CN205429701U - Safety protection circuit of pure electric vehicles motor - Google Patents
Safety protection circuit of pure electric vehicles motor Download PDFInfo
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- CN205429701U CN205429701U CN201620145907.1U CN201620145907U CN205429701U CN 205429701 U CN205429701 U CN 205429701U CN 201620145907 U CN201620145907 U CN 201620145907U CN 205429701 U CN205429701 U CN 205429701U
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Abstract
The utility model relates to a safety protection circuit of pure electric vehicles motor, including the pulse signal rectification filter circuit who is arranged in receiving the pulse signal of machine controller microcontroller MCU output, its output links to each other with voltage comparison circuit's input, voltage comparison circuit's output links to each other with many signals logical operation circuit's input, many signals logical operation circuit's output and trouble latch with reset circuit's input continuously, the trouble latchs with reset circuit's output continuously with the input of high voltage isolation circuit, the control end of the relay among the output of high voltage isolation circuit and the relay control circuit links to each other, machine controller's three -phase driving signal U, V, W passes through relay normal close termination motor M's triple line, the relay is normally opened the end and is connect high pressure ground through the power resistor. The utility model discloses integrated trouble control and safety protection in an organic whole, the safety to motor and vehicle that can be quick, safe, reliable is protected.
Description
Technical field
This utility model relates to electric automobile automatic control technology field, the safety protective circuit of a kind of pure electric automobile motor.
Background technology
Pure electric automobile typically uses high-voltage motor to drive, can cause that motor output torque is less than normal, bigger than normal, motor speed is uncontrollable if electric machine controller breaks down or drive high pressure to reveal, any of the above described a kind of phenomenon is all that vehicle driver is uncontrollable, once occur to damage vehicle, affecting the safety traffic of vehicle, serious may jeopardize driver's personal safety.
At present, the measure used primarily focuses on the monitoring of motor three-phase current, mainly electric current pile defection, current peak detection etc., and the measure taked is to close motor drive signal.If drive circuit also there occurs fault when current failure being detected, or current failure is caused by driving malfunction, the method is by invalid, signal is driven only to can guarantee that the uncontrolled system of motor controls because closing, do not ensure that other fault-signals are to motor maloperation, and the method lacks the consideration to vehicle safety, say that very first time when fault occurs should not be to deshield or search the source of trouble and should be guarantee safety from a safety viewpoint, deshield the most again or search the source of trouble, and in order to ensure effective execution of safe action, functional unit and safe unit should be independent, to prevent common cause failure.
Utility model content
The purpose of this utility model is that providing a kind of can trigger safety protective circuit when the fault that the fault or other monitored module that monitor MCU in electric machine controller occur; ensure the status safety, controlled of motor, it is ensured that the safety protective circuit of the pure electric automobile motor of driver and vehicle safety.
nullFor achieving the above object，This utility model have employed techniques below scheme: the safety protective circuit of a kind of pure electric automobile motor，Including for receiving the pulse signal current rectifying and wave filtering circuit of the pulse signal of microcontroller output in electric machine controller，Its outfan is connected with the input of voltage comparator circuit，The outfan of voltage comparator circuit is connected with the input of multi signal logical operation circuit，The outfan of multi signal logical operation circuit is connected with the input of fault latch and reset circuit，Fault latch is connected with the input of high_voltage isolation circuit with the outfan of reset circuit，The outfan of high_voltage isolation circuit is connected with the control end of the relay in control relay circuit，Three-phase driving signal U of electric machine controller、V、W is by the triple line of described relay normally closed termination motor M，Described relay normally open end connects high pressure ground by power resistor.
Described pulse signal current rectifying and wave filtering circuit is by transformator T, full bridge rectifier and filter capacitor C1 composition, the pulse signal of microcontroller output in one termination electric machine controller of transformator T primary coil, other end ground connection, the secondary coil of transformator T with by diode D1, D2, D3, the input of the full bridge rectifier of D4 composition is connected, the outfan of full bridge rectifier is connected with the input of voltage comparator circuit by filter capacitor C1, described voltage comparator circuit uses voltage comparator U1, one end of filter capacitor C1 is connected between the outfan of full bridge rectifier and the normal phase input end of voltage comparator U1, the other end ground connection of filter capacitor C1, the anti-phase input termination reference voltage V of voltage comparator U1ref, the outfan of voltage comparator U1 is connected with the input of multi signal logical operation circuit.
