CN114884043B - On-load voltage release control circuit for lifting system of airborne suspension device - Google Patents

Abstract

The invention provides a forward voltage release control circuit for an airborne suspension device lifting system, which comprises the following components: the device comprises a first voltage detection circuit, a second voltage detection circuit, a voltage bleeder circuit and a logic processing module; the first voltage detection circuit is connected with a power supply of the suspension system and is used for detecting whether the bus voltage of the power supply exceeds a set threshold value and sending a detection result to the logic processing module; the second voltage detection circuit is connected with a power supply provided with a suspension system and is used for reducing the bus voltage of the power supply proportionally and sending the bus voltage to the logic processing module; the logic processing module is used for generating PWM signals according to the reduced voltage signals sent by the second voltage detection circuit and outputting the PWM signals to the voltage bleeder circuit when the detection results of the first voltage detection circuit and the second voltage detection circuit both indicate that the bus voltage exceeds a set threshold value; and the voltage bleeder circuit is used for receiving the PWM signal from the logic processing module and realizing the bleeder control of the forward voltage.

Description

A parallel load voltage discharge control circuit for the hoisting system of the airborne suspension device

technical field

The invention belongs to the technical field of on-load voltage discharge control of an equipment suspension system, and in particular relates to an on-load voltage discharge control circuit used for a lifting system of an airborne suspension device.

Background technique

At present, most aircraft use external pylons. When installing the aircraft, the aircraft is usually installed on the pylons by the ground crew "hands-on-shoulder" or by using a ground lift vehicle. Since the pylons are outside the aircraft, the visibility is better. , The installation is more convenient, but the ground lifting equipment is added, which puts forward higher requirements for aircraft support. For example, for carrier-based aircraft, adding multiple ground loading vehicles on the aircraft carrier will occupy more space on the aircraft carrier and affect combat effectiveness. At the same time, in wartime, if a military plane lands at a civilian airport, the civilian airport cannot prepare the ground loading vehicle in time, which will greatly prolong the preparation time of the aircraft, thereby affecting the combat effectiveness of the aircraft.

As the aircraft control system is developing in the direction of multi-electricity and all-electricity, it has become an inevitable trend for the aircraft equipment suspension system to change to the direction of automatic control. The following problems are safety issues, and the biggest hidden danger is the impact of the parallel load voltage on the control system. The impact of the impact has brought difficulties to the reliability and stability of the aircraft equipment suspension system.

Contents of the invention

The invention provides a parallel-load voltage discharge control circuit for the lifting system of an airborne suspension device, which can realize the detection of the parallel-load voltage and suppress it, so that the bus voltage of the system can be kept stable, and the impact of the parallel-load voltage on the control system can be solved. question.

The present invention provides an onboard voltage discharge control circuit for the lifting system of an airborne suspension device, including: a first voltage detection circuit, a second voltage detection circuit, a voltage discharge circuit and a logic processing module; wherein,

The first voltage detection circuit is connected to the power supply equipped with the suspension system, and is used to detect whether the bus voltage of the power supply exceeds a set threshold, and send the detection result to the logic processing module;

The second voltage detection circuit is connected to the power supply equipped with the suspension system, and is used to scale down the bus voltage of the power supply and send it to the logic processing module;

The logic processing module is configured to generate a PWM signal according to the reduced voltage signal sent by the second voltage detection circuit when the detection results of the first voltage detection circuit and the second voltage detection circuit both indicate that the bus voltage exceeds the set threshold, output to the voltage relief circuit;

The voltage discharge circuit is used to receive the PWM signal from the logic processing module to realize the discharge control of the load voltage.

Optionally, the logic processing module is further configured to turn off the output PWM signal when the detection results of the first voltage detection circuit and the second voltage detection circuit both indicate that the bus voltage does not exceed the set threshold.

Optionally, the logic processing module is also used to:

When the detection result of the first voltage detection circuit indicates that the bus voltage does not exceed the set threshold, and the detection result of the second voltage detection circuit indicates that the bus voltage exceeds the set threshold, the output PWM signal is turned off, and a circuit failure is prompted.

Optionally, the logic processing module is also used to:

When the detection result of the second voltage detection circuit indicates that the bus voltage does not exceed the set threshold, and the detection result of the first voltage detection circuit indicates that the bus voltage exceeds the set threshold, the output PWM signal is turned off and a circuit fault is prompted.

