CN105991058A - DC/AC conversion device and operation method thereof - Google Patents
DC/AC conversion device and operation method thereof Download PDFInfo
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- CN105991058A CN105991058A CN201510044911.9A CN201510044911A CN105991058A CN 105991058 A CN105991058 A CN 105991058A CN 201510044911 A CN201510044911 A CN 201510044911A CN 105991058 A CN105991058 A CN 105991058A
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Abstract
The present invention relates to a DC/AC conversion device and an operation method thereof. The DC/AC conversion device converts a DC input power supply into a three-phase AC output power supply, and comprises an input capacitor set, a first conversion circuit, a second conversion circuit and a control circuit. The input capacitor set is connected with the DC input power supply and has a neutral point, wherein the neutral point is connected with a first phase sequence of the three-phase AC output power supply. The first conversion circuit is connected with a second phase sequence and a third phase sequence of the three-phase AC output power supply, and the second conversion circuit is connected with the first, second and third phase sequences of the three-phase AC output power supply. The control circuit generates a plurality of control signals, and controls the first and second conversion circuits separately to convert the DC input power supply into the three-phase AC output power supply. The improved DC/AC conversion device of the present invention can achieve the purpose of saving the number of the switches, the output inductor sets and the output capacitor sets via a circuit element of which one phase sequence is simplified.
Description
Technical field
The relevant a kind of DC-AC conversion equipment of the present invention and operational approach thereof, espespecially one is applied to the sun
The DC-AC conversion equipment of photovoltaic generating system and operational approach thereof.
Background technology
Refer to Fig. 1 Yu Fig. 2 and be respectively the circuit diagram of prior art DC-AC power conversion system with straight
The block schematic diagram of the control circuit of stream alternating current power supply converting system.This DC-AC power conversion system system
Receive a DC input voitage Sdc, and change this DC input voitage Sdc and export into a three-phase alternating current
Voltage Sac.Specifically, this DC-AC power conversion system main body is this three-phase three-leg inverter.
As it is shown in figure 1, element numbers is a person, for a phase in three-phase；Element numbers is b person, for three-phase
In b phase；In like manner, element numbers is c person, for the c phase in three-phase.
Traditional three-phase three-leg inverter switch element quantity the most own is more, and wherein a phase at least makes
With four switch elements, as a example by a phase, use tetra-switch elements of Sa1, Sa2, Sa3 and Sa4.
Additionally, this three-phase three-leg inverter controls at corresponding signal control (as shown in Figure 2) and operated
, there is the shortcoming that leakage current is bigger in Cheng Zhong.
Therefore, how to design a kind of DC-AC conversion equipment and operational approach thereof, can be by simplifying one
The component of phase sequence, reaches the advantage of circuit reduction, and the operation of balancing circuitry of arranging in pairs or groups, accurately
Control the half equal to DC input voitage of the cross-pressure on direct current input side two electric capacity, can be greatly reduced
The impact of the caused leakage current of parasitic capacitor voltage, be intended to overcome and solve by inventor one
Big problem.
Summary of the invention
In order to solve the problems referred to above, the present invention provides a kind of DC-AC conversion equipment, knows skill to overcome
The problem of art.DC-AC conversion equipment the most of the present invention, is to change a direct-current input power supplying into one or three
Cross streams out-put supply.This DC-AC conversion equipment includes an input capacitance group, one first change-over circuit
And one second change-over circuit.This input capacitance group connects this direct-current input power supplying, has a neutral point；
Wherein this neutral point connects one first phase sequence of this three-phase alternating current out-put supply, to provide a first path.
This first change-over circuit includes one first brachium pontis and one second brachium pontis；Wherein this first brachium pontis has one first
Switch on the bridge unit and the one first bridge switch unit being connected in series this first switch on the bridge unit, and even
It is connected to one first junction point；This second brachium pontis has one second switch on the bridge unit and is connected in series this second
One second bridge switch unit of switch on the bridge unit, and it is connected to one second junction point；Wherein this first
Junction point connects one second phase sequence of this three-phase alternating current out-put supply, and to provide one second path, this is second years old
Junction point connects a third phase sequence of this three-phase alternating current out-put supply, to provide one the 3rd path.This is second years old
Change-over circuit includes one the 3rd brachium pontis and a four bridge legs；Wherein the 3rd brachium pontis has bridge on the 3rd and opens
One the 3rd bridge switch unit closing unit and be connected in series the 3rd switch on the bridge unit, has to be formed
One first end and one first tandem paths of one second end, and this first end connects this second path；This is years old
Four bridge legs has one the 4th switch on the bridge unit and be connected in series the 4th switch on the bridge unit one the 4th time
Bridge switch unit, has one second tandem paths of one first end and one second end to be formed, and this first
End system connects the 3rd path.Wherein this second end of this first tandem paths connects this second tandem paths
This second end, and reconnect this first path.This control circuit produces multiple control signals, controls respectively
Make this first change-over circuit and this second change-over circuit, be this three-phase alternating current to change this direct-current input power supplying
Out-put supply.
