CN210111684U

CN210111684U - Zero-interruption hybrid dual-power automatic conversion device

Info

Publication number: CN210111684U
Application number: CN201920778347.7U
Authority: CN
Inventors: 柏华东; 戴水东; 李月军; 简美加; 徐君芳
Original assignee: Hangzhou Zhijiang Switchgear Stock Co Ltd
Current assignee: Hangzhou Zhijiang Switchgear Stock Co Ltd
Priority date: 2019-05-28
Filing date: 2019-05-28
Publication date: 2020-02-21
Anticipated expiration: 2029-05-28

Abstract

The utility model discloses a zero-interruption hybrid dual-power automatic conversion device, including the conversion equipment body, this internal excitation change over switch and the master control ware of being equipped with of conversion equipment, ADC sampling module and IGBT drive output module are equipped with on the master control ware, excitation change over switch's input is connected with main power supply circuit L1 and stand-by power supply circuit L2 respectively, excitation change over switch's input is connected through the generating line with load circuit, the other contravariant power unit that is incorporated into the power networks that is equipped with of excitation change over switch, contravariant power unit's input and output are connected with main power supply circuit L1 and load circuit respectively, excitation change over switch's control end is connected with master control ware's signal output part. The utility model overcomes the problem that transient power failure can appear in traditional change over switch load when the circuit conversion. The utility model has the advantages of continuity and stationarity are better when withstand voltage level and insulation level are higher and the power supply.

Description

Zero-interruption hybrid dual-power automatic conversion device

Technical Field

The utility model relates to a power change-over switch field, more specifically say, relate to a zero-interruption hybrid dual supply automatic switching device.

Background

With the further development of economic technology, the requirements of power consumers on the continuity and reliability of a power supply system are continuously improved, and very serious consequences can be caused if power supply interruption occurs for power supply of sensitive loads, such as medical power supply, military power supply, fire power supply, data center, power supply of large-scale activity places and the like. In general, the sensitive load needs to be powered by two mutually independent power supplies, so that the power supply continuity of the sensitive load can be ensured.

At present, a great deal of mechanical automatic transfer switch equipment adopted in alternating current transmission is used as a switching device of two power supply sources, although the advantages of the mechanical automatic transfer switch equipment are obvious, the conduction is stable, and the load capacity is strong. But its shortcoming also becomes more and more prominent with the improvement of user's requirement for power supply quality, mainly summarized as follows: a. the conversion action time of the mechanical contact is long, real-time, flexible, continuous and quick action cannot be provided, the load power supply is easily interrupted, the accident is enlarged, and the system stability is damaged; b. when the load is disconnected, electric arcs are often generated, the contact is easy to burn, and meanwhile, the disconnection time is prolonged; c. the contact can also vibrate when closing a switch, the power supply continuity is influenced, power noise is easily generated, the contact abrasion is accelerated, the electrical service life of the change-over switch is limited, and the like.

In addition, solid-state transfer switches and composite transfer switches are available on the world at present, wherein the solid-state transfer switches mainly switch the main power supply and the standby power supply through the electronic switches, although the conversion speed is fast, the conducting parts of the existing pure electronic switches have excessive residual voltage, so that the devices are excessively high in loss and low in power supply efficiency during normal operation, and a large cooling system needs to be configured. The composite change-over switch is based on a mechanical switch, a power electronic device is used as a contact of the electronic switch and the mechanical switch to be connected in parallel, the mechanical switch bears a steady-state process, the electronic switch part solves a dynamic process of the switch, and the advantages of the electronic switch and the mechanical switch are complementary. Compared with a purely mechanical switch, the electronic switch component is only switched on for power supply at the moment of switching on and off, almost no loss is generated at ordinary times, the switching speed of the change-over switch is greatly increased, and the continuity requirement of power supply is improved. However, the disadvantages are described below: a. because the electronic switch connected in parallel between the main and standby power supplies belongs to a semiconductor device, the insulation and voltage resistance grades of the main and standby power supplies are greatly reduced, and certain risks exist. b. In the process of conversion, the risk that two paths of power supplies are conducted to a load through the electronic switch at the same time may occur, and if the phase difference of the main power supply and the standby power supply is large or the potential difference is large, the problem of short circuit of the main power supply and the standby power supply may occur, so that the electronic switch is damaged, and the reliability of power supply is influenced.

