Power supply redundancy switch control circuit

Abstract

The utility model discloses a power supply redundancy switch control circuit. The power supply feedback loop part monitors whether power supply of the motor power supply line MR and the electromagnetic valve power supply line VR fails or not in real time and sends the power supply failure to the MCU, and when one of the two power supply lines fails, the MCU directly sends a level control signal to the motor power supply MR part and the electromagnetic valve power supply VR part. And meanwhile, a voltage signal is sent to a driving chip so as to generate a driving signal CP to a motor power supply MR part and an electromagnetic valve power supply VR part respectively, so that the motor power supply MR part and the electromagnetic valve power supply VR part are controlled to conduct a motor power supply line MR and an electromagnetic valve power supply line VR to a load detection port SUP respectively. When one power supply line is accidentally disconnected, the controller can control the MOS tube switch of the other power supply line to be switched on, redundant power supply is provided, normal functions of the passenger car are guaranteed, and the use safety of the passenger car is improved.

Description

Technical Field

[0001] The utility model relates to a circuit and a control method in the technical field of motor drive, in particular to a switch control circuit with redundant power supply. Background Art

[0002] The vehicle body stability system contains two power supply lines, one for the solenoid valve coil power supply VR, and one for the motor power supply line MR for the drive motor. The two power supply lines are independent of each other in the controller and are connected to the battery of the vehicle through their own wires outside the controller. With the improvement of the national standard for the functional safety of the controller, this solution has obvious defects in certain working conditions. For example, when the vehicle is parked on a slope for a short time, the motor will operate to maintain the pressure of the vehicle's wheel cylinder. At this time, if the MR motor power supply line is abnormal, such as an open circuit, it will cause insufficient oil pressure replenishment in the wheel cylinder, and the vehicle will slide down the slope, affecting driving safety. Utility Model Content

[0003] In order to solve the problems existing in the background technology, the utility model discloses a switch control circuit with redundant power supply.

[0004] The technical solution of the utility model is achieved in this way:

[0005] The utility model comprises a motor power supply MR part, a solenoid valve power supply VR part and a power supply feedback loop part which are connected to each other.

[0006] The motor power supply MR part is connected to the motor power supply line MR and the motor respectively, and is used to receive signals from the micro control unit MCU and the driver chip to control the conduction of the circuit from the motor power supply line MR to the motor power supply;

[0007] The solenoid valve power supply VR part is connected to the solenoid valve power supply line VR and the solenoid valve respectively, and is used to receive signals from the microcontroller unit MCU and the driver chip to control the conduction of the circuit from the solenoid valve power supply line VR to the solenoid valve power supply;

[0008] The power supply feedback loop part is connected between the motor power supply MR part and the solenoid valve power supply VR part and the load detection port SUP, and is used to detect whether the power supply of the motor power supply line MR and the solenoid valve power supply line VR is faulty;

[0009] A driver chip is used to receive a bootstrap signal from a microcontroller unit MCU and then generate a drive signal CP to send to a motor power supply MR part and a solenoid valve power supply VR part;

[0010] The microcontroller unit MCU is respectively connected to the motor power supply MR part, the solenoid valve power supply VR part and the power supply feedback loop part, and is used to obtain the detection result of whether the power supply of the motor power supply line MR / solenoid valve power supply line VR is faulty from the power supply feedback loop part, and then combine the drive chip feedback to control the work of the motor power supply MR part and the solenoid valve power supply VR part.

