Drive conversion circuits, high voltage systems and automobiles

Abstract

The present invention discloses a drive conversion circuit, a high voltage system and a car. The drive conversion circuit includes an on-board charging circuit and a motor drive circuit; the on-board charging circuit includes a voltage conversion circuit and a rectifier inverter circuit, and the voltage conversion circuit is suitable for connecting to an AC power supply; the motor drive circuit includes the rectifier inverter circuit and a motor winding; the rectifier inverter circuit connects the voltage conversion circuit and the motor winding, and the rectifier inverter circuit is suitable for connecting to a power battery, and is used to rectify the AC power output by the voltage conversion circuit and output DC power to the power battery, or to invert the DC power output by the power battery and output AC power to the motor winding. The drive conversion circuit reduces electrical components and wiring harnesses by combining the functions of electrical components and changing the circuit structure, so as to meet the integration requirements and help save costs.

Description

Technical Field

[0001] The present invention relates to the technical field of electric vehicles, and in particular to a drive conversion circuit, a high voltage system and an automobile. Background Art

[0002] The high-voltage system is the core system of electric vehicles, which generally includes power batteries, on-board charging circuits and motor drive circuits. Existing on-board charging circuits and motor drive circuits are generally set up independently with a low degree of integration, resulting in the high-voltage system being large in size, heavy in weight and high in cost.

[0003] like Figure 1 As shown, the vehicle 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 to the AC power supply, and the output end of the voltage conversion circuit is connected to the power battery through the rectifier circuit. Its working process is as follows: the AC power output by the AC power supply is converted by the voltage conversion circuit and rectified by the rectifier circuit in sequence to convert the low-voltage AC power into a stable high-voltage DC power to charge the power battery. The motor drive circuit includes an inverter circuit and a motor winding. The input end of the inverter circuit is used to connect to the power battery, and the output end of the inverter circuit is used to connect to the motor winding. Its working process is as follows: the DC power output by the power battery is converted by the inverter circuit to form AC power, which drives the motor winding to rotate, thereby making the car run. This method of independently setting the vehicle charging circuit and the motor drive circuit has a low degree of integration, and the overall problem of large size, heavy weight and high cost. Summary of the invention

[0004] The embodiments of the present invention provide a driving conversion circuit, a high voltage system and a car to solve the problem of low integration level of the existing high voltage system.

[0005] A drive conversion circuit includes an on-vehicle charging circuit and a motor drive circuit;

[0006] The vehicle-mounted charging circuit includes a voltage conversion circuit and a rectifier inverter circuit, and the voltage conversion circuit is suitable for connecting to an AC power supply;

[0007] The motor drive circuit includes the rectifier inverter circuit and the motor winding;

[0008] The rectifier-inverter circuit is connected to the voltage conversion circuit and the motor winding. The rectifier-inverter circuit is suitable for connecting to a power battery, and is used to rectify the alternating current output by the voltage conversion circuit and output direct current to the power battery, or to invert the direct current output by the power battery and output alternating current to the motor winding.

[0009] Preferably, the rectifier inverter circuit comprises at least two first bridge arms, each of the first bridge arms comprises a first upper bridge tube and a first lower bridge tube connected 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;

[0010] At least two of the first upper bridge tubes are used to connect the positive electrode of the power battery;

[0011] At least two of the first lower bridge tubes are used to connect the negative electrode of the power battery;

[0012] Midpoints of at least two of the first bridge arms are connected to the voltage conversion circuit and the motor winding.

[0013] Preferably, the voltage conversion circuit comprises a transformer;

[0014] The transformer is suitable for connecting to an AC power source and is connected to the rectifier inverter circuit.

[0015] Preferably, the drive conversion circuit further includes an isolation circuit;

[0016] The isolation circuit is suitable for connecting to the AC power source and connected to the transformer.

[0017] Preferably, the isolation circuit includes a PFC circuit and a first inverter circuit;

[0018] The input end of the PFC circuit is suitable for connecting to an AC power source, and the output end of the PFC circuit is connected to the transformer through the first inverter circuit.

[0019] Preferably, the transformer includes a stator assembly, the stator assembly includes a magnetic core, a first winding and a second winding arranged on the magnetic core; the first winding is connected to the output end of the first inverter circuit; the second winding is connected to the rectifier inverter circuit.

[0020] Preferably, the second winding is the motor winding, and the first winding is also suitable for connecting to a power battery.

[0021] Preferably, the first input end of the first inverter circuit is suitable for being connected to the positive electrode of the power battery, and the second input end of the first inverter circuit is suitable for being connected to the negative electrode of the power battery.

[0022] Preferably, the first end of the first winding is suitable for being connected to the positive electrode of the power battery through a first switch; and the second end of the first winding is suitable for being connected to the negative electrode of the power battery through a second switch.

[0023] Preferably, the second winding is the motor winding;

[0024] The transformer further comprises a rotor assembly in which a permanent magnet is arranged.

[0025] Preferably, the motor winding comprises at least two motor coils;

[0026] The first end of each of the motor coils is connected to a midpoint of the first bridge arm, and the second ends of at least two of the motor coils are connected to each other.