SUMMERY OF THE UTILITY MODEL

The utility model discloses an overcome above-mentioned various technical problem, now provide have the conversion nimble quick, switch on stable, take that load capacity is strong, electric life is high, electrical insulation and withstand voltage level are high, fully guarantee to the reliability of load power supply and advantage such as continuity zero break hybrid dual supply automatic switching device.

The utility model discloses a zero-interruption hybrid dual-power automatic conversion device, which comprises a conversion device body, the conversion device body in be equipped with excitation change-over switch and master control ware, master control ware on be equipped with ADC sampling module and IGBT drive output module, excitation change-over switch's input be connected with main power supply circuit L1 and stand-by power supply circuit L2 respectively, excitation change-over switch's input be connected through the generating line with load circuit, excitation change-over switch side be equipped with contravariant grid-connected power supply unit, contravariant grid-connected power supply unit's input and output be connected with main power supply circuit L1 and load circuit respectively, excitation change-over switch's control end be connected with master control ware's signal output part, main power supply circuit L1 and stand-by power supply circuit L2 be connected through the sampling wire with ADC sampling module respectively, the current sampling end of the inversion grid-connected power supply unit is connected with the ADC sampling module through a sampling wire, and the bus is connected with the ADC sampling module through the sampling wire.

The excitation change-over switch is mainly responsible for automatic switching of power supply of the main power supply circuit L1 and the standby power supply circuit L2 and maintaining steady-state power supply, and the quick switching of the power supply is realized by utilizing the excitation action characteristic of the excitation change-over switch; and the physical characteristics of the mechanical contact of the excitation change-over switch are utilized to realize the stability and the strong loading capacity characteristic when the circuit is conducted.

The during operation, the utility model discloses can carry out main power supply circuit L1 and stand-by power supply circuit L2's genlock according to main contact put-through position, realize the short-time contravariant and be incorporated into the power networks the power supply in excitation change over switch's main contact conversion process, compensate the phenomenon that excitation change over switch main contact switches the transient state in-process and supply power to the load and break off to guarantee the continuity and the stationarity of load power supply.

The phase locking and short-time grid-connected power supply functions of the inversion grid-connected power supply unit can ensure that the main contact of the excitation switch is cut off after the main contact is completely switched on, the arc discharge phenomenon caused by repeated oscillation in the switching-on process of the contact is completely avoided, and the electric service life of the contact is prolonged.

The during operation, the contravariant be incorporated into the power networks the isolation among the power supply unit and send the part, can utilize high frequency transformer's electromagnetic coupling characteristic to realize the electric energy transmission and with the electrical isolation of load end, thereby improve the utility model discloses a withstand voltage level and insulation level.

The inversion grid-connected power supply unit only needs to maintain inversion power supply in the conversion process of the excitation type change-over switch, does not need to be put into an operation state for a long time, saves a cooling system required by long-time operation, and therefore the requirement of reducing the size is met, and meanwhile the static loss of the whole device is reduced.

Preferably, a molded case circuit breaker M6 is respectively provided between the main power supply circuit L1 and the standby power supply circuit L2 and the excitation type change-over switch, and a miniature circuit breaker M9 is provided between the main power supply circuit L1 and the inversion grid-connected power supply unit.

The molded case circuit breaker M6 is used for protecting a main power supply circuit L1 and a standby power supply circuit L2, and the miniature circuit breaker M9 is used for protecting an inversion grid-connected power supply unit.

Preferably, the power circuit L1 includes a live wire LA, a live wire LB, a live wire LC and a neutral wire N, the inverter grid-connected power unit includes an isolation transformer and a rectification inverter, the isolation transformer includes a three-phase PFC control unit and a full-bridge DC/DC conversion unit, the three-phase PFC control unit includes an inductor LA, an inductor LB, an inductor LC, a diode D1, a diode D2, a diode D3, a diode D4, a diode D5, a diode D6, a diode D11, a diode D11, an N-MOS transistor M1, an N-MOS transistor M2, a capacitor C1, a capacitor C2, a resistor R1, a resistor R2, and a three-phase PFC modulation controller, one end of the inductor LA is respectively connected to an anode of the diode D1 and a cathode of the diode D4, the other end of the inductor LA is connected to the live wire LA, and the other end of the live wire LB is connected to the live wire LB, the other end of the inductor Lc is connected with a live wire LC, one end of the inductor Lb is respectively connected with the anode of a diode D2 and the cathode of a diode D5, one end of the inductor Lc is respectively connected with the anode of a diode D3 and the cathode of a diode D6, the grid of the N-MOS tube M1 and the grid of the N-MOS tube M2 are respectively connected with the input end of a three-phase PFC modulation controller, the voltage feedback end of the three-phase PFC modulation controller is connected with one end of a resistor R1, the drains of the diode D1, the diode D2, the diode D3 and the N-MOS tube M1 are respectively connected with the anode of a diode D12, the drains of the diode D4, the diode D5, the diode D6 and the N-MOS tube M2 are respectively connected with the cathode of a diode D11, the cathode of the diode D12 and one end of a capacitor C1 are respectively connected with one end of a resistor R1, the anode of the diode D11 and one end of the capacitor C2 are respectively connected with one end of a resistor R2, and the other end of the resistor R1, the other end of the resistor R2, the other end of the capacitor C1, the other end of the capacitor C2, the source of the N-MOS tube M1 and the drain of the N-MOS tube M2 are respectively connected with a zero line N.