Optionally, the first voltage detection circuit includes: resistor R1a, resistor R2a, resistor R3a, resistor R4a, resistor R5a, resistor R6a, resistor R7a, resistor R8a, resistor R9a, resistor R10a, resistor R11a, capacitor C1a, capacitor C2a, comparator U1a and optocoupler U2a; where,

The first end of the resistance R1a and the resistance R2a is connected to the power supply of the equipment suspension system, the second end of the resistance R1a and the resistance R2a is connected to the first end of the resistance R3a and the resistance R4a, and the second end of the resistance R3a and the resistance R4a is connected to the resistance R7a, resistor R8a, and the first end of capacitor C1a are connected;

The second end of the resistor R8a is connected to the first end of the resistor R9a, and the second end of the resistor R9a and the capacitor C1a are grounded;

The non-inverting input terminal of the comparator U1a is connected to the second terminal of the resistor R7a, the inverting input terminal of the comparator U1a is connected to the first terminal of the resistor R10a and the resistor R11a, and the second terminal of the resistor R10a is connected to the first DC power supply VCC, The second terminal of the resistor R11a is grounded, the output terminal of the comparator U1a is connected to the first terminal of the resistor R5a and the capacitor C2a, the second terminal of the resistor R5a is connected to the first DC power supply VCC; the second terminal of the capacitor C2a is grounded;

The positive input of the optocoupler U2a is connected to the first end of the resistor R5a, the negative input of the optocoupler U2a is grounded, the positive output of the optocoupler U2a is connected to the logic processing module and the first end of the resistor R6a, and the second end of the resistor R6a is connected to the first end of the resistor R6a. The two DC power sources are connected to VDD, and the negative output of the optocoupler U2a is grounded.

Optionally, the second voltage detection circuit includes: resistor R1b, resistor R2b, resistor R3b, resistor R4b, resistor R5b, resistor R6b, resistor R7b, resistor R8b, resistor R9b, resistor R10b, capacitor C1b, capacitor C2b, current Sensor U1b, operational amplifier U2b, operational amplifier U3b and diode Q1b; where,

The first end of the resistor R1b and the resistor R2b is connected to the power supply of the equipment suspension system, the second end of the resistor R1b and the resistor R2b is connected to the first end of the resistor R4b and the resistor R5b, and the second end of the resistor R4b and the resistor R5b is input to the current sensor U1b Positive connection, the input of the current sensor U1b is negatively grounded, the output terminal of the current sensor U1b is connected to the first end of the resistor R8 and the resistor R9b, and the second end of the resistor R8b is grounded;

The non-inverting input terminal of the operational amplifier U2b is connected to the second terminal of the resistor R9b and the first terminal of the resistor R10b, the second terminal of the resistor R10b is grounded, the inverting input terminal of the operational amplifier U2b is connected to the first terminal of the resistor R3b, the resistor R6b, and the capacitor C1b connected, the second end of the resistor R6b is grounded, and the output end of the operational amplifier U2b is connected to the second end of the resistor R3b and the capacitor C1b;

The noninverting input terminal of the operational amplifier U3b is connected to the output terminal of the operational amplifier U2b, the inverting input terminal of the operational amplifier U3b is connected to the output terminal of the operational amplifier U3b, and the output terminal of the operational amplifier U3b is connected to the first end of the resistor R7b;

The output end of the diode Q1b is connected to the second end of the resistor R7b, the first end of the capacitor C2b, and the logic processing module, the second end of the capacitor C2b is grounded, the positive stage of the diode Q1b is connected to the second DC power supply VDD, and the negative stage of the diode Q1b is grounded.

Optionally, the voltage discharge circuit includes: resistor R1c, resistor R2c, resistor R3c, resistor R4c, resistor R5c, resistor R6c, resistor R7c, resistor R8c, resistor R9c, resistor R10c, resistor R11c, resistor R12c, resistor R13c , resistor R14c, resistor R15c, capacitor C1c, capacitor C2c, capacitor C3c, capacitor C4c, capacitor C5c, capacitor C6c, capacitor C7c, capacitor C8c, capacitor C9c, diode D1c, diode D2c, diode D3c, IGBT Q4c , transistor Q1c, transistor Q2c, transistor Q3c, isolation driver U1c; where,

The receiving pin of the isolated driver U1c is connected to the PWM output terminal of the logic processing module;

The first end of the isolation driver U1c is connected to DGND and the first end of the capacitor C1c;

The second terminal of the isolation driver U1c is connected to the second DC power supply VDD, the second terminal of the capacitor C1c, and the first terminal of the resistor R4c;

The third terminal of the isolation driver U1c is connected to the second terminal of the resistor R4c and the first terminal of the capacitor C6c;

The fourth terminal of the isolation driver U1c is connected to DGND and the second terminal of the capacitor C6c, the sixth terminal and the seventh terminal of the isolation driver U1c, the first terminal of the resistor R8c, the first terminal of the resistor R13c, and the first terminal of the capacitor C9c are connected;

The fifth terminal and the eighth terminal of the isolation driver U1c, the second terminal of the resistor R13c, the second terminal of the capacitor C9c, and DGND are connected;

The ninth terminal, the twelfth terminal, the sixteenth terminal of the isolation driver U1c, the first terminal of the capacitor C5c, the first terminal of the capacitor C7c, the first terminal of the capacitor C8c, the collector of the transistor Q2c, the collector of the transistor Q3c, and the first resistor R12c terminal connection;

