Safety circuit control and fault processing system based on hardware

Abstract

The utility model discloses a safety loop control and fault processing system based on hardware, which belongs to the technical field of signal detection and processing and comprises a signal input circuit, a power supply circuit, a signal detection circuit, a delay circuit, an optical coupler isolation circuit and a relay control safety loop circuit. According to the utility model, fault detection, signal processing and safety loop control are realized through a hardware circuit without depending on a microcontroller, so that the problems in the prior art are solved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to signal detection and processing technical field, concretely relates to a kind of safety loop control and fault processing system based on hardware. BACKGROUND

[0002] Electric vehicle, unmanned system and other high-voltage battery systems generally use battery management system (BMS) and insulation monitoring device (IMD) to ensure the electrical safety of the system.

[0003] At present, the detection and processing of battery management system (BMS) and insulation monitoring device (IMD) signals are generally based on microcontroller (MCU) to determine the electrical safety of the system and take corresponding measures. This method may have response delay or failure risk due to program errors when a fault occurs.

[0004] Therefore, a safety loop control and fault processing system based on hardware is designed to solve the above problems. UTILITY MODEL CONTENTS

[0005] To solve the problems raised in the background art, the utility model provides a safety loop control and fault processing system based on hardware, which does not rely on microcontrollers to solve the problems existing in the prior art.

[0006] To achieve the above purpose, the utility model provides the following technical scheme: a safety loop control and fault processing system based on hardware, comprising: a signal input circuit, a power supply circuit, a signal detection circuit, a delay circuit, an opto-coupler isolation circuit and a relay control safety loop circuit, wherein:

[0007] The signal input circuit inputs power supply signals, IMD SIG signals, BMS SIG signals, IMD RESET signals, BMS RESET signals and ASMS signals.

[0008] The power supply circuit converts the required voltage for power supply.

[0009] The signal detection circuit detects whether the IMD SIG signals and the BMS SIG signals have faults.

[0010] The delay circuit buffers to avoid misoperation caused by signal fluctuation.

[0011] The opto-coupler isolation circuit electrically isolates the high-voltage and low-voltage parts to ensure the safety of the system.

[0012] The relay control safety loop circuit disconnects the control loop by relay when a fault is detected, until the manual reset signal triggers recovery.

[0013] Further, the signal input circuit comprises:

[0014] The 1-10 pins of the connector J1 are connected with the 24V 1 power supply end, the GND ground end, the IMD SIG signal end, the IMD RESET signal end, the BMS SIG signal end, the BMS RESET signal end, the IMD LED1 signal end, the BMS LED1 signal end, the 24V 2 power supply end and the ASMS signal end respectively;

[0015] The 1-2 pins of the connector CN2 are connected with the extravehicular activation signal end, i.e. the A end;

[0016] The 1-2 pins of the connector CN3 are connected with the intravehicular activation signal end, i.e. the E end.

[0017] Further, the power supply circuit comprises a 24V power supply circuit, a 12V power supply circuit and a 5V power supply circuit, wherein:

[0018] The 24V power supply circuit comprises:

[0019] A diode D1, the anode of the diode D1 is connected with the 24V power supply input from the 24V 1 power supply end, the cathode of the diode D1 is connected with a fuse F1, the other end of the fuse F1 is connected with an inductor L1, the other end of the inductor L1 is connected with a capacitor C1 anode, the cathode of the capacitor C1 is connected with the GND ground end, and the 24V power supply is outputted;

[0020] The 12V power supply circuit comprises:

[0021] A resistor R25, one end of the resistor R25 is connected with the outputted 24V power supply, the other end of the resistor R25 is connected with a resistor R28, the other end of the resistor R28 is connected with the GND ground end, and the 12V power supply is outputted;

[0022] The 5V power supply circuit comprises:

[0023] A three-terminal linear voltage regulator U1, the input ends of the three-terminal linear voltage regulator U1 are connected with the 24V power supply, capacitors C2 and C4 respectively, the output ends of the three-terminal linear voltage regulator U1 are connected with the capacitor C3 anode, capacitors C5 and a resistor R1 respectively, the other end of the resistor R1 is connected with the anode of a light-emitting diode D12, the cathode of the capacitor C2, the other end of the capacitor C4, the GND ground end of the three-terminal linear voltage regulator U1, the cathode of the capacitor C3, the other end of the capacitor C5 and the cathode of the light-emitting diode D12 are connected with the CND ground end, and the 5V power supply is outputted.