[0011] The motor power supply MR part includes MOS tube Q2, diode D2, diode D4, transistor Q4, and transistor Q6; the motor power supply line MR is connected to the drain of MOS tube Q2, the source of MOS tube Q2 is connected to the load detection port SUP and connected to the solenoid valve power supply VR part; the diode D2 and the diode D4 are reversely connected in series and connected in parallel with the resistor R5, and the two ends of the resistor R5 are connected between the gate and the source of the MOS tube Q2; the gate of the MOS tube Q2 is connected to the collector of the transistor Q4 through the resistor R9, and the capacitor C3 It is connected between the collector and emitter of the transistor Q4, the emitter of the transistor Q4 is connected to the drive signal CP, and the emitter is connected to the solenoid valve power supply VR part. The resistor R10 is connected between the base and emitter of the transistor Q4; the base of the transistor Q4 is connected to the collector of the transistor Q6 through the resistors R12 and R14 in sequence, the emitter of the transistor Q6 is grounded, the base of the transistor Q6 and the motor drive signal port ACT_A of the micro control unit MCU, and the base of the transistor Q6 is grounded through the resistor R16 and the capacitor C5 respectively.

[0012] The motor power supply MR part includes a MOS tube Q1, a diode D1, a diode D3, a transistor Q3, and a transistor Q4; the solenoid valve power supply line VR is connected to the drain of the MOS tube Q1, and the source of the MOS tube Q1 is connected to the load detection port SUP and connected to the motor power supply MR part; the diode D1 and the diode D3 are reversely connected in series and connected in parallel with the resistor R4, and the two ends of the resistor R4 are connected between the gate and the source of the MOS tube Q1; the gate of the MOS tube Q1 is connected to the collector of the transistor Q3 through the resistor R8, and the capacitor C 2 is connected between the collector and emitter of the transistor Q3, the emitter of the transistor Q3 is connected to the emitter of the transistor Q4 of the solenoid valve power supply VR part, and the resistor R7 is connected between the base and emitter of the transistor Q3; the base of the transistor Q3 is connected to the collector of the transistor Q5 through the resistor R11 and the resistor R13 in sequence, the emitter of the transistor Q5 is grounded, the base of the transistor Q5 and the solenoid valve drive signal port ACT_B of the micro control unit MCU, and the base of the transistor Q5 is grounded through the resistor R15 and the capacitor C4 respectively.

[0013] The power supply feedback loop part includes capacitor C1, resistor R2 and resistor R3. The detection port ADC_SUP of the micro control unit MCU is grounded via capacitor C1 and resistor R3 respectively. The detection port ADC_SUP of the micro control unit MCU is connected to the source of the MOS tube Q1 in the motor power supply MR part and the source of the MOS tube Q2 in the solenoid valve power supply VR part respectively after passing through resistor R2.

[0014] The MOS tube Q1 is an NMOS tube, the MOS tube Q2 is an NMOS tube, the transistor Q3 is a PNP tube, the transistor Q4 is a PNP tube, the transistor Q5 is an NPN tube, and the transistor Q6 is an NPN tube.

[0015] The diodes D1 to D4 are all voltage-stabilizing diodes.

[0016] Beneficial effects of the utility model:

[0017] The utility model can control the MOS tube switch of another power supply line to open when one power supply line is accidentally disconnected, so as to provide redundant power supply, ensure the normal functions of the passenger car, and improve the safety of the passenger car. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The schematic diagram of a switch control circuit for power supply redundancy is shown in FIG. DETAILED DESCRIPTION

[0019] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0020] like Figure 1 As shown, the circuit specifically implemented comprises two parts of a motor power supply MR part 1 and a solenoid valve power supply VR part 2 connected to each other, and a power supply feedback loop part 3 connected to the motor power supply MR part 1 and the solenoid valve power supply VR part 2;

[0021] The motor power supply MR part 1 is connected to the motor power supply line MR and the motor respectively, and is used to connect the motor power supply line MR to power the motor, and is used to receive signals from the micro control unit MCU and the driver chip to control the conduction of the circuit from the motor power supply line MR to the motor power supply;

[0022] The solenoid valve power supply VR part 2 is connected to the solenoid valve power supply line VR and the solenoid valve respectively, and is used to connect the solenoid valve power supply line VR to power the solenoid valve, and is used to receive signals from the microcontroller unit MCU and the driver chip to control the conduction of the circuit from the solenoid valve power supply line VR to the solenoid valve power supply;