[0027] Preferably, the first inverter circuit comprises two second bridge arms, each of the second bridge arms comprises a second upper bridge tube and a second lower bridge tube arranged in series, and a connection node between the second upper bridge tube and the second lower bridge tube is a midpoint of the second bridge arm;

[0028] One end of the two second upper bridge tubes is used to connect to the first end of the AC power supply;

[0029] One end of the two second lower bridge tubes is used to connect to the second end of the AC power supply;

[0030] The midpoints of the two second bridge arms are respectively connected to the two input ends of the first winding.

[0031] Preferably, the drive conversion circuit further includes a resonant circuit, and the resonant circuit is arranged between the output end of the first inverter circuit and the input end of the first winding.

[0032] Preferably, the resonant circuit comprises a resonant inductor.

[0033] Preferably, the drive conversion circuit further includes 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.

[0034] A high voltage system, comprising a power battery and the above-mentioned drive conversion circuit;

[0035] The two ends of the power battery are connected to the rectifier inverter circuit.

[0036] An automobile comprises the above-mentioned high-voltage system.

[0037] The above-mentioned drive conversion circuit, high-voltage system and automobile adopt an integration solution of the on-board charging circuit and the motor drive circuit, specifically integrating the rectifier circuit between the transformer and the power battery and the inverter circuit between the power battery and the motor winding to form a rectifier inverter circuit, realizing the functional merger of electrical components and the change of circuit structure, reducing electrical components and wiring harnesses to meet integration requirements, and helping to save costs, reduce weight and volume. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative labor.

[0039] Figure 1 It is a circuit diagram of a high voltage system in the prior art;

[0040] Figure 2 is a schematic diagram of a high voltage system in one embodiment of the present invention;

[0041] Figure 3 is a circuit diagram of a high voltage system in one embodiment of the present invention;

[0042] Figure 4 yes Figure 3 A timing diagram of the high voltage system in realizing the charging function;

[0043] Figure 5 yes Figure 3 A timing diagram of the high voltage system in realizing the driving function;

[0044] Figure 6 yes Figure 3 Another timing diagram of the high voltage system realizing the driving function.

[0045] Figure 7 is another circuit diagram of a high voltage system in one embodiment of the present invention.

[0046] In the figure: 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. AC power supply; 8. isolation circuit; 81. FPC circuit; 82. first inverter circuit. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] It should be understood that the present invention can be implemented in different forms and should not be construed as being limited to the embodiments set forth herein. On the contrary, providing these embodiments will make the disclosure thorough and complete and fully convey the scope of the present invention to those skilled in the art. In the accompanying drawings, the sizes and relative sizes of layers and regions may be exaggerated for clarity. The same reference numerals throughout represent the same elements.

[0049] It should be understood that when an element or layer is referred to as being "on, adjacent to, connected to or coupled to other elements or layers, it may be directly on, adjacent to, connected to or coupled to other elements or layers, or there may be intervening elements or layers. In contrast, when an element is referred to as being "directly on, directly adjacent to, directly connected to or directly coupled to other elements or layers, there may be no intervening elements or layers. It should be understood that, although the terms first, second, third, etc. may be used to describe various elements, components, regions, layers and / or parts, these elements, components, regions, layers and / or parts should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or part from another element, component, region, layer or part. Therefore, without departing from the teachings of the present invention, the first element, component, region, layer or part discussed below may be represented as a second element, component, region, layer or part.

[0050] Spatially relative terms such as "under," "beneath," "below," "under," "above," "above," and the like may be used herein for ease of description to describe the relationship of an element or feature shown in the figures to other elements or features. It should be understood that the spatially relative terms are intended to include different orientations of the device in use and operation in addition to the orientations shown in the figures. For example, if the device in the accompanying drawings is flipped, then the elements or features described as "under other elements" or "under" or "under" will be oriented as "above" the other elements or features. Thus, the exemplary terms "under" and "under" may include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or other orientations) and the spatial descriptors used herein are interpreted accordingly.

[0051] The purpose of the terms used herein is only to describe specific embodiments and is not intended to be limiting of the present invention. When used herein, the singular forms "one", "an" and "said / the" are also intended to include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "consisting of" and / or "comprising", when used in this specification, determine the presence of the features, integers, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, parts and / or groups. When used herein, the term "and / or" includes any and all combinations of the relevant listed items.

[0052] In order to fully understand the present invention, detailed structures and steps will be presented in the following description to illustrate the technical solutions proposed by the present invention. The preferred embodiments of the present invention are described in detail below, but in addition to these detailed descriptions, the present invention may also have other implementations.

[0053] An embodiment of the present invention provides a driving conversion circuit, such as Figure 1 and Figure 2 As shown, it includes an on-board charging circuit and a motor driving circuit;

[0054] The vehicle-mounted charging circuit comprises a voltage conversion circuit 1 and a rectifier inverter circuit 5, wherein the voltage conversion circuit 1 is suitable for connecting to an AC power source 7;

[0055] The motor drive circuit includes the rectifier inverter circuit 5 and the motor winding 4;

[0056] The rectifier inverter circuit 5 is connected to the voltage conversion circuit 1 and the motor winding 4. The rectifier inverter circuit 5 is suitable for connecting to a power battery 6, and is used to rectify the alternating current output by the voltage conversion circuit 1 and output direct current to the power battery 6, or to invert the direct current output by the power battery 6 and output alternating current to the motor winding 4.

