Electric motor control circuit and system, control method, high-voltage system, and vehicle

Abstract

Disclosed in the present application are an electric motor control circuit and system, a control method, a high-voltage system, and a vehicle. The electric motor control circuit comprises a first electric motor controller, a first inductor, a first switch and a second switch, wherein the first electric motor controller includes a plurality of first half bridges, midpoints of the plurality of first half bridges are used for connecting to electric motor windings of a first electric motor, and two ends of each of the plurality of first half bridges are used for connecting to two ends of a traction battery; first ends of the plurality of first half bridges are connected to a first end of the first switch, and the midpoint of at least one first half bridge is connected to a first end of the second switch by means of the first inductor; a second end of the first switch and a second end of the second switch constitute a first end of the electric motor control circuit, and second ends of the first half bridges constitute a second end of the electric motor control circuit; and the first end and the second end of the electric motor control circuit are respectively used for connecting to two ends of a second electric motor controller, two ends of an electric load or two ends of a charging pile. Boost or buck processing can be performed on the basis of actual situations, so as to meet different requirements; moreover, the circuit has a simple structure, a relatively small size and a relatively low cost.

Description

Motor control circuit, system, control method, high-voltage system and automobile

[0001] The present application claims priority to Chinese Patent Application No. 202510031846.X, filed on January 8, 2025, entitled "Motor control circuit, system, control method, high-voltage system and automobile" and Chinese Patent Application No. 202520044265.5, filed on January 8, 2025, entitled "Motor control circuit, driving system, control system, high-voltage system and automobile", the contents of which are incorporated herein by reference in their entirety. TECHNICAL FIELD

[0002] The present application relates to the technical field of new energy vehicles, in particular to a motor control circuit, system, control method, high-voltage system and automobile. BACKGROUND

[0003] The 800V high-voltage platform of a new energy vehicle is a mainstream choice to solve the problems of range anxiety and slow charging. In the 800V high-voltage platform, high-power fast charging can be achieved by increasing current or increasing voltage. However, high current can cause high heat loss of charging guns, cables, and core components of power batteries, and the theoretical upper limit is not high. Therefore, increasing voltage to improve charging efficiency becomes the mainstream choice. In theory, when the charging current remains unchanged, increasing the battery voltage of the power battery from 400V to 800V can greatly improve the charging power, greatly shorten the charging time of the power battery, and make the charging experience of the power battery close to that of a gasoline vehicle. In existing new energy vehicles, voltage conversion equipment needs to be added to enable the 800V power battery to meet different charging and discharging requirements. This way of adding voltage conversion equipment has the problems of high cost and large space occupation. SUMMARY

[0004] The embodiments of the present application provide a motor control circuit, system, control method, high-voltage system and automobile to solve the problem of high cost and large space occupation caused by adding voltage conversion equipment.

[0005] A motor control circuit, comprising a first motor controller, a first inductor, a first switch and a second switch;

[0006] The first motor controller comprises a plurality of first half-bridges, the midpoints of the plurality of first half-bridges are used to connect motor windings of a first motor, and the two ends of the plurality of first half-bridges are used to connect two ends of a power battery;

[0007] The first ends of the plurality of first half-bridges are connected to the first end of the first switch, and the midpoints of at least one of the first half-bridges are connected to the first end of the second switch through the first inductor;

[0008] The second end of the first switch and the second end of the second switch are the first end of the motor control circuit, and the second end of the plurality of first half-bridges is the second end of the motor control circuit.

[0009] The first end and the second end of the motor control circuit are respectively used for connecting two ends of a second motor controller, two ends of a load or two ends of a charging pile.

[0010] Preferably, the first inductor is the motor winding.

[0011] Preferably, the motor control circuit further comprises a first capacitor and a second capacitor.

[0012] The two ends of the first capacitor are respectively connected to the first end and the second end of the plurality of first half-bridges.

[0013] The two ends of the second capacitor are respectively connected to the first end and the second end of the motor control circuit.

[0014] A motor control system comprising the above motor control circuit and a second motor controller.

[0015] The second motor controller comprises a plurality of second half-bridges, the first end of the plurality of second half-bridges is connected to the first end of the motor control circuit, the second end of the plurality of second half-bridges is connected to the second end of the motor control circuit, and the midpoint of the plurality of second half-bridges is used for connecting the motor winding of the second motor.

[0016] A motor drive system comprising a power battery and the above motor control system.

[0017] The two ends of the power battery are connected to the two ends of the plurality of first half-bridges, so that the power battery directly drives or step-down drives the second motor controller to work.

[0018] Preferably, a generator and an engine are further included, the engine is connected to the generator, and the motor winding of the generator is connected to the first motor controller, so that the generator and the power battery directly drive the second motor controller to work.

[0019] A motor drive method suitable for the above motor drive system, the motor drive method comprising:

[0020] Determining a current drive mode;

[0021] According to the current drive mode, controlling the first switch, the second switch and the first motor controller to perform a target operation, so that the power source corresponding to the current drive mode drives the second motor controller to work.

[0022] Preferably, the controlling the first switch, the second switch and the first motor controller to perform target operations according to the current driving mode, so that the power source corresponding to the current driving mode drives the second motor controller to work, comprises:

[0023] When the current driving mode is the pure electric mode, first demand data is acquired;

[0024] When the first demand data satisfies a preset decoupling condition, the first switch is controlled to be turned off, the second switch is controlled to be turned on, and the upper bridge tube and the lower bridge tube connected to the first inductor in the first motor controller are controlled to be turned on in an interleaved manner, so that the power battery drives the second motor controller to work in a step-down manner;

[0025] When the first demand data does not satisfy the preset decoupling condition, the first switch is controlled to be turned on, and the second switch is controlled to be turned off, so that the power battery directly drives the second motor controller to work.

[0026] Preferably, the first demand data comprises a first voltage difference, and the first voltage difference is a difference between a battery voltage of the power battery and an optimal working voltage of the second motor;

[0027] The preset decoupling condition is that the first voltage difference is greater than a first voltage difference threshold.

[0028] Preferably, the controlling the first switch, the second switch and the first motor controller to perform target operations according to the current driving mode, so that the power source corresponding to the current driving mode drives the second motor controller to work, comprises:

[0029] When the current driving mode is the hybrid mode, the first switch is controlled to be turned on, the second switch is controlled to be turned off, and the engine is controlled to work, so that the generator and the power battery directly drive the second motor controller to work.

[0030] A discharge control system, comprising a power battery and the above motor control circuit;

[0031] Two ends of the power battery are connected to two ends of a plurality of first half-bridges respectively, and a first end and a second end of the motor control circuit are used for connecting two ends of an electric load respectively, so that the power battery directly charges or step-down charges the electric load.

[0032] Preferably, the discharge control system further comprises a generator and an engine, the engine is connected to the generator, and a motor winding of the generator is connected to the first motor controller, so that the generator and the power battery directly charge the electric load.

[0033] A discharge control method, applicable in the discharge control system, the discharge control method comprising:

[0034] acquiring second demand data;

[0035] when the second demand data meets a preset voltage drop condition, controlling the first switch to be off, controlling the second switch to be on, and controlling the upper bridge tube and the lower bridge tube connected to the first inductor in the first motor controller to be on in an interleaved manner, so that the power battery performs voltage drop charging on the power consumption load;

[0036] when the second demand data does not meet the preset voltage drop condition, controlling the first switch to be on and the second switch to be off, so that the power battery performs direct connection charging on the power consumption load.

[0037] Preferably, the second demand data includes a second voltage difference, the second voltage difference being a difference between a battery voltage of the power battery and a demand voltage of the power consumption load.

[0038] The preset voltage drop condition is that the second voltage difference is greater than a second voltage difference threshold.

[0039] Preferably, before the acquiring second demand data, the discharge control method further comprises:

[0040] acquiring a current power of the power battery;

[0041] if the current power of the power battery is less than a preset power, controlling the first switch to be on and the second switch to be off, and controlling the engine to work, so that the generator and the power battery perform direct connection charging on the power consumption load;

[0042] if the current power of the power battery is not less than the preset power, performing the acquiring second demand data.

[0043] A charging control system, comprising a power battery and the above-mentioned motor control circuit;

[0044] two ends of the power battery are connected to two ends of a plurality of the first half-bridge respectively, and a first end and a second end of the motor control circuit are used for connecting two ends of a charging pile respectively, so that the charging pile performs direct connection charging or step-up charging on the power battery.

