CN114884043A - A in same direction as year voltage control circuit that releases for machine carries linkage lift system - Google Patents
A in same direction as year voltage control circuit that releases for machine carries linkage lift system Download PDFInfo
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- CN114884043A CN114884043A CN202210579790.8A CN202210579790A CN114884043A CN 114884043 A CN114884043 A CN 114884043A CN 202210579790 A CN202210579790 A CN 202210579790A CN 114884043 A CN114884043 A CN 114884043A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/22—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices
Abstract
The invention provides a forward loading voltage discharge control circuit for an airborne suspension device lifting system, which comprises: 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 equipment suspension system and used for detecting whether the bus voltage of the power supply exceeds a set threshold value or not and sending a detection result to the logic processing module; the second voltage detection circuit is connected with a power supply of the equipment suspension system and used for reducing the bus voltage of the power supply in proportion and sending the bus voltage to the logic processing module; the logic processing module is used for generating 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 a set threshold value, and outputting the PWM signal to the voltage release circuit; and the voltage bleeder circuit is used for receiving the PWM signal from the logic processing module and realizing the bleeder control of the sequential load voltage.
Description
Technical Field
The invention belongs to the technical field of forward-loading voltage discharge control of an equipment suspension system, and particularly relates to a forward-loading voltage discharge control circuit for a lifting system of an airborne suspension device.
Background
At present, most of airplanes adopt an external hanging rack, the aircrafts are installed on the hanging rack through a mode of 'hand-lifting shoulder resistance' of ground service personnel or a ground lifting vehicle, the hanging rack is arranged outside the airplanes, visibility is better, installation is more convenient, ground lifting equipment is increased, higher requirements are provided for airplane security, if a plurality of ground loading vehicles are added on an aircraft carrier, more aircraft carrier space can be occupied, and fighting force is influenced. Meanwhile, in a wartime state, if the military aircraft lands at a civil airport, the civil airport can not prepare a ground loading vehicle in time, so that the preparation time for the aircraft operation is inevitably prolonged greatly, and the aircraft combat force is influenced.
With the development of an aircraft control system in the direction of multi-power and full-power, the conversion of an aircraft equipment suspension system to automatic control becomes a necessary trend, and the emerging problem is a safety problem, wherein the hidden danger is the impact of the downstream voltage on the control system, and the difficult problem is brought to the reliability and the stability of the aircraft equipment suspension system.
Disclosure of Invention
The invention provides a forward load voltage release control circuit for a lifting system of an airborne suspension device, which can realize detection and inhibition of forward load voltage, keep the voltage of a system bus stable and solve the problem of impact of the forward load voltage on a control system.
The invention provides a forward loading voltage discharge control circuit for an airborne suspension device lifting system, which comprises: the device comprises a first voltage detection circuit, a second voltage detection circuit, a voltage bleeder circuit and a logic processing module; wherein the content of the first and second substances,
the first voltage detection circuit is connected with a power supply of the equipment suspension system and used for detecting whether the bus voltage of the power supply exceeds a set threshold value or not and sending a detection result to the logic processing module;
the second voltage detection circuit is connected with a power supply of the equipment suspension system and used for reducing the bus voltage of the power supply in proportion and sending the bus voltage to the logic processing module;
the logic processing module is used for generating 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 a set threshold value, and outputting the PWM signal to the voltage release circuit;
and the voltage bleeder circuit is used for receiving the PWM signal from the logic processing module and realizing the bleeder control of the sequential 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 further configured to,
when the detection result of the first voltage detection circuit indicates that the bus voltage does not exceed the set threshold value, and the detection result of the second voltage detection circuit indicates that the bus voltage exceeds the set threshold value, the output PWM signal is turned off, and a circuit fault is prompted.
Optionally, the logic processing module is further configured to,
and when the detection result of the second voltage detection circuit indicates that the bus voltage does not exceed the set threshold value, and the detection result of the first voltage detection circuit indicates that the bus voltage exceeds the set threshold value, the output PWM signal is closed, and a circuit fault is prompted.