In order to solve the problems referred to above, the present invention provides the operational approach of a kind of DC-AC conversion equipment, with
Overcome the problem knowing technology.The operational approach of DC-AC conversion equipment the most of the present invention provides this direct current
AC conversion apparatus is to change a direct-current input power supplying into a three-phase alternating current out-put supply.This operational approach bag
Include the following step: (a) provides an input capacitance group, connect this direct-current input power supplying, and it is neutral to have one
Point；Wherein this neutral point connects one first phase sequence of this three-phase alternating current out-put supply, to provide a first via
Footpath；B () provides one first change-over circuit, including one first brachium pontis and one second brachium pontis；Wherein this first
Brachium pontis has one first switch on the bridge unit and the one first time bridge being connected in series this first switch on the bridge unit
Switch element, and it is connected to one first junction point；This second brachium pontis have one second switch on the bridge unit with
It is connected in series one second bridge switch unit of this second switch on the bridge unit, and is connected to one second connection
Point；Wherein this first junction point connects one second phase sequence of this three-phase alternating current out-put supply, to provide one
Two paths, this second junction point connects a third phase sequence of this three-phase alternating current out-put supply, to provide one
Three paths；C () provides one second change-over circuit, including one the 3rd brachium pontis and a four bridge legs；Wherein should
3rd brachium pontis has one the 3rd switch on the bridge unit and is connected in series the one the 3rd of the 3rd switch on the bridge unit
Bridge switch unit, has one first tandem paths of one first end and one second end to be formed, and this
One end connects this second path；This four bridge legs has one the 4th switch on the bridge unit and is connected in series this
One the 4th bridge switch unit of four switch on the bridge unit, has one first end and one second end to be formed
One second tandem paths, and this first end system connects the 3rd path；Wherein this first tandem paths should
Second end connects this second end of this second tandem paths, and reconnects this first path；And (d) provides
One control circuit, produces multiple control signal, controls this first change-over circuit and this second conversion electricity respectively
Road, is this three-phase alternating current out-put supply to change this direct-current input power supplying.
The DC-AC conversion equipment that the present invention is improved, can reach by simplifying the component of a phase sequence
Purpose to the quantity saving switch, outputting inductance group and output capacitance group.
In order to be able to be further understood that technology, means and effect that the present invention is taked by reaching predetermined purpose,
Refer to below in connection with detailed description of the invention and accompanying drawing, it is believed that the purpose of the present invention, feature and feature,
Go deep into and concrete understanding when can thus obtain one, but institute's accompanying drawings only provides with reference to and illustrate use, not
It is used for the present invention is any limitation as.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of prior art DC-AC power conversion system；
Fig. 2 is the block schematic diagram of the control circuit of prior art DC-AC power conversion system；
Fig. 3 is the circuit diagram of DC-AC conversion equipment preferred embodiment of the present invention；
Fig. 4 A is the block schematic diagram of the control circuit first embodiment of DC-AC conversion equipment of the present invention；
Fig. 4 B is the block schematic diagram of control circuit second embodiment of DC-AC conversion equipment of the present invention；
Fig. 5 is the circuit diagram of the control signal generation circuit of DC-AC conversion equipment of the present invention；
Fig. 6 is the waveform diagram of the control signal of DC-AC conversion equipment of the present invention；
Fig. 7 A is the electric current of the positive half cycle energy storage that DC-AC conversion device operation of the present invention switches in ab phase
Path schematic diagram；
Fig. 7 B is that DC-AC conversion device operation of the present invention releases the electric current of energy in the positive half cycle that ab phase switches
Path schematic diagram；
Fig. 7 C is the electric current of the negative half period energy storage that DC-AC conversion device operation of the present invention switches in ab phase
Path schematic diagram；
Fig. 7 D is that DC-AC conversion device operation of the present invention releases the electric current of energy in the negative half period that ab phase switches
Path schematic diagram；
Fig. 8 is the circuit diagram of DC-AC another preferred embodiment of conversion equipment of the present invention；And
Fig. 9 is the flow chart of DC-AC conversion device operation method of the present invention.