[0024] Further, the signal detection circuit comprises:

[0025] The power comparator U6, the first and second input terminals of the power comparator U6 are connected with the IMD SIG signal and the BMS SIG signal input from the IMD SIG signal terminal and the BMS SIG signal terminal respectively, the VCC terminal of the power comparator U6 is connected with the 24V power supply, the first and second negative input terminals are connected with the BENCHMARK signal terminal adjusted to 11.3V and the BMSCHECK signal terminal adjusted to 1.5V respectively, the first and second output terminals are connected with the cathodes of the light emitting diodes D13 and D14 respectively, the anodes of the light emitting diodes D13 and D14 are connected with the resistors R22 and R24 respectively, the other ends of the resistors R22 and R24 are connected with the 5V power supply respectively, the GND ground terminal is connected with the GND ground terminal, and the output signal detection result is outputted;

[0026] The voltage adjusting circuit of the BENCHMARK signal terminal comprises:

[0027] The adjustable resistor R27 has three terminals connected with the BENCHMARK signal terminal, the resistor R26 and the GND ground terminal respectively, and the other end of the resistor R26 is connected with the 24V power supply;

[0028] The voltage adjusting circuit of the BMSCHECK signal terminal comprises:

[0029] The adjustable resistor R29 has three terminals connected with the BMSCHECK signal terminal, the 5V power supply and the GND ground terminal respectively.

[0030] Further, the delay circuit comprises an IMD SIG signal delay circuit and a BMS SIG signal delay circuit, wherein:

[0031] The IMD SIG signal delay circuit comprises:

[0032] The resistors R2 and R30 have one end connected with the detected IMD SIG signal, the other end of the resistor R2 is connected with the capacitor C6, the other ends of the capacitor C6 and the resistor R30 are connected with the GND ground terminal, and the IMD SIG1 signal is outputted;

[0033] The BMS SIG signal delay circuit comprises:

[0034] The resistors R3 and R23 have one end connected with the detected BMS SIG signal, the other end of the resistor R3 is connected with the capacitor C7, the other ends of the capacitor C7 and the resistor R23 are connected with the GND ground terminal, and the BMS SIG1 signal is outputted.

[0035] Further, the optical coupling isolation circuit comprises:

[0036] The photoelectric coupler U2, the anode of the four light emitting diodes of the photoelectric coupler U2 is connected with the resistors R4, R5, R6 and R7 respectively, the other end of the resistors R4, R5, R6 and R7 is connected with the cathodes of the diodes D2, D3, D4 and D5 respectively, the anode of the diode D2 is connected with the 12V power supply, the anodes of the diodes D3 and D5 are connected with the 5V power supply, the anode of the diode D4 is connected with the 24V power supply, the cathodes of the four light emitting diodes are connected with the BMS SIG1 signal, the BMS RESET signal input by the BMS SIG signal end, the IMD SIG1 signal and the IMD RESET signal input by the IMD RESET signal end respectively, the emitters of the four photoelectric receiving transistors are connected with the resistors R8, R9, R10 and R11 respectively, the other end of the resistors R8, R9, R10 and R11 is connected with the 5V power supply, the collectors of the two photoelectric receiving transistors connected with the BMS RESET signal and the IMD RESET signal are connected with the capacitors C8 and C9 respectively, the other end of the capacitors C8 and C9 is connected with the resistors R9 and R11 respectively, the collectors of the four photoelectric receiving transistors are connected with the GND ground end, and the BMS SIG2 signal, the BMS RESET1 signal, the IMD SIG2 signal and the IMD RESET1 signal are output respectively.

[0037] Further, the relay control safety circuit comprises a trigger circuit, an insulation monitoring device signal based safety circuit control circuit, a battery management system signal based safety circuit control circuit and a control circuit, wherein:

[0038] The trigger circuit comprises:

[0039] The RS flip-flop U3, the first and second low level effective reset ends of the RS flip-flop U3 are connected with the IMD SIG2 signal and the BMS SIG2 signal respectively, the first and second low level effective set ends of the RS flip-flop U3 are connected with the IMD RESET1 signal and the BMS RESET1 signal respectively, the VCC end of the RS flip-flop U3 is connected with the 24V power supply and the capacitor C10, the other end of the capacitor C10 is connected with the GND ground end, the first and second input ends, the first and second immediate clock signal ends and the GND ground end of the RS flip-flop U3 are connected with the GND ground end, and the first and second low level effective output ends of the RS flip-flop U3 output the IMD LED1 signal and the BMS LED1 signal respectively;

[0040] The insulation monitoring device signal based safety circuit control circuit comprises:

[0041] The resistor R12, one end of the resistor R12 is connected with the IMD LED1 signal, the other end of the resistor R12 is connected with the base of the triode Q2 and the resistor R13 respectively, the emitter of the triode Q2 is connected with the cathode of the light emitting diode D8, the resistor R17 and the gate of the field effect transistor Q1 respectively, the anode of the light emitting diode D8 is connected with the resistor R16, the other end of the resistor R16 and the resistor R17 is connected with the 5V power supply, the collector of the triode Q2, the resistor R13 and the source of the field effect transistor Q1 are connected with the GND ground terminal, the drain of the field effect transistor Q1 is connected with the cathode of the light emitting diode D7, the anode of the diode D6 and the second coil end of the relay K1 respectively, the anode of the light emitting diode D7 is connected with the resistor R20, the other end of the resistor R20, the cathode of the diode D6 and the first coil end of the relay K1 are connected with the 24V power supply, the first and second common ends of the relay K1 are connected, the first and second normally open contacts of the relay K1 control the output SHUTDOWNCIRCUIT IN, and the SHUTDOWNCIRCUIT IN is output through the connector CN1;

