High-voltage wire connector rapid switching circuit system based on hot plug technology

Abstract

The utility model discloses a high-voltage wire connector rapid switching circuit system based on a hot plug technology, which comprises a power supply module, a power supply switching module used for monitoring a power supply state of the power supply module and automatically changing a power supply mode, and a buffer module used for reducing switching influence, the power supply module is electrically connected with the power supply switching module and the buffer module; according to the utility model, the hot plug control circuit constructed by adopting a TPS2490 chip is matched with the slow start units R1-R6 and Q1-Q4 formed by connecting a plurality of MOS tubes in parallel and the hierarchical capacitor arrays C7-C12, so that dynamic impedance matching during plugging of the standby power supply is realized. The slope change of bus voltage is monitored in real time through the hot-plug voltage detection circuit, power supply switching over-transition is completed on the premise of keeping the continuity of load power, relay contacts are protected by arranging the buffer module, the switching efficiency is improved by reducing interference, and the reliability of power supply switching is improved. Compared with a traditional arc extinguishing mode, the switching influence can be reduced while the power is not influenced.

Description

TECHNICAL FIELD

[0001] The utility model relates to high -voltage wiring device technical field, concretely is high -voltage wiring device quick switching circuit system based on hot plug technology. BACKGROUND

[0002] Hot plug technology is a technology that allows hardware devices to be inserted or removed during system operation without the need to shut down the power or restart the system. High-voltage wiring device is a device used to switch circuits in high-voltage power systems, such as circuit breakers, disconnectors, or load switches.

[0003] To optimize the circuit breaker switching circuit, some circuit breakers reduce the impact of load on switching by reducing the load current, thereby improving the efficiency of the switching circuit. After searching, a kind of AC / DC switching power supply circuit, method and circuit breaker are disclosed in the patent with the application publication number CN111525675A. The AC / DC switching power supply circuit includes a switching circuit, a power supply switch, an arc extinguishing circuit, an AC power input, a DC power input and a power output. When the switching circuit is controlled to conduct between the AC power input and the power supply switch, the arc extinguishing circuit is controlled to be disconnected from the power output, so that when the AC power input is connected to the power supply switch, the DC power supply is disconnected from the power output, thereby realizing AC power supply when the power supply switch is closed. When the DC power input and the power supply switch are controlled to be conducted, the arc extinguishing circuit and the power output are controlled to be conducted, so that the DC power supply is conducted with the power output, thereby realizing DC power supply when the power supply switch is closed. In this way, the AC power supply and the DC power supply are conveniently switched by only one switching circuit, and the power supply efficiency and reliability to the load are improved.

[0004] The circuit breaker switching circuit reduces the impact of load on switching by adding an arc extinguishing circuit, thereby improving switching efficiency. Although reducing the load current can reduce the arc damage of the relay contact and the energy loss during switching, it may affect the power requirement of the device. INVENTION CONTENTS

[0005] The utility model aims at providing high -voltage wiring device quick switching circuit system based on hot plug technology, through the relay control main power and spare power switching in power supply switching module and setting buffer module to the contact protection of relay, cooperates hot plug control circuit, can reduce the interference of spare power plug -in process to equipment, improves switching efficiency, can optimize switching effect without affecting power.

[0006] To achieve the above purpose, the utility model provides the following technical scheme: a power supply module, a power supply switching module for monitoring the power supply state of the power supply module and automatically changing the power supply mode, and a buffer module for reducing the switching impact, the power supply module is electrically connected with the power supply switching module and the buffer module.

[0007] The power supply module includes a main power supply, a backup power supply and a hot plug control circuit, the hot plug control circuit is electrically connected with the main power supply and the backup power supply, the hot plug control circuit includes a chip U1, the chip U1 adopts TPS2490 model, the chip U1 is externally electrically connected with a soft start circuit.

