CN101510737B - Passive trigger type DC to AC power conversion device - Google Patents

Abstract

A passive trigger type DC-AC energy conversion device comprises a controllable bridge rectifier unit, a power electronic switch, an inductor and an isolation transformer. The controllable bridge rectifier unit is a full-wave rectifier circuit formed by connecting four Silicon Controlled Rectifiers (SCR), wherein two mutually unconnected silicon controlled rectifiers of the controllable bridge rectifier unit form a trigger controlled group, so that the four SCR have two trigger controlled groups. When the power electronic switch is turned on, the two trigger controlled groups are controlled by the operation of the isolation transformer, the controllable bridge rectifier unit and the inductor, especially, the trigger angle conduction mode is used for controlling the two trigger controlled groups, so that the energy of direct current generated by a solar battery or other modes can be converted from the secondary side to the primary side of the isolation transformer in a current mode, and the conversion between direct current electric energy and alternating current electric energy is completed.

Description

Passive triggering type converting device from DE to AC electric energy

Technical field

The invention relates to a kind of passive triggering type converting device from DE to AC electric energy, particularly about a kind of passive triggering type converting device from DE to AC electric energy that does not disturb mains system.

Background technology

Existing free-standing solar energy-electric energy conversion equipment please refer to shown in Figure 1ly, and it comprises a power supply 90, a rectifier diode 91, a storage battery 92, flow to alternating-current converter 93, an AC load 94 and an interface circuit 95 always.This power supply 90 is sent to this storage battery 92 by this rectifier diode 91 with a direct current electric energy, utilizes this storage battery 92 as cushioning to provide a stable electric weight to give this direct current to exchanging converter 93.This direct current converts an AC energy to exchanging the direct current electric energy of converter 93 with this storage battery 92, for should AC load 94 required electric energy.In addition, the interface circuit 95 of this device for converting electric energy is transported to mains system in order to control with unnecessary AC energy, perhaps by this mains system one energy is fed to the interface of this AC load 94.

Referring again to shown in Figure 1, because of this direct current is to produce alternating current by self-oscillation to exchanging converter 93 after all, though the frequency of this alternating current and phase place can provide reference by this mains system, yet, because this design is in the process of operation, if direct current is when exchanging converter 93 and produce faults, can make mains system introduce a large amount of interference, therefore, should must carry out anti-tampering design by existing device for converting electric energy, also because so, it will produce the shortcomings such as the relative raising of complexity of circuit design.In addition, maintain when having a power failure because of needs in mains system, the design of this converter must be installed complicated testing circuit additional, so that detect when being in this state, can open with the mains system escape immediately, otherwise, in the time of can being formed on the mains system power failure, this converter still can continued power, causes seriously interfering with mains system, and so-called " island effect " promptly takes place.For these reasons, be necessary further to improve above-mentioned existing device for converting electric energy.

Summary of the invention

Main purpose of the present invention provides a kind of passive triggering type converting device from DE to AC electric energy, the controllable type bridge rectifier unit and one that has four thyristors by operation one isolating transformer, has the inductor of air gap, so that direct current energy is converted to AC energy, makes the present invention have and reduce installation cost and reduce the effect of controlling complexity; Moreover, can avoid the generation of island effect by operation of the present invention, to reduce the interference of mains system.

According to passive triggering type converting device from DE to AC electric energy of the present invention, it comprises a kind of passive triggering type converting device from DE to AC electric energy, and it comprises a controllable type bridge rectifier unit, an electronic power switch, an inductor and an isolating transformer.This controllable type bridge rectifier unit is by four thyristors (SCR) full-wave rectifying circuit that is formed by connecting, wherein not interconnective each other two thyristors in this controllable type bridge rectifier unit form one and trigger controlled group, and therefore four thyristors then have two triggering controlled group.When the electronic power switch conducting, operation by this isolating transformer, controllable type bridge rectifier unit and inductor, particularly triggering controlled group with these two groups utilizes the mode of trigger angle conducting to control, galvanic energy that a solar cell or other modes can be produced like this, go to primary side with current system by the primary side of this isolating transformer, to finish the conversion between direct current energy and the AC energy.

Wherein: also can comprise an once-through type relay in addition, this once-through type relay is series at the primary side of this isolating transformer, and the control end of this once-through type relay connects this both ends of power.

