CN108447735B - Capacitive load impact resistant double-path high-voltage control assembly and closing control method thereof - Google Patents
Capacitive load impact resistant double-path high-voltage control assembly and closing control method thereof Download PDFInfo
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- CN108447735B CN108447735B CN201810440344.2A CN201810440344A CN108447735B CN 108447735 B CN108447735 B CN 108447735B CN 201810440344 A CN201810440344 A CN 201810440344A CN 108447735 B CN108447735 B CN 108447735B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
- H01H47/001—Functional circuits, e.g. logic, sequencing, interlocking circuits
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
- H01H47/002—Monitoring or fail-safe circuits
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
- H01H47/02—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for modifying the operation of the relay
- H01H47/18—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for modifying the operation of the relay for introducing delay in the operation of the relay
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Abstract
The application discloses a capacitive load impact resistant double-circuit high-voltage control component and a closing control method thereof, wherein a first relay normally-open contact is connected with a capacitive load in series and then connected with two ends of a power battery in parallel, a second relay normally-open contact is connected with a resistive load in series and then connected with two ends of the power battery in parallel, an A intelligent control module, an A first relay normally-open contact and a first current limiting resistor are connected with two ends of the first relay normally-open contact in parallel, the A first relay normally-open contact is connected with the first current limiting resistor in series and then connected with two ends of the first relay normally-open contact in parallel, and the A intelligent control module and the B intelligent control module respectively comprise a relay control coil output end, a relay control coil output end and a control module control signal input end; the high-voltage direct-current contactor can effectively avoid large current impact when the main relay is closed, is compatible with resistive and inductive loads, reduces the instant impact current of the high-voltage direct-current contactor when the main relay is closed, and prolongs the service life and safety reliability of the relay contact.
Description
Technical Field
The present application relates to a high voltage control module, and more particularly, to a high voltage control module for use in various high voltage driving parts of an auxiliary system of a new energy automobile.
Background
The variable-frequency air conditioner compressor, the PTC heater, the hydraulic steering booster pump, the air brake air compression pump and the like of the auxiliary system of the new energy automobile are driven by high voltage and are directly powered by the HV power battery, and the driver is connected with the power battery through a high-voltage direct-current contactor. In a typical capacitive load circuit, as shown in fig. 1, assuming that the power supply voltage is 600V, the current at the closing moment of the first relay S1 of the capacitive load is a=600v/0.1Ω=6000A, where 0.1Ω is an equivalent resistance RAJ generated at the closing moment of the first relay S1 of the capacitive load, and it is obvious that the current is too large, and the contact of the first relay S1 is impacted by the instantaneous large current, so that the service life of the first relay S1 is greatly reduced. When the same relay contact S2 resistive load PTC heater (with a typical resistance value of 300 ohms) is closed, the closing current of the second relay contact S2 is A=600V/300Ω (2A), and the closing current can be very small and has little influence on the relay contact S2. Although some high-power occasions basically avoid large current impact by bypassing the pre-charging relay on the main relay and adding a current-limiting resistor, and meanwhile, the pre-charging logic needs to be controlled by a controller program, the defects of complex control, high program overhead, large volume, high hardware cost and the like also exist.
Disclosure of Invention
The application aims to solve the problems that the high-voltage direct-current contactor is extremely large in impulse current at the closing moment in each high-voltage driver in the existing auxiliary system of the new energy automobile, the relay contacts are extremely easy to adhere, the relay contacts are separated and fail, the power supply is cut off out of control, and the damage is extremely large; or the current situations that the controller is complex in program control, large in size, high in control cost and the like are provided, the capacitive load transient large current impact can be effectively avoided when the main relay is closed, meanwhile, the capacitive load transient large current impact can be compatible with resistive and inductive loads, the transient impact current of the high-voltage direct-current contactor in closing is reduced, the service life of the relay contact is prolonged, and the use safety and reliability of the driver are improved.
