of the first inverter circuit 82 respectively, two ends of the second winding 12 are connected with two connection ends of the rectifier inverter circuit 5 respectively, and the other two connection ends of the rectifier inverter circuit 5 are also adapted to be connected with the power battery 6, the first inverter circuit 82 can perform inverter processing on the direct current output by the PFC circuit 81, convert it into alternating current and output to the first winding 11, so as to form an induced magnetic field between the first winding 11 and the second winding 12, and realize the function of voltage conversion through the magnetic field between the first winding 11 and the second winding 12.

[0084] The second winding 12 of the transformer T1 in the example can be independently provided with the motor winding 4, that is, the second winding 12 of the transformer T1 can be connected with the power battery 6 through the rectifier inverter circuit 5, and the motor winding 4 can also be connected with the power battery 6 through the rectifier inverter circuit 5,

[0085] In an embodiment, as shown in FIG. 3, the second winding 12 is the motor winding 4, and the first winding 11 is also adapted to be connected with the power battery 6.

[0086] As an example, the second winding 12 can be the motor winding 4, so that the magnetic core and the motor winding 4 are reused between the transformer T1 and the motor winding 4, which can meet the purposes of high integration, light weight and low cost; when the second winding 12 is the motor winding 4, the first winding 11 of the transformer T1 is also adapted to be connected with the power battery 6, so that a first induced magnetic field is formed between the power battery 6 and the first winding 11, and a second induced magnetic field is formed around the motor winding 4, which cooperates with the first induced magnetic field to drive the motor winding 4 to work.

[0087] As an example, when the first inverter circuit 82 is not connected with the alternating current power supply 7, and the two connection ends of the first winding 11 and the two connection ends of the rectifier inverter circuit 5 are connected with the power battery 6, the power battery 6 can control the rotation of the motor winding 4 to complete the driving control function. The specific control process is as follows: as shown in FIG. 5, the direct current output by the power battery 6 flows back to the negative pole of the power battery 6 through the first winding 11, so that the first induced magnetic field is formed around the first winding 11; as shown in FIG. 6, the direct current output by the power battery 6 is converted into alternating current by the rectifier inverter circuit 5, and the alternating current flows back to the negative pole of the power battery 6 through the motor winding 4, so that the second induced magnetic field is formed around the motor winding 4; the first induced magnetic field formed by the first winding 11 and the second induced magnetic field formed by the motor winding 4 interact with each other to drive the motor winding 4 to work.

[0088] In the embodiment, the drive conversion circuit integrates the vehicle-mounted charging circuit and the motor driving circuit. Specifically, the rectifier circuit between the transformer T1 and the power battery 6 and the inverter circuit between the power battery 6 and the motor winding 4 are integrated together to form the rectifier inverter circuit 5. Moreover, the second winding 12 in the transformer T1 and the motor winding 4 in the motor driving circuit are also multiplexed to realize the function combination of electrical elements and the change of circuit structure, reduce the electrical elements and wiring harness, meet the integration requirement, and help to save the cost.

[0089] In an embodiment, the first input end of the first inverter circuit 82 is adapted to be connected with the positive pole of the power battery 6, and the second input end of the first inverter circuit 82 is adapted to be connected with the negative pole of the power battery 6.