[0057] Among them, the on-board charging circuit is a circuit for charging the vehicle. The motor drive circuit is a circuit for realizing motor drive control. The voltage conversion circuit 1 is a circuit for realizing voltage conversion. The rectifier inverter circuit 5 is a circuit that can realize both inverter processing and rectifier processing. It is a circuit that reuses components of the rectifier circuit and the inverter circuit. It can realize two functions and help reduce the number of components in the circuit to meet the purpose of high integration, light weight and low cost.

[0058] As an example, when the voltage conversion circuit 1 is connected to the AC power supply 7 and the two connection ends of the rectifier inverter circuit 5 are connected to the power battery 6, the control drive conversion circuit is operated so that the AC power supply 7 can charge the power battery 6. The specific control process is as follows: the AC power voltage conversion circuit 1 performs a boost process on the AC power supply 7 output and the rectifier inverter circuit 5 performs a rectification process to convert the low-voltage AC power into a stable high-voltage DC power, and then the high-voltage DC power is input into the power battery 6 to charge the power battery 6.

[0059] As an example, when the motor winding 4 is connected to the power battery 6 through the rectifier inverter circuit 5, the power battery 6 can control the rotation of the motor winding 4 to complete the drive control function. The specific control process is as follows: the DC power output by the power battery 6 is rectified by the rectifier inverter circuit 5 to convert the DC power output by the power battery 6 into AC power, which is output to the motor winding 4 to drive the motor winding 4 to work.

[0060] In this embodiment, the drive conversion circuit integrates the vehicle-mounted charging circuit and the motor drive circuit, specifically integrating 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 to form a rectifier inverter circuit 5, so as to realize the functional merger of electrical components and the change of circuit structure, reduce electrical components and wiring harnesses to meet the integration requirements, and help save costs, reduce weight and volume.

[0061] In one embodiment, if Figure 3 As shown, the rectifier inverter circuit 5 includes at least two first bridge arms, each of which includes a first upper bridge tube Q51 / Q53 / Q55 and a first lower bridge tube Q52 / Q54 / Q56 connected in series, and the connection node between the first upper bridge tube Q51 / Q53 / Q55 and the first lower bridge tube Q52 / Q54 / Q56 is the midpoint of the first bridge arm;

[0062] At least two of the first upper bridge tubes Q51 / Q53 / Q55 are used to connect the positive electrode of the power battery 6;

[0063] At least two of the first lower bridge tubes Q52 / Q54 / Q56 are used to connect the negative electrode of the power battery 6;

[0064] Midpoints of at least two of the first bridge arms are connected to the voltage conversion circuit 1 and the motor winding 4 .

[0065] Among them, the first upper bridge tube Q51 / Q53 / Q55 is a switching tube for connecting the positive electrode of the power battery 6, the first upper bridge tube Q51 / Q53 / Q55 is a switching 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 IGTB tubes.

[0066] As an example, the rectifier inverter circuit 5 includes at least two first bridge arms, each first bridge arm includes a first upper bridge tube Q51 / Q53 / Q55 and a first lower bridge tube Q52 / Q54 / Q56 arranged in series, at least two first upper bridge tubes Q51 / Q53 / Q55 are used to connect the positive electrode of the power battery 6, at least two first lower bridge tubes Q52 / Q54 / Q56 are used to connect the negative electrode of the power battery 6, and the midpoints of at least two first bridge arms are connected to 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 model, the first end of the first upper bridge tube Q51 / Q53 / Q55 is used to connect the positive electrode of the power battery 6, the second end of the first upper bridge tube Q51 / Q53 / Q55 is connected to 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 to connect the negative electrode of the power battery 6, and 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 midpoint of the first bridge arm; the midpoints of at least two first bridge arms are connected to the voltage conversion circuit 1 and the motor winding 4.

[0067] In this example, when it is necessary to control the AC power supply 7 to charge the power battery 6, it is necessary to control the two ends of two first bridge arms of at least two first bridge arms and the power battery 6, so that the two first bridge arms form a rectifier circuit to rectify the AC power output by the voltage conversion circuit 1; when it is necessary to control the power battery 6 to drive the motor winding 4 to work, it is necessary to control all the first bridge arms of at least two first bridge arms connected to the motor winding 4 to work, so that all the first bridge arms form an inverter circuit to invert the DC power output by the power battery 6 to drive the motor winding 4 to work.

[0068] In one embodiment, the voltage conversion circuit 1 includes a transformer T1;

[0069] The transformer T1 is suitable for connecting to an AC power source 7 and is connected to the rectifier inverter circuit 5 .

[0070] Among them, transformer T1 is a device for realizing voltage conversion.

[0071] As an example, the two input ends of the transformer T1 are connected to the AC power source 7, and the two output ends of the transformer T1 are connected to the rectifier inverter circuit 5. When the two connection ends of the rectifier inverter circuit 5 are connected to the power battery 6, the control drive conversion circuit works, so that the AC power source 7 can charge the power battery 6. The specific control process is as follows: the AC power output by the AC power source 7 is boosted by the transformer T1 and rectified by the rectifier inverter circuit 5 to convert the low-voltage AC power into stable high-voltage DC power, and then the high-voltage DC power is input into the power battery 6 to charge the power battery 6.

[0072] In one embodiment, the drive conversion circuit further includes an isolation circuit 8;

[0073] The isolation circuit 8 is suitable for being connected to the AC power source 7 and connected to the transformer T1 .

