CN203617898U - Inverter zero charge starting and stopping circuit - Google Patents

Abstract

The utility model relates to an inverter zero charge starting and stopping circuit, which divides power supply for an inverter into a major loop power supply and a control circuit power supply, wherein the major loop power supply means connecting a circuit between the power supply and a current-limiting resistor in series connection with a relay RY1 and a relay RY 2; a SSR static state switch is connected between the power supply, the current-limiting resistor and a direct current bus capacitance; the control circuit power supply means connecting a starting-and-stopping circuit between the positive and the negative end of the power supply; a relay RY4 is in series connection with the positive end of the power supply and the inversion control circuit; the starting-and-stopping circuit controls the inversion control circuit via the relay RY4 by external connection of a starting button and a stopping button; the starting-and-stopping circuit receives state return signal of the inversion control circuit to realize fault sequential control; and the output end of the inverter is connected to an output contactor MOUT to realize inverter output control. In the utility model, power is supplied to the inversion control before the major loop, and power is disconnected to the inversion control after the major loop, and the inversion control circuit will not power down.

Description

A kind of inverter zero charge starts and halt circuit

Technical field

The utility model belongs to inverter safety operation control field, and especially a kind of inverter zero charge starts and halt circuit.

Background technology

High voltage bus inversion transformation technique possesses low-loss, high efficiency feature, therefore current most inverter is all taked high voltage dc bus inverter structure, even if low pressure small-power inverter, also often take the mode of inversion after first boosting, wherein common with DC300V-DC800V inversion transformation technique, this is due to power electronic device range of choice broadness within the scope of this.

But the foundation of high voltage bus proposes again new requirement with withdrawing for inversion control, people too much pay close attention to invert function, efficiency, volume weight etc. problem, and seldom pay close attention to border process and the static security characteristics such as inversion starts, stops.At present,, make it starting, stop, static state all exists hidden danger owing to lacking strict powering on and remove electric control sequential in inverter field.Subject matter has following 3 points: the first, and the risk competition that start process exists major loop and control loop to power on.The second, there is electric arcing in stopping process, high pressure residual charge control failure phenomenon.The 3rd, in the time that inverter is static, the inner high pressure residual charge being detained is difficult to release in the short time, brings potential safety hazard to human-machine operation.

Fig. 1 is direct bus inversion sketch.When after input air K switch 1 closure, control loop works on power at once, major loop by current-limiting resistance R1 to the slow charging of dc-link capacitance C, after electric capacity is full of, by K2 switch by the bypass of resistance short circuit, inverter work afterwards.Fig. 2 is DC/DC isolation inverter structure sketch.When after input switch K1 closure, control loop works on power at once, realizes isolation by DC/DC converter, and PWM controls progressively high voltage bus, after bus capacitor is full of, and inverter circuit work.Therefrom we can find out, the startup shut-down operation of inverter is all that the disjunction by input air switch realizes, and after power-off, high pressure residual charge is released in high process, and inversion device is in slave mode not, and conducting phenomenon easily appears disturbing in inverter bridge leg.

Summary of the invention

The purpose of this utility model is to overcome the deficiencies in the prior art, provides a kind of inverter zero charge to start and halt circuit.

The utility model solves its technical problem and takes following technical scheme to realize:

A kind of inverter zero charge starts and halt circuit, comprise the current-limiting resistance of inverter, dc-link capacitance, inverter control circuit, innovation of the present utility model is: the power supply of inverter is divided into main circuit power supply and control loop power supply two parts by it, described main circuit power supply is the circuit being connected on the node between power positive end and current-limiting resistance by relay R Y1 and RY2 series connection, on the node between power positive end and current-limiting resistance and dc-link capacitance, be connected SSR static switch and realize main circuit power supply control, described control loop power supply is between the positive and negative two ends of power supply, to connect to start halt circuit, between power positive end and inverter control circuit, be connected in series relay R Y4, start halt circuit by external startup button and stop key, control inverter control circuit via relay R Y4, thereby the complete machine of guiding inverter starts and stops, starting halt circuit is also connected with inverter control circuit, receive the state return path signal of inverter control circuit, realize fault sequencing control, simultaneously, realize the output control of inverter at the output connection output contactor MOUT of inverter.

And, described startup halt circuit is by the first to the 5th cell formation, wherein first module is power subsystem, it is the working power that starts halt circuit, second unit is for starting stop operation unit, Unit the 3rd is major loop charging control unit, and Unit the 4th is output control unit, and Unit the 5th is static switch driver element.