This inductor can have an air gap.

Other comprises a resistor, and this resistor in series is connected between the 3rd end points of the negative terminal of this power supply and this controllable type bridge rectifier unit.

Other comprises a surge absorber, and this surge absorber is connected in parallel on the contact of this once-through type relay.

This low capacity energy storage device can be selected from a low value capacitor or a low capacity storage battery.

Controllable type bridge rectifier unit also can comprise a buffer circuit, and this buffer circuit is connected between second end points and the 4th end points of this controllable type bridge rectifier unit.

As mentioned above, utilize direct current to exchanging the conversion that converter carries out direct current energy and AC energy compared to existing device for converting electric energy, it has the shortcoming of easy interference mains system, the present invention triggers control by the conducting of this controllable type bridge rectifier unit, to be controlled at the current direction in inductor and the isolating transformer, just can reach the purpose of the conversion of direct current energy and AC energy.And when the mains system interruption maintenance, in default of driving voltage, the inductor of device for converting electric energy of the present invention can stop action, and causes the electric energy conversion to stop, so so-called " island effect " can never take place.Moreover passive triggering type converting device from DE to AC electric energy of the present invention is because of being that the electric energy conversion is carried out on the basis with the alternating current half period, so only need device low capacity energy storage device, it can reduce installation cost really.

Description of drawings

Fig. 1: the circuit diagram of existing passive converting device from DE to AC electric energy.

Fig. 2: the circuit diagram of the passive triggering type converting device from DE to AC electric energy of first embodiment of the invention.

Fig. 3: the passive triggering type converting device from DE to AC electric energy of first embodiment of the invention is when the electronic power switch conducting, and electric current is by the schematic diagram of the primary side outflow of isolating transformer.

Fig. 4: the passive triggering type converting device from DE to AC electric energy of first embodiment of the invention is when the electronic power switch conducting, and electric current is by the schematic diagram of the primary side inflow of isolating transformer.

Fig. 5: the circuit diagram of the passive triggering type converting device from DE to AC electric energy of second embodiment of the invention.

[main element symbol description]

1 regurgitation stream diode, 2 low capacity energy storage devices

3 electronic power switches, 4 loop diodes

5 controllable type bridge rectifier unit, 51 first end points

52second end points 53 the 3rd end points

54 the 4th end points, 55 buffer circuits

6 inductors, 7 isolating transformers

71 primary side, 72 primary sides

8 once-through type relays, 90 power supplys

91 rectifier diodes, 92 storage batterys

93 direct currents are to exchanging converter 94 AC load

95 interface circuit S power supplys

R resistor L load

The Y surge absorber

The SCR1 first thyristor SCR2 second thyristor

SCR3 the 3rd thyristor SCR4 the 4th thyristor

Embodiment

For above-mentioned and other purpose of the present invention, feature and advantage can be become apparent, preferred embodiment of the present invention cited below particularly, and conjunction with figs. are described in detail below:

Please refer to shown in Figure 2ly, the passive triggering type converting device from DE to AC electric energy of first embodiment of the invention comprises a power supply S,regurgitation stream diode 1, a low capacityenergy storage device 2, anelectronic power switch 3, aloop diode 4, a controllable typebridge rectifier unit 5, aninductor 6, anisolating transformer 7, an once-throughtype relay 8 and a resistor R.This controllable typebridge rectifier unit 5 is connected and composed a full-bridge type rectification circuit by one first thyristor SCR1, one second thyristor SCR2, one the 3rd thyristor SCR3 and one the 4th thyristor SCR4, and wherein not interconnective each other two thyristors form one and trigger controlled group (as the first thyristor SCR1 and the 3rd thyristor SCR3 formation one triggering controlled group; Reach the second thyristor SCR2 and the 4th thyristor SCR4 and form another triggering controlled group), therefore four thyristors then have two triggering controlled group.Thisinductor 6 is one to have the inductor of air gap, and this air gap is in order to carrying out store energy, and utilizes the continuous principle of electric current, promotes electric current energy is taken out from this power supply S, feeds back to civil power again.This resistor R is connected in series between the negative terminal and this controllable typebridge rectifier unit 5 of this power supply S, in order to detecting size of current, with the reference as the generation control signal of four thyristor SCR1, SCR2, SCR3 and SCR4 and electronic power switch 3.This power supply S is a reproducible DC power supply, for example a solar energy, wind power generation or give birth to mass-energy source (biomass energy) etc., and this power supply S has an anode and a negative terminal.

