CN209184231U - Protect circuit in the independent actively short-circuit high-pressure side of electric machine controller - Google Patents

Abstract

The utility model discloses a kind of independent actively short-circuit high-pressure sides of electric machine controller to protect circuit; this circuit includes the IGBT pipe of active short-circuit signal, pwm control signal and electric machine controller, and digital optical coupling isolator, first comparator, the second comparator, push-pull driver, PMOS tube, NMOS tube, first capacitor, the second capacitor and the first to the 19th resistance；Active short-circuit signal inputs first comparator and the second comparator through digital optical coupling isolator respectively, realizes the on-off of the pwm control signal inputted by push-pull driver by PMOS tube and NMOS tube after logic judgment, and realizes and protect to the IGBT pipe of electric machine controller.This circuit overcomes the defect of the alternate active short-circuit protection function of conventional motors, the alternate active short-circuit protection function of motor is still realized when driving chip failure, to avoid hardware random failure bring system risk.

Description

Protect circuit in the independent actively short-circuit high-pressure side of electric machine controller

Technical field

The utility model relates to a kind of independent actively short-circuit high-pressure sides of electric machine controller to protect circuit.

Background technique

In electric vehicle motor controller, when the failures such as over-voltage, overcurrent occurs in system, system can be according to current bus The information such as voltage value, motor speed size, size of current execute corresponding troubleshooting strategy, such as the alternate active of actuating motor Short-circuit function to protect IGBT pipe not damage because of excessive voltage stress, and needs to realize in driving chip failure In the case of, system also can the alternate active short-circuit function of actuating motor.There is no motors for mature commercial driver chip most of at present Alternate active short-circuit function so just needs to execute the control of IGBT pipe according to low-side signal in high-pressure side design logic circuit System.

Currently, active short-circuit protection function alternate for motor, most of implementation are still with commercial driver chip Control object controls driving chip primary side input signal by low-pressure side to realize the defencive function, and when low-pressure side drives core Piece cannot achieve the function in the case where failing, therefore there are some potential safety problemss.

Summary of the invention

The technical problem to be solved by the utility model is to provide a kind of independent actively short-circuit high-pressure sides of electric machine controller to protect Protection circuit, this circuit overcome the defect of the alternate active short-circuit protection function of conventional motors, still realize when driving chip failure The alternate active short-circuit protection function of motor, to avoid hardware random failure bring system risk.

In order to solve the above technical problems, the independent actively short-circuit high-pressure side protection circuit of the utility model electric machine controller includes The IGBT of active short-circuit signal, pwm control signal and electric machine controller is managed, this circuit further includes digital optical coupling isolator, first Comparator, the second comparator, push-pull driver, PMOS tube, NMOS tube, first capacitor, the second capacitor and first to the 19th Resistance；

It is short-circuit that the input terminal cathode of the number optical coupling isolator is with connecting low-pressure side, input terminal anode connects the active Signal, the output end transistor collector low power supply in connection high-pressure side and through first capacitor connection high-pressure side, output end triode Emitter with connecting high-pressure side and connects first comparator reverse input end with the 6th resistance through second resistance through first resistor, the High-pressure side negative voltage is connected through the 4th resistance between two resistance and the 6th resistance, first comparator positive input is through the 7th resistance It is separately connected 3rd resistor and the 5th resistance, 3rd resistor and the 5th resistance other end are born with being separately connected high-pressure side with high-pressure side Voltage, first comparator power end connect high-pressure side, ground terminal connect high-pressure side negative voltage, the 20th resistance connection first ratio Compared with device power end and output end；

Input terminal connection pwm control signal, two power ends of the push-pull driver are separately connected the high power supply in high-pressure side The drain electrode of PMOS tube and the source electrode of NMOS tube, the source electrode connection of PMOS tube are separately connected with high-pressure side negative voltage, two output ends The source electrode of the high power supply in high-pressure side, the 9th resistance connection PMOS tube connects the output end of the second comparator, the tenth electricity with grid, grid The source electrode and grid of resistance connection NMOS tube, the drain electrode of PMOS tube and the drain electrode of NMOS tube are respectively through eleventh resistor and the 12nd electricity Resistance connects the gate pole of the IGBT pipe, and the grid of NMOS tube is through the output end of the 8th resistance connection first comparator；

