Motor controller, drive circuit, power device and electric vehicle

Abstract

The application provides a motor controller, a driving circuit, a power equipment and an electric vehicle. The driving circuit comprises a bridge arm circuit and a driving circuit. The bridge arm circuit comprises a plurality of bridge arms of switching tubes. The driving circuit is configured to provide a plurality of driving voltages for the plurality of switching tubes of the bridge arm circuit. The driving circuit comprises a plurality of transformers, a primary side switch and a control unit. The primary side winding of each transformer comprises a primary side main winding and a primary side feedback winding. The secondary side winding of each transformer is configured to output a driving voltage. One end of each primary side main winding is configured to be connected to a power supply. The other end of each primary side main winding is connected to one end of a primary side switch. At least one primary side feedback winding is configured to provide a feedback voltage signal to the control unit. The control unit is configured to control the operation of the primary side switch according to the feedback voltage signal. The motor controller provided by the embodiment reduces the structural complexity of the driving circuit and the motor controller.

Description

Technical Field

[0001] This application relates to the field of electric vehicle technology, and in particular to a motor controller, drive circuit, power equipment, and electric vehicle. Background Technology

[0002] Motor controllers typically utilize multiple switching transistor bridge arms to form an inverter circuit that provides AC power to the motor. The switching on and off of the multiple transistors in these bridge arms needs to be coordinated yet independent. Existing motor controllers usually use multiple drive circuits to provide drive voltages to these multiple transistors, thus requiring a large number of drive circuits and resulting in a complex internal circuit layout. Therefore, reducing the structural complexity of the drive circuits and the motor controller they reside in is a technical problem that needs to be solved in this field. Summary of the Invention

[0003] This application provides a motor controller, drive circuit, power equipment, and electric vehicle to solve the technical problem of high structural complexity of the drive circuit and its motor controller in the prior art.

[0004] The first aspect of this application provides a motor controller, including a bridge arm circuit and a drive circuit. The bridge arm circuit includes multiple switching transistor bridge arms, the midpoints of which are connected to the motor windings of a drive motor. The drive circuit provides multiple drive voltages to the multiple switching transistors of the bridge arm circuit, and includes multiple transformers, a primary-side switch, and a control unit.

[0005] Specifically, each transformer's primary winding includes a primary main winding and a primary feedback winding. Each transformer's secondary winding outputs a drive voltage. One end of each primary main winding is connected to a power supply, and the other end is connected to one end of a primary switching transistor. At least one primary feedback winding provides a feedback voltage signal to the control unit. The control unit controls the operation of the primary switching transistor based on the feedback voltage signal.

[0006] The drive circuit of the motor controller provided in this embodiment can provide three drive voltages to three switching transistors in the bridge arm circuit through the primary winding of a transformer. This eliminates the need for a large number of control circuits and primary-side switches in the drive circuit, and also eliminates the need to wind a large number of windings on a transformer, thereby reducing the structural complexity of the drive circuit and the motor controller.

[0007] In one embodiment of the first aspect of this application, the opposite-named terminal of the primary winding of each transformer is used to connect to a power supply, and the same-named terminal of the primary winding of each transformer is connected to one end of a primary-side switching transistor. Therefore, each transformer in the drive circuit provided in this embodiment can receive the input voltage provided by the power supply, enabling the transformer to be used to obtain a drive voltage based on the input voltage.

[0008] In one embodiment of the first aspect of this application, multiple primary-side feedback windings are connected in parallel, and one end of each feedback winding provides a feedback voltage signal to the control unit. In the drive circuit provided in this embodiment, the primary-side feedback windings of the three transformers are connected in parallel and can output a voltage feedback signal to the control unit, enabling the control unit to control the operation of the primary-side switching transistors based on the voltage feedback signal, thereby adjusting the drive signal voltage output by the three transformers.

[0009] In one embodiment of the first aspect of this application, the corresponding terminal of the primary feedback winding of each transformer provides a feedback signal to the control unit.

[0010] In one embodiment of the first aspect of this application, the primary feedback windings of multiple transformers are connected in series, and one end of the primary feedback winding of one transformer provides a feedback voltage signal to the control unit. In the drive circuit provided in this embodiment, the primary feedback windings of three transformers are connected in series, and one of the primary feedback windings can output a voltage feedback signal to the control unit. This allows the control unit to control the operation of the primary switching transistor based on the voltage feedback signal, thereby enabling the detection and protection against short circuits or open circuits in any of the three transformers.

[0011] In one embodiment of the first aspect of this application, the same-name terminal of the primary feedback winding of one transformer provides a feedback voltage signal to the control unit, and the opposite-name terminal of the primary feedback winding of one transformer is connected to the same-name terminal of the primary feedback winding of another transformer.

[0012] In one embodiment of the first aspect of this application, the control unit includes a feedback signal input terminal, which receives a voltage feedback signal provided by at least one primary-side feedback winding through a voltage divider circuit.

[0013] Specifically, the voltage divider circuit includes two resistors and at least one diode. One end of one resistor is connected to the feedback signal input terminal, one end of the other resistor is connected to one end of the other resistor, and the other end of the other resistor is grounded. The connection point of the two resistors is used to connect to the cathode of at least one diode, and the anode of the at least one diode is used to receive the voltage feedback signal provided by at least one primary-side feedback winding. The control unit in the drive circuit provided in this embodiment can receive the feedback voltage signal through the voltage divider circuit, making the structure of the drive circuit relatively simple.

[0014] In one embodiment of the first aspect of this application, the secondary winding of each transformer includes two secondary sub-windings. The two ends of each secondary sub-winding are connected by a diode and a capacitor connected in series, and one end of one secondary sub-winding is connected to the other end of the other secondary winding. In the driving circuit provided in this embodiment, each transformer can provide two driving voltages to the switching transistor through the two secondary sub-windings. The two driving voltages are used to drive the switching transistor to turn on and off, respectively. Since one secondary winding can provide two driving voltages simultaneously, the structure of the driving circuit is simplified.

[0015] In one embodiment of the first aspect of this application, the same-name terminal of one secondary sub-winding is connected to the anode of a first diode, the cathode of the first diode is connected to one end of a first capacitor, and the other end of the first capacitor is connected to the opposite-name terminal of one secondary sub-winding. The opposite-name terminal of another secondary sub-winding is connected to one end of a second capacitor, the other end of the second capacitor is connected to the anode of a second diode, and the cathode of the second diode is connected to the opposite-name terminal of one secondary sub-winding. The opposite-name terminal of one secondary sub-winding is connected to the same-name terminal of another secondary sub-winding.