Referring again to shown in Figure 2, in the operation of this controllable typebridge rectifier unit 5, under a triggered time, one group is triggered the controlled group conducting that can be triggered at the most, another group triggers controlled group and then is not triggered, for example with this first thyristor SCR1 and the 3rd thyristor SCR3 conducting simultaneously; And this second thyristor SCR2 and the 4th thyristor SCR4 be not because of being subjected to trigger not conducting of control; And these four thyristor SCR1, SCR2, SCR3 and SCR4 can not trigger control yet.So, four thyristor SCR1 by this controllable typebridge rectifier unit 5, SCR2, the triggering control of SCR3 and SCR4 can provide device for converting electric energy of the present invention in control more flexible selection to be arranged, and when triggering control, more can be reduced in the empty wasted work rate in change-over time not, and this device for converting electric energy is to promoteinductor 6 beginnings by mains system earlier, then the electric current of thisinductor 6 comes out the energy drives of this power supply S again, so thisinductor 6 can decommission automatically when external world's power supply stops, therefore can the assurance system island effect can not take place.

Referring again to shown in Figure 2, the power supply S of this passive converting device from DE to AC electric energy,regurgitation stream diode 1 andelectronic power switch 3 are and are connected in series; This low capacityenergy storage device 2, it is arranged between this power supply S and thisregurgitation stream diode 1; One end of the other end of thiselectronic power switch 3 and thisloop diode 4 is connected to first end points 51 (by the anode of the first thyristor SCR1 and the end points that anode connected of the second thyristor SCR2) of this controllable typebridge rectifier unit 5, and the3rd end points 53 of this controllable type bridge rectifier unit 5 (by the negative electrode of the 3rd thyristor SCR3 and the end points that negative electrode connected of the 4th thyristor SCR4) is electrically connected to the negative terminal of this power supply S, the other end of this low capacityenergy storage device 2 and the other end of loop diode 4.Further say it, the3rd end points 53 of this controllable typebridge rectifier unit 5 is preferably series circuit and the other end of thisloop diode 4, the other end of this low capacityenergy storage device 2 and the negative terminal of this power supply S formed by this resistor R and interconnects.

In addition, referring again to shown in Figure 2,second end points 52 of this controllable type bridge rectifier unit 5 (by the negative electrode of the second thyristor SCR2 and the end points that anode connected of the 3rd thyristor SCR3) then is an end that is connected to theprimary side 71 of thisisolating transformer 7, a be connected in series end of thisinductor 6 of the other end of thisprimary side 71, the other end of thisinductor 6 then is connected to the 4th end points 54 (by the negative electrode of the first thyristor SCR1 and the end points that anode connected of the 4th thyristor SCR4) of this controllable type bridge rectifier unit 5.Theprimary side 72 of thisisolating transformer 7 be connected in parallel mains system and at least one load L in parallel.

Please refer to shown in Figure 3,electronic power switch 3 conductings when the passive triggering type converting device from DE to AC electric energy of first embodiment of the invention, and this second thyristor SCR2 and the 4th thyristor SCR4 are when being triggered, this moment, this first thyristor SCR1 and the 3rd thyristor SCR3 were not on-states, because theprimary side 72 of thisisolating transformer 7 is to be connected to this mains system, therefore this isolatingtransformer 7 is induced toprimary side 71 by turn ratio with the voltage (for example 110V or 220V) of this mains system, the electric current that thisprimary side 71 flows out thisinductor 6 of flowing through in regular turn, the 4th thyristor SCR4 of controllable typebridge rectifier unit 5, resistor R, power supply S,regurgitation stream diode 1, the second thyristor SCR2 ofelectronic power switch 3 and controllable typebridge rectifier unit 5, return the other end ofprimary side 71, to form a loop.