Wherein, description of reference numerals is as follows:
Sdc direct-current input power supplying
Sac three-phase alternating current out-put supply
Vp the first DC voltage
Vn the second DC voltage
10 input capacitance groups
11 first change-over circuits
12 second change-over circuits
101 first electric capacity
102 second electric capacity
111 first brachium pontis
112 second brachium pontis
123 the 3rd brachium pontis
124 four bridge legs
2 control circuits
20 control signals produce circuit
201 signals reverse unit
202 first anti-gate cells
203 second anti-gate cells
204 first comparing units
205 second comparing units
21 first arithmetic elements
22 second arithmetic elements
23 balancing circuitrys
231 the 3rd arithmetic elements
232 proportional plus integral control unit
24 the 4th arithmetic elements
25 the 5th arithmetic elements
30 output filter circuits
111U the first switch on the bridge unit
111L the first bridge switch unit
112U the second switch on the bridge unit
112L the second bridge switch unit
123U the 3rd switch on the bridge unit
123L the 3rd bridge switch unit
124U the 4th switch on the bridge unit
124L the 4th bridge switch unit
La1 the first inductance
Lc1 the second inductance
La2 the 3rd inductance
Lc2 the 4th inductance
Ca1 the first electric capacity
Cc1 the second electric capacity
Ca2 the 3rd electric capacity
Cc2 the 4th electric capacity
Po neutral point
P1 the first junction point
P2 the second junction point
Pth1 first path
Pth2 the second path
Pth3 the 3rd path
Ps1 the first tandem paths
Ps2 the second tandem paths
Ph1 the first phase sequence
Ph2 the second phase sequence
Ph3 third phase sequence
T11 the first tandem paths the first end
T12 the first tandem paths the second end
T21 the second tandem paths the first end
T22 the second tandem paths the second end
Va a phase voltage
Vb b phase voltage
Vc c phase voltage
Ia a phase current
Ib b phase current
Ic c phase current
Sa a phase signals
Sb b phase signals
Sc c phase signals
The alternate signal of Sab ab
The alternate signal of Scb cb
Sab ' ab alternate correction signal
Scb ' cb alternate correction signal
Stri triangle carrier signal
SA1First control signal
SA2Second control signal
SA33rd control signal
SA44th control signal
△ Spn voltage differential signal
Lps positive half cycle tank circuit
The positive half cycle of Lpr is released can loop
Lns negative half period tank circuit
Lnr negative half period is released can loop
T0～the t2 time
S10～S40 step
Cp1, Cp2 parasitic capacitance
Icp1, Icp2 leakage current
Detailed description of the invention
The technical content and a detailed description for the present invention, coordinate graphic being described as follows:
Refer to the circuit diagram that Fig. 3 is DC-AC conversion equipment preferred embodiment of the present invention.The present invention should
DC-AC conversion equipment is to change a direct-current input power supplying Sdc into a three-phase alternating current out-put supply Sac.
This DC-AC conversion equipment includes input capacitance group 10,1 first change-over circuit 11,1 second conversion
Circuit 12 and a control circuit 2.This input capacitance group 10 includes one first electric capacity 101 and one second
Electric capacity 102, this first electric capacity 101 and this second electric capacity 102 are connected in series and receive this direct current input electricity
Source Sdc.Wherein this first electric capacity 101 is connected to neutral point Po with this second electric capacity 102, to maintain
The cross-pressure of this first electric capacity 101 and the second electric capacity 102 is respectively equal to this direct-current input power supplying Sdc to be provided
The half of a DC input voitage.Wherein, these the first electric capacity 101 two ends across voltage swing be one
First DC voltage Vp；These the second electric capacity 102 two ends across voltage swing be one second DC voltage
Vn。
This three-phase alternating current out-put supply Sac has three phase sequences, respectively one first phase sequence Ph1, one
Two phase sequences Ph2 and third phase sequence Ph3.For convenience of explanation, with this first phase sequence Ph1 correspondence one
B phase voltage Vb, corresponding a phase voltage Va of this second phase sequence Ph2, and this third phase sequence Ph3 pair
Answer c phase voltage Vc.But, it is in full a three-phase with this three-phase alternating current out-put supply Sac due to this case
Illustrate as a example by balance electric source, therefore, the phase corresponding to three phase sequences of this three-phase alternating current out-put supply Sac
Voltage is not with above-described embodiment for limiting.Being worth mentioning, it is defeated that this neutral point Po connects this three-phase alternating current
Go out this first phase sequence Ph1 of power supply Sac, that is this neutral point Po connects this b phase voltage Vb, to carry
For first path Pth1.
This first change-over circuit 11 includes one first brachium pontis 111 and one second brachium pontis 112.Wherein this first
Brachium pontis 111 has one first switch on the bridge unit 111U and is connected in series this first switch on the bridge unit
The one first bridge switch unit 111L of 111U, and this first switch on the bridge unit 111U with this first
Bridge switch unit 111L is commonly connected to one first junction point P1.This second brachium pontis 112 has one
Two switch on the bridge unit 112U and the one second time bridge being connected in series this second switch on the bridge unit 112U are opened
Close unit 112L, and this second switch on the bridge unit 112U and this second bridge switch unit 112L is altogether
With being connected to one second junction point P2.Furthermore, this first junction point P1 connects this three-phase alternating current output electricity
This second phase sequence Ph2 of source Sac, that is this first junction point P1 connects this phase voltage Va, to carry
For one second path P th2.This second junction point P2 connect this three-phase alternating current out-put supply Sac this
Three phase sequences Ph3, that is this second junction point P2 connects this c phase voltage Vc, to provide one the 3rd path
Pth3。
This second change-over circuit 12 includes one the 3rd brachium pontis 123 and a four bridge legs 124.Wherein the 3rd
Brachium pontis 123 has one the 3rd switch on the bridge unit 123U and is connected in series the 3rd switch on the bridge unit
One the 3rd bridge switch unit 123L of 123U, has one first end T11 and one second end T12 to be formed
One first tandem paths Ps1, and this first end T11 connects this second path P th2.This four bridge legs
124 have one the 4th switch on the bridge unit 124U and are connected in series the 4th switch on the bridge unit 124U's
One the 4th bridge switch unit 124L, has one first end T21 and the one of one second end T22 to be formed
Second tandem paths Ps2, and this first end T21 connects the 3rd path P th3.Additionally, this first string
This second end T12 of connection path P s1 connects this second end T22 of this second tandem paths Ps2, and again
Connect this first path Pth1.