[0008] Preferably, the power supply switching module includes a relay, the coil of the relay is electrically connected with a voltage detection circuit, the normally closed contact of the relay is electrically connected with the backup power supply, the normally open contact of the relay is electrically connected with the main power supply, and the other end of the relay is connected with a load.

[0009] Preferably, the voltage detection circuit includes an LM393 comparator, the negative input end of the LM393 comparator is connected with a resistor R51 and a resistor R52, the first pin of the LM393 comparator is connected with a resistor R55 and a resistor R56, one end of the resistor R56 is connected with an optocoupler U2, the fourth pin of the optocoupler U2 is connected with a resistor R14, the seventh pin of the LM393 comparator is connected with an optocoupler U3, and the optocoupler U2 and the optocoupler U3 adopt EL357N model.

[0010] Preferably, the soft start circuit includes a resistor R1, a resistor R2, a resistor R3, a resistor R4 and a resistor R5, one end of the resistor R1, the resistor R2, the resistor R3, the resistor R4 and the resistor R5 is electrically connected with the tenth pin of the chip U1, a resistor R6 is connected between the resistor R4 and the resistor R5, one end of the resistor R6 is connected with the ninth pin of the chip U1, a MOS tube Q1, a MOS tube Q2, a MOS tube Q3 and a MOS tube Q4 are connected between the resistor R1 and the resistor R4, and the MOS tube Q1, the MOS tube Q2, the MOS tube Q3 and the MOS tube Q4 are connected with a capacitor circuit in parallel.

[0011] Preferably, the capacitor circuit includes a capacitor C7, a capacitor C8, a capacitor C9, a capacitor C10, a capacitor C11 and a capacitor C12, the capacitor C7, the capacitor C8 and the capacitor C9 are connected in parallel, and the capacitor C10, the capacitor C11 and the capacitor C12 are connected in parallel.

[0012] Preferably, the buffer module includes a triode Q4, the collector of the triode Q4 is connected with the third pin of the relay, and a pressure sensitive resistor RV1 is connected between the first pin and the second pin of the relay.

[0013] Preferably, the main power supply includes an input interface for receiving external AC power input, a rectification conversion filtering module for converting AC power into DC power and adjusting voltage level, the relay is electrically connected with the input interface, and the input interface is electrically connected with the rectification conversion filtering module.

[0014] The standby power supply comprises an energy storage module for storing direct current power, an inverter for converting direct current of the battery into alternating current for alternating current load, and the power supply switching module is electrically connected with the energy storage module and the inverter.

[0015] Compared with the prior art, the utility model has the advantages that:

[0016] The utility model discloses a hot plug control circuit that is built by adopting TPS2490 chip, and is matched with the slow start unit R1-R6, Q1-Q4 and the grading capacitor array C7-C12 that are formed by the parallel connection of multiple MOS tubes, and dynamic impedance matching when the standby power supply is plugged is realized. The voltage detection circuit of hot plug monitors the slope change of bus voltage in real time, and under the premise of maintaining the continuity of load power, the power supply switching transition is completed, the relay contact is protected through the setting buffer module, the switching efficiency is improved through the reduction of interference, and compared with the traditional arc extinguishing mode, the switching influence can be reduced without affecting the power. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is the system diagram of the utility model;

[0018] Figure 2 It is the circuit structure diagram of the slow start circuit of the utility model;

[0019] Figure 3 It is the circuit structure diagram of the capacitor circuit in the slow start circuit of the utility model;

[0020] Figure 4 It is the circuit structure schematic diagram of the voltage detection circuit of the utility model;

[0021] Figure 5 It is the circuit structure schematic diagram of the buffer module of the utility model. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0023] Please refer to Figures 1-5 The utility model provides a technical scheme: including power supply module, the power supply switching module for monitoring power supply module power state and automatic change power supply mode and the buffer module for reducing switching influence, the power supply module is electrically connected with power supply switching module and buffer module;

[0024] The power supply module comprises a main power supply, a backup power supply and a hot plug control circuit, the hot plug control circuit is electrically connected with the main power supply and the backup power supply, the hot plug control circuit comprises a chip U1, the chip U1 adopts a TPS2490 model, and the chip U1 is externally electrically connected with a soft start circuit.