[0074] As an example, the two input ends of the isolation circuit 8 are connected to the AC power supply 7, and the two output ends of the isolation circuit 8 are connected to the transformer T1, which is used to isolate the AC power output by the AC power supply 7 to prevent interference signals from affecting the normal operation of the transformer T1 and its subsequent circuits.

[0075] In one embodiment, the isolation circuit 8 includes a PFC circuit 81 and a first inverter circuit 82;

[0076] The input end of the PFC circuit 81 is suitable for connecting to the AC power source 7 , and the output end of the PFC circuit 81 is connected to the transformer T1 through the first inverter circuit 82 .

[0077] The PFC circuit 81 (Power Factor Correction Circuit) is a power factor correction circuit, which is an important component used in electronic equipment and can improve the power factor of the AC power supply 7 and improve energy efficiency. The first inverter circuit 82 is a circuit for implementing an inverter process.

[0078] As an example, the drive conversion circuit also includes a PFC circuit 81 and a first inverter circuit 82; the PFC circuit 81 is arranged between the AC power supply 7 and the first inverter circuit 82, and the PFC circuit 81 corrects the phase difference of the current waveform to make it consistent with the voltage waveform, thereby improving the power factor and improving the utilization efficiency of electric energy. In this example, the PFC circuit 81 can convert the AC power output by the AC power supply 7 into DC power, and then output it to the first inverter circuit 82, so that the first inverter circuit 82 can perform inversion processing, convert the DC power into AC power and output it to the transformer T1, so that the transformer T1 performs voltage conversion. It can be understood that the isolation circuit 8 performs AC to DC conversion through the PFC circuit 81, and performs DC to AC conversion through the first inverter circuit 82, so as to achieve the purpose of signal isolation.

[0079] In one embodiment, if Figure 3 As shown, the transformer T1 includes a stator assembly, which includes a magnetic core, a first winding 11 and a second winding 12 arranged on the magnetic core; the first winding 11 is connected to the output end of the first inverter circuit 82; and the second winding 12 is connected to the rectifier inverter circuit 5.

[0080] 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.

[0081] As an example, the transformer T1 includes a rotor assembly and a stator assembly matched with the rotor assembly, the stator assembly includes a magnetic core, a first winding 11 and a second winding 12 arranged on the magnetic core, and the two ends of the first winding 11 are respectively connected to the AC power supply 7, specifically connected to the AC power supply 7 through an isolation circuit 8. When the isolation circuit 8 includes a PFC circuit 81 and a first inverter circuit 82, the two ends of the first winding 11 are respectively connected to the two output ends of the first inverter circuit 82, and the two ends of the second winding 12 are respectively connected to the two connection ends of the rectifier inverter circuit 5, and the other two connection ends of the rectifier inverter circuit 5 are also suitable for connecting to a power battery 6. The first inverter circuit 82 can invert the direct current output by the PFC circuit 81, convert it into alternating current and output it to the first winding 11, so that an induced magnetic field is formed between the first winding 11 and the second winding 12, and the voltage conversion function is realized through the magnetic field between the first winding 11 and the second winding 12.

[0082] In this example, the second winding 12 of the transformer T1 and the motor winding 4 can be independently arranged, that is, the second winding 12 of the transformer T1 can be connected to the power battery 6 through the rectifier inverter circuit 5, and the motor winding 4 can also be connected to the power battery 6 through the rectifier inverter circuit 5.

[0083] In one embodiment, if Figure 3 As shown, the second winding 12 is the motor winding 4 , and the first winding 11 is also suitable for connecting to the power battery 6 .

[0084] As an example, the second winding 12 can be a motor winding 4, so that the magnetic core and the motor winding 4 can be 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 suitable for connecting to the power battery 6, so that a first induced magnetic field is formed between the power battery 6 and the first winding 11, which cooperates with the second induced magnetic field formed around the motor winding 4 to drive the motor winding 4 to work.

[0085] As an example, when the first inverter circuit 82 is not connected to the AC power source 7, and the two connection ends of the first winding 11 and the two connection ends of the rectifier inverter circuit 5 are connected to the power battery 6, the power battery 6 can control the motor winding 4 to rotate to complete the drive control function. The specific control process is as follows: Figure 5 As shown, 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 a first induced magnetic field is formed around the first winding 11; Figure 6 As shown, the direct current output by the power battery 6 is converted into alternating current through 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 that a second induced magnetic field is formed around the motor winding 4; the first induced magnetic field formed by the first winding 11 interacts with the second induced magnetic field formed by the motor winding 4 to drive the motor winding 4 to work.

[0086] In this embodiment, the drive conversion circuit integrates the vehicle-mounted charging circuit and the motor drive circuit, specifically integrating 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 to form a rectifier inverter circuit 5; moreover, the second winding 12 in the transformer T1 and the motor winding 4 in the motor drive circuit are reused to realize the functional merger of electrical components and the change of circuit structure, reduce electrical components and wiring harnesses to meet integration requirements, and help save costs.

[0087] In one embodiment, the first input end of the first inverter circuit 82 is suitable for being connected to the positive electrode of the power battery 6 , and the second input end of the first inverter circuit 82 is suitable for being connected to the negative electrode of the power battery 6 .