Described multi signal logical operation circuit use including at least two inputs with door, with the outfan that the first input end of door connects voltage comparator circuit, the low and high level fault-signal that in the input termination electric machine controller of first input end non-with door, monitored module sends, described fault latch and reset circuit use rest-set flip-flop, being connected with the set end of rest-set flip-flop with the outfan of door, the Q output of rest-set flip-flop is connected with the input of high_voltage isolation circuit.
Described high_voltage isolation circuit uses optocoupler, described control relay circuit uses relay K 1, K2, K3, described power resistor uses resistance R2, R3, R4, the input of described optocoupler controls foot and connects the outfan of fault latch and reset circuit, the control foot of the output pin of optocoupler contact relay K1, K2, K3 respectively, three-phase driving signal U of electric machine controller, V, W one_to_one corresponding respectively is connected with motor triple line by relay K 1, the normal-closed end of K2, K3, and relay K 1, the normally opened end one_to_one corresponding respectively of K2, K3 connect high pressure ground by resistance R2, R3, R4.
Described and Men Weisan inputs and door, three inputs input termination signal Fault_1 with the second of door, three inputs and the 3rd of door input termination signal Fault_2, signal Fault_1, signal Fault_2 is monitored the low and high level fault-signal that module sends in being electric machine controller.
As shown from the above technical solution, the integrated failure monitoring of this utility model and safeguard protection are in one, it is possible to the safety to motor and vehicle quick, safe and reliable is protected；This utility model can not only be real-time the duty of monitoring electric machine controller MCU, additionally it is possible to be extended easily by multi signal logical operation circuit, and then monitor the duty of other modules；This utility model uses relay normal-closed end as the junction point of motor Yu three-phase control signal, decreases the on-off times of relay and then reduces the probability of failure of relay itself, makes that circuit is more reliable, safety.
Accompanying drawing explanation
Fig. 1 is circuit theory diagrams of the present utility model.
Detailed description of the invention
As shown in Figure 1, a kind of safety protective circuit of pure electric automobile motor, including for receiving the pulse signal current rectifying and wave filtering circuit 1 of the pulse signal of microcontroller output in electric machine controller, its outfan is connected with the input of voltage comparator circuit, the outfan of voltage comparator circuit is connected with the input of multi signal logical operation circuit 2, the outfan of multi signal logical operation circuit 2 is connected with the input of fault latch and reset circuit 3, fault latch is connected with the input of high_voltage isolation circuit 4 with the outfan of reset circuit 3, the outfan of high_voltage isolation circuit 4 is connected with the control end of the relay in control relay circuit 5, three-phase driving signal U of electric machine controller, V, W is by the triple line of described relay normally closed termination motor M, described relay normally open end connects high pressure ground by power resistor.By the pulse signal detection microcontroller whether fault of microcontroller output in electric machine controller, the pulse signal of microcontroller output obtains DC voltage after transformator transmission, full-bridge diode rectification, capacitor filtering.Multiple failure monitoring and latch reset function is realized by multi signal logical operation circuit 2, fault latch and reset circuit 3.Transmitted by the normally closed realization of relay driving signal under normal circumstances, realize active short circuit dischange function during fault by the normally opened point of relay.
As shown in Figure 1, described pulse signal current rectifying and wave filtering circuit 1 is by transformator T, full bridge rectifier and filter capacitor C1 composition, the pulse signal of microcontroller output in one termination electric machine controller of transformator T primary coil, other end ground connection, the secondary coil of transformator T with by diode D1, D2, D3, the input of the full bridge rectifier of D4 composition is connected, the outfan of full bridge rectifier is connected with the input of voltage comparator circuit by filter capacitor C1, described voltage comparator circuit uses voltage comparator U1, one end of filter capacitor C1 is connected between the outfan of full bridge rectifier and the normal phase input end of voltage comparator U1, the other end ground connection of filter capacitor C1, the anti-phase input termination reference voltage V of voltage comparator U1ref, the outfan of voltage comparator U1 is connected with the input of multi signal logical operation circuit 2.Described pulse signal is input to voltage comparator circuit after transformator T transmission, full bridge rectifier, filter capacitor C1 filtering, the fault-signal of the outfan of voltage comparator circuit and other monitored module output of electric machine controller does logic and operation by multi signal logical operation circuit 2, operation result is input to the set end of fault latch and reset circuit 3, and latch result controls the adhesive of relay by high_voltage isolation circuit 4.