[0045] Preferably, the charging control system further comprises a third switch, a first end of the third switch being connected to the first end of the motor control circuit, and a second end of the third switch being used for connecting a first end of a charging pile.

[0046] A charging control method, applicable in the charging control system, the charging control method comprising:

[0047] acquire third demand data;

[0048] when the third demand data meets a preset boost condition, control the first switch to be off, control the second switch to be on, and control the lower bridge tube and the upper bridge tube connected with the first inductor in the first motor controller to be on in an interleaved manner, so that the charging pile boosts the power battery for charging;

[0049] when the third demand data does not meet the preset boost condition, control the first switch to be on and the second switch to be off, so that the charging pile directly charges the power battery.

[0050] Preferably, the third demand data includes a third voltage difference, and the third voltage difference is a difference between a battery voltage of the power battery and a highest working voltage of the charging pile.

[0051] The preset boost condition is that the third voltage difference is greater than a third voltage difference threshold.

[0052] Preferably, the charging control system further includes a third switch, a first end of the third switch is connected with the first end of the motor control circuit, and a second end of the third switch is used to connect a first end of a charging pile.

[0053] The charging control method further includes controlling the third switch to be on.

[0054] A high-voltage system includes the above motor control circuit, second motor controller, power battery and driving motor.

[0055] Both ends of the power battery are connected with both ends of a plurality of first half-bridges.

[0056] The second motor controller includes a plurality of second half-bridges, a first end of each of the plurality of second half-bridges is connected with the first end of the motor control circuit, a second end of each of the plurality of second half-bridges is connected with the second end of the motor control circuit, and a midpoint of each of the plurality of second half-bridges is used to connect a motor winding of a driving motor.

[0057] The first end and the second end of the motor control circuit are respectively used to connect both ends of an electrical load or both ends of a charging pile.

[0058] Preferably, the high-voltage system further includes a generator and an engine, the engine is connected with the generator, and a motor winding of the generator is connected with the first motor controller.

[0059] A control device comprises a memory, a processor, and a computer program stored in the memory and executable on the processor, and the processor implements the motor drive method, or the discharge control method, or the charging control method when executing the computer program.

[0060] A vehicle comprises the motor control circuit, or the motor control system, or the motor drive system, or the discharge control system, or the charging control system, or the high-voltage system, or the control device.

[0061] The motor control circuit, system, control method, high-voltage system, and vehicle, the motor control circuit multiplexes the first half-bridge in the first motor controller, adds the first inductor, the first switch, and the second switch, the first end and the second end of the plurality of first half-bridges are connected to the two ends of the power battery, and the first end and the second end of the motor control circuit are used to connect the two ends of the second motor controller, the two ends of the charging pile, or the two ends of the power load, so as to perform voltage boosting or voltage reduction processing according to actual conditions to meet different requirements. Moreover, the entire circuit structure multiplexes the first half-bridge, and different function switching can be realized by adding the inductor and the switch, the entire circuit structure is simple, small in size, and low in cost. BRIEF DESCRIPTION OF DRAWINGS

[0062] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the description of the embodiments of the present application. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0063] FIG. 1 is a circuit schematic diagram of a motor control circuit in an embodiment of the present application;

[0064] FIG. 2 is a circuit schematic diagram of a high-voltage system in an embodiment of the present application.

[0065] Among them, 1, the first motor controller; 2, the second motor controller; L1, the first inductor; K1, the first switch; K2, the second switch; K3, the third switch; C1, the first capacitor; C2, the second capacitor; 3, the power battery; 4, the generator; 5, the engine; 6, the drive motor; 7, the charging pile. DETAILED DESCRIPTION

[0066] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of the present application.

[0067] It should be understood that the present application can be implemented in various forms and should not be interpreted as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that the disclosure will be thorough and complete and will fully convey the scope of the application to those skilled in the art. In the drawings, the sizes and relative sizes of layers and regions can be exaggerated for clarity. Like reference numerals indicate like elements throughout the drawings.

[0068] It should be understood that when an element or layer is referred to as being "on", "adjacent", "connected to", or "coupled to" another element or layer, it can be directly on, adjacent, connected or coupled to the other element or layer, or one or more intervening elements or layers can be present. In contrast, when an element is referred to as being "directly on", "directly adjacent", "directly connected to", or "directly coupled to" another element or layer, then there are no intervening elements or layers present. It will be appreciated that, although terms such as first, second, third, etc. can be used herein to describe various elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms are simply used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, terms first, second, third, etc. discussed below can represent first, second, third, etc. elements, components, regions, layers or sections discussed below without departing from the teachings of the present application.

[0069] 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 orientation depicted in the figures. For example, if a device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" or "over" the other elements or features. 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.

[0070] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the 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 associated items.

[0071] For a thorough understanding of the application, reference will be made to the following detailed description, in which preferred embodiments of the application will be described in conjunction with drawings. The following detailed description and appended drawings describe and illustrate various embodiments of the application.

[0072] The embodiment of the application provides a motor control circuit, as shown in Figure 1, the motor control circuit comprises a first motor controller 1, a first inductor L1, a first switch K1 and a second switch K2; the first motor controller 1 comprises a plurality of first half bridges, the midpoint of the plurality of first half bridges is used for connecting the motor winding of the first motor, and the two ends of the plurality of first half bridges are used for connecting the two ends of the power battery 3; the first end of the plurality of first half bridges is connected with the first end of the first switch K1, and the midpoint of at least one first half bridge is connected with the first end of the second switch K2 through the first inductor L1; the second end of the first switch K1 and the second end of the second switch K2 are the first end of the motor control circuit, and the second end of the plurality of first half bridges is the second end of the motor control circuit; the first end and the second end of the motor control circuit are respectively used for connecting the two ends of the second motor controller 2, the two ends of the load or the two ends of the charging pile 7.

[0073] Wherein, the first motor controller 1 is an inverter of the first motor, the first motor controller 1 comprises a plurality of first half bridges, the first half bridge comprises a series connection of an upper bridge tube S1 and a lower bridge tube S2, and the connection node between the upper bridge tube S1 and the lower bridge tube S2 is the midpoint of the first half bridge. The midpoint of each first half bridge is used for connecting the motor winding of the first motor, the first end and the second end of the plurality of first half bridges are connected with the positive electrode and the negative electrode of the power battery 3 respectively, and the first motor controller 1 can perform inverting processing on the direct current output by the power battery 3 to drive the first motor to work. In the example, the first motor can drive the motor, and can also be a generator 4. The power battery 3 in the example can be a 400V power battery, or an 800V power battery, and is preferably an 800V power battery.

[0074] As an example, the motor control circuit reuses the first motor controller 1 and also includes a first inductor L1, a first switch K1, and a second switch K2. The first ends of multiple first half-bridges are connected to the first end of the first switch K1, and the second end of the first switch K1 is the first end of the motor control circuit. At least one midpoint of the first half-bridge is connected to the first end of the second switch K2 through the first inductor L1, and the second end of the second switch K2 is the first end of the motor control circuit. The second ends of the multiple first half-bridges are the second ends of the motor control circuit. In this example, the first and second ends of the motor control circuit are used to connect to the two ends of the second motor controller 2, the two ends of the electrical load, or the two ends of the charging pile 7.

[0075] In this example, the first and second terminals of the motor control circuit can be connected to the second motor controller 2. The midpoints of the multiple second half-bridges of the second motor controller 2 are used to connect the motor windings of the second motor. The first switch K1, the second switch K2, and the first motor controller 1 can be controlled to operate according to actual conditions to ensure the second motor is at its optimal operating voltage point. For example, when the battery voltage of the power battery 3 matches the optimal operating voltage of the second motor, the first switch K1 can be turned on, the second switch K2 can be turned off, and the first motor controller 1 can be deactivated, allowing the power battery 3 to directly power the second motor controller 2. When the battery voltage of the power battery 3 does not match the optimal operating voltage of the second motor, specifically when the battery voltage of the power battery 3 is greater than the optimal operating voltage of the second motor, the first switch K1 can be turned off, and the second switch K2 can be turned on, decoupling the battery voltage of the power battery 3 from the operating voltage of the second motor. The first motor controller 1 can then be controlled to reduce the voltage to the optimal operating voltage of the second motor, ensuring efficient operation of the second motor. In this example, when the first switch K1 is open and the second switch K2 is open, the upper bridge transistor S1 and the lower bridge transistor S2 of the first motor controller 1 are alternately controlled to work. The specific control process is as follows: (1) First, control the upper bridge transistor S1 connected to the first inductor L1 to be open, so that the current output from the positive terminal of the power battery 3 passes through the first inductor L1 and the second motor controller 2 in sequence and flows back to the negative terminal of the power battery 3, so that the power battery 3 charges the first inductor L1 and the second motor controller 2. Since the first inductor L1 and the second motor controller 2 are connected in series, the voltage across the second motor controller 2 is less than the battery voltage of the power battery 3, so as to reduce the battery voltage of the power battery 3 to adjust to the optimal working voltage of the second motor, so as to ensure the efficient operation of the second motor; (2) Control the lower bridge transistor S2 connected to the first inductor L1 to be open. Since the current of the first inductor L1 cannot change abruptly, the current of the first inductor L1 flows through the second motor controller 2 to form a return flow, so as to cooperate with the power battery 3 to complete the voltage reduction adjustment process. In this example, two voltages matching means that the voltage difference between the two voltages is less than a preset threshold, while two voltages not matching means that the voltage difference between the two voltages is not less than a preset threshold.