[0016] In one embodiment of the first aspect of this application, the secondary winding of each transformer is used to connect a switching transistor via a driving unit. The driving unit includes a first input terminal, a second input terminal, and an output terminal. Specifically, one end of one secondary sub-winding of each transformer's secondary winding is connected to the first input terminal of the driving unit, and one end of the other secondary sub-winding is connected to the second input terminal of the driving unit. The control terminal of the switching transistor is connected to the output terminal of the driving unit. When the first input terminal and output terminal of the driving unit are connected, the secondary winding outputs a first driving voltage to the control terminal of the switching transistor. When the second input terminal and output terminal of the driving unit are connected, the secondary winding outputs a second driving voltage to the control terminal of the switching transistor. In the driving circuit provided in this embodiment, the driving unit can receive driving voltages provided by the two secondary sub-windings of the transformer and provide one of the driving voltages to the control terminal of the switching transistor to control the switching transistor's on and off states. When the control unit can adjust the driving voltage value based on the voltage feedback signal, the driving unit can drive the switching transistor according to a more accurate driving signal, ensuring accurate driving of the switching transistor by the driving unit.

[0017] In one embodiment of the first aspect of this application, the motor controller includes two drive circuits, and each switching bridge arm includes an upper bridge arm switch and a lower bridge arm switch. One drive circuit provides multiple drive voltages to the multiple upper bridge arm switches of the bridge arm circuit, and the other drive circuit provides multiple drive voltages to the multiple upper bridge arm switches of the bridge arm circuit, thereby isolating the power supply grounds of the three upper bridge arm switches from those of the three lower bridge arm switches.

[0018] In one embodiment of the first aspect of this application, the primary-side switch is periodically turned on and off according to a control signal output by the control unit. The control unit is used to adjust the duty cycle of the control signal output by the control unit according to the comparison result of the feedback voltage signal and at least one predetermined value, so that the transformer performs voltage transformation processing on the input voltage through a flyback method to obtain the drive voltage, and the voltage value of the input voltage is different from the voltage value of the drive signal.

[0019] In one embodiment of the first aspect of this application, the control unit is configured to reduce the duty cycle of the control signal output by the control unit in response to a feedback voltage signal value being greater than or equal to a first predetermined value. Alternatively, the control unit may increase the duty cycle of the control signal output by the control unit in response to a feedback voltage signal value being less than or equal to a second predetermined value, where the second predetermined value is less than the first predetermined value. In the drive circuit provided in this embodiment, when the voltage value of the drive signal output by the secondary winding of any of the three transformers does not meet the voltage value required by the switching transistor, the control unit can adjust the duty cycle of the primary-side switching transistor based on the voltage feedback signal. This achieves self-equalization of the drive signals output by the secondary windings of the three transformers through voltage closed-loop control, thereby reducing the deviation between the voltage values ​​of the drive signals output by the secondary windings of the three transformers and ensuring the consistency of the voltage values ​​of the drive signals output by the secondary windings of the three transformers.

[0020] Alternatively, the control unit responds to the feedback voltage signal value being greater than or equal to a third predetermined value by controlling the primary-side switch to turn off. In the drive circuit provided in this embodiment, when any of the three transformers experiences a short circuit or open circuit, resulting in a high output drive signal voltage value, the control unit can detect the abnormality in a timely manner based on the voltage feedback signal. Then, based on the voltage feedback signal, it adjusts the duty cycle of the primary-side switch, thereby controlling all three transformers to stop outputting drive voltage, achieving overvoltage protection for the switches driven by the three transformers.

[0021] A second aspect of this application provides a drive circuit including multiple transformers, primary-side switching transistors, and a control unit. Each transformer's primary winding includes a primary main winding and a primary feedback winding. Each transformer's secondary winding outputs a drive voltage. One end of each primary main winding is connected to a power supply, and the other end is connected to one end of a primary-side switching transistor. At least one primary feedback winding provides a feedback voltage signal to the control unit. The control unit controls the operation of the primary-side switching transistors based on the feedback voltage signal. The drive circuit provided in this embodiment can provide three drive voltages to three switching transistors in the bridge arm circuit through the primary main winding of one transformer. This reduces the need for a large number of control circuits and primary-side switches in the drive circuit, and also reduces the need for a large number of windings on a single transformer, thereby reducing the structural complexity of the drive circuit and motor controller.

[0022] A third aspect of this application provides a power device, including a drive motor and a motor controller as provided in any of the first aspects. The motor controller is used to supply power to the drive motor.

[0023] A fourth aspect of this application provides an electric vehicle, including wheels, a drive motor, and a motor controller as provided in any of the first aspects of this application. The motor controller supplies power to the drive motor, and the drive motor receives power from the motor controller and drives the wheels. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of a driving circuit.

[0025] Figure 2 This application provides a structural schematic diagram of an electric vehicle;

[0026] Figure 3 A schematic diagram of the structure of a motor controller provided in this application;

[0027] Figure 4 A schematic diagram of the circuit structure of a driving circuit provided in this application;

[0028] Figure 5 A schematic diagram of the circuit structure of another driving circuit provided in this application. Detailed Implementation

[0029] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0030] The terms “first,” “second,” “third,” “fourth,” etc. (if present) in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a particular order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented, for example, in orders other than those illustrated or described herein. Furthermore, the terms “comprising” and “having,” and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0031] The connection relationships described in this application refer to direct or indirect connections. For example, the connection between A and B can be a direct connection between A and B, or an indirect connection between A and B through one or more other electrical components. For instance, A could be directly connected to C, and C could be directly connected to B, thus achieving a connection between A and B through C. It is also understood that the "A connecting to B" described in this application can be a direct connection between A and B, or an indirect connection between A and B through one or more other electrical components.

[0032] Figure 1 This is a schematic diagram of a driving circuit. (Example) Figure 1 As shown, the drive circuit 102 includes a transformer T11, a primary-side switch Q11, a control unit N11, and a drive unit K11. The drive circuit 102 provides a drive voltage to one switch. Typically, the bridge arm circuit in a motor controller includes six switches. Correspondingly, the motor controller needs to include six drive circuits 102, increasing the circuit complexity and the area required for implementation on the circuit board, thus increasing the cost of the motor controller and the electric vehicle it is mounted on. Furthermore, since the motor controller provides drive voltages to multiple switches through multiple drive circuits 102, the voltage values ​​provided by each drive circuit 102 may have significant errors, affecting the operating efficiency of the bridge arm circuit in the motor controller.

[0033] Based on this, this application provides a motor controller, a drive circuit, a power equipment, and an electric vehicle to solve the technical problem of high structural complexity in existing drive circuits. The technical solution of this application will be described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments.

[0034] Figure 2 This is a structural schematic diagram of an electric vehicle provided in this application. Figure 2 The electric vehicle 1 shown includes a motor controller 10, a drive motor 11, and wheels 12. The motor controller 10 supplies power to the drive motor 11. The drive motor 11 receives power from the motor controller 10 and drives the wheels 12 to rotate.