[0088] As an example, the first inverter circuit 82 may 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 is the first input end of the first inverter circuit 82, which is used to connect to the first end of the AC power source 7; one end of the two second lower bridge tubes Q12 / Q14 is the second input end of the first inverter circuit 82, which is used to connect to the second end of the AC power source 7, and the midpoints of the two second bridge arms are the first output end and the second output end of the first inverter circuit 82, respectively, which are used to connect to the first end and the second end of the first winding 11, respectively. In this example, the positive electrode of the power battery 6 is connected to the first input end of the first inverter circuit 82 (that is, 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 (that is, 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. Figure 5As shown, in the process of the power battery 6 controlling the motor winding 4 to rotate, the DC power 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 flow back to the power battery 6 through the second lower bridge tube Q12 / Q14 of another second bridge arm, so that a first induced magnetic field is formed around the first winding 11, and the first induced magnetic field can cooperate with the second induced magnetic field formed around the motor winding 4 to drive the motor winding 4 to work. It can be understood that 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 disconnection of the second upper bridge tube Q11 / Q13 and the second lower bridge tube Q12 / Q14 in the first inverter circuit 82 can be controlled to form a loop between the first winding 11 and the power battery 6, so that a first induced magnetic field that can control the rotation of the motor winding 4 is formed around the first winding 11, and the process does not require additional electrical components, so that the high-voltage system as a whole has the advantages of light weight, low failure rate and low cost.

[0089] In one embodiment, the first end of the first winding 11 is suitable for being connected to the positive electrode of the power battery 6 through a first switch K1; the second end of the first winding 11 is suitable for being connected to the negative electrode of the power battery 6 through a second switch K2.

[0090] In one embodiment, the drive conversion circuit also includes a first switch K1 and a second switch K2; the first end of the first winding 11 is suitable for being connected to the positive electrode of the power battery 6 through the first switch K1; the second end of the first winding 11 is suitable for being connected to the negative electrode of the power battery 6 through the second switch K2.

[0091] As an example, the two connection ends of the first winding 11 are respectively connected to the two output ends of the first inverter circuit 82. For example, when the first end of the first winding 11 is connected to 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 to the second output end of the first inverter circuit 82 (i.e., the midpoint of another second bridge arm), the positive electrode of the power battery 6 is connected to the first end of the first winding 11 through the first switch K1, that is, the first end of the first switch K1 is connected to the positive electrode of the power battery 6, and the second end of the first switch K1 is connected to 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 electrode of the power battery 6 is connected to the second end of the first winding 11 through the second switch K2, that is, the first end of the second switch K2 is connected to the negative electrode of the power battery 6, and the second end of the second switch K2 is connected to the connection node between the second output end of the first inverter circuit 82 and the second end of the first winding 11. In the process of the power battery 6 controlling the rotation of the motor winding 4, the DC power output by the power battery 6 needs to flow into the first winding 11 through the first switch K1, and the DC power output by the first winding 11 flows back to the negative electrode of the power battery 6 through the second switch K2, so that a first induced magnetic field is formed around the first winding 11, and the first induced magnetic field can cooperate with the second induced magnetic field formed around the motor winding 4 to drive the motor winding 4 to work. It can be understood that the two ends of the power battery 6 and the two connecting ends of the first winding 11 are connected respectively through the first switch K1 and the second switch K2, and the first switch K1 and the second switch K2 can be controlled to be turned on or off to control the formation of a loop between the first winding 11 and the power battery 6, so that a first induced magnetic field that can control the rotation of the motor winding 4 is formed around the first winding 11, so that the high-voltage system as a whole has the advantages of light weight, low failure rate and low cost.

[0092] In one embodiment, the second winding 12 is the motor winding 4, and the transformer T1 further includes a rotor assembly, in which a permanent magnet is disposed.

[0093] As an example, the second winding 12 can be the motor winding 4, so that the magnetic core and the motor winding 4 can be 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, a permanent magnet is provided in the rotor assembly, and a magnetic field can be formed around the permanent magnet without external power excitation, which cooperates with the second induced magnetic field formed around the motor winding 4 to drive the motor winding 4 to work.

[0094] As an example, when the first inverter circuit 82 is not connected to the AC power source 7, and the two connection ends of the first winding 11 and the two connection ends of the rectifier inverter circuit 5 are connected to the power battery 6, the power battery 6 can control the motor winding 4 to rotate to complete the drive control function. The specific control process is as follows: During the operation of the transformer T1, a first induced magnetic field is formed around the permanent magnet; Figure 6 As shown, the direct current output by the power battery 6 is converted into alternating current through 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 that a second induced magnetic field is formed around the motor winding 4; the first induced magnetic field formed by the first winding 11 interacts with the second induced magnetic field formed by the motor winding 4 to drive the motor winding 4 to work.

[0095] In this embodiment, the drive conversion circuit integrates the vehicle-mounted charging circuit and the motor drive circuit, specifically integrating 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 to form a rectifier inverter circuit 5; moreover, the second winding 12 in the transformer T1 and the motor winding 4 in the motor drive circuit are reused to realize the functional merger of electrical components and the change of circuit structure, reduce electrical components and wiring harnesses to meet integration requirements, and help save costs.

