Power supply circuit and motor controller

Abstract

The application discloses a power supply circuit and a motor controller. The power supply circuit comprises processing circuitry, which outputs a control signal; a plurality of conversion circuits, each of which is independent of each other, wherein the conversion circuit is connected with the processing circuitry, is used for accessing a power supply voltage, and converts the power supply voltage into a power supply voltage under the control of the control signal; a primary side of one of the plurality of conversion circuits is provided with a feedback winding, and the primary sides of the rest of the conversion circuits are not provided with the feedback winding; the feedback winding is connected with a feedback pin of the processing circuitry; and a secondary side of each of the conversion circuits is provided with an analog load. In this way, the production cost of the power supply circuit can be reduced.

Description

Technical Field

[0001] This application relates to the field of vehicle motor control technology, and in particular to power supply circuits and motor controllers. Background Technology

[0002] Vehicles such as automobiles, electric vehicles, and new energy vehicles, especially electric vehicles, have become a popular mode of transportation. The power supply circuit of the electric vehicle motor controller is an important component of the motor controller. It requires multiple stable power supply output terminals to ensure the normal and stable operation of the motor controller. However, in related technologies, power supply circuits with multiple power supply output terminals are too bulky, which is not conducive to the layout of printed circuit boards (PCBs) and the space arrangement in the controller cabinet. In order to reduce the space volume of the power supply circuit, the related technical solutions will significantly increase the production cost of the power supply circuit. Moreover, power supply circuits with multiple power supply output terminals have poor stability, which limits the upgrade and improvement of the motor controller, restricts the performance of the motor controller to a certain extent, and increases the production cost of the motor controller. Utility Model Content

[0003] This application provides a power supply circuit and a motor controller, which can reduce the production cost of the power supply circuit.

[0004] To solve the above-mentioned technical problems, one technical solution adopted in this application is: providing a power supply circuit for a motor controller, the power supply circuit including: a processing circuit for outputting control signals; multiple conversion circuits, each conversion circuit being independent of each other, wherein the conversion circuit is connected to the processing circuit for receiving power supply voltage and converting the power supply voltage into a supply voltage under the control of the control signal; one of the multiple conversion circuits has a feedback winding on its primary side, while the other conversion circuits do not have feedback windings on their primary sides, the feedback winding is connected to the feedback pin of the processing circuit, and each conversion circuit has an analog load on its secondary side.

[0005] Each conversion circuit has a primary winding on its primary side, which is connected to the processing circuit and used to receive the power supply voltage. The secondary side of each conversion circuit has a secondary winding, which is coupled to the primary winding and connected to an analog load to convert the power supply voltage into the supply voltage.

[0006] The power supply circuit also includes multiple voltage regulator circuits connected to the corresponding secondary windings and analog loads. The voltage regulator circuits are used to adjust the power supply voltage to the drive voltage of the motor controller.

[0007] The voltage regulator circuit includes: a Zener diode, whose first signal terminal is connected to the first signal terminal of the secondary winding, and whose second signal terminal is connected to the motor controller; a first resistor, whose first signal terminal is connected to the second signal terminal of the Zener diode, and whose second signal terminal is connected to the second signal terminal of the secondary winding; a first capacitor, whose first signal terminal is connected to the first signal terminal of the Zener diode, and whose second signal terminal is connected to the second signal terminal of the Zener diode; and a second capacitor, whose first signal terminal is connected to the second signal terminal of the Zener diode, and whose second signal terminal is connected to the second signal terminal of the first resistor.

[0008] The power supply circuit also includes a clamping circuit, whose first signal terminal is connected to the first signal terminal of the primary winding, the second signal terminal of the clamping circuit is connected to the second signal terminal of the primary winding and the processing circuit respectively, and the third signal terminal of the clamping circuit is used to connect the power supply voltage so that the power supply voltage is connected to the conversion circuit after passing through the clamping circuit.

[0009] The clamping circuit includes: a third capacitor, whose first signal terminal serves as the third signal terminal of the clamping circuit; a second resistor, whose first signal terminal is connected to the first signal terminal of the third capacitor and the first signal terminal of the primary winding, and whose second signal terminal is connected to the second signal terminal of the third capacitor; and a diode, whose first signal terminal is connected to the second signal terminal of the second resistor, and whose second signal terminal is connected to the primary winding and the processing circuit.