Three-phase PFC the control unit be used for the rectifier circuit to improve the utility model discloses an interference killing feature.

Preferably, the full-bridge DC/DC conversion unit includes an SPWM modulation controller, a transistor Q1, a transistor Q2, a transistor Q3, a transistor Q4, a diode D7, a diode D8, a diode D9, a diode D10, a diode D13, a diode D14, a diode D15, a diode D16, a capacitor C3, a capacitor C4, a capacitor C5, a capacitor C6, a capacitor C7, a capacitor C8, a capacitor C9, a capacitor C10, an inductor L1, and a high frequency transformer, wherein a collector of the transistor Q1, a cathode of the diode D13, a collector of the transistor Q2, and a cathode of the diode D14 are respectively connected to a cathode of the diode D12, an emitter of the transistor Q3, an anode of the diode D15, an emitter of the transistor Q4, and an anode of the diode D16 are respectively connected to an anode of the diode D11, a base of the transistor Q1 is connected to the SPWM modulator, a base of the SPWM controller 2, the base electrode of the triode Q3 is connected with an SPWM modulation controller, the base electrode of the triode Q4 is connected with the SPWM modulation controller, the emitter electrode of the triode Q1 and the collector electrode of the triode Q3 are respectively connected with a pin 1 of a high-frequency transformer, the emitter electrode of the triode Q2 and the collector electrode of the triode Q4 are respectively connected with a pin 2 of the high-frequency transformer, the cathode of the diode D7 and the cathode of the diode D8 are respectively connected with one end of an inductor L1, the cathode of the diode D9 and the anode of the diode D7 are respectively connected with a pin 3 of the high-frequency transformer, the anode of the diode D8 and the cathode of the diode D10 are respectively connected with a pin 4 of the high-frequency transformer, one end of the capacitor C3, one end of the capacitor C4, one end of the capacitor C5 and one end of the capacitor C6 are respectively connected with the other end of the inductor L1, the anode of the diode D9, the anode of the diode D10, one end of the capacitor C7, one end of the capacitor C8 and one end of the capacitor C9 are respectively connected with one end of a capacitor C10, the other end of the capacitor C3, the other end of the capacitor C4, the other end of the capacitor C5, the other end of the capacitor C6, the other end of the capacitor C7, the other end of the capacitor C8 and the other end of the capacitor C9 are respectively connected with the other end of a capacitor C10, and the capacitor C3, the capacitor C4, the capacitor C5, the capacitor C6, the capacitor C7, the capacitor C8, the capacitor C9 and the capacitor C10 form a charging unit.

High frequency transformer be used for keeping apart full bridge type DC/DC converting unit's inlet wire end and leading-out terminal, strengthen the utility model discloses an interference killing feature improves the utility model discloses a stability.

Preferably, the rectifying and inverting component comprises a power frequency rectifying component and an inverting and grid-connected component, the power frequency rectifying component comprises a driver J1, a driver J2, a driver J3, a transistor Q5, a transistor Q6, a transistor Q7, a transistor Q8, a transistor Q9, a transistor Q10, a diode D17, a diode D18, a diode D19, a diode D20, a diode D21 and a diode D22, the input end of the driver J1, the input end of the driver J2 and the input end of the driver J3 are respectively connected with the IGBT driving output module, the base of the transistor Q5 and the base of the transistor Q8 are respectively connected with the output end of the driver J1, the base of the transistor Q8 and the base of the transistor Q9 are respectively connected with the output end of the driver J2, the base of the transistor Q7 and the base of the transistor Q10 are respectively connected with the output end of the driver J3, and the collector of the transistor Q5 is respectively connected with, The cathode of the diode D17, the collector of the transistor Q6, the cathode of the diode D18, the collector of the transistor Q7 and the cathode of the diode D19 are respectively connected to the other end of the inductor L1, the emitter of the transistor Q5, the anode of the diode D17 and the collector of the transistor Q8 are respectively connected to the cathode of the diode D20, the emitter of the transistor Q6, the anode of the diode D18 and the collector of the transistor Q9 are respectively connected to the cathode of the diode D21, the emitter of the transistor Q7, the anode of the diode D19 and the collector of the transistor Q10 are respectively connected to the cathode of the diode D22, and the emitter of the transistor Q8, the anode of the diode D20, the emitter of the transistor Q9, the anode of the diode D21, the emitter of the transistor Q10 and the anode of the diode D22 are respectively connected to the anode of the diode D10.