[0042] The safety loop circuit based on the battery management system signal control includes:

[0043] The resistor R14, one end of the resistor R14 is connected with the BMS LED1 signal, the other end of the resistor R14 is connected with the base of the triode Q4 and the resistor R15 respectively, the emitter of the triode Q4 is connected with the cathode of the light emitting diode D11, the resistor R19 and the gate of the field effect transistor Q3 respectively, the anode of the light emitting diode D11 is connected with the resistor R18, the other end of the resistor R18 and the resistor R19 is connected with the 5V power supply, the collector of the triode Q4, the resistor R15 and the source of the field effect transistor Q3 are connected with the GND ground terminal, the drain of the field effect transistor Q3 is connected with the cathode of the light emitting diode D10, the anode of the diode D9 and the second coil end of the relay K2 respectively, the anode of the light emitting diode D10 is connected with the resistor R21, the other end of the resistor R21, the cathode of the diode D9 and the first coil end of the relay K2 are connected with the 24V power supply, the first and second common ends of the relay K1 are connected, and the first and second common ends of the relay K1 are connected, the first and second normally open contacts of the relay K1 control the output SHUTDOWNCIRCUITMIDDLE signal;

[0044] The control circuit includes:

[0045] Relay K3, the first and second normally open contacts of relay K3 are connected with the activation signal input from the extravehicular activation A end, the first and second common ends of relay K3 are connected and receive the SHUTDOWNCIRCUIT MIDDLE signal, the first and second normally closed contacts of relay K3 are connected with the activation signal input from the intravehicular activation E end, the first coil end of relay K3 is connected with the ASMS1 signal, the cathode of diode D15 and the resistance R31 respectively, the other end of resistance R31 is connected with the anode of light emitting diode D16, the second coil end of relay K3, the anode of diode D15 and the cathode of light emitting diode D16 are all connected with the GND ground end;

[0046] The ASMS1 signal circuit comprises:

[0047] Diode D19, the anode of diode D19 is connected with the ASMS signal input from the ASMS signal end, the cathode of diode D19 is connected with the fuse F2, the other end of fuse F2 is connected with the inductor L2, the other end of inductor L2 is connected with the positive pole of capacitor C11, the negative pole of capacitor C11 is connected with the GND ground end, and the ASMS1 signal is output;

[0048] Relay K4, the first and second normally open contacts of relay K4 control the output SHUTDOWNCIRCUIT OUT signal and are output through the connector CN4, the first and second common ends of relay K4 are connected and receive the SHUTDOWNCIRCUIT MIDDLE signal, the first coil end of relay K4 is connected with the high voltage signal input from the 24V 2 power supply end, the cathode of diode D17 and the resistance R32 respectively, the other end of resistance R32 is connected with the anode of light emitting diode D18, the second coil end of relay K4, the anode of diode D17 and the cathode of light emitting diode D18 are all connected with the GND ground end.

[0049] Compared with the prior art, the utility model has the advantages that:

[0050] The utility model discloses a hardware circuit to realize fault detection, signal processing and safety loop control, and does not need to rely on a microcontroller, so as to solve the problems in the prior art. BRIEF DESCRIPTION OF DRAWINGS

[0051] Figure 1 It is signal input circuit diagram for the utility model;

[0052] Figure 2 It is power supply circuit diagram for the utility model;

[0053] Figure 3 It is signal detection circuit diagram for the utility model;

[0054] Figure 4 It is delay circuit diagram for the utility model;

[0055] Figure 5 It is the light coupling isolation circuit diagram of the utility model;

[0056] Figure 6 It is the trigger circuit diagram of the utility model;

[0057] Figure 7 It is the relay control safety loop circuit diagram of the utility model;

[0058] Figure 8 It is the relay control circuit diagram of the utility model. DETAILED DESCRIPTION

[0059] The technical solutions in the embodiments of the utility model will be clearly and completely described below with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the utility model.

[0060] The utility model provides the following technical scheme: a safety loop control and fault processing system based on hardware, comprising: a signal input circuit, a power supply circuit, a signal detection circuit, a delay circuit, a light coupling isolation circuit and a relay control safety loop circuit, wherein:

[0061] The signal input circuit inputs power supply signals, IMD SIG signals, BMS SIG signals, IMD RESET signals, BMS RESET signals and ASMS signals.

[0062] The power supply circuit converts required voltages to supply power.

[0063] The signal detection circuit detects whether the IMD SIG signals and the BMS SIG signals have faults.

[0064] The delay circuit buffers and avoids misoperation caused by signal fluctuation.

[0065] The light coupling isolation circuit electrically isolates high-voltage and low-voltage parts to ensure system safety.

