Power protection circuit for motor controller and vehicle

Abstract

Disclosed in the present invention are a power protection circuit for a motor controller and a vehicle. The circuit (100) comprises: a voltage conversion module (110), which is connected to a high-voltage battery and configured to respond to a conversion instruction and convert high-voltage power into low-voltage power; a power processing module (120), which is separately connected to the voltage conversion module (110) and a low-voltage battery, and used for filtering the low-voltage power; a voltage stabilization module (130), used for performing voltage stabilization processing on the filtered low-voltage power, and outputting a stable voltage; a protection module (140), used for performing abnormality monitoring on the stable voltage, and when the monitoring result is Normal, outputting the stable voltage to a drive bridge for power supply; and a controller (150), which is separately connected to the voltage conversion module (110), the voltage stabilization module (130) and the protection module (140), and configured to respond to an abnormality signal of the voltage stabilization module (130) and an abnormality signal of the protection module (140).

Description

Power supply protection circuit of motor controller and vehicle

[0001] Cross-reference to related applications

[0002] The present disclosure claims priority to the Chinese patent application No. 202421985184.7, filed on August 15, 2024, entitled "Power supply protection circuit of motor controller and vehicle", the entire content of which is incorporated herein by reference. TECHNICAL FIELD

[0003] The present disclosure relates to the technical field of vehicles, and in particular to a power supply protection circuit of a motor controller and a vehicle. BACKGROUND

[0004] With the increasing demand of consumers for new energy vehicles, motor controllers are widely used in new energy vehicle drive control systems. The motor controller is one of the most core components in a new energy vehicle, and the power supply reliability design requirement of the motor controller circuit board is increasingly high. The reliability of the low-voltage power supply protection scheme of the control board of the motor controller is very important for the entire motor controller.

[0005] In the related art, the low-voltage power supply protection scheme is directed to the low-voltage input power supply of the control board, most of which do not perform voltage stabilization processing on the low-voltage input power supply, and do not perform self-protection on voltage or current abnormalities of the stabilized power supply. The protection is not timely, a single module failure may cause a full circuit failure, or a short-time recoverable failure. Due to the incomplete protection, the entire circuit board may not be able to resume work. In particular, for the low-voltage power supply, low-voltage power supply abnormalities may cause the motor controller control board and the drive board to fail to work normally, increase the after-sales maintenance cost of the electric control controller, and may affect the user experience, which may lead to an increase in user complaints.

[0006] DISCLOSURE

[0007] The present disclosure aims to at least solve one of the technical problems in the related art. To this end, the first object of the present disclosure is to provide a power supply protection circuit of a motor controller. The voltage abnormality and current abnormality self-checking capabilities of the voltage stabilization module and the protection module can achieve self-protection when the low-voltage power supply protection module is abnormal, improve the timeliness of protection, avoid a single module failure causing a full circuit failure, reduce the risk of life safety failure during user driving, and reduce the replacement cost of the vehicle electric control.

[0008] The second object of the present disclosure is to provide a vehicle.

[0009] To achieve the above object, the first aspect of the present disclosure provides a power protection circuit of a motor controller, comprising: a voltage conversion module connected with a high-voltage battery, configured to convert high-voltage electricity into low-voltage electricity in response to a conversion instruction; a power processing module connected with the voltage conversion module and a low-voltage battery respectively, used for filtering the low-voltage electricity; a voltage stabilizing module connected with the power processing module, used for stabilizing the low-voltage electricity after filtering, and outputting stable voltage; a protection module connected with the voltage stabilizing module, used for monitoring the stable voltage for abnormality, and outputting the stable voltage to a drive bridge for power supply when the monitoring result is normal; and a controller connected with the voltage conversion module, the voltage stabilizing module and the protection module respectively, configured to respond to an abnormal signal of the voltage stabilizing module and an abnormal signal of the protection module.

[0010] According to the power protection circuit of the motor controller, the voltage conversion module converts high-voltage electricity into low-voltage electricity in response to a conversion instruction; the power processing module filters the low-voltage electricity; the voltage stabilizing module stabilizes the low-voltage electricity after filtering, and outputs stable voltage; the protection module monitors the stable voltage for abnormality, and outputs the stable voltage to a drive bridge for power supply when the monitoring result is normal; and the controller responds to an abnormal signal of the voltage stabilizing module and an abnormal signal of the protection module, and protects the voltage stabilizing module and the protection module. Thus, the voltage stabilizing module and the protection module in the circuit both have self-checking ability of voltage abnormality and current abnormality, can realize self-protection when the low-voltage power protection module is abnormal, improve the timeliness of protection, avoid single module failure causing the failure of the whole circuit, reduce the risk of life safety failure of the user during driving; at the same time, for recoverable failure, through self-checking of each module, the circuit can be protected in time, and can continue to work normally after recovery, reducing the replacement cost of the whole vehicle electric control.