Optionally, the first voltage detection circuit includes: the circuit comprises 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, a capacitor C2a, a comparator U1a and an optical coupler U2 a; wherein the content of the first and second substances,
the resistor R1a and the first end of the resistor R2a are connected with a power supply of an equipment suspension system, the second ends of the resistor R1a and the resistor R2a are connected with the first ends of the resistor R3a and the resistor R4a, and the second ends of the resistor R3a and the resistor R4a are connected with the first ends of the resistor R7a, the resistor 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 ends 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 first ends of the resistor R10a and the resistor R11a, the second end of the resistor R10a is connected with a 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 positive level of opto-coupler U2a input is connected with the first end of resistance R5a, and opto-coupler U2a input negative level ground connection, opto-coupler U2a output positive pole with logic processing module and the first end of resistance R6a are connected, and resistance R6a second end and second DC power supply VDD connect, and opto-coupler U2a output negative pole ground connection.
Optionally, the second voltage detection circuit includes: a resistor R1b, a resistor R2b, a resistor R3b, a resistor R4b, a resistor R5b, a resistor R6b, a resistor R7b, a resistor R8b, a resistor R9b, a resistor R10b, a capacitor C1b, a capacitor C2b, a current sensor U1b, an operational amplifier U2b, an operational amplifier U3b and a diode Q1 b; wherein the content of the first and second substances,
the resistor R1b and the first end of the resistor R2b are connected with a power supply of an equipment 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 in a positive mode, the input of the current sensor U1b is grounded in a negative mode, 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.
Optionally, the voltage bleeder circuit includes: a resistor R1C, a resistor R2C, a resistor R3C, a resistor R4C, a resistor R5C, a resistor R6C, a resistor R7C, a resistor R8C, a resistor R9C, a resistor R10C, a resistor R11C, a resistor R12C, a resistor R13C, a resistor R14C, a resistor R15C, a capacitor C1C, a capacitor C2C, a capacitor C3C, a capacitor C4C, a capacitor C5C, a capacitor C6C, a capacitor C7C, a capacitor C8C, a capacitor C9C, a diode D1C, a diode D2C, a diode D3C, an insulated gate transistor Q4C, a bipolar transistor Q1C, a triode Q2C, a triode Q3C and an isolation driver U1C; wherein the content of the first and second substances,
the receiving pin of the isolation driver U1c is connected with the PWM output end of the logic processing module;
a first end of the isolation driver U1C is connected with a first end of DGND and a first end of a capacitor C1C;
the second end of the isolation driver U1C is connected with a 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, the sixth end and the seventh end of the isolation driver U1C are connected with the first end of a resistor R8C, the first end of a resistor R13C and the first end of a 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, the twelfth end, the sixteenth end, the first end of a capacitor C5C, the first end of a capacitor C7C, the first end of a capacitor C8C, the collector of a triode Q2C, the collector of a triode Q3C and the first end of a resistor R12C of the isolation driver U1C 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 thirteenth 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 fourteenth end of the isolation driver U1c is connected with the first end of the resistor R1 c;
a sixteenth end of an isolation driver U1C, a second end of a capacitor C2C, a first end of a capacitor C3C, a first end of a resistor R5C, a first end of a resistor R11C, a first end of a resistor R15C, a first end of a capacitor C4C, and a positive stage of a 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 level of the diode D1c, and the negative level of the diode D1c is connected with the POWER supply POWER of the equipment 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, 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;
an emitter of the triode Q3C is connected with a second end of the resistor R7C, a second end of the resistor R9C, a second end of the resistor R14C, a second end of the resistor R5, a second end of the resistor R11C, a second end of the capacitor C4C, a positive electrode of the diode D2C, a negative electrode of the diode D3C and a grid of the insulated gate bipolar transistor Q4C;
the drain electrode of the insulated gate bipolar transistor Q4c is connected with a POWER supply of the equipment suspension system, and the source electrode of the insulated gate bipolar transistor Q4c is connected with the second end of the resistor R15 c.
