Motor control circuit, motor control system, motor driving system, discharging control system, charging control system, high-voltage system and automobile

Abstract

The utility model discloses a motor control circuit, a motor control system, a motor driving system, a discharging control system, a charging control system, a high-voltage system and an automobile. The motor control circuit comprises a first motor controller, a first inductor, a first switch and a second switch; the first motor controller comprises a plurality of first half bridges, the middle points of the plurality of first half bridges are used for connecting a 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; the first ends of the plurality of first half bridges are connected with the first end of the first switch, and the midpoint of at least one first half bridge is connected with 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 of the motor control circuit, and the second end of the first half-bridge is the second end of the motor control circuit and used for being connected with the two ends of a second motor controller, the two ends of an electricity utilization load or the two ends of a charging pile respectively.

Description

TECHNICAL FIELD

[0001] The utility model relates to new energy automobile technical field especially, and it relates to a motor control circuit, motor control system, motor drive system, discharge control system, charging control system, high pressure system and car. BACKGROUND

[0002] 800V high voltage platform of new energy automobile is the mainstream choice to solve the problem of range anxiety and slow charging, in 800V high voltage platform, high power fast charging can be realized by increasing current or increasing voltage, but high current will cause high heat loss of charging gun, cable and power battery core components, and its 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, the battery voltage of the power battery is increased from 400V to 800V, the charging power will be greatly improved, so that the charging time of the power battery will be greatly shortened, and the charging energy experience of the power battery will be close to the refueling of the fuel vehicle. In the existing new energy automobile, voltage conversion equipment needs to be increased to enable the 800V power battery to meet different charging and discharging requirements, and this way of increasing voltage conversion equipment has the problems of high cost and large space occupation. SUMMARY

[0003] The utility model embodiment provides a motor control circuit, motor control system, motor drive system, discharge control system, charging control system, high pressure system and car to solve the problem of high cost and large space occupation of the way of increasing voltage conversion equipment.

[0004] A motor control circuit, comprising a first motor controller, a first inductor, a first switch and a second switch;

[0005] 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;

[0006] 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 first half bridge are connected to the first end of the second switch through the first inductor;

[0007] 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 ends of the plurality of first half bridges are the second end of the motor control circuit;

[0008] 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.

[0009] Preferably, the first inductor is the motor winding.

[0010] Preferably, the motor control circuit further comprises a first capacitor and a second capacitor.

[0011] Two ends of the first capacitor are connected to the first end and the second end of each of the plurality of first half-bridges, respectively.

[0012] Two ends of the second capacitor are connected to the first end and the second end of the motor control circuit, respectively.

[0013] A motor control system comprising the above motor control circuit and a second motor controller.

[0014] 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 to connect the motor winding of the second motor.

[0015] A motor drive system comprising a power battery and the above motor control system.

[0016] Two ends of the power battery are connected to 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.

[0017] Preferably, the motor drive 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 drive the second motor controller to work.

[0018] A discharge control system comprising a power battery and the above motor control circuit.

[0019] Two ends of the power battery are connected to 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 to connect two ends of an electrical load, so that the power battery directly charges or step-down charges the electrical load.

[0020] Preferably, 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 electrical load.

[0021] A charge control system comprising a power battery and the above motor control circuit.

[0022] 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 a charging pile respectively, so that the charging pile performs direct charging or step-up charging on the power battery.

[0023] Preferably, 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 a charging pile.

[0024] A high-voltage system comprising the motor control circuit, the second motor controller, the power battery and the drive motor.

[0025] The two ends of the power battery are connected with the two ends of the plurality of first half-bridges respectively.

[0026] The second motor controller comprises a plurality of second half-bridges, a first end of the plurality of second half-bridges is connected with the first end of the motor control circuit, a second end of the plurality of second half-bridges is connected with the second end of the motor control circuit, and a midpoint of the plurality of second half-bridges is used for connecting motor windings of the drive motor.

[0027] The first end and the second end of the motor control circuit are used for connecting two ends of an electrical load or two ends of a charging pile respectively.

[0028] Preferably, the high-voltage system further comprises a generator and an engine, the engine is connected with the generator, and motor windings of the generator are connected with the first motor controller.

[0029] A control device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, when the processor executes the computer program, the motor drive method, the discharge control method or the charging control method is implemented.

[0030] An automobile comprising the motor control circuit, the motor control system, the motor drive system, the discharge control system, the charging control system, the high-voltage system or the control device.

[0031] The motor control circuit, the motor control system, the motor driving system, the discharging control system, the charging control system, the high-voltage system and the automobile, the motor control circuit multiplexes the first half-bridge in the first motor controller, increases 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 for connecting the two ends of the second motor controller, the two ends of the charging pile or the two ends of the electric load, so that the voltage is boosted or reduced according to the actual situation, so as to meet different requirements. BRIEF DESCRIPTION OF DRAWINGS

[0032] In order to more clearly illustrate the technical scheme in 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 be obtained by those skilled in the art without creative labor.

[0033] Figure 1 is a circuit schematic diagram of a motor control circuit in an embodiment of the present application;

[0034] Figure 2 is a circuit schematic diagram of a high-voltage system in an embodiment of the present application.

[0035] 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 driving motor; 7, the charging pile. DETAILED DESCRIPTION

[0036] The technical scheme in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0037] It is to be understood that the present application can be carried out by different embodiments and that the embodiment presented herein is by way of example only and should not be construed to limit the scope of the present application. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the present application to those skilled in the art. In the drawings, like reference numerals refer to like elements throughout the several views, and the size and relative sizes of layers and regions can be exaggerated in some of the drawings for clarity.

[0038] It will be understood that when an element or layer is referred to as being "on" or "connected to" another element or layer, it can be directly on or connected to the other element or layer or intervening elements or layers can be present. In contrast, when an element is referred to as being "directly on" or "directly connected to" another element or layer, there are no intervening elements or layers present. It will also be understood that, although the terms 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 only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the present application.

[0039] 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 the 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.