The application adopts the concrete technical scheme for solving the technical problems that: the utility model provides an anti capacitive load impact double-circuit high voltage control subassembly, includes anti appearance subassembly circuit, and anti appearance subassembly circuit adopts first relay, second relay, capacitive load and resistance load to make up and constitutes, and first relay normally open contact connects in parallel at power battery both ends after establishing ties with the capacitive load, and second relay normally open contact connects in parallel at power battery both ends after establishing ties with resistance load, its characterized in that: the intelligent control system comprises a first relay normally open contact, a first current limiting resistor, an intelligent control module A, a second relay normally open contact and a second current limiting resistor, wherein the first relay normally open contact is connected with the first current limiting resistor in series and then connected with the two ends of the first relay normally open contact in parallel; the intelligent control module comprises a second relay control coil output end, a second relay control coil output end and a B intelligent control module control signal input end. When the capacitive load is charged with small current through the current limiting resistor, the normally open contact of the high-voltage direct-current relay of the first relay is not closed; when the voltage difference between the two ends of the high-voltage direct-current relay contact of the first relay is almost zero volt after the voltage of the two ends of the capacitive load rises, the normally open contact of the high-voltage direct-current relay of the first relay is closed and does not bear the impact of large current. The high-voltage direct-current contactor can effectively avoid instant large current impact of capacitive load when the main relay is closed, can be compatible with resistive and inductive loads, reduces instant impact current of the high-voltage direct-current contactor when the main relay is closed, prolongs the service life of the relay contact, and improves the use safety and reliability of the driver.
Preferably, the intelligent control module A and the intelligent control module B adopt two groups of intelligent control modules with the same control structure, the intelligent control module comprises a load starting control input signal, a bridge rectifier circuit, a voltage stabilizing circuit, an A first relay normally-open contact delay closing circuit and a first relay normally-open contact delay energizing circuit, wherein the load starting control input signal is electrically connected with the input end of the bridge rectifier circuit, the output end of the bridge rectifier circuit is electrically connected with the input end of the voltage stabilizing circuit, the rear stage of the voltage stabilizing circuit is electrically connected with the A first relay normally-open contact delay closing circuit, the rear stage of the A first relay normally-open contact delay closing circuit is electrically connected with the first relay normally-open contact delay energizing circuit, and the output end of the A first relay normally-open contact delay energizing circuit is electrically connected with the output end of the A first relay control coil. The working process of the double-channel capacitive load resistance redundant circuit is the same, and the double-channel capacitive load resistance redundant circuit is better suitable for the actual application environment of a vehicle.
Preferably, the delay closing circuit of the normally open contact of the first relay A is formed by a first voltage comparator, a 21 st resistor, a 22 nd resistor, a 23 rd resistor, a 21 st capacitor and a second N-channel MOS tube, wherein one end of the 21 st resistor is connected with the 21 st capacitor in series, the other end of the 21 st resistor is electrically connected with the positive electrode of the output end of the voltage stabilizing circuit, one end of the 22 nd resistor is connected with the 23 rd resistor in series, the other end of the 22 nd resistor is electrically connected with the positive electrode of the output end of the voltage stabilizing circuit, a series node of the 21 st resistor and the 21 st capacitor is electrically connected with the reverse input end of the first comparator, a series node of the 22 nd resistor and the 23 rd resistor is electrically connected with the positive input end of the first comparator, the output end of the first comparator is electrically connected with the grid input end of the second N-channel MOS tube, and the drain output end of the second N-channel MOS tube is electrically connected with the output end of the control coil of the first relay A. The reliability and stability of charging boosting, which is basically the same as the power supply voltage, of the charging voltage at two ends of the capacitive load are improved, and the impact damage of the normally open contact closing current of the first relay is reduced.