[0011] In addition, the power protection circuit of the motor controller according to the above embodiments of the present disclosure can also have the following additional technical features:

[0012] Specifically, the voltage stabilizing module comprises: a first voltage dividing unit, an input end of the first voltage dividing unit being connected with an output end of the power supply processing module; a voltage stabilizing chip, a first pin of the voltage stabilizing chip being connected with the output end of the power supply processing module, a second pin of the voltage stabilizing chip being connected with an output end of the first voltage dividing unit, a third pin of the voltage stabilizing chip being connected with the output end of the power supply processing module through a first capacitor, the second pin of the voltage stabilizing chip being further adapted to be connected with an enable pin of the controller, a fourth pin of the voltage stabilizing chip being further adapted to be connected with an input pin of the controller; a voltage converting unit, input ends of the voltage converting unit being connected with a seventh pin of the voltage stabilizing chip and the output end of the power supply processing module respectively, a first output end of the voltage converting unit being connected with an eighth pin of the voltage stabilizing chip; a second voltage dividing unit, an input end of the second voltage dividing unit being connected with a second output end of the voltage converting unit, an output end of the second voltage dividing unit being connected with a ninth pin of the voltage stabilizing chip.

[0013] Specifically, the first voltage dividing unit comprises: a first resistor, one end of the first resistor being connected with the output end of the power supply processing module; a second resistor, one end of the second resistor being connected with the other end of the first resistor and having a first node, the other end of the second resistor being grounded, the first node being connected with the second pin of the voltage stabilizing chip.

[0014] Specifically, the voltage converting unit comprises: a switch tube, a control end of the switch tube being connected with the seventh pin of the voltage stabilizing chip, a first inductor, one end of the first inductor being connected with the output end of the power supply processing module, the other end of the first inductor being connected with a first end of the switch tube, a second capacitor, one end of the second capacitor being connected with the first end of the switch tube; a second inductor, one end of the second inductor being connected with the other end of the second capacitor, the other end of the second inductor being grounded; a diode, a positive electrode of the diode being connected with the other end of the second capacitor, a negative electrode of the diode being connected with the input end of the protection module and the other end of the second inductor through a third capacitor respectively; a third resistor, one end of the third resistor being connected with a second end of the switch tube and the eighth pin of the voltage stabilizing chip respectively, the other end of the third resistor being grounded.

[0015] Specifically, the voltage stabilizing module further comprises: a switching frequency adjusting unit, the switching frequency adjusting unit being connected with a fifth pin of the voltage stabilizing chip and being configured to adjust a switching frequency output by the seventh pin of the voltage stabilizing chip; a soft start unit, the soft start unit being connected with a sixth pin of the voltage stabilizing chip and being configured to adjust a soft start time output by the seventh pin of the voltage stabilizing chip.

[0016] Specifically, the soft start unit comprises a fourth capacitor, one end of the fourth capacitor being connected with the sixth pin of the voltage stabilizing chip, and the other end of the fourth capacitor being grounded; and the switching frequency adjusting unit comprises a fifth capacitor and a sixth resistor connected in series, the other end of the sixth resistor being connected with the fifth pin of the voltage stabilizing chip, and the other end of the fifth capacitor being grounded.

[0017] Specifically, the protection module comprises a third voltage dividing unit, an input end of the third voltage dividing unit being connected with an output end of the voltage stabilizing module; a protection chip, a second pin and a third pin of the protection chip being connected with output ends of the third voltage dividing unit, a first pin of the protection chip being connected with the output end of the voltage stabilizing module, a fifth pin of the protection chip being connected with the output end of the voltage stabilizing module through a sixth capacitor, the second pin of the protection chip being further adapted to be connected with an enable end of the controller, an eleventh pin, a twelfth pin and a sixth pin of the protection chip being adapted to be connected with input pins of the controller; and a fourth voltage dividing unit, an input end of the fourth voltage dividing unit being connected with a seventh pin of the protection chip, and an output end of the fourth voltage dividing unit being connected with the drive bridge.