[0025] The chip TPS2490 supports hot plug power management, realizes current limiting and soft start function through controlling an external MOSFET, and prevents surge current from damaging the circuit in the instant of plugging. The soft start circuit is connected in parallel with a resistor and a MOS network to gradually turn on the power supply path, and is connected with a parallel capacitor group for filtering and suppressing voltage mutation.

[0026] The power supply switching module comprises a relay, a voltage detection circuit is electrically connected with the coil of the relay, the normally closed contact of the relay is electrically connected with the backup power supply, the normally open contact of the relay is electrically connected with the main power supply, and the other end of the relay is connected with a load.

[0027] When the main power supply is normal, the relay coil is powered by the voltage detection circuit, the normally open contact is attracted, and the main power supply is powered; when the main power supply is abnormal, the coil loses power, the relay rebounds to the normally closed contact, and the backup power supply takes over.

[0028] The voltage detection circuit comprises an LM393 comparator, a resistor R51 and a resistor R52 are connected to the negative input end of the LM393 comparator, a resistor R55 and a resistor R56 are connected to the first pin of the LM393 comparator, one end of the resistor R56 is connected to a photoelectric coupler U2, the fourth pin of the photoelectric coupler U2 is connected to a resistor R14, the seventh pin of the LM393 comparator is connected to a photoelectric coupler U3, and the photoelectric couplers U2 and U3 adopt an EL357N model.

[0029] The LM393 comparator monitors the main power supply voltage and the set threshold value through the voltage dividing resistors R51 and R52. When the voltage is lower than the threshold value, a low level is output to trigger the photoelectric couplers U2 and U3. The EL357N photoelectric coupler isolates high and low voltage sides, enhances anti-interference ability, and drives the relay coil.

[0030] The soft start circuit comprises resistors R1, R2, R3, R4 and R5, one end of each of the resistors R1, R2, R3, R4 and R5 is electrically connected with the tenth pin of the chip U1, a resistor R6 is connected between the resistors R4 and R5, one end of the resistor R6 is connected to the ninth pin of the chip U1, MOS transistors Q1, Q2, Q3 and Q4 are connected between the resistors R1 and R4, and a capacitor circuit is connected to the parallel connection of the MOS transistors Q1, Q2, Q3 and Q4.

[0031] MOS tube Q4 as the driving switch of the relay coil, controls the on-off timing of the coil, reduces the contact jitter. The resistance network resistors R1, R2, R3, R4 and R5, R6 adjust the gate voltage of the MOS tube, control the conduction speed, and realize soft start; The capacitor group capacitors C7, C8, C9, C10, C11 and C12 are connected in parallel to reduce ESR, provide transient current capacity, and smooth the starting voltage waveform.

[0032] The capacitor circuit includes capacitors C7, C8, C9, C10, C11 and C12, the capacitors C7, C8 and C9 are connected in parallel, and the capacitors C10, C11 and C12 are connected in parallel.

[0033] Capacitors C7, C8 and C9 are connected in parallel for high-frequency filtering to suppress high-frequency noise of the main power supply; Capacitors C10, C11 and C12 are connected in parallel to realize low-frequency energy storage and meet the instantaneous power demand when the load suddenly changes.

[0034] The buffer module includes a triode Q4, the collector of the triode Q4 is connected with the third pin of the relay, and the first pin and the second pin of the relay are connected with a pressure sensitive resistor RV1.

[0035] By setting the pressure sensitive resistor RV1 in parallel with the relay contact, the voltage peak and arc energy at the switching moment are absorbed, and the contact is protected from ablation.

[0036] The main power supply includes an input interface responsible for receiving external power AC input, a rectification conversion filtering module for converting AC to DC and adjusting voltage level, the relay is electrically connected with the input interface, and the input interface is electrically connected with the rectification conversion filtering module.