[0010] The processing circuit includes: a control chip; and an adjustment circuit connected to the control chip and the conversion circuit. The control chip generates a control signal, and the adjustment circuit adjusts the conversion circuit based on the control signal.

[0011] The regulating circuit includes: a switching transistor, whose first signal terminal is connected to the conversion circuit, and whose control terminal is connected to the control chip; and a third resistor, whose first signal terminal is connected to the second signal terminal of the switching transistor, and whose second signal terminal is grounded.

[0012] In this circuit, the analog load on the secondary side has the same resistance value.

[0013] To solve the above-mentioned technical problems, another technical solution adopted in this application is to provide a motor controller, including the power supply circuit provided by the above-mentioned technical solution.

[0014] The power supply circuit and motor controller provided in this application have a feedback winding on the primary side of only one of the multiple conversion circuits, while the primary side of the other conversion circuits does not have a feedback winding. In this way, the processing circuit only needs to receive the feedback signal provided by a single feedback winding, eliminating the need for additional detection feedback circuits. This reduces the production cost of the power supply circuit. Furthermore, a simulated load is provided on the secondary side of each conversion circuit, ensuring that the loads of the two conversion circuits without feedback windings and the total load of the conversion circuit with feedback windings remain at similar levels even when the actual load fluctuates. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0016] Figure 1 This is a schematic diagram of the circuit structure of an embodiment of the power supply circuit provided in this application;

[0017] Figure 2 yes Figure 1 A schematic diagram of the circuit structure of one embodiment of the processing circuit and one embodiment of the filtering circuit;

[0018] Figure 3 This is a schematic diagram of an embodiment of the motor controller provided in this application. Detailed Implementation

[0019] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. It is understood that the specific embodiments described herein are only for explaining this application and not for limiting it. Furthermore, it should be noted that, for ease of description, only the parts related to this application are shown in the accompanying drawings, not all structures. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0020] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0021] Vehicles such as automobiles, electric vehicles, and new energy vehicles, especially electric vehicles, have become a popular mode of transportation. The power supply circuit of the electric vehicle motor controller is an important component of the motor controller. It requires multiple stable power supply output terminals to ensure the normal and stable operation of the motor controller. However, in related technologies, power supply circuits with multiple power supply output terminals are too bulky, which is not conducive to the layout of printed circuit boards (PCBs) and the space arrangement in the controller cabinet. In order to reduce the space volume of the power supply circuit, the related technical solutions will significantly increase the production cost of the power supply circuit. Moreover, power supply circuits with multiple power supply output terminals have poor stability, which limits the upgrade and improvement of the motor controller, restricts the performance of the motor controller to a certain extent, and increases the production cost of the motor controller.

[0022] Based on this, this application proposes that only one of the multiple conversion circuits has a feedback winding on its primary side, while the other conversion circuits do not have feedback windings on their primary sides. This way, the processing circuit only needs to receive the feedback signal provided by a single feedback winding, eliminating the need for additional detection feedback circuits, thus reducing the production cost of the power supply circuit. Furthermore, a simulated load is provided on the secondary side of each conversion circuit, ensuring that the loads of the two conversion circuits without feedback windings and the overall load of the conversion circuit with feedback windings remain at similar levels even when the actual load fluctuates. See any of the following embodiments for details.

[0023] See Figure 1 , Figure 1 This is a schematic diagram of the circuit structure of an embodiment of the power supply circuit provided in this application. This application provides a power supply circuit 10 for a motor controller, wherein the motor controller is a motor controller for a pure electric vehicle, and the power supply circuit 10 of this application can also be used for controllers of other vehicles, and is not limited to motor controllers. The power supply circuit 10 includes:

[0024] Processing circuit 100, multiple conversion circuits, such as Figure 1 The first conversion circuit 201, the second conversion circuit 202, and the third conversion circuit 203, the feedback winding 300, and the analog load, such as Figure 1 The first simulated load 501, the second simulated load 502, the third simulated load 503, the fourth simulated load 504, the fifth simulated load 505, and the sixth simulated load 506.

[0025] The processing circuit 100 outputs control signals.