The tenth terminal of the isolation driver U1c is connected to the first terminal of the resistor R14c and the base of the transistor Q3c;

The eleventh terminal of the isolation driver U1c is connected to the first terminal of the resistor R6c and the first terminal of the resistor R10c;

The thirteenth terminal of the isolation driver U1c is connected to the second terminal of the capacitor C5c, the first terminal of the capacitor C2c, the second terminal of the capacitor C7c, the second terminal of the capacitor C8c, the collector of the transistor Q1c, the negative pole of the diode D2c, and the first DC power supply VCC;

The fourteenth end of the isolation driver U1c is connected to the first end of the resistor R1c;

Isolate the sixteenth terminal of the driver U1c from the second terminal of the capacitor C2c, the first terminal of the capacitor C3c, the first terminal of the resistor R5c, the first terminal of the resistor R11c, the first terminal of the resistor R15c, the first terminal of the capacitor C4c, and the positive stage of the diode D3c;

The second end of the capacitor C3c is connected to the second end of the resistor R6c;

The second end of the resistor R1c is connected to the first end of the resistor R2c, the second end of the resistor R2c is connected to the first end of the resistor R3c, the second end of the resistor R3c is connected to the positive stage of the diode D1c, and the negative stage of the diode D1c is connected to the power supply of the suspension system POWER connection;

The base of the transistor Q1c is connected to the second end of the resistor R10c and the base of the transistor Q2c, the emitter of the transistor Q1c is connected to the emitter of the transistor Q2c, the first end of the resistor R7c, the first end of the resistor R9c, and the second end of the resistor R12c;

The emitter of the triode Q3c, the second end of the resistor R7c, the second end of the resistor R9c, the second end of the resistor R14c, the second end of the resistor R5, the second end of the resistor R11c, the second end of the capacitor C4c, the positive pole of the diode D2c, the negative pole of the diode D3c stage, the gate of the insulated gate bipolar transistor Q4c is connected;

The drain of the IGBT Q4c is connected to the power supply POWER equipped with the suspension system, and the source of the IGBT Q4c is connected to the second end of the resistor R15c.

Optionally, the logic processing module is also configured to receive a FAULT fault signal of the voltage discharge circuit.

The invention proposes a parallel-load voltage discharge control circuit for the lifting system of the airborne suspension device, which can realize the detection of the parallel-load voltage and suppress it, so that the bus voltage of the system can be kept stable, and the impact of the parallel-load voltage on the control system can be solved problems, improve system reliability and security, ensure the completion of combat missions and the safety of aircraft and personnel.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained according to these drawings without any creative effort.

Fig. 1 is the structural representation of the on-load voltage discharge control circuit used for the hoisting system of the airborne suspension device provided by the present invention;

2 is a schematic structural diagram of a first voltage detection circuit provided by the present invention;

3 is a schematic structural diagram of a second voltage detection circuit provided by the present invention;

Fig. 4 is a schematic diagram of the voltage discharge structure of the equipment suspension system provided by the present invention.

Detailed ways

The on-load voltage discharge control circuit used in the lifting system of the airborne suspension device provided by the present invention will be explained below in conjunction with the accompanying drawings.

As shown in Fig. 1, the on-load voltage discharge control circuit for the hoisting system of the airborne suspension device provided by the present invention includes: a first voltage detection circuit, a second voltage detection circuit, a voltage discharge circuit and a logic processing module.

Wherein, the first voltage detection circuit is connected to the power supply equipped with the suspension system, and is used to detect whether the bus voltage of the power supply exceeds a set threshold, and sends the detection result to the logic processing module;

The second voltage detection circuit is connected to the power supply equipped with the suspension system, and is used to scale down the bus voltage of the power supply and send it to the logic processing module;

The logic processing module is configured to generate a PWM signal according to the reduced voltage signal sent by the second voltage detection circuit when the detection results of the first voltage detection circuit and the second voltage detection circuit both indicate that the bus voltage exceeds the set threshold, output to the voltage relief circuit;

The voltage discharge circuit is used to receive the PWM signal from the logic processing module to realize the discharge control of the load voltage.

Exemplarily, the logic processing module implements the output of the PWM signal according to the feedback signal, including the following situations:

If the feedback signal of the first voltage detection circuit is low level and the feedback analog quantity of the second voltage detection circuit exceeds the set threshold, the logic processing module can output the PWM signal to the voltage discharge circuit, and the analog quantity is fed back through the second voltage detection circuit The size determines the duty cycle of the output PWM signal;

If the feedback signal of the first voltage detection circuit is high level and the feedback analog value of the second voltage detection circuit does not exceed the set threshold, the logic processing module closes the output PWM signal;

If the feedback signal of the first voltage detection circuit is high level and the feedback analog quantity of the second voltage detection circuit exceeds the set threshold, then the circuit is faulty, and the logic processing module closes the output PWM signal;

If the feedback signal of the first voltage detection circuit is low level and the feedback analog value of the second voltage detection circuit does not exceed the set threshold, then the circuit is faulty, and the logic processing module turns off the output PWM signal.