And, described first module comprises that DC300V Power supply is to PWR terminal, be divided into two-way by PWR terminal, one tunnel exports Unit the 5th to, and another road is through switch power module MK2, converts to+12V, GND ,-12V power output, for whole circuit provides power supply, simultaneously also in DCPWR terminal place output, for the power supply of expanded circuit, power module MK2+12 outputs and ground between coupling capacitor C X1, CX2, the CX3 of taking off in parallel.

And, described second unit is by starting and stopping key, the break-make of control relay RY4 contact, set up inversion mainboard working power DC300V, and make inversion mainboard working power possess following features: to set up and be synchronized with start-up operation, withdraw and postpone in shut-down operation, shielding restarting, the output signal STR=0 in second unit is sent to Unit the 3rd.

And, described Unit the 3rd receives two paths of signals, one tunnel is inversion fault return path signal FAULT=1, high level represents fault case, low level represents normally, another road is signal STR=0, low level represents to start, high level represents to stop, in starting state and passback fault-free while setting up simultaneously, major loop charging starts startup work: relay R Y1 contact is closed at once, major loop passes through RY1, RY2, the restricted flow passage that outer meeting resistance R forms, charge to bus capacitor, until time delay after 8 seconds, drive signal DRV=1 to transfer high level to by low level, to drive static switch SSR conducting, the output signal DRV=1 of Unit the 3rd will transmit respectively Unit the 4th and Unit the 5th.

When signal, STR=0 transfers high level to, and shut-down operation has been carried out in explanation, and its execution result is: relay R Y1 discharges, and RY1 normally opened contact cuts off restricted flow passage, and meanwhile, signal DRV=1 transfers low level to, and static switch SSR turn-offs;

When signal, FAULT=1 transfers high level to, and inverter exists fault, and its execution result is: relay R Y2 adhesive, and RY2 normally-closed contact cuts off restricted flow passage, and meanwhile, signal DRV=1 transfers low level to, and static switch SSR turn-offs.

And described Unit the 4th receives two paths of signals, a road is the DRV=1 signal that Unit the 5th transmits, high level represents static switch SSR conducting, another road is inverter operation return path signal RUN=1, and after invertor operation is opened, this signal transfers high level to, in the time that these two conditions are set up simultaneously, after time delay 5 seconds, the action of inversion output contactor MOUT is controlled in relay R Y5 contact, realizes inversion output, as long as a condition does not meet, inversion output is cut off at once.

And described Unit the 5th receives the DRV=1 signal from Unit the 3rd, drives static switch SSR conducting when high level, low electricity turn-offs, and switch power module MK1 is isolation drive power supply, and relay R Y8 realizes signal isolation.

Advantage of the present utility model and good effect are:

1, as a whole, startup halt circuit of the present utility model is equivalent to, to common inverter, a switching on and shutting down operating system has been installed, and has realized invertor operation by zero charge inactive state-inverter mode--the physical state conversion of zero charge inactive state; Realize major loop device under inversion malfunction and, in slave mode, avoided the associated infringement of fault to input direct-current (storage battery) and output loading, its control theory and inversion topological structure-irrelevant, this technology possesses universality feature.

2, the utility model, in start-up course, possesses the feature that inversion control powers on prior to major loop; In stopped process, possess after inversion control in the feature of major loop dead electricity; Possess under inversion fault, not power down of inverter control circuit, prevents the feature that major loop is out of control.

3, the control semiconductor static switch form of the utility model direct current major loop, eliminates electric arcing, calcination contact phenomenon.

4, the utility model makes inversion control power on prior to major loop by starting sequential, realizes the controlled power up of major loop, the impact of having avoided risk competition to bring power device.

5, after the utility model inverter exhausts high pressure residual charge, inversion control is just shut down, the phenomenon that abatement device is out of control.

6, the utility model has been realized inversion zero charge stopping function, provides safety assurance to personnel.

7, the utility model, under inversion fault condition, keeps the maximum controlled usefulness of power device and prevents that inversion fault is to input direct-current side and the associated infringement of load-side.

Accompanying drawing explanation

Fig. 1 is existing direct bus inversion sketch;

Fig. 2 is existing DC/DC isolation inverter structure sketch;

Fig. 3 is that the utility model possesses zero charge startup and stops the inverter circuit structure diagram of controlling;

Fig. 4 is the first module circuit structure diagram that the utility model starts halt circuit;

Fig. 5 is the second unit circuit structure diagram that the utility model starts halt circuit;

Fig. 6 is the 3rd element circuit structure chart that the utility model starts halt circuit;

Fig. 7 is the 4th element circuit structure chart that the utility model starts halt circuit;

Fig. 8 is the 5th element circuit structure chart that the utility model starts halt circuit;

Fig. 9 is the circuit structure diagram that the utility model starts halt circuit.