[0026] The first conversion circuit 201, the second conversion circuit 202, and the third conversion circuit 203 are independent of each other. The first conversion circuit 201, the second conversion circuit 202, and the third conversion circuit 203 are connected to the processing circuit 100 and are used to receive the power supply voltage V1 and convert the power supply voltage V1 into the supply voltage under the control of the control signal.

[0027] The primary side of the first conversion circuit 201 is provided with a feedback winding 300. The primary side of the second conversion circuit 202 and the third conversion circuit 203 does not have a feedback winding 300. The feedback winding 300 is connected to the feedback pin of the processing circuit 100. The secondary side of the first conversion circuit 201 is provided with a first analog load 501 and a second analog load 502. The secondary side of the second conversion circuit 202 is provided with a third analog load 503 and a fourth analog load 504. The secondary side of the third conversion circuit 203 is provided with a fifth analog load 505 and a sixth analog load 506. For example, the first analog load 501 is composed of resistors R1 and R2; the second analog load 502 is composed of resistors R4 and R5; the third analog load 503 is composed of resistors R7 and R8; the fourth analog load 504 is composed of resistors R10 and R11; the fifth analog load 505 is composed of resistors R13 and R14; and the sixth analog load 506 is composed of resistors R16 and R17.

[0028] The feedback winding 300 is used to generate a feedback signal FK; wherein, the processing circuit 100 adjusts the control signal based on the feedback signal FK.

[0029] In this embodiment, the power supply circuit 10 includes multiple independent first conversion circuits 201, second conversion circuits 202, and third conversion circuits 203. Each of the first conversion circuits 201, 202, and 203 can convert the power supply voltage V1 into a supply voltage based on a control signal. Furthermore, the circuit structures of each circuit are independent, meaning that each conversion circuit does not share the same circuit structure with another. The processing circuit 100 outputs a control signal to control the first conversion circuits 201, 202, and 203 to convert the power supply voltage V1 into multiple corresponding supply voltages, so that the power supply circuit 10 simultaneously has multiple power supply output terminals, thereby effectively meeting the drive standards of the motor controller. Furthermore, the same processing circuit 100 is used to simultaneously control the first conversion circuit 201, the second conversion circuit 202, and the third conversion circuit 203, thereby reducing the number of processing circuits 100, simplifying the circuit structure, and reducing the production cost of the power supply circuit 10. In addition, the circuit structures of the first conversion circuit 201, the second conversion circuit 202, and the third conversion circuit 203 are independent of each other, which facilitates the layout of the power supply circuit 10 on the circuit board, i.e., the control arrangement in the motor controller housing, thereby effectively reducing the space volume of the power supply circuit 10 in the motor controller and improving space utilization.

[0030] In this embodiment, a feedback winding 300 is provided only on the primary side of the first conversion circuit 201, while no feedback winding 300 is provided on the primary side of the second conversion circuit 202 and the third conversion circuit 203. Thus, the processing circuit 100 only needs to receive the feedback signal provided by a single feedback winding 300, without the need for an additional detection feedback circuit, which can reduce the production cost of the power supply circuit 10. Furthermore, simulated loads (501 / 502 / 503 / 504 / 505 / 506) are provided on the secondary side of the first conversion circuit 201, the second conversion circuit 202, and the third conversion circuit 203, ensuring that the loads of the second conversion circuit 202 and the third conversion circuit 203 without feedback winding 300 and the overall load of the first conversion circuit 201 with feedback winding 300 can be maintained at similar levels even when the actual load fluctuates.

[0031] In some embodiments, the first conversion circuit 201 is described as an example: The first conversion circuit 201 includes a primary winding (not shown), a feedback winding 300, and a secondary winding (not shown). The primary winding is connected to the processing circuit 100 and is used to receive the power supply voltage V1; the secondary winding is coupled to the primary winding and is connected to a simulated load to convert the power supply voltage V1 into a supply voltage. In some embodiments, the simulated load may be composed of a resistor, such as a resistor connected in parallel to the secondary winding. For example, the first conversion circuit 201 includes a primary winding (not shown), a first secondary winding, and a second secondary winding. The first secondary winding is coupled to the primary winding and is connected to a first simulated load 501. The second secondary winding is coupled to the primary winding and is connected to a second simulated load 502.