As shown in Figure 2, the first voltage detection circuit includes a resistor R1a, a resistor R2a, a resistor R3a, a resistor R4a, a resistor R5a, a resistor R6a, a resistor R7a, a resistor R8a, a resistor R9a, a resistor R10a, a resistor R11a, a capacitor C1a, Capacitor C2a, comparator U1a and optocoupler U2a;

Wherein, the first end of the resistor R1a and the resistor R2a is connected to the power supply POWER equipped with the suspension system, the second end of the resistor R1a is connected to the second end of the resistor R2a, and the second end of the resistor R1a and the resistor R2a is connected to the first end of the resistor R3a and the resistor R4a. The second end of the resistor R3a, the second end of the resistor R4a is connected with the first end of the resistor R7a, the resistor R8a, and the capacitor C1a.

The first end of the resistor R9a is connected to the second end of the resistor R8a, and the second end of the resistor R9a and the capacitor C1a are connected to the power supply PGND of the equipment suspension system (grounded);

The non-inverting input terminal of the comparator U1a is connected to the second terminal of the resistor R7a, the inverting input terminal of the comparator U1a is connected to the first terminal of the resistor R10a and the resistor R11a, the second terminal of the resistor R10a is connected to the first DC power supply VCC, and the resistor R11a The second terminal is connected to GND (ground), the positive terminal of the comparator U1a power supply is connected to VCC, the negative terminal of the comparator U1a power supply is connected to GND, the output terminal of the comparator U1a is connected to the first terminal of the resistor R5a and the capacitor C2a, and the second terminal of the resistor R5a Terminal is connected to VCC;

The positive input of the optocoupler U2a is connected to the first end of the resistor R5a, the negative input of the optocoupler U2a is connected to GND, the positive output of the optocoupler U2a (VOUT1) is connected to the first end of the resistor R6a and the logic processing module, and the first end of the resistor R6a is connected to GND. The two terminals are connected to the second DC power supply VDD, and the negative output of the optocoupler U2a is connected to AGND (grounded).

The resistor R1a, resistor R2a, resistor R3a, resistor R4a, resistor R5a, resistor R6a, resistor R8a, and resistor R9a of the first voltage detection circuit belong to precision sampling resistors, and their resistance value should be large so as not to affect the operation of the motor in the system Performance, used to divide the power supply POWER of the equipment suspension system and adjust it to a reasonable voltage range. After the sampling voltage is filtered by the resistor R7a and the capacitor C1a, it is sent to the non-inverting input terminal of the comparator U1a, and the comparison threshold of the inverting input terminal of the comparator U1a (also known as the set threshold) is obtained from the voltage division of the resistor R10a and the resistor R11a. If the POWER of the power supply equipped with the suspension system is higher than the set threshold, the output terminal of the comparator U1a will be a high voltage, that is, the front stage of the optocoupler U2a is turned on, and the output of the rear stage is low; if the power supply POWER of the equipped suspension system is lower than the set threshold If the threshold is set, the output terminal of comparator U1a will be low voltage, that is, the front stage of optocoupler U2a is cut off, and the output of the latter stage is high level. Through this circuit, the detection and early warning of the load voltage rise is realized, and the isolation of strong and weak electricity is realized through the optocoupler U2a, and the discrete value is sent to the logic processing module.

Exemplarily, the first DC power supply VCC may be a 15V DC power supply, and the second DC power supply VDD may be a 3.3V DC power supply.

As shown in Figure 3, the second voltage detection circuit includes resistor R1b, resistor R2b, resistor R3b, resistor R4b, resistor R5b, resistor R6b, resistor R7b, resistor R8b, resistor R9b, resistor R10b, capacitor C1b, capacitor C2b, Current sensor U1b, operational amplifier U2b, operational amplifier U3b and diode Q1b; where,

The first end of the resistor R1b and the resistor R2b is connected to the power supply POWER equipped with the suspension system, the second end of the resistor R1b is connected to the second end of the resistor R2b, and the second end of the resistor R1b and the resistor R2b is connected to the first end of the resistor R4b and the resistor R5b , the resistor R4b, the second terminal of the resistor R5b are positively connected to the input of the current sensor U1b;

The negative input of the current sensor U1b is connected to the power supply PGND of the equipment suspension system, the positive terminal of the power supply of the current sensor U1b is connected to VCC, the negative terminal of the power supply of the current sensor U1b is connected to -VCC, the output terminal of the current sensor U1b is connected to the first resistor R8b and resistor R9b terminal connection, and the second terminal of resistor R8b is connected to AGND.