Please refer to shown in Figure 4,electronic power switch 3 conductings when the passive triggering type converting device from DE to AC electric energy of first embodiment of the invention, and this first thyristor SCR1 and the 3rd thyristor SCR3 are when being triggered, this second thyristor SCR2 and the 4th thyristor SCR4 are because of being triggered, and be not on-state, at this moment, the electric current that flows into thisprimary side 71 thisprimary side 71 of flowing through in regular turn, the 3rd thyristor SCR3 of controllable typebridge rectifier unit 5, resistor R, power supply S,regurgitation stream diode 1,electronic power switch 3, the first thyristor SCR1 and theinductor 6 of controllable typebridge rectifier unit 5, and form a loop.

Shown in Fig. 3 and 4, the passive triggering type converting device from DE to AC electric energy of first embodiment of the invention further is arranged in parallel this low capacityenergy storage device 2 in this power supply S.This low capacityenergy storage device 2 can be selected from a low value capacitor or a low capacity storage battery, this low capacityenergy storage device 2 does not need to store many energy, this low capacityenergy storage device 2 because of only needing half ac period of conducting at every turn, thiselectronic power switch 3 gets final product, so need not be powered for a long time.

Shown in Fig. 3 and 4, when controllable type bridge rectifier of thepresent invention unit 5 triggers when control, this resistor R can be used for detecting the flow through size and the waveform thereof of electric current on this inductor 6.By this, because thyristor SCR1, SCR2, SCR3 and SCR4 can control according to its trigger angle, therefore by detected current waveform, the trigger angle in the time of can triggering control for two triggering controlled group of this controllable type bridge rectifier unit is as the reference foundation.

Shown in Fig. 3 and 4, (form triggering and conducting as controlling the first thyristor SCR1 and the 3rd thyristor SCR3 by two wherein one group of formation conductings that trigger controlled group that trigger this controllable typebridge rectifier unit 5 of control; Or control the second thyristor SCR2 and the 4th thyristor SCR4 and form triggering and conducting), and by the conducting of thiselectronic power switch 3, two kinds of flow directions from above-mentioned electric current, the current direction of this power supply S is permanent in forward, that is flow to anode by negative terminal, therefore this power supply S is in the role of energy supply all the time, and the energy of this power supply S can feed back to mains system by the induced current of these isolatingtransformer 7 primary sides 72.In addition, because the required electric energy of load L of the present invention (being connected between mains system and the primary side 72) usually also can be by the mains system supply, so the energy output of device for converting electric energy of the present invention just replenishes mains system, can't influence the normal operation of load L, this characteristic extremely is fit to this power supply S and one has the power supply of unsettled power generation characteristics, for example solar power generation, wind power generation or give birth to mass-energy source etc.

Shown in the 3rd and 4 figure, if four thyristor SCR1, SCR2, SCR3 and SCR4 of this controllable typebridge rectifier unit 5 all are not subjected to trigger control, and when not being switched on,primary side 72 in this isolatingtransformer 7 promptly is open-circuit condition, so, have only theprimary side 72 of thisisolating transformer 7 to constitute dummy load for AC system.For further reducing passive triggering type converting device from DE to AC electric energy of the present invention to the dependence of AC system at non-power conversion (the direct current conversion exchanges) time internal burden, once-throughtype relay 8 of the present invention is connected in series in theprimary side 72 of thisisolating transformer 7, this once-throughtype relay 8 is controlled by this power supply S, if this power supply S continues supply voltage, then drive this once-throughtype relay 8 conductings; Otherwise, if this power supply S can't continue to supply voltage, then this once-throughtype relay 8 forms open circuit, and for example when night, solar panels will can't carry out the operation of direct current energy conversion AC energy in the long period, that is, can't absorb energy and supply energy output, this once-throughtype relay 8 then is open-circuit condition, at this moment, device for converting electric energy of the present invention is understood automatic escape to AC system, and then the burden of mains system is significantly reduced.Wherein the contact of this once-throughtype relay 8 is parallel with a surge absorber Y, in order to carry out discharge prevention.

Moreover, referring again to shown in Figure 2, when civil power during because of chance failure moment escape, if this power supply S continues to provide current to thisprimary side 71, then lack the supply of alternating voltage because of thisprimary side 71, make this resistor R can detect big in a flash electric current, provide a control signal this moment, closes thiselectronic power switch 3 rapidly, in the case, this electric current constitutes a loop via thisloop diode 4, the electric current in the slow consumption loop, and be reduced to zero.