[0032] In some embodiments, the second conversion circuit 202 is described as an example: The second conversion circuit 202 includes a primary winding (not shown) and a secondary winding (not shown). The primary winding is connected to the processing circuit 100 and is used to receive the power supply voltage V1; the secondary winding is coupled to the primary winding and is connected to an analog load to convert the power supply voltage V1 into a supply voltage. In some embodiments, the analog load may be composed of a resistor, such as a resistor connected in parallel to the secondary winding. For example, the second conversion circuit 202 includes a primary winding (not shown), a third secondary winding, and a fourth secondary winding. The third secondary winding is coupled to the primary winding and is connected to a third analog load 503. The fourth secondary winding is coupled to the primary winding and is connected to a fourth analog load 504.

[0033] In some embodiments, the third conversion circuit 203 is described as an example: The third conversion circuit 203 includes a primary winding (not shown) and a secondary winding (not shown). The primary winding is connected to the processing circuit 100 and is used to receive the power supply voltage V1; the secondary winding is coupled to the primary winding and is connected to an analog load to convert the power supply voltage V1 into a supply voltage. In some embodiments, the analog load may be composed of a resistor, such as a resistor connected in parallel to the secondary winding. For example, the third conversion circuit 203 includes a primary winding (not shown), a fifth secondary winding, and a sixth secondary winding. The fifth secondary winding is coupled to the primary winding and is connected to a fifth analog load 505. The sixth secondary winding is coupled to the primary winding and is connected to a sixth analog load 506.

[0034] In some embodiments, the first conversion circuit 201, the second conversion circuit 202, and the third conversion circuit 203 are transformers, which control the primary winding and the secondary winding to convert the power supply voltage V1 into the corresponding supply voltage through a corresponding conversion relationship.

[0035] For example Figure 1As shown, in this embodiment, the power supply circuit 10 is provided with a first conversion circuit 201, a second conversion circuit 202 and a third conversion circuit 203. The primary side of the first conversion circuit 201 is provided with a feedback winding 300, which is correspondingly provided with the feedback pin of the processing circuit 100.

[0036] See further Figure 1 The power supply circuit 10 also includes multiple voltage regulator circuits (not shown in the figure). The voltage regulator circuits are connected to the corresponding secondary windings and the analog load. The voltage regulator circuits are used to adjust the power supply voltage to the drive voltage of the motor controller.

[0037] In some embodiments, the voltage regulator circuit adjusts the supply voltage output by the first conversion circuit 201, the second conversion circuit 202, and the third conversion circuit 203 to convert the voltage regulator circuit into the driving voltage of the voltage controller. The driving voltage includes a positive driving voltage V2 and a negative driving voltage V3. Using a voltage regulator circuit to adjust the supply voltage can effectively improve the stability of the driving voltage. For example, in this embodiment, the power supply voltage V1 is positive 12V. After conversion by the first conversion circuit 201, the second conversion circuit 202, and the third conversion circuit 203, and adjustment by the voltage regulator circuit, the positive driving voltage V2 is 15V and the negative driving voltage V3 is 8V.

[0038] See further Figure 1 The voltage regulator circuit corresponding to the first secondary winding of the first conversion circuit 201 includes: a Zener diode W1, a resistor R3, a capacitor C1, and a capacitor C2. The first signal terminal of the Zener diode W1 is connected to the first signal terminal of the first secondary winding, and the second signal terminal of the Zener diode W1 is connected to the motor controller. The first signal terminal of the resistor R3 is connected to the second signal terminal of the Zener diode W1, and the second signal terminal of the resistor R3 is connected to the second signal terminal of the first secondary winding. The first signal terminal of the capacitor C1 is connected to the first signal terminal of the Zener diode W1, and the second signal terminal of the capacitor C1 is connected to the second signal terminal of the Zener diode W1. The first signal terminal of the capacitor C2 is connected to the second signal terminal of the Zener diode W1, and the second signal terminal of the capacitor C2 is connected to the second signal terminal of the resistor R3. The voltage regulator circuit based on the above configuration can stably regulate the supply voltage to output a stable drive voltage. A rectifier diode D2 is also provided between the first secondary winding of the first conversion circuit 201 and the voltage regulator circuit. The supply voltage is rectified by the rectifier diode D2 to output the supply voltage. For specific circuit connections, see [link to circuit diagram]. Figure 1 This will not be elaborated upon further here.