[0040] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising", when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0041] For a thorough understanding of the present application, reference will be made to the following detailed description, in conjunction with the accompanying drawings, in which:

[0042] The motor control circuit provided by the embodiment of the present application comprises a first motor controller 1, a first inductor L1, a first switch K1 and a second switch K2. Figure 1 The first motor controller 1 comprises a plurality of first half-bridges, the midpoints of the plurality of first half-bridges are used for connecting motor windings of the first motor, and the two ends of the plurality of first half-bridges are used for connecting two ends of a power battery 3; the first ends of the plurality of first half-bridges are connected with the first end of the first switch K1, and the midpoints of at least one first half-bridge are 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 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 respectively used for connecting two ends of a second motor controller 2, two ends of a load or two ends of a charging pile 7.

[0043] In the present example, the first motor can drive a motor, and can also be a generator 4. The power battery 3 in the present example can be a 400V power battery, or can be an 800V power battery, and is preferably an 800V power battery.

[0044] As an example, the motor control circuit multiplexes the first motor controller 1, further comprising a first inductor L1, a first switch K1 and a second switch K2, the first ends of the plurality of 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; the midpoint of at least one 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 plurality of first half-bridges are the second end of the motor control circuit. In this example, the first end and the second end of the motor control circuit are used to connect the two ends of the second motor controller 2, the two ends of the load or the two ends of the charging pile 7.

[0045] In this example, the first end and the second end of the motor control circuit can be connected to the second motor controller 2, and the midpoints of the plurality of second half-bridges of the second motor controller 2 are used to connect the motor windings of the second motor. According to actual conditions, the first switch K1, the second switch K2 and the first motor controller 1 can be controlled to work to ensure that the second motor is at the optimal working voltage point. For example, when the battery voltage of the power battery 3 matches the optimal working voltage of the second motor, the first switch K1 can be controlled to be turned on, the second switch K2 can be controlled to be turned off, and the first motor controller 1 can be controlled not to work, so that the power battery 3 directly supplies power to the second motor controller 2. When the battery voltage of the power battery 3 does not match the optimal working voltage of the second motor, specifically when the battery voltage of the power battery 3 is greater than the optimal working voltage of the second motor, the first switch K1 can be controlled to be turned off, and the second switch K2 can be controlled to be turned on, so that the battery voltage of the power battery 3 is decoupled from the working voltage of the second motor. The first motor controller 1 can be controlled to work and be adjusted to the optimal working voltage of the second motor to ensure efficient work of the second motor. In this 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 interleaved manner, and the specific control process is as follows: (1) the upper bridge tube S1 connected to the first inductor L1 is controlled to be turned on first, so that the current output from the positive electrode of the power battery 3 flows through the first inductor L1 and the second motor controller 2 in turn and returns to the negative electrode 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 battery voltage of the power battery 3 is adjusted to the optimal working voltage of the second motor to ensure efficient work of the second motor; (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 second motor controller 2 to form a return current to complete the voltage reduction adjustment process with the power battery 3. In this example, two voltages match means that the voltage difference between the two voltages is less than a preset threshold, and two voltages do not match means that the voltage difference between the two voltages is not less than the preset threshold.

[0046] 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 turn, 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 changed suddenly, 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.

[0047] In this example, the first end and the second end of the motor control circuit can be connected to the charging pile 7. The first switch K1, the second switch K2 and the first motor controller 1 can be controlled to work according to actual conditions, so that the charging pile 7 directly charges or boosts the power battery 3. For example, when the battery voltage of the power battery 3 matches the highest working voltage of the charging pile 7, 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 not controlled to work, so that the charging pile 7 directly charges the power battery 3. When the battery voltage of the power battery 3 is higher than the highest working voltage of the charging pile 7, for example, when the battery voltage of the power battery 3 is 800V and the highest working voltage of the charging pile 7 is 500V, the first switch K1 is controlled to be turned off, the second switch K2 is controlled to be turned on, and the first motor controller 1 is controlled to work, so that the motor control circuit boosts the charging voltage of the charging pile 7, so that the charging voltage between the power battery 3 is greater than the supply voltage of the charging pile 7, so as to achieve the purpose of boosting control. In this 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 interleaved manner, and the specific control process is as follows: (1) the lower bridge tube S2 connected to the first inductor L1 is controlled to be turned on, so that the current output by the first end of the charging pile 7 flows through the first inductor L1 and returns to the second end of the charging pile 7, so that the charging pile 7 charges the first inductor L1; (2) the upper bridge tube S1 connected to the first inductor L1 is controlled to be turned on, so that the current output by the first end of the charging pile 7 flows through the first inductor L1 and the power battery 3 in turn and returns to the second end of the charging pile 7, so that the charging pile 7 charges the power battery 3. Due to the current cannot be abruptly changed volt-second characteristic of the first inductor L1, the first inductor L1 also charges the power battery 3, so that the charging voltage between the power battery 3 is greater than the supply voltage of the charging pile 7, thereby realizing the function of boosting charging.

[0048] In this example, the motor control circuit multiplexes the first half-bridge in the first motor controller 1, adds the first inductor L1, the first switch K1 and the second switch K2, the first ends and the second ends of the plurality of first half-bridges are connected to the two ends of the power battery 3, 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 2, the two ends of the load or the two ends of the charging pile 7, so as to boost or step down according to actual conditions, so as to meet different needs. Moreover, the whole circuit structure multiplexes the first half-bridge, and different functions can be realized by adding inductors and switches. The whole circuit structure is simple, small in size and low in cost, and can meet different charging and discharging needs.

[0049] In an embodiment, the first inductor L1 is a motor winding.

[0050] As an example, the first inductor L1 can be a motor winding in the first motor, and in this example, the motor winding of the first motor connected with the first switch K2 connected with the midpoint of the plurality of first half bridges can determine at least one motor winding as the first inductor L1, which can further reduce the number of elements in the circuit, so that it is smaller in size and lower in cost.

[0051] In an embodiment, the motor control circuit further comprises a first capacitor C1 and a second capacitor C2; two ends of the first capacitor C1 are connected with the first end and the second end of the plurality of first half bridges respectively; two ends of the second capacitor C2 are connected with the first end and the second end of the motor control circuit respectively.