The output end of second comparator is respectively through the high power supply of the 19th resistance and the second capacitance connection high-pressure side and height Side negative voltage, the high power supply in power end connection high-pressure side, ground terminal is pressed to connect high-pressure side negative voltage, the second comparator reverse input end Digital optical coupling isolator output end transistor emitter, the 17th resistance and the tenth are connected with thirteenth resistor through the 17th resistance High-pressure side negative voltage is connected through the 15th resistance between three resistance, the second comparator positive input connects respectively through the 18th resistance Connect the 14th resistance and the 16th resistance, the other end of the 14th resistance and the 16th resistance be separately connected the low power supply in high-pressure side and High-pressure side negative voltage.

Further, voltage≤- 2V of the high-pressure side negative voltage.

Further, voltage >=13V of the high power supply in the high-pressure side, voltage >=4V of the low power supply in high-pressure side.

Further, the active short-circuit signal can be compiled by the microprocessor or complexity of generation motor three-phase active short-circuit signal The output of journey logical device, the pwm control signal are exported by the IGBT pipe of electric machine controller.

Since the independent actively short-circuit high-pressure side protection circuit of the utility model electric machine controller uses above-mentioned technical proposal, That is this circuit IGBT pipe for including active short-circuit signal, pwm control signal and electric machine controller, and digital optical coupling isolator, First comparator, the second comparator, push-pull driver, PMOS tube, NMOS tube, first capacitor, the second capacitor and first are to 19 resistance；Active short-circuit signal inputs first comparator and the second comparator through digital optical coupling isolator respectively, sentences through logic It has no progeny and realizes the on-off of the pwm control signal inputted by push-pull driver by PMOS tube and NMOS tube, and to electric machine controller IGBT pipe realizes protection.This circuit overcomes the defect of the alternate active short-circuit protection function of conventional motors, when driving chip failure Realize the alternate active short-circuit protection function of motor, still to avoid hardware random failure bring system risk.

Detailed description of the invention

The utility model is described in further detail with embodiment with reference to the accompanying drawing:

Fig. 1 is the independent actively short-circuit high-pressure side protection circuit schematic diagram of the utility model electric machine controller.

Specific embodiment

Embodiment is as shown in Figure 1, the independent actively short-circuit high-pressure side protection circuit of the utility model electric machine controller includes master The IGBT pipe of dynamic short-circuit signal A, pwm control signal B and electric machine controller, this circuit further include digital optical coupling isolator U1, the One comparator U2, the second comparator U3, push-pull driver Q1, PMOS tube Q2, NMOS tube Q3, first capacitor C1, the second capacitor C2 And first to the 19th resistance；

GND, input terminal anode connect the master to the input terminal cathode of the number optical coupling isolator U1 with connecting low-pressure side Dynamic short-circuit signal A, the low power supply 5V_UH in output end transistor collector connection high-pressure side and through first capacitor C1 connection high-pressure side GND_HS_U, output end transistor emitter through first resistor R1 connection high-pressure side GND_HS_U and through second resistance R2 and Six resistance R6 connection first comparator U2 reverse input ends, through the 4th resistance R4 connection between second resistance R2 and the 6th resistance R6 High-pressure side negative voltage N8_HS_U, first comparator U2 positive input are separately connected 3rd resistor R3 and through the 7th resistance R7 Five resistance R5,3rd resistor R3 and the 5th resistance R5 other end with being separately connected high-pressure side GND_HS_U and high-pressure side negative voltage N8_HS_U, GND_HS_U, ground terminal connect high-pressure side negative voltage N8_HS_U to first comparator U2 power end with connecting high-pressure side, 20th resistance R20 connection first comparator U2 power end and output end；