[0018] Specifically, the protection module further comprises a voltage start-up slope adjusting unit connected with a fourth pin of the protection chip and configured to adjust a voltage start-up slope of an output voltage of the seventh pin of the protection chip, and a threshold adjusting unit connected with an eighth pin of the protection chip and configured to adjust an overcurrent threshold and a short-circuit protection threshold of the protection chip.

[0019] Specifically, the voltage start-up slope adjusting unit comprises a seventh capacitor, one end of the seventh capacitor being connected with the fourth pin of the protection chip, and the other end of the seventh capacitor being connected with the fifth pin of the protection chip; and the threshold adjusting unit comprises a twelfth resistor, one end of the twelfth resistor being connected with the eighth pin of the protection chip, and the other end of the twelfth resistor being grounded.

[0020] To achieve the above object, a second aspect of the present disclosure provides a vehicle comprising the power supply protection circuit of the motor controller.

[0021] The vehicle according to the embodiments of the present disclosure can improve the timeliness of protection, avoid single module failure, cause failure of the whole circuit, and reduce the risk of life safety failure of the user during driving; at the same time, for recoverable failure, through self-checking of each module, timely protection can be realized, and after recovery, normal work can be continued, thereby reducing the replacement cost of the vehicle electric control.

[0022] Additional aspects and advantages of the present disclosure will be made apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0023] Fig. 1 is a block schematic diagram of a power protection circuit of a motor controller according to an embodiment of the present disclosure;

[0024] Fig. 2 is a hardware topology diagram of a voltage stabilization module according to an embodiment of the present disclosure;

[0025] Fig. 3 is a hardware topology diagram of a protection module according to an embodiment of the present disclosure;

[0026] Fig. 4 is a block schematic diagram of a vehicle according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0027] Embodiments of the present disclosure are described in detail below with reference to the accompanying drawings, in which like or similar elements are denoted by the same or similar reference signs, and examples of the embodiments are described in detail below. The embodiments described below by reference to the accompanying drawings are exemplary and are intended to explain the present disclosure, and are not to be understood as limiting the present disclosure.

[0028] A power protection circuit of a motor controller and a vehicle according to embodiments of the present disclosure are described below with reference to the accompanying drawings.

[0029] Fig. 1 is a block schematic diagram of a power protection circuit of a motor controller according to an embodiment of the present disclosure.

[0030] As shown in Fig. 1, the power protection circuit 100 of the motor controller according to an embodiment of the present disclosure includes a voltage conversion module 110, a power processing module 120, a voltage stabilization module 130, a protection module 140, and a controller 150.

[0031] The voltage conversion module 110 is connected to a high-voltage battery and is configured to convert high-voltage electricity to low-voltage electricity in response to a conversion instruction. The power processing module 120 is connected to the voltage conversion module 110 and a low-voltage battery, respectively, and is configured to filter the low-voltage electricity. The voltage stabilization module 130 is connected to the power processing module 120 and is configured to stabilize the filtered low-voltage electricity and output a stable voltage. The protection module 140 is connected to the voltage stabilization module 130 and is configured to monitor the stable voltage for abnormalities and output the stable voltage to a drive axle for power supply when the monitoring result is normal. The controller 150 is connected to the voltage conversion module 110, the voltage stabilization module 130, and the protection module 140, respectively, and is configured to respond to an abnormal signal of the voltage stabilization module 130 and an abnormal signal of the protection module 140.

[0032] Specifically, when the low-voltage battery normally supplies power, the low-voltage battery outputs low-voltage electricity to the power processing module 120; when the low-voltage battery cannot normally supply power, the controller 150 sends a conversion instruction to the voltage conversion module 110, and when the voltage conversion module 110 receives the conversion instruction, the voltage conversion module 110 converts the direct-current high-voltage electricity provided by the high-voltage battery into direct-current low-voltage electricity and delivers the direct-current low-voltage electricity to the power processing module 120. The power processing module 120 filters the low-voltage electricity and filters the noise in the direct-current low-voltage electricity, and outputs the filtered low-voltage electricity to the voltage stabilizing module 130. The voltage stabilizing module 130 stabilizes the low-voltage electricity with large fluctuations, converts it into stable voltage and outputs it to the protection module 140. The voltage stabilizing module 130 can also achieve self-protection and can feed back the abnormal signal during failure to the controller 150. The protection module 140 monitors the stable voltage for abnormalities, and when the stable voltage is normal, the monitoring result is normal, and the protection module 140 outputs the stable voltage to the drive bridge for power supply; when the stable voltage is abnormal, the monitoring result is abnormal, and the protection module 140 feeds back the abnormal signal to the controller 150. The controller 150 can shut down the voltage stabilizing module 130 according to the abnormal signal of the voltage stabilizing module 130, and can shut down the protection module 140 according to the abnormal signal of the protection module 140.