[0066] The relay control safety loop circuit disconnects the control loop by a relay when detecting a fault until a manual reset signal triggers recovery.

[0067] As shown in the accompanying Figure 1 The signal input circuit specifically comprises:

[0068] The 1-10 pins of the connector J1 are connected with the 24V 1 power supply end, the GND ground end, the IMD SIG signal end, the IMD RESET signal end, the BMS SIG signal end, the BMS RESET signal end, the IMD LED1 signal end, the BMS LED1 signal end, the 24V 2 power supply end and the ASMS signal end respectively;

[0069] The 1-2 pins of the connector CN2 are connected with the extravehicular activation signal end, i.e. the A end;

[0070] The 1-2 pins of the connector CN3 are connected with the intravehicular activation signal end, i.e. the E end.

[0071] As shown in the accompanying Figure 2 , specifically, the power supply circuit includes a 24V power supply circuit, a 12V power supply circuit and a 5V power supply circuit, wherein:

[0072] The 24V power supply circuit includes:

[0073] A diode D1, the anode of the diode D1 is connected with the 24V power supply input from the 24V 1 power supply end, the cathode of the diode D1 is connected with a fuse F1, the other end of the fuse F1 is connected with an inductor L1, the other end of the inductor L1 is connected with a capacitor C1 anode, the cathode of the capacitor C1 is connected with the GND ground end, and the 24V power supply is output;

[0074] The 12V power supply circuit includes:

[0075] A resistor R25, one end of the resistor R25 is connected with the output 24V power supply, the other end of the resistor R25 is connected with a resistor R28, the other end of the resistor R28 is connected with the GND ground end, and the 12V power supply is output;

[0076] The 5V power supply circuit includes:

[0077] A three-terminal linear voltage regulator U1, the input end of the three-terminal linear voltage regulator U1 is connected with the 24V power supply, capacitors C2 and C4 respectively, the output end of the three-terminal linear voltage regulator U1 is connected with the capacitor C3 anode, capacitors C5 and a resistor R1 respectively, the other end of the resistor R1 is connected with the anode of a light-emitting diode D12, the cathode of the capacitor C2, the other end of the capacitor C4, the GND ground end of the three-terminal linear voltage regulator U1, the cathode of the capacitor C3, the other end of the capacitor C5 and the cathode of the light-emitting diode D12 are connected with the CND ground end, and the 5V power supply is output.

[0078] As shown in the accompanying Figure 3 , specifically, the signal detection circuit includes:

[0079] The power comparator U6, the first and second input terminals of the power comparator U6 are connected with the IMD SIG signal and the BMS SIG signal input from the IMD SIG signal terminal and the BMS SIG signal terminal respectively, the VCC terminal of the power comparator U6 is connected with the 24V power supply, the first and second negative input terminals are connected with the BENCHMARK signal terminal adjusted to 11.3V and the BMSCHECK signal terminal adjusted to 1.5V respectively, the first and second output terminals are connected with the cathodes of the light emitting diodes D13 and D14 respectively, the anodes of the light emitting diodes D13 and D14 are connected with the resistors R22 and R24 respectively, the other ends of the resistors R22 and R24 are connected with the 5V power supply respectively, the GND ground terminals are connected with the GND ground terminal, and the output signal detection result is output from the first and second output terminals;

[0080] The voltage adjusting circuit of the BENCHMARK signal terminal comprises:

[0081] The adjustable resistor R27 has three terminals connected with the BENCHMARK signal terminal, the resistor R26 and the GND ground terminal respectively, and the other end of the resistor R26 is connected with the 24V power supply;

[0082] The voltage adjusting circuit of the BMSCHECK signal terminal comprises:

[0083] The adjustable resistor R29 has three terminals connected with the BMSCHECK signal terminal, the 5V power supply and the GND ground terminal respectively;

[0084] The comparison signal BENCHIMARK is set to 11.3V, the normal state output voltage of the IMD SIG signal is 24V, and the abnormal state output voltage is 12V or below, when the IMD SIG signal is in error, that is, the signal is 12V or below, a low level is output, and the error light D13 is bright;

[0085] The comparison signal BMSCHECK is set to 1.5V, the normal state output voltage of the BMS SIG signal is 12V, and the abnormal state output voltage is 0V, when the BMS SIG signal is in error, that is, the signal is 0V, a low level is output, and the error light D14 is bright.