[0090] As an example, the first inverter circuit 82 can include two second bridge arms, each of which includes a second upper bridge tube Q11 / Q13 and a second lower bridge tube Q12 / Q14 arranged in series, one end of the two second upper bridge tubes Q11 / Q13 being a first input end of the first inverter circuit 82 for connecting a first end of the alternating current power supply 7, one end of the two second lower bridge tubes Q12 / Q14 being a second input end of the first inverter circuit 82 for connecting a second end of the alternating current power supply 7, and the midpoints of the two second bridge arms being a first output end and a second output end of the first inverter circuit 82 for connecting a first end and a second end of the first winding 11, respectively. In the example, the positive electrode of the power battery 6 is connected to the first input end of the first inverter circuit 82 (i.e., the positive electrode of the power battery 6 is connected to the two second upper bridge tubes Q11 / Q13), and the negative electrode of the power battery 6 is connected to the second input end of the first inverter circuit 82 (i.e., the negative electrode of the power battery 6 is connected to the two second lower bridge tubes Q12 / Q14 of the first inverter circuit 82), as shown in FIG. 5. During the process of controlling the motor winding 4 to rotate by the power battery 6, the direct current output by the power battery 6 needs to flow into the first winding 11 through the second upper bridge tube Q11 / Q13 of any second bridge arm and then return to the power battery 6 through the second lower bridge tube Q12 / Q14 of the other second bridge arm, so as to form a first induced magnetic field around the first winding 11. The first induced magnetic field can cooperate with a second induced magnetic field around the motor winding 4 to drive the motor winding 4 to work. Understandably, the two ends of the power battery 6 are connected to the two input ends of the first inverter circuit 82, and the conduction or turn-off of the second upper bridge tube Q11 / Q13 and the second lower bridge tube Q12 / Q14 in the first inverter circuit 82 can control the formation of a loop between the first winding 11 and the power battery 6, so as to form a first induced magnetic field around the first winding 11 that can control the rotation of the motor winding 4. The process does not need to increase additional electrical elements, so that the overall high-voltage system has the advantages of lightweight, low failure rate, and low cost.

[0091] In an embodiment, a first end of the first winding 11 is adapted to be connected to the positive electrode of the power battery 6 through a first switch K1, and a second end of the first winding 11 is adapted to be connected to the negative electrode of the power battery 6 through a second switch K2.

[0092] In an embodiment, the driving conversion circuit further includes a first switch K1 and a second switch K2, a first end of the first winding 11 is adapted to be connected to the positive electrode of the power battery 6 through the first switch K1, and a second end of the first winding 11 is adapted to be connected to the negative electrode of the power battery 6 through the second switch K2.

[0093] As an example, the two connection ends of the first winding 11 are connected with the two output ends of the first inverter circuit 82 respectively, for example, the first end of the first winding 11 is connected with the first output end of the first inverter circuit 82 (i.e. the midpoint of any second bridge arm), and the second end of the first winding 11 is connected with the second output end of the first inverter circuit 82 (i.e. the midpoint of another second bridge arm), when the positive pole of the power battery 6 is connected with the first end of the first winding 11 through the first switch K1, i.e. the first end of the first switch K1 is connected with the positive pole of the power battery 6, and the second end of the first switch K1 is connected with the connection node between the first output end of the first inverter circuit 82 and the first end of the first winding 11; the negative pole of the power battery 6 is connected with the second end of the first winding 11 through the second switch K2, i.e. the first end of the second switch K2 is connected with the negative pole of the power battery 6, and the second end of the second switch K2 is connected with the connection node between the second output end of the first inverter circuit 82 and the second end of the first winding 11. During the process of rotating the motor winding 4 controlled by the power battery 6, the direct current output by the power battery 6 needs to flow into the first winding 11 through the first switch K1, and the direct current output by the first winding 11 needs to flow back to the negative pole of the power battery 6 through the second switch K2, so as to form a first induced magnetic field around the first winding 11, which can cooperate with a second induced magnetic field around the motor winding 4 to drive the motor winding 4 to work. Understandably, the two ends of the power battery 6 are connected with the two connection ends of the first winding 11 through the first switch K1 and the second switch K2 respectively, and the first winding 11 and the power battery 6 can form a loop by controlling the conduction or turn-off of the first switch K1 and the second switch K2, so as to form a first induced magnetic field around the first winding 11, which can control the rotation of the motor winding 4, so that the whole high-voltage system has the advantages of light weight, low failure rate and low cost.