[0023] The power supply feedback loop part 3 is connected between the motor power supply MR part 1 and the solenoid valve power supply VR part 2 and the load detection port SUP, and is used to detect whether the power supply of the motor power supply line MR and the solenoid valve power supply line VR is faulty;

[0024] When the power supply line is normal and there is no open circuit, MR and VR are both power supply voltage +12V. If the voltage divider resistor ratio is 3:1, that is, a combination of 30K and 10K, then at this time, 3V can be detected through the network port ADC_SUP and the load detection port SUP; when the power supply line is normal but there is an open circuit, only 0V can be detected through the network port ADC_SUP and the load detection port SUP. This can be used to determine whether there is a problem with the power supply line and whether the redundant power supply module needs to be started.

[0025] If detection is to be performed through the power supply feedback loop part 3, the function is to instruct to turn on the corresponding MOS tube when a certain line is open. It is necessary to know whether the MOS tube is turned on. If it is turned on correctly, there is a 12V voltage at the corresponding power supply feedback loop part 3, which can also be used to determine the detection.

[0026] A driver chip, used for receiving a bootstrap signal from a microcontroller unit MCU and then generating a drive signal CP to send to a motor power supply MR part 1 and a solenoid valve power supply VR part 2;

[0027] The microcontroller unit MCU is respectively connected to the motor power supply MR part 1, the solenoid valve power supply VR part 2 and the power supply feedback loop part 3, and is used to obtain the detection result of whether the power supply of the motor power supply line MR / the solenoid valve power supply line VR is faulty from the power supply feedback loop part 3, and then combine the drive chip feedback to control the operation of the motor power supply MR part 1 and the solenoid valve power supply VR part 2.

[0028] Combined with the driving chip feedback control, the motor power supply MR part 1 and the solenoid valve power supply VR part 2 work, specifically including directly sending the level control signal from the driving signal ports ACT_A and ACT_B to the motor power supply MR part 1 and the solenoid valve power supply VR part 2, and at the same time sending the bootstrap signal to the driving chip to generate the driving signal CP respectively to the motor power supply MR part 1 and the solenoid valve power supply VR part 2, thereby driving the power supply respectively.

[0029] The driving signal ports ACT_A and ACT_B are used to control the operation of the motor power supply MR part 1, that is, whether it is turned on. Specifically, port ACT_A controls the operation of the motor power supply MR part 1, that is, whether it is turned on, and port ACT_B controls the operation of the motor power supply VR part 2, that is, whether it is turned on.

[0030] The load detection port SUP is essentially a load network, which is used to detect whether the voltage of the power supply line MR or VR is loaded on this point.

[0031] like Figure 1 As shown, the motor power supply MR part 1 includes a MOS tube Q2, a diode D2, a diode D4, a triode Q4, a triode Q6, a resistor R5, a resistor R9, a resistor R10, a resistor R12, a resistor R14, a resistor R16, a capacitor C3 and a capacitor C5; the motor power supply line MR is connected to the drain of the No. 2 pin of the MOS tube Q2, the source of the No. 3 pin of the MOS tube Q2 is connected to the load detection port SUP and connected to the source of the No. 3 pin of the MOS tube Q1 of the solenoid valve power supply VR part 2; the diode D2 and the diode D4 are reversely connected in series and then connected in parallel with the resistor R5, wherein the positive electrodes of the diode D2 and the diode D4 are connected, and at the same time, the two ends of the resistor R5 are connected between the gate of the No. 1 pin of the MOS tube Q2 and the source of its own No. 3 pin; the gate of the No. 1 pin of the MOS tube Q2 is connected via the resistor R9 and The collector of pin 2 of transistor Q4 is connected, capacitor C3 is connected between the collector of pin 2 and the emitter of pin 3 of transistor Q4, the emitter of pin 3 of transistor Q4 is connected to the drive signal CP, and at the same time, the emitter of pin 3 of transistor Q4 is connected to the emitter of pin 3 of transistor Q3 of solenoid valve power supply VR part 2, and resistor R10 is connected between the base of pin 1 and the emitter of pin 3 of transistor Q4; the base of pin 1 of transistor Q4 is connected to the collector of pin 3 of transistor Q6 through resistor R12 and resistor R14 in sequence, the emitter of pin 1 of transistor Q6 is grounded, the base of pin 2 of transistor Q6 is connected to the motor drive signal port ACT_A of the microcontroller unit MCU, and the base of pin 2 of transistor Q6 is grounded through resistor R16 and capacitor C5 respectively.