[0076] In the example, the first end and the second end of the motor control circuit can be connected to the electrical load. According to actual conditions, the first switch K1, the second switch K2 and the first motor controller 1 can be controlled to work to realize direct charging or step-down charging of the electrical load. For example, the first switch K1 is controlled to be turned on, the second switch K2 is controlled to be turned off, and the first motor controller 1 is controlled to be not working, so that the power battery 3 directly supplies power to the electrical load. Alternatively, the first switch K1 can be controlled to be turned off, the second switch K2 can be controlled to be turned on, and the first motor controller 1 can be controlled to work, so that the battery voltage of the power battery 3 is greater than the charging voltage of the electrical load, to realize step-down charging of the electrical load. In the example, when the first switch K1 is turned off and the second switch K2 is turned on, the upper bridge tube S1 and the lower bridge tube S2 of the first motor controller 1 are controlled to work in an interleaving manner, to realize the step-down charging process of the electrical load as follows: (1) the upper bridge tube S1 connected to the first inductor L1 is controlled to be turned on, so that the current output from the positive electrode of the power battery 3 flows through the first inductor L1 and the electrical load in sequence, and returns to the negative electrode of the power battery 3, so that the power battery 3 charges the first inductor L1 and the electrical load. Since the first inductor L1 and the electrical load are connected in series, the voltage across the electrical load is less than the battery voltage of the power battery 3, so as to achieve the purpose of step-down charging; (2) the lower bridge tube S2 connected to the first inductor L1 is controlled to be turned on. Since the current of the first inductor L1 cannot be suddenly changed, the current of the first inductor L1 flows through the electrical load to form a return flow, so as to complete the purpose of step-down charging of the electrical load by the power battery 3. The electrical load can be the power battery 3 of another vehicle, so as to charge the other vehicle to supplement the power of the other vehicle, or can be another load.

[0077] In this example, the first and second terminals of the motor control circuit can be connected to the charging pile 7. Depending on the actual situation, the first switch K1, the second switch K2, and the first motor controller 1 can be controlled to operate, allowing the charging pile 7 to directly charge the power battery 3 or perform boost charging. For example, when the battery voltage of the power battery 3 matches the maximum operating voltage of the charging pile 7, the first switch K1 can be turned on, the second switch K2 can be turned off, and the first motor controller 1 can be deactivated, allowing the charging pile 7 to directly charge the power battery 3. When the battery voltage of the power battery 3 is higher than the maximum operating voltage of the charging pile 7, for example, when the battery voltage of the power battery 3 is 800V and the maximum operating voltage of the charging pile 7 is 500V, the first switch K1 can be turned off, the second switch K2 can be turned on, and the first motor controller 1 can be activated, causing the motor control circuit to boost the charging voltage of the charging pile 7, making the charging voltage across the power battery 3 greater than the supply voltage of the charging pile 7, thus achieving the purpose of boost control. In this example, when the first switch K1 is open and the second switch K2 is open, the upper bridge transistor S1 and the lower bridge transistor S2 of the first motor controller 1 are alternately controlled to work. The specific control process is as follows: (1) First, control the lower bridge transistor S2 connected to the first inductor L1 to be open so that the current output from the first end of the charging pile 7 flows through the first inductor L1 and flows back to the second end of the charging pile 7 so that the charging pile 7 charges the first inductor L1; (2) Control the upper bridge transistor S1 connected to the first inductor L1 to be open so that the current output from the first end of the charging pile 7 passes through the first inductor L1 and the power battery 3 in sequence and flows back to the second end of the charging pile 7 so that the charging pile 7 charges the power battery 3. Due to the volt-second characteristic that the current of the first inductor L1 cannot change abruptly, the first inductor L1 also charges the power battery 3, so that the charging voltage at both ends of the power battery 3 is greater than the power supply voltage of the charging pile 7, thereby realizing the boost charging function.

[0078] In this example, the motor control circuit reuses the first half-bridge in the first motor controller 1, adding a first inductor L1, a first switch K1, and a second switch K2. The first and second ends of multiple first half-bridges are connected to the two ends of the power battery 3. The first and second ends of the motor control circuit are used to connect to the two ends of the second motor controller 2, the two ends of the electrical load, or the two ends of the charging pile 7, to perform boost or buck processing according to actual conditions to meet different needs. Moreover, the entire circuit structure reuses the first half-bridge, and different function switching can be achieved by adding inductors and switches. The entire circuit structure is simple, small in size, and low in cost, and can meet different charging and discharging requirements.

[0079] In one embodiment, the first inductor L1 is a motor winding.

[0080] As an example, the first inductor L1 can be a motor winding in the first motor. In this example, the second switch K2 can be connected to the motor winding of the first motor connected to the midpoint of multiple first half-bridges, so that at least one motor winding can be identified as the first inductor L1. This can further reduce the number of components in the circuit, making it smaller and cheaper.

[0081] In one embodiment, the motor control circuit further includes a first capacitor C1 and a second capacitor C2; the two ends of the first capacitor C1 are respectively connected to the first and second ends of a plurality of first half-bridges; the two ends of the second capacitor C2 are respectively connected to the first and second ends of the motor control circuit.

[0082] As an example, the motor control circuit also includes a first capacitor C1 and a second capacitor C2. The two ends of the first capacitor C1 are connected to the first and second ends of a plurality of first half-bridges, respectively. Since the first and second ends of the plurality of first half-bridges are respectively connected to the two ends of the power battery 3, the first capacitor C1 can regulate the input or output voltage of the power battery 3 to prevent voltage fluctuations from affecting the normal operation of the entire circuit. The two ends of the second capacitor C2 are connected to the first and second ends of the motor control circuit, respectively. The first and second ends of the motor control circuit are used to connect to the two ends of the second motor controller 2, the two ends of the electrical load, or the two ends of the charging pile 7, so that the second capacitor C2 can regulate the input or output voltage of the motor control circuit to prevent voltage fluctuations from affecting the normal operation of the entire circuit.

[0083] When the power battery 3 is an 800V power battery, if the motor is directly driven by the power battery 3, the motor will work at 800V due to the coupling between the motor's operating voltage and the battery voltage of the power battery 3. Under high voltage, some motor operating conditions have lower efficiency. Therefore, it is necessary to reduce the battery voltage of the power battery 3 to improve the motor efficiency.

[0084] This application provides a motor control system, including the motor control circuit in the above embodiment, and also includes a second motor controller 2; the second motor controller 2 includes a plurality of second half-bridges, the first ends of the plurality of second half-bridges are connected to the first end of the motor control circuit, the second ends of the plurality of second half-bridges are connected to the second end of the motor control circuit, and the midpoint of the plurality of second half-bridges is used to connect the motor windings of the second motor.

[0085] The second motor controller 2 is the inverter for the second motor. It includes multiple second half-bridges, each consisting of an upper bridge transistor S1 and a lower bridge transistor S2 connected in series. The connection point between the upper and lower bridge transistors S1 and S2 is the midpoint of the second half-bridge. The midpoint of each second half-bridge is used to connect to the motor windings of the second motor. The first and second ends of the multiple second half-bridges are respectively connected to the first and second ends of the motor control circuit. The second motor controller 2 can invert the DC power directly output from the power battery 3 or the DC power processed by the motor control circuit to drive the second motor.