Preferably, the inversion grid-connected component comprises a reactor, a current sampler, a capacitor C11, a capacitor C12, a capacitor C13 and a grid-connected contactor, the current sampler is provided with a current transformer CT1, a current transformer CT2 and a current transformer CT3, pins 5, 6 and 7 of the reactor are respectively connected with an emitter of a triode Q5, an emitter of a triode Q6 and an emitter of a triode Q7, a pin 8 of the reactor is connected with the other end of the capacitor C3,

pins

1, 2 and 3 of the reactor are respectively connected with an input end of the current transformer CT1, an input end of the current transformer CT2 and an input end of the current transformer CT3, an output end of the current transformer CT1 and one end of the capacitor C11 are respectively connected with a pin 1 of the grid-connected contactor, an output end of the current transformer CT2 and one end of the capacitor C12 are respectively connected with a pin 2 of the grid-connected contactor, the output end of the current transformer CT3 and one end of the capacitor C13 are respectively connected with a pin 3 of the grid-connected contactor, the other end of the reactor 4, the other end of the capacitor C11, the other end of the capacitor C12 and the other end of the capacitor C13 are respectively connected with a pin 4 of the grid-connected contactor, and a pin 5 of the grid-connected contactor is connected with a bus.

The reactor be used for improving the utility model discloses an interference killing feature.

The utility model discloses following beneficial effect has: the static loss is low; the voltage-resistant grade and the insulating grade are higher; the service life is longer; the continuity and the stationarity are better when the power is supplied.

Drawings

Fig. 1 is a specific circuit diagram of the present invention.

Fig. 2 is a schematic circuit diagram of a three-phase PFC control unit according to the present invention.

Fig. 3 is a schematic circuit diagram of the full-bridge DC/DC conversion unit according to the present invention.

Fig. 4 is a schematic circuit diagram of the charging unit of the present invention.

Fig. 5 is a circuit diagram of the inverter grid-connected component of the present invention.

Detailed Description

The technical solution of the present invention is further specifically described below by way of examples and with reference to the accompanying drawings.

Example (b): the present invention is further explained with reference to fig. 1, fig. 2, fig. 3, fig. 4 and fig. 5, in which the present invention includes a converter body, an excitation transfer switch and a main controller are disposed in the converter body, an ADC sampling module and an IGBT driving output module are mounted on the main controller, an input end of the excitation transfer switch is respectively connected to a main power circuit L1 and a standby power circuit L2, an input end of the excitation transfer switch is connected to a load circuit via a bus, an inversion grid-connected power unit is disposed beside the excitation transfer switch, an input end and an output end of the inversion grid-connected power unit are respectively connected to the main power circuit L1 and the load circuit, a control end of the excitation transfer switch is connected to a signal output end of the main controller, the main power supply circuit L1 and the standby power supply circuit L2 are respectively connected with the ADC sampling module through sampling wires, the current sampling end of the inversion grid-connected power supply unit is connected with the ADC sampling module through the sampling wires, and the bus is connected with the ADC sampling module through the sampling wires.

A plastic shell breaker M6 is respectively arranged between the main power supply circuit L1 and the standby power supply circuit L2 and the excitation type change-over switch, and a miniature breaker M9 is arranged between the main power supply circuit L1 and the inversion grid-connected power supply unit.