[0086] As shown in the accompanying drawings, Figure 4 Specifically, the delay circuit comprises an IMD SIG signal delay circuit and a BMS SIG signal delay circuit, wherein:

[0087] The IMD SIG signal delay circuit comprises:

[0088] The resistors R2 and R30 have one end connected with the detected IMD SIG signal, the other end of the resistor R2 is connected with the capacitor C6, and the other ends of the capacitor C6 and the resistor R30 are connected with the GND ground terminal,

[0089] output the IMD SIG1 signal;

[0090] The BMS SIG signal delay circuit comprises:

[0091] resistors R3 and R23, one end of the resistors R3 and R23 being connected to the detected BMS SIG signal, the other end of the resistor R3 being connected to the capacitor C7, the other end of the capacitor C7 and the resistor R23 being connected to the GND ground terminal,

[0092] output the BMS SIG1 signal;

[0093] IMD SIG signal delay: in the normal state, the IMD SIG signal output voltage is 24V, the capacitor C6 starts to charge, and finally the IMD SIG1 signal output voltage is 24V; in the abnormal state, the IMD SIG signal output voltage is less than 12V, the capacitor C6 discharges, and finally the IMD SIG1 signal output voltage is less than 12V;

[0094] The BMS SIG1 signal delay is the same.

[0095] As shown in the accompanying Figure 5 , specifically, the optical coupling isolation circuit comprises:

[0096] optocoupler U2, the anodes of the four light emitting diodes of the optocoupler U2 being respectively connected to resistors R4, R5, R6 and R7, the other ends of the resistors R4, R5, R6 and R7 being respectively connected to the cathodes of diodes D2, D3, D4 and D5, the anode of the diode D2 being connected to a 12V power supply, the anodes of the diodes D3 and D5 being connected to a 5V power supply, the anode of the diode D4 being connected to a 24V power supply, the cathodes of the four light emitting diodes being respectively connected to the BMS SIG1 signal, the BMS RESET signal input from the BMS SIG signal end, the IMD SIG1 signal and the IMD RESET signal input from the IMD RESET signal end, the emitters of the four optoelectronic receiving transistors being respectively connected to resistors R8, R9, R10 and R11, the other ends of the resistors R8, R9, R10 and R11 being connected to a 5V power supply, the collectors of the two optoelectronic receiving transistors connected to the BMS RESET signal and the IMD RESET signal being respectively connected to capacitors C8 and C9, the other ends of the capacitors C8 and C9 being respectively connected to resistors R9 and R11, the collectors of the four optoelectronic receiving transistors being connected to the GND ground terminal, and the BMS SIG2 signal, the BMS RESET1 signal, the IMD SIG2 signal and the IMD RESET1 signal being respectively output;

[0097] When the IMD SIG1 signal is normally 24V, there is no voltage difference across the light emitting diodes in the optocoupler, the right side is not conductive, and the IMD SIG2 signal is 1.

[0098] When the IMD SIG1 signal error is reported as 12V, the light coupling internal diode emits light, the right side is turned on, and the IMD SIG2 signal is 0;

[0099] When the reset button is pressed, the IMD RESET signal has a momentary ground, and when the ground is lighted, the left side of the light coupling emits light, the right side is turned on, and the IMD RESET1 signal is 0;

[0100] The BMS SIG1, BMS SIG2, BMS RESET and BMS RESET1 signals are the same.

[0101] Specifically, the relay control safety loop circuit includes a trigger circuit, an insulation monitoring device signal based safety loop circuit control circuit, a battery management system signal based safety loop circuit control circuit and a control circuit, wherein:

[0102] As shown in the accompanying Figure 6 The trigger circuit includes:

[0103] The RS trigger U3, the first and second low level effective reset ends of the RS trigger U3 are connected with the IMD SIG2 signal and the BMS SIG2 signal respectively, the first and second low level effective set ends of the RS trigger U3 are connected with the IMD RESET1 signal and the BMS RESET1 signal respectively, the VCC end of the RS trigger U3 is connected with the 24V power supply and the capacitor C10, the other end of the capacitor C10 is connected with the GND ground end, the first and second input ends, the first and second immediate clock pulse signal ends and the GND ground end of the RS trigger U3 are connected with the GND ground end, and the first and second low level effective output ends of the RS trigger U3 output the IMD LED1 signal and the BMS LED1 signal respectively;

[0104] When an error is reported, R0, S1 and Q are not 1, that is, the LED signal is 1;

[0105] When the delay ends, R1, S1 and Q are not 1, and the previous state is maintained;

[0106] When reset, R1, S0 and Q are not 0 and R1, S1 and Q are not 0, and the normal state is restored, that is, the LED signal;

[0107] As shown in the accompanying Figure 7 The insulation monitoring device signal based safety loop circuit control circuit includes:

[0108] The resistor R12, one end of the resistor R12 is connected with the IMD LED1 signal, the other end of the resistor R12 is connected with the base of the triode Q2 and the resistor R13 respectively, the emitter of the triode Q2 is connected with the cathode of the light emitting diode D8, the resistor R17 and the gate of the field effect transistor Q1 respectively, the anode of the light emitting diode D8 is connected with the resistor R16, the other end of the resistor R16 and the resistor R17 is connected with the 5V power supply, the collector of the triode Q2, the resistor R13 and the source of the field effect transistor Q1 are connected with the GND ground terminal, the drain of the field effect transistor Q1 is connected with the cathode of the light emitting diode D7, the anode of the diode D6 and the second coil end of the relay K1 respectively, the anode of the light emitting diode D7 is connected with the resistor R20, the other end of the resistor R20, the cathode of the diode D6 and the first coil end of the relay K1 are connected with the 24V power supply, the first and second common ends of the relay K1 are connected, the first and second normally open contacts of the relay K1 control the output SHUTDOWNCIRCUIT IN, and the SHUTDOWNCIRCUIT IN is output through the connector CN1;