Preferably, the delay energizing circuit of the normally open contact of the first relay A is formed by a second voltage comparator, a 24 th resistor, a 22 nd capacitor, a 22 nd resistor, a 23 rd resistor and a first N-channel MOS tube, one end of the 22 nd resistor is connected with the 23 rd resistor in series, the other end of the 22 nd resistor is electrically connected with the positive electrode of the output end of the voltage stabilizing circuit, and the serial node of the 22 nd resistor and the 23 rd resistor is electrically connected with the reverse input end of the second comparator; one end of the 24 th resistor is connected with the 22 nd capacitor in series, the other end of the 24 th resistor is electrically connected with the positive electrode of the output end of the voltage stabilizing circuit, the serial connection node of the 22 nd resistor and the 22 nd capacitor is electrically connected with the positive input end of the second comparator, the output end of the second comparator is electrically connected with the input end of the grid electrode of the first N-channel MOS tube, and the output end of the drain electrode of the first N-channel MOS tube is electrically connected with the output end of the control coil of the first relay. The charging voltage at two ends of the capacitive load is improved to be basically the same as the power supply voltage in reliability and stability of charging and boosting, the closing current impact damage of the normally open contact of the first relay is reduced, and the service life of the normally open contact of the first relay is prolonged.
Preferably, the voltage stabilizing circuit is formed by jointly and electrically connecting a voltage-reducing voltage stabilizing chip with the model LM2596-12, a 29 th capacitor, a 30 th capacitor, a 10 th voltage stabilizing diode and a 3 rd inductor, wherein the 29 th capacitor is connected in parallel with the input end of the voltage-reducing voltage stabilizing chip, the 30 th capacitor is connected in parallel with the output end of the voltage-reducing voltage stabilizing chip, the 10 th voltage stabilizing diode is connected in parallel with the output end of the voltage-reducing voltage stabilizing chip, the cathode of the 10 th voltage stabilizing diode is electrically connected with the output end of the voltage-reducing voltage stabilizing chip, the 29 th capacitor and the 30 th capacitor are electrolytic capacitors, and the cathodes of the 29 th capacitor and the 30 th capacitor are electrically connected with the cathode of the voltage stabilizing circuit. And the working stability and the reliability of the power supply are improved.
Preferably, the intelligent control module A and the intelligent control module B both adopt a double-voltage comparator and a double-N-channel MOS tube, wherein the first relay normally-open contact delay closing circuit A and the first relay normally-open contact delay energizing circuit A use the same double-voltage comparator and double-N-channel MOS tube.
Preferably, the bridge rectifier circuit adopts the 5 th rectifier diode, the 6 th rectifier diode, the 7 th rectifier diode and the 8 th rectifier diode to be electrically connected together to form the bridge rectifier circuit, the input end of the bridge rectifier circuit is electrically connected with the load starting control signal, and the output end of the bridge rectifier circuit is electrically connected with the voltage stabilizing circuit. The rectifying reliability and effectiveness of the load starting control signal are improved.
Another object of the present application is to provide a capacitive load impact resistant dual-path high voltage control module closing control method, which is characterized by comprising the following control processes
a. When the load starting control signal receives a control electric signal, a second N-channel MOS tube in the A intelligent control module is conducted in a pilot mode, the A first relay in one of the technical schemes is firstly closed, a normally open contact of a high-voltage direct-current relay of the A first relay is firstly closed, and a smaller circuit is used for charging a first capacitive load;
b. after hundreds of milliseconds, the capacitive load is precharged to more than 80%, the first N-channel MOS tube is conducted, and the normally open contact of the high-voltage direct-current relay of the first relay is closed close to 0 current;
c. after tens of milliseconds, the high-voltage direct-current relay of the second relay A is close to a 0-current shutoff contact;
in the control process, when the high-voltage direct-current relay normally-open contact of the first relay is closed firstly and charges capacitive load with small current through the current limiting resistor, the high-voltage direct-current relay normally-open contact of the first relay is not closed every time the control process is used; when the voltage difference between the two ends of the high-voltage direct-current relay contact of the first relay is almost zero volt after the voltage of the two ends of the capacitive load rises, the normally open contact of the high-voltage direct-current relay of the first relay is closed and does not bear the impact of large current.