The power circuit L1 comprises a live wire LA, a live wire LB, a live wire LC and a zero wire N, the inverter grid-connected power unit comprises an isolation transmitting component and a rectification inverting component, the isolation transmitting component comprises a three-phase PFC control unit and a full-bridge DC/DC conversion unit, the three-phase PFC control unit comprises an inductor La, an inductor Lb, an inductor LC, a diode D1, a diode D2, a diode D3, a diode D4, a diode D5, a diode D6, a diode D11, a diode D11, an N-MOS tube M1, an N-MOS tube M2, a capacitor C1, a capacitor C2, a resistor R1, a resistor R2 and a three-phase PFC modulation controller, one end of the inductor La is respectively connected with the anode of the diode D1 and the cathode of the diode D4, the other end of the inductor La is connected with the live wire inductor LA, and the other end of the live wire Lb is connected with the live wire LB, the other end of the inductor Lc is connected with a live wire LC, one end of the inductor Lb is respectively connected with the anode of a diode D2 and the cathode of a diode D5, one end of the inductor Lc is respectively connected with the anode of a diode D3 and the cathode of a diode D6, the grid of the N-MOS tube M1 and the grid of the N-MOS tube M2 are respectively connected with the input end of a three-phase PFC modulation controller, the voltage feedback end of the three-phase PFC modulation controller is connected with one end of a resistor R1, the drains of the diode D1, the diode D2, the diode D3 and the N-MOS tube M1 are respectively connected with the anode of a diode D12, the drains of the diode D4, the diode D5, the diode D6 and the N-MOS tube M2 are respectively connected with the cathode of a diode D11, the cathode of the diode D12 and one end of a capacitor C1 are respectively connected with one end of a resistor R1, the anode of the diode D11 and one end of the capacitor C2 are respectively connected with one end of a resistor R2, and the other end of the resistor R1, the other end of the resistor R2, the other end of the capacitor C1, the other end of the capacitor C2, the source of the N-MOS tube M1 and the drain of the N-MOS tube M2 are respectively connected with a zero line N.

The full-bridge DC/DC conversion unit comprises an SPWM modulation controller, a transistor Q1, a transistor Q2, a transistor Q3, a transistor Q4, a diode D7, a diode D8, a diode D9, a diode D10, a diode D13, a diode D14, a diode D15, a diode D16, a capacitor C3, a capacitor C4, a capacitor C5, a capacitor C6, a capacitor C7, a capacitor C8, a capacitor C9, a capacitor C10, an inductor L1 and a high-frequency transformer, wherein a collector of the transistor Q1, a cathode of the diode D13, a collector of the transistor Q2 and a cathode of the diode D14 are respectively connected with a cathode of the diode D12, an emitter of the transistor Q3, an anode of the diode D15, an emitter of the transistor Q4 and an anode of the diode D16 are respectively connected with an anode of a diode D11, a base of the SPWM modulator Q1 and a base of the SPWM controller is connected with the SPWM Q2, the base electrode of the triode Q3 is connected with an SPWM modulation controller, the base electrode of the triode Q4 is connected with the SPWM modulation controller, the emitter electrode of the triode Q1 and the collector electrode of the triode Q3 are respectively connected with a pin 1 of a high-frequency transformer, the emitter electrode of the triode Q2 and the collector electrode of the triode Q4 are respectively connected with a pin 2 of the high-frequency transformer, the cathode of the diode D7 and the cathode of the diode D8 are respectively connected with one end of an inductor L1, the cathode of the diode D9 and the anode of the diode D7 are respectively connected with a pin 3 of the high-frequency transformer, the anode of the diode D8 and the cathode of the diode D10 are respectively connected with a pin 4 of the high-frequency transformer, one end of the capacitor C3, one end of the capacitor C4, one end of the capacitor C5 and one end of the capacitor C6 are respectively connected with the other end of the inductor L1, the anode of the diode D9, the anode of the diode D10, one end of the capacitor C7, one end of the capacitor C8 and one end of the capacitor C9 are respectively connected with one end of a capacitor C10, the other end of the capacitor C3, the other end of the capacitor C4, the other end of the capacitor C5, the other end of the capacitor C6, the other end of the capacitor C7, the other end of the capacitor C8 and the other end of the capacitor C9 are respectively connected with the other end of a capacitor C10, and the capacitor C3, the capacitor C4, the capacitor C5, the capacitor C6, the capacitor C7, the capacitor C8, the capacitor C9 and the capacitor C10 form a charging unit.