This control circuit 2 produces multiple control signal, control respectively this first change-over circuit 11 with this second
Change-over circuit 12, to reduce the leakage current that the parasitic capacitance effect of this DC input voitage is caused.
Be worth mentioning, in this DC-AC conversion equipment framework of this case, this first change-over circuit 11 this
One brachium pontis 111 is substantially to should the 3rd brachium pontis 123 of the second change-over circuit 12 configure, to should
The identical phase sequence of three-phase alternating current out-put supply Sac, for above-described embodiment, i.e. to should a phase voltage
The a phase brachium pontis framework of Va.In like manner, this second brachium pontis 112 of this first change-over circuit 11 is substantially
To should this four bridge legs 124 of the second change-over circuit 12 configure, to should three-phase alternating current out-put supply
The identical phase sequence of Sac, for above-described embodiment, i.e. to should the c phase brachium pontis framework of c phase voltage Vc.
Additionally, this DC-AC conversion equipment also includes an output filter circuit 30.This output filter circuit
30 include one first outputting inductance group, one second outputting inductance group, one first output capacitance group and 1
Two output capacitance groups.This first outputting inductance group includes one first electricity being connected in this second path P th2
Sense La1 and the one second inductance Lc1 being connected in the 3rd path P th3.This second outputting inductance group bag
Include one the 3rd inductance La2 that is connected in this second path P th2 and be connected in the 3rd path P th3
One the 4th inductance Lc2.Wherein this first inductance La1 is connected in series the 3rd inductance La2, and this is second years old
Inductance Lc1 is connected in series the 4th inductance Lc2.
This first output capacitance group includes one first electric capacity Ca1 and the company being connected in this second path P th2
The one second electric capacity Cc1 being connected in the 3rd path P th3.This second output capacitance group includes being connected to this
One the 3rd electric capacity Ca2 in second path P th2 and one the 4th electricity being connected in the 3rd path P th3
Hold Cc2.
In addition to the aforementioned circuit framework to the present invention proposes explanation, this circuit framework is also carried by the present invention
Go out the control strategy of correspondence.Refer to the control circuit that Fig. 4 A is DC-AC conversion equipment of the present invention
The block schematic diagram of one embodiment.
This case control strategy is controlled based on two alternate reference signals.It is described as follows:
As a example by the circuit framework shown in Fig. 3, that is, this first phase sequence Ph1 this b phase voltage Vb corresponding
Directly it is connected with this neutral point Po of direct current input side by this first path Pth1.Therefore, above-mentioned institute
Meaning refers to be different from based on two alternate reference signals knows the circuit framework of technology use with each phase
Signal Sa, based on Sb, Sc, under this case circuit framework, an an ab alternate signal Sab and cb is alternate
Signal Scb is converted to multiple control signal and is used (being detailed later) providing as reference signal.Wherein should
Ab alternate signal Sab is that a phase signals subtracts each other gained with b phase signals, that is, Sab=Sa-Sb；This cb
Alternate signal Scb is that c phase signals subtracts each other gained with b phase signals, that is, Scb=Sc-Sb.It follows that
If the circuit framework that this case is used is: this second phase sequence Ph2 this phase voltage Va corresponding is directly led to
Cross this second path P th2 when being connected with this neutral point Po of direct current input side, the reference signal used
It is then an a ba alternate signal Sba and ca alternate signal Sca.In like manner understand, if the electricity that this case is used
Road framework is: this third phase sequence Ph3 this c phase voltage Vc corresponding is directly by the 3rd path P th3
When being connected with this neutral point Po of direct current input side, the reference signal used is then an alternate signal of ac
A Sac and bc alternate signal Sbc.So, during the circuit framework difference used, relatively, just need
Coordinate corresponding alternate signal to provide this to be converted to multiple control signal as reference signal to be used.