[0094] In an embodiment, the second winding 12 is the motor winding 4, and the transformer T1 further comprises a rotor assembly provided with a permanent magnet.

[0095] As an example, the second winding 12 can be the motor winding 4, so that the magnetic core and the motor winding 4 between the transformer T1 and the motor winding 4 are multiplexed, which can meet the purposes of high integration, light weight and low cost; when the second winding 12 is the motor winding 4, the rotor assembly is provided with a permanent magnet, and a magnetic field can be formed around the permanent magnet without external power excitation, which can cooperate with a second induced magnetic field formed around the motor winding 4 to drive the motor winding 4 to work.

[0096] As an example, when the first inverter circuit 82 is not connected with the alternating current power supply 7, and the two connection ends of the first winding 11 and the two connection ends of the rectifier inverter circuit 5 are connected with the power battery 6, the power battery 6 can control the rotation of the motor winding 4 to complete the driving control function. The specific control process is as follows: during the operation of the transformer T1, the first induction magnetic field is formed around the permanent magnet; as shown in FIG. 6, the direct current output by the power battery 6 is converted into alternating current by the rectifier inverter circuit 5, and the alternating current flows back to the negative electrode of the power battery 6 through the motor winding 4, so as to form the second induction magnetic field around the motor winding 4; the first induction magnetic field formed by the first winding 11 interacts with the second induction magnetic field formed by the motor winding 4 to drive the motor winding 4 to work.

[0097] In the embodiment, the driving conversion circuit integrates the vehicle charging circuit and the motor driving circuit. Specifically, the rectifier circuit between the transformer T1 and the power battery 6 and the inverter circuit between the power battery 6 and the motor winding 4 are integrated together to form the rectifier inverter circuit 5. Moreover, the second winding 12 in the transformer T1 and the motor winding 4 in the motor driving circuit are reused to realize the function combination of electrical elements and the change of circuit structure, reduce the electrical elements and wiring harness, meet the integration requirement, and help save the cost.

[0098] Compared with the traditional independent design scheme of the vehicle charging circuit and the motor driving circuit, the driving conversion circuit has the following advantages: first, the integrated driving conversion circuit has a compact design structure, can reduce the high-voltage connection wiring harness, combine the connector and the component structure, and reduce the support, so that the integrated system can reduce the volume and the mass while ensuring the performance, realize the lightweight of the whole vehicle, be more suitable for the vehicle layout, and be more helpful for improving the performance of the vehicle. Second, since the transformer T1 of the vehicle charging circuit and the motor winding 4 of the motor driving circuit are integrated in one system, the use of electrical elements, connectors and wiring harness can be reduced, so that the failure rate of the whole system is reduced. Third, the integrated scheme of the transformer T1 of the vehicle charging circuit and the motor winding 4 of the motor driving circuit can effectively reduce the wiring harness loop and branch, and at the same time, the assembly time, the part development period and the electrical equipment structure can be greatly reduced, so that the superior driving experience is brought to the consumers, the assembly of the host factory is simplified, and the cost is saved. Fourth, since the components, connectors and loops are reduced, the volume of the whole system is reduced, the space utilization of the whole vehicle is improved, the transportation capacity of the electric vehicle is increased, and thus the comfort, economy and endurance of the electric vehicle are improved.

[0099] In an embodiment, as shown in FIG. 3 and FIG. 7, the motor winding 4 comprises at least two motor coils L41 / L42 / L43; a first end of each motor coil L41 / L42 / L43 is connected to a midpoint of a first bridge arm, and second ends of the at least two motor coils L41 / L42 / L43 are connected to each other.

[0100] In the embodiment, the motor winding 4 comprises at least two motor coils L41 / L42 / L43, for example, the motor winding 4 is a two-phase motor winding 4, and the motor winding 4 comprises two motor coils L41 / L42; or the motor winding 4 is a three-phase motor winding, and the motor winding 4 comprises three motor coils L41 / L42 / L43.