The rectifying and inverting component comprises a power frequency integral component and an inverting grid-connected component, the power frequency integral component comprises a driver J1, a driver J2, a driver J3, a triode Q5, a triode Q6, a triode Q7, a triode Q8, a triode Q9, a triode Q10, a diode D17, a diode D18, a diode D19, a diode D20, a diode D21 and a diode D22, the input end of the driver J1, the input end of the driver J2 and the input end of the driver J3 are respectively connected with an IGBT driving output module, the base of the triode Q5 and the base of the triode Q8 are respectively connected with the output end of the driver J1, the base of the triode Q8 and the base of the triode Q9 are respectively connected with the output end of the driver J2, the base of the triode Q7 and the base of the triode Q10 are respectively connected with the output end of the driver J3, and the collector of the triode Q5 is respectively connected with, The cathode of the diode D17, the collector of the transistor Q6, the cathode of the diode D18, the collector of the transistor Q7 and the cathode of the diode D19 are respectively connected to the other end of the inductor L1, the emitter of the transistor Q5, the anode of the diode D17 and the collector of the transistor Q8 are respectively connected to the cathode of the diode D20, the emitter of the transistor Q6, the anode of the diode D18 and the collector of the transistor Q9 are respectively connected to the cathode of the diode D21, the emitter of the transistor Q7, the anode of the diode D19 and the collector of the transistor Q10 are respectively connected to the cathode of the diode D22, and the emitter of the transistor Q8, the anode of the diode D20, the emitter of the transistor Q9, the anode of the diode D21, the emitter of the transistor Q10 and the anode of the diode D22 are respectively connected to the anode of the diode D10.

The inversion grid-connected component comprises an electric reactor, a current sampler, a capacitor C11, a capacitor C12, a capacitor C13 and a grid-connected contactor, wherein the current sampler is provided with a current transformer CT1, a current transformer CT2 and a current transformer CT3, pins 5, 6 and 7 of the electric reactor are respectively connected with an emitter of a triode Q5, an emitter of a triode Q6 and an emitter of a triode Q7, a pin 8 of the electric reactor is connected with the other end of the capacitor C3,

pins

1, 2 and 3 of the electric reactor are respectively connected with an input end of the current transformer CT1, an input end of the current transformer CT2 and an input end of the current transformer CT3, an output end of the current transformer CT1 and one end of the capacitor C11 are respectively connected with a pin 1 of the grid-connected contactor, an output end of the current transformer CT2 and one end of the capacitor C12 are respectively connected with a pin 2 of the grid-connected contactor, the output end of the current transformer CT3 and one end of the capacitor C13 are respectively connected with a pin 3 of the grid-connected contactor, the other end of the reactor 4, the other end of the capacitor C11, the other end of the capacitor C12 and the other end of the capacitor C13 are respectively connected with a pin 4 of the grid-connected contactor, and a pin 5 of the grid-connected contactor is connected with a bus.

The utility model discloses a control method:

1. during normal work, the miniature circuit breaker is closed to continuously supply power to the inversion grid-connected power supply unit, at the moment, the charging unit in the inversion grid-connected power supply unit can continuously charge, and in the continuous charging process, the driver can prevent the charging unit from supplying power to the negative electrode, so that normal power supply of the main power supply circuit L1 to the load is ensured.

2. When the main power supply circuit L1 supplies power normally, the ADC sampling module samples voltages of the main power supply circuit L1 and the standby power supply circuit L2, and collects current data collected by the current sampler in the inversion grid-connected power supply unit.

3. The ADC sampling module can respectively send the acquired voltage and current data to the master control controller, and the master control controller can analyze and judge the acquired circuit data.

4. When the master controller determines that the main power circuit L1 has a fault, the master controller controls the excitation change-over switch to cut off the main power circuit L1 and connect the bus with the standby power circuit L2.

5. In the switching process of the main power supply circuit L1 and the standby power supply circuit L2, the charging unit does not charge any more and discharges, and at this time, the main control controller controls the driver to make the charging unit supply power to the load.

6. When the excitation change-over switch completes the switching between the main power circuit L1 and the standby power circuit L2, the main control controller controls the driver to make the charging unit no longer supply power to the load, and at this time, the standby power circuit L2 supplies power to the load.

7. When the fault of the main power circuit L1 is repaired, the main control controller controls the excitation change-over switch again to cut off the standby power circuit L2 and conduct the bus with the main power circuit L1.

8. In the process of switching the standby power circuit L2 and the main power circuit L1 again, the main control controller controls the driver to enable the charging unit to supply power to the load, and after the excitation change-over switch completes the switching between the standby power circuit L2 and the main power circuit L1, the main control controller controls the driver to enable the charging unit not to supply power to the load any more, and at this time, the main power circuit L1 continuously charges the charging unit again for reuse.

The above description is only for the specific embodiment of the present invention, but the structural features of the present invention are not limited thereto, and any person skilled in the art can make changes or modifications within the scope of the present invention.