[0096] Compared with the traditional independent design scheme of on-board charging circuit and motor drive circuit, it has the following advantages: First, due to the compact design structure of the integrated drive conversion circuit, it can reduce the wiring harness of high-voltage connection, merge connectors and component structures, and reduce brackets. The integrated system can reduce its volume and mass while ensuring performance, realize the lightweight of the whole vehicle, be more suitable for the layout of the whole vehicle, and contribute to the improvement of vehicle performance. Second, since 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 whole system can reduce the use of electrical components, connectors and wiring harnesses, thereby reducing the failure rate of the whole system. Third, since 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 hours, parts development cycle and electrical equipment structure can also be greatly reduced, while bringing consumers a better driving quality, it can also simplify the assembly of the main engine factory and save costs. Fourthly, due to the reduction of parts, connectors and circuits, the volume of the entire system is reduced, the space utilization of the vehicle is improved, and the transportation capacity of electric vehicles is increased, thereby improving the comfort, economy and endurance of electric vehicles.

[0097] In one embodiment, if Figure 3 and Figure 7As shown, the motor winding 4 includes at least two motor coils L41 / L42 / L43; the first end of each motor coil L41 / L42 / L43 is connected to the midpoint of a first bridge arm, and the second ends of at least two motor coils L41 / L42 / L43 are connected to each other.

[0098] The motor winding 4 includes at least two motor coils L41 / L42 / L43. For example, when the motor winding 4 is a two-phase motor winding 4, it includes two motor coils L41 / L42; when the motor winding 4 is a three-phase motor winding 4, it includes three motor coils L41 / L42 / L43.

[0099] As an example, the rectifier inverter circuit 5 includes at least two first bridge arms, each first bridge arm includes a first upper bridge tube Q51 / Q53 / Q55 and a first lower bridge tube Q52 / Q54 / Q56 arranged in series, at least two first upper bridge tubes Q51 / Q53 / Q55 are used to connect the positive electrode of the power battery 6, at least two first lower bridge tubes Q52 / Q54 / Q56 are used to connect the negative electrode of the power battery 6, the midpoint of each first bridge arm is used to connect the first end of a motor coil L41 / L42 / L43, and at least two motor coils L41 / L42 / L43 are connected to each other. 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 model, the first end of the first upper bridge tube Q51 / Q53 / Q55 is used to connect the positive electrode of the power battery 6, the second end of the first upper bridge tube Q51 / Q53 / Q55 is connected to 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 to connect the negative electrode of the power battery 6, and 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 midpoint of the first bridge arm; among 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 the second ends of the at least two motor coils L41 / L42 / L43 are connected to each other.

[0100] When it is necessary to control the drive conversion circuit to operate so that the AC power supply 7 charges the power battery 6, the working process of the motor winding 4 and the rectifier inverter circuit 5 is as follows: the current output from the first end of the AC power supply 7 flows back to the second end of the AC power supply 7 through the first inverter circuit 82 and the first winding 11 in turn, so that a first induced magnetic field is formed around the first winding 11, so that an induced current is formed between any two motor coils L41 / L42 / L43 of at least two motor coils L41 / L42 / L43. The induced current passes 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 circuit, thereby completing the purpose of charging the power battery 6. At this time, the rectifier inverter circuit 5 can play a rectifying role. Figure 4 As shown, the first induced magnetic field can form an induced current between the motor coil L41 and the motor coil L43, controlling the first upper bridge tube Q51 and the first lower bridge tube Q56 to be turned on, so that a charging circuit is formed between the motor coil L41, the motor coil L43 and the power battery 6. It can be understood that when the motor winding 4 includes N motor coils, it can form There are various combinations, each of which can form a charging circuit between the motor winding 4, the rectifier inverter circuit 5 and the power battery 6, and the corresponding combination can be determined independently according to actual conditions.

[0101] When it is necessary 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 rectifier inverter circuit 5 is as follows: Figure 5 As shown, the DC power output by the power battery 6 flows back to the negative electrode of the power battery 6 directly or indirectly through the first winding 11, so that a first induced magnetic field is formed around the first winding 11; Figure 6 As shown, the DC power output by the power battery 6 is inverted by the rectifier inverter circuit 5, converted into an AC power supply 7 and input into the motor winding 4, so that the motor winding 4 forms a second induced magnetic field, specifically, the DC power 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 coils 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 coils L42 / L43, 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 form a driving circuit to drive the motor winding 4 to work, at this time, the rectifier inverter circuit 5 plays an inverting role. In this example, the first upper bridge tube Q51 / Q53 / Q55 and the corresponding first lower bridge tube Q52 / Q54 / Q56 that need to be turned on can be selected independently according to actual needs.

[0102] In this embodiment, at least two first bridge arms are used in conjunction with at least two motor coils L41 / L42 / L43, so that the rectifier inverter circuit 5 formed thereby can achieve a rectification effect using any two first bridge arms and their corresponding motor coils L41 / L42 / L43, and can also achieve an inversion effect based on all first bridge arms and their corresponding motor coils L41 / L42 / L43, which helps to reduce electrical components, so that the rectifier inverter circuit 5 as a whole has the advantages of being lightweight, having a low failure rate and having a low cost.

[0103] In one embodiment, if Figure 3 and Figure 7 As shown, the first inverter circuit 82 includes two second bridge arms, each second bridge arm 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 to the first end of the AC power supply 7; one end of the two second lower bridge tubes Q12 / Q14 is used to connect to the second end of the AC power supply 7; the midpoints of the two second bridge arms are respectively connected to the two input ends of the first winding 11.