Optionally, the logic processing module is further configured to receive a FAULT signal of the voltage bleeder circuit.
The invention provides a forward-loading voltage discharge control circuit for an airborne suspension device lifting system, which can realize forward-loading voltage detection and inhibit, so that the system bus voltage is kept stable, the problem of impact of the forward-loading voltage on a control system is solved, the reliability and safety of the system are improved, and the completion of combat tasks, the life safety of aircrafts and personnel and the like are ensured.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a forward load voltage bleed control circuit for an airborne suspension lifting system provided in accordance with the present invention;
FIG. 2 is a schematic diagram of a first voltage detection circuit according to the present invention;
FIG. 3 is a schematic diagram of a second voltage detection circuit according to the present invention;
fig. 4 is a schematic diagram of a voltage relief structure of the equipment suspension system provided by the present invention.
Detailed Description
The present invention provides a forward load voltage bleed control circuit for an airborne suspension system, which is explained with reference to the accompanying drawings.
As shown in fig. 1, the present invention provides a forward load voltage bleed control circuit for an airborne suspension 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 an equipment 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 equipment suspension system and used for reducing the bus voltage of the power supply in proportion and sending the bus voltage to the logic processing module;
the logic processing module is used for generating 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 a set threshold value, and outputting the PWM signal to the voltage release circuit;
and the voltage bleeder circuit is used for receiving the PWM signal from the logic processing module and realizing the bleeder control of the sequential load voltage.
Illustratively, the logic processing module implements output of the PWM signal according to the feedback signal, including the following cases:
if the feedback signal of the first voltage detection circuit is at a low level and the feedback analog quantity of the second voltage detection circuit exceeds a set threshold value, the logic processing module can output a PWM signal to the voltage release circuit, and the duty ratio of the output PWM signal is determined by the magnitude of the feedback analog quantity of the second voltage detection circuit;
if the feedback signal of the first voltage detection circuit is high level and the feedback analog quantity of the second voltage detection circuit does not exceed the set threshold value, 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 a set threshold value, the circuit is in fault, and the logic processing module closes to output a PWM signal;
if the feedback signal of the first voltage detection circuit is low level and the feedback analog quantity of the second voltage detection circuit does not exceed the set threshold value, the circuit is in fault, and the logic processing module closes to output the PWM signal.
As shown in fig. 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, a capacitor C2a, a comparator U1a, and an optocoupler U2 a;
the first ends of the resistor R1a and the resistor R2a are connected with a POWER supply of a suspension system, the second end of the resistor R1a is connected with the second end of the resistor R2a, the second ends of the resistor R1a and the resistor R2a are connected with the first ends of the resistor R3a and the resistor R4a, and the second ends of the resistor R3a and the resistor R4a are connected with the first ends of the resistor R7a, the resistor R8a and the capacitor C1 a.
A first end of the resistor R9a is connected with a second end of the resistor R8a, and a second end of the resistor R9a and a second end of the capacitor C1a are connected with a power supply PGND (grounded) of the equipment suspension system;
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 first ends of the resistor R10a and the resistor R11a, the second end of the resistor R10a is connected with a first direct-current power supply VCC, the second end of the resistor R11a is connected with GND (grounded), the power supply positive end of the comparator U1a is connected with VCC, the power supply negative end of the comparator U1a is connected with GND, 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 VCC;
the input positive level of the optical coupler U2a is connected with the first end of the resistor R5a, the input negative level of the optical coupler U2a is connected with GND, the output positive level of the optical coupler U2a (VOUT1) is connected with the first end of the resistor R6a and the logic processing module, the second end of the resistor R6a is connected with a second direct-current power supply VDD, and the output negative level of the optical coupler U2a is connected with AGND (grounded).