Embodiment

Below in conjunction with accompanying drawing, the utility model embodiment is further described,

A kind of inverter zero charge starts and halt circuit, as shown in Figure 3, comprise the current-limiting resistance of inverter, dc-link capacitance, inverter control circuit, innovative point of the present utility model is, the power supply of inverter is divided into main circuit power supply and control loop power supply two parts by it, described main circuit power supply is the circuit being connected on the node between power positive end and current-limiting resistance by relay R Y1 and RY2 series connection, on the node between power positive end and current-limiting resistance and dc-link capacitance, be connected SSR static switch and realize main circuit power supply control, described control loop power supply is between the positive and negative two ends of power supply, to connect to start halt circuit, between power positive end and inverter control circuit, be connected in series relay R Y4, start halt circuit by external startup button and stop key, control inverter control circuit via relay R Y4, thereby the complete machine of guiding inverter starts and stops, starting halt circuit is also connected with inverter control circuit, receive the state return path signal of inverter control circuit, realize fault sequencing control, simultaneously, realize the output control of inverter at the output connection output contactor MOUT of inverter.

In concrete enforcement of the present utility model, as shown in Figure 9, described startup halt circuit is by the first to the 5th cell formation, wherein first module is power subsystem, be the working power that starts halt circuit, second unit is for starting stop operation unit, and Unit the 3rd is major loop charging control unit, Unit the 4th is output control unit, and Unit the 5th is static switch driver element.

As shown in Fig. 5 or 9, in second unit, by starting and stopping key, the break-make of control relay RY4 contact, set up inversion mainboard working power DC300V, and make inversion mainboard working power possess following features: set up and be synchronized with start-up operation, withdraw and postpone in shut-down operation, shielding restarting, the output signal STR=0 in second unit is sent to Unit the 3rd.

As shown in Fig. 6 or 9, Unit the 3rd receives two paths of signals, one tunnel is inversion fault return path signal FAULT=1, high level represents fault case, low level represents normally, another road is signal STR=0, low level represents to start, high level represents to stop, in starting state and passback fault-free while setting up simultaneously, major loop charging starts startup work: relay R Y1 contact is closed at once, major loop passes through RY1, RY2, the restricted flow passage that outer meeting resistance R forms, charge to bus capacitor, until time delay after 8 seconds, drive signal DRV=1 to transfer high level to by low level, to drive static switch SSR conducting, the output signal DRV=1 of Unit the 3rd will transmit respectively Unit the 4th and Unit the 5th.

When signal, STR=0 transfers high level to, and shut-down operation has been carried out in explanation, and its execution result: relay R Y1 discharges, and RY1 normally opened contact cuts off restricted flow passage.Meanwhile, signal DRV=1 transfers low level to, and static switch SSR turn-offs.

When signal, FAULT=1 transfers high level to, illustrates that inverter exists fault, its execution result: relay R Y2 adhesive, RY2 normally-closed contact cuts off restricted flow passage.Meanwhile, signal DRV=1 transfers low level to, and static switch SSR turn-offs.

As shown in Fig. 7 or 9, Unit the 4th is output control unit, and it receives two paths of signals, one tunnel is the DRV=1 signal that Unit the 5th transmits, and high level represents static switch SSR conducting, and another road is inverter operation return path signal RUN=1, after invertor operation is opened, this signal transfers high level to, and in the time that these two conditions are set up simultaneously, time delay is after 5 seconds, the action of inversion output contactor MOUT is controlled in relay R Y5 contact, realize inversion output, as long as a condition does not meet, inversion output is cut off at once.

As shown in Fig. 8 or 9, Unit the 5th is static switch driver element, receives the DRV=1 signal from Unit the 3rd, when high level, drive static switch SSR conducting, low electricity turn-offs, and switch power module MK1 is isolation drive power supply, and relay R Y8 realizes signal isolation.