[0104] Among them, the second upper bridge tube Q11 / Q13 is a switch tube for connecting the first end of the AC power supply 7, and the second lower bridge tube Q12 / Q14 is a switch tube for connecting the second end of the AC power supply 7. Here, the second upper bridge tube Q11 / Q13 and the second lower bridge tube Q12 / Q14 can be but are not limited to IGBT tubes.

[0105] As an example, the first inverter circuit 82 includes two second bridge arms, each second bridge arm 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 is the first input end of the first inverter circuit 82, which is used to connect the first end of the AC power supply 7; one end of the two second lower bridge tubes Q12 / Q14 is the second input end of the first inverter circuit 82, which is used to connect the second end of the AC power supply 7, and the midpoints of the two second bridge arms are the first output end and the second output end of the first inverter circuit 82, respectively, which are respectively connected to the two input ends of the first winding 11, and specifically used to connect the first end and the second end of the first winding 11, respectively. 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 model, the first end of the second upper bridge tube Q11 / Q13 is used to connect to the first end of the AC power source 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 to connect to the second end of the AC power source 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; of the two second bridge arms, the midpoint of the second bridge arm is used to connect to the first end of the first winding 11, and the midpoint of the other second bridge arm is used to connect to the second end of the first winding 11. Figure 4 and Figure 5 As shown, during the operation of the first inverter circuit 82, the current output from the first end of the AC power source 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 a second bridge arm, and the current output from the first winding 11 flows back to the second end of the AC power source 7 through the second lower bridge tube Q14 of another second bridge arm to form a loop, so that a first induced magnetic field is formed around the first winding 11, so that it cooperates with the second induced magnetic field formed around the motor winding 4 to complete the charging function or the driving function. It can be understood that the second upper bridge tube Q13 and the second lower bridge tube Q12 are also controlled to be turned on, which can achieve the same effect as the second upper bridge tube Q11 and the second lower bridge tube Q14 being turned on. In this example, the first inverter circuit 82 has a simple overall structure, requires a small number of electrical components, and has the advantages of lightweight structure and low cost.

[0106] In one embodiment, the drive conversion circuit further includes a resonant circuit, which is arranged between the output end of the first inverter circuit 82 and the input end of the first winding 11 .

[0107] As an example, the drive conversion circuit also includes a resonant circuit arranged between the output end of the first inverter circuit 82 and the input end of the first winding 11, and the resonant circuit is used to resonate the signal output by the first inverter circuit 82 to reduce signal fluctuations and ensure constant output of the signal.

[0108] In one embodiment, the resonant circuit includes a resonant inductor L1.

[0109] As an example, the resonant circuit may include but is not limited to a resonant inductor L1, which is arranged between the output end of the first inverter circuit 82 and the input end of the first winding 11, and is used to adjust the resonant frequency of the circuit to make the current and voltage in the circuit stable and reduce signal fluctuations, thereby ensuring constant output of the signal.

[0110] In one embodiment, the drive conversion circuit further includes a DC blocking capacitor C1 , which is disposed between the output end of the first inverter circuit 82 and the input end of the first winding 11 .

[0111] As an example, the drive conversion circuit also includes 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, and the DC blocking and AC passing characteristics of the DC blocking capacitor C1 are utilized to stabilize the voltage and smooth the waveform.

[0112] An embodiment of the present invention provides a high-voltage system, including a power battery 6 and the drive conversion circuit of the above embodiment; both ends of the power battery 6 are connected to the rectifier inverter circuit 5 .

[0113] As an example, when the voltage conversion circuit 1 is connected to the AC power supply 7, and the two connection ends of the rectifier inverter circuit 5 are connected to the two ends of the power battery 6, the control drive conversion circuit works so that the AC power supply 7 can charge the power battery 6. The specific control process is as follows: Figure 4 As shown, the AC power output by the AC power source 7 is boosted by the AC voltage conversion circuit 1 and rectified by the rectifier inverter circuit 5 to convert the low-voltage AC power into stable high-voltage DC power, which is then input into the power battery 6 to charge the power battery 6.

[0114] As an example, when the voltage conversion circuit 1 is not connected to the AC 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 to the two ends of the power battery 6, the power battery 6 can control the rotation of the motor winding 4 to complete the drive control function. The specific control process is as follows: Figure 5 As shown, the DC power output by the power battery 6 flows back to the negative electrode of the power battery 6 through the first winding 11, so that a first induced magnetic field is formed around the first winding 11, or a magnetic field is formed by the permanent magnet on the rotor assembly; Figure 6As shown, the direct current output by the power battery 6 is converted into alternating current through 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 a second induced magnetic field is formed around the motor winding 4; the first induced magnetic field formed by the first winding 11 or the magnetic field formed by the permanent magnet interacts with the second induced magnetic field formed by the motor winding 4 to drive the motor winding 4 to work.

[0115] In this embodiment, the drive conversion circuit adopts an integrated solution of the vehicle-mounted charging circuit and the motor drive circuit, and 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 to form a rectifier inverter circuit 5, thereby realizing the functional merger of electrical components and the change of circuit structure, reducing electrical components and wiring harnesses to meet integration requirements and help save costs.