[0032] like Figure 1As shown, the motor power supply MR part 1 includes a MOS tube Q1, a diode D1, a diode D3, a triode Q3, a triode Q4, a resistor R4, a resistor R8, a resistor R7, a resistor R11, a resistor R13, a resistor R15, a capacitor C2 and a capacitor C4; the solenoid valve power supply line VR is connected to the drain of the No. 2 pin of the MOS tube Q1, the source of the No. 3 pin of the MOS tube Q1 is connected to the load detection port SUP and connected to the source of the No. 3 pin of the MOS tube Q2 of the motor power supply MR part 1; the diode D1 and the diode D3 are reversely connected in series and then connected in parallel with the resistor R4, wherein the positive electrodes of the diode D1 and the diode D3 are connected, and at the same time, the two ends of the resistor R4 are connected between the gate of the No. 1 pin of the MOS tube Q1 and the source of its own No. 3 pin; the 1 The gate of pin No. 1 is connected to the collector of pin No. 2 of transistor Q3 through resistor R8, capacitor C2 is connected between the collector of pin No. 2 and the emitter of pin No. 3 of transistor Q3, emitter of pin No. 3 of transistor Q3 is connected to the emitter of pin No. 3 of transistor Q4 of solenoid valve power supply VR part 2, resistor R7 is connected between the base of pin No. 1 and the emitter of pin No. 3 of transistor Q3; the base of pin No. 1 of transistor Q3 is connected to the collector of pin No. 3 of transistor Q5 through resistor R11 and resistor R13 in sequence, the emitter of pin No. 1 of transistor Q5 is grounded, the base of pin No. 2 of transistor Q5 is connected to the solenoid valve drive signal port ACT_B of the micro control unit MCU, and the base of pin No. 2 of transistor Q5 is grounded through resistor R15 and capacitor C4 respectively.

[0033] In a specific implementation, the sources of pin 3 of MOS transistor Q1 and MOS transistor Q2 are directly connected to the load detection port SUP, and are also connected to the network port ADC_SUP via the power supply feedback loop part 3; the emitters of pin 3 of transistor Q3 and transistor Q4 are connected and are both connected to the drive signal CP via resistor R6.

[0034] Specifically, Figure 1 As shown, the motor power supply line MR is connected to the drain of pin 2 of the MOS tube Q2, the source of pin 3 of the MOS tube Q2, pin 1 of the resistor R5, the cathode of pin 4 of the diode D2, the cathode of pin 4 of the diode D1, pin 1 of the resistor R4, the source of pin 3 of the MOS tube Q1, and pin 2 of the resistor R2 are all connected to the load detection port SUP.

[0035] Pin 1 of the resistor R2, pin 1 of the resistor R3, and pin 1 of the capacitor C1 are all connected to the network port ADC_SUP, pin 2 of the capacitor C1 is grounded, and pin 2 of the resistor R3 is grounded.

[0036] The gate of pin 1 of MOS tube Q2 is connected to pin 2 of resistor R5, cathode of pin 4 of diode D4, and pin 2 of resistor R9 respectively, and the anode of pin 3 of diode D2 is connected to anode 3 of diode D4.