In physical circuit of the present utility model, as shown in Figure 4, described first module comprises that DC300V Power supply, to PWR terminal, is divided into two-way by PWR terminal, one tunnel exports Unit the 5th to, another road is through switch power module MK2, converts to+12V, GND ,-12V power output, for whole circuit provides power supply, also export at DCPWR terminal place simultaneously, for the power supply of expanded circuit, power module MK2+12 outputs and ground between coupling capacitor C X1, CX2, the CX3 of taking off in parallel

In physical circuit, take off coupling capacitor C X1, CX2, CX3 are the 1U patch capacitor of 1206 encapsulation, power module MK2 is the products A C/DC module of Shanghai three reference power supply Co., Ltds, model MSPS-12D3.

In physical circuit of the present utility model, as shown in Figure 5, described second unit is included in 1 of terminal CN1, the external startup button of 2 pin, external the stopping key of 3,4 pins of terminal CN1, in the time pressing start key, relay R Y9 enters self-sustaining attracting state, relay R Y7 adhesive simultaneously, and the contact passback of relay R Y7 will disconnect and start button loop, cannot carry out restarting, after relay R Y9 adhesive, signal STR=0 transfers low level to by high level at once, and is sent to Unit the 3rd.Simultaneously, signal STR=0 exports inversion signal through U1F, then the delay network forming by diode D2, resistance R 8, resistance R 11 and electrochemical capacitor E1, realize impedance transformation through U1E, U1D, exported by U1D, through luminous tube LED2 and the final base stage that drives triode Q3 of resistance R 2, the collector electrode of Q3 drives the coil of relay R Y4 and RY7 again, and D4 is fly-wheel diode.The contact of relay R Y4 is drawn by terminal CN3, and the contact of relay R Y7 is used for shielding passback.Because time delay network diode D2, resistance R 8, resistance R 11 and electrochemical capacitor E1 only postpone shut-down operation, not to start-up operation time delay, pressing after start key, RY9 adhesive, RY7, RY4 be synchronous adhesive also, after RY7 adhesive, will shield start-up operation.The external direct current input of terminal CN3-1 DC300V, terminal CN3-2 is DC output end.Along with the adhesive of RY4, will produce the output of DC300V direct current at CN3-2, this direct current output is inversion mainboard working power.This process is called the foundation of inversion mainboard working power.

Pressing after stop key, RY9 discharges at once, due to time delay network diode D2, resistance R 8, resistance R 11 and electrochemical capacitor E1 only postpone shut-down operation, RY4 still keeps adhesive about 13 seconds, still work of inversion motherboard circuit in this course, and the major loop electric channel of inverter is cut off, high pressure residual charge on DC bus by by inverter to consume totally from the mode of power consumption, final RY7, RY4 discharges, terminal CN3-2 direct current output vanishing, inversion mainboard dead electricity and quitting work, inverter enters cold holding state, RY7 shields release, wait for again and starting.This process is called withdrawing of inversion mainboard working power.

In concrete enforcement, described startup button is for often opening runback bit-type, described stopping key as the normally closed runback bit-type of closing, described U1D, U1E, U1F all adopt integrated circuit MC140106, described relay R Y9 model is DS2Y/D12, relay R Y7 model is HRAH-SD12, and relay R Y4 model is 13F-D12/2P.

In physical circuit of the present utility model, as shown in Figure 6, described Unit the 3rd comprises, terminal CN6 is the state return path signal receiving from inverter control circuit, wherein CN6-1, and 2 transmit inversion fault-signal FAULT=1, high level represents fault case, and low level represents normally.Signal FAULT=1 directly drives coil and the buzzer BELL of relay R Y6, RY2, and D5 is fly-wheel diode, and R17 series LED 5 formation states show branch road.

Input signal STR=0, the time delay network forming through U1A, diode D1, resistance R 7, resistance R 10 and electrochemical capacitor E2, the normally closed some NC--common point COM of U1B, U1C and relay R Y6, finally produces output signal DRV=1 again, and wherein R5 is output pull down resistor.In addition, signal STR=0, through trigger U1A, LED 1, the resistance R 4 of serial connection, finally drives triode Q4 base stage, and Q4 collector electrode drives the coil of relay R Y1, and D6 is fly-wheel diode.

In the time that inverter is normal, relay R Y6 is in release condition.If but there is inversion fault, and due to relay R Y6 adhesive at once, buzzer BELL reports to the police, and DRV=1 signal also will synchronously transfer low level to.In other words, once there is inversion fault, DRV=1 signal transfers low level at once to, through the 5th element circuit close synchronously SSR static switch, cuts off inversion output contactor MOUT through the 4th units synchronization.