The beneficial effects of the application are as follows: when the capacitive load is charged with small current through the current limiting resistor, the normally open contact of the high-voltage direct-current relay of the first relay is not closed; when the voltage difference between the two ends of the high-voltage direct-current relay contact of the first relay is almost zero volt after the voltage of the two ends of the capacitive load rises, the normally open contact of the high-voltage direct-current relay of the first relay is closed and does not bear the impact of large current. The use cost of the first relay is greatly reduced, the control structure is simple, the manufacturing weight is low, the volume is small, the power consumption is low, and the service life of the relay is prolonged. Aiming at the market demands of high-voltage driving components of auxiliary systems of new energy automobiles, such as air conditioners, PTC, booster pumps and the like, the capacitive load impact resistant double-circuit high-voltage control component is developed and produced, is compatible with resistive loads and inductive loads, does not need program control, has small volume and simple control logic, and better meets the integration of auxiliary systems of new energy automobiles.
Drawings
The application is described in further detail below with reference to the drawings and the detailed description.
Fig. 1 is a schematic block diagram of a capacitive load impact resistant dual-channel high voltage control assembly of the present application.
Fig. 2 is a schematic circuit structure diagram of an intelligent control module in the capacitive load impact resistant two-way high-voltage control assembly.
Fig. 3 is a schematic diagram of a typical circuit structure of a capacitor-resisting assembly in the prior art.
Detailed Description
In the embodiment shown in fig. 1 and fig. 2, a capacitive load impact resistant dual-path high-voltage control component comprises a capacitive load resistant component circuit, wherein the capacitive load resistant component circuit is formed by combining a first relay, a second relay, a capacitive load and a resistive load, a first relay normally-open contact S1A and a capacitive load CA are connected in series and then connected at two ends of a power battery in parallel, a second relay normally-open contact S1B and a resistive load PTC are connected in series and then connected at two ends of a power battery BAT in parallel, an intelligent control module 10, a first relay normally-open contact S2A and a first current limiting resistor RA are connected in parallel at two ends of the first relay normally-open contact S1A, the intelligent control module 10 comprises a first relay control coil output end 12, a first relay control coil output end 11 and an intelligent control module control signal input end 13, and a channel A anti-capacitive load redundancy circuit is formed together; the two ends of the second relay normally open contact S1B are connected with the B intelligent control module 20, the B second relay normally open contact S2B and the second current limiting resistor RB in parallel, wherein the B second relay normally open contact S2B is connected with the two ends of the second relay normally open contact S1B in series with the second current limiting resistor RB in parallel, the B intelligent control module 20 comprises a second relay control coil output end 22, a B second relay control coil output end 21 and a B intelligent control module control signal input end 23, and a channel B capacitive load resistance redundant circuit is formed together. The channel A capacitive load resisting redundant circuit and the channel B capacitive load resisting redundant circuit are combined into a double-channel capacitive load resisting redundant circuit, the double-channel capacitive load resisting redundant circuit and the channel B capacitive load resisting redundant circuit work independently, are compatible with inductive loads and capacitive loads, have the same working process, and are better suitable for the actual application environment of vehicles. The dual-channel capacitive load resistance redundant circuit is arranged to better realize different high-voltage control application requirements on auxiliary systems of vehicles such as a compressed air pump, DCDC, PTC and the like of an air conditioner and a pneumatic brake system in the vehicle; the service life of relay contacts for high-voltage control applications is better prolonged. Taking a channel A capacitive load resistance redundant circuit as an example, the channel A is additionally provided with a first relay normally open contact S2A and a first current limiting resistor RA which are 300 omega resistors on the basis of a typical capacitive load circuit, and an intelligent control module A is additionally provided. When an external