[0109] The safety loop circuit controlled based on the battery management system signal comprises:

[0110] The resistor R14, one end of the resistor R14 is connected with the BMS LED1 signal, the other end of the resistor R14 is connected with the base of the triode Q4 and the resistor R15 respectively, the emitter of the triode Q4 is connected with the cathode of the light emitting diode D11, the resistor R19 and the gate of the field effect transistor Q3 respectively, the anode of the light emitting diode D11 is connected with the resistor R18, the other end of the resistor R18 and the resistor R19 is connected with the 5V power supply, the collector of the triode Q4, the resistor R15 and the source of the field effect transistor Q3 are connected with the GND ground terminal, the drain of the field effect transistor Q3 is connected with the cathode of the light emitting diode D10, the anode of the diode D9 and the second coil end of the relay K2 respectively, the anode of the light emitting diode D10 is connected with the resistor R21, the other end of the resistor R21, the cathode of the diode D9 and the first coil end of the relay K2 are connected with the 24V power supply, the first and second common ends of the relay K1 are connected, and the first and second common ends of the relay K1 are connected, the first and second normally open contacts of the relay K1 control the output SHUTDOWNCIRCUITMIDDLE signal;

[0111] Normal state: LED1 = 0, Q2 and Q4 are not turned on, D8 and D11 are not bright, Q1 and Q3 are turned on, D7 and D10 emit light, K1 and K2 are both turned on, and the safety loop is turned on;

[0112] Abnormal state: LED1 = 1, Q2 and Q4 are turned on, D8 and D11 emit light, Q1 and Q3 are not turned on, D7 and D10 are not bright, K1 and K2 are not turned on, and the safety loop is turned off;

[0113] As shown in the accompanying drawings, Figure 8 The control circuit comprises:

[0114] A relay K3, the first and second normally open contacts of the relay K3 are connected with the activation signal input from the extravehicular activation A end, the first and second common terminals of the relay K3 are connected and receive the SHUTDOWN CIRCUIT MIDDLE signal, the first and second normally closed contacts of the relay K3 are connected with the activation signal input from the intravehicular activation E end, the first coil terminal of the relay K3 is connected with the ASMS1 signal, the cathode of a diode D15 and a resistor R31 respectively, the other end of the resistor R31 is connected with the anode of a light emitting diode D16, the second coil terminal of the relay K3, the anode of the diode D15 and the cathode of the light emitting diode D16 are all connected with the GND ground terminal;

[0115] The ASMS1 signal circuit comprises:

[0116] A diode D19, the anode of the diode D19 is connected with the ASMS signal input from the ASMS signal end, the cathode of the diode D19 is connected with a fuse F2, the other end of the fuse F2 is connected with an inductor L2, the other end of the inductor L2 is connected with the positive electrode of a capacitor C11, the negative electrode of the capacitor C11 is connected with the GND ground terminal, and the ASMS1 signal is output;

[0117] A relay K4, the first and second normally open contacts of the relay K4 control the output of the SHUTDOWN CIRCUIT OUT signal, which is output through the connector CN4, the first and second common terminals of the relay K4 are connected and receive the SHUTDOWN CIRCUIT MIDDLE signal, the first coil terminal of the relay K4 is connected with the high voltage signal input from the 24V 2 power supply end, the cathode of a diode D17 and a resistor R32 respectively, the other end of the resistor R32 is connected with the anode of a light emitting diode D18, the second coil terminal of the relay K4, the anode of the diode D17 and the cathode of the light emitting diode D18 are all connected with the GND ground terminal;

[0118] The A end is the extravehicular activation end, and the E end is the intravehicular activation end, when the ASMS is opened, the K3 is turned on, and the MIDDLE is switched from the E to the A, that is, switched from the intravehicular activation to the extravehicular activation.

[0119] Although the embodiments of the present application have been shown and described, it should be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A hardware-based safety loop control and fault handling system, characterized in that, include: The circuit includes a signal input circuit, a power supply circuit, a signal detection circuit, a delay circuit, an optocoupler isolation circuit, and a relay control safety circuit, among which: The signal input circuit accepts power signals, IMD SIG signals, BMS SIG signals, IMD RESET signals, BMS RESET signals, and ASMS signals. The power supply circuit converts the required voltage to provide power. The signal detection circuit detects whether the IMD SIG signal and the BMS SIG signal are faulty; Delay circuitry and buffering are used to prevent malfunctions caused by signal fluctuations. Optical isolation circuits electrically isolate high-voltage and low-voltage components to ensure system safety; The relay-controlled safety circuit disconnects the control circuit when a fault is detected, and the circuit is restored only when triggered by a manual reset signal.