Input terminal connection pwm control signal B, two power ends of the push-pull driver Q1 are separately connected the high electricity in high-pressure side Source V15_HS_U and high-pressure side negative voltage N8_HS_U, two output ends are separately connected drain electrode and the NMOS tube Q3 of PMOS tube Q2 The source electrode of source electrode, PMOS tube Q2 connects the high power supply V15_HS_U in high-pressure side, the source electrode and grid of the 9th resistance R9 connection PMOS tube Q2 Pole, grid connect the output end of the second comparator U3, the source electrode and grid of the tenth resistance R10 connection NMOS tube Q3, PMOS tube Q2 Drain electrode connect the gate pole of the IGBT pipe with twelfth resistor R12 through eleventh resistor R11 respectively with the drain electrode of NMOS tube Q3, Output end of the grid of NMOS tube Q3 through the 8th resistance R8 connection first comparator U2；

The output end of the second comparator U3 is respectively through the high electricity of the 19th resistance R19 and the second capacitor C2 connection high-pressure side Source V15_HS_U connects the high power supply V15_HS_U in high-pressure side, ground terminal connection high pressure with high-pressure side negative voltage N8_HS_U, power end Side negative voltage N8_HS_U, the second comparator U3 reverse input end connect number with thirteenth resistor R13 through the 17th resistance R17 Optical coupling isolator U1 output end transistor emitter, through the 15th resistance between the 17th resistance R17 and thirteenth resistor R13 R15 connection high-pressure side negative voltage N8_HS_U, the second comparator U3 positive input are separately connected the tenth through the 18th resistance R18 It is low that the other end of four resistance R14 and the 16th resistance R16, the 14th resistance R14 and the 16th resistance R16 are separately connected high-pressure side Power supply 5V_UH and high-pressure side negative voltage N8_HS_U.

Preferably, voltage≤- 2V of the high-pressure side negative voltage N8_HS_U.

Preferably, the voltage of voltage >=13V of the high power supply V15_HS_U in the high-pressure side, the low power supply 5V_UH in high-pressure side >= 4V。

Preferably, the active short-circuit signal A can by the microprocessor or complexity of generation motor three-phase active short-circuit signal Programmed logic device output, the pwm control signal B are exported by the IGBT pipe of electric machine controller.

ACPL-M49T chip can be used in digital optical coupling isolator in this circuit, and first comparator and the second comparator can be adopted With TL331 chip, PMOS tube and NMOS tube are respectively BSS84 field-effect tube and 2N7002BK field-effect tube.

This circuit operation principle is as follows:

1.PMOS tube source grade connects the high power supply in high-pressure side, and drain electrode connects IGBT pipe by positive gate-drive eleventh resistor Gate pole, grid are connected to the output end of the second comparator；

2.NMOS tube source grade connects the driving stage shutdown path being made of push-pull driver, and drain electrode passes through negative sense gate-drive the 12 resistance connect the gate pole of IGBT pipe, and grid is connected to the output end of first comparator；

3. first comparator power supply with terminating high-pressure side, ground connection termination high-pressure side negative voltage, positive input connects fixed base Standard, reverse input end divide to obtain by digital optical coupling isolator output end, and the setting of first comparator resistance guarantees in digital light The output of coupling isolator is under low state, and the positive input voltage of first comparator compares higher than reverse input end voltage, first Device output end voltage is high level, when the output of digital optical coupling isolator is 5V high level, the positive input of first comparator Voltage is lower than reverse input end voltage, and first comparator output end voltage is low level；

4. the second comparator power supply terminates the high power supply in high-pressure side, ground connection termination high-pressure side negative voltage, positive input connects solid Determine benchmark, reverse input end divides to obtain by digital optical coupling isolator output end, and resistance setting guarantees in digital light-coupled isolation Device output is under low state, and the positive input voltage of the second comparator is higher than reverse input end voltage, the second comparator exports End voltage is high level, and when the output of digital optical coupling isolator is 5V high level, the positive input voltage of the second comparator is low In reverse input end voltage, the second comparator output terminal voltage is low level；

5. in normal operation, digital optical coupling isolator low-pressure side does not have active short-circuit signal, digital light-coupled isolation Device high-pressure side exports low level, and first comparator and the output of the second comparator are high level, and NMOS transistor conduction is connected to high-pressure side Negative voltage, gate pole close IGBT pipe by normal turn-off path；The shutdown of PMOS pipe disconnects gate pole pull-up path, and gate pole is by just Often control signal is driven；

6. when digital optical coupling isolator low-pressure side receives active short-circuit signal, digital optical coupling isolator high-pressure side exports 5V High-level control signal, first comparator and the output of the second comparator are low level, and NMOS tube disconnects and high-pressure side negative voltage Connection, IGBT pipe gate pole cannot be delayed by driving signal strong pull-down by certain RC, the conducting of PMOS pipe, on IGBT pipe gate pole It draws to high-pressure side high power supply voltage, the conducting of IGBT pipe, bridge IGBT pipe low-pressure side receives same signal on three-phase, and motor can be realized Three-phase active short-circuit protection function.