[0052] As an example, the motor control circuit further comprises a first capacitor C1 and a second capacitor C2. Two ends of the first capacitor C1 are connected with the first end and the second end of the plurality of first half bridges respectively, and since the first end and the second end of the plurality of first half bridges are used to be connected with two ends of the power battery 3 respectively, the first capacitor C1 can perform voltage stabilizing processing on the input voltage or output voltage of the power battery 3 to avoid voltage fluctuation affecting the normal work of the entire circuit. Two ends of the second capacitor C2 are connected with the first end and the second end of the motor control circuit respectively, and the first end and the second end of the motor control circuit are used to be connected with two ends of the second motor controller 2, two ends of the load or two ends of the charging pile 7, so that the second capacitor C2 can perform voltage stabilizing processing on the input voltage or output voltage of the motor control circuit to avoid voltage fluctuation affecting the normal work of the entire circuit.

[0053] When the power battery 3 is an 800V power battery, if the motor is directly driven by the power battery 3 to work, since the working voltage of the motor is coupled with the battery voltage of the power battery 3, the motor works at 800V voltage, and in the high-voltage state, there are some motor working condition efficiency points that are low, therefore, the battery voltage of the power battery 3 needs to be reduced to improve the motor efficiency.

[0054] The motor control system provided by the embodiment of the utility model, comprising the motor control circuit in above -mentioned embodiment, still include second motor controller 2, second motor controller 2 includes a plurality of second half bridges, the first end of a plurality of second half bridges is connected with the first end of motor control circuit, the second end of a plurality of second half bridges is connected with the second end of motor control circuit, and the midpoint of a plurality of second half bridges is used to connect the motor winding of second motor.

[0055] The second motor controller 2 is an inverter of the second motor, and includes a plurality of second half-bridges. Each second half-bridge includes an upper bridge tube S1 and a lower bridge tube S2 connected in series, and a connection node between the upper bridge tube S1 and the lower bridge tube S2 is a midpoint of the second half-bridge. The midpoint of each second half-bridge is used to connect a motor winding of the second motor. First ends and second ends of the plurality of second half-bridges are connected to first and second ends of the motor control circuit, respectively. The second motor controller 2 can perform inverting processing on direct current output by the power battery 3 directly or after being processed by the motor control circuit, so as to drive the second motor to work.

[0056] As an example, the motor control system includes the motor control circuit and the second motor controller 2 in the above embodiment. The motor control circuit includes the first motor controller 1, the first inductor L1, the first switch K1, and the second switch K2. Two ends of the plurality of first half-bridges are connected to two ends of the power battery 3. The first ends of the plurality of first half-bridges are connected to the first ends of the plurality of second half-bridges through the first switch K1. The midpoints of the plurality of first half-bridges are connected to the first ends of the plurality of second half-bridges through the first inductor L1 and the second switch K2. The second ends of the plurality of first half-bridges are connected to the second ends of the plurality of second half-bridges. That is, 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. According to actual conditions, the first switch K1, the second switch K2, and the first motor controller 1 can be controlled to work, so as to ensure that the second motor is at an optimal working voltage point.

[0057] For example, when the battery voltage of the power battery 3 matches the optimal working voltage of the second motor, the first switch K1 can be controlled to be turned on, the second switch K2 can be controlled to be turned off, and the first motor controller 1 can be controlled not to work. In this way, the power battery 3 can directly supply power to the second motor controller 2, so as to ensure efficient work of the second motor connected to the second motor controller 2.

[0058] For example, when the battery voltage of the power battery 3 does not match the optimal working voltage of the second motor, specifically, when the battery voltage of the power battery 3 is greater than the optimal working voltage of the second motor, the first switch K1 can be controlled to be turned off and the second switch K2 can be controlled to be turned on, so that the battery voltage of the power battery 3 is decoupled from the working voltage of the second motor, the first motor controller 1 is controlled to work, and the voltage across the second motor is adjusted to the optimal working voltage of the second motor, so as to ensure the high-efficiency working of the second motor. 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 interleaving, and the specific control process is as follows: (1) the upper bridge tube S1 connected with the first inductor L1 is controlled to be turned on, so that the current output by the positive electrode of the power battery 3 flows through the first inductor L1 and the second motor controller 2 in turn and returns to the negative electrode 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 adjust the voltage across the second motor to the optimal working voltage of the second motor, so as to ensure the high-efficiency working of the second motor; (2) the lower bridge tube S2 connected with the first inductor L1 is controlled to be turned on, and since the current of the first inductor L1 cannot be suddenly changed, the current of the first inductor L1 flows through the second motor controller 2 to form a return current, so as to complete the voltage reduction adjustment process together with the power battery 3.

[0059] The motor driving system provided by the embodiment of the utility model includes the power battery 3 and the motor control system in the above embodiment, the two ends of the power battery 3 are connected with the two ends of the plurality of first half bridges in the first motor controller 1, the first ends of the plurality of first half bridges are connected with the first ends of the plurality of second half bridges through the first switch K1, the midpoint of at least one first half bridge is connected with the first ends of the plurality of second half bridges through the first inductor L1 and the second switch K2, and the second ends of the plurality of first half bridges are connected with the second ends of the plurality of second half bridges.

[0060] As an example, the motor driving system includes the power battery 3 and the motor control system in the above embodiment, the two ends of the power battery 3 are connected with the two ends of the plurality of first half bridges in the first motor controller 1, the first ends of the plurality of first half bridges are connected with the first ends of the plurality of second half bridges through the first switch K1, the midpoint of at least one first half bridge is connected with the first ends of the plurality of second half bridges through the first inductor L1 and the second switch K2, and the second ends of the plurality of first half bridges are connected with the second ends of the plurality of second half bridges. That is, the power battery 3 is connected with the second motor controller 2 through the motor control circuit, the second motor controller 2 is connected with the second motor, and the first switch K1, the second switch K2 and the first motor controller 1 can be controlled to work according to actual conditions, so as to ensure that the second motor is at the optimal working voltage point.