[0035] In one embodiment, the electric vehicle 1 includes a power unit and wheels 12. The power unit includes a motor controller 10 and a drive motor 11. The power unit receives power from the electric vehicle 1's power battery and drives the wheels 12 to rotate.

[0036] For example, the motor controller 10 can receive a DC voltage VDC provided by a power supply device such as a power battery of the electric vehicle 1, and convert the DC voltage VDC into a three-phase AC voltage VAC. The motor controller 10 provides the three-phase AC voltage VAC to the drive motor 11 to supply power to the drive motor 11. For example, the three-phase AC voltage VAC includes U-phase AC voltage, V-phase AC voltage, and W-phase AC voltage, etc.

[0037] Figure 3 This is a schematic diagram of the structure of a motor controller provided in this application. Figure 3 As shown, the motor controller 10 includes a bridge arm circuit 101 and a drive circuit 102. The bridge arm circuit 101 receives a DC voltage VDC and inverts it to obtain a three-phase AC voltage VAC. The drive circuit 102 provides multiple drive voltages to the multiple switches in the bridge arm circuit 101. Figure 3 The motor controller 10 shown can be applied to, for example... Figure 1 The electric vehicle 1 and the power equipment shown.

[0038] In this embodiment, the bridge arm circuit 101 includes multiple switching bridge arms. Each switching bridge arm includes an upper bridge arm switch and a lower bridge arm switch. In each switching bridge arm, one end of the upper bridge arm switch and the other end of the lower bridge arm switch serve as the two ends of each switching bridge arm, respectively. The other ends of the upper bridge arm switch and one end of the lower bridge arm switch are connected to form the midpoint of each switching bridge arm. The midpoint of each switching bridge arm is used to connect the motor windings of the drive motor 11. The two ends of each switching bridge arm are used to receive a DC voltage VDC.

[0039] In this embodiment, the upper and lower bridge arm switching transistors of each switching bridge arm can be insulated gate bipolar transistors (IGBTs), silicon carbide (SiC) switching transistors, metal-oxide-semiconductor field-effect transistors (MOSFETs), bipolar power transistors, or wide-bandgap semiconductor field-effect transistors, etc. In this embodiment, the IGBT is used as an example of the switching transistors included in the bridge arm circuit 101, rather than as a limitation on its implementation.

[0040] like Figure 3As shown, the bridge arm circuit 101 includes a first switching transistor bridge arm 1011, a second switching transistor bridge arm 1012, and a third switching transistor bridge arm 1013. The first switching transistor bridge arm 1011 includes an upper bridge arm switch G1 and a lower bridge arm switch G2. The second switching transistor bridge arm 1012 includes an upper bridge arm switch G3 and a lower bridge arm switch G4. The third switching transistor bridge arm 1013 includes an upper bridge arm switch G5 and a lower bridge arm switch G6.

[0041] For example, one end of the upper bridge arm switch G1 is connected to the positive terminal P+ of the DC voltage VDC, and the other end of the lower bridge arm switch G2 is connected to the negative terminal N- of the DC voltage VDC. The other end of the upper bridge arm switch G1 and one end of the lower bridge arm switch G2 are connected to form the midpoint A of the first switch arm 1011. The midpoint A of the first switch arm 1011 is used to connect the drive motor 11 and provide the drive motor 11 with the U-phase AC voltage.

[0042] For example, one end of the upper bridge arm switch G3 is connected to the positive terminal P+ of the DC voltage VDC, and the other end of the lower bridge arm switch G4 is connected to the negative terminal N- of the DC voltage VDC. The other end of the upper bridge arm switch G3 and one end of the lower bridge arm switch G4 are connected to form the midpoint B of the second switch arm 1012. The midpoint B of the second switch arm 1012 is used to connect the drive motor 11 and provide the drive motor 11 with V-phase AC voltage.

[0043] For example, one end of the upper bridge arm switch G5 is connected to the positive terminal P+ of the DC voltage VDC, and the other end of the lower bridge arm switch G6 is connected to the negative terminal N- of the DC voltage VDC. The other end of the upper bridge arm switch G5 and one end of the lower bridge arm switch G6 are connected to form the midpoint C of the third switch arm 1013. The midpoint C of the third switch arm 1013 is used to connect the drive motor 11 and provide the drive motor 11 with the W-phase AC voltage.

[0044] In this embodiment, the driving circuit 102 provides multiple driving voltages to the multiple switching transistors of the bridge arm circuit 101. Specifically, the driving circuit 102 provides multiple driving voltages to the upper and lower bridge arm switching transistors of the multiple switching transistor bridge arms in the bridge arm circuit 101. In this embodiment, the driving voltages are used to control the switching transistors to turn on or off.

[0045] exist Figure 2 In the example shown, the drive circuit 102 provides a first drive voltage H1 to the upper bridge arm switch G1. The upper bridge arm switch G1 is turned on or off according to the first drive voltage H1. For example, when the first drive voltage H1 is high, the upper bridge arm switch G1 is turned on according to the first drive voltage H1. When the first drive voltage H1 is low, the upper bridge arm switch G1 is turned off according to the first drive voltage H1.

[0046] For example, the driving circuit 102 is used to provide a second driving voltage H2 to the lower bridge arm switch G2, a third driving voltage H3 to the upper bridge arm switch G3, a fourth driving voltage H4 to the lower bridge arm switch G4, a fifth driving voltage H5 to the upper bridge arm switch G5, and a sixth driving voltage H6 to the lower bridge arm switch G6.

[0047] In one embodiment, the drive circuit 102 is used to receive the input voltage Vin provided by the power supply 100, and to obtain multiple drive voltages respectively provided to the multiple switching transistors in the bridge arm circuit 101 based on the input voltage Vin. In one embodiment, as... Figure 2 The power supply 100 shown may be a digital signal processing (DSP) unit in the motor controller 10.

[0048] Figure 4 This is a schematic diagram of the circuit structure of a driving circuit provided in this application. Figure 4 The driving circuit shown can be applied to, for example Figure 3 The motor controller 10 shown.

[0049] In this embodiment, the motor controller 10 includes two drive circuits. One drive circuit provides multiple drive voltages to multiple upper bridge arm switches in the bridge arm circuit of the motor controller 10. The other drive circuit provides multiple drive voltages to multiple lower bridge arm switches in the bridge arm circuit of the motor controller 10.

[0050] exist Figure 4 In the example shown, the motor controller 10 includes a drive circuit 1021 and a drive circuit 1022. The drive circuit 1021 provides drive voltages H1, H3, and H5 to the multiple upper bridge arm switches Q1, Q3, and Q5 in the bridge arm circuit 101, respectively. The drive circuit 1022 provides drive voltages H2, H4, and H6 to the multiple lower bridge arm switches Q2, Q4, and Q6 in the bridge arm circuit 101, respectively.