Refer to Fig. 4 A again, this control framework will flow through the most respectively this second path P th2, this first
Path P th1 and an a phase current ia of the 3rd path P th3, a b phase current ib and a c phase
Electric current ic is through conversion, to produce every phase signals, that is, this phase signals Sa, this b phase signals Sb
And this c phase signals Sc.More specifically, this control framework of this case is by by this three-phase current ia, ib, ic
Carry out changing and computing in the way of biphase coordinate (d-q axle), to simplify the complexity of control flow, and
And again by biphase coordinates translation is returned three-phase coordinate, each phase signals, that is this so will be can get
Phase signals Sa, this b phase signals Sb and this c phase signals Sc.Owing to d-q axle switch technology is electric power
Coordinates translation technology common in system conversion, does not therefore repeat them here.
It is worth mentioning, under this circuit framework of this case, and non-immediate carries as reference signal using every phase signals
It is used for being converted to multiple control signal, but by this phase signals Sa with this b phase signals Sb with input
One first arithmetic element 21, performs this phase signals Sa by this first arithmetic element 21 and deducts this b phase
The computing of signal Sb, to produce this ab alternate signal Sab.In like manner, this c signal Sc believes with this b
Number Sb, to input one second arithmetic element 22, performs this c phase signals by this second arithmetic element 22
Sc deducts the computing of this b phase signals Sb, to produce this cb alternate signal Scb.So, obtained should
Ab alternate signal Sab and this cb alternate signal Scb inputs to a control signal generation circuit 20 again, and
And by carrying out computing with a triangle carrier signal Stri, to produce in order to control this first change-over circuit 11
Multiple control signals (being detailed later) with those switch elements of this second change-over circuit 12.
Refer to the square of control circuit the second embodiment that Fig. 4 B is DC-AC conversion equipment of the present invention
Schematic diagram.This second embodiment and the first embodiment maximum difference shown in Fig. 4 A are this control circuit 2
Also include balancing circuitry 23, the 4th arithmetic element 24 and one the 5th arithmetic element 25.This balance
Circuit 23 includes one the 3rd arithmetic element 231 and a proportional plus integral control unit (PI controller) 232.
3rd arithmetic element 231 receives this first DC voltage Vp and this second unidirectional current of direct current input side
Pressure Vn, performs this first DC voltage Vp by the 3rd arithmetic element 231 and deducts this second unidirectional current
The computing of pressure Vn, to produce the voltage difference between this two DC voltage.Further, then by this proportional integral
Control unit 232 carries out proportional integral computing to this voltage difference, to produce a stable voltage differential signal △
Spn。
4th arithmetic element 24 receives this ab alternate signal Sab and this voltage differential signal △ Spn, performs
This ab alternate signal Sab deducts the computing of this voltage differential signal △ Spn, to produce an alternate correction of ab
Signal Sab '.In like manner, the 5th arithmetic element 25 receives this cb alternate signal Scb and this voltage difference
Signal △ Spn, performs this cb alternate signal Scb and deducts the computing of this voltage differential signal △ Spn, to produce
A raw cb alternate correction signal Scb '.In other words, by this balancing circuitry 23 by this direct current input side
The voltage difference of this first DC voltage Vp and this second DC voltage Vn carry out computing and conversion after, institute
Produce this voltage differential signal △ Spn and be the compensation dosage of the balance between two voltages.And again by the 4th
Arithmetic element 24 and the calculating of the 5th arithmetic element 25, be bound to the alternate letter of this ab by this compensation dosage
Number Sab and this cb alternate signal Scb, this ab obtained alternate correction signal Sab ' is alternate with this cb
Revise signal Scb ' as reference signal, it is provided that multiple control signals of conversion gained are to this first conversion
Circuit 11 is controlled with this second change-over circuit 12, to maintain this first electric capacity 101 and this second electricity
Hold the cross-pressure of 102, that is this first DC voltage Vp is equal to more accurately with this second DC voltage Vn
The half of this DC input voitage.
Refer to the control signal that Fig. 5 is DC-AC conversion equipment of the present invention and produce the circuit diagram of circuit.
This control signal produces circuit 20 and includes an anti-gate cell 202, of signals reverse unit 201,1 first
Second anti-gate cell 203,1 first comparing unit 204 and one second comparing unit 205.This first ratio
Relatively unit 204 has an inverting input, a non-inverting input and an outfan.This is noninverting defeated
Entering end and receive an ab alternate signal Sab, this inverting input receives a triangle carrier signal Stri, and this is defeated
Go out end output one first control signal SA1.And this outfan connects this first anti-gate cell 202 with defeated
Go out one the 3rd control signal SA3.That is, this first control signal SA1With the 3rd control signal SA3For
The high frequency switching signal that level is complementary.Wherein this triangle carrier signal Stri is a high-frequency carrier signal.
This second comparing unit 205 has an inverting input, a non-inverting input and an outfan.
This non-inverting input connects this signals reverse unit 201 and receives this ab alternate signal Sab again, and this is anti-phase
Input receives this triangle carrier signal Stri, this outfan output one second control signal SA2.And should
Outfan connects this second anti-gate cell 203 to export one the 4th control signal SA4.That is, this is second years old
Control signal SA2With the 4th control signal SA4For the high frequency switching signal that level is complementary.