[0039] See further Figure 1The voltage regulator circuit corresponding to the second secondary winding of the first conversion circuit 201 includes: a Zener diode W2, a resistor R6, a capacitor C3, and a capacitor C4. The first signal terminal of the Zener diode W2 is connected to the first signal terminal of the second secondary winding, and the second signal terminal of the Zener diode W2 is connected to the motor controller. The first signal terminal of the resistor R6 is connected to the second signal terminal of the Zener diode W2, and the second signal terminal of the resistor R6 is connected to the second signal terminal of the first secondary winding. The first signal terminal of the capacitor C3 is connected to the first signal terminal of the Zener diode W2, and the second signal terminal of the capacitor C3 is connected to the second signal terminal of the Zener diode W1. The first signal terminal of the capacitor C4 is connected to the second signal terminal of the Zener diode W2, and the second signal terminal of the capacitor C4 is connected to the second signal terminal of the resistor R6. The voltage regulator circuit based on the above configuration can stably regulate the supply voltage to output a stable drive voltage. A rectifier diode D3 is also provided between the second secondary winding of the first conversion circuit 201 and the voltage regulator circuit. The supply voltage is rectified by the rectifier diode D3 to output the supply voltage. For specific circuit connections, see [link to circuit diagram]. Figure 1 This will not be elaborated upon further here.

[0040] See further Figure 1 The voltage regulator circuit corresponding to the third secondary winding of the second conversion circuit 202 includes: a Zener diode W3, a resistor R9, a capacitor C5, and a capacitor C6. The first signal terminal of the Zener diode W3 is connected to the first signal terminal of the third secondary winding, and the second signal terminal of the Zener diode W3 is connected to the motor controller. The first signal terminal of the resistor R9 is connected to the second signal terminal of the Zener diode W3, and the second signal terminal of the resistor R9 is connected to the second signal terminal of the first secondary winding. The first signal terminal of the capacitor C5 is connected to the first signal terminal of the Zener diode W3, and the second signal terminal of the capacitor C5 is connected to the second signal terminal of the Zener diode W3. The first signal terminal of the capacitor C6 is connected to the second signal terminal of the Zener diode W3, and the second signal terminal of the capacitor C6 is connected to the second signal terminal of the resistor R9. The voltage regulator circuit based on the above configuration can stably regulate the supply voltage to output a stable drive voltage. A rectifier diode D4 is also provided between the third secondary winding of the second conversion circuit 202 and the voltage regulator circuit. The supply voltage is rectified by the rectifier diode D4 to output the supply voltage. For specific circuit connections, see [link to circuit diagram]. Figure 1 This will not be elaborated upon further here.

[0041] See further Figure 1The voltage regulator circuit corresponding to the fourth secondary winding of the second conversion circuit 202 includes: a Zener diode W4, a resistor R12, a capacitor C7, and a capacitor C8. Specifically, the first signal terminal of the Zener diode W4 is connected to the first signal terminal of the fourth secondary winding, and the second signal terminal of the Zener diode W4 is connected to the motor controller; the first signal terminal of the resistor R12 is connected to the second signal terminal of the Zener diode W4, and the second signal terminal of the resistor R12 is connected to the second signal terminal of the first secondary winding; the first signal terminal of the capacitor C7 is connected to the first signal terminal of the Zener diode W4, and the second signal terminal of the capacitor C7 is connected to the second signal terminal of the Zener diode W4; the first signal terminal of the capacitor C8 is connected to the second signal terminal of the Zener diode W4, and the second signal terminal of the capacitor C8 is connected to the second signal terminal of the resistor R12. Based on the above configuration, the voltage regulator circuit can stably regulate the supply voltage to output a stable drive voltage. A rectifier diode D5 is also installed between the fourth secondary winding of the second conversion circuit 202 and the voltage regulator circuit. The supply voltage is rectified by the rectifier diode D5 to output the supply voltage. For specific circuit connections, please refer to [link to circuit diagram]. Figure 1 This will not be elaborated upon further here.