[0061] In the example, when the battery voltage of the power battery 3 matches the optimal working voltage of the second motor, for example, when the battery voltage of the power battery 3 is 800 V and the optimal working voltage of the second motor is 800 V, 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 not controlled to work, so that the power battery 3 directly drives the second motor controller 2 to work, and then drives the second motor to work. When the battery voltage of the power battery 3 does not match the optimal working voltage of the second motor, specifically, when the battery voltage of the power battery 3 is higher than the optimal working voltage of the second motor, for example, when the battery voltage of the power battery 3 is 800 V and the optimal working voltage of the second motor is 400 V, the first switch K1 is controlled to be turned off, the second switch K2 is controlled to be turned on, and the first motor controller 1 is controlled to work, so that the battery voltage of the power battery 3 is stepped down, the voltage across the second motor is adjusted to the optimal working voltage of the second motor, and the power battery 3 drives the second motor controller 2 to work in a stepped-down manner, and then drives the second motor to work, so as to ensure efficient working of the second motor. 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 interleaved manner, so that the battery voltage of the power battery 3 is stepped down and adjusted to the optimal working voltage of the second motor, and efficient working of the second motor is ensured.

[0062] In an embodiment, the motor driving system further comprises a generator 4 and an engine 5, the engine 5 is connected with the generator 4, and the motor winding of the generator 4 is connected with the first motor controller 1, so that the generator 4 drives the second motor controller 2 to work directly with the power battery 3.

[0063] As an example, the motor driving system further comprises a generator 4 and an engine 5, the engine 5 is connected with the generator 4, and the motor winding of the generator 4 is connected with the first motor controller 1, so that the generator 4 drives the second motor controller 2 to work directly with the power battery 3. In the example, when the first switch K1 is turned on and the second switch K2 is turned on, if the engine 5 does not work, the power battery 3 directly drives the second motor to work, so as to enter a pure electric mode; if the engine 5 drives the generator 4 to work, the generator 4 drives the second motor controller 2 to work directly with the power battery 3, at this time, the generator 4 and the power battery 3 together drive the second motor to work, so as to enter a hybrid power mode.

[0064] The motor driving method provided in the embodiment of the utility model is applicable in the motor control system in the above-mentioned embodiments, and is particularly applicable in a control device connected with the motor control system. The control device can be a vehicle control unit (VCU) arranged on a vehicle. The motor driving method comprises the following steps:

[0065] S11: determine a current driving mode;

[0066] S12: according to the current driving mode, control the first switch K1, the second switch K2 and the first motor controller to perform a target operation, so that the power source corresponding to the current driving mode drives the second motor controller 2 to work.

[0067] Among them, the current driving mode is the driving mode at the current moment, as an example, the current driving mode can be any one of the hybrid mode and the pure electric mode, the hybrid mode refers to the mode of having other power sources in addition to the power battery 3; the pure electric mode is the mode of using only the power battery 3 as the power source.

[0068] As an example, the VCU can determine the current driving mode through the CAN bus or other ways, then call the control strategy corresponding to the current driving mode, control the first switch K1, the second switch K2 and the first motor controller 1 to perform the target operation, that is, control the first switch K1 to open or close, control the second switch K2 to open or close, control the switch tube in the first motor controller 1 to open or close, so that the power source corresponding to the current driving mode drives the second motor controller 2 to work, so that the second motor controller 2 controls the second motor to work. In the example, when the current driving mode is the hybrid mode, the power battery 3 and other power sources need to be controlled to drive the second motor controller 2 to work together; when the current driving mode is the pure electric mode, the power battery 3 needs to be controlled to drive the second motor controller 2 to work alone.

[0069] In an embodiment, step S12, that is, according to the current driving mode, control the first switch K1, the second switch K2 and the first motor controller to perform a target operation, so that the power source corresponding to the current driving mode drives the second motor controller 2 to work, includes:

[0070] S121: when the current driving mode is the pure electric mode, obtain first demand data;

[0071] S122: when the first demand data meets the preset decoupling condition, control the first switch K1 to be disconnected, control the second switch K2 to be turned on, and control the upper bridge tube S1 and the lower bridge tube S2 connected with the first inductor L1 in the first motor controller 1 to be turned on in staggered control, so that the power battery 3 drives the second motor controller 2 to work in step-down mode;

[0072] S123: when the first demand data does not meet the preset decoupling condition, control the first switch K1 to be turned on, control the second switch K2 to be disconnected, so that the power battery 3 directly drives the second motor controller 2 to work.

[0073] Among them, the first demand data is data for reflecting the charging and discharging demand between the power battery 3 and the second motor. The preset decoupling condition is a condition for decoupling relationship set in advance.

[0074] As an example, when the current driving mode of the VCU is the pure electric mode, the VCU further acquires the first demand data through the CAN bus or other communication methods, and then compares the first demand data with the preset decoupling condition, so as to control the first switch K1, the second switch K2 and the first motor controller 1 to perform the target operation according to the comparison result.

[0075] As an example, when the first demand data meets the preset decoupling condition, the VCU can decouple the coupling relationship between the battery voltage of the power battery 3 and the working voltage of the second motor, so that the working 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 controlled to be turned off, the second switch K2 can be controlled to be turned on, and the upper bridge S1 and the lower bridge S2 connected to the first inductor L1 in the first motor controller 1 can be controlled to be turned on in an interleaved manner, so as to step down the battery voltage of the power battery 3 to the optimal working voltage of the second motor, so as to achieve the purpose of step-down driving and protect the high-efficiency operation of the second motor.

[0076] In this example, the first switch K1 is controlled to be turned off, the second switch K2 is controlled to be turned on, and the upper bridge S1 and the lower bridge S2 connected to the first inductor L1 in the first motor controller 1 are controlled to be turned on in an interleaved manner. The specific control process is as follows: (1) The upper bridge S1 connected to the first inductor L1 is first 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 second motor controller 2 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 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 step down the battery voltage of the power battery 3 to the optimal working voltage of the second motor, so as to protect the high-efficiency operation of the second motor; (2) The lower bridge S2 connected to the first inductor L1 is controlled to be turned on. Since the current of the first inductor L1 cannot be abruptly changed, the current of the first inductor L1 flows through the second motor controller 2 to form a return current, so as to complete the step-down adjustment process together with the power battery 3.