The resistor R1a, the resistor R2a, the resistor R3a, the resistor R4a, the resistor R5a, the resistor R6a, the resistor R8a and the resistor R9a of the first voltage detection circuit belong to precise sampling resistors, the resistance of the resistors is large so as not to affect the working performance of a motor in a system, the resistors are used for dividing the voltage of a POWER supply of an equipment suspension system and adjusting the voltage to be within a reasonable voltage range, the sampling voltage is filtered by the resistor R7a and the capacitor C1a and then is sent to the non-inverting input end of the comparator U1a, and the comparison threshold (also called as a set threshold) of the inverting input end of the comparator U1a is obtained by dividing the voltage by the resistor R10a and the resistor R11 a. If the POWER supply of the suspension system is higher than a set threshold, the output end of the comparator U1a is high voltage, namely the front stage of the optocoupler U2a is conducted, and the output of the rear stage is low level; if the POWER supply of the suspension system is lower than a set threshold value, the output end of the comparator U1a is low voltage, namely the front stage of the optocoupler U2a is cut off, and the output of the rear stage is high level. The detection early warning of the forward-loading voltage rise is realized through the circuit, the isolation of strong and weak current is realized through the optocoupler U2a, and the discrete quantity value is sent into the logic processing module.
Illustratively, the first dc power source VCC may be a 15V dc power source, and the second dc power source VDD may be a 3.3V dc power source.
As shown in fig. 3, the second voltage detection circuit includes a resistor R1b, a resistor R2b, a resistor R3b, a resistor R4b, a resistor R5b, a resistor R6b, a resistor R7b, a resistor R8b, a resistor R9b, a resistor R10b, a capacitor C1b, a capacitor C2b, a current sensor U1b, an operational amplifier U2b, an operational amplifier U3b, and a diode Q1 b; wherein the content of the first and second substances,
the first ends of the resistor R1b and the resistor R2b are connected with a POWER supply of a suspension system, the second end of the resistor R1b is connected with the second end of the resistor R2b, 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, and the second ends of the resistor R4b and the resistor R5b are positively connected with the input of the current sensor U1 b;
the input of the current sensor U1b is negative and is connected with a power supply PGND of an equipment suspension system, the power supply positive end of the current sensor U1b is connected with VCC, the power supply negative end of the current sensor U1b is connected with VCC, the output end of the current sensor U1b is connected with the first ends of a resistor R8b and a resistor R9b, and the second end of the resistor R8b is connected with AGND.
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 connected with AGND, 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 connected with AGND, 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 operational amplifier U2b and the operational amplifier U3b have the positive power supply terminal connected to VCC and the negative power supply terminal connected to-VCC.
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 connected with AGND, 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 connected with AGND.
The resistor R1b, the resistor R2b, the resistor R4b and the resistor R5b of the second voltage detection circuit belong to a precise sampling resistor, sampling current is isolated through the current sensor U1b, the adopted current is converted into a voltage value through the resistor R8b which is precisely adopted, the voltage value is adjusted and voltage-followed through the operational amplifier U2b and the operational amplifier U3b, the output voltage range adjustment can be realized by adjusting the resistance values of the resistor R3b, the resistor R6b, the resistor R7b, the resistor R9b and the resistor R10b, wherein the resistor R6b, the capacitor C1b, the resistor R7b and the capacitor C2b form a filter circuit, the sampled analog voltage value is reliably and accurately input into the logic processing module, in order to prevent the circuit from failing and damaging the post-stage logic processing module, and clamp protection is realized through the diode Q1 b.
As shown in fig. 4, the voltage bleeder circuit includes a resistor R1C, a resistor R2C, a resistor R3C, a resistor R4C, a resistor R5C, a resistor R6C, a resistor R7C, a resistor R8C, a resistor R9C, a resistor R10C, a resistor R11C, a resistor R12C, a resistor R13C, a resistor R14C, a resistor R15C, a capacitor C1C, a capacitor C2C, a capacitor C3C, a capacitor C4C, a capacitor C5C, a capacitor C6C, a capacitor C7C, a capacitor C8C, a capacitor C9C, a diode D1C, a diode D2C, a diode D3C, an insulated gate bipolar transistor Q4C, a transistor Q1C, a transistor Q2C, a transistor Q3C, and an isolation driver U1C; wherein the content of the first and second substances,
for example, the isolation driver U1c may be an existing isolation driver chip.