The non-inverting input terminal of the operational amplifier U2b is connected with the second terminal of the resistor R9b and the first terminal of the resistor R10b, the second terminal of the resistor R10b is connected with AGND, the inverting input terminal of the operational amplifier U2b is connected with the resistor R3b, the resistor R6b, and the capacitor C1b for the first time. One end is connected, the second end of the resistor R6b is connected to AGND, the output end of the operational amplifier U2b is connected to the second end of the resistor R3b and the capacitor C1b;

The noninverting input terminal of the operational amplifier U3b is connected to the output terminal of the operational amplifier U2b, the inverting input terminal of the operational amplifier U3b is connected to the output terminal of the operational amplifier U3b, and the output terminal of the operational amplifier U3b is connected to the first end of the resistor R7b;

The positive terminals of the operational amplifier U2b and the operational amplifier U3b are connected to VCC, and the negative terminals of the operational amplifier are connected to -VCC.

The output terminal of the diode Q1b is connected to the second terminal of the resistor R7b, the first terminal of the capacitor C2b, and the logic processing module, the second terminal of the capacitor C2b is connected to AGND, the positive stage of the diode Q1b is connected to the second DC power supply VDD, and the negative stage of the diode Q1b is connected to the second DC power supply VDD. AGND connection.

The resistance R1b, resistance R2b, resistance R4b, and resistance R5b of the second voltage detection circuit belong to precision sampling resistors, and the sampling current is isolated by the current sensor U1b, and the current is converted into a voltage value by the precise use of the resistor R8b, And through the operational amplifier U2b and the operational amplifier U3b to adjust and follow the voltage, the output voltage range can be adjusted by adjusting the resistance of the resistor R3b, resistor R6b, resistor R7b, resistor R9b, and resistor R10b, among which the resistor R6b and the capacitor C1b and resistor R7b Composed of a filter circuit with capacitor C2b, the sampled analog voltage value is reliably and accurately input to the logic processing module. In order to prevent this circuit from failing and damaging the subsequent logic processing module, the diode Q1b is used to realize clamping protection.

As shown in Figure 4, the voltage discharge circuit includes resistor R1c, resistor R2c, resistor R3c, resistor R4c, resistor R5c, resistor R6c, resistor R7c, resistor R8c, resistor R9c, resistor R10c, resistor R11c, resistor R12c, resistor R13c, resistor R14c, resistor R15c, capacitor C1c, capacitor C2c, capacitor C3c, capacitor C4c, capacitor C5c, capacitor C6c, capacitor C7c, capacitor C8c, capacitor C9c, diode D1c, diode D2c, diode D3c, IGBT Q4c, transistor Q1c, transistor Q2c, transistor Q3c and isolation driver U1c; wherein,

Exemplarily, the isolation driver U1c may be an existing isolation driver chip.

The first terminal (terminal also referred to as a pin) of the isolated driver U1c is connected to DGND (ground) and the first terminal of the capacitor C1c;

The second terminal of the isolation driver U1c is connected to the second DC power supply VDD, the second terminal of the capacitor C1c, and the first terminal of the resistor R4c;

The third terminal of the isolation driver U1c is connected to the second terminal of the resistor R4c and the first terminal of the capacitor C6c;

The fourth terminal of the isolation driver U1c is connected to DGND and the second terminal of the capacitor C6c, the sixth terminal and the seventh terminal of the isolation driver U1c, the first terminal of the resistor R8c, the first terminal of the resistor R13c, and the first terminal of the capacitor C9c are connected; the resistor R8c The second end receives the PWM signal generated by the logic processing module;

The fifth terminal and the eighth terminal of the isolation driver U1c, the second terminal of the resistor R13c, the second terminal of the capacitor C9c, and DGND are connected;

The ninth terminal, the twelfth terminal, the sixteenth terminal of the isolation driver U1c, the first terminal of the capacitor C5c, the first terminal of the capacitor C7c, the first terminal of the capacitor C8c, the collector of the transistor Q2c, the collector of the transistor Q3c, and the first resistor R12c terminal connection;

The tenth terminal of the isolation driver U1c is connected to the first terminal of the resistor R14c and the base of the transistor Q3c;

The eleventh terminal of the isolation driver U1c is connected to the first terminal of the resistor R6c and the first terminal of the resistor R10c;

The thirteenth terminal of the isolation driver U1c is connected to the second terminal of the capacitor C5c, the first terminal of the capacitor C2c, the second terminal of the capacitor C7c, the second terminal of the capacitor C8c, the collector of the transistor Q1c, the negative pole of the diode D2c, and the first DC power supply VCC;

The fourteenth end of the isolation driver U1c is connected to the first end of the resistor R1c;

Isolate the sixteenth terminal of the driver U1c from the second terminal of the capacitor C2c, the first terminal of the capacitor C3c, the first terminal of the resistor R5c, the first terminal of the resistor R11c, the first terminal of the resistor R15c, the first terminal of the capacitor C4c, the positive stage of the diode D3c, PGND connection;

The fifteenth terminal of the isolation driver U1c is suspended;

The second end of the capacitor C3c is connected to the second end of the resistor R6c;