[0077] In an embodiment, the first demand data includes a first voltage difference, and the first voltage difference is the difference between the battery voltage of the power battery 3 and the optimal working voltage of the second motor; and the preset decoupling condition is that the first voltage difference is greater than a first voltage difference threshold.

[0078] The battery voltage of the power battery 3 is the battery voltage of the power battery 3, for example, the battery voltage of the power battery 3 is 800V. The optimal working voltage of the second motor refers to the working voltage of the second motor in the highest efficiency state. The first voltage difference threshold is a threshold value preset for evaluating whether the first voltage difference reaches the large voltage difference standard.

[0079] As an example, the VCU needs to obtain the battery voltage of the power battery 3 and the optimal working voltage of the second motor. Then, the difference between the battery voltage of the power battery 3 and the optimal working voltage of the second motor is determined as the first voltage difference. Then, the first voltage difference is compared with the first pressure difference threshold value; if the first voltage difference is greater than the first pressure difference threshold value, it is determined that the battery voltage of the power battery 3 is much higher than the optimal working voltage of the second motor, for example, the battery voltage of the power battery 3 is 800V, and the optimal working voltage of the second motor is 400V, the first pressure difference difference between the two is large, at this time, the first switch K1 can be controlled to be turned off, the second switch K2 is turned on, and the first motor controller 1 is controlled to be subjected to voltage reduction processing, so that the battery voltage of the power battery 3 and the working voltage of the second motor are decoupled, and the voltage is adjusted to the optimal working voltage of the second motor, so as to guarantee the efficient working of the second motor; on the contrary, if the first voltage difference is not greater than the first pressure difference threshold value, it is determined that the battery voltage of the power battery matches the optimal working voltage of the second motor, at this time, the first switch K1 can be controlled to be turned on, and the second switch K2 is controlled to be turned off, so that the power battery 3 directly drives the second motor controller 2 to work.

[0080] In an embodiment, according to the current driving mode, the first switch K1, the second switch K2 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 2 to work, which includes:

[0081] When the current driving mode is the hybrid driving mode, the first switch K1 is controlled to be turned on, the second switch K2 is controlled to be turned off, and the engine 5 is controlled to work, so that the generator 4 and the power battery 3 drive the second motor controller 2 to work.

[0082] As an example, when the motor driving system includes the generator 4 and the engine 5, the engine 5 is connected with the generator 4, and the motor winding of the generator 4 is connected with the first motor controller 1, the VCU needs to control the first switch K1 to be turned on, the second switch K2 to be turned off, and the engine 5 to work when it is determined that the current driving mode is the hybrid driving mode, so that the engine 5 drives the generator 4 to rotate, so that the motor winding of the generator 4 generates current, and the current generated by the generator 4 and the current output by the power battery 3 are transmitted to the second motor controller 2 through the first switch K1, and the second motor controller 2 inverts the received current to drive the second motor to work, so as to realize the hybrid effect.

[0083] When the power battery 3 is an 800V power battery, the power battery 3 can be connected across the two ends of the electrical load through the motor control circuit to enable the power battery 3 to charge the electrical load, and in this process, if the electrical load is directly powered, the electrical load can be damaged due to the battery voltage of the power battery 3 being much higher than the required voltage of the electrical load, and therefore, the battery voltage of the power battery 3 needs to be stepped down to ensure the safety of the power battery 3 charging the electrical load.

[0084] The embodiment of the utility model provides a kind of discharge control system, including power battery 3 and the motor control circuit in above-mentioned embodiment;The two ends of power battery 3 are connected with the two ends of a plurality of first half-bridge respectively, and the first end and the second end of motor control circuit are used to connect the two ends of electrical load respectively, to enable power battery 3 to be directly connected to charge or step-down charge electrical load.

[0085] As an example, the discharge control system includes power battery 3 and the motor control circuit in above-mentioned embodiment, the two ends of power battery 3 are connected with the two ends of a plurality of first half-bridge respectively, and the first end and the second end of motor control circuit are used to connect the two ends of electrical load respectively, can be according to actual situation, control first switch K1, second switch K2 and first motor controller 1 work, to realize to directly connect charge or step-down charge electrical load.For example, control first switch K1 conduction, second switch K2 is disconnected, and first motor controller 1 does not work, to enable power battery 3 to directly power electrical load. Or, can control first switch K1 is disconnected, and second switch K2 is conducted, control first motor controller 1 work, step-down charge electrical load, and specific control process is as follows: (1) first control the upper bridge pipe S1 connected with first inductor L1 conduction, to enable the current output by the positive pole of power battery 3 to flow through first inductor L1 and electrical load in turn, and return to the negative pole of power battery 3, so that power battery 3 charges first inductor L1 and electrical load, since first inductor L1 and electrical load are connected in series, the voltage across the two ends of electrical load is less than the battery voltage of power battery 3, to achieve the purpose of step-down charging;(2) control the lower bridge pipe S2 connected with first inductor L1 conduction, since the current of first inductor L1 cannot be changed abruptly, the current of first inductor L1 flows through electrical load to form a return flow, to cooperate with power battery 3 to complete the purpose of step-down charging electrical load. The electrical load here can be the power battery 3 of other vehicles, or other loads.

[0086] In an embodiment, the discharge control system further includes a generator 4 and an engine 5, the engine 5 is connected with the generator 4, and the motor winding of the generator 4 is connected with the first motor controller 1, to enable the generator and the power battery 3 to directly charge the electrical load.

[0087] As an example, the discharge control system further comprises a generator 4 and an engine 5 connected to the generator 4, the engine 5 is connected to the first motor controller 1, the engine 5 generates electricity by driving the generator 4 to rotate, and the current generated by the generator 4 is output to the power load to charge the power load. In the example, when the first switch K1 is turned on and the second switch K2 is turned on; if the engine 5 does not work, the power battery 3 charges the power load; if the engine 5 drives the generator 4 to work, the generator 4 and the power battery 3 together charge the power load.