Being worth mentioning, this non-inverting input of this first comparing unit 204 above-mentioned receives an alternate letter of ab
Number Sab echoes in being initially mentioned: the circuit framework that this case is used is corresponding to this first phase sequence Ph1
This b phase voltage Vb is directly connected with this neutral point Po of direct current input side by this first path Pth1
Time, the reference signal used is then for this ab alternate signal Sab and this cb alternate signal Scb.Change speech
It, under this circuit framework, during to perform a circuitry phase switching control, this first comparing unit 204
This non-inverting input then receive this ab alternate signal Sab so that this control signal produce circuit 20
Those control signals S corresponding to generationA1～SA4.In like manner, under this circuit framework, to perform c
During circuitry phase switching control, it is alternate that this non-inverting input of this first comparing unit 204 then receives this cb
Signal Scb so that this control signal produces circuit 20 and produces those corresponding control signals SC1～SC4.
As for the operating instruction of this DC-AC conversion equipment, by hereinafter there being detailed elaboration.
Refer to the waveform diagram of the control signal that Fig. 6 is DC-AC conversion equipment of the present invention.Hold
Described, for convenience of explanation with explanation, Fig. 6 will be should corresponding to this first phase sequence Ph1 with circuit framework
B phase voltage Vb is directly connected with this neutral point Po of direct current input side by this first path Pth1, and
And to perform the reference signal that used of a circuitry phase switching control be to be said as a example by this ab alternate signal Sab
Bright.Specifically, this control signal produces circuit 20 is this ab alternate signal Sab according to reference signal
This first control signal S producedA1Control this first switch on the bridge unit of this first change-over circuit 11
111U, the 3rd control signal SA3Control the 3rd switch on the bridge unit of this second change-over circuit 12
123U, this second control signal SA2Control this first bridge switch unit of this first change-over circuit 11
111L and the 4th control signal SA4Control the 3rd bridge switch list of this second change-over circuit 12
Unit 123L.
Produce circuit 20 as this control signal to be produced by this cb alternate signal Scb according to reference signal
Those control signals SC1～SC4 control this second switch on the bridge of this first change-over circuit 11 with correspondence
On the 4th of unit 112U and this second bridge switch unit 112L and this second change-over circuit 12
Bridge switch unit 124U and the 4th bridge switch unit 124L.This part operation illustrates, due to action
Principle is little with execution a circuitry phase switching control difference, therefore refers to its explanation, does not repeats them here.
Referring to Fig. 6 again, when this alternate signal Sab is positive half cycle (time t0～t1 are interval), this is first years old
Control signal SA1Threeth control signal S complementary with levelA3For high frequency switching signal, this second control
Signal SA2It is a low level signal and the 4th control signal SA4It it is a high level signal.Wherein this
One control signal SA1With the 3rd control signal SA3For pulse width modulating signal (PWM signal).Value
Obtaining one to carry, the switching frequency (switching frequency) of this pulse width modulating signal carries equal to this triangle
The frequency of ripple signal Stri.
(time t1～t2 is interval), this second control signal S when this alternate signal Sab is negative half periodA2With
The 4th control signal S that level is complementaryA4For high frequency switching signal, this first control signal SA1It is one low
Level signal and the 3rd control signal SA3It it is a high level signal.Wherein this second control signal SA2
With the 4th control signal SA4For pulse width modulating signal (PWM signal).It is worth mentioning, this pulse
The switching frequency (switching frequency) of the bandwidth modulation signals frequency equal to this triangle carrier signal Stri
Rate.
Referring to Fig. 7 A is the positive half cycle energy storage that DC-AC conversion device operation of the present invention switches in ab phase
Current path schematic diagram.Under this alternate signal Sab is the operation of positive half cycle, this first control signal SA1
For high frequency switched conductive this first switch on the bridge unit 111U, the 3rd control signal SA3High frequency switching cuts
Only the 3rd switch on the bridge unit 123U, this second control signal SA2End this first bridge switch unit
111L and the 4th control signal SA4Turn on the 3rd bridge switch unit 123L, and this first electricity
Sense La1 and the 3rd inductance La2 is stored energy operation, and therefore, this DC-AC conversion equipment is just providing one
Half cycle tank circuit Lps be sequentially this direct-current input power supplying Sdc, this first switch on the bridge unit 111U,
This first inductance La1, the 3rd inductance La2, this phase voltage Va, this b phase voltage Vb, this neutrality
Point Po, this second electric capacity 102, return this direct-current input power supplying Sdc.
The positive half cycle switched in ab phase release can current path schematic diagram.When this alternate signal Sab is just half
Under week operation, this first control signal SA1For high frequency switching cut-off this first switch on the bridge unit 111U,
3rd control signal SA3High frequency switched conductive the 3rd switch on the bridge unit 123U, this second control letter
Number SA2End this first bridge switch unit 111L and the 4th control signal SA4Turn on the 3rd time
Bridge switch unit 123L, and this first inductance La1 and the 3rd inductance La2 can operate for releasing, therefore,
This DC-AC conversion equipment provides a positive half cycle to release and can be sequentially this first inductance La1, is somebody's turn to do by loop Lpr
3rd inductance La2, this phase voltage Va, this b phase voltage Vb, the 3rd bridge switch unit 123L,
3rd switch on the bridge unit 123U, returns this first inductance La1.