As shown in Figure 1, described multi signal logical operation circuit 2 use including at least two inputs with door, with the outfan that the first input end of door connects voltage comparator circuit, the low and high level fault-signal that in the input termination electric machine controller of first input end non-with door, monitored module sends, described fault latch and reset circuit 3 use rest-set flip-flop, being connected with the set end of rest-set flip-flop with the outfan of door, the Q output of rest-set flip-flop is connected with the input of high_voltage isolation circuit 4.Described and Men Weisan inputs and door, three inputs input termination signal Fault_1 with the second of door, three inputs and the 3rd of door input termination signal Fault_2, signal Fault_1, signal Fault_2 is monitored the low and high level fault-signal that module sends in being electric machine controller.
As shown in Figure 1, described high_voltage isolation circuit 4 uses optocoupler, described control relay circuit 5 uses relay K 1, K2, K3, described power resistor uses resistance R2, R3, R4, the input of described optocoupler controls foot and connects fault latch and the outfan of reset circuit 3, the output pin of optocoupler contact relay K1 respectively, K2, the control foot of K3, three-phase driving signal U of electric machine controller, V, W is the most correspondingly by relay K 1, K2, the normal-closed end of K3 is connected with motor triple line, relay K 1, K2, the normally opened end of K3 is the most correspondingly by resistance R2, R3, R4 connects high pressure ground.
Below in conjunction with Fig. 1, this utility model is further described.
Signal Fault_1 and signal Fault_2 can be the fault-signal of other the monitored module in whole electric machine controller, as three-phase current unbalance signal, motor driven voltage overvoltage/undervoltage and DC inversion drive signal open circuit, power supply overvoltage/undervoltage signal etc..
Reference voltage VrefShould debug according to the dutycycle of actually used pulse signal and amplitude, it is ensured that at the dutycycle internal reference voltage V setrefLess than U.
When motor controller system normally works, what the microcontroller in electric machine controller sent is input to Pulse end for pulse signal, and pulse signal is input to full bridge rectifier rectification through transformator T, and filter capacitor C1 is filtered, obtaining effective DC voltage U, U is more than reference voltage Vref, voltage comparator output is pulled upward to high level through resistance R1；When signal Fault_1 and signal Fault_2 is all high level, now three inputs export high level signal with door, rest-set flip-flop Q end output low level, driving optocoupler does not turns on, relay does not has driving voltage, remaining stationary state in contact, electric machine controller three-phase signal is input to motor M by the normally closed point of relay；
When the microcontroller fault in electric machine controller cannot output pulse signal Pulse time; or the module of signal Fault_1 and signal Fault_2 monitoring sends level fault signal and makes signal Fault_1 or signal Fault_2 be low level; now with door output low level; the Q end output high level of rest-set flip-flop makes optocoupler turn on; then 24V voltage is made to be input to relay; relay normal-closed end disconnects, normally opened end adhesive, and diode D5 is for protecting when relay discharges.While disconnecting the motor M connection with electric machine controller three-phase drive, it is connected to high pressure ground by three discharge resistances i.e. resistance R2, R3, R4, makes motor M be in safe state, accident that vehicle because motor uncontrollable cause is reduced or avoided.The resistance of three discharge resistances of regulation can adjust the smoothness of current curve when motor M enters guard mode simultaneously, and resistance is the least, and the current curve that motor M enters guard mode is the mildest；Resistance is the biggest, and the current curve that motor M enters guard mode is the most precipitous.Should suitably adjust resistance so that motor M current curve during entering guard mode is mild, is unlikely to so that motor status changes suddenly.
In sum, the integrated failure monitoring of this utility model and safeguard protection are in one, it is possible to the safety to motor and vehicle quick, safe and reliable is protected；This utility model can not only be real-time the duty of monitoring electric machine controller MCU, additionally it is possible to be extended easily by multi signal logical operation circuit, and then monitor the duty of other modules.