A first terminal (terminal also referred to as a pin) of the isolation driver U1C is connected to DGND (ground), a first terminal of a capacitor C1C;
the second end of the isolation driver U1C is connected with a 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, the sixth end and the seventh end of the isolation driver U1C are connected with the first end of a resistor R8C, the first end of a resistor R13C and the first end of a capacitor C9C; the second end of the resistor R8c receives the PWM signal generated by the logic processing module;
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 thirteenth 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 fourteenth end of the isolation driver U1c is connected with the first end of the resistor R1 c;
the sixteenth end of the isolation driver U1C is connected with 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, the positive stage of the diode D3C and PGND;
the fifteenth end of isolation driver U1c is floating;
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 anode of a diode D1c, and the cathode of the diode D1c is connected with a POWER supply POWER of the equipment 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, 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;
an emitter of the triode Q3C is connected with a second end of the resistor R7C, a second end of the resistor R9C, a second end of the resistor R14C, a second end of the resistor R5C, a second end of the resistor R11C, a second end of the capacitor C4C, an anode of the diode D2C, a cathode of the diode D3C and a gate of the insulated gate bipolar transistor Q4C;
the drain electrode of the insulated gate bipolar transistor Q4c is connected with a POWER supply of the equipment suspension system, and the source electrode of the insulated gate bipolar transistor Q4c is connected with the second end of the resistor R15 c.
As shown in fig. 4, the sixth end of the isolation driver U1c of the voltage bleeder circuit receives the PWM signal from the logic processing module, and the PWM signal is output to the push-pull circuit composed of the transistor Q1c and the transistor Q2c through the eleventh end of the isolation driver U1c after being isolated, so that the PWM signal is power-amplified, and the first igbt Q4c of the subsequent stage can be driven; the diode D3c belongs to a voltage stabilizing diode and protects the insulated gate bipolar transistor Q4c from overvoltage damage; the triode Q3c is used for eliminating the miller effect generated by the igbt Q4c, so as to prevent the igbt Q4c from turning on by mistake, when the voltage rises, the tenth terminal of the isolation driver U1c outputs a low level, so that the collector and emitter of the triode Q3c are turned on, and at this time, the gate of the igbt Q4c is at the low level, wherein the tenth terminal of the isolation driver U1c is a miller clamp port, and when the mosfet Q1 is turned off, if the gate voltage of the igbt Q4c is lower than 2V (relative to the output terminal power ground Vee), the gate voltage is in a monitored state, and the clamp output is activated, and the tenth terminal of the isolation driver U1c outputs the low level; if the insulated gate bipolar transistor Q4c is damaged due to short circuit, the voltage is detected at the fourteenth end of the isolation driver U1c, a FAULT signal is reported to the logic processing module through the third end of the isolation driver U1c, FAULT protection is realized, the third end (FAULT) of the isolation driver U1c is a FAULT output end, when the fourteenth end of the isolation driver U1c exceeds the internal reference voltage, a FAULT pin is converted into a logic low level from a high-resistance state, and the FAULT is represented by a low level; the fourteenth end of the isolation driver U1c is a saturation voltage input end, if the insulated gate bipolar transistor Q4c is short-circuited and damaged, the voltage of the fourteenth end pin of the isolation driver U1c exceeds 6.5V, the tenth end of the isolation driver U1c gradually reduces the level to realize 'soft' turn-off, excessive di/dt and induction voltage are avoided, a fault signal is reported to the logic processing module through the third end of the isolation driver U1c, and fault protection is realized.