[0086] As an example, the motor control system includes the motor control circuit and the second motor controller 2 as described in the above embodiments. The motor control circuit includes a first motor controller 1, a first inductor L1, a first switch K1, and a second switch K2. The two ends of multiple first half-bridges are connected to the two ends of the power battery 3. The first ends of the multiple first half-bridges are connected to the first ends of multiple second half-bridges through the first switch K1. The midpoints of the multiple first half-bridges are connected to the first ends of the multiple second half-bridges through the first inductor L1 and the second switch K2. The second ends of the multiple first half-bridges are connected to the second ends of the multiple second half-bridges. In other words, the power battery 3 is connected to the second motor controller 2 through the motor control circuit, and the second motor controller 2 is connected to the second motor. It can control the operation of the first switch K1, the second switch K2, and the first motor controller 1 according to actual conditions to ensure that the second motor is at its optimal operating voltage point.

[0087] For example, when the battery voltage of the power battery 3 matches the optimal operating voltage of the second motor, the first switch K1 can be turned on and the second switch K2 can be turned off, and the first motor controller 1 can be deactivated, so that the power battery 3 can directly supply power to the second motor controller 2, thereby ensuring the efficient operation of the second motor connected to the second motor controller 2.

[0088] For example, when the battery voltage of the power battery 3 does not match the optimal operating voltage of the second motor, specifically when the battery voltage of the power battery 3 is greater than the optimal operating voltage of the second motor, the first switch K1 can be opened and the second switch K2 can be turned on to decouple the battery voltage of the power battery 3 from the operating voltage of the second motor, and the first motor controller 1 can be controlled to work so that the voltage at both ends of the second motor is adjusted to the optimal operating voltage of the second motor to ensure the efficient operation of the second motor. In this example, when the first switch K1 is open and the second switch K2 is open, the upper bridge transistor S1 and the lower bridge transistor S2 of the first motor controller 1 are alternately controlled to work. The specific control process is as follows: (1) First, control the upper bridge transistor S1 connected to the first inductor L1 to be open, so that the current output from the positive terminal of the power battery 3 passes through the first inductor L1 and the second motor controller 2 in sequence and flows back to the negative terminal of the power battery 3, so that the power battery 3 charges the first inductor L1 and the second motor controller 2. Since the first inductor L1 and the second motor controller 2 are connected in series, the voltage across the second motor controller 2 is less than the battery voltage of the power battery 3, so that the voltage across the second motor is adjusted to the optimal working voltage of the second motor, so as to ensure the efficient operation of the second motor; (2) Control the lower bridge transistor S2 connected to the first inductor L1 to be open. Since the current of the first inductor L1 cannot change abruptly, the current of the first inductor L1 flows through the second motor controller 2 to form a return flow, so as to cooperate with the power battery 3 to complete the voltage reduction adjustment process.

[0089] This application provides a motor drive system, including a power battery 3 and a motor control system as described in the above embodiment; the two ends of the power battery 3 are connected to the two ends of a plurality of first half-bridges, so that the power battery 3 directly drives or steps down drives the second motor controller 2.

[0090] As an example, the motor drive system includes a power battery 3 and the motor control system described in the above embodiment. The two ends of the power battery 3 are connected to the two ends of multiple first half-bridges in the first motor controller 1. The first ends of the multiple first half-bridges are connected to the first ends of multiple second half-bridges via a first switch K1. The midpoint of at least one first half-bridge is connected to the first ends of multiple second half-bridges via a first inductor L1 and a second switch K2. The second ends of the multiple first half-bridges are connected to the second ends of multiple second half-bridges. In other words, the power battery 3 is connected to the second motor controller 2 via a motor control circuit. The second motor controller 2 is connected to the second motor and can control the operation of the first switch K1, the second switch K2, and the first motor controller 1 according to actual conditions to ensure that the second motor is at its optimal operating voltage point.

[0091] In this example, when the battery voltage of the power battery 3 matches the optimal operating voltage of the second motor—for example, when the battery voltage of the power battery 3 is 800V and the optimal operating voltage of the second motor is also 800V—the first switch K1 can be turned on and the second switch K2 can be turned off. The first motor controller 1 will not operate, allowing the power battery 3 to directly drive the second motor controller 2, thereby driving the second motor. When the battery voltage of the power battery 3 does not match the optimal operating voltage of the second motor—specifically, when the battery voltage of the power battery 3 is higher than the optimal operating voltage of the second motor—for example, when the battery voltage of the power battery 3 is 800V and the optimal operating voltage of the second motor is 400V—the first switch K1 can be turned off and the second switch K2 can be turned on. This controls the first motor controller 1 to operate, reducing the voltage of the power battery 3 to adjust the voltage across the second motor to its optimal operating voltage. This allows the power battery 3 to drive the second motor controller 2, thereby driving the second motor and ensuring its efficient operation. When the first switch K1 is open and the second switch K2 is open, the upper bridge transistor S1 and the lower bridge transistor S2 of the first motor controller 1 are alternately controlled to adjust the battery voltage of the power battery 3 to the optimal operating voltage of the second motor, so as to ensure the efficient operation of the second motor.

[0092] In one embodiment, the motor drive system further includes a generator 4 and an engine 5, with the engine 5 connected to the generator 4. The motor windings of the generator 4 are connected to a first motor controller 1, so that the generator 4 and the power battery 3 directly drive the second motor controller 2 to work.

[0093] As an example, the electric drive system also includes a generator 4 and an engine 5. The engine 5 is connected to the generator 4, which is used to connect the generator 4 to the first motor controller 1. The engine 5 drives the generator 4 to rotate and generate electricity. The current generated by the generator 4 drives the second motor through the first motor controller 1. In this example, when the first switch K1 is on and the second switch K2 is on; if the engine 5 is not working, the power battery 3 directly drives the second motor to work, thus entering pure electric mode; if the engine 5 drives the generator 4 to work, the generator 4 and the power battery 3 can directly drive the second motor controller 2 to work. At this time, the generator 4 and the power battery 3 together drive the second motor to work, thus entering hybrid mode.

[0094] This application provides a motor driving method applicable to the motor control system described in the above embodiments, specifically applicable to a control device connected to the motor control system. This control device can be a vehicle control unit (VCU) installed in an automobile. The motor driving method includes:

[0095] S11: Determine the current drive mode;

[0096] S12: Based on the current driving mode, control the first switch K1, the second switch K2 and the first motor controller to perform the target operation so that the power source corresponding to the current driving mode drives the second motor controller 2 to work.

[0097] The current driving mode refers to the driving mode at the current moment. As an example, the current driving mode can be either hybrid mode or pure electric mode. Hybrid mode refers to a mode in which there are other power sources besides the power battery 3; pure electric mode refers to a mode in which only the power battery 3 is used as the power source.

[0098] As an example, the VCU can determine the current drive mode via the CAN bus or other means. Then, it invokes the control strategy corresponding to the current drive mode to control the first switch K1, the second switch K2, and the first motor controller 1 to perform the target operation. That is, it controls the first switch K1 to open or close, controls the second switch K2 to open or close, and controls the switching transistors in the first motor controller 1 to open or close, so that the power source corresponding to the current drive mode drives the second motor controller 2 to work, and the second motor controller 2 controls the second motor to work. In this example, when the current drive mode is hybrid mode, it is necessary to control the power battery 3 and other power sources to drive the second motor controller 2 together; when the current drive mode is pure electric mode, it is necessary to control the power battery 3 to drive the second motor controller 2 alone.

[0099] In one embodiment, step S12, which involves controlling the first switch K1, the second switch K2, and the first motor controller to perform a target operation based on the current driving mode, so that the power source corresponding to the current driving mode drives the second motor controller 2 to work, includes:

[0100] S121: When the current driving mode is pure electric mode, obtain the first demand data;

[0101] S122: When the first demand data meets the preset decoupling conditions, control the first switch K1 to open, control the second switch K2 to turn on, and alternately control the upper bridge tube S1 and the lower bridge tube S2 connected to the first inductor L1 in the first motor controller 1 to turn on, so that the power battery 3 can drive the second motor controller 2 to work by stepping down the voltage.

[0102] S123: When the first demand data does not meet the preset decoupling conditions, control the first switch K1 to turn on and control the second switch K2 to turn off, so that the power battery 3 directly drives the second motor controller 2 to work.

[0103] The first demand data reflects the charging and discharging demand between the power battery 3 and the second motor. The preset decoupling condition is a pre-set condition used to decouple the relationship.