[0037] Pin 1 of resistor R9 is respectively connected to the collector of pin 2 of transistor Q4 and pin 2 of capacitor C3, base 1 of transistor Q4 is connected to pin 1 of resistor R12 and pin 2 of resistor R10, pin 1 of resistor R10 is respectively connected to the emitter of pin 3 of transistor Q4, pin 1 of capacitor C3, pin 1 of resistor R6, emitter of pin 3 of transistor Q3, pin 1 of resistor R7 and pin 1 of capacitor C2, and pin 2 of resistor R6 is connected to the drive signal CP.

[0038] Pin 1 of resistor R14 is connected to the collector of pin 3 of transistor Q6, the emitter of pin 1 of transistor Q6 is grounded, the base of pin 2 of transistor Q6, pin 1 of resistor R16, and pin 1 of capacitor C5 are all connected to the motor drive signal port ACT_A, pin 2 of resistor R16 is grounded, and pin 2 of capacitor C5 is grounded.

[0039] The solenoid valve power supply line VR is connected to the drain of pin 2 of MOS tube Q1, the gate of pin 1 of MOS tube Q2 is connected to pin 2 of resistor R4, the cathode of pin 4 of diode D3, and pin 2 of resistor R8 respectively, the anode of pin 3 of diode D1 is connected to the anode of diode D3, the pin 1 of resistor R8 is connected to the collector of pin 2 of transistor Q3 and pin 2 of capacitor C2 respectively, the base of pin 1 of transistor Q3 is connected to the collector of pin 2 of resistor R7 respectively, and the base of pin 2 of transistor Q3 is connected to the collector of pin 3 of transistor R7 respectively. Pin 2 and pin 1 of resistor R11 are connected, pin 2 of resistor R11 and pin 2 of resistor R13 are connected, pin 1 of resistor R13 is connected to collector 3 of transistor Q5, emitter of pin 1 of transistor Q5 is grounded, base of pin 2 of transistor Q5, pin 1 of resistor R15, and pin 1 of capacitor C4 are all connected to solenoid valve drive signal port ACT_B, pin 2 of resistor R15 is grounded, and pin 2 of capacitor C4 is grounded.

[0040] The power supply feedback loop part 3 includes a capacitor C1, a resistor R2 and a resistor R3. The detection port ADC_SUP of the microcontroller unit MCU is grounded via the capacitor C1 and the resistor R3 respectively. The detection port ADC_SUP of the microcontroller unit MCU is connected to the source of pin No. 3 of the MOS tube Q1 in the motor power supply MR part 1 and the source of pin No. 3 of the MOS tube Q2 in the solenoid valve power supply VR part 2 respectively after passing through the resistor R2.

[0041] In a specific implementation, the MOS transistor Q1 is an NMOS transistor, the MOS transistor Q2 is an NMOS transistor, the transistor Q3 is a PNP transistor, the transistor Q4 is a PNP transistor, the transistor Q5 is an NPN transistor, and the transistor Q6 is an NPN transistor.

[0042] Diode D1 and diode D3 are voltage stabilizing diodes, which are used to protect the voltage between source terminal 3 and gate terminal 1 of MOS tube Q1 from exceeding ±20V. Resistor R4 is used to stabilize the potential of pin 1 of MOS tube Q1 to prevent malfunction of the MOS tube.

[0043] Diode D2 and diode D4 are voltage stabilizing diodes, which are used to protect the voltage between source terminal 3 and gate terminal 1 of MOS tube Q2 from exceeding ±20V. Resistor R5 is used to stabilize the potential of pin 1 of MOS tube Q2 to prevent malfunction of the MOS tube.

[0044] The voltage divider circuit composed of resistors R2 and R3 detects whether the voltage at the load detection port SUP is abnormal in real time through the ADC port of the microcontroller unit MCU. Specifically:

[0045] Figure 1 In the circuit, the solenoid valve power supply analog-to-digital acquisition port ADC_VR and the motor power supply analog-to-digital acquisition port ADC_MR are detected through their two voltage-dividing resistors. If the voltage detected is greater than 2V when it is not open, when the voltage detected is less than 0.5V, it is considered that the power line where the port is located is open. At this time, the power line that is not open will start the corresponding MOS tube to load the power supply to the power line at the other end that is open.