[0033] According to one embodiment of the present disclosure, as shown in FIG. 2, the voltage stabilizing module 130 includes a first voltage dividing unit 131, a voltage stabilizing chip U1, a voltage conversion unit 132, and a second voltage dividing unit 133. The input end of the first voltage dividing unit 131 is connected to the output end of the power processing module 120; the first pin of the voltage stabilizing chip U1 is connected to the output end of the power processing module 120, the second pin of the voltage stabilizing chip U1 is connected to the output end of the first voltage dividing unit 131, the third pin of the voltage stabilizing chip U1 is connected to the output end of the power processing module 120 through the first capacitor C1, the second pin of the voltage stabilizing chip U1 is also adapted to be connected to the enable pin of the controller 150, and the fourth pin of the voltage stabilizing chip U1 is also adapted to be connected to the input pin of the controller 150; the input end of the voltage conversion unit 132 is connected to the seventh pin of the voltage stabilizing chip U1 and the output end of the power processing module 120 respectively, and the first output end of the voltage conversion unit 132 is connected to the eighth pin of the voltage stabilizing chip U1; the input end of the second voltage dividing unit 133 is connected to the second output end of the voltage conversion unit 132, and the output end of the second voltage dividing unit 133 is connected to the ninth pin of the voltage stabilizing chip U1.

[0034] Specifically, the second pin of the voltage stabilizing chip U1 can receive the En_LV enable signal output by the controller 150. The controller 150 enables or shuts down the voltage stabilizing chip U1 by outputting En_LV according to the received fault signal Fault_V of the voltage stabilizing chip U1 and the current whole machine working state, controls the power output, and can avoid damage to the components in the circuit under abnormal conditions.

[0035] According to one embodiment of the present disclosure, as shown in FIG. 2, the first voltage dividing unit 131 includes: a first resistor R1, one end of the first resistor R1 being connected with the output end of the power processing module 120; a second resistor R2, one end of the second resistor R2 being connected with the other end of the first resistor R1 and having a first node, the other end of the second resistor R2 being grounded, and the first node being connected with the second pin of the voltage stabilizing chip U1.

[0036] According to one embodiment of the present disclosure, as shown in FIG. 2, the voltage converting unit 132 includes: a switch tube Q1, the control end of the switch tube Q1 being connected with the seventh pin of the voltage stabilizing chip U1; a first inductor L1, one end of the first inductor L1 being connected with the output end of the power processing module 120, and the other end of the first inductor L1 being connected with the first end of the switch tube Q1; a second capacitor C2, one end of the second capacitor C2 being connected with the first end of the switch tube Q1; a second inductor L2, one end of the second inductor L2 being connected with the other end of the second capacitor C2, and the other end of the second inductor L2 being grounded; a diode D1, the positive electrode of the diode D1 being connected with the other end of the second capacitor C2, and the negative electrode of the diode D1 being connected with the input end of the protection module 140 and the other end of the second inductor L2 through a third capacitor C3 respectively; and a third resistor R3, one end of the third resistor R3 being connected with the second end of the switch tube Q1 and the eighth pin of the voltage stabilizing chip U1 respectively, and the other end of the third resistor R3 being grounded.

[0037] Specifically, as shown in FIG. 2, the power processing module 120 outputs a direct current low voltage V_LBAT to the voltage stabilizing chip U1, the first capacitor C1 is used to stabilize the power supply of the voltage stabilizing chip U1, the seventh pin of the voltage stabilizing chip U1 outputs a PWM signal to control the opening and closing of the switch tube Q1, the switch tube Q1 is combined with the first inductor L1, the second inductor L2, the second capacitor C2, the diode D1 and the third capacitor C3 to realize a SEPIC voltage stabilizing circuit, and a stable voltage V_LV is output, and the specific working process is as follows: the switch tube Q1 is periodically switched under the control of the PWM signal. When the switch tube Q1 is turned on, the direct current low voltage V_LBAT stores energy in the first inductor L1, the second capacitor C2 releases energy to store energy in the second inductor L2, and the third capacitor C3 releases energy to form the output voltage V_LV; when the switch tube Q1 is turned off, the direct current low voltage V_LBAT releases energy through the first inductor L1 to supply power to the load, while charging the second capacitor C2 and the third capacitor C3, the second inductor L2 releases energy and supplies power to the load through the diode D1, while charging the third capacitor C3, V_LBAT, the first inductor L1 and the second inductor L2 jointly supply power to form a stable output voltage V_LV, and by adjusting the duty cycle of the PWM signal, the proportion of energy stored and released in the inductor can be controlled, and then the size of the output voltage V_LV can be adjusted. When the switch tube Q1 is turned on, the current of the switch tube Q1 flows through the third resistor R3, the eighth pin of the voltage stabilizing chip U1 collects the voltage on the third resistor R3, and the voltage stabilizing chip U1 can determine whether overcurrent occurs according to the input value of the eighth pin. If overcurrent occurs, the voltage stabilizing chip U1 internally executes a protection mechanism, the seventh pin of the voltage stabilizing chip U1 outputs a protection signal, such as a hiccup protection, to limit the output current value and avoid burning out the device due to overcurrent in the circuit.