[0051] In this embodiment, each drive circuit includes multiple transformers, a primary-side switching transistor, and a control unit. Each transformer's primary winding includes a primary main winding and a primary feedback winding. Each transformer's secondary winding outputs a drive voltage. One end of each primary main winding is connected to a power supply, and the other end is connected to one end of the primary-side switching transistor. At least one primary feedback winding provides a feedback voltage signal to the control unit. The control unit controls the operation of the primary-side switching transistor based on the feedback voltage signal.

[0052] In one embodiment, the opposite-named terminal of the primary winding of each transformer in each drive circuit is used to connect to the power supply, and the same-named terminal of the primary winding of each transformer is connected to one end of the primary switching transistor.

[0053] exist Figure 4 In the example shown, the drive circuit 1021 includes a primary-side switch Q31, a control unit N31, and multiple transformers. These transformers include a first transformer T31, a second transformer T32, and a third transformer T33. One end of the primary winding of each transformer is connected to the power supply 100, and the other end of the primary winding of each transformer is connected to one end of the primary-side switch Q31.

[0054] For example, the opposite-named terminal of the primary winding Ta of the first transformer T31 is used to connect to the power supply 100 and receive the input voltage Vin provided by the power supply 100. The same-named terminal of the primary winding Ta of the first transformer T31 is connected to one end of the primary-side switching transistor Q31, and the other end of the primary-side switching transistor Q31 is grounded through resistor R31. The opposite-named terminal of the primary winding Ta of the second transformer T32 is used to connect to the power supply 100 and receive the input voltage Vin provided by the power supply 100. The same-named terminal of the primary winding Ta of the second transformer T32 is connected to one end of the primary-side switching transistor Q31. The opposite-named terminal of the primary winding Ta of the third transformer T33 is used to connect to the power supply 100 and receive the input voltage Vin provided by the power supply 100. The same-named terminal of the primary winding Ta of the third transformer T33 is connected to one end of the primary-side switching transistor Q31.

[0055] In this embodiment, the secondary winding of each transformer is used to connect to a switching transistor in the bridge arm circuit 101 via a driving unit. Specifically, the secondary winding of each transformer is used to output a driving voltage to a switching transistor in the bridge arm circuit 101 via a driving unit.

[0056] like Figure 4As shown, the secondary winding of the first transformer T31 outputs a driving voltage H1 to the upper bridge arm switch G1 through the first driving unit K31, the secondary winding of the second transformer T21 outputs a driving voltage H3 to the upper bridge arm switch G3 through the second driving unit K32, and the secondary winding of the third transformer T33 outputs a driving voltage H5 to the upper bridge arm switch G5 through the third driving unit K33.

[0057] In this embodiment, each driving unit includes a first input terminal, a second input terminal, and an output terminal. In this embodiment, the secondary winding of each transformer includes two secondary sub-windings, with both ends of each sub-winding connected in series via a diode and a capacitor. One end of one sub-winding is connected to the other end of the other sub-winding. Specifically, one end of one sub-winding in each transformer's secondary winding is connected to the first input terminal of the driving unit, and one end of the other sub-winding is connected to the second input terminal of the driving unit. The control terminal of a switching transistor is connected to the output terminal of the driving unit.

[0058] In this embodiment, the first input terminal and output terminal of each driving unit are connected, and the secondary winding outputs a first driving voltage to the control terminal of a switching transistor. The second input terminal and output terminal of each driving unit are connected, and the secondary winding outputs a second driving voltage to the control terminal of a switching transistor.

[0059] like Figure 4 As shown, the first driving unit K31 includes a first input terminal in1, a second input terminal in2, and an output terminal out. The secondary winding of the first transformer T31 includes a secondary sub-winding Tb and a secondary sub-winding Tc. The same-name terminal of the secondary sub-winding Tb is connected to the anode of the first diode D31, the cathode of the first diode D31 is connected to one end of the first capacitor C31, and the other end of the first capacitor C31 is connected to the opposite-name terminal of the secondary sub-winding Tb. The same-name terminal of the secondary sub-winding Tc is connected to one end of the second capacitor C32, the other end of the second capacitor C32 is connected to the anode of the second diode D32, and the cathode of the second diode D32 is connected to the opposite-name terminal of the secondary sub-winding Tc. Additionally, the opposite-name terminal of the secondary sub-winding Tb of the first transformer T31 is connected to the same-name terminal of the secondary sub-winding Tc.

[0060] The same-name terminal of the secondary sub-winding Tb is connected to the first input terminal in1 of the first driving unit K31 via the first diode D31, and the opposite-name terminal of the secondary sub-winding Tc is connected to the second input terminal in2 of the first driving unit K31 via the second diode D32. The output terminal out of the first driving unit K31 is used to connect to the control terminal of the upper bridge arm switch G1. Specifically, the first input terminal in1 and the output terminal out of the driving unit K31 are connected, and the secondary sub-winding Tb1 of the first transformer T31 provides a first driving voltage to the upper bridge arm switch G1 through the driving unit K31. The second input terminal in2 and the output terminal out of the driving unit K31 are connected, and the secondary sub-winding Tc of the first transformer T31 provides a second driving voltage to the upper bridge arm switch G1 through the driving unit K31.

[0061] like Figure 4 As shown, the second drive unit K32 includes a first input terminal in1, a second input terminal in2, and an output terminal out. The secondary winding of the second transformer T32 includes a secondary sub-winding Tb and a secondary sub-winding Tc. The same-name terminal of the secondary sub-winding Tb is connected to the positive terminal of the first diode D34, the negative terminal of the first diode D34 is connected to one end of the first capacitor C34, and the other end of the first capacitor C34 is connected to the opposite-name terminal of the secondary sub-winding Tb. The same-name terminal of the secondary sub-winding Tc is connected to one end of the second capacitor C35, the other end of the second capacitor C35 is connected to the positive terminal of the second diode D35, and the negative terminal of the second diode D35 is connected to the opposite-name terminal of the secondary sub-winding Tc. The opposite-name terminal of the secondary sub-winding Tb of the second transformer T32 is connected to the same-name terminal of the secondary sub-winding Tc.

[0062] The same-name terminal of the secondary sub-winding Tb is connected to the first input terminal in1 of the second drive unit K32 via the first diode D34, and the opposite-name terminal of the secondary sub-winding Tc is connected to the second input terminal in2 of the second drive unit K32 via the second diode D35. The output terminal out of the second drive unit K32 is used to connect to the control terminal of the upper bridge arm switch G3. The first input terminal in1 and the output terminal out of the drive unit K32 are connected, and the secondary sub-winding Tb2 of the second transformer T32 provides the first drive voltage to the upper bridge arm switch G3 through the drive unit K32. The second input terminal in2 and the output terminal out of the drive unit K32 are connected, and the secondary sub-winding Tc2 of the second transformer T32 provides the second drive voltage H3-2 to the upper bridge arm switch G3 through the drive unit K32.