In the circuit, a capacitor C1C, a capacitor C2C, a capacitor C3C, a capacitor C4C, a capacitor C5C, a capacitor C6C, a capacitor C7C, a capacitor C8C and a capacitor C9C all have a filtering function, so that the interference of a POWER supply POWER of an equipment suspension system is reduced or eliminated; the resistor R15c is a high-power resistor with low resistance, and the energy generated by the system due to the forward load needs to be converted into heat energy through the resistor R15c for consumption.
Illustratively, the resistor R15c is a low-resistance high-power resistor, and if it is detected that the system generates a forward load, the logic processing module outputs a 10% duty ratio PWM signal to the voltage bleeding circuit in fig. 4 to bleed off excess energy, so as to convert electric energy into heat energy for consumption, thereby achieving bus voltage stabilization of the system. If the system is not in the forward load state, the logic processing module outputs a 0% duty ratio PWM signal to the voltage bleeding circuit in fig. 4, that is, the voltage bleeding circuit is in the off state.
For example, if the sixth terminal of the isolation driver U1c of the voltage bleeder circuit does not receive the PWM signal, the voltage bleeder circuit does not operate, i.e., does not perform forward bleeding.
For example, if the voltage detection circuit in fig. 2 detects that the bus voltage POWER voltage exceeds 290V, the output level of U2a changes from high to low, and at this time, the logic processing module detects low, it is considered that a forward loading condition occurs in the system, and at the same time, the logic processing module outputs a 10% duty ratio PWM signal to the voltage bleeding circuit in fig. 4 to bleed off excess energy, and if the bus voltage POWER voltage is detected to be lower than 290V, the output level of U2a changes from low to high, and at this time, the logic processing module detects high, it is considered that the system is working normally, and at the same time, the logic processing module outputs a 0% duty ratio PWM signal to the voltage bleeding circuit in fig. 4, and the isolation driver U1c turns off voltage bleeding.
Illustratively, 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 the bus voltage as 0V, if the bus voltage POWER voltage exceeds 300V, the logic processing module detects the bus voltage as 3V, and therefore it can be determined that, if the logic processing module detects 2.9V, the system is considered to have a forward-loading condition, and meanwhile, the logic processing module outputs a 10% duty ratio PWM signal to fig. 4, and excess energy is discharged. If the logic processing module detects that the voltage is less than 2.6V, the system is considered to work normally, and meanwhile, the logic processing module outputs a 0% duty ratio PWM signal to the graph 4 (voltage leakage is closed).
Claims (8)
1. A forward load voltage bleed control circuit for an airborne suspension hoist system, comprising: the device comprises a first voltage detection circuit, a second voltage detection circuit, a voltage bleeder circuit and a logic processing module; wherein the content of the first and second substances,
the first voltage detection circuit is connected with a power supply of the equipment suspension system and used for detecting whether the bus voltage of the power supply exceeds a set threshold value or not and sending a detection result to the logic processing module;
the second voltage detection circuit is connected with a power supply of the equipment suspension system and used for reducing the bus voltage of the power supply in proportion and sending the bus voltage to the logic processing module;
the logic processing module is used for generating 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 a set threshold value, and outputting the PWM signal to the voltage release circuit;
and the voltage bleeder circuit is used for receiving the PWM signal from the logic processing module and realizing the bleeder control of the sequential load voltage.
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 both 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,
when the detection result of the first voltage detection circuit indicates that the bus voltage does not exceed the set threshold value, and the detection result of the second voltage detection circuit indicates that the bus voltage exceeds the set threshold value, the output PWM signal is turned off, and a circuit fault is prompted.
4. The circuit of claim 1 or 2, wherein the logic processing module is further configured to,
and when the detection result of the second voltage detection circuit indicates that the bus voltage does not exceed the set threshold value, and the detection result of the first voltage detection circuit indicates that the bus voltage exceeds the set threshold value, the output PWM signal is closed, and a circuit fault is prompted.