[0104] As an example, when the current drive mode is pure electric mode, the VCU needs to further obtain the first demand data through the CAN bus or other communication methods. Then, it compares the first demand data with the preset decoupling conditions so that, based on the comparison result, it controls the first switch K1, the second switch K2 and the first motor controller 1 to perform the target operation.

[0105] As an example, when the first demand data meets the preset decoupling conditions, the VCU can decouple the battery voltage of the power battery 3 and the operating voltage of the second motor, so that the operating voltage of the second motor does not have to follow the battery voltage of the power battery 3. At this time, the first switch K1 can be turned off and the second switch K2 can be turned on, and the upper bridge transistor S1 and the lower bridge transistor S2 connected to the first inductor L1 in the first motor controller 1 can be turned on alternately to reduce the battery voltage of the power battery 3 to the optimal operating voltage of the second motor, so as to achieve the purpose of voltage reduction drive and thus ensure the efficient operation of the second motor.

[0106] In this example, the first switch K1 is controlled to be open, the second switch K2 is controlled to be open, and the upper bridge tube S1 and the lower bridge tube S2 connected to the first inductor L1 in the first motor controller 1 are controlled to be open in an alternating manner. The specific control process is as follows: (1) First, the upper bridge tube S1 connected to the first inductor L1 is controlled to be open so that the current output from the positive terminal of the power battery 3 passes through the first inductor L1 and the second motor controller 2 in sequence and flows back to the negative terminal of the power battery 3, so that the power battery 3 charges the first inductor L1 and the second motor controller 2. Since the first inductor L1 and the second motor controller 2 are connected in series, the voltage across the second motor controller 2 is less than the battery voltage of the power battery 3, so as to reduce the battery voltage of the power battery 3 to adjust to the optimal working voltage of the second motor, so as to ensure the efficient operation of the second motor; (2) The lower bridge tube S2 connected to the first inductor L1 is controlled to be open. Since the current of the first inductor L1 cannot change abruptly, the current of the first inductor L1 flows through the second motor controller 2 to form a return flow, so as to cooperate with the power battery 3 to complete the voltage reduction adjustment process.

[0107] In one embodiment, the first demand data includes a first voltage difference, which is the difference between the battery voltage of the power battery 3 and the optimal operating voltage of the second motor; the preset decoupling condition is that the first voltage difference is greater than the first voltage difference threshold.

[0108] The battery voltage of power battery 3 is, for example, 800V. The optimal operating voltage of the second motor refers to the operating voltage at which the second motor operates at its most efficient state. The first differential pressure threshold is a pre-set threshold used to assess whether the first voltage difference reaches a relatively large differential pressure standard.

[0109] As an example, the VCU needs to obtain the battery voltage of the power battery 3 and the optimal operating voltage of the second motor. Then, the difference between the battery voltage of the power battery 3 and the optimal operating voltage of the second motor is determined as the first voltage difference. Next, the first voltage difference is compared with the first voltage difference threshold. If the first voltage difference is greater than the first voltage difference threshold, it is determined that the battery voltage of the power battery 3 is much higher than the optimal operating voltage of the second motor. For example, the battery voltage of the power battery 3 is 800V, while the optimal operating voltage of the second motor is 400V. The first voltage difference between the two is large. At this time, the first switch K1 can be opened and the second switch K2 can be turned on to control the first motor controller 1 to perform voltage reduction processing. This can decouple the battery voltage of the power battery 3 from the operating voltage of the second motor and adjust the voltage to the optimal operating voltage of the second motor to ensure the efficient operation of the second motor. Conversely, if the first voltage difference is not greater than the first voltage difference threshold, it is determined that the battery voltage of the power battery matches the optimal operating voltage of the second motor. At this time, the first switch K1 can be turned on and the second switch K2 can be opened to allow the power battery 3 to directly drive the second motor controller 2.

[0110] In one embodiment, according to the current driving mode, the first switch K1, the second switch K2, and the first motor controller are controlled to perform a target operation so that the power source corresponding to the current driving mode drives the second motor controller 2 to work. This includes: when the current driving mode is a hybrid mode, controlling the first switch K1 to be turned on and the second switch K2 to be turned off, controlling the engine 5 to work so that the generator 4 and the power battery 3 drive the second motor controller 2 to work.

[0111] As an example, in an electric motor drive system including a generator 4 and an engine 5, where the engine 5 is connected to the generator 4 and the motor windings of the generator 4 are connected to the first motor controller 1, when the VCU determines that the current drive mode is a hybrid mode, it needs to control the first switch K1 to be turned on and the second switch K2 to be turned off, thereby controlling the engine 5 to work so that the engine 5 drives the generator 4 to rotate, causing the motor windings of the generator 4 to generate current. The current generated by the generator 4 and the current output by the power battery 3 flow through the first switch K1 to the second motor controller 2. The second motor controller 2 performs inverter processing on the received current to drive the second motor to work, thereby achieving a hybrid effect.

[0112] When the power battery 3 is an 800V power battery, the power battery 3 can be connected to both ends of the electrical load through the above-mentioned motor control circuit so that the power battery 3 can charge the electrical load. In this process, if the power battery 3 is directly supplied with power, the electrical load may be damaged because the battery voltage of the power battery 3 is much higher than the voltage required by the electrical load. Therefore, it is necessary to reduce the voltage of the power battery 3 to ensure the safety of the power battery 3 in charging the electrical load.

[0113] This application provides a discharge control system, including a power battery 3 and a motor control circuit as described in the above embodiment; the two ends of the power battery 3 are respectively connected to the two ends of a plurality of first half-bridges, and the first end and the second end of the motor control circuit are respectively used to connect to the two ends of the electrical load, so that the power battery 3 can directly charge or step-down charge the electrical load.

[0114] As an example, the discharge control system includes a power battery 3 and the motor control circuit in the above embodiment. The two ends of the power battery 3 are respectively connected to the two ends of multiple first half-bridges. The first and second ends of the motor control circuit are respectively used to connect to the two ends of the electrical load. Depending on the actual situation, the first switch K1, the second switch K2, and the first motor controller 1 can be controlled to operate, thereby achieving direct charging or step-down charging of the electrical load. For example, controlling the first switch K1 to be on, the second switch K2 to be off, and the first motor controller 1 to be off, allows the power battery 3 to directly supply power to the electrical load. Alternatively, the first switch K1 can be turned off and the second switch K2 can be turned on to control the first motor controller 1 to work and perform step-down charging on the electrical load. The specific control process is as follows: (1) First, control the upper bridge tube S1 connected to the first inductor L1 to turn on, so that the current output from the positive terminal of the power battery 3 passes through the first inductor L1 and the electrical load in sequence and flows back to the negative terminal of the power battery 3, so that the power battery 3 charges the first inductor L1 and the electrical load. Since the first inductor L1 and the electrical load are connected in series, the voltage across the electrical load is less than the battery voltage of the power battery 3, so as to achieve the purpose of step-down charging; (2) Control the lower bridge tube S2 connected to the first inductor L1 to turn on. Since the current of the first inductor L1 cannot change abruptly, the current of the first inductor L1 flows through the electrical load to form a return current, so as to cooperate with the power battery 3 to complete the purpose of step-down charging on the electrical load. The electrical load here can be the power battery 3 of other vehicles or other loads.

[0115] In one embodiment, the discharge control system further includes a generator 4 and an engine 5, the engine 5 being connected to the generator 4, and the motor windings of the generator 4 being connected to a first motor controller 1, so that the generator 4 and the power battery 3 can directly charge the electrical load.

[0116] As an example, the discharge control system also includes a generator 4 and an engine 5. The engine 5 is connected to the generator 4, which is connected to the first motor controller 1. The engine 5 generates electricity by driving the generator 4 to rotate. The current generated by the generator 4 is output to the electrical load to charge it. In this example, when the first switch K1 is on and the second switch K2 is on; if the engine 5 is not working, the power battery 3 charges the electrical load; if the engine 5 drives the generator 4 to work, the generator 4 and the power battery 3 charge the electrical load together.

[0117] This application provides a discharge control method applicable to the motor control system described in the above embodiments, specifically applicable to a control device connected to the motor control system. This control device can be a vehicle control unit (VCU) installed in an automobile. The motor drive method includes:

[0118] S21: Obtain the second requirement data;

[0119] S22: When the second demand data meets the preset voltage reduction condition, control the first switch K1 to open, control the second switch K2 to turn on, and alternately control the upper bridge tube S1 and the lower bridge tube S2 connected to the first inductor L1 in the first motor controller 1 to turn on, so that the power battery 3 can perform voltage reduction charging on the electrical load.