[0101] As an example, the rectifier-inverter circuit 5 comprises at least two first bridge arms, each first bridge arm comprises a first upper bridge tube Q51 / Q53 / Q55 and a first lower bridge tube Q52 / Q54 / Q56 arranged in series, the at least two first upper bridge tubes Q51 / Q53 / Q55 are used to connect a positive electrode of the power battery 6, the at least two first lower bridge tubes Q52 / Q54 / Q56 are used to connect a negative electrode of the power battery 6, a midpoint of each first bridge arm is used to connect a first end of a motor coil L41 / L42 / L43, and second ends of the at least two motor coils L41 / L42 / L43 are connected to each other. For example, the first upper bridge tube Q51 / Q53 / Q55 and the first lower bridge tube Q52 / Q54 / Q56 are two IGBT tubes of the same type, a first end of the first upper bridge tube Q51 / Q53 / Q55 is used to connect the positive electrode of the power battery 6, a second end of the first upper bridge tube Q51 / Q53 / Q55 is connected to a first end of the first lower bridge tube Q52 / Q54 / Q56, a second end of the first lower bridge tube Q52 / Q54 / Q56 is used to connect the negative electrode of the power battery 6, and a connection node between the second end of each first upper bridge tube Q51 / Q53 / Q55 and the first end of the first lower bridge tube Q52 / Q54 / Q56 is the midpoint of the first bridge arm; in the at least two motor coils L41 / L42 / L43, each motor coil L41 / L42 / L43 is connected to the midpoint of a first bridge arm, and second ends of the at least two motor coils L41 / L42 / L43 are connected to each other.

[0102] When it is needed to control the driving conversion circuit to work so that the AC power 7 charges the power battery 6, the working process of the motor winding 4 and the rectification inversion circuit 5 is as follows: the current output by the first end of the AC power 7 flows back to the second end of the AC power 7 through the first inversion circuit 82 and the first winding 11 in sequence, so that the first winding 11 forms a first induced magnetic field, and the induced current is formed between any two motor coils L41 / L42 / L43, the induced current flows through the first upper bridge tube Q51 / Q53 / Q55 corresponding to one of the motor coils L41 / L42 / L43, the power battery 6 and the first lower bridge tube Q52 / Q54 / Q56 corresponding to the other motor coil L41 / L42 / L43 to form a charging loop, so as to complete the purpose of charging the power battery 6, and at this time, the rectification inversion circuit 5 can play a rectification role. As shown in FIG. 4, the first induced magnetic field can form an induced current between the motor coil L41 and the motor coil L43, and the first upper bridge tube Q51 and the first lower bridge tube Q56 are controlled to be conductive, so that the motor coil L41, the motor coil L43 and the power battery 6 form a charging loop. Understandably, when the motor winding 4 includes N motor coils, it can form a plurality of combinations, each combination can form a charging loop between the motor winding 4, the rectification inversion circuit 5 and the power battery 6, and the corresponding combination can be determined autonomously according to the actual situation.

[0103] When it is needed to control the driving conversion circuit to work so that the power battery 6 controls the motor winding 4 to work, the working process of the motor winding 4 and the rectification inversion circuit 5 is as follows: as shown in FIG. 5, the direct current output by the power battery 6 flows back to the negative electrode of the power battery 6 through the first winding 11 directly or indirectly, so that the first winding 11 forms a first induced magnetic field; as shown in FIG. 6, the direct current output by the power battery 6 is inverted by the rectification inversion circuit 5 to convert into the AC power 7 input into the motor winding 4, so that the motor winding 4 forms a second induced magnetic field, and specifically, the direct current output by the power battery 6 flows into any motor coil L41 through the first upper bridge tube Q51 of any first bridge arm, and then flows into other motor coil L42 / L43 from the second end of the motor coil L41 / L42 / L43, and flows back to the negative electrode of the power battery 6 from the first lower bridge tube Q54 / Q56 corresponding to the other motor coil L42 / L43, so that the motor winding 4 forms a second induced magnetic field; the first induced magnetic field formed by the first winding 11 and the second induced magnetic field formed by the motor winding 4 interact to form a driving loop to drive the motor winding 4 to work, and at this time, the rectification inversion circuit 5 plays an inversion role. In this example, the first upper bridge tube Q51 / Q53 / Q55 needed to be conductive and the corresponding first lower bridge tube Q52 / Q54 / Q56 can be selected autonomously according to actual needs.