5. The circuit of claim 1, wherein the first voltage detection circuit comprises: the circuit comprises 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, a capacitor C2a, a comparator U1a and an optical coupler U2 a; wherein the content of the first and second substances,
the resistor R1a and the first end of the resistor R2a are connected with a power supply of an equipment suspension system, the second ends of the resistor R1a and the resistor R2a are connected with the first ends of the resistor R3a and the resistor R4a, and the second ends of the resistor R3a and the resistor R4a are connected with the first ends of the resistor R7a, the resistor 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 ends 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 first ends of the resistor R10a and the resistor R11a, the second end of the resistor R10a is connected with a 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 positive level of opto-coupler U2a input is connected with the first end of resistance R5a, and opto-coupler U2a input negative level ground connection, opto-coupler U2a output positive pole with logic processing module and the first end of resistance R6a are connected, and resistance R6a second end and second DC power supply VDD connect, and opto-coupler U2a output negative pole ground connection.
6. The circuit of claim 1, wherein the second voltage detection circuit comprises: a resistor R1b, a resistor R2b, a resistor R3b, a resistor R4b, a resistor R5b, a resistor R6b, a resistor R7b, a resistor R8b, a resistor R9b, a resistor R10b, a capacitor C1b, a capacitor C2b, a current sensor U1b, an operational amplifier U2b, an operational amplifier U3b and a diode Q1 b; wherein the content of the first and second substances,
the resistor R1b and the first end of the resistor R2b are connected with a power supply of an equipment 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 in a positive mode, the input of the current sensor U1b is grounded in a negative mode, 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.
7. The circuit of claim 1, wherein the voltage bleed circuit comprises: a resistor R1C, a resistor R2C, a resistor R3C, a resistor R4C, a resistor R5C, a resistor R6C, a resistor R7C, a resistor R8C, a resistor R9C, a resistor R10C, a resistor R11C, a resistor R12C, a resistor R13C, a resistor R14C, a resistor R15C, a capacitor C1C, a capacitor C2C, a capacitor C3C, a capacitor C4C, a capacitor C5C, a capacitor C6C, a capacitor C7C, a capacitor C8C, a capacitor C9C, a diode D1C, a diode D2C, a diode D3C, an insulated gate transistor Q4C, a bipolar transistor Q1C, a triode Q2C, a triode Q3C and an isolation driver U1C; wherein the content of the first and second substances,
the receiving pin of the isolation driver U1c is connected with the PWM output end of the logic processing module;
a first end of the isolation driver U1C is connected with a first end of DGND and a first end of a capacitor C1C;
the second end of the isolation driver U1C is connected with a 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, the sixth end and the seventh end of the isolation driver U1C are connected with the first end of a resistor R8C, the first end of a resistor R13C and the first end of a 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, the twelfth end, the sixteenth end, the first end of a capacitor C5C, the first end of a capacitor C7C, the first end of a capacitor C8C, the collector of a triode Q2C, the collector of a triode Q3C and the first end of a resistor R12C of the isolation driver U1C 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 thirteenth 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 fourteenth end of the isolation driver U1c is connected with the first end of the resistor R1 c;
a sixteenth end of an isolation driver U1C, a second end of a capacitor C2C, a first end of a capacitor C3C, a first end of a resistor R5C, a first end of a resistor R11C, a first end of a resistor R15C, a first end of a capacitor C4C, and a positive stage of a 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 level of the diode D1c, and the negative level of the diode D1c is connected with the POWER supply POWER of the equipment 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, 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;
an emitter of the triode Q3C is connected with a second end of the resistor R7C, a second end of the resistor R9C, a second end of the resistor R14C, a second end of the resistor R5, a second end of the resistor R11C, a second end of the capacitor C4C, a positive electrode of the diode D2C, a negative electrode of the diode D3C and a grid of the insulated gate bipolar transistor Q4C;
the drain electrode of the insulated gate bipolar transistor Q4c is connected with a POWER supply of the equipment suspension system, and the source electrode of the insulated gate bipolar transistor Q4c is connected with the second end of the resistor R15 c.
8. 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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