Please refer to shown in Figure 5ly, it discloses the passive triggering type converting device from DE to AC electric energy of second embodiment of the invention.Compared to first embodiment, the controllable typebridge rectifier unit 5 of second embodiment is that a buffer circuit (snubber circuit) 55 further is set between thissecond end points 52 and the4th end points 54, and thisbuffer circuit 55 is made up of the resistance electric capacity of connecting.Under the state of a triggering controlled group wherein in not conducting, still can some aftercurrent exist, at this moment, can utilize thisbuffer circuit 55 to form a loop, with this aftercurrent of releasing.

As mentioned above, utilize direct current to exchanging the conversion that converter carries out direct current energy and AC energy compared to existing device for converting electric energy, it has the shortcoming of easy interference mains system, the present invention triggers control by the conducting of this controllable typebridge rectifier unit 5, to be controlled at the current direction ininductor 6 and the isolatingtransformer 7, just can reach the purpose of the conversion of direct current energy and AC energy.And when the mains system interruption maintenance, in default of driving voltage, theinductor 6 of device for converting electric energy of the present invention can stop action, and causes the electric energy conversion to stop, so so-called " island effect " can never take place.Moreover passive triggering type converting device from DE to AC electric energy of the present invention is because of being that the electric energy conversion is carried out on the basis with the alternating current half period, so only need device low capacityenergy storage device 2, it can reduce installation cost really.

Claims (7)

1. passive triggering type converting device from DE to AC electric energy is characterized in that it comprises:

A power supply, this power supply are a DC power supply, and this power supply has an anode and a negative terminal;

A regurgitation stream diode, this regurgitation stream diode is connected in series in this power supply;

A low capacity energy storage device is in parallel with this power supply of connecting and this regurgitation stream diode;

An electronic power switch, an end are connected in series in this power supply and this regurgitation stream diode;

A loop diode, the other end of an end and this electronic power switch interconnects, and this loop diode other end then connects the negative terminal of this power supply;

A controllable type bridge rectifier unit, form a full-bridge type rectification circuit by four thyristors, wherein not interconnective each other two thyristors form one group and trigger controlled group, promptly this controllable type bridge rectifier unit has two groups of triggering controlled group, this controllable type bridge rectifier unit selects at the most one group to trigger be triggered conducting or two groups of controlled group and trigger controlled group and all be not subjected to triggering and conducting, this controllable type bridge rectifier unit has four end points, first end points of this controllable type bridge rectifier unit is connected with an end of the other end of this electronic power switch and loop diode, and the 3rd end points of this controllable type bridge rectifier unit and the negative terminal of this power supply, the other end of the other end of low capacity energy storage device and loop diode electrically connects;

An inductor, an end is connected with the 4th end points of this controllable type bridge rectifier unit; And

An isolating transformer has a primary side and a primary side, its primary side mains system in parallel, and an end of its primary side is connected with the other end of this inductor, and the other end of this primary side then is connected with second end points of this controllable type bridge rectifier unit.

2. passive triggering type converting device from DE to AC electric energy according to claim 1, it is characterized in that: other comprises an once-through type relay, this once-through type relay is series at the primary side of this isolating transformer, and the control end of this once-through type relay connects this both ends of power.

3. passive triggering type converting device from DE to AC electric energy according to claim 2 is characterized in that: other comprises a surge absorber, and this surge absorber is connected in parallel on the contact of this once-through type relay.

4. passive triggering type converting device from DE to AC electric energy according to claim 1 is characterized in that: this inductor has an air gap.

5. passive triggering type converting device from DE to AC electric energy according to claim 1 is characterized in that: other comprises a resistor, and this resistor in series is connected between the 3rd end points of the negative terminal of this power supply and this controllable type bridge rectifier unit.

6. passive triggering type converting device from DE to AC electric energy according to claim 1 is characterized in that: this low capacity energy storage device is selected from a low value capacitor or a low capacity storage battery.

7. passive triggering type converting device from DE to AC electric energy according to claim 1, it is characterized in that: controllable type bridge rectifier unit comprises a buffer circuit in addition, and this buffer circuit is connected between second end points and the 4th end points of this controllable type bridge rectifier unit.

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