Pressing after start key, signal STR=0 transfers low level to by high level at once, and triode Q4 drives relay R Y1 adhesive; The input of inverter is just charged the current-limiting resistance R that--the normally closed of common point, relay R Y2 closed--common point, terminal CN5 connect by the normal battle of relay R Y1 outward to dc-link capacitance.Approximately time delay is after 8 seconds, and after dc-link capacitance is full of, signal DRV=1 transfers high level to by low level, drives static switch SSR conducting.This process is called the foundation in the main electric loop of direct current.

When pressing after stop key, signal STR=0 transfers high level to by low level at once, and relay R Y1 synchronously discharges, RY1 break of contact current-limiting charge passage; Meanwhile, signal DRV=1 also transfers low level to, and static switch SSR closes.This process is called withdrawing of the main electric loop of direct current.

When signal, FAULT=1 transfers high level to, illustrates that inverter exists fault, and relay R Y2 is synchronous adhesive, its break of contact current-limiting charge passage.Meanwhile, signal DRV=1 transfers low level to, and static switch SSR turn-offs.This process is called troubleshooting action.

In concrete enforcement, the equal model of described relay R Y1, RY2 is SLC/DC12, RY6 model is HRAH SD12, described triode Q4 model is TIP122, described terminal CN6 is IDD10, described terminal CN5, CN4 all adopt CH762/2P, and described U1A, U1B, U1C all adopt integrated circuit MC140106, and described SSR static switch is bipolar insulated gate triode IGBT.

In physical circuit of the present utility model, as shown in Figure 7, as described above, the terminal CN6 of described Unit the 4th is the state return path signal receiving from inverter control circuit, wherein terminal CN6-3,4 transmit inverter operation return path signal RUN=1, represent that inverter is in start when high level, and low level represents that inverter is in hot holding state.

Signal RUN=1 with from the output signal DRV=1 acting in conjunction of Unit the 3rd in two inputs of U2D, and the delay network forming through U2C, by diode D7, resistance R 9, resistance R 12, electrochemical capacitor E3, realize impedance transformation through U2A serial connection U2B again, finally by LED 4, resistance R 13, arrive triode Q1 base stage, the collector electrode of Q1 drives the coil of relay R Y5, and D8 is that fly-wheel diode, CB5 are arc extinguishing electric capacity.In addition, the contact of RY5 is drawn by terminal CN8.Outside DC300V is connected in series the coil of contactor MOUT, then is connected in series the terminal of CN8, finally arrives DC0V.The break-make of the contact of RY5 is by the attracting state of control contactor MOUT obviously.MOUT is inversion output contactor, accepts break-make relation between inversion and load.Only transferring high level and signal DRV=1 at signal RUN=1 is also high level, when these two conditions are set up simultaneously, represents inversion start and non-failure conditions, postpone after 5 seconds, RY5 adhesive, the coil power supply loop of MOUT will be connected in the contact of RY5, and inverter is realized output.As long as a condition does not meet, output is cut off at once.Thereby guarantee in four kinds of situations the relation that cuts off between inversion and load.These four kinds of situations comprise: under the cold holding state of inversion, under hot holding state, under malfunction, the inferior situation of inversion start-up course state,

In concrete enforcement, described U2A, U2B, U2C all adopt and all adopt integrated circuit MC14093, and described triode Q1 model is TTP122, and described relay R Y5 model is 13F-D12/2P, and described terminal CN8 model is CH7.62/2P.

In physical circuit of the present utility model, as shown in Figure 8, described Unit the 5th comprises, input signal DRV=1, LED 3, resistance R 3 by series connection drive triode Q2, adhesive and the release of triode Q2 output control relay RY3, relay R Y8, wherein the contact of relay R Y3 is drawn by terminal CN2, for expansion cascading control; Relay R Y8 selects bias voltage by its contact, realizes the driving for static switch, and static switch is bipolar insulated gate triode IGBT.Terminal CN7 connects twisted-pair feeder outward, drives IGBT's.In addition, because being necessary for insulating power supply, IGBT drives, so MK1 adopts the products A C/DC module of Shanghai three reference power supply Co., Ltds, single channel 24V, model MSPS-24D3.Produce by R15, E5, ZD1, E4 the bias potential that bipolar insulated gate triode IGBT drives.