Referring to Fig. 7 C is the negative half period energy storage that DC-AC conversion device operation of the present invention switches in ab phase
Current path schematic diagram.Under alternate signal Sab is negative half period operation, this second control signal SA2
For high frequency switched conductive this first bridge switch unit 111L, the 4th control signal SA4High frequency switching cuts
Only the 3rd bridge switch unit 123L, this first control signal SA1End this first switch on the bridge unit
111U and the 3rd control signal SA3Turn on the 3rd switch on the bridge unit 123U, and this first
Inductance La1 and the 3rd inductance La2 is stored energy operation, and therefore, this DC-AC conversion equipment provides one
Negative half period tank circuit Lns is sequentially this direct-current input power supplying Sdc, this first electric capacity 101, this neutral point
Po, this b phase voltage Vb, this phase voltage Va, the 3rd inductance La2, this first inductance La1, should
First bridge switch unit 111L, returns this direct-current input power supplying Sdc.
Referring to Fig. 7 D is that the negative half period that DC-AC conversion device operation of the present invention switches in ab phase releases energy
Current path schematic diagram.Under alternate signal Sab is negative half period operation, this second control signal SA2
For high frequency switching cut-off this first bridge switch unit 111L, the 4th control signal SA4High frequency switching is led
Logical 3rd bridge switch unit 123L, this first control signal SA1End this first switch on the bridge unit
111U and the 3rd control signal SA3Turn on the 3rd switch on the bridge unit 123U, and this first
Inductance La1 and the 3rd inductance La2 can operate for releasing, and therefore, this DC-AC conversion equipment provides one
Negative half period is released can loop Lnr be sequentially the 3rd inductance La2, this first inductance La1, bridge is opened on the 3rd
Close unit 123U, the 3rd bridge switch unit 123L, this b phase voltage Vb, this phase voltage Va,
Return the 3rd inductance La2.
Refer to the circuit diagram that Fig. 8 is DC-AC another preferred embodiment of conversion equipment of the present invention.Fig. 8
The circuit topography of this DC-AC conversion equipment shown is substantially identical with this preferred embodiment shown in Fig. 3,
In other words, element or the unit of the identical label of Fig. 8 with Fig. 3 are substantially the same, therefore by this another relatively
The circuit of good embodiment, can reach circuit function as indicated in fig. 3 and effect equally.Should as Fig. 8
The operating instruction of circuit does not repeats them here, can be corresponding refering to Fig. 3 itself and the elaboration of description.
Refer to the flow chart that Fig. 9 is DC-AC conversion device operation method of the present invention.This DC-AC
Conversion equipment is to change a direct-current input power supplying into a three-phase alternating current out-put supply.Under this operational approach includes
Row step: first, it is provided that an input capacitance group, connects this direct-current input power supplying, and has a neutral point；
Wherein this neutral point connects one first phase sequence of this three-phase alternating current out-put supply, to provide a first path
(S10).Wherein this input capacitance group includes one first electric capacity and one second electric capacity, this first electric capacity with this
Two capacitances in series connect and receive this direct-current input power supplying.Wherein this first electric capacity is connected with this second electric capacity
In this neutral point, to maintain the cross-pressure of this first electric capacity and the second electric capacity to be respectively equal to this direct-current input power supplying
The half of the DC input voitage provided.Wherein, these the first electric capacity two ends across voltage swing be
One first DC voltage；These the second electric capacity two ends across voltage swing be one second DC voltage.
Then, it is provided that one first change-over circuit, including one first brachium pontis and one second brachium pontis；Wherein this
One brachium pontis has one first switch on the bridge unit and be connected in series this first switch on the bridge unit one first time
Bridge switch unit, and it is connected to one first junction point；This second brachium pontis has one second switch on the bridge unit
Be connected in series one second bridge switch unit of this second switch on the bridge unit, and be connected to one second even
Contact；Wherein this first junction point connects one second phase sequence of this three-phase alternating current out-put supply, to provide one
Second path, this second junction point connects a third phase sequence of this three-phase alternating current out-put supply, to provide one
3rd path (S20).
Then, it is provided that one second change-over circuit, including one the 3rd brachium pontis and a four bridge legs；Wherein this
Three brachium pontis have one the 3rd switch on the bridge unit and be connected in series the 3rd switch on the bridge unit one the 3rd time
Bridge switch unit, has one first tandem paths of one first end and one second end to be formed, and this first
End connects this second path；This four bridge legs has one the 4th switch on the bridge unit and is connected in series the 4th
One the 4th bridge switch unit of switch on the bridge unit, has one first end and the one of one second end to be formed
Second tandem paths, and this first end connects the 3rd path；Wherein this first tandem paths this second
End connects this second end of this second tandem paths, and reconnects this first path (S30).