[0038] The direct current low voltage V_LBAT is divided by the first resistor R1 and the second resistor R2, and a signal is fed back to the second pin of the voltage stabilizing chip U1 for under-voltage judgment. If the input voltage V_LBAT of the voltage stabilizing chip U1 is abnormal, the voltage stabilizing chip U1 internally executes a protection mechanism, the seventh pin of the voltage stabilizing chip U1 stops outputting the PWM signal, and the voltage stabilizing chip U1 continues to work to produce unpredictable faults when the input voltage is abnormal.

[0039] According to one embodiment of the present disclosure, as shown in FIG. 2, the second voltage dividing unit 133 comprises: a fourth resistor R4, one end of the fourth resistor R4 being connected with the output end of the voltage converting unit 132; a fifth resistor R5, one end of the fifth resistor R5 being connected with the other end of the fourth resistor R4 and having a second node, the other end of the fifth resistor R5 being grounded, and the second node being connected with the ninth pin of the voltage stabilizing chip U1.

[0040] Specifically, the stable voltage V_LV output by the voltage stabilizing module 130 is divided by the fourth resistor R4 and the fifth resistor R5, and then fed back to the ninth pin of the voltage stabilizing chip U1. The voltage stabilizing chip U1 adjusts the duty cycle of the PWM signal output by the seventh pin according to the input value of the ninth pin, so that the voltage V_LV can be stably output according to the preset voltage value.

[0041] According to one embodiment of the present disclosure, as shown in FIG. 2, the voltage stabilizing module 130 further comprises: a switching frequency adjusting unit 134 connected to the fifth pin of the voltage stabilizing chip U1 and configured to adjust the switching frequency of the PWM signal output by the seventh pin of the voltage stabilizing chip U1; and a soft start unit 135 connected to the sixth pin of the voltage stabilizing chip U1 and configured to adjust the soft start time of the PWM signal output by the seventh pin of the voltage stabilizing chip U1.

[0042] Further, according to one embodiment of the present disclosure, as shown in FIG. 2, the soft start unit 135 comprises: a fourth capacitor C4, one end of which is connected to the sixth pin of the voltage stabilizing chip U1 and the other end of which is grounded; and the switching frequency adjusting unit 134 comprises: a sixth resistor R6 and a fifth capacitor C5 connected in series, one end of the sixth resistor R6 being connected to the fifth pin of the voltage stabilizing chip U1 and the other end of the fifth capacitor C5 being grounded.

[0043] Specifically, by setting the capacitance value of the fourth capacitor C4 connected to the sixth pin of the voltage stabilizing chip U1, the soft start time of the PWM signal output by the seventh pin of the voltage stabilizing chip U1 can be set, so that the voltage fluctuation during startup can be reduced and the stability of the power supply circuit can be improved. By setting the sixth resistor R6 and the fifth capacitor C5 connected to the fifth pin of the voltage stabilizing chip U1, the switching frequency of the PWM signal output by the seventh pin of the voltage stabilizing chip U1 can be set, so that different application environments can be adapted and the EMC performance of the power supply circuit can be optimized.

[0044] According to one embodiment of the present disclosure, as shown in FIG. 3, the protection module 140 comprises: a third voltage dividing unit 141, an input end of which is connected to an output end of the voltage stabilizing module 130; a protection chip U2, a second pin and a third pin of which are connected to an output end of the third voltage dividing unit 141, a first pin of which is connected to the output end of the voltage stabilizing module 130, a fifth pin of which is connected to the output end of the voltage stabilizing module 130 through a sixth capacitor C6, the second pin of which is further adapted to be connected to an enable end of a controller 150, and eleventh, twelfth and sixth pins of which are adapted to be connected to input pins of the controller 150; and a fourth voltage dividing unit 142, an input end of which is connected to a seventh pin of the protection chip U2 and an output end of which is connected to a drive bridge.