[0088] The embodiment of the utility model provides a kind of discharge control method, it is applicable in the motor control system of above-mentioned embodiment, specifically applicable in the control device connected with motor control system, the control device here can be the vehicle controller (Vehicle Control Unit, hereinafter referred to as VCU) being set on car, motor drive method includes:

[0089] S21: obtain second demand data;

[0090] S22: when second demand data meets preset voltage reduction condition, control first switch K1 is disconnected, control second switch K2 is turned on, the upper bridge pipe S1 and the lower bridge pipe S2 connected with first inductor L1 in first motor controller 1 are turned on by interlaced control, to make power battery 3 voltage reduction charging power load;

[0091] S23: when second demand data does not meet preset voltage reduction condition, control first switch K1 is turned on, second switch K2 is disconnected, to make power battery 3 direct connection charging power load.

[0092] Second demand data is data for reflecting the charge-discharge demand between power battery 3 and power load. The preset voltage reduction condition is a condition for evaluating whether the discharge voltage of power battery 3 needs to be reduced.

[0093] As an example, VCU is connected with two ends of power load at first end and second end of motor control circuit, when power load needs to be discharged, second demand data needs to be further obtained by CAN bus or other communication methods, then, second demand data is compared with preset voltage reduction condition, to determine the discharge mode of power load according to comparison result.

[0094] As an example, when the second demand data meets the preset voltage reduction condition, the VCU can control the first switch K1 to be turned off and the second switch K2 to be turned on, and 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 be turned on in an interleaved manner, so that the power battery 3 charges the power load in a voltage reduction mode. The specific control process is as follows: (1) first control the upper bridge tube S1 connected to the first inductor L1 to be turned on, so that the current output by the positive electrode of the power battery 3 flows through the first inductor L1 and the power load in turn and returns to the negative electrode of the power battery 3, so that the power battery 3 charges the first inductor L1 and the power load. Since the first inductor L1 and the power load are connected in series, the voltage across the power load is less than the battery voltage of the power battery 3, so as to achieve the effect of voltage reduction charging and ensure the charging efficiency of the power load; (2) control the lower bridge tube S2 connected to the first inductor L1 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 power load to form a return flow, so as to complete the voltage reduction adjustment process together with the power battery 3.

[0095] As an example, when the second demand data does not meet the preset voltage reduction condition, 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 charges the power load in a direct connection mode, so as to ensure the charging efficiency of the power load.

[0096] In an embodiment, the second demand data includes a second voltage difference value, which is the difference between the battery voltage of the power battery 3 and the demand voltage of the power load.

[0097] The preset voltage reduction condition is that the second voltage difference value is greater than a second voltage difference threshold.

[0098] The battery voltage of the power battery 3 is the battery voltage of the power battery 3, for example, the battery voltage of the power battery 3 is 800V. The demand voltage of the power load is the voltage required by the power load, which is the voltage required for the power load to work normally. For example, when the power load is the power battery 3 of another vehicle, if the other vehicle adopts an 800V architecture, the demand voltage of the power load is 800V or a voltage close to 800V; if the other vehicle adopts a 400V architecture, the demand voltage of the power load is 400V or a voltage close to 400V. The second voltage difference threshold is a threshold value preset for evaluating whether the second voltage difference value reaches a large voltage difference standard.

[0099] As an example, the VCU can acquire the battery voltage of the power battery 3 and the required voltage of the power-consuming load; then, a difference between the battery voltage of the power battery 3 and the required voltage of the power-consuming load is determined as a second voltage difference; then, the second voltage difference is compared 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 power-consuming load, and if the power-consuming load is directly charged, the normal work of the power-consuming load will be affected, and therefore, the battery voltage of the power battery 3 needs to be stepped down, which can be determined to meet the preset voltage step-down condition; otherwise, 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 power-consuming load, and the power-consuming load can be directly charged to ensure the charging efficiency of the power-consuming load.

[0100] In an embodiment, before step S21, i.e., before acquiring the second required data, the discharging control method further includes:

[0101] acquiring the current power of the power battery 3;

[0102] if the current power of the power battery 3 is less than a preset power, the first switch K1 is controlled to be turned on, the second switch K2 is controlled to be turned off, and the engine 5 is controlled to work so that the generator 4 and the power battery 3 directly charge the power-consuming load;

[0103] if the current power of the power battery 3 is not less than the preset power, the second required data is acquired.

[0104] The current power is the power at the current time, and the preset power is a preset power used to evaluate whether the power reaches a lower standard.

[0105] As an example, the VCU can acquire the current power of the power battery 3, compare the current power with the preset power; if the current power of the power battery 3 is less than the preset power, it is determined that the power of the power battery 3 is small and may not meet the requirement of the power-consuming load, at this time, the first switch K1 can be controlled to be turned on, the second switch K2 can be controlled to be turned off, and the engine 5 can be controlled to work to drive the generator 4 to rotate so that the generator 4 generates current to directly charge the power-consuming load by the generator 4 and the power battery 3; if the current power of the power battery 3 is not less than the preset power, it is determined that the power of the power battery 3 is large and basically meets the requirement of the power-consuming load, at this time, steps S21-S23 can be performed.

[0106] When the power battery 3 is an 800V power battery, a charging pile 7 with a highest working voltage of 800V generally needs to be used for charging, and if the highest 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.

[0107] The utility model discloses an embodiment provides a kind of charging control system, including power battery 3 and the motor control circuit in above embodiment;The two ends of power battery 3 are connected with the two ends of multiple first half bridges respectively, the first end and the second end of motor control circuit are used to connect the two ends of charging pile 7 respectively, to make charging pile 7 direct connection charging or boost charging to power battery 3.