The second end of the resistor R1c is connected to the first end of the resistor R2c, the second end of the resistor R2c is connected to the first end of the resistor R3c, the second end of the resistor R3c is connected to the positive pole of the diode D1c, and the negative pole of the diode D1c is connected to the power supply POWER equipped with the suspension system ;

The base of the transistor Q1c is connected to the second end of the resistor R10c and the base of the transistor Q2c, the emitter of the transistor Q1c is connected to the emitter of the transistor Q2c, the first end of the resistor R7c, the first end of the resistor R9c, and the second end of the resistor R12c;

The emitter of the triode Q3c, the second end of the resistor R7c, the second end of the resistor R9c, the second end of the resistor R14c, the second end of the resistor R5c, the second end of the resistor R11c, the second end of the capacitor C4c, the positive pole of the diode D2c, and the negative pole of the diode D3c , the gate connection of the insulated gate bipolar transistor Q4c;

The drain of the IGBT Q4c is connected to the power supply POWER equipped with the suspension system, and the source of the IGBT Q4c is connected to the second end of the resistor R15c.

As shown in Figure 4, the sixth terminal of the isolation driver U1c of the voltage discharge circuit receives the PWM signal from the logic processing module, and after isolation, outputs it to the transistor Q1c and transistor Q2c through the eleventh terminal of the isolation driver U1c. The push-pull circuit amplifies the power of the PWM signal so that it can drive the first insulated gate bipolar transistor Q4c of the subsequent stage; the diode D3c belongs to a Zener diode and protects the insulated gate bipolar transistor Q4c from overvoltage damage; the triode Q3c It is used to eliminate the Miller effect generated by the IGBT Q4c, so as to prevent the IGBT Q4c from being turned on by mistake. When the voltage rises, the tenth terminal of the isolation driver U1c will output a low level, so that the collector of the triode Q3c and the emitter are turned on, at this time the gate of the IGBT Q4c is at a low level, and the tenth terminal of the isolation driver U1c is the Maitreya clamp port. When it is turned off, if the IGBT Q4c If the gate voltage is lower than 2V (relative to the output terminal power supply ground Vee), the gate voltage is in a monitored state, and the clamp output is activated at the same time, and the tenth terminal of the isolation driver U1c outputs a low level; if the insulated gate bipolar Transistor Q4c is short-circuited and damaged. The fourteenth terminal of the isolation driver U1c will detect a voltage, and report the fault signal to the logic processing module through the third terminal of the isolation driver U1c to realize fault protection. The third terminal (FAULT) of the isolation driver U1c is a fault Output terminal, when the fourteenth terminal of the isolation driver U1c exceeds the internal reference voltage, the FAULT pin changes from a high-impedance state to a logic low level, and a low level is used to indicate a fault; the fourteenth terminal of the isolation driver U1c is a saturation voltage On the input side, if the insulated gate bipolar transistor Q4c is short-circuited and damaged, the voltage of the fourteenth terminal pin of the isolation driver U1c exceeds 6.5V, and the eleventh terminal of the isolation driver U1c will gradually reduce the level to achieve "soft" off To avoid excessive di/dt and induced voltage, the fault signal is reported to the logic processing module through the third terminal of the isolation driver U1c to realize fault protection.

Capacitor C1c, capacitor C2c, capacitor C3c, capacitor C4c, capacitor C5c, capacitor C6c, capacitor C7c, capacitor C8c, capacitor C9c in the circuit are filter functions, reducing or eliminating the interference of power supply POWER equipped with suspension system; resistor R15c is low resistance The value of the high-power resistor, the energy generated by the parallel load in the system needs to be converted into heat energy through the resistor R15c for consumption.

Exemplarily, the resistor R15c is a low-resistance, high-power resistor. If it is detected that the system generates a parallel load, the logic processing module outputs a 10% duty cycle PWM signal to the voltage discharge circuit in FIG. 4 to discharge excess energy. The electric energy is converted into heat energy for consumption, and the bus voltage of the system is stabilized. If the system is not loaded in parallel, the logic processing module outputs a 0% duty ratio PWM signal to the voltage discharge circuit in FIG. 4 , that is, the voltage discharge circuit is in a closed state.

Exemplarily, if the sixth terminal of the isolated driver U1c of the voltage discharge circuit does not receive the PWM signal, the voltage discharge circuit does not work, that is, the parallel load discharge is not performed.

Exemplarily, if the voltage detection circuit in Figure 2 detects that the bus voltage POWER voltage exceeds 290V, the output level of U2a changes from high to low. Load working condition, at the same time, the logic processing module outputs a 10% duty cycle PWM signal to the voltage discharge circuit in Figure 4 to discharge excess energy. If the bus voltage POWER voltage is detected to be lower than 290V, the output level of U2a will change from low to low. At this time, the logic processing module detects a high level, and the system is considered to be working normally. At the same time, the logic processing module outputs a 0% duty cycle PWM signal to the voltage discharge circuit in Figure 4, and the isolation driver U1c turns off the voltage discharge circuit. put.