[0045] According to one embodiment of the present disclosure, as shown in FIG. 3, the third voltage dividing unit 141 comprises: a seventh resistor R7, one end of the seventh resistor R7 being connected with the output end of the voltage stabilizing module 130; an eighth resistor R8, one end of the eighth resistor R8 being connected with the other end of the seventh resistor R7 and having a third node, the third node being connected with the second pin of the protection chip U2; and a ninth resistor R9, one end of the ninth resistor R9 being connected with the other end of the eighth resistor R8 and having a fourth node, the fourth node being connected with the third pin of the protection chip U2, and the other end of the ninth resistor R9 being grounded.

[0046] Specifically, the voltage V_LV output by the voltage stabilizing module 130 is input to the protection module 140, the sixth capacitor C6 stabilizes the input voltage V_LV of the protection chip U2, the voltage V_LV is input to the first pin of the protection chip U2, and the eighth capacitor C8 connected with the ninth pin of the protection chip U2 stabilizes the output voltage V_LV_P of the protection chip U2. The voltage V_LV is divided by the seventh resistor R7, the eighth resistor R8 and the ninth resistor R9, when the input voltage signal received by the second pin and the third pin of the protection chip U2 exceeds the threshold value, the protection chip U2 executes the protection mechanism, disconnects the voltage input of the first pin and the voltage output of the seventh pin of the protection chip U2, does not output the voltage V_LV_P, and at the same time, the sixth pin outputs the fault signal Fault_LP to the controller 150. When the voltage of the first pin of the protection chip U2 and the voltage of the seventh pin are opposite, the voltage input of the first pin and the voltage output of the seventh pin of the protection chip U2 are disconnected, the voltage V_LV_P is not output, and at the same time, the sixth pin outputs the fault signal Fault_LP to the controller 150. The protection chip U2 can monitor the current value output by the protection module 140 and output the monitoring signal to the controller 150 through the twelfth pin. The second pin of the protection chip U2 receives the En_LP enable signal output by the controller 150, the controller 150 receives the fault signals Fault_LP, Fault_LO and the current monitoring signal IM_LO sent by the eleventh pin, the twelfth pin and the sixth pin of the protection chip U2, and combines the current working state of the whole machine to output the enable signal En_LP to the second pin of the protection chip U2 to enable or close the protection chip U2, control the output of the rear-stage power supply, and avoid damage to the components in the circuit under abnormal conditions.

[0047] According to one embodiment of the present disclosure, as shown in FIG. 3, the fourth voltage dividing unit 142 comprises: a tenth resistor R10, one end of the tenth resistor R10 being connected with the seventh pin of the protection chip U2; and an eleventh resistor R11, one end of the eleventh resistor R11 being connected with the other end of the tenth resistor R10 and having a fifth node, the fifth node being connected with the tenth pin of the protection chip U2, and the other end of the eleventh resistor R11 being grounded.

[0048] Specifically, the voltage V_LV_P is divided by the tenth resistor R10 and the eleventh resistor R11, and when the signal received by the tenth pin of the protection chip U2 exceeds the output signal threshold value, the eleventh pin outputs a fault signal Fault_LO to the controller 150.

[0049] According to one embodiment of the present disclosure, as shown in FIG. 3, the protection module 140 further comprises: a voltage start-up slope adjustment unit 143 connected to the fourth pin of the protection chip U2 and configured to adjust the voltage start-up slope of the output voltage of the seventh pin of the protection chip U2; and a threshold adjustment unit 144 connected to the eighth pin of the protection chip U2 and configured to adjust the overcurrent threshold value and the short-circuit protection threshold value of the protection chip U2.

[0050] Further, according to one embodiment of the present disclosure, as shown in FIG. 3, wherein the voltage start-up slope adjustment unit 143 comprises: a seventh capacitor C7, one end of the seventh capacitor C7 being connected to the fourth pin of the protection chip U2, and the other end of the seventh capacitor C7 being connected to the fifth pin of the protection chip U2; and the threshold adjustment unit 144 comprises: a twelfth resistor R12, one end of the twelfth resistor R12 being connected to the eighth pin of the protection chip U2, and the other end of the twelfth resistor R12 being grounded.