[0104] In this embodiment, at least two first bridge arms are used in cooperation with at least two motor coils L41 / L42 / L43, so that the rectifier inverter circuit 5 formed thereby can realize rectification effect by using any two first bridge arms and the corresponding motor coils L41 / L42 / L43, and can realize inverter effect based on all first bridge arms and the corresponding motor coils L41 / L42 / L43, which helps to reduce electrical elements, so that the rectifier inverter circuit 5 as a whole has the advantages of lightweight, low failure rate and low cost.

[0105] In an embodiment, as shown in FIGS. 3 and 7, the first inverter circuit 82 includes two second bridge arms, each of which includes a second upper bridge tube Q11 / Q13 and a second lower bridge tube Q12 / Q14 arranged in series, and the connection node between the second upper bridge tube Q11 / Q13 and the second lower bridge tube Q12 / Q14 is the midpoint of the second bridge arm; one end of the two second upper bridge tubes Q11 / Q13 is used to connect the first end of the alternating current power supply 7; one end of the two second lower bridge tubes Q12 / Q14 is used to connect the second end of the alternating current power supply 7; and the midpoints of the two second bridge arms are respectively connected to the two input ends of the first winding 11.

[0106] Among them, the second upper bridge tube Q11 / Q13 is a switch tube for connecting the first end of the alternating current power supply 7, and the second lower bridge tube Q12 / Q14 is a switch tube for connecting the second end of the alternating current power supply 7. The second upper bridge tube Q11 / Q13 and the second lower bridge tube Q12 / Q14 here can be, but are not limited to, IGBT tubes.

[0107] As an example, the first inverter circuit 82 includes two second bridge arms, each of which includes a second upper bridge tube Q11 / Q13 and a second lower bridge tube Q12 / Q14 arranged in series, one end of the two second upper bridge tubes Q11 / Q13 being a first input end of the first inverter circuit 82, for connecting a first end of the alternating current power supply 7; one end of the two second lower bridge tubes Q12 / Q14 being a second input end of the first inverter circuit 82, for connecting a second end of the alternating current power supply 7, the midpoints of the two second bridge arms being a first output end and a second output end of the first inverter circuit 82, respectively, and being connected to two input ends of the first winding 11, and being specifically used for connecting a first end and a second end of the first winding 11. For example, when the second upper bridge tube Q11 / Q13 and the second lower bridge tube Q12 / Q14 are two IGBT tubes of the same type, the first end of the second upper bridge tube Q11 / Q13 is used for connecting the first end of the alternating current power supply 7, the second end of the second upper bridge tube Q11 / Q13 is connected to the first end of the second lower bridge tube Q12 / Q14, the second end of the second lower bridge tube Q12 / Q14 is used for connecting the second end of the alternating current power supply 7, and the connection node between the second end of the second upper bridge tube Q11 / Q13 and the first end of the second lower bridge tube Q12 / Q14 is the midpoint of the second bridge arm; among the two second bridge arms, the midpoint of one second bridge arm is used for connecting the first end of the first winding 11, and the midpoint of the other second bridge arm is used for connecting the second end of the first winding 11. As shown in FIGS. 4 and 5, during the operation of the first inverter circuit 82, the current output from the first end of the alternating current power supply 7 or the positive electrode of the power battery 6 can flow into the first winding 11 through the second upper bridge tube Q11 of one second bridge arm, and the current output from the first winding 11 can flow back to the second end of the alternating current power supply 7 through the second lower bridge tube Q14 of the other second bridge arm, so as to form a loop, so that a first induced magnetic field is formed around the first winding 11, and the first induced magnetic field cooperates with a second induced magnetic field formed around the motor winding 4 to complete the charging function or the driving function. Understandably, the second upper bridge tube Q13 and the second lower bridge tube Q12 are also controlled to be turned on, and the same effect as that of turning on the second upper bridge tube Q11 and the second lower bridge tube Q14 can be achieved. In the example, the first inverter circuit 82 has the advantages of simple overall structure, small number of required electrical elements, lightweight structure, and low cost.