[0046] In a specific implementation, the voltage of the solenoid valve power supply line VR and the motor power supply line MR is the vehicle battery voltage of 13.5V; the drive signal CP is a bootstrap voltage, which is generally twice the power supply voltage, that is, 27V.

[0047] 1) When there is no power failure in the motor power supply line MR and a power failure in the solenoid valve power supply line VR, the motor drive signal port ACT_A of the microcontroller unit MCU outputs a high level of 3.3V, and at the same time, the solenoid valve drive signal port ACT_B of the microcontroller unit MCU outputs a low level of 0V, and the microcontroller unit MCU controls the drive chip to generate a drive signal CP with a drive voltage of 27V;

[0048] Since the motor drive signal port ACT_A of the microcontroller unit MCU outputs a high level of 3.3V, the voltage difference between the base and emitter of transistor Q6 is 3.3V and greater than the on-state voltage of 0.7V, causing transistor Q6 to be turned on, and the collector of its pin 3 is 0V. At this time, the drive signal CP passes through the current limiting resistor R12 and the resistor R14, and then the transistor Q6 is grounded; at this time, the voltage difference between the emitter of pin 3 of transistor Q4 and the base of pin 1 is greater than 0.7V, causing transistor Q4 to be turned on, and the collector of pin 2 of transistor Q4 is connected to the collector of pin 3. The emitter potential of the pin is consistent with 27V, so that the driving voltage of the driving signal CP passes through the current limiting resistor R9 to the gate of the MOS tube Q2; at this time, the voltage difference between the gate of pin 1 and the drain of pin 2 of the MOS tube Q2 is +13.5V, which meets the opening condition of the MOS tube Q2, causing the MOS tube Q2 to be turned on, and the drain of pin 2 of the MOS tube Q2 is consistent with the source voltage of pin 3 of the MOS tube Q2, both of which are 13.5V, the voltage of the motor power supply line MR. This voltage is loaded to the load detection port SUP and supplies power to the load detection port SUP.

[0049] Since the solenoid valve drive signal port ACT_B of the microcontroller unit MCU outputs a low level of 0V, the voltage difference between the base and emitter of the transistor Q5 is 0V and is less than the conduction voltage of 0.7V, causing the transistor Q5 to be non-conductive; at this time, the emitter potential of pin 3 of the transistor Q3 is 27V, and the base potential of pin 1 of the transistor Q3 is 27V, then the voltage difference between the emitter of pin 3 of the transistor Q3 and the base of pin 1 is 0V, which is less than the conduction voltage of 0.7V, causing the transistor Q3 to be non-conductive, and the drive voltage of the drive signal CP cannot be loaded to the gate of pin 1 of the MOS tube Q1 through the transistor Q3, causing the MOS tube Q1 to be non-conductive, and the solenoid valve power supply line VR cannot be loaded to the load detection port SUP.

[0050] 2) When the motor power supply line MR has a power failure and the solenoid valve power supply line VR has no power failure, the motor drive signal port ACT_A of the microcontroller unit MCU outputs a low level of 0V, and the solenoid valve drive signal port ACT_B of the microcontroller unit MCU outputs a high level of 3.3V, and the microcontroller unit MCU controls the drive chip to generate a drive signal CP with a drive voltage of 27V;

[0051] Since the motor drive signal port ACT_A of the microcontroller unit MCU outputs a low level of 0V, the voltage difference between the base and emitter of transistor Q6 is 0V and is less than the conduction voltage of 0.7V, causing transistor Q6 to be non-conductive; at this time, the emitter potential of pin 3 of transistor Q4 is 27V, and the base potential of pin 1 of transistor Q4 is 27V, then the voltage difference between the emitter of pin 3 of transistor Q4 and the base of pin 1 is 0V, which is less than the conduction voltage of 0.7V, causing transistor Q4 to be non-conductive, and the driving voltage of the driving signal CP cannot be loaded to the gate of pin 1 of MOS tube Q2 through transistor Q4, causing MOS tube Q1 to be turned off and non-conductive, and the solenoid valve power supply line VR cannot be loaded to the load detection port SUP.