Claims

1. A zero-interruption hybrid dual-power automatic conversion device comprises a conversion device body and is characterized in that an excitation conversion switch and a master controller are arranged in the conversion device body, an ADC (analog-to-digital converter) sampling module and an IGBT (insulated gate bipolar transistor) driving output module are mounted on the master controller, the input end of the excitation conversion switch is respectively connected with a main power circuit L1 and a standby power circuit L2, the input end of the excitation conversion switch is connected with a load circuit through a bus, an inversion grid-connected power unit is arranged beside the excitation conversion switch, the input end and the output end of the inversion grid-connected power unit are respectively connected with a main power circuit L1 and a load circuit, the control end of the excitation conversion switch is connected with the signal output end of the master controller, and the main power circuit L1 and the standby power circuit L2 are respectively connected with the ADC sampling module through sampling wires, the current sampling end of the inversion grid-connected power supply unit is connected with the ADC sampling module through a sampling wire, and the bus is connected with the ADC sampling module through the sampling wire.

2. The automatic zero-interruption hybrid dual-power conversion device as claimed in claim 1, wherein a molded case circuit breaker M6 is respectively disposed between the main power circuit L1 and the standby power circuit L2 and the excitation type transfer switch, and a miniature circuit breaker M9 is disposed between the main power circuit L1 and the inversion grid-connected power unit.

3. The automatic zero-interruption hybrid dual-power conversion device as claimed in claim 1, wherein the power circuit L1 includes a live line LA, a live line LB, a live line LC and a neutral line N, the inverter grid-connected power unit includes an isolation transformer and a rectification inverter, the isolation transformer includes a three-phase PFC control unit and a full-bridge DC/DC conversion unit, the three-phase PFC control unit includes an inductor LA, an inductor LB, an inductor LC, a diode D1, a diode D2, a diode D3, a diode D4, a diode D5, a diode D6, a diode D11, a diode D11, an N-MOS transistor M1, an N-MOS transistor M2, a capacitor C1, a capacitor C2, a resistor R1, a resistor R2, and a three-phase PFC modulation controller, one end of the inductor LA is respectively connected to an anode of the diode D1 and a cathode of the diode D4, and the other end of the live line inductor LA is connected to the live line LA, the other end of the inductor Lb is connected with a live wire Lb, the other end of the inductor Lc is connected with a live wire Lc, one end of the inductor Lb is respectively connected with the anode of a diode D2 and the cathode of a diode D5, one end of the inductor Lc is respectively connected with the anode of a diode D3 and the cathode of a diode D6, the grid of the N-MOS transistor M1 and the grid of the N-MOS transistor M2 are respectively connected with the input end of a three-phase PFC modulation controller, the voltage feedback end of the three-phase PFC modulation controller is connected with one end of a resistor R1, the drains of the diode D1, the diode D2, the diode D3 and the N-MOS transistor M1 are respectively connected with the anode of a diode D12, the drains of the diode D4, the diode D5, the diode D6 and the N-MOS transistor M2 are respectively connected with the cathode of a diode D11, the cathode of the diode D12 and one end of a capacitor C1 are respectively connected with one end of a resistor R1, the anode of the diode D11 and one end of the capacitor C2 are respectively connected with one end of a resistor R2, and the other end of the resistor R1, the other end of the resistor R2, the other end of the capacitor C1, the other end of the capacitor C2, the source of the N-MOS tube M1 and the drain of the N-MOS tube M2 are respectively connected with a zero line N.