[0120] S23: When the second demand data does not meet the preset voltage reduction condition, control the first switch K1 to be turned on and the second switch K2 to be turned off, so that the power battery 3 can directly charge the electrical load.

[0121] The second demand data reflects the charging and discharging demand between the power battery 3 and the electrical load. The preset voltage reduction condition is a pre-set condition used to assess whether the discharge voltage of the power battery 3 needs to be reduced.

[0122] As an example, the VCU is connected to the two ends of the electrical load at the first and second ends of the motor control circuit, respectively. When the electrical load needs to be discharged, it needs to obtain the second demand data through the CAN bus or other communication methods. Then, the second demand data is compared with the preset step-down conditions so as to determine the discharge method for discharging the electrical load based on the comparison results.

[0123] As an example, when the second demand data meets the preset step-down condition, the VCU can control the first switch K1 to open and the second switch K2 to open, and alternately control the upper bridge transistor S1 and the lower bridge transistor S2 connected to the first inductor L1 in the first motor controller 1 to open, so that the power battery 3 can perform step-down charging of the electrical load. The specific control process is as follows: (1) First, control the upper bridge transistor S1 connected to the first inductor L1 to open, so that the current output from the positive terminal of the power battery 3 passes through the first inductor L1 and the electrical load in sequence and flows back to the first inductor L1. The negative terminal of the power battery 3 enables the power battery 3 to charge the first inductor L1 and the electrical load. Since the first inductor L1 and the electrical load are connected in series, the voltage across the electrical load is less than the battery voltage of the power battery 3, so as to achieve the voltage reduction charging effect and ensure the charging efficiency of the electrical load; (2) Control the lower bridge tube S2 connected to the first inductor L1 to conduct. Since the current of the first inductor L1 cannot change abruptly, the current of the first inductor L1 flows through the electrical load to form a return current, so as to cooperate with the power battery 3 to complete the voltage reduction adjustment process.

[0124] As an example, when the second demand data does not meet the preset step-down conditions, the VCU can control the first switch K1 to be turned on and the second switch K2 to be turned off, so that the power battery 3 can directly charge the electrical load to ensure the charging efficiency of the electrical load.

[0125] In one embodiment, the second demand data includes a second voltage difference, which is the difference between the battery voltage of the power battery 3 and the demand voltage of the electrical load; the preset voltage reduction condition is that the second voltage difference is greater than the second voltage difference threshold.

[0126] The voltage of power battery 3 is defined as follows: For example, the voltage of power battery 3 is 800V. The required voltage of the electrical load is defined as the voltage required by the electrical load, which is the voltage at which the electrical load operates normally. For example, when the electrical load is the power battery 3 of another vehicle, if the other vehicle uses an 800V architecture, its required voltage is 800V or close to 800V; if the other vehicle uses a 400V architecture, its required voltage is 400V or close to 400V. The second voltage difference threshold is a pre-set threshold used to assess whether the second voltage difference reaches a large voltage difference standard.

[0127] As an example, the VCU can obtain the battery voltage of the power battery 3 and the required voltage of the electrical load; then, it determines the difference between the battery voltage of the power battery 3 and the required voltage of the electrical load as a second voltage difference; next, it compares the second voltage difference with a second voltage difference threshold; if the second voltage difference is greater than the second voltage difference threshold, it is determined that the voltage of the power battery 3 is much higher than the required voltage of the electrical load. If the electrical load is directly charged, it will affect the normal operation of the electrical load. Therefore, it is necessary to reduce the voltage of the power battery 3, and it can be determined that it meets the preset voltage reduction condition; conversely, if the second voltage difference is not greater than the second voltage difference threshold, it is determined that the battery voltage of the power battery 3 matches the required voltage of the electrical load, and the electrical load can be directly charged to ensure the charging efficiency of the electrical load.

[0128] In one embodiment, before step S21, i.e. before acquiring the second demand data, the discharge control method further includes:

[0129] Obtain the current charge level of power battery 3;

[0130] If the current charge of the power battery 3 is less than the preset charge, the first switch K1 is turned on and the second switch K2 is turned off, and the engine 5 is turned on so that the generator 4 and the power battery 3 can directly charge the electrical load.

[0131] If the current charge level of the power battery 3 is not less than the preset charge level, then the process of obtaining the second required data will be executed.

[0132] The current battery level is the battery level at the current moment, and the preset battery level is the battery level that is set in advance to assess whether the battery level has reached a lower standard.

[0133] As an example, the VCU can obtain the current charge level of the power battery 3 and compare it with the preset charge level. If the current charge level of the power battery 3 is less than the preset charge level, it is determined that the charge level of the power battery 3 is small and may not be able to meet the needs of the electrical load. At this time, the first switch K1 can be turned on and the second switch K2 can be turned off to control the engine 5 to work and drive the generator 4 to rotate, thereby generating current in the generator 4 so that the generator 4 and the power battery 3 can directly charge the electrical load. If the current charge level of the power battery 3 is not less than the preset charge level, it is determined that the charge level of the power battery 3 is large and can basically meet the needs of the electrical load. At this time, steps S21-S23 can be executed.

[0134] When the power battery 3 is an 800V power battery, it is generally necessary to use a charging pile 7 with a maximum working voltage of 800V for charging. If the maximum working voltage of the charging pile 7 is lower than the battery voltage of the power battery 3, the charging efficiency of the power battery 3 will be low.

[0135] This application provides a charging control system, including a power battery 3 and a motor control circuit as described in the above embodiment; the two ends of the power battery 3 are respectively connected to the two ends of a plurality of first half-bridges, and the first end and the second end of the motor control circuit are respectively used to connect to the two ends of a charging pile 7, so that the charging pile 7 can directly charge or boost charge the power battery 3.

[0136] As an example, the charging control system includes a power battery 3 and the motor control circuit in the above embodiment. The two ends of the power battery 3 are respectively connected to the two ends of multiple first half-bridges. The first and second ends of the motor control circuit are respectively used to connect to the two ends of the charging pile 7. Depending on the actual situation, the first switch K1, the second switch K2, and the first motor controller 1 can be controlled to operate, so that the charging pile 7 can directly charge the power battery 3 or perform boost charging. For example, controlling the first switch K1 to be on and the second switch K2 to be off, and the first motor controller 1 to be off, allows the charging pile 7 to directly charge the power battery 3. Alternatively, controlling the first switch K1 to be off and the second switch K2 to be on, and controlling the first motor controller 1 to operate, allows the motor control circuit to boost the supply voltage of the charging pile 7, making the charging voltage across the power battery 3 greater than the supply voltage of the charging pile 7, thus achieving the purpose of boost control. When the first switch K1 is open and the second switch K2 is open, the upper bridge transistor S1 and the lower bridge transistor S2 of the first motor controller 1 are alternately controlled to work. The specific control process is as follows: (1) First, control the lower bridge transistor S2 connected to the first inductor L1 to be open so that the current output from the first end of the charging pile 7 flows through the first inductor L1 and flows back to the second end of the charging pile 7 so that the charging pile 7 charges the first inductor L1; (2) Control the upper bridge transistor S1 connected to the first inductor L1 to be open so that the current output from the first end of the charging pile 7 passes through the first inductor L1 and the power battery 3 in sequence and flows back to the second end of the charging pile 7 so that the charging pile 7 charges the power battery 3. Due to the volt-second characteristic that the current of the first inductor L1 cannot change abruptly, the first inductor L1 also charges the power battery 3, so that the charging voltage at both ends of the power battery 3 is greater than the power supply voltage of the charging pile 7, thereby realizing the boost charging function.

[0137] In one embodiment, the charging control system further includes a third switch K7, the first end of which is connected to the first end of the motor control circuit, and the second end of which is used to connect to the first end of the charging pile 7.

[0138] As an example, the charging control system also includes other circuit structures. For example, when it includes a second motor controller 2 connected to both ends of the motor control circuit, a third switch K7 is also required to ensure the normal implementation of the charging function. The first end of the third switch K7 is connected to the first end of the motor control circuit, and the second end of the third switch K7 is used to connect to the first end of the charging pile 7. When the third switch K7 is open, the charging pile 7 is not connected to the charging control system; when the third switch K7 is closed, the charging pile 7 is connected to the charging control system. The first switch K1, the second switch K2 and the first motor controller 1 can be controlled to work according to the actual situation so that the charging pile 7 can directly charge or boost charge the power battery 3.