[0052] Since the solenoid valve drive signal port ACT_B of the microcontroller unit MCU outputs a high level of 3.3V, the voltage difference between the base and emitter of transistor Q5 is 27V and less than the conduction voltage of 0.7V, causing transistor Q5 to be turned on, and its No. 3 pin collector is 0V. At this time, the drive signal CP passes through the current limiting resistor R13 and the resistor R11, and then the transistor Q5 is grounded; at this time, the voltage difference between the emitter of No. 3 pin of transistor Q3 and the base of No. 1 pin is greater than 0.7V, causing transistor Q3 to be turned on, and the collector of No. 2 pin of transistor Q3 and the emitter potential of No. 3 pin are equal to 0.7V. The voltages of the driving signal CP are consistent with each other, and the driving voltage of the driving signal CP passes through the current limiting resistor R8 to the gate of the MOS tube Q1; at this time, the voltage difference between the gate of pin 1 and the drain of pin 2 of the MOS tube Q1 is +13.5V, which meets the opening condition of the MOS tube Q1, causing the MOS tube Q1 to be turned on, and the drain of pin 2 of the MOS tube Q1 is consistent with the source voltage of pin 3 of the MOS tube Q1, which are both 13.5V, the voltage of the solenoid valve power supply line VR, and finally the voltage of the solenoid valve power supply line VR is loaded to the load detection port SUP and the load detection port SUP is powered.

[0053] 3) When there is no power failure in the motor power supply line MR and the solenoid valve power supply line VR, the motor drive signal port ACT_A and the solenoid valve drive signal port ACT_B of the microcontroller unit MCU both output a low level of 0V, so that the MOS tube Q1 and the MOS tube Q2 are both not conducting, so that the solenoid valve power supply line VR only supplies power to the solenoid valve, and the motor power supply line MR only supplies power to the motor.

[0054] Through the above control, when the motor power supply line MR fails to disconnect, the solenoid valve power supply line VR can be used as a redundant power supply line for the motor through circuit switching operation.

[0055] When the solenoid valve power supply line VR fails to disconnect, the motor power supply line MR can be used as a redundant power supply line for the solenoid valve through circuit switching operation.

[0056] That is, when one of the power supplies of the motor power supply line MR and the solenoid valve power supply line VR fails, the power supply line that is not open will start the corresponding MOS tube to load the power to the other port to ensure that the other load can work.

Claims

1. A switch control circuit with redundant power supply, Features: It includes a motor power supply MR part (1) and a solenoid valve power supply VR part (2) connected to each other and a power supply feedback loop part (3); The motor power supply MR part (1) is connected to the motor power supply line MR and the motor, respectively, and is used to receive signals from the micro control unit MCU and the driver chip to control the conduction of the circuit from the motor power supply line MR to the motor power supply; The solenoid valve power supply VR part (2) is connected to the solenoid valve power supply line VR and the solenoid valve, respectively, and is used to receive signals from the microcontroller unit MCU and the driver chip to control the conduction of the circuit from the solenoid valve power supply line VR to the solenoid valve power supply; The power supply feedback loop part (3) is connected between the motor power supply MR part (1) and the solenoid valve power supply VR part (2) and the load detection port SUP, and is used to detect whether the power supply of the motor power supply line MR and the solenoid valve power supply line VR is faulty; A driver chip, used for receiving a bootstrap signal from a microcontroller unit MCU and then generating a drive signal CP to send to a motor power supply MR part (1) and a solenoid valve power supply VR part (2); The microcontroller unit MCU is respectively connected to the motor power supply MR part (1), the solenoid valve power supply VR part (2) and the power supply feedback loop part (3), and is used to obtain the detection result of whether the power supply of the motor power supply line MR / the solenoid valve power supply line VR is faulty from the power supply feedback loop part (3), and then combine the feedback of the driver chip to control the operation of the motor power supply MR part (1) and the solenoid valve power supply VR part (2).