[0063] like Figure 4As shown, the third drive unit K33 includes a first input terminal in1, a second input terminal in2, and an output terminal out. The secondary winding of the third transformer T33 includes a secondary sub-winding Tb and a secondary sub-winding Tc. The same-name terminal of the secondary sub-winding Tb is connected to the positive terminal of the first diode D37, the negative terminal of the first diode D37 is connected to one end of the first capacitor C37, and the other end of the first capacitor C37 is connected to the opposite-name terminal of the secondary sub-winding Tb. The same-name terminal of the secondary sub-winding Tc is connected to one end of the second capacitor C38, the other end of the second capacitor C38 is connected to the positive terminal of the second diode D38, and the negative terminal of the second diode D38 is connected to the opposite-name terminal of the secondary sub-winding Tc. The opposite-name terminal of the secondary sub-winding Tb of the third transformer T33 is connected to the same-name terminal of the secondary sub-winding Tc.

[0064] The same-name terminal of the secondary sub-winding Tb is also connected to the first input terminal in1 of the third drive unit K33 via the first diode D37, and the opposite-name terminal of the secondary sub-winding Tc is connected to the second input terminal in2 of the third drive unit K33 via the second diode D38. The output terminal out of the first drive unit K33 is used to connect to the control terminal of the upper bridge arm switch G5. With the first input terminal in1 and the output terminal out of the drive unit K33 connected, the secondary sub-winding Tb3 of the third transformer T33 provides the first drive voltage to the upper bridge arm switch G5 through the drive unit K33. With the second input terminal in2 and the output terminal out of the drive unit K33 connected, the secondary sub-winding Tc3 of the third transformer T33 provides the second drive voltage to the upper bridge arm switch G5 through the drive unit K33.

[0065] In one embodiment, the driving circuit provided in this application has multiple primary-side feedback windings connected in parallel, and one end of each primary-side feedback winding provides a feedback voltage signal to the control unit.

[0066] like Figure 4 As shown, the primary feedback winding Td of the first transformer T31, the primary feedback winding Td of the second transformer T32, and the primary feedback winding Td of the third transformer T31 are connected in parallel.

[0067] In one embodiment, the primary feedback winding of each transformer in the drive circuit provided by this application provides a feedback voltage signal to the control unit at the same-named terminal. For example... Figure 4 As shown, the same-name terminal of the primary feedback winding Td of the first transformer T31, the same-name terminal of the primary feedback winding Td of the second transformer T32, and the same-name terminal of the primary feedback winding Td of the third transformer T31 are used to jointly provide feedback voltage signal FB1 to the control unit N31.

[0068] In one embodiment, the primary feedback windings of multiple transformers in the drive circuit provided in this application are connected in series. One end of the primary feedback winding of one transformer is used to provide the feedback voltage signal to the control unit. Specifically, in one transformer, the same-named end of the primary feedback winding provides the feedback voltage signal to the control unit, and the opposite-named end of the feedback winding is connected to the same-named end of the primary feedback winding of another transformer.

[0069] Figure 5 A schematic diagram of the circuit structure of another driving circuit provided in this application. (See attached diagram.) Figure 5 As shown, the motor controller 10 includes two drive circuits. Exemplarily, the motor controller 10 includes drive circuit 1023 and drive circuit 1024. Drive circuit 1023 provides drive voltages H1, H3, and H5 to the plurality of upper bridge arm switches Q1, Q3, and Q5 in the bridge arm circuit 101, respectively. Drive circuit 1024 provides drive voltages H2, H4, and H6 to the plurality of lower bridge arm switches Q2, Q4, and Q6 in the bridge arm circuit 101, respectively.

[0070] like Figure 5 The driving circuits 1023 and 1024 shown are... Figure 4 The difference between the drive circuits 1021 and 1022 shown lies in the connection method of the primary feedback winding of each transformer.

[0071] like Figure 5 As shown, the drive circuit 1023 includes a first transformer T31, a second transformer T32, and a third transformer T33. The primary feedback windings Td of the first transformer T31, the second transformer T32, and the third transformer T31 are connected in series. The same-name terminal of the primary feedback winding Td of the first transformer T31 is used to provide a feedback voltage signal FB3 to the control unit N31, and the opposite-name terminal of the primary feedback winding Td of the first transformer T31 is connected to the same-name terminal of the primary feedback winding Td of the second transformer T32. Furthermore, the opposite-name terminal of the primary feedback winding Td of the second transformer T32 is connected to the same-name terminal of the primary feedback winding Td of the third transformer T33, and the opposite-name terminal of the primary feedback winding Td of the third transformer T33 is grounded.

[0072] In this embodiment, the control unit includes a feedback signal input terminal. The feedback signal input terminal receives a voltage feedback signal provided by at least one primary-side feedback winding via a voltage divider circuit. The voltage divider circuit includes two resistors and at least one diode. One resistor is connected to the feedback signal input terminal and one end of the other resistor, the other end of the other resistor is grounded, and the connection point of the two resistors is used to connect to the cathode of at least one diode. The anode of the at least one diode is used to receive the voltage feedback signal provided by at least one primary-side feedback winding.

[0073] like Figure 4 As shown, control unit N31 includes a feedback signal input terminal. One end of resistor R32 is connected to the feedback signal input terminal of control unit N31, and the other end of resistor R32 is connected to one end of resistor R33, with the other end of resistor R33 grounded. The connection between resistors R32 and R33 is used to connect the cathodes of diodes D33, D36, and D39. The anode of diode D33 is used to receive the voltage feedback signal provided by the primary feedback winding Td of the first transformer T31, the anode of diode D36 is used to receive the voltage feedback signal provided by the primary feedback winding Td of the second transformer T32, and the anode of diode D39 is used to receive the voltage feedback signal provided by the primary feedback winding Td of the third transformer T33.

[0074] In one embodiment, the two ends of the primary feedback winding Td of the first transformer T31 are used to connect the two ends of the capacitor C33, the two ends of the primary feedback winding Td of the second transformer T32 are used to connect the two ends of the capacitor C36, and the two ends of the primary feedback winding Td of the third transformer T33 are used to connect the two ends of the capacitor C39.

[0075] like Figure 5 As shown, control unit N32 includes a feedback signal input terminal. One end of resistor R35 is connected to the feedback signal input terminal of control unit N31, and the other end of resistor R35 is connected to one end of resistor R36, the other end of which is grounded. The connection between resistors R35 and R36 is used to receive the voltage feedback signal provided by the primary feedback winding Td of the first transformer T34 through diode D312. Specifically, the connection between resistors R35 and R36 is used to connect to the cathode of diode D312, and the corresponding terminal of the primary feedback winding Td of the first transformer T34 is used to connect to the anode of diode D312.