2. The hardware-based safety loop control and fault handling system according to claim 1, characterized in that: The signal input circuit includes: Pins 1 to 10 of connector J1 are connected to the 24V 1 power supply terminal, GND ground terminal, IMD SIG signal terminal, IMD RESET signal terminal, BMS SIG signal terminal, BMS RESET signal terminal, IMD LED1 signal terminal, BMS LED1 signal terminal, 24V 2 power supply terminal, and ASMS signal terminal, respectively. Pins 1-2 of connector CN2 are connected to the external activation signal terminal, i.e., terminal A. Pins 1-2 of connector CN3 are connected to the activation signal terminal inside the cabin, i.e., the E terminal.

3. The hardware-based safety loop control and fault handling system according to claim 2, characterized in that: The power supply circuit includes a 24V power supply circuit, a 12V power supply circuit, and a 5V power supply circuit, wherein: The 24V power supply circuit includes: Diode D1, the positive terminal of diode D1 is connected to the 24V power input at the 24V 1 power supply terminal, the negative terminal of diode D1 is connected to fuse F1, the other end of fuse F1 is connected to inductor L1, the other end of inductor L1 is connected to the positive terminal of capacitor C1, the negative terminal of capacitor C1 is connected to the GND ground terminal, and the output is 24V power. The 12V power supply circuit includes: Resistor R25, one end of resistor R25 is connected to the 24V output power supply, the other end of resistor R25 is connected to resistor R28, the other end of resistor R28 is connected to the GND ground terminal, and the output power supply is 12V. The 5V power supply circuit includes: The three-terminal linear regulator U1 has its input terminals connected to a 24V power supply, capacitors C2 and C4, and its output terminals connected to the positive terminal of capacitor C3, capacitor C5, and resistor R1. The other end of resistor R1 is connected to the positive terminal of LED D12. The negative terminal of capacitor C2, the other end of C4, the GND ground terminal of the three-terminal linear regulator U1, the negative terminal of capacitor C3, the other end of C5, and the negative terminal of LED D12 are connected to the CND ground terminal to output a 5V power supply.

4. The hardware-based safety loop control and fault handling system according to claim 3, characterized in that: The signal detection circuit includes: Power comparator U6 has its first and second input terminals connected to the IMD SIG and BMS SIG signals respectively. Its VCC terminal is connected to a 24V power supply. Its first and second negative input terminals are connected to the BENCHMARK signal (adjusted to 11.3V) and the BMSCHECK signal (adjusted to 1.5V) respectively. Its first and second output terminals are connected to the cathodes of LEDs D13 and D14 respectively. The anodes of LEDs D13 and D14 are connected to resistors R22 and R24 respectively. The other ends of resistors R22 and R24 are connected to a 5V power supply. The GND ground terminal is connected to the GND ground terminal. The output signal detects the result. The voltage regulation circuit at the BENCHMARK signal terminal includes: The adjustable resistor R27 has three terminals connected to the BENCHMARK signal terminal, resistor R26, and GND ground terminal, respectively. The other terminal of resistor R26 is connected to the 24V power supply. The voltage regulation circuit at the BMSCHECK signal terminal includes: The adjustable resistor R29 is connected to the BMSCHECK signal terminal, the 5V power supply, and the GND ground terminal, respectively.

5. The hardware-based safety loop control and fault handling system according to claim 4, characterized in that: The delay circuit includes an IMD SIG signal delay circuit and a BMS SIG signal delay circuit, wherein: The IMD SIG signal delay circuit includes: Resistors R2 and R30 are connected at one end to the detected IMD SIG signal, and the other end of resistor R2 is connected to capacitor C6. Capacitor C6 and the other end of resistor R30 are connected to the GND ground terminal to output the IMD SIG1 signal. The BMS SIG signal delay circuit includes: Resistors R3 and R23 are connected at one end to the detected BMS SIG signal, and the other end of resistor R3 is connected to capacitor C7. The other end of capacitor C7 and resistor R23 are connected to the GND ground terminal, and the BMS SIG1 signal is output.

6. The hardware-based safety loop control and fault handling system according to claim 5, characterized in that: The optocoupler isolation circuit includes: Optocoupler U2 has four LEDs whose anodes are connected to resistors R4, R5, R6, and R7, respectively. The other ends of resistors R4, R5, R6, and R7 are connected to the cathodes of diodes D2, D3, D4, and D5, respectively. The anode of diode D2 is connected to a 12V power supply, the anodes of diodes D3 and D5 are connected to a 5V power supply, and the anode of diode D4 is connected to a 24V power supply. The cathodes of the four LEDs are connected to the BMS SIG1 signal, the BMS RESET signal input from the BMS SIG signal terminal, the IMD SIG1 signal, and the IMD RESET signal input from the IMD RESET signal terminal, respectively. The emitters of the four phototransistors are connected to resistors R8, R9, R10, and R11, respectively. The other ends of resistors R8, R9, R10, and R11 are connected to a 5V power supply, and are connected to the cathodes of the BMS RESET signal and the IMD RESET signal. The collectors of the two phototransistors connected to the RESET signal are connected to capacitors C8 and C9, respectively. The other ends of capacitors C8 and C9 are connected to resistors R9 and R11, respectively. The collectors of the four phototransistors are connected to the GND ground terminal, and output the BMS SIG2 signal, BMS RESET1 signal, IMD SIG2 signal, and IMD RESET1 signal, respectively.