control signal is given, the normally open contact S2A relay of the first relay is firstly closed, the capacitive load CA is charged by the 300 omega resistor through the first current limiting resistor RA, the time delay is hundreds of milliseconds, the voltage at the two ends of the power battery is similar to the voltage at the two ends of the capacitive load after the capacitive load capacitor is fully charged, the voltage difference between the contacts of the normally open contact S1A of the first relay is very low and even 0V, and at the moment, the normally open contact S1A of the first relay is closed again, so that the normally open contact S1A of the first relay is reliably and effectively ensured; after the first relay normally open contact S1A is closed, the a first relay normally open contact S2A is opened again. The normally open contact S2A of the first relay is closed and cut off without load in the whole closing process of the high-voltage direct-current relay, so that high voltage and current impact are not born between the contacts, only a mechanical blocking effect is achieved, and the service life of the normally open contact of the first relay is also reliably and effectively guaranteed. The normally open contact S1 of the first relay in the typical circuit has a large current when being closed each time, and a high-power relay is used to meet the use requirement, so that the cost, weight, volume and power consumption of the typical relay are correspondingly increased. The intelligent control module A and the intelligent control module B adopt two groups of intelligent control modules with the same control structure, wherein the intelligent control module A comprises a load starting control input signal, a bridge rectifier circuit, a voltage stabilizing circuit, an A first relay normally-open contact delay closing circuit and a first relay normally-open contact delay energizing circuit, wherein the load starting control input signal is electrically connected with the input end of the bridge rectifier circuit, the output end of the bridge rectifier circuit is electrically connected with the input end of the voltage stabilizing circuit, the rear stage of the voltage stabilizing circuit is electrically connected with the A first relay normally-open contact delay closing circuit, the rear stage of the A first relay normally-open contact delay closing circuit is electrically connected with the first relay normally-open contact delay energizing circuit, and the output end of the A first relay normally-open contact delay energizing circuit is electrically connected with the output end of the A first relay control coil. A first relay normally open contact time-delay closing circuit is formed by a first voltage comparator U2-1, a 21 st resistor R21, a 22 nd resistor R22, a 23 rd resistor R23, a 21 st capacitor C21 and a second N-channel MOS tube U4-2, wherein one end of the 21 st resistor R21 is connected with the 21 st capacitor C21 in series, the other end of the 21 st resistor R21 is electrically connected with a positive pole VCC12B of an output end of a voltage stabilizing circuit, one end of the 22 nd resistor R22 is connected with the 23 rd resistor R23 in series, the other end of the 22 nd resistor R22 is electrically connected with the positive pole VCC12B of the output end of the voltage stabilizing circuit, a series node of the 21 st resistor R21 and the 21 st capacitor C21 is electrically connected with a reverse input end-INA of the first comparator, a series node of the 22 nd resistor R22 and the 23 st resistor R23 is electrically connected with a positive input end +INA of the first comparator, an output end OUTA of the first comparator is electrically connected with a grid electrode input end CK3+ of the second N-channel MOS tube U4-2, and an output end of the second N-channel MOS tube is electrically connected with a drain electrode output end of the second relay PAD 4. A first relay normally open contact time-delay energizing circuit is composed of a second voltage comparator U2-2, a 24 th resistor R24, a 22 nd capacitor C22, a 22 nd resistor R22, a 23 rd resistor R23 and a first N-channel MOS tube U4-1, wherein one end of the 22 nd resistor R22 is connected with the 23 rd resistor R23 in series, the other end of the 22 nd resistor R22 is electrically connected with the positive electrode of the output end of the voltage stabilizing circuit, and a series node of the 22 nd resistor R22 and the 23 rd resistor R23 is electrically connected with the reverse input end-INA of the second comparator; one end of the 24 th resistor is connected with the 22 nd capacitor in series, the other end of the 24 th resistor is electrically connected with the positive electrode of the output end of the voltage stabilizing circuit, the series node of the 22 nd resistor and the 22 nd capacitor is electrically connected with the positive