[0051] Specifically, by adjusting the seventh capacitor C7 connected to the fourth pin of the protection chip U2, the voltage start-up slope of the output voltage V_LV_P of the seventh pin of the protection chip U2 can be adjusted, the fluctuation of the voltage at the start-up time is reduced, and the stability of the power supply circuit is improved. By adjusting the twelfth resistor R12 connected to the eighth pin of the protection chip U2, the overcurrent and short-circuit protection values of the protection chip U2 can be adjusted. When the output current of the seventh pin of the protection chip U2 exceeds the preset overcurrent value, the protection mechanism of the protection chip U2 is executed to limit the output current value, and when the output current value exceeds the preset short-circuit value, the voltage input of the first pin and the voltage output of the seventh pin of the protection chip U2 are disconnected, and the voltage V_LV_P is not output. At the same time, the eleventh pin outputs a fault signal Fault_LO to the controller 150.

[0052] According to one embodiment of the present disclosure, the voltage conversion module 110 comprises a DCDC converter. The direct-current high voltage provided by the high-voltage battery is converted into direct-current low voltage by the voltage conversion module 110.

[0053] In summary, according to the power protection of the motor controller of the embodiment of the present disclosure, the circuit voltage conversion module converts high-voltage electricity into low-voltage electricity in response to a conversion instruction; the power processing module filters the low-voltage electricity; the voltage stabilization module stabilizes the low-voltage electricity after the filtering and outputs stable voltage; the protection module monitors the stable voltage for abnormalities and outputs the stable voltage to the drive bridge for power supply when the monitoring result is normal; and the controller protects the voltage stabilization module and the protection module in response to the abnormal signals of the voltage stabilization module and the protection module. Thus, the voltage stabilization module and the protection module in the circuit both have self-checking capabilities for voltage abnormalities and current abnormalities, can realize self-protection when the low-voltage power protection module is abnormal, improve the timeliness of protection, avoid single module failure, cause full-circuit failure, and reduce the risk of life safety failure of the user during driving; at the same time, for recoverable failures, the modules can be protected in time through self-checking, and can continue to work normally after recovery, reducing the replacement cost of the vehicle electric control.

[0054] Corresponding to the above embodiment, the present disclosure also proposes a vehicle.

[0055] FIG. 4 is a block schematic diagram of a vehicle according to an embodiment of the present disclosure.

[0056] As shown in FIG. 4, the vehicle 200 of the embodiment of the present disclosure includes the power protection circuit 100 of the motor controller described above.

[0057] According to the vehicle of the embodiment of the present disclosure, the power protection circuit of the motor controller described above can improve the timeliness of protection, avoid single module failure, cause full-circuit failure, and reduce the risk of life safety failure of the user during driving; at the same time, for recoverable failures, the modules can be protected in time through self-checking, and can continue to work normally after recovery, reducing the replacement cost of the vehicle electric control.

[0058] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present disclosure. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0059] In addition, the terms "first", "second", etc. are used only for the purpose of description, and should not be understood as indicating or implying relative importance or implying a number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present disclosure, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise explicitly specified and limited.

[0060] In the present disclosure, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, can be fixedly connected, or can be detachably connected, or integrated; can be mechanically connected, or can be electrically connected; can be directly connected, or indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present disclosure can be understood according to the specific circumstances.

[0061] Although the embodiments of the present disclosure have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present disclosure, and those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present disclosure.

Claims

1. A power protection circuit of a motor controller, comprising: a voltage conversion module connected with a high-voltage battery and configured to convert high-voltage power into low-voltage power in response to a conversion instruction; a power processing module connected with the voltage conversion module and a low-voltage battery respectively, and configured to filter the low-voltage power; a voltage stabilizing module connected with the power processing module, and configured to stabilize the filtered low-voltage power and output a stable voltage; a protection module connected with the voltage stabilizing module, and configured to monitor the stable voltage for abnormality, and output the stable voltage to a drive bridge for power supply when the monitoring result is normal; a controller connected with the voltage conversion module, the voltage stabilizing module and the protection module respectively, and configured to respond to an abnormal signal of the voltage stabilizing module and an abnormal signal of the protection module.