7. The hardware-based safety loop control and fault handling system according to claim 6, characterized in that: The relay control safety circuit includes a trigger circuit, a safety circuit controlled by an insulation monitoring device signal, a safety circuit controlled by a battery management system signal, and a control circuit, wherein: The trigger circuit includes: RS flip-flop U3 has its first and second active low-level reset terminals connected to the IMD SIG2 and BMS SIG2 signals, respectively. Its first and second active low-level set terminals are connected to the IMD RESET1 and BMS RESET1 signals, respectively. The VCC terminal of RS flip-flop U3 is connected to a 24V power supply and capacitor C10. The other end of capacitor C10 is connected to the GND ground terminal. The first and second input terminals, the first and second clock pulse signal terminals, and the GND ground terminal of RS flip-flop U3 are connected to the GND ground terminal. The first and second active low-level output terminals of RS flip-flop U3 output the IMD LED1 and BMS LED1 signals, respectively. The safety circuit based on the signal control of the insulation monitoring device includes: Resistor R12 is connected at one end to the IMD LED1 signal, and at the other end to the base of transistor Q2 and resistor R13. The emitter of transistor Q2 is connected to the cathode of LED D8, resistor R17, and the gate of MOSFET Q1. The anode of LED D8 is connected to resistor R16. The other ends of resistors R16 and R17 are connected to a 5V power supply. The collector of transistor Q2, resistor R13, and the source of MOSFET Q1 are connected to ground (GND). The drain of MOSFET Q1 is connected to the cathode of LED D7, the anode of diode D6, and the second coil terminal of relay K1. The anode of LED D7 is connected to resistor R20. The other end of resistor R20, the cathode of diode D6, and the first coil terminal of relay K1 are connected to a 24V power supply. The first and second common terminals of relay K1 are connected. The first and second normally open contacts of relay K1 control the output SHUTDOWNCIRCUIT IN. IN is output via connector CN1; The battery management system-based signal control safety circuit includes: Resistor R14 is connected at one end to the BMS LED1 signal, and at the other end to the base of transistor Q4 and resistor R15. The emitter of transistor Q4 is connected to the cathode of LED D11, resistor R19, and the gate of MOSFET Q3. The anode of LED D11 is connected to resistor R18. The other ends of resistors R18 and R19 are connected to a 5V power supply. The collector of transistor Q4, resistor R15, and the source of MOSFET Q3 are connected to GND. The drain of MOSFET Q3 is connected to the cathode of LED D10, the anode of diode D9, and the second coil terminal of relay K2. The anode of LED D10 is connected to resistor R21. The other end of resistor R21, the cathode of diode D9, and the first coil terminal of relay K2 are connected to a 24V power supply. The first and second common terminals of relay K1 are connected, and the first and second normally open contacts of relay K1 control the output SHUTDOWNCIRCUIT. MIDDLE signal; The control circuit includes: Relay K3 has its first and second normally open contacts connected to the activation signal input at the external activation A terminal. The first and second common terminals of relay K3 are connected to receive the SHUTDOWNCIRCUIT MIDDLE signal. The first and second normally closed contacts of relay K3 are connected to the activation signal input at the internal activation E terminal. The first coil terminal of relay K3 is connected to the ASMS1 signal, the cathode of diode D15, and resistor R31, respectively. The other end of resistor R31 is connected to the anode of LED D16. The second coil terminal of relay K3, the anode of diode D15, and the cathode of LED D16 are all connected to the GND ground terminal. The ASMS1 signal circuit includes: Diode D19: The positive terminal of diode D19 is connected to the ASMS signal input at the ASMS signal terminal. The negative terminal of diode D19 is connected to fuse F2. The other end of fuse F2 is connected to inductor L2. The other end of inductor L2 is connected to the positive terminal of capacitor C11. The negative terminal of capacitor C11 is connected to the GND ground terminal, and the ASMS1 signal is output. Relay K4's first and second normally open contacts control the output of the SHUTDOWNCIRCUIT OUT signal, which is output through connector CN4. The first and second common terminals of relay K4 are connected to receive the SHUTDOWNCIRCUIT MIDDLE signal. The first coil terminal of relay K4 is connected to the high-voltage signal input from the 24V 2 power supply terminal, the cathode of diode D17, and resistor R32, respectively. The other end of resistor R32 is connected to the anode of LED D18. The second coil terminal of relay K4, the anode of diode D17, and the cathode of LED D18 are all connected to the GND ground terminal.

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