Exemplarily, the bus voltage detected by the voltage detection circuit in FIG. 3 is an analog quantity that changes linearly. If the bus voltage POWER voltage is 0V, the logic processing module detects it as 0V. If the bus voltage POWER voltage exceeds 300V, the logic processing module detects It is 3V, so it can be judged that if the logic processing module detects 2.9V, it is considered that the system has a sequential load condition, and the logic processing module outputs a 10% duty cycle PWM signal to Figure 4 to discharge excess energy. If the logic processing module detects that it is less than 2.6V, the system is considered to be working normally, and at the same time the logic processing module outputs a 0% duty cycle PWM signal to FIG. 4 (turn off the voltage discharge).

Claims (5)

1. A forward voltage bleeding control circuit for an on-board suspension lift system, comprising: the device comprises a first voltage detection circuit, a second voltage detection circuit, a voltage bleeder circuit and a logic processing module; the first voltage detection circuit is connected with a power supply of the suspension system and is used for detecting whether the bus voltage of the power supply exceeds a set threshold value and sending a detection result to the logic processing module; the second voltage detection circuit is connected with a power supply of the suspension system and is used for reducing the bus voltage of the power supply proportionally and sending the bus voltage to the logic processing module; the logic processing module is used for generating PWM signals according to the reduced voltage signals sent by the second voltage detection circuit and outputting the PWM signals to the voltage bleeder circuit when the detection results of the first voltage detection circuit and the second voltage detection circuit both indicate that the bus voltage exceeds a set threshold value; the voltage bleeder circuit is used for receiving the PWM signal from the logic processing module and realizing the bleeder control of the forward voltage;

the first voltage detection circuit includes: resistor R1a, resistor R2a, resistor R3a, resistor R4a, resistor R5a, resistor R6a, resistor R7a, resistor R8a, resistor R9a, resistor R10a, resistor R11a, capacitor C1a, capacitor C2a, comparator U1a, and optocoupler U2a; the first ends of the resistors R1a and R2a are connected with a power supply of the suspension system, the second ends of the resistors R1a and R2a are connected with the first ends of the resistors R3a and R4a, and the second ends of the resistors R3a and R4a are connected with the first ends of the resistors R7a, R8a and the capacitor C1 a; the second end of the resistor R8a is connected with the first end of the resistor R9a, and the second end of the resistor R9a and the capacitor C1a are grounded; the non-inverting input end of the comparator U1a is connected with the second end of the resistor R7a, the inverting input end of the comparator U1a is connected with the resistor R10a and the first end of the resistor R11a, the second end of the resistor R10a is connected with the first direct current power supply VCC, the second end of the resistor R11a is grounded, the output end of the comparator U1a is connected with the first ends of the resistor R5a and the capacitor C2a, and the second end of the resistor R5a is connected with the first direct current power supply VCC; the second end of the capacitor C2a is grounded; the input positive end of the optical coupler U2a is connected with the first end of the resistor R5a, the input negative end of the optical coupler U2a is grounded, the output positive end of the optical coupler U2a is connected with the logic processing module and the first end of the resistor R6a, the second end of the resistor R6a is connected with the second direct current power supply VDD, and the output negative end of the optical coupler U2a is grounded;

the second voltage detection circuit includes: resistor R1b, resistor R2b, resistor R3b, resistor R4b, resistor R5b, resistor R6b, resistor R7b, resistor R8b, resistor R9b, resistor R10b, capacitor C1b, capacitor C2b, current sensor U1b, operational amplifier U2b, operational amplifier U3b, and diode Q1b; the first ends of the resistor R1b and the resistor R2b are connected with a power supply of the suspension system, the second ends of the resistor R1b and the resistor R2b are connected with the first ends of the resistor R4b and the resistor R5b, the second ends of the resistor R4b and the resistor R5b are connected with the input of the current sensor U1b positively, the input of the current sensor U1b is grounded negatively, the output end of the current sensor U1b is connected with the first ends of the resistor R8 and the resistor R9b, and the second end of the resistor R8b is grounded; the non-inverting input end of the operational amplifier U2b is connected with the second end of the resistor R9b and the first end of the resistor R10b, the second end of the resistor R10b is grounded, the inverting input end of the operational amplifier U2b is connected with the first ends of the resistor R3b, the resistor R6b and the capacitor C1b, the second end of the resistor R6b is grounded, and the output end of the operational amplifier U2b is connected with the second ends of the resistor R3b and the capacitor C1 b; the non-inverting input end of the operational amplifier U3b is connected with the output end of the operational amplifier U2b, the inverting input end of the operational amplifier U3b is connected with the output end of the operational amplifier U3b, and the output end of the operational amplifier U3b is connected with the first end of the resistor R7 b; the output end of the diode Q1b is connected with the second end of the resistor R7b, the first end of the capacitor C2b and the logic processing module, the second end of the capacitor C2b is grounded, the positive stage of the diode Q1b is connected with the second direct current power supply VDD, and the negative stage of the diode Q1b is grounded;