[0108] In an embodiment, the drive conversion circuit further includes a resonance circuit arranged between the output end of the first inverter circuit 82 and the input end of the first winding 11.

[0109] As an example, the drive conversion circuit further includes a resonance circuit arranged between the output end of the first inverter circuit 82 and the input end of the first winding 11, and the resonance circuit is used for performing resonance processing on the signal output from the first inverter circuit 82, so as to reduce signal fluctuation and guarantee constant output of the signal.

[0110] In an embodiment, the resonant circuit comprises a resonant inductor L1.

[0111] As an example, the resonant circuit can comprise, but is not limited to, a resonant inductor L1 arranged between the output of the first inverter circuit 82 and the input of the first winding 11, for adjusting the resonant frequency of the circuit, so that the current and voltage in the circuit are smooth, reducing signal fluctuations, thereby ensuring constant output of the signal.

[0112] In an embodiment, the drive conversion circuit further comprises a DC blocking capacitor C1 arranged between the output of the first inverter circuit 82 and the input of the first winding 11.

[0113] As an example, the drive conversion circuit further comprises a DC blocking capacitor C1 arranged between the output of the first inverter circuit 82 and the input of the first winding 11, which utilizes the DC blocking and alternating current passing characteristics of the DC blocking capacitor C1 to stabilize the voltage and smooth the waveform.

[0114] The embodiment of the present application provides a high-voltage system, comprising a power battery 6 and the drive conversion circuit of the above-mentioned embodiment; the two ends of the power battery 6 are connected with the rectifier-inverter circuit 5.

[0115] As an example, when the voltage conversion circuit 1 is connected with the alternating current power supply 7, the two connection ends of the rectifier-inverter circuit 5 are connected with the two ends of the power battery 6, the drive conversion circuit is controlled to work, so that the alternating current power supply 7 charges the power battery 6, and the specific control process is as follows: as shown in FIG. 4, the alternating current voltage output by the alternating current power supply 7 is processed by the voltage conversion circuit 1 and the rectifier-inverter circuit 5, so as to convert the low-voltage alternating current into stable high-voltage direct current, and then input the high-voltage direct current into the power battery 6, so as to charge the power battery 6.

[0116] As an example, when the voltage conversion circuit 1 is not connected with the alternating current power supply 7, the two connection ends of the first winding 11 and the two connection ends of the rectifier-inverter circuit 5 are connected with the two ends of the power battery 6, so as to realize the function of driving and controlling the motor winding 4 to rotate by the power battery 6, and the specific control process is as follows: as shown in FIG. 5, the direct current output by the power battery 6 flows back to the negative electrode of the power battery 6 through the first winding 11, so that the first induction magnetic field is formed around the first winding 11, or the magnetic field is formed by the permanent magnet on the rotor assembly; as shown in FIG. 6, the direct current output by the power battery 6 is converted into alternating current by the rectifier-inverter circuit 5, the alternating current flows back to the negative electrode of the power battery 6 through the motor winding 4, so as to form the second induction magnetic field around the motor winding 4; the first induction magnetic field formed by the first winding 11 or the magnetic field formed by the permanent magnet interacts with the second induction magnetic field formed by the motor winding 4, so as to drive the motor winding 4 to work.