[0042] See further Figure 1 The voltage regulator circuit corresponding to the fifth secondary winding of the third conversion circuit 203 includes: a Zener diode W5, a resistor R15, a capacitor C9, and a capacitor C10. Specifically, the first signal terminal of the Zener diode W5 is connected to the first signal terminal of the fifth secondary winding, and the second signal terminal of the Zener diode W5 is connected to the motor controller; the first signal terminal of the resistor R15 is connected to the second signal terminal of the Zener diode W5, and the second signal terminal of the resistor R15 is connected to the second signal terminal of the first secondary winding; the first signal terminal of the capacitor C9 is connected to the first signal terminal of the Zener diode W5, and the second signal terminal of the capacitor C9 is connected to the second signal terminal of the Zener diode W5; the first signal terminal of the capacitor C10 is connected to the second signal terminal of the Zener diode W5, and the second signal terminal of the capacitor C10 is connected to the second signal terminal of the resistor R15. Based on the above configuration, the voltage regulator circuit can stably regulate the supply voltage to output a stable drive voltage. A rectifier diode D6 is also installed between the fifth secondary winding of the third conversion circuit 203 and the voltage regulator circuit. The supply voltage is rectified by the rectifier diode D6 to output the supply voltage. For specific circuit connections, please refer to [link to circuit diagram]. Figure 1 This will not be elaborated upon further here.

[0043] See further Figure 1The voltage regulator circuit corresponding to the sixth secondary winding of the third conversion circuit 203 includes: a Zener diode W6, a resistor R18, a capacitor C11, and a capacitor C12. Specifically, the first signal terminal of the Zener diode W6 is connected to the first signal terminal of the sixth secondary winding, and the second signal terminal of the Zener diode W6 is connected to the motor controller; the first signal terminal of the resistor R18 is connected to the second signal terminal of the Zener diode W6, and the second signal terminal of the resistor R18 is connected to the second signal terminal of the first secondary winding; the first signal terminal of the capacitor C11 is connected to the first signal terminal of the Zener diode W1, and the second signal terminal of the capacitor C11 is connected to the second signal terminal of the Zener diode W6; the first signal terminal of the capacitor C12 is connected to the second signal terminal of the Zener diode W6, and the second signal terminal of the capacitor C12 is connected to the second signal terminal of the resistor R18. Based on the above configuration, the voltage regulator circuit can stably regulate the supply voltage to output a stable drive voltage. A rectifier diode D7 is also installed between the sixth secondary winding of the third conversion circuit 203 and the voltage regulator circuit. The supply voltage is rectified by the rectifier diode D7 to output the supply voltage. For specific circuit connections, please refer to [link to circuit diagram]. Figure 1 This will not be elaborated upon further here.

[0044] Optionally, the power supply circuit 10 further includes a clamping circuit 400. The first signal terminal of the clamping circuit 400 is connected to the first signal terminal of the primary winding of the first conversion circuit 201, the second conversion circuit 202, and the third conversion circuit 203. The second signal terminal of the clamping circuit 400 is connected to the second signal terminal SW of the primary winding of the first conversion circuit 201, the second conversion circuit 202, and the third conversion circuit 203, and the processing circuit 100, respectively. The third signal terminal of the clamping circuit 400 is used to connect the power supply voltage V1, so that the power supply voltage V1 is connected to the conversion circuit 200 after passing through the clamping circuit 400.

[0045] Specifically, the first signal terminal of the clamping circuit 400 is connected to the first signal terminal of the primary winding of the first conversion circuit 201, the second conversion circuit 202, and the third conversion circuit 203. The second signal terminal of the clamping circuit 400 is connected to the second signal terminal SW of the primary winding of the first conversion circuit 201, the second conversion circuit 202, and the third conversion circuit 203, and the adjustment terminal of the processing circuit 100, respectively. The third signal terminal of the clamping circuit 400 is connected to the power supply voltage V1. Based on this, the clamping circuit 400 can prevent the conversion signal from producing a sharp signal without changing the conversion signal of the conversion circuit 200, thereby effectively protecting the processing circuit 100 and extending the life of the power supply circuit 10.

[0046] Optionally, the clamping circuit 400 includes: capacitor C15, resistor R17, and diode D1. For specific circuit connections, please refer to [link / reference]. Figure 1The first signal terminal of capacitor C15 serves as the third signal terminal of clamping circuit 400. The first signal terminal of resistor R17 is connected to the first signal terminal of capacitor C15 and the first signal terminal of primary winding, respectively. The second signal terminal of resistor R17 is connected to the second signal terminal of capacitor C15. The first signal terminal of diode D1 is connected to the second signal terminal of resistor R17. The second signal terminal of diode D1 serves as the second signal terminal of clamping circuit 400 and is connected to primary winding and processing circuit 100, respectively.