Claims (5)
- null1. the safety protective circuit of a pure electric automobile motor，It is characterized in that: include for receiving the pulse signal current rectifying and wave filtering circuit (1) of the pulse signal of microcontroller output in electric machine controller，Its outfan is connected with the input of voltage comparator circuit，The outfan of voltage comparator circuit is connected with the input of multi signal logical operation circuit (2)，The outfan of multi signal logical operation circuit (2) is connected with the input of fault latch and reset circuit (3)，Fault latch is connected with the input of high_voltage isolation circuit (4) with the outfan of reset circuit (3)，The outfan of high_voltage isolation circuit (4) is connected with the control end of the relay in control relay circuit (5)，Three-phase driving signal U of electric machine controller、V、W is by the triple line of described relay normally closed termination motor M，Described relay normally open end connects high pressure ground by power resistor.
- nullThe safety protective circuit of pure electric automobile motor the most according to claim 1，It is characterized in that: described pulse signal current rectifying and wave filtering circuit (1) is by transformator T、Full bridge rectifier and filter capacitor C1 composition，The pulse signal of microcontroller output in one termination electric machine controller of transformator T primary coil，Other end ground connection，The secondary coil of transformator T with by diode D1、D2、D3、The input of the full bridge rectifier of D4 composition is connected，The outfan of full bridge rectifier is connected with the input of voltage comparator circuit by filter capacitor C1，Described voltage comparator circuit uses voltage comparator U1，One end of filter capacitor C1 is connected between the outfan of full bridge rectifier and the normal phase input end of voltage comparator U1，The other end ground connection of filter capacitor C1，The anti-phase input termination reference voltage V of voltage comparator U1ref, the outfan of voltage comparator U1 is connected with the input of multi signal logical operation circuit (2).
- The safety protective circuit of pure electric automobile motor the most according to claim 1, it is characterized in that: described multi signal logical operation circuit (2) use including at least two inputs with door, with the outfan that the first input end of door connects voltage comparator circuit, the low and high level fault-signal that in the input termination electric machine controller of first input end non-with door, monitored module sends, described fault latch and reset circuit (3) use rest-set flip-flop, it is connected with the set end of rest-set flip-flop with the outfan of door, the Q output of rest-set flip-flop is connected with the input of high_voltage isolation circuit (4).
- The safety protective circuit of pure electric automobile motor the most according to claim 1, it is characterized in that: described high_voltage isolation circuit (4) uses optocoupler, described control relay circuit (5) uses relay K 1, K2, K3, described power resistor uses resistance R2, R3, R4, the input of described optocoupler controls foot and connects fault latch and the outfan of reset circuit (3), the output pin of optocoupler contact relay K1 respectively, K2, the control foot of K3, three-phase driving signal U of electric machine controller, V, W is the most correspondingly by relay K 1, K2, the normal-closed end of K3 is connected with motor triple line, relay K 1, K2, the normally opened end of K3 is the most correspondingly by resistance R2, R3, R4 connects high pressure ground.
- The safety protective circuit of pure electric automobile motor the most according to claim 3; it is characterized in that: described and Men Weisan input and door; three inputs input termination signal Fault_1 with the second of door; three inputs and the 3rd of door input termination signal Fault_2, signal Fault_1, signal Fault_2 is monitored the low and high level fault-signal that module sends in being electric machine controller.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620145907.1U CN205429701U (en) | 2016-02-28 | 2016-02-28 | Safety protection circuit of pure electric vehicles motor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620145907.1U CN205429701U (en) | 2016-02-28 | 2016-02-28 | Safety protection circuit of pure electric vehicles motor |
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| CN205429701U true CN205429701U (en) | 2016-08-03 |
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| CN201620145907.1U Active CN205429701U (en) | 2016-02-28 | 2016-02-28 | Safety protection circuit of pure electric vehicles motor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105591362A (en) * | 2016-02-28 | 2016-05-18 | 合肥巨一动力系统有限公司 | Safety protection circuit of blade electric vehicle motor |
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2016
- 2016-02-28 CN CN201620145907.1U patent/CN205429701U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105591362A (en) * | 2016-02-28 | 2016-05-18 | 合肥巨一动力系统有限公司 | Safety protection circuit of blade electric vehicle motor |
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