2. The power supply protection circuit for a motor controller according to claim 1, wherein The voltage stabilizing module comprises: a first voltage dividing unit, an input end of which is connected with an output end of the power processing module; a voltage stabilizing chip, a first pin of which is connected with the output end of the power processing module, a second pin of which is connected with an output end of the first voltage dividing unit, a third pin of which is connected with the output end of the power processing module through a first capacitor, the second pin of which is further adapted to be connected with an enable pin of the controller, and a fourth pin of which is further adapted to be connected with an input pin of the controller; a voltage conversion unit, input ends of which are connected with a seventh pin of the voltage stabilizing chip and the output end of the power processing module respectively, and a first output end of which is connected with an eighth pin of the voltage stabilizing chip; a second voltage dividing unit, an input end of which is connected with a second output end of the voltage conversion unit, and an output end of which is connected with a ninth pin of the voltage stabilizing chip.

3. The power supply protection circuit for a motor controller according to claim 2, wherein The first voltage dividing unit comprises: a first resistor, one end of which is connected with the output end of the power processing module; a second resistor, one end of which is connected with the other end of the first resistor and has a first node, and the other end of which is grounded, and the first node is connected with the second pin of the voltage stabilizing chip.

4. A power supply protection circuit for a motor controller according to claim 2 or 3, wherein, The voltage conversion unit comprises: a switch tube, a control end of which is connected with the seventh pin of the voltage stabilizing chip, a first inductor, one end of which is connected with the output end of the power processing module, and the other end of which is connected with a first end of the switch tube, a second capacitor, one end of which is connected with the first end of the switch tube; a second inductor, one end of which is connected with the other end of the second capacitor, and the other end of which is grounded; a diode, an anode of which is connected with the other end of the second capacitor, and a cathode of which is connected with an input end of the protection module and the other end of the second inductor through a third capacitor respectively. A third resistor, one end of the third resistor is connected with the second end of the switch tube and the eighth pin of the voltage stabilizing chip respectively, and the other end of the third resistor is grounded.

5. A power supply protection circuit for a motor controller according to any one of claims 2 to 4 wherein, The voltage stabilizing module further comprises: A switch frequency adjusting unit, the switch frequency adjusting unit is connected with the fifth pin of the voltage stabilizing chip, and is configured to adjust the switch frequency output by the seventh pin of the voltage stabilizing chip; A soft start unit, the soft start unit is connected with the sixth pin of the voltage stabilizing chip, and is configured to adjust the soft start time output by the seventh pin of the voltage stabilizing chip.

6. The power supply protection circuit of the motor controller according to claim 5, wherein, The soft start unit comprises: a fourth capacitor, one end of the fourth capacitor is connected with the sixth pin of the voltage stabilizing chip, and the other end of the fourth capacitor is grounded; The switch frequency adjusting unit comprises: a sixth resistor and a fifth capacitor connected in series, the other end of the sixth resistor is connected with the fifth pin of the voltage stabilizing chip, and the other end of the fifth capacitor is grounded.

7. The power supply protection circuit for a motor controller according to any one of claims 1 to 6, wherein The protection module comprises: A third voltage dividing unit, an input end of the third voltage dividing unit is connected with an output end of the voltage stabilizing module; A protection chip, a second pin and a third pin of the protection chip are connected with output ends of the third voltage dividing unit, a first pin of the protection chip is connected with the output end of the voltage stabilizing module, a fifth pin of the protection chip is connected with the output end of the voltage stabilizing module through a sixth capacitor, the second pin of the protection chip is also adapted to be connected with an enable end of the controller, an eleventh pin, a twelfth pin and a sixth pin of the protection chip are adapted to be connected with input pins of the controller; A fourth voltage dividing unit, an input end of the fourth voltage dividing unit is connected with a seventh pin of the protection chip, and output ends of the fourth voltage dividing unit are connected with the drive bridge.

8. The power supply protection circuit for a motor controller according to claim 7, wherein, The protection module further comprises: A voltage start slope adjusting unit, the voltage start slope adjusting unit is connected with a fourth pin of the protection chip, and is configured to adjust the voltage start slope of the output voltage of the seventh pin of the protection chip; A threshold adjusting unit, the threshold adjusting unit is connected with an eighth pin of the protection chip, and is configured to adjust the overcurrent threshold and the short circuit protection threshold of the protection chip.

9. The power supply protection circuit of the motor controller according to claim 8, wherein, The voltage start slope adjusting unit comprises: a seventh capacitor, one end of the seventh capacitor is connected with the fourth pin of the protection chip, and the other end of the seventh capacitor is connected with the fifth pin of the protection chip; The threshold adjusting unit comprises: a twelfth resistor, one end of the twelfth resistor is connected with the eighth pin of the protection chip, and the other end of the twelfth resistor is grounded.

10. A vehicle comprising the power supply protection circuit of the motor controller according to any one of claims 1-9.

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