[0037] The backup power supply includes an energy storage module for storing DC power, an inverter for converting the DC power of the battery into AC power for AC load use, and the power supply switching module is electrically connected with the energy storage module and the inverter.

[0038] The main power supply receives AC power through the input interface, and converts it into stable DC power through rectification, filtering, voltage reduction / boosting, to provide main power for the system. The backup power supply stores DC power in the energy storage module, and the inverter converts DC into AC for AC load use, realizing dual power backup.

[0039] In use, the slope change of the bus voltage is monitored in real time by the hot plug voltage detection circuit, when the main power is normal, the relay coil is powered by the voltage detection circuit, the normally open contact is attracted, and the main power supply is powered; when the main power is abnormal, the coil loses power, the relay rebounds to the normally closed contact, the standby power supply takes over, during the switching process, the resistors R1, R2, R3, R4 and R5, R6 adjust the gate voltage of the MOS tube, control the conduction speed, realize soft start; the capacitor group capacitors C7, C8, C9, C10, C11 and C12 are connected in parallel to reduce ESR, provide instantaneous large current capacity, at the same time smooth the starting voltage waveform, reduce the influence in the switching process of the circuit, complete the power supply switching transition, the voltage peak and arc energy in the switching moment are absorbed by the pressure sensitive resistor RV1 connected in parallel at both ends of the relay contact, the contact is protected from ablation, the switching efficiency is improved by reducing the contact interference, compared with the traditional arc extinguishing mode, the switching influence can be reduced without affecting the power.

[0040] Although the embodiments of the present application have been shown and described, it is to be understood that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. High voltage connector quick switching circuitry based on hot plug technology, characterized in that: The power supply module is electrically connected with the power supply switching module and the buffer module, and comprises a main power supply, a backup power supply and a hot plug control circuit. The power supply module comprises a main power supply, a backup power supply and a hot plug control circuit, the hot plug control circuit is electrically connected with the main power supply and the backup power supply, and the hot plug control circuit comprises a chip U1.

2. Hot plug technology based high voltage connector quick switch circuitry according to claim 1, characterized in that: The power supply switching module comprises a relay, the coil of the relay is electrically connected with a voltage detection circuit, the normally closed contact of the relay is electrically connected with the backup power supply, the normally open contact of the relay is electrically connected with the main power supply, and the other end of the relay is connected with a load.

3. Hot plug technology based high voltage connector quick switch circuitry according to claim 2, characterized in that: The voltage detection circuit comprises an LM393 comparator, the negative input end of the LM393 comparator is connected with resistors R51 and R52, the first pin of the LM393 comparator is connected with resistors R55 and R56, one end of the resistor R56 is connected with a photoelectric coupler U2, the fourth pin of the photoelectric coupler U2 is connected with a resistor R14, the seventh pin of the LM393 comparator is connected with a photoelectric coupler U3, and the photoelectric coupler U2 and the photoelectric coupler U3 are both of EL357N type.

4. Hot plug technology based high voltage connector quick switch circuitry according to claim 3, characterized in that: The buffer module comprises a triode Q4, the collector of the triode Q4 is connected with the third pin of the relay, and the first pin and the second pin of the relay are connected with a piezoresistance RV1.

5. Hot plug technology based high voltage connector quick switch circuitry according to claim 4, characterized in that: The main power supply comprises an input interface for receiving external AC power input, a rectification conversion filter module for converting AC power into DC power and adjusting the voltage level, the relay is electrically connected with the input interface, and the input interface is electrically connected with the rectification conversion filter module.

6. Hot plug technology based high voltage connector quick switch circuitry according to claim 5, characterized in that: The backup power supply comprises an energy storage module for storing DC power, and an inverter for converting DC power of the battery into AC power for AC load, and the power supply switching module is electrically connected with the energy storage module and the inverter.

7. Hot plug technology based high voltage connector quick switch circuitry according to claim 6, characterized in that: ​ ​

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