2. A switch control circuit with redundant power supply according to claim 1, Features: The motor power supply MR part (1) includes a MOS tube Q2, a diode D2, a diode D4, a transistor Q4, and a transistor Q6; the motor power supply line MR is connected to the drain of the MOS tube Q2, and the source of the MOS tube Q2 is connected to the load detection port SUP. The diode D2 and the diode D4 are connected in reverse series and then connected in parallel with the resistor R5, and both ends of the resistor R5 are connected between the gate and the source of the MOS transistor Q2; the gate of the MOS transistor Q2 is connected to the collector of the transistor Q4 via the resistor R9, the capacitor C3 is connected between the collector and the emitter of the transistor Q4, the emitter of the transistor Q4 is connected to the drive signal CP, the emitter is connected to the solenoid valve power supply VR part (2), and the resistor R10 is connected between the base and the emitter of the transistor Q4; the base of the transistor Q4 is connected to the collector of the transistor Q6 via the resistor R12 and the resistor R14 in sequence, the emitter of the transistor Q6 is grounded, the base of the transistor Q6 is connected to the motor drive signal port ACT_A of the micro control unit MCU, and the base of the transistor Q6 is grounded via the resistor R16 and the capacitor C5 respectively.

3. A switch control circuit with redundant power supply according to claim 2, Features: The motor power supply MR part (1) includes a MOS tube Q1, a diode D1, a diode D3, a transistor Q3, and a transistor Q4; the solenoid valve power supply line VR is connected to the drain of the MOS tube Q1, and the source of the MOS tube Q1 is connected to the load detection port SUP. The diode D1 and the diode D3 are connected in series with each other in reverse order and then connected in parallel with the resistor R4. Meanwhile, both ends of the resistor R4 are connected between the gate and source of the MOS transistor Q1. The gate of the MOS transistor Q1 is connected to the collector of the transistor Q3 via the resistor R8. The capacitor C2 is connected between the collector and the emitter of the transistor Q3. The emitter of the transistor Q3 is connected to the emitter of the transistor Q4 of the solenoid valve power supply VR part (2). The resistor R7 is connected between the base and the emitter of the transistor Q3. The base of the transistor Q3 is connected to the collector of the transistor Q5 via the resistor R11 and the resistor R13 in sequence. The emitter of the transistor Q5 is grounded. The base of the transistor Q5 is connected to the solenoid valve drive signal port ACT_B of the micro control unit MCU. Meanwhile, the base of the transistor Q5 is grounded via the resistor R15 and the capacitor C4.

4. A switch control circuit with redundant power supply according to claim 1, 2 or 3, Features: The power supply feedback loop part (3) comprises a capacitor C1, a resistor R2 and a resistor R3. The detection port ADC_SUP of the microcontroller unit MCU is grounded via the capacitor C1 and the resistor R3 respectively. The detection port ADC_SUP of the microcontroller unit MCU is connected to the source of the MOS tube Q1 in the motor power supply MR part (1) and the source of the MOS tube Q2 in the solenoid valve power supply VR part (2) respectively via the resistor R2.

5. A switch control circuit with redundant power supply according to claim 3, Features: The MOS tube Q1 is an NMOS tube, the MOS tube Q2 is an NMOS tube, the transistor Q3 is a PNP tube, the transistor Q4 is a PNP tube, the transistor Q5 is an NPN tube, and the transistor Q6 is an NPN tube.

6. A switch control circuit with redundant power supply according to claim 3, Features: The diodes D1 to D4 are all voltage-stabilizing diodes.

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