As above describe, in the trouble-free situation of inversion, along with pressing start key, inversion mainboard at once electric work, RY1 adhesive, slowly charging to dc-link capacitance in current-limiting charge loop, has avoided major loop heavy current impact.Afterwards, postpone about 8 seconds, signal DRV=1 transfers high level to by low level, drives the conducting of SSR static switch, and the main electric loop of direct current has been set up.Receiving after inverter operation return path signal RUN=1, then time delay 5 seconds, after invertor operation is thoroughly stable, inversion output contactor MOUT adhesive, realizes the power supply to load.Referring to the 3rd, the 4th element circuit and inverter structure Fig. 3.When pressing after stop key, RY1 discharges, and current-limiting charge loop cuts off, and static switch is closed, the withdrawing of the main electric loop of direct current.Inversion main board power supply stops time delay for 13 seconds, during this period of time in, exhaust the residual charge of DC bus by utilizing from the mode of power consumption, and shielding restarting, referring to second unit.Once inversion fault, signal DRV=1 will transfer low level at once, and static switch is closed, and inversion output is closed.

It is emphasized that; embodiment described in the utility model is illustrative; rather than determinate; therefore the utility model is not limited to the embodiment described in embodiment; every other execution modes that drawn according to the technical solution of the utility model by those skilled in the art, belong to the scope that the utility model is protected equally.

Claims (7)

1. an inverter zero charge starts and halt circuit, comprise the current-limiting resistance of inverter, dc-link capacitance, inverter control circuit, it is characterized in that: the power supply of inverter is divided into main circuit power supply and control loop power supply two parts by it, described main circuit power supply is the circuit being connected on the node between power positive end and current-limiting resistance by relay R Y1 and RY2 series connection, on the node between power positive end and current-limiting resistance and dc-link capacitance, be connected SSR static switch and realize main circuit power supply control, described control loop power supply is between the positive and negative two ends of power supply, to connect to start halt circuit, between power positive end and inverter control circuit, be connected in series relay R Y4, start halt circuit by external startup button and stop key, control inverter control circuit via relay R Y4, thereby the complete machine of guiding inverter starts and stops, starting halt circuit is also connected with inverter control circuit, receive the state return path signal of inverter control circuit, realize fault sequencing control, simultaneously, realize the output control of inverter at the output connection output contactor MOUT of inverter.

2. a kind of inverter zero charge according to claim 1 starts and halt circuit, it is characterized in that: described startup halt circuit is by the first to the 5th cell formation, wherein first module is power subsystem, it is the working power that starts halt circuit, second unit is for starting stop operation unit, Unit the 3rd is major loop charging control unit, and Unit the 4th is output control unit, and Unit the 5th is static switch driver element.

3. a kind of inverter zero charge according to claim 2 starts and halt circuit, it is characterized in that: described first module comprises that DC300V Power supply is to PWR terminal, be divided into two-way by PWR terminal, one tunnel exports Unit the 5th to, another road is through switch power module MK2, convert to+12V, GND ,-12V power output, for whole circuit provides power supply, also export at DCPWR terminal place simultaneously, for the power supply of expanded circuit, power module MK2+12 outputs and ground between coupling capacitor C X1, CX2, the CX3 of taking off in parallel.

4. a kind of inverter zero charge according to claim 2 starts and halt circuit, it is characterized in that: described second unit comprises startup and stops key, by starting and the break-make of the control relay RY4 contact that stops key, set up inversion mainboard working power DC300V.

5. a kind of inverter zero charge according to claim 2 starts and halt circuit, it is characterized in that: Unit the 3rd that described major loop charging is controlled, in the time that major loop charging starts to start work, the relay R Y1 closing of contact, the restricted flow passage that major loop consists of RY1, RY2, outer meeting resistance R, to bus capacitor charging, after 8 seconds, will drive static switch SSR conducting until time delay.

6. a kind of inverter zero charge according to claim 2 starts and halt circuit, it is characterized in that: in described Unit the 4th, signal RUN=1 with from the output signal DRV=1 acting in conjunction of Unit the 3rd in two inputs of U2D, and the delay network forming through U2C, by diode D7, resistance R 9, resistance R 12, electrochemical capacitor E3, realize impedance transformation through U2A serial connection U2B again, finally by LED 4, resistance R 13, arrive triode Q1 base stage, the collector electrode of Q1 drives the coil of relay R Y5.

7. a kind of inverter zero charge according to claim 2 starts and halt circuit, it is characterized in that: in described Unit the 5th, drive triode Q2 by LED 3, the resistance R 3 of series connection, adhesive and the release of triode Q2 output control relay RY3, relay R Y8, wherein the contact of relay R Y3 is drawn by terminal CN2, for expansion cascading control, relay R Y8 realizes the driving for static switch by its contact, and static switch is bipolar insulated gate triode IGBT.

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