[0108] As an example, the charging control system includes power battery 3 and the motor control circuit in the above embodiment, the two ends of power battery 3 are connected with the two ends of multiple first half bridges respectively, the first end and the second end of motor control circuit are used to connect the two ends of charging pile 7 respectively, according to actual conditions, control first switch K1, second switch K2 and first motor controller 1 work, to make charging pile 7 can direct connection charging or boost charging to power battery 3. For example, control first switch K1 is turned on, second switch K2 is disconnected, first motor controller 1 does not work, to make charging pile 7 directly charges power battery 3;For example, control first switch K1 is disconnected, second switch K2 is turned on, control first motor controller 1 work, to make motor control circuit boost the supply voltage of charging pile 7, so that the charging voltage of the two ends of power battery 3 is greater than the supply voltage of charging pile 7, to achieve the purpose of boost control. When first switch K1 is disconnected, second switch K2 is turned on, the upper bridge pipe S1 and the lower bridge pipe S2 of first motor controller 1 are controlled to work alternately, and the specific control process is as follows: (1) control the lower bridge pipe S2 connected with first inductor L1 to be turned on first, to make the current output from the first end of charging pile 7 flow through first inductor L1, and return to the second end of charging pile 7, to make charging pile 7 charge first inductor L1;(2) control the upper bridge pipe S1 connected with first inductor L1 to be turned on, to make the current output from the first end of charging pile 7 flow through first inductor L1 and power battery 3 in turn, and return to the second end of charging pile 7, to make charging pile 7 charge power battery 3, because the current of first inductor L1 cannot be mutated volt-second characteristic, so that first inductor L1 also charges power battery 3, so that the charging voltage of the two ends of power battery 3 is greater than the supply voltage of charging pile 7, thereby realizing boost charging function.

[0109] In an embodiment, the charging control system further includes a third switch K7, the first end of the third switch K7 is connected with the first end of the motor control circuit, and the second end of the third switch K7 is used to connect the first end of the charging pile 7.

[0110] As an example, the charging control system further comprises other circuit structures, for example, when the second motor controller 2 is further connected to the two ends of the motor control circuit, in order to guarantee the normal implementation of the charging function, a third switch K7 is further arranged, 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 for connecting the first end of the charging pile 7; when the third switch K7 is turned off, the charging pile 7 is not connected to the charging control system; when the third switch K7 is turned on, the charging pile 7 is connected to the charging control system, and the first switch K1, the second switch K2 and the first motor controller 1 can be controlled to work according to actual conditions, so that the charging pile 7 can directly charge or boost charge the power battery 3.

[0111] The charging control method is suitable for the motor control system in the above embodiment, and is particularly suitable for a control device connected to the motor control system, and the control device can be a vehicle control unit (VCU) arranged on a vehicle. The charging control method comprises the following steps.

[0112] S31: acquiring third demand data;

[0113] S32: when the third demand data meets a preset boost condition, controlling the first switch K1 to be turned off, controlling the second switch K2 to be turned on, and controlling the lower bridge tube S2 and the upper bridge tube S1 connected to the first inductor L1 in the first motor controller 1 to be turned on in an interleaved manner, so that the charging pile 7 boosts charges the power battery 3;

[0114] S33: when the third demand data does not meet the preset boost condition, controlling the first switch K1 to be turned on and the second switch K2 to be turned off, so that the charging pile 7 directly charges the power battery 3.

[0115] The third demand data is data for reflecting the charging and discharging demand between the power battery 3 and the charging pile 7. The preset boost condition is a condition for evaluating whether the discharge voltage of the charging pile 7 needs to be boosted.

[0116] As an example, the VCU is connected to the two ends of the charging pile 7 at the first end and the second end of the motor control circuit, so that when the power battery 3 can receive the charge of the charging pile 7, the third demand data needs to be further acquired through a CAN bus or other communication modes; then, the third demand data is compared with the preset boost condition, so as to determine whether the discharge voltage of the charging pile 7 needs to be boosted according to the comparison result.

[0117] As an example, when the third demand data meets the preset boost condition, the VCU needs to control the first switch K1 to be turned off, control the second switch K2 to be turned on, and control the first motor controller 1 to work, so that the motor control circuit boosts the charging voltage of the charging pile 7, so that the charging voltage across the power battery 3 is greater than the power supply voltage of the charging pile 7, so as to guarantee the charging efficiency of the power battery 3. 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 interleaved manner, and the specific control process is as follows: (1) first control the lower bridge tube S2 connected with the first inductor L1 to be turned on, so that the current output from the first end of the charging pile 7 flows through the first inductor L1 and returns 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 tube S1 connected with the first inductor L1 to be turned on, so that the current output from the first end of the charging pile 7 flows through the first inductor L1 and the power battery 3 in turn, and returns to the second end of the charging pile 7, so that the charging pile 7 charges the power battery 3. Due to the current cannot be abruptly changed volt-second characteristic of the first inductor L1, the first inductor L1 also charges the power battery 3, so that the charging voltage across the power battery 3 is greater than the power supply voltage of the charging pile 7, thereby realizing the boost charging function.

[0118] As an example, when the third demand data does not meet the preset boost condition, 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 directly charges the power battery 3, thereby guaranteeing the charging efficiency of the power battery 3.

[0119] In an embodiment, the third demand data includes a third voltage difference, which is a difference between a battery voltage of the power battery 3 and a highest working voltage of the charging pile 7.

[0120] The preset boost condition is that the third voltage difference is greater than a third voltage difference threshold.

[0121] The battery voltage of the power battery 3 is the battery voltage of the power battery 3, for example, in an 800V high-voltage platform, the battery voltage of the power battery 3 is 800V. The highest working voltage of the charging pile 7 is the maximum voltage of the charging pile 7 for discharging externally, for example, the highest working voltage of the charging pile 7 can be 500V, or 800V matched with the 800V high-voltage platform.

[0122] As an example, in step S31, the VCU can obtain the battery voltage of the power battery 3 and the maximum working voltage of the charging pile 7, and then determine the difference between the battery voltage of the power battery 3 and the maximum working voltage of the charging pile 7 as a third voltage difference; then, compare the third voltage difference with a 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 working voltage of the charging pile 7, and if the discharge voltage of the charging pile 7 is directly used to charge the power battery 3, there will be a problem of low charging efficiency, so the discharge voltage of the charging pile 7 needs to be stepped down, and it can be determined that it meets the preset voltage boosting condition; otherwise, 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 working voltage of the charging pile 7, and the discharge voltage of the charging pile 7 can be directly used to charge the power battery 3 to ensure its charging efficiency, so it is determined that it does not meet the preset voltage boosting condition.