[0047] Optionally, such as Figure 2 As shown, Figure 2 yes Figure 1 The diagram illustrates the circuit structures of one embodiment of the processing circuit and one embodiment of the filtering circuit. The processing circuit 100 includes a control chip 110 and an adjustment circuit 120. The adjustment circuit 120 is connected to the control chip 110 and a first conversion circuit 201, a second conversion circuit 202, and a third conversion circuit 203. The control chip 110 generates control signals, and the adjustment circuit 120 adjusts the first conversion circuit 201, the second conversion circuit 202, and the third conversion circuit 203 based on these control signals.

[0048] Specifically, the adjustment circuit 120 includes a switching transistor Q1 and a resistor R26. The first signal terminal of the switching transistor Q1 serves as the adjustment terminal of the processing circuit 100 and is connected to the first conversion circuit 201, the second conversion circuit 202, and the third conversion circuit 203. That is, the first signal terminal of the switching transistor Q1 is connected to the second signal terminal SW of the primary winding of the first conversion circuit 201, the second conversion circuit 202, and the third conversion circuit 203. The control terminal of the switching transistor Q1 is connected to the control chip 110. The first signal terminal of the resistor R26 is connected to the second signal terminal of the switching transistor Q1, and the second signal terminal of the resistor R26 is grounded. The adjustment circuit 120 also includes resistors R24, R10, and R25. The circuit elements in the adjustment circuit 120 are arranged according to... Figure 2 The circuit relationship shown is connected to the corresponding port in the control chip 110. Based on this, the control chip 110 controls the first signal terminal and the second signal terminal of the switch Q1 to conduct at the corresponding frequency, so that the first conversion circuit 201, the second conversion circuit 202 and the third conversion circuit 203 convert the power supply voltage V1 into the corresponding supply voltage.

[0049] Optionally, the power supply circuit 10 further includes a filter circuit (not shown). The filter circuit is connected to the processing circuit 100. Specifically, the filter circuit is located between the control chip 110 and the feedback winding 300 to filter the feedback signal FK, thereby effectively improving the stability of the power supply circuit 10. See also Figure 2 As shown, the filter circuit includes resistors R22 and R23 and capacitor C18, which... Figure 2 The circuit connections shown correspond to the ports in the control chip 110. The power supply circuit 10 also includes capacitors C16 and C17, resistors R21 and R20, as detailed below. Figure 2 Capacitor C16, capacitor C17, resistor R21 and resistor R20 Figure 2 The connection shown is connected to the control chip 110 to ensure that the control chip 110 can stably implement the above control functions.

[0050] Optionally, see Figure 1 and Figure 2 The power supply circuit 10 also includes capacitors C13 and C14, which are based on... Figure 1 The circuit connection shown is set before the power supply capacitor is connected to the processing circuit 100 and the clamping circuit 400 to form a filtering circuit, so as to filter the power supply voltage V1 before it is connected to the processing circuit 100 and the clamping circuit 400.

[0051] further, Figure 1 The overall control strategy of the power supply circuit 10 is a combination of primary-side feedback control of a single transformer and open-loop control of the other two transformers. The processing circuit 100 acquires the 12V_REF output from the feedback winding 300. The feedback 12V_REF signal is input to the control chip 110 for closed-loop feedback adjustment through two voltage divider resistors R22 and R23. The turns ratio of the coil windings between pins 1 and 2, 3 and 4, 5 and 6, and 7 and 8 of the first conversion circuit 201 is 3:9:9:3. The output voltage from pins 5 and 6 and 7 and 8 of the secondary winding of the first conversion circuit 201 is rectified by rectifier diodes D2 and D3 to 23V. The 23V output voltage is then divided into a 15V positive drive voltage (V2) and a -8V negative drive voltage (V3) for driving the IGBT module by 15V Zener diodes W1 and W2. The second conversion circuit 202 and the third conversion circuit 203 are similar and will not be described in detail.

[0052] In addition, the first conversion circuit 201 should be placed on the circuit board as close as possible to the middle of the second conversion circuit 202 and the third conversion circuit 203, so that the second conversion circuit 202 and the third conversion circuit 203 and the first conversion circuit 201 have similar loop lengths.