[0117] In the embodiment, the drive conversion circuit adopts an integrated scheme of the on-board charging circuit and the motor drive circuit, integrates the rectifier circuit between the transformer T1 and the power battery 6 and the inverter circuit between the power battery 6 and the motor winding 4 together to form the rectifier-inverter circuit 5, realizes the function combination of the electrical elements and the change of the circuit structure, reduces the electrical elements and the wiring harness, meets the integration requirement, and helps to save the cost.

[0118] Compared with the traditional independent design scheme of the on-board charging circuit and the motor drive circuit, the following advantages are obtained: first, the integrated drive conversion circuit has a compact design structure, can reduce the high-voltage connection wiring harness, combine the connector and the component structure, and reduce the support, the integrated system can reduce the volume and the mass while ensuring the performance, realizes the lightweight of the whole vehicle, is more suitable for the vehicle layout, and is more helpful to improve the performance of the vehicle. Second, the transformer T1 of the on-board charging circuit and the motor winding 4 in the motor drive circuit are integrated in one system, the use of the electrical elements, the connector and the wiring harness can be reduced, so that the failure rate of the whole system is reduced. Third, the integrated scheme of the transformer T1 of the on-board charging circuit and the motor winding 4 in the motor drive circuit can effectively reduce the wiring harness loop and branch, at the same time, the assembly time, the part development period and the electrical equipment structure can be greatly reduced, while bringing more superior driving experience to the consumer, the assembly of the host factory is also simplified, and the cost is saved. Fourth, due to the reduction of the components, the connector and the loop, the volume of the whole system is reduced, the space utilization of the whole vehicle is improved, the transportation capacity of the electric vehicle is increased, and the comfort, the economy and the endurance of the electric vehicle are improved.

[0119] Further, when the direct-current blocking capacitor C1 is arranged between the output end of the first inverter circuit 82 and the input end of the first winding 11, the second end of the first switch K1 can be arranged between the direct-current blocking capacitor C1 and the first end of the first winding 11, so as to avoid the direct-current blocking and alternating-current passing characteristic of the direct-current blocking capacitor C1, and the alternating current output by the positive electrode of the power battery 6 cannot flow back to the negative electrode of the power battery 6.

[0120] The embodiment of the application provides a vehicle, which comprises the high-voltage system in the above embodiment.

[0121] As an example, the vehicle comprises the high-voltage system in the above embodiment, and the high-voltage system comprises the drive conversion circuit in the above embodiment and the power battery 6 connected to the drive conversion circuit. The drive conversion circuit adopts an integrated scheme of the on-board charging circuit and the motor drive circuit, realizes the function combination of the electrical elements and the change of the circuit structure, reduces the electrical elements and the wiring harness, meets the integration requirement, and helps to save the cost.

[0122] The above examples are only used to illustrate the technical solutions of the present application, but not limit the same; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that the technical solutions recorded in the foregoing examples can be modified, or some technical features can be replaced by equivalent ones; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application.