[0076] In this embodiment, the control unit N31 sends control signals to the primary-side switch Q31 to control the primary-side switch's on and off states. The primary-side switch Q31 is turned on and off according to the control signals output by the control unit N31. Specifically, the primary-side switch Q31 is periodically and alternately turned on and off according to the control signals output by the control unit N31. In one embodiment, the control unit N31 periodically outputs control signals to the primary-side switch Q31. For example, after the control unit N31 outputs control signals to the primary-side switch Q31 for a first duration T1, it stops outputting control signals for a second duration T2. ​​Where T1 + T2 = T, and T is the period of the control signal output by the control unit N31. The ratio of T1 to T can be called the duty cycle of the control signal.

[0077] like Figure 4As shown, primary-side switch Q31 receives a control signal from control unit N31. Primary-side switch Q31 turns on according to the control signal, and its source and drain are connected. If primary-side switch Q31 does not receive a control signal from control unit N31, primary-side switch Q31 turns off, disconnecting its source and drain.

[0078] like Figure 4 As shown, control unit N31 outputs a control signal, turning on primary-side switch Q31. The source and drain of primary-side switch Q31 are connected. When control unit N31 stops outputting the control signal, primary-side switch Q31 turns off, disconnecting its source and drain. Primary-side switch Q31 alternately turns on and off according to the control signal, and the input voltage Vin causes primary-side winding voltages to be generated on the primary windings Ta of the first transformer T31, the second transformer T32, and the third transformer T33, respectively.

[0079] The primary winding voltage on the primary winding Ta of the first transformer T31 provides a first secondary winding voltage to its secondary sub-winding Tb through the first transformer T31, and provides a second secondary winding voltage to its secondary sub-winding Tc through the first transformer T31. Correspondingly, the first input terminal in1 of the drive unit K31 is connected to the output terminal out, and the secondary sub-winding Tb1 of the first transformer T31 provides a first drive voltage H1-1 to the upper bridge arm switch G1 through the drive unit K31. Here, the first drive voltage H1-1 is the first secondary winding voltage of the first transformer T31. The second input terminal in2 of the drive unit K31 is connected to the output terminal out, and the secondary sub-winding Tc of the first transformer T31 provides a second drive voltage H1-2 to the upper bridge arm switch G1 through the drive unit K31. Here, the second drive voltage H1-2 is the second secondary winding voltage of the first transformer T31.

[0080] The primary winding voltage on the primary winding Ta of the second transformer T32 provides a first secondary winding voltage to its secondary sub-winding Tb through the second transformer T32, and a second secondary winding voltage to its secondary sub-winding Tc through transformer T31. Correspondingly, the first input terminal in1 of the drive unit K32 is connected to the output terminal out, and the secondary sub-winding Tb2 of the second transformer T32 provides a first drive voltage H3-1 to the upper bridge arm switch G3 through the drive unit K32. Here, the first drive voltage H3-1 is the first secondary winding voltage of the second transformer T32. The second input terminal in2 of the drive unit K32 is connected to the output terminal out, and the secondary sub-winding Tc2 of the second transformer T32 provides a second drive voltage H3-2 to the upper bridge arm switch G3 through the drive unit K32. Here, the second drive voltage H3-2 is the second secondary winding voltage of the second transformer T32.

[0081] The primary winding voltage on the primary winding Ta of the third transformer T33 provides a first secondary winding voltage to its secondary sub-winding Tb through the third transformer T33, and a second secondary winding voltage to its secondary sub-winding Tc through transformer T31. Correspondingly, the first input terminal in1 of the drive unit K33 is connected to the output terminal out, and the secondary sub-winding Tb3 of the third transformer T33 provides a first drive voltage H5-1 to the upper bridge arm switch G5 through the drive unit K33. Here, the first drive voltage H5-1 is the first secondary winding voltage of the third transformer T33. The second input terminal in2 of the drive unit K33 is connected to the output terminal out, and the secondary sub-winding Tc3 of the third transformer T33 provides a second drive voltage H5-2 to the upper bridge arm switch G5 through the drive unit K33. Here, the second drive voltage H5-2 is the second secondary winding voltage of the third transformer T33.

[0082] In this embodiment, the control unit N31 is used to control the operation of the primary-side switch Q31 according to the received feedback voltage signal FB1. Specifically, the control unit N31 can adjust the duty cycle of the control signal it outputs to the primary-side switch Q31 based on the comparison result between the feedback voltage signal FB1 and at least one predetermined value.

[0083] In one embodiment, in response to a feedback voltage signal having a voltage value greater than or equal to a first predetermined value, the control unit N31 reduces the duty cycle of the output control signal.

[0084] In one embodiment, in response to a feedback voltage signal value being less than or equal to a second predetermined value, the control unit N31 increases the duty cycle of the output control signal. The second predetermined value is less than a first predetermined value.

[0085] In one embodiment, the control unit N31 controls the primary-side switch to turn off in response to a feedback voltage signal whose voltage value is greater than or equal to a third predetermined value. The third predetermined value is greater than a first predetermined value.

[0086] For ease of explanation, the following text will use... Figure 4 The following explanation will be based on the 1021 driving circuit. Figure 4 The connection and control methods of the components in the drive circuit 1022 of the drive circuit 102 are similar to those in the drive circuit 1021, and will not be described again. For example... Figure 5 The connection methods and control methods of the components in the drive circuits 1023 and 1024 shown are similar to those in the drive circuit 1024. Figure 4 The driving circuits 1021 and 1022 of the driving circuit 102 are similar and will not be described in detail here.

[0087] like Figure 4As shown, the first driving voltage H1-1 required by the upper bridge arm switch G1 is 15V, and the second driving voltage H1-2 required by the upper bridge arm switch G1 is -7.5V. If the driving voltage provided by the first driving unit K1 to the secondary winding of the first transformer T31 does not meet the above conditions, then the upper bridge arm switch G1 cannot be driven.

[0088] For ease of explanation, Taz represents the number of turns in the primary winding Ta, and Tdz represents the number of turns in the primary feedback winding Td. Correspondingly, the voltage at the same-name terminal of the primary feedback winding Td of the first transformer T31 is Vv = Vin / Taz*Tdz. Consequently, the voltage provided by the same-name terminal of the primary feedback winding Td of the first transformer T31, after being divided by resistors R32 and R33, is denoted as V0 by the voltage value of the feedback voltage signal FB1 received at the feedback input terminal of the control unit N31.