This circuit is controlled compared with the corresponding IGBT pipe gate pole state in high-pressure side with using driving chip primary-side-control signal, Advantage is will not to fail to realize the alternate active short-circuit protection function of motor because of driving chip, while can also be used as biography The redundancy of system mode, to reduce hardware random failure bring system risk.

Claims (4)

1. circuit is protected in a kind of independent actively short-circuit high-pressure side of electric machine controller, including active short-circuit signal, pwm control signal and The IGBT of electric machine controller is managed, it is characterised in that: this circuit further includes digital optical coupling isolator, first comparator, second compares Device, push-pull driver, PMOS tube, NMOS tube, first capacitor, the second capacitor and the first to the 19th resistance；

The input terminal cathode connection low-pressure side of the number optical coupling isolator, input terminal anode connect active short circuit letter Number, the output end transistor collector low power supply in connection high-pressure side and through first capacitor connection high-pressure side, output end triode sends out Emitter-base bandgap grading connects through first resistor connection high-pressure side and with the 6th resistance first comparator reverse input end through second resistance, and second High-pressure side negative voltage is connected through the 4th resistance between resistance and the 6th resistance, first comparator positive input is through the 7th resistance point Not Lian Jie 3rd resistor and the 5th resistance, 3rd resistor and the 5th resistance other end are with being separately connected high-pressure side and high-pressure side negative electricity Pressure, first comparator power end with connecting high-pressure side, ground terminal connect high-pressure side negative voltage, the connection of the 20th resistance first is compared Device power end and output end；

Input terminal connection pwm control signal, two power ends of the push-pull driver are separately connected the high power supply in high-pressure side and height Pressure side negative voltage, two output ends are separately connected the drain electrode of PMOS tube and the source electrode of NMOS tube, and the source electrode of PMOS tube connects high pressure The source electrode of the high power supply in side, the 9th resistance connection PMOS tube connects the output end of the second comparator with grid, grid, and the tenth resistance connects The source electrode and grid of NMOS tube are connect, the drain electrode of PMOS tube and the drain electrode of NMOS tube connect through eleventh resistor and twelfth resistor respectively The gate pole of the IGBT pipe is connect, the grid of NMOS tube is through the output end of the 8th resistance connection first comparator；

The output end of second comparator is respectively through the high power supply of the 19th resistance and the second capacitance connection high-pressure side and high-pressure side Negative voltage, the high power supply in power end connection high-pressure side, ground terminal connect high-pressure side negative voltage, and the second comparator reverse input end is through the 17 resistance connect digital optical coupling isolator output end transistor emitter, the 17th resistance and the 13rd electricity with thirteenth resistor High-pressure side negative voltage is connected through the 15th resistance between resistance, the second comparator positive input is separately connected the through the 18th resistance The other end of 14 resistance and the 16th resistance, the 14th resistance and the 16th resistance is separately connected the low power supply in high-pressure side and high pressure Side negative voltage.

2. circuit is protected in the independent actively short-circuit high-pressure side of electric machine controller according to claim 1, it is characterised in that: described Voltage≤- 2V of high-pressure side negative voltage.

3. circuit is protected in the independent actively short-circuit high-pressure side of electric machine controller according to claim 1 or 2, it is characterised in that: Voltage >=13V of the high power supply in high-pressure side, voltage >=4V of the low power supply in high-pressure side.

4. circuit is protected in the independent actively short-circuit high-pressure side of electric machine controller according to claim 3, it is characterised in that: described Active short-circuit signal is exported by the microprocessor or Complex Programmable Logic Devices of generation motor three-phase active short-circuit signal, described Pwm control signal is exported by the IGBT pipe of electric machine controller.