4. The automatic zero-interrupt hybrid dual-power conversion device as claimed in claim 3, wherein the full-bridge DC/DC conversion unit comprises an SPWM modulation controller, a transistor Q1, a transistor Q2, a transistor Q3, a transistor Q4, a diode D7, a diode D8, a diode D9, a diode D10, a diode D13, a diode D14, a diode D15, a diode D16, a capacitor C3, a capacitor C4, a capacitor C5, a capacitor C6, a capacitor C7, a capacitor C8, a capacitor C9, a capacitor C10, an inductor L1 and a high frequency transformer, wherein the collector of the transistor Q1, the cathode of the diode D13, the collector of the transistor Q2 and the cathode of the diode D14 are respectively connected to the cathode of the diode D12, the emitter of the transistor Q3, the anode of the diode D15, the emitter of the transistor Q4 and the anode of the diode D16 are respectively connected to the anode 11 of the diode D11, the base of the triode Q1 is connected with the SPWM modulation controller, the base of the triode Q2 is connected with the SPWM modulation controller, the base of the triode Q3 is connected with the SPWM modulation controller, the base of the triode Q4 is connected with the SPWM modulation controller, the emitter of the triode Q1 and the collector of the triode Q3 are respectively connected with a pin 1 of the high-frequency transformer, the emitter of the triode Q2 and the collector of the triode Q4 are respectively connected with a pin 2 of the high-frequency transformer, the cathode of the diode D7 and the cathode of the diode D8 are respectively connected with one end of the inductor L1, the cathode of the diode D9 and the anode of the diode D7 are respectively connected with a pin 3 of the high-frequency transformer, the anode of the diode D8 and the cathode of the diode D10 are respectively connected with a pin 4 of the high-frequency transformer, one end of the capacitor C3, One end of a capacitor C4, one end of a capacitor C5 and one end of a capacitor C6 are respectively connected to the other end of the inductor L1, the anode of the diode D9, the anode of the diode D10, one end of a capacitor C7, one end of a capacitor C8 and one end of a capacitor C9 are respectively connected to one end of a capacitor C10, the other end of the capacitor C3, the other end of the capacitor C4, the other end of the capacitor C5, the other end of the capacitor C6, the other end of the capacitor C7, the other end of the capacitor C8 and the other end of the capacitor C9 are respectively connected to the other end of the capacitor C10, and the capacitor C3, the capacitor C4, the capacitor C5, the capacitor C6, the capacitor C7, the capacitor C8, the capacitor C9 and the capacitor C10 constitute a charging unit.

5. The automatic zero-interruption hybrid dual-power conversion device as claimed in claim 4, wherein the rectifying and inverting components comprise a power frequency rectifying component and an inverting and grid-connected component, the power frequency rectifying component comprises a driver J1, a driver J2, a driver J3, a transistor Q5, a transistor Q6, a transistor Q7, a transistor Q8, a transistor Q9, a transistor Q10, a diode D17, a diode D18, a diode D19, a diode D20, a diode D21, a diode D22, an input terminal of the driver J1, an input terminal of the driver J2, and an input terminal of the driver J3 are respectively connected with the IGBT driving and output module, a base of the transistor Q5 and a base of the transistor Q8 are respectively connected with an output terminal of the driver J1, a base of the transistor Q8 and a base of the transistor Q9 are respectively connected with an output terminal of the driver J2, a base of the transistor Q7 and a base of the transistor Q10 are respectively connected with an output terminal of the driver J3, the collector of the triode Q5, the cathode of the diode D17, the collector of the triode Q6, the cathode of the diode D18, the collector of the triode Q7 and the cathode of the diode D19 are respectively connected with the other end of the inductor L1, the emitter of the triode Q5, the anode of the diode D17 and the collector of the triode Q8 are respectively connected with the cathode of the diode D20, the emitter of the triode Q6, the anode of the diode D18 and the collector of the triode Q9 are respectively connected with the cathode of the diode D21, the emitter of the triode Q7, the anode of the diode D19 and the collector of the triode Q10 are respectively connected with the cathode of the diode D22, the emitter of the triode Q8, the anode of the diode D20, the emitter of the triode Q9, the anode of the diode D21, the emitter of the triode Q10 and the anode of the diode D22 are respectively connected with the anode of the diode D10.

6. The automatic zero-interruption hybrid dual-power conversion device as claimed in claim 5, wherein the inverting and grid-connected component comprises a reactor, a current sampler, a capacitor C11, a capacitor C12, a capacitor C13 and a grid-connected contactor, the current sampler is provided with a current transformer CT1, a current transformer CT2 and a current transformer CT3, pins 5, 6 and 7 of the reactor are respectively connected with an emitter of a triode Q5, an emitter of a triode Q6 and an emitter of a triode Q7, pin 8 of the reactor is connected with the other end of the capacitor C3, pins 1, 2 and 3 of the reactor are respectively connected with an input end of the current transformer CT1, an input end of the current transformer CT2 and an input end of the current transformer CT3, an output end of the current transformer CT1 and one end of the capacitor C11 are respectively connected with a pin 1 of the grid-connected contactor, the output end of the current transformer CT2 and one end of the capacitor C12 are respectively connected with a 2-pin of the grid-connected contactor, the output end of the current transformer CT3 and one end of the capacitor C13 are respectively connected with a 3-pin of the grid-connected contactor, a 4-pin of the reactor, the other end of the capacitor C11, the other end of the capacitor C12 and the other end of the capacitor C13 are respectively connected with a 4-pin of the grid-connected contactor, and a 5-pin of the grid-connected contactor is connected with a bus.