input end +INA (U2 pin 5) of the second comparator U2-2, the output end OUTB of the second comparator is electrically connected with the grid input end CK < 2+ > of the first N-channel MOS tube, and the drain output end of the first N-channel MOS tube is electrically connected with the output end PAD3 of the first relay control coil. The voltage stabilizing circuit is formed by jointly and electrically connecting a voltage-reducing voltage stabilizing chip U24 with the model LM2596-12, a 29 th capacitor C29, a 30 th capacitor C30, a 10 th voltage stabilizing diode D10 and a 3 rd inductor L3, wherein the 29 th capacitor C29 is connected in parallel with the input end of the voltage-reducing voltage stabilizing chip U24, the 30 th capacitor C30 is connected in parallel with the output end of the voltage-reducing voltage stabilizing chip U24, the 10 th voltage stabilizing diode D10 is connected in parallel with the output end of the voltage-reducing voltage stabilizing chip U24, the cathode of the 10 th voltage stabilizing diode D10 is electrically connected with the output end of the voltage-reducing voltage stabilizing chip U24, the 29 th capacitor C29 and the 30 th capacitor C30 are electrolytic capacitors, and the cathodes of the 29 th capacitor C29 and the 30 th capacitor C30 are electrically connected with the cathode of the voltage stabilizing circuit. The intelligent control module A and the intelligent control module B both adopt a double-voltage comparator U2 and a double-N-channel MOS tube U4, wherein the same double-voltage comparator and the double-N-channel MOS tube are used by the delay closing circuit of the normally open contact of the first relay A and the delay energizing circuit of the normally open contact of the first relay A. The bridge rectifier circuit adopts the 5 th rectifier diode D5, the 6 th rectifier diode D6, the 7 th rectifier diode D7 and the 8 th rectifier diode D8 to be electrically connected together to form the bridge rectifier circuit, the input end of the bridge rectifier circuit is electrically connected with the load starting control signal PDA1/PDA2, and the output end of the bridge rectifier circuit is electrically connected with the voltage stabilizing circuit. According to the characteristics of large instantaneous current and small storage capacity of the capacitive load capacitor, the instantaneous current of the capacitor is limited by the anti-capacitance component, so that the main relay is switched on and off at the position close to zero load, the instantaneous large current impact of the capacitive load when the main relay is switched on is effectively avoided, and meanwhile, the capacitive load capacitor can be compatible with resistive and inductive loads.
Example 2:
a capacitive load impact resistant double-path high-voltage control component closing control method comprises the following control processes:
a. after the load starting control signal receives the control electric signal, the second N-channel MOS transistor in the a intelligent control module described in embodiment 1 is turned on first, the a first relay in embodiment 1 is turned on first, and the normally open contact of the high-voltage dc relay of the a first relay is turned on first, so that the smaller circuit charges the first capacitive load;
b. after hundreds of milliseconds, the capacitive load is precharged to more than 80%, the first N-channel MOS tube of the embodiment 1 is conducted, and the normally open contact of the high-voltage direct-current relay of the first relay is closed close to 0 current;
c. after tens of milliseconds, the high-voltage direct-current relay of the second relay A is close to a 0-current shutoff contact;
in the control process, when the high-voltage direct-current relay normally-open contact of the first relay is closed firstly and charges capacitive load with small current through the current limiting resistor, the high-voltage direct-current relay normally-open contact of the first relay is not closed every time the control process is used; when the voltage difference between the two ends of the high-voltage direct-current relay contact of the first relay is almost zero volt after the voltage of the two ends of the capacitive load rises, the normally open contact of the high-voltage direct-current relay of the first relay is closed and does not bear the impact of large current.
According to the characteristics of large instantaneous current and small storage capacity of the capacitive load capacitor, the instantaneous current of the capacitor is limited by the anti-capacitance component, so that the main relay is switched on and off at the position close to zero load, the instantaneous large current impact of the capacitive load when the main relay is switched on is effectively avoided, and meanwhile, the capacitive load capacitor can be compatible with resistive and inductive loads.