[0089] Understandably, if the voltage at the same-name terminal of the primary feedback winding Td of the first transformer T31 is greater than or equal to Vv, and the voltage of the feedback voltage signal FB1 is greater than or equal to V0, then the driving voltage provided by the first driving unit K1 to the secondary winding of the first transformer T31 meets the requirements of the upper bridge arm switch G1. Conversely, if the voltage at the same-name terminal of the primary feedback winding Td of the first transformer T31 is less than Vv, and the voltage of the feedback voltage signal FB1 is less than V0, then the driving voltage provided by the first driving unit K1 to the secondary winding of the first transformer T31 cannot meet the requirements of the upper bridge arm switch G1.

[0090] Correspondingly, in response to the feedback voltage signal FB1 being greater than or equal to a first predetermined value, the control unit N31 reduces the duty cycle of its output control signal. For example, after the control unit N31 outputs a control signal to the primary-side switch Q31 for a first duration T3, it stops outputting the control signal for a second duration T4. Where T3 + T4 = T, T3 < T1, and T4 > T2.

[0091] Correspondingly, in response to the feedback voltage signal FB1 being less than or equal to a second predetermined value, the control unit N31 increases the duty cycle of its output control signal. For example, after the control unit N31 outputs a control signal to the primary-side switch Q31 for a first duration T5, it stops outputting the control signal for a second duration T6. Where T5 + T6 = T, T5 > T1, and T6 < T2.

[0092] In this embodiment, the first predetermined value can be a voltage value greater than V0, and the second predetermined value can be a voltage value less than V0. When the voltage value of the feedback voltage signal FB1 is between the first and second predetermined values, the output voltage output by the secondary winding of the first transformer T31 can meet the requirements of the upper bridge arm switch G1; therefore, the control unit N31 does not need to adjust the duty cycle of its output control signal. When the voltage value of the feedback voltage signal FB1 is not between the first and second predetermined values, the output voltage output by the secondary winding of the first transformer T31 may not meet the requirements of the upper bridge arm switch G1; therefore, the control unit N31 can adjust the duty cycle of its output control signal.

[0093] like Figure 4 As shown, in the drive circuit 1021, the primary feedback windings Td of the first transformer T31, the second transformer T32, and the third transformer T33 are connected in parallel. Therefore, when the output voltages of the secondary windings of the first transformer T31, the second transformer T32, and the third transformer T33 meet the requirements, the voltage value of the feedback voltage signal FB1 is between a first predetermined value and a second predetermined value. Conversely, when the output voltage of any one of the secondary windings of the first transformer T31, the second transformer T32, and the third transformer T33 does not meet the requirements, the voltage value of the feedback voltage signal FB1 is not between the first and second predetermined values. The control unit N31 can then adjust the duty cycle of its output control signal to adjust the voltage values ​​of the drive voltages output by the first transformer T31, the second transformer T32, and the third transformer T33.

[0094] like Figure 5 As shown, in the drive circuit 1023, the primary feedback windings Td of the first transformer T31, the second transformer T32, and the third transformer T31 are connected in series. Therefore, when the output voltages of the secondary windings of the first transformer T31, the second transformer T32, and the third transformer T33 all meet the requirements, the voltage value of the feedback voltage signal FB1 is between the first and second predetermined values, and the control unit N31 does not adjust the duty cycle of its output control signal. Conversely, if the output voltage of any one of the secondary windings of the first transformer T31, the second transformer T32, and the third transformer T33 does not meet the requirements, the voltage value of the feedback voltage signal FB1 will not be between the first and second predetermined values, and the control unit N31 will adjust the duty cycle of its output control signal.

[0095] Understandably, a short circuit or open circuit in any of the three transformers—the first transformer T31, the second transformer T32, and the third transformer T33—can cause a high output drive voltage. The control unit N31 can detect this anomaly promptly based on the voltage feedback signal and adjust the duty cycle of the control signal accordingly. Specifically, the control unit N31 stops outputting control signals, controlling all three transformers to stop outputting drive voltage, thus providing overvoltage protection for the switching transistors driven by the three transformers.

[0096] Correspondingly, in response to the feedback voltage signal FB3 being greater than or equal to a third predetermined value, control unit N31 stops outputting control signals to primary-side switch Q31. Primary-side switch Q31 is turned off. The third predetermined value is greater than the first predetermined value. Correspondingly, if any of the first transformer T31, second transformer T32, and third transformer T33 experiences a short circuit or open circuit, primary-side switch Q31 is turned off, causing the first transformer T31, second transformer T32, and third transformer T33 to stop outputting drive voltage, thus achieving overvoltage protection for upper bridge arm switches G1, G3, and G5.

[0097] The motor controller 10 and drive circuit 102 provided in this embodiment can provide drive voltage to multiple switching transistors through a single drive circuit, eliminating the need for numerous control circuits and primary-side switches, thus reducing the number of components in the motor controller 10 and drive circuit 102 and lowering the complexity of the drive circuit 102. Furthermore, the three transformers in the motor controller 10 and drive circuit 102 provided in this embodiment are independently configured, reducing the complexity of the transformer winding structure, decreasing the circuit board area occupied by the drive circuit 102 and motor controller 10, reducing the required volume on the circuit board, and improving anti-interference performance, thereby reducing the cost of the drive circuit 102, motor controller 10, and the electric vehicle 1 in which they are located.

[0098] Furthermore, the motor controller 10 and drive circuit 102 provided in this embodiment output a voltage feedback signal to the control unit through the primary feedback winding of the transformer, enabling the control unit to control the operation of the primary switching transistor according to the voltage feedback signal. The control unit can adjust the duty cycle of the primary switching transistor according to the voltage feedback signal, thereby achieving self-equalization of the drive signals output by the secondary windings of the three transformers through voltage closed-loop control. This reduces the deviation between the voltage values ​​of the drive signals output by the secondary windings of the three transformers, ensuring the consistency of the voltage values ​​of the drive signals output by the secondary windings of the three transformers, thereby improving the performance of the drive circuit 102 and the motor controller 10.

[0099] In the foregoing embodiments, the method executed by the control unit provided in the embodiments of this application has been described. To implement the functions of the methods provided in the embodiments of this application, the control unit, as the execution subject, may include hardware structures and / or software modules, implementing the above functions in the form of hardware structures, software modules, or a combination of hardware structures and software modules. Whether a particular function is executed in the form of hardware structures, software modules, or a combination of hardware structures and software modules depends on the specific application and design constraints of the technical solution. It should be noted that the division of the various modules in the above device is merely a logical functional division; in actual implementation, they can be fully or partially integrated into a single physical entity, or physically separated. Furthermore, these modules can all be implemented in software through processing element calls; they can all be implemented in hardware; or some modules can be implemented in software through processing element calls, and some modules can be implemented in hardware. A separate processing element can be established, or it can be integrated into a chip in the above device. Alternatively, it can be stored in the memory of the above device as program code, and called and executed by a processing element of the above device. The implementation of other modules is similar. In addition, all or part of these modules can be integrated together, or they can be implemented independently. The processing element described herein can be an integrated circuit with signal processing capabilities. In implementation, each step or module of the above method can be completed through integrated logic circuits in the hardware of the processor element or through software instructions. For example, these modules can be one or more integrated circuits configured to implement the above method, such as one or more application-specific integrated circuits (ASICs), one or more digital signal processors (DSPs), or one or more field-programmable gate arrays (FPGAs). Furthermore, when a module is implemented by the processing element calling program code, the processing element can be a general-purpose processor, such as a central processing unit (CPU) or other processor capable of calling program code. Additionally, these modules can be integrated together as a system-on-a-chip (SOC).