[0053] See Figure 3 , Figure 3 This is a schematic diagram of an embodiment of the motor controller provided in this application. The motor controller 20 includes a power supply circuit 10. The power supply circuit 10 can be any of the power supply circuits described in the above embodiments. The motor controller 20 is applied to electric vehicles, but can also be applied to other technical fields.

[0054] In the several embodiments provided in this application, it should be understood that the disclosed methods and devices can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For instance, the division of circuits or units is merely a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed.

[0055] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment, depending on actual needs.

[0056] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0057] The above description is merely an embodiment of this application and does not limit the patent scope of this application. Any equivalent structural or procedural changes made based on the description and drawings of this application, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A power supply circuit, characterized in that, For a motor controller, the power supply circuit includes: The processing circuit outputs control signals; Multiple conversion circuits, each of which is independent of the others, wherein each conversion circuit is connected to the processing circuit and is used to receive a power supply voltage and convert the power supply voltage into a supply voltage under the control of the control signal; One of the multiple conversion circuits has a feedback winding on its primary side, while the other conversion circuits do not have the feedback winding on their primary sides. The feedback winding is connected to the feedback pin of the processing circuit, and each conversion circuit has an analog load on its secondary side.

2. The power supply circuit according to claim 1, characterized in that, The primary side of each of the aforementioned conversion circuits includes: The primary winding is connected to the processing circuit and is used to connect to the power supply voltage; Each of the aforementioned conversion circuits includes the following secondary side: The secondary winding, coupled to the primary winding and connected to the simulated load, converts the power supply voltage into the supply voltage.

3. The power supply circuit according to claim 2, characterized in that, The power supply circuit also includes multiple voltage regulator circuits connected to the corresponding secondary winding and the simulated load. The voltage regulator circuits are used to adjust the power supply voltage to the drive voltage of the motor controller.

4. The power supply circuit according to claim 3, characterized in that, The voltage regulator circuit includes: A Zener diode, the first signal terminal of which is connected to the first signal terminal of the secondary winding, and the second signal terminal of which is used to connect to the motor controller; The first resistor has its first signal terminal connected to the second signal terminal of the Zener diode, and the second signal terminal of the first resistor is connected to the second signal terminal of the secondary winding. A first capacitor has its first signal terminal connected to the first signal terminal of the Zener diode, and its second signal terminal is connected to the second signal terminal of the Zener diode. The second capacitor has its first signal terminal connected to the second signal terminal of the Zener diode, and its second signal terminal is connected to the second signal terminal of the first resistor.

5. The power supply circuit according to claim 2, characterized in that, The power supply circuit also includes: The clamping circuit has a first signal terminal connected to the first signal terminal of the primary winding, a second signal terminal connected to the second signal terminal of the primary winding and the processing circuit, and a third signal terminal connected to the power supply voltage so that the power supply voltage is connected to the conversion circuit after passing through the clamping circuit.

6. The power supply circuit according to claim 5, characterized in that, The clamping circuit includes: The first signal terminal of the third capacitor serves as the third signal terminal of the clamping circuit. The first signal terminal of the second resistor is connected to the first signal terminal of the third capacitor and the first signal terminal of the primary winding, respectively, and the second signal terminal of the second resistor is connected to the second signal terminal of the third capacitor. A diode, the first signal terminal of which is connected to the second signal terminal of the second resistor, and the second signal terminal of the diode is connected to the primary winding and the processing circuit respectively.

7. The power supply circuit according to claim 1, characterized in that, The processing circuit includes: Control chip; An adjustment circuit is connected to the control chip and the conversion circuit; The control chip generates the control signal, and the adjustment circuit adjusts the conversion circuit based on the control signal.

8. The power supply circuit according to claim 7, characterized in that, The regulating circuit includes: A switching transistor, the first signal terminal of which is connected to the conversion circuit, and the control terminal of which is connected to the control chip; The third resistor has its first signal terminal connected to the second signal terminal of the switching transistor, and the second signal terminal of the third resistor is grounded.

9. The power supply circuit according to claim 1, characterized in that, The analog loads on the secondary side of each of the aforementioned conversion circuits have the same resistance value.

10. A motor controller, characterized in that, Includes the power supply circuit described in any one of claims 1-9.

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