The foregoing and construction describes the basic principles, principal features and advantages of the present application product, as will be appreciated by those skilled in the art. The foregoing examples and description are provided to illustrate the principles of the application and to provide various changes and modifications without departing from the spirit and scope of the application as defined by the appended claims. The scope of the application is defined by the appended claims and equivalents thereof.
Claims (8)
1. The utility model provides an anti capacitive load impact double-circuit high voltage control subassembly, includes anti appearance subassembly circuit, and anti appearance subassembly circuit adopts first relay, second relay, capacitive load and resistance load to make up and constitutes, and first relay normally open contact connects in parallel at power battery both ends after establishing ties with the capacitive load, and second relay normally open contact connects in parallel at power battery both ends after establishing ties with resistance load, its characterized in that: the intelligent control system comprises a first relay normally open contact, a first current limiting resistor, an intelligent control module A, a second relay normally open contact and a second current limiting resistor, wherein the first relay normally open contact is connected with the first current limiting resistor in series and then connected with the two ends of the first relay normally open contact in parallel; the intelligent control module B comprises a second relay control coil output end, a second relay control coil output end and a control signal input end of the intelligent control module B; when the capacitive load is charged with small current through the current limiting resistor, the normally open contact of the high-voltage direct-current relay of the first relay is not closed; when the voltage difference between the two ends of the high-voltage direct-current relay contact of the first relay is almost zero volt after the voltage of the two ends of the capacitive load rises, the normally open contact of the high-voltage direct-current relay of the first relay is closed and does not bear the impact of large current.
2. The capacitive load surge-resistant two-way high voltage control assembly of claim 1, wherein: the intelligent control module A and the intelligent control module B adopt two groups of intelligent control modules with the same control structure, the intelligent control module comprises a load starting control input signal, a bridge rectifier circuit, a voltage stabilizing circuit, an A first relay normally-open contact delay closing circuit and a first relay normally-open contact delay energizing circuit, wherein the load starting control input signal is electrically connected with the input end of the bridge rectifier circuit, the output end of the bridge rectifier circuit is electrically connected with the input end of the voltage stabilizing circuit, the rear stage of the voltage stabilizing circuit is electrically connected with the A first relay normally-open contact delay closing circuit, the rear stage of the A first relay normally-open contact delay closing circuit is electrically connected with the first relay normally-open contact delay energizing circuit, and the output end of the A first relay normally-open contact delay energizing circuit is electrically connected with the output end of the A first relay control coil.
3. The capacitive load surge-resistant two-way high voltage control assembly of claim 1, wherein: the first relay normally open contact time-delay closing circuit is composed of a first voltage comparator, a 21 st resistor, a 22 nd resistor, a 23 rd resistor, a 21 st capacitor and a second N-channel MOS tube, wherein one end of the 21 st resistor is connected with the 21 st capacitor in series, the other end of the 21 st resistor is electrically connected with the positive electrode of the output end of the voltage stabilizing circuit, one end of the 22 nd resistor is connected with the 23 rd resistor in series, the other end of the 22 nd resistor is electrically connected with the positive electrode of the output end of the voltage stabilizing circuit, a series node of the 21 st resistor and the 21 st capacitor is electrically connected with the reverse input end of the first comparator, a series node of the 22 nd resistor and the 23 rd resistor is electrically connected with the positive input end of the first comparator, the output end of the first comparator is electrically connected with the grid input end of the second N-channel MOS tube, and the drain output end of the second N-channel MOS tube is electrically connected with the output end of the first relay control coil.
4. A capacitive load surge-resistant two-way high voltage control assembly according to claim 3, wherein: the A first relay normally open contact time-delay energizing circuit is composed of a second voltage comparator, a 24 th resistor, a 22 nd capacitor, a 22 nd resistor, a 23 rd resistor and a first N-channel MOS tube, wherein one end of the 22 nd resistor is connected with the 23 rd resistor in series, the other end of the 22 nd resistor is electrically connected with the positive electrode of the output end of the voltage stabilizing circuit, and a series node of the 22 nd resistor and the 23 rd resistor is electrically connected with the reverse input end of the second comparator; one end of the 24 th resistor is connected with the 22 nd capacitor in series, the other end of the 24 th resistor is electrically connected with the positive electrode of the output end of the voltage stabilizing circuit, the serial connection node of the 22 nd resistor and the 22 nd capacitor is electrically connected with the positive input end of the second comparator, the output end of the second comparator is electrically connected with the input end of the grid electrode of the first N-channel MOS tube, and the output end of the drain electrode of the first N-channel MOS tube is electrically connected with the output end of the control coil of the first relay.