[0139] This application provides a charging control method applicable to the motor control system described in the above embodiments, specifically applicable to a control device connected to the motor control system. This control device can be a vehicle control unit (VCU) installed in an automobile. The charging control method includes:

[0140] S31: Obtain third-party requirement data;

[0141] S32: When the third demand data meets the preset boosting conditions, control the first switch K1 to open, control the second switch K2 to turn on, and alternately control the lower bridge tube S2 and the upper bridge tube S1 connected to the first inductor L1 in the first motor controller 1 to turn on, so that the charging pile 7 can boost the charging of the power battery 3.

[0142] S33: When the third demand data does not meet the preset boost conditions, control the first switch K1 to be turned on and the second switch K2 to be turned off, so that the charging pile 7 can directly charge the power battery 3.

[0143] The third demand data reflects the charging and discharging demand between the power battery 3 and the charging pile 7. The pre-boost condition is a pre-set condition used to assess whether the discharge voltage of the charging pile 7 needs to be boosted.

[0144] As an example, the VCU is connected to the first and second terminals of the motor control circuit to the two ends of the charging pile 7, respectively. When the power battery 3 can receive charging from the charging pile 7, it needs to further obtain the third demand data through the CAN bus or other communication methods. Then, the third demand data is compared with the preset boost conditions so as to determine whether the discharge voltage of the charging pile 7 needs to be boosted based on the comparison result.

[0145] As an example, when the third demand data meets the preset boost condition, the VCU needs to control the first switch K1 to open, control the second switch K2 to open, and control the first motor controller 1 to work so that the motor control circuit can boost the charging voltage of the charging pile 7, so that the charging voltage at both ends of the power battery 3 is greater than the power supply voltage of the charging pile 7, in order to ensure the charging efficiency of the power battery 3. In this example, when the first switch K1 is open and the second switch K2 is open, the upper bridge transistor S1 and the lower bridge transistor S2 of the first motor controller 1 are alternately controlled to work. The specific control process is as follows: (1) First, control the lower bridge transistor S2 connected to the first inductor L1 to be open so that the current output from the first end of the charging pile 7 flows through the first inductor L1 and back to the second end of the charging pile 7 so that the charging pile 7 charges the first inductor L1; (2) Then control the upper bridge transistor S1 connected to the first inductor L1 to be open so that the current output from the first end of the charging pile 7 passes through the first inductor L1 and the power battery 3 in sequence and back to the second end of the charging pile 7 so that the charging pile 7 charges the power battery 3. Due to the volt-second characteristic that the current of the first inductor L1 cannot change abruptly, the first inductor L1 also charges the power battery 3, so that the charging voltage at both ends of the power battery 3 is greater than the power supply voltage of the charging pile 7, thereby realizing the boost charging function.

[0146] As an example, when the third demand data does not meet the preset boost conditions, the VCU controls the first switch K1 to be turned on and the second switch K2 to be turned off, so that the charging pile 7 can directly charge the power battery 3 to ensure the charging efficiency of the power battery 3.

[0147] In one embodiment, the third demand data includes a third voltage difference, which is the difference between the battery voltage of the power battery 3 and the highest operating voltage of the charging pile 7.

[0148] The preset boost condition is that the third voltage difference is greater than the third voltage difference threshold.

[0149] The battery voltage of power battery 3 is the battery voltage of power battery 3. For example, in an 800V high-voltage platform, the battery voltage of power battery 3 is 800V. The maximum operating voltage of charging pile 7 is the maximum voltage at which charging pile 7 discharges to the outside. For example, the maximum operating voltage of charging pile 7 can be 500V, or it can be 800V that matches the 800V high-voltage platform.

[0150] As an example, in step S31, the VCU can obtain the battery voltage of the power battery 3 and the maximum operating voltage of the charging pile 7. Then, the difference between the battery voltage of the power battery 3 and the maximum operating voltage of the charging pile 7 is determined as the third voltage difference. Next, the third voltage difference is compared with the third voltage difference threshold. If the third voltage difference is greater than the third voltage difference threshold, it is determined that the battery voltage of the power battery 3 is much higher than the maximum operating voltage of the charging pile 7. If the discharge voltage of the charging pile 7 is used to charge the power battery 3 directly, there will be a problem of low charging efficiency. Therefore, it is necessary to reduce the discharge voltage of the charging pile 7, and it can be determined that it meets the preset voltage boosting condition. Conversely, if the third voltage difference is not greater than the third voltage difference threshold, it is determined that the battery voltage of the power battery 3 matches the maximum operating voltage of the charging pile 7. The discharge voltage of the charging pile 7 is used to charge the power battery 3 directly, which can ensure its charging efficiency. Therefore, it is determined that it does not meet the preset voltage boosting condition.

[0151] In this example, when the battery voltage of the power battery 3 is 800V and the third voltage difference threshold is 100V, if the highest operating voltage of the charging pile 7 is 500V, the third voltage difference between the two is 300V, which is greater than the third voltage difference threshold. At this time, it is determined that the preset boost condition is met, and the first switch K1 can be opened and the second switch K2 can be opened to control the first motor controller 1 to work, so that the motor control circuit boosts the charging voltage of the charging pile 7, making the charging voltage of the power battery 3 greater than the supply voltage of the charging pile 7, so as to achieve the purpose of boost control. Conversely, if the highest operating voltage of the charging pile 7 is 800V, the third voltage difference between the two is 0V, which is less than the third voltage difference threshold. At this time, it is determined that the preset boost condition is not met, and the first switch K1 can be opened and the second switch K2 can be opened to allow the charging pile 7 to directly charge the power battery 3.

[0152] In one embodiment, the charging control system further includes a third switch K7, the first end of which is connected to the first end of the motor control circuit, and the second end of which is used to connect to the first end of the charging pile 7.

[0153] The charging control method also includes: controlling the third switch K7 to be turned on.

[0154] As an example, the charging control system also includes other circuit structures. For example, when it includes a second motor controller 2 connected to both ends of the motor control circuit, in order to ensure the normal implementation of the charging function, a third switch K7 is also required. The first end of the third switch K7 is connected to the first end of the motor control circuit, and the second end of the third switch K7 is used to connect to the first end of the charging pile 7. When it is necessary to control the charging pile 7 to charge the power battery 3, the third switch K7 needs to be turned on. According to the battery voltage of the power battery 3 and the highest operating voltage of the charging pile 7, the first switch K1, the second switch K2 and the first motor controller 1 are controlled to work so that the charging pile 7 can directly charge or boost charge the power battery 3.

[0155] This application provides a high-voltage system, as shown in FIG2. The high-voltage system includes the motor control circuit, the second motor controller 2, the power battery 3 and the drive motor 6 in the above embodiment.

[0156] The two ends of the power battery 3 are connected to the two ends of multiple first half-bridges;

[0157] The second motor controller 2 includes multiple second half-bridges. The first end of each of the multiple second half-bridges is connected to the first end of the motor control circuit, the second end of each of the multiple second half-bridges is connected to the second end of the motor control circuit, and the midpoint of each of the multiple second half-bridges is used to connect the motor windings of the drive motor 6.

[0158] The first and second terminals of the motor control circuit are used to connect to the two ends of the electrical load or the two ends of the charging pile 7, respectively.

[0159] In this example, the drive motor 6 is the first motor in the above embodiment. The first and second terminals of the motor control circuit are connected to the second motor controller 2, which is connected to the drive motor 6. The second motor controller 2 can execute the motor driving method in the above embodiment to enable the power battery 3 to control the drive motor 6 to work. Moreover, the first and second terminals of the motor control circuit can also be used to connect the two ends of the electrical load to enable it to implement the discharge control method in the above embodiment to replenish the electrical load. Alternatively, the first and second terminals of the motor control circuit can also be used to connect the two ends of the charging pile 7 to receive charging from the charging pile 7.

[0160] In one embodiment, the high-voltage system further includes a generator 4 and an engine 5, the engine 5 being connected to the generator 4, and the motor windings of the generator 4 being connected to a first motor controller 1.

[0161] In this example, the generator 4 can be driven to rotate by controlling the engine 5 to generate current, so that the generator 4 can supply power to the drive motor 6 together with the power battery 3, so that the drive motor 6 can work; or, the generator 4 can supply power to the electrical load together with the power battery 3, so as to replenish the power of the electrical load.

[0162] A control device includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the motor drive method in the above embodiments, or the discharge control method in the above embodiments, or the charging control method in the above embodiments. To avoid repetition, these will not be described in detail here.