[0123] In this example, when the battery voltage of the power battery 3 is 800V and the third voltage difference threshold is 100V, if the maximum working 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 it meets the preset voltage boosting condition, the first switch K1 is controlled to be open, the second switch K2 is controlled to be conductive, and the first motor controller 1 is controlled to work, so that the motor control circuit boosts the charging voltage of the charging pile 7, so that the charging voltage of the power battery 3 is greater than the supply voltage of the charging pile 7, to achieve the purpose of voltage boosting control; otherwise, if the maximum working 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 it does not meet the preset voltage boosting condition, the first switch K1 is controlled to be conductive, and the second switch K2 is controlled to be conductive, so that the charging pile 7 directly charges the power battery 3.

[0124] In an embodiment, the charging control system further comprises a third switch K7, a first end of the third switch K7 being connected to a first end of the motor control circuit, and a second end of the third switch K7 being used to connect a first end of the charging pile 7.

[0125] The charging control method further comprises: controlling the third switch K7 to be conductive.

[0126] As an example, the charging control system further comprises other circuit structures, for example, when the second motor controller 2 is further connected to the two ends of the motor control circuit, in order to guarantee the normal implementation of the charging function, a third switch K7 is further arranged, a first end of the third switch K7 is connected to the first end of the motor control circuit, and a second end of the third switch K7 is used for connecting the first end of the charging pile 7; when it is required to control the charging pile 7 to charge the power battery 3, the third switch K7 needs to be controlled to be turned on, and according to the battery voltage of the power battery 3 and the highest working 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.

[0127] The embodiment of the utility model provides a kind of high-voltage system, as shown in Figure 2 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.

[0128] The two ends of the power battery 3 are connected to the two ends of the plurality of first half-bridges.

[0129] 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 midpoints of the plurality of second half-bridges are used for connecting the motor windings of the drive motor 6.

[0130] The first end and the second end of the motor control circuit are respectively used for connecting the two ends of the power load or the two ends of the charging pile 7.

[0131] In the example, the drive motor 6 is the first motor in the above embodiment, the first end and the second end of the motor control circuit are connected to the second motor controller 2, the second motor controller 2 is connected to the drive motor 6, and the motor driving method in the above embodiment can be executed to control the drive motor 6 to work; moreover, the first end and the second end of the motor control circuit can also be used for connecting the two ends of the power load, so that the discharge control method in the above embodiment can be implemented to supplement the power load; or the first end and the second end of the motor control circuit can also be used for connecting the two ends of the charging pile 7 to accept the charging of the charging pile 7.

[0132] In an embodiment, the high-voltage system further includes a generator 4 and an engine 5, 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.

[0133] In the example, the engine 5 can be controlled to drive the generator 4 to rotate and generate current, so that the generator 4 can supply power to the drive motor 6 together with the power battery 3 to drive the drive motor 6 to work, or so that the generator 4 can supply power to the power load together with the power battery 3 to realize power compensation for the power load.

[0134] A control device includes 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 in the above embodiments, or implements the discharging control method in the above embodiments, or implements the charging control method in the above embodiments, and details are not repeated here.

[0135] A vehicle includes the motor control circuit in the above embodiments, or the motor control system in the above embodiments, or the motor drive system in the above embodiments, or the discharging control system in the above embodiments, or the charging control system in the above embodiments, or the high-voltage system in the above embodiments, or the control device in the above embodiments, and details are not repeated here.

[0136] The above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacements for some technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application.

Claims

1. A motor control circuit, characterized by, 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 midpoints of at least one of the first half-bridges are 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 respectively 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 respectively connected to the first ends and the second ends of the plurality of first half-bridges. The two ends of the second capacitor are respectively 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 characterized by comprising: 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 circuit of claim 4.

5. An electric motor drive system characterized by comprising: 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 control system further comprises a generator and an engine, the engine is connected to the generator, and the motor windings of the generator are connected to the first motor controller, so that the generator and the power battery directly drive the second motor controller to work.

6. The motor drive system of claim 5, wherein, The motor control system comprises a power battery and the motor control circuit of any one of claims 1-3.

7. A discharge control system characterized by comprising: The two ends of the power battery are respectively connected to the two ends of the plurality of first half-bridges, and the first end and the second end of the motor control circuit are respectively used for connecting two ends of a load, so that the power battery directly charges or step-down charges the load. The motor control system further comprises a generator and an engine, the engine is connected to the generator, and the motor windings of the generator are connected to the first motor controller, so that the generator and the power battery directly charge the load.

8. The electric discharge control system of claim 7, wherein The motor control system comprises a power battery and the motor control circuit of any one of claims 1-3.

9. A charge control system characterized by comprising: The two ends of the power battery are respectively connected to the two ends of the plurality of first half-bridges, and the first end and the second end of the motor control circuit are respectively used for connecting two ends of a charging pile, so that the charging pile directly charges or step-up charges the power battery. The charging control system further comprises a third switch, the first end of the third switch is connected to the first end of the motor control circuit, and the second end of the third switch is used for connecting the first end of the charging pile.

10. The charge control system of claim 9, wherein ​ 11. A high voltage system characterized by The motor control circuit, the second motor controller, the power battery and the driving motor of any one of claims 1-3; Two ends of the power battery are connected with two ends of the plurality of first half-bridges; The second motor controller comprises a plurality of second half-bridges, first ends of the plurality of second half-bridges are connected with the first end of the motor control circuit, second ends of the plurality of second half-bridges are connected with the second end of the motor control circuit, and midpoints of the plurality of second half-bridges are used for connecting motor windings of the driving motor; The first end and the second end of the motor control circuit are respectively used for connecting two ends of an electric load or two ends of a charging pile.

12. The high pressure system of claim 11, wherein, The high-voltage system further comprises a generator and an engine, the engine is connected with the generator, and motor windings of the generator are connected with the first motor controller.

13. An automobile characterized by comprising: 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 7-8, the charging control system of any one of claims 9-10, or the high-voltage system of any one of claims 11-12.

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