5. The capacitive load surge-resistant two-way high voltage control assembly of claim 2, wherein: the voltage stabilizing circuit is formed by jointly and electrically connecting a voltage-reducing voltage stabilizing chip with the model LM2596-12, a 29 th capacitor, a 30 th capacitor, a 10 th voltage stabilizing diode and a 3 rd inductor, wherein the 29 th capacitor is connected in parallel with the input end of the voltage-reducing voltage stabilizing chip, the 30 th capacitor is connected in parallel with the output end of the voltage-reducing voltage stabilizing chip, the 10 th voltage stabilizing diode is connected in parallel with the output end of the voltage-reducing voltage stabilizing chip, the cathode of the 10 th voltage stabilizing diode is electrically connected with the output end of the voltage-reducing voltage stabilizing chip, the 29 th capacitor and the 30 th capacitor are electrolytic capacitors, and the cathodes of the 29 th capacitor and the 30 th capacitor are electrically connected with the cathode of the voltage stabilizing circuit.
6. The capacitive load surge-resistant two-way high voltage control assembly of claim 1, wherein: the intelligent control module A and the intelligent control module B both adopt a double-voltage comparator and a double-N-channel MOS tube, wherein the same double-voltage comparator and the double-N-channel MOS tube are used by the normally-open contact time delay closing circuit of the first relay A and the normally-open contact time delay energizing circuit of the first relay A.
7. The capacitive load surge-resistant two-way high voltage control assembly of claim 2, wherein: the bridge rectifier circuit adopts the 5 th rectifier diode, the 6 th rectifier diode, the 7 th rectifier diode and the 8 th rectifier diode to be electrically connected together to form the bridge rectifier circuit, the input end of the bridge rectifier circuit is electrically connected with a load starting control signal, and the output end of the bridge rectifier circuit is electrically connected with the voltage stabilizing circuit.
8. A capacitive load impact resistant double-path high-voltage control component closing control method is characterized by comprising the following control processes of
a. When the load starting control signal receives a control electric signal, the second N-channel MOS tube in the A intelligent control module of claim 4 is firstly conducted, the A first relay of claim 4 is firstly closed, the normally open contact of the high-voltage direct-current relay of the A first relay is firstly closed, and the smaller circuit is used for charging the capacitive load;
b. after hundreds of milliseconds, the capacitive load is precharged to more than 80%, the first N-channel MOS tube of the claim 4 is conducted, and the normally open contact of the high-voltage direct-current relay of the first relay is closed close to 0 current;
c. after tens of milliseconds, the high-voltage direct-current relay of the second relay A is close to a 0-current shutoff contact;
in the control process, when the high-voltage direct-current relay normally-open contact of the first relay is closed firstly and charges capacitive load with small current through the current limiting resistor, the high-voltage direct-current relay normally-open contact of the first relay is not closed every time the control process is used; when the voltage difference between the two ends of the high-voltage direct-current relay contact of the first relay is almost zero volt after the voltage of the two ends of the capacitive load rises, the normally open contact of the high-voltage direct-current relay of the first relay is closed and does not bear the impact of large current.
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| CN109494688B (en) * | 2018-12-29 | 2020-06-30 | 中国原子能科学研究院 | Circuit for avoiding overcurrent protection during starting of battery pack |
| CN110824351B (en) * | 2019-11-20 | 2022-05-13 | 天津津航计算技术研究所 | Fault detection circuit and method for relay redundancy |
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