[0163] An automobile includes the motor control circuit, the motor control system, the motor drive system, the discharge control system, the charging control system, the high voltage system, and the control device described in the above embodiments. To avoid repetition, each of these will not be described in detail here.

[0164] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. An electric motor control circuit, wherein, The first motor controller comprises a plurality of first half-bridges, the midpoints of the plurality of first half-bridges are used for connecting motor windings of a first motor, and the two ends of the plurality of first half-bridges are used for connecting two ends of a power battery. The first ends of the plurality of first half-bridges are connected to the first end of the first switch, and the midpoint of at least one of the first half-bridges is connected to the first end of the second switch through the first inductor. The second end of the first switch and the second end of the second switch are the first end and the second end of the motor control circuit, and the second ends of the plurality of first half-bridges are the second end of the motor control circuit. The first end and the second end of the motor control circuit are used for connecting two ends of a second motor controller, two ends of a load, or two ends of a charging pile. The first inductor is used for the motor windings.

2. The motor control circuit of claim 1, wherein, The motor control circuit further comprises a first capacitor and a second capacitor.

3. The motor control circuit of claim 1, wherein, The two ends of the first capacitor are connected to the first end and the second end of the plurality of first half-bridges. The two ends of the second capacitor are connected to the first end and the second end of the motor control circuit. The motor control circuit comprises the motor control circuit of any one of claims 1-3 and a second motor controller.

4. An electric motor control system wherein, The second motor controller comprises a plurality of second half-bridges, the first ends of the plurality of second half-bridges are connected to the first end of the motor control circuit, the second ends of the plurality of second half-bridges are connected to the second end of the motor control circuit, and the midpoints of the plurality of second half-bridges are used for connecting motor windings of a second motor. The motor control system comprises a power battery and the motor control system of claim 4.

5. An electric motor drive system wherein, The two ends of the power battery are connected to the two ends of the plurality of first half-bridges, so that the power battery directly drives or step-down drives the second motor controller to work. The motor drive system comprises a power battery, a motor control circuit, a first switch, a second switch, and a first motor controller.

6. The motor drive system of claim 5, wherein, The motor drive method comprises:

7. A method of driving an electric machine, wherein, Determining a current driving mode; According to the current driving mode, controlling the first switch, the second switch, and the first motor controller to perform target operations, so that the power source corresponding to the current driving mode drives the second motor controller to work. According to the current driving mode, controlling the first switch, the second switch, and the first motor controller to perform target operations, so that the power source corresponding to the driving mode drives the second motor controller to work, comprising:

8. The motor drive method according to claim 7, wherein When the current driving mode is a pure electric mode, obtaining first demand data; When the first demand data meets a preset decoupling condition, controlling the first switch to be turned off, controlling the second switch to be turned on, and controlling the upper bridge tube and the lower bridge tube of the first motor controller connected to the first inductor to be turned on in an interleaved manner, so that the power battery step-down drives the second motor controller to work. ​ When the first demand data does not satisfy the preset decoupling condition, the first switch is controlled to be turned on, and the second switch is controlled to be turned off, so that the power battery directly drives the second motor controller to work.

9. The motor drive method of claim 8, wherein, The first demand data comprises a first voltage difference value, which is a difference between a battery voltage of the power battery and an optimal working voltage of the second motor. The preset decoupling condition is that the first voltage difference value is greater than a first voltage difference threshold.

10. The motor drive method of claim 7, wherein, According to the current driving mode, the first switch, the second switch and the first motor controller are controlled to perform target operations, so that the power source corresponding to the current driving mode drives the second motor controller to work, which comprises: When the current driving mode is the hybrid driving mode, the first switch is controlled to be turned on, the second switch is controlled to be turned off, and the engine is controlled to work, so that the generator and the power battery directly drive the second motor controller to work.

11. A discharge control system wherein, The motor control circuit comprises the power battery and the motor control circuit according to any one of claims 1-3. The two ends of the power battery are connected to the two ends of the plurality of first half-bridges respectively, and the first end and the second end of the motor control circuit are used for connecting the two ends of the electric load respectively, so that the power battery directly charges or step-down charges the electric load.

12. The electrical discharge control system of claim 11, wherein, The discharge control system further comprises a generator and an engine, the engine is connected to the generator, and the motor winding of the generator is connected to the first motor controller, so that the generator and the power battery directly charge the electric load.

13. A discharge control method in which, The discharge control method is applicable to the discharge control system according to any one of claims 11-12, and the discharge control method comprises: obtaining second demand data; When the second demand data satisfies a preset step-down condition, the first switch is controlled to be turned off, the second switch is controlled to be turned on, and the upper bridge tube and the lower bridge tube connected to the first inductor in the first motor controller are controlled to be turned on in an interleaved manner, so that the power battery step-down charges the electric load; When the second demand data does not satisfy the preset step-down condition, the first switch is controlled to be turned on, and the second switch is controlled to be turned off, so that the power battery directly charges the electric load.

14. The discharge control method according to claim 13, wherein The second demand data comprises a second voltage difference value, which is a difference between the battery voltage of the power battery and a demand voltage of the electric load. The preset step-down condition is that the second voltage difference value is greater than a second voltage difference threshold.

15. The discharge control method according to claim 13, wherein Before the second demand data is obtained, the discharge control method further comprises: obtaining a current power of the power battery; If the current power of the power battery is less than a preset power, the first switch is controlled to be turned on, the second switch is controlled to be turned of, and the engine is controlled to work, so that the generator and the power battery directly charge the electric load; If the current power of the power battery is not less than the preset power, the second demand data is obtained.

16. A charge control system, wherein, The motor control circuit comprises the power battery and the motor control circuit according to any one of claim 1-3. The two ends of the power battery are connected with the two ends of the plurality of first half-bridges respectively, and the first end and the second end of the motor control circuit are used for connecting the two ends of the charging pile respectively, so that the charging pile directly charges or boosts charges the power battery.

17. The charge control system of claim 16, wherein, The charging control system further comprises a third switch, a first end of the third switch is connected with the first end of the motor control circuit, and a second end of the third switch is used for connecting a first end of the charging pile.

18. A charge control method in which, The charging control method is applicable to the charging control system of any one of claims 16-17, and the charging control method comprises: obtaining third demand data; when the third demand data meets a preset boosting condition, controlling the first switch to be turned off, controlling the second switch to be turned on, and controlling the lower bridge tube and the upper bridge tube connected with the first inductor in the first motor controller to be turned on in an interleaved manner, so that the charging pile boosts charges the power battery; when the third demand data does not meet the preset boosting condition, controlling the first switch to be turned on and the second switch to be turned off, so that the charging pile directly charges the power battery.

19. The charge control method according to claim 18, wherein, The third demand data comprises a third voltage difference value, and the third voltage difference value is a difference between a battery voltage of the power battery and a highest working voltage of the charging pile. The preset boosting condition is that the third voltage difference value is greater than a third voltage difference threshold.

20. The charging control method according to claim 18, wherein The charging control system further comprises a third switch, a first end of the third switch is connected with the first end of the motor control circuit, and a second end of the third switch is used for connecting a first end of the charging pile. The charging control method further comprises: controlling the third switch to be turned on.

21. A high voltage system, wherein, The motor control circuit, the second motor controller, the power battery and the driving motor of any one of claims 1-3; The two ends of the power battery are connected with the two ends of the plurality of first half-bridges respectively; The second motor controller comprises a plurality of second half-bridges, a first end of each of the plurality of second half-bridges is connected with the first end of the motor control circuit, a second end of each of the plurality of second half-bridges is connected with the second end of the motor control circuit, and a midpoint of each of the plurality of second half-bridges is used for connecting a motor winding of the driving motor. The first end and the second end of the motor control circuit are used for connecting two ends of a power load or two ends of a charging pile respectively.

22. The high pressure system of claim 21, wherein, The high-voltage system further comprises a generator and an engine, the engine is connected with the generator, and a motor winding of the generator is connected with the first motor controller.

23. A control device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein, The processor executes the computer program to implement the motor driving method of any one of claims 7-10, or to implement the discharging control method of any one of claims 13-15, or to implement the charging control method of any one of claims 18-20.

24. An automobile, wherein, The motor control circuit of any one of claims 1-3, the motor control system of claim 4, the motor driving system of any one of claims 5-6, the discharging control system of any one of claims 11-12, the charging control system of any one of claims 16-17, the high-voltage system of any one of claims 21-22, or the control device of claim 23.

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