the voltage bleeder circuit includes: resistor R1C, resistor R2C, resistor R3C, resistor R4C, resistor R5C, resistor R6C, resistor R7C, resistor R8C, resistor R9C, resistor R10C, resistor R11C, resistor R12C, resistor R13C, resistor R14C, resistor R15C, capacitor C1C, capacitor C2C, capacitor C3C, capacitor C4C, capacitor C5C, capacitor C6C, capacitor C7C, capacitor C8C, capacitor C9C, diode D1C, diode D2C, diode D3C, insulated gate bipolar transistor Q4C, transistor Q1C, transistor Q2C, transistor Q3C, and isolated driver U1C; wherein, the receiving pin of the isolation driver U1c is connected with the PWM output end of the logic processing module; the first end of the isolation driver U1C is connected with the DGND and the first end of the capacitor C1C; the second end of the isolation driver U1C is connected with the second direct current power supply VDD, the second end of the capacitor C1C and the first end of the resistor R4C; the third end of the isolation driver U1C is connected with the second end of the resistor R4C and the first end of the capacitor C6C; the fourth end of the isolation driver U1C is connected with the DGND and the second end of the capacitor C6C, and the sixth end of the isolation driver U1C is connected with the seventh end, the first end of the resistor R8C, the first end of the resistor R13C and the first end of the capacitor C9C; the fifth end and the eighth end of the isolation driver U1C, the second end of the resistor R13C, the second end of the capacitor C9C and the DGND are connected; the ninth end and the twelfth end of the isolation driver U1C, the sixteenth end, the first end of the capacitor C5C, the first end of the capacitor C7C, the first end of the capacitor C8C, the collector of the triode Q2C, the collector of the triode Q3C and the first end of the resistor R12C are connected; the tenth end of the isolation driver U1c is connected with the first end of the resistor R14c and the base electrode of the triode Q3 c; the tenth end of the isolation driver U1c is connected with the first end of the resistor R6c and the first end of the resistor R10 c; the tenth end of the isolation driver U1C is connected with the second end of the capacitor C5C, the first end of the capacitor C2C, the second end of the capacitor C7C, the second end of the capacitor C8C, the collector of the triode Q1C, the cathode of the diode D2C and the first direct current power supply VCC; the tenth terminal of the isolation driver U1c is connected with the first terminal of the resistor R1 c; the sixteenth end of the isolation driver U1C, the second end of the capacitor C2C, the first end of the capacitor C3C, the first end of the resistor R5C, the first end of the resistor R11C, the first end of the resistor R15C, the first end of the capacitor C4C and the positive stage of the diode D3C; the second end of the capacitor C3C is connected with the second end of the resistor R6C; the second end of the resistor R1c is connected with the first end of the resistor R2c, the second end of the resistor R2c is connected with the first end of the resistor R3c, the second end of the resistor R3c is connected with the positive stage of the diode D1c, and the negative stage of the diode D1c is connected with the POWER supply POWER of the suspension system; the base electrode of the triode Q1c is connected with the second end of the resistor R10c and the base electrode of the triode Q2c, and the emitter electrode of the triode Q1c is connected with the emitter electrode of the triode Q2c, the first end of the resistor R7c, the first end of the resistor R9c and the second end of the resistor R12 c; the emitter of the triode Q3C is connected with the second end of the resistor R7C, the second end of the resistor R9C, the second end of the resistor R14C, the second end of the resistor R5, the second end of the resistor R11C, the second end of the capacitor C4C, the positive electrode of the diode D2C, the negative electrode of the diode D3C and the grid electrode of the insulated gate bipolar transistor Q4C; the drain electrode of the insulated gate bipolar transistor Q4c is connected with a POWER supply POWER provided with a suspension system, and the source electrode of the insulated gate bipolar transistor Q4c is connected with the second end of the resistor R15 c.

2. The circuit of claim 1, wherein the logic processing module is further configured to turn off the output PWM signal when the detection results of the first voltage detection circuit and the second voltage detection circuit each indicate that the bus voltage does not exceed the set threshold.

3. The circuit of claim 1 or 2, wherein the logic processing module is further configured to shut down the output PWM signal and indicate a circuit failure when the detection result of the first voltage detection circuit indicates that the bus voltage does not exceed the set threshold and the detection result of the second voltage detection circuit indicates that the bus voltage exceeds the set threshold.

4. The circuit of claim 1 or 2, wherein the logic processing module is further configured to shut down the output PWM signal and indicate a circuit failure when the detection result of the second voltage detection circuit indicates that the bus voltage does not exceed the set threshold and the detection result of the first voltage detection circuit indicates that the bus voltage exceeds the set threshold.

5. The circuit of claim 1, wherein the logic processing module is further configured to receive a FAULT signal of the voltage bleeder circuit.

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