[0100] In the above embodiments, the steps performed by the control device can be implemented entirely or partially through software, hardware, firmware, or any combination thereof. When implemented using software, it can be implemented entirely or partially in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments of this application are generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server or data center that integrates one or more available media. The available medium can be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., solid-state disk (SSD)). .

[0101] Those skilled in the art will understand that all or part of the steps of the above embodiments can be implemented by hardware related to program instructions. The aforementioned program can be stored in a computer-readable storage medium. When the program is executed, it performs the steps of the above method embodiments; and the aforementioned storage medium includes various media capable of storing program code, such as ROM, magnetic disk, or optical disk.

[0102] Those skilled in the art will understand that, for the purpose of illustrating the technical solution of this application, the embodiments of this application are described separately by functional modules, and the circuit devices in each module may partially or completely overlap, which is not intended to limit the scope of protection of this application.

[0103] Finally, it should be noted that 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 or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A driving circuit, characterized in that, It includes multiple transformers, primary-side switching transistors, and control units, among which: Each transformer's primary winding includes a primary main winding and a primary feedback winding. Each transformer's secondary winding outputs a driving voltage. One end of each primary main winding is connected to a power supply, and the other end is connected to one end of a primary switching transistor. At least one primary feedback winding provides a feedback voltage signal to the control unit. One primary winding corresponds to one secondary winding. The driving circuit provides multiple driving voltages to multiple switching transistors in the bridge arm circuit. Multiple primary feedback windings of the transformers are connected in series, and one end of a primary feedback winding of one transformer provides the feedback voltage signal to the control unit. The control unit is used to control the operation of the primary-side switching transistor according to the feedback voltage signal; The control unit includes a feedback signal input terminal, which receives a voltage feedback signal provided by at least one of the primary-side feedback windings via a voltage divider circuit. The voltage divider circuit includes two resistors and at least one diode, wherein: The two ends of one resistor are respectively connected to the feedback signal input terminal and one end of another resistor, the other end of the other resistor is grounded, the connection terminal of the two resistors is used to connect to the cathode of the at least one diode, and the anode of the at least one diode is used to receive the voltage feedback signal provided by the at least one primary-side feedback winding.

2. A motor controller, characterized in that, The motor controller includes a bridge arm circuit and a drive circuit as described in claim 1. The bridge arm circuit includes multiple switching transistor bridge arms, each of which includes an upper bridge arm switching transistor and a lower bridge arm switching transistor. The upper bridge arm switching transistor and the lower bridge arm switching transistor are both connected to the midpoint of the corresponding switching transistor bridge arm. The midpoint of the multiple switching transistor bridge arms is used to connect the motor windings of the drive motor. The drive circuit is used to provide multiple drive voltages to the multiple switching transistors of the bridge arm circuit.

3. The motor controller according to claim 2, characterized in that, The opposite-named terminal of the primary winding of each transformer is used to connect to the power supply, and the same-named terminal of the primary winding of each transformer is connected to one end of the primary switching transistor.

4. The motor controller according to claim 2, characterized in that, The primary feedback winding of one transformer provides the feedback voltage signal to the control unit at the same-name terminal, and the secondary feedback winding of one transformer is connected to the primary feedback winding of another transformer at the same-name terminal.

5. The motor controller according to any one of claims 2-4, characterized in that, Each of the transformers has two secondary windings, with the two ends of each secondary winding connected by a diode and a capacitor connected in series, and one end of one secondary winding connected to the other end of the other secondary winding.

6. The motor controller according to claim 5, characterized in that, One of the secondary sub-windings is connected to the positive terminal of the first diode, the negative terminal of the first diode is connected to one end of the first capacitor, and the other end of the first capacitor is connected to the opposite terminal of the secondary sub-winding. Another terminal of the secondary winding is connected to one end of a second capacitor, the other end of the second capacitor is connected to the positive terminal of a second diode, and the negative terminal of the second diode is connected to the terminal of one secondary winding. The opposite-named terminal of one secondary sub-winding is connected to the same-named terminal of the other secondary sub-winding.

7. The motor controller according to any one of claims 2-4 and 6, characterized in that, The secondary winding of each transformer is used to connect one of the switching transistors via a drive unit, the drive unit including a first input terminal, a second input terminal, and an output terminal, wherein: One end of one of the secondary windings of each transformer is used to connect to the first input terminal of the drive unit, one end of the other secondary winding is used to connect to the second input terminal of the drive unit, and the control terminal of the switching transistor is used to connect to the output terminal of the drive unit. The first input terminal and the output terminal of each drive unit are connected, and the secondary winding outputs a first drive voltage to the control terminal of the switch tube. The second input terminal and the output terminal of each drive unit are connected, and the secondary winding outputs a second drive voltage to the control terminal of the switch.

8. The motor controller according to any one of claims 2-4 and 6, characterized in that, The motor controller includes two drive circuits, wherein: One of the drive circuits is used to provide a plurality of drive voltages to a plurality of the upper bridge arm switches of the bridge arm circuit respectively; Another drive circuit is used to provide multiple drive voltages to the multiple lower bridge arm switches of the bridge arm circuit respectively.

9. The motor controller according to any one of claims 2-4 and 6, characterized in that, The primary-side switching transistor is periodically switched on and off alternately according to the control signal output by the control unit. The control unit is used for: The duty cycle of the control signal output by the control unit is adjusted based on the comparison result between the feedback voltage signal and at least one predetermined value.

10. The motor controller according to claim 9, characterized in that, The control unit is used for: In response to the feedback voltage signal having a voltage value greater than or equal to a first predetermined value, the duty cycle of the control signal output by the control unit is reduced; In response to the feedback voltage signal having a voltage value less than or equal to a second predetermined value, the duty cycle of the control signal output by the control unit is increased, wherein the second predetermined value is less than the first predetermined value.

11. A power device comprising a drive motor and a motor controller as described in any one of claims 2-10, the motor controller being configured to supply power to the drive motor.

12. An electric vehicle, comprising wheels, a drive motor, and a motor controller as claimed in any one of claims 2-10, the motor controller being configured to supply power to the drive motor, the drive motor being configured to receive the power from the motor controller and drive the wheels.

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