Claims

1. A drive conversion circuit, wherein, The motor drive circuit comprises the rectifier-inverter circuit (5) and a motor winding (4); The motor drive circuit comprises the rectifier-inverter circuit (5) and a motor winding (4); The rectifier-inverter circuit (5) is connected with the voltage conversion circuit (1) and the motor winding (4), and is adapted to be connected with a power battery (6) for rectifying alternating current output by the voltage conversion circuit (1) to output direct current to the power battery (6), or inverting direct current output by the power battery (6) to output alternating current to the motor winding (4). The rectifier-inverter circuit (5) comprises at least two first bridge arms, each of which comprises a first upper bridge tube and a first lower bridge tube arranged in series, and a connection node between the first upper bridge tube and the first lower bridge tube is a midpoint of the first bridge arm; 2. The drive conversion circuit according to claim 1, wherein At least two first upper bridge tubes are used for connecting a positive electrode of the power battery (6); At least two first lower bridge tubes are used for connecting a negative electrode of the power battery (6); The midpoints of the at least two first bridge arms are connected with the voltage conversion circuit (1) and the motor winding (4). The voltage conversion circuit comprises a transformer (T1); 3. The drive conversion circuit according to claim 2, wherein The transformer (82) is adapted to be connected with an alternating current power supply (7) and connected with the rectifier-inverter circuit (5). The drive conversion circuit further comprises an isolation circuit (8); 4. The drive conversion circuit according to claim 3, characterized by The isolation circuit (8) is adapted to be connected with the alternating current power supply (7) and connected with the transformer (T1). The isolation circuit (8) comprises a PFC circuit (81) and a first inverter circuit (82); 5. The drive conversion circuit according to claim 4, wherein An input end of the PFC circuit (81) is adapted to be connected with the alternating current power supply (7), and an output end of the PFC circuit (81) is connected with the transformer (82) through the first inverter circuit (82). The transformer (T1) comprises a stator assembly, the stator assembly comprises a magnetic core, a first winding (11) and a second winding (12) arranged on the magnetic core; the first winding (11) is connected with an output end of the first inverter circuit (82); and the second winding (12) is connected with the rectifier-inverter circuit (5).

6. The drive conversion circuit according to claim 5, wherein The second winding (12) is the motor winding (4), and the first winding (11) is further adapted to be connected with the power battery (6).

7. The drive conversion circuit according to claim 6, wherein A first input end of the first inverter circuit (82) is adapted to be connected with a positive electrode of the power battery (6), and a second input end of the first inverter circuit (82) is adapted to be connected with a negative electrode of the power battery (6).

8. The drive conversion circuit according to claim 7, wherein A first end of the first winding (11) is adapted to be connected with the positive electrode of the power battery (6) through a first switch (K1); and a second end of the first winding (11) is adapted to be connected with the negative electrode of the power battery (6) through a second switch (K2).

9. The drive conversion circuit according to claim 7, wherein The second winding (12) is the motor winding (4); 10. The drive conversion circuit according to claim 6, wherein The transformer (T1) further comprises a rotor assembly, and a permanent magnet is arranged in the rotor assembly. ​ 11. The drive conversion circuit according to any one of claims 6 to 9, wherein The motor winding (4) comprises at least two motor coils; The first end of each motor coil is connected to the midpoint of a first bridge arm, and the second ends of the at least two motor coils are connected to each other.

12. The drive conversion circuit according to any one of claims 6-9, wherein, The first inverter circuit (82) comprises two second bridge arms, each of which comprises a second upper bridge tube and a second lower bridge tube arranged in series, and the connection node between the second upper bridge tube and the second lower bridge tube is the midpoint of the second bridge arm; One end of the two second upper bridge tubes is used for connecting the first end of the alternating current power supply (7); One end of the two second lower bridge tubes is used for connecting the second end of the alternating current power supply (7); The midpoints of the two second bridge arms are respectively connected to the two input ends of the first winding (11).

13. The drive conversion circuit according to any one of claims 6-9, wherein, The drive conversion circuit further comprises a resonance circuit arranged between the output end of the first inverter circuit (82) and the input end of the first winding (11).

14. The drive conversion circuit according to claim 13, wherein, The resonance circuit comprises a resonance inductor (L1).

15. The drive conversion circuit according to any one of claims 6-9, wherein, The drive conversion circuit further comprises a DC blocking capacitor (C1) arranged between the output end of the first inverter circuit (82) and the input end of the first winding (11).

16. A high voltage system, wherein, The drive conversion circuit comprises a power battery (6) and the drive conversion circuit according to any one of claims 1-15. The two ends of the power battery (6) are connected to the rectifier-inverter circuit (5).

17. An automobile characterized by comprising: The high-voltage system comprises the high-voltage system according to claim 16.

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