[0116] Compared with the traditional independent design of vehicle-mounted charging circuit and motor drive circuit, it has the following advantages: First, due to the compact design structure of the integrated drive conversion circuit, it can reduce the wiring harness of high-voltage connection, merge connectors and component structures, and reduce brackets. The integrated system can reduce its volume and mass while ensuring performance, realize the lightweight of the whole vehicle, and is more suitable for the layout of the whole vehicle, and is more conducive to the improvement of vehicle performance. Second, the transformer T1 of the vehicle-mounted charging circuit and the motor winding 4 in the motor drive circuit are integrated in one system. The whole system can reduce the use of electrical components, connectors and wiring harnesses, thereby reducing the failure rate of the whole system. Third, since the integrated solution of the transformer T1 of the vehicle-mounted 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, parts development cycle and electrical equipment structure can also be greatly reduced, which can bring consumers a better driving quality while simplifying the assembly of the main engine factory and saving costs. Fourthly, due to the reduction of parts, connectors and circuits, the volume of the entire system is reduced, the space utilization of the vehicle is improved, and the transportation capacity of electric vehicles is increased, thereby improving the comfort, economy and endurance of electric vehicles.

[0117] Furthermore, when a DC blocking capacitor C1 is provided 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 set between the DC blocking capacitor C1 and the first end of the first winding 11 to avoid the DC blocking and AC passing characteristics of the DC blocking capacitor C1, so that the AC power output from the positive electrode of the power battery 6 cannot flow back to the negative electrode of the power battery 6.

[0118] An embodiment of the present invention provides an automobile, comprising the high-voltage system in the above embodiment.

[0119] As an example, a car includes the high-voltage system in the above embodiment, and the high-voltage system includes the drive conversion circuit in the above embodiment and a power battery 6 connected thereto. The drive conversion circuit adopts an integration solution of an on-board charging circuit and a motor drive circuit. By combining the functions of electrical components and changing the circuit structure, the electrical components and wiring harnesses are reduced to meet the integration requirements and help save costs.

[0120] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the protection scope of the present invention.

Claims

1. A drive conversion circuit, characterized in that: It includes an on-board charging circuit, a motor driving circuit, a transformer, a PFC circuit and a first inverter circuit; The vehicle-mounted charging circuit includes a voltage conversion circuit and a rectifier inverter circuit, and the voltage conversion circuit is suitable for connecting to an AC power source; The motor drive circuit includes the rectifier inverter circuit and the motor winding; The rectifier-inverter circuit is connected to the voltage conversion circuit and the motor winding. The rectifier-inverter circuit is suitable for connecting to a power battery and is used to rectify the alternating current output by the voltage conversion circuit to output direct current to the power battery, or to invert the direct current output by the power battery to output alternating current to the motor winding. The input end of the PFC circuit is suitable for connecting to an AC power supply, and the output end of the PFC circuit is connected to the transformer through the first inverter circuit, and the transformer is also connected to the rectifier inverter circuit. The transformer comprises a stator assembly, wherein the stator assembly comprises a magnetic core, a first winding and a second winding arranged on the magnetic core; the first winding is connected to an output end of the first inverter circuit; the second winding is connected to the rectifier inverter circuit; the second winding is the motor winding; The first input end of the first inverter circuit is suitable for being connected to the positive electrode of the power battery, and the second input end of the first inverter circuit is suitable for being connected to the negative electrode of the power battery; or, the first end of the first winding is suitable for being connected to the positive electrode of the power battery through a first switch; and the second end of the first winding is suitable for being connected to the negative electrode of the power battery through a second switch.

2. The drive conversion circuit according to claim 1, characterized in that: The rectifier inverter circuit comprises at least two first bridge arms, each of the first bridge arms comprises a first upper bridge tube and a first lower bridge tube connected 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; At least two of the first upper bridge tubes are used to connect the positive electrode of the power battery; At least two of the first lower bridge tubes are used to connect the negative electrode of the power battery; Midpoints of at least two of the first bridge arms are connected to the voltage conversion circuit and the motor winding.

3. The drive conversion circuit according to claim 2, characterized in that: The transformer further comprises a rotor assembly in which a permanent magnet is arranged.

4. The drive conversion circuit according to any one of claims 2 to 3, characterized in that: The motor winding comprises at least two motor coils; The first end of each of the motor coils is connected to a midpoint of the first bridge arm, and the second ends of at least two of the motor coils are connected to each other.

5. The drive conversion circuit according to any one of claims 2 to 3, characterized in that: The first inverter circuit includes two second bridge arms, each of the second bridge arms includes a second upper bridge tube and a second lower bridge tube connected in series, and a connection node between the second upper bridge tube and the second lower bridge tube is a midpoint of the second bridge arm; One end of the two second upper bridge tubes is used to connect to the first end of the AC power supply; One end of the two second lower bridge tubes is used to connect to the second end of the AC power supply; The midpoints of the two second bridge arms are respectively connected to the two input ends of the first winding.

6. The drive conversion circuit according to any one of claims 2 to 3, characterized in that: The drive conversion circuit further includes a resonant circuit, which is arranged between an output end of the first inverter circuit and an input end of the first winding.

7. The drive conversion circuit according to claim 6, characterized in that: The resonant circuit includes a resonant inductor.

8. The drive conversion circuit according to any one of claims 2 to 3, characterized in that: The drive conversion circuit further includes a DC blocking capacitor, which is arranged between the output end of the first inverter circuit and the input end of the first winding.

9. A high-voltage system, characterized in that: Comprising a power battery and a drive conversion circuit according to any one of claims 1 to 8; The two ends of the power battery are connected to the rectifier inverter circuit.

10. An automobile, characterized in that: Includes the high voltage system as claimed in claim 9.

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