Finally, it is provided that a control circuit, produce multiple control signal, control this first change-over circuit respectively
With this second change-over circuit, it is this three-phase alternating current out-put supply stream (S40) to change this direct-current input power supplying.
Additionally, this operational approach also includes providing an output filter circuit.This output filter circuit includes one
First outputting inductance group, one second outputting inductance group, one first output capacitance group and one second output electricity
Appearance group.This first outputting inductance group includes one first inductance being connected on this second path and is connected to this
One second inductance on 3rd path.This second outputting inductance group includes be connected on this second path one
3rd inductance and one the 4th inductance being connected on the 3rd path.Wherein this first inductance is connected in series this
3rd inductance, this second inductance is connected in series the 4th inductance.
This first output capacitance group includes one first electric capacity being connected on this second path and is connected to this
One second electric capacity on three paths.This second output capacitance group includes one be connected on this second path
Three electric capacity and one the 4th electric capacity being connected on the 3rd path.
Furthermore, control circuit also includes a balancing circuitry, one the 4th arithmetic element and one the 5th computing list
Unit.This balancing circuitry includes one the 3rd arithmetic element and a proportional plus integral control unit.3rd computing list
Unit receives this first DC voltage and this second DC voltage, perform this first DC voltage deduct this second
The computing of DC voltage, to produce a voltage difference.This proportional plus integral control unit receives this voltage difference, holds
The proportional integral computing of this voltage difference of row, to produce a voltage differential signal.4th arithmetic element receives should
The alternate signal of ab and this voltage differential signal, perform the alternate signal of this ab and deduct this voltage differential signal, to produce
A raw ab alternate correction signal.5th arithmetic element receives the alternate signal of this cb and this voltage differential signal,
Perform the alternate signal of this cb and deduct this voltage differential signal, to produce a cb alternate correction signal.Wherein should
Ab alternate correction signal and this cb alternate correction signal produce circuit to input this control signal, to produce
Those control signals, it is provided that conversion gained multiple control signals to this first change-over circuit with this second turn
Change circuit to be controlled, to maintain the cross-pressure of this first electric capacity and this second electric capacity, that is this first direct current
Voltage and this second DC voltage are more accurately equal to the half of this DC input voitage.
In sum, the present invention has following feature and an advantage:
1, the DC-AC conversion equipment that the present invention is improved is utilized, can be by simplifying the circuit elements of a phase sequence
Part, reaches to save switch, outputting inductance group and the quantity of output capacitance group；And
2, by the design of this first change-over circuit Yu this second change-over circuit, it is achieved this outputting inductance group
Energy storage can operate with releasing, and the operation of this balancing circuitry 23 of arranging in pairs or groups, by this direct current input side this first
After the voltage difference of DC voltage Vp and this second DC voltage Vn carries out computing and changes, produced this electricity
Pressure difference signal △ Spn is the compensation dosage of the balance between two voltages, to maintain this first electric capacity 101 and to be somebody's turn to do
The cross-pressure of the second electric capacity 102, that is this first DC voltage Vp is more accurate with this second DC voltage Vn
Ground, equal to the half of this DC input voitage, so can be greatly reduced the caused leakage of parasitic capacitor voltage
The impact of electric current.
The above, the detailed description of preferred embodiment the most of the present invention with graphic, the spy of the present invention
Levying and be not limited thereto, and be not used to limit the present invention, all scopes of the present invention should be with following right
Claimed range is as the criterion, the embodiment of all spirit changes similar with it meeting the claims in the present invention, all should
It is included in scope of the invention, any is familiar with the personnel of this technology in the field of the invention, can be light
Easily think and change or modify and all can contain the scope of the claims in following this case.
Claims (20)
1. a DC-AC conversion equipment, to change a direct-current input power supplying into a three-phase alternating current output electricity
Source；It is characterized in that, this DC-AC conversion equipment includes:
One input capacitance group, connects this direct-current input power supplying, and has a neutral point；Wherein this neutral point
Connect one first phase sequence of this three-phase alternating current out-put supply, to provide a first path；
One first change-over circuit, including one first brachium pontis and one second brachium pontis；Wherein this first brachium pontis has
One first switch on the bridge unit and the one first bridge switch list being connected in series this first switch on the bridge unit
Unit, and it is connected to one first junction point；This second brachium pontis has one second switch on the bridge unit and the company of series connection
Connect one second bridge switch unit of this second switch on the bridge unit, and be connected to one second junction point；Its
In this first junction point connect one second phase sequence of this three-phase alternating current out-put supply, to provide one second path,
This second junction point connects a third phase sequence of this three-phase alternating current out-put supply, to provide one the 3rd path；
One second change-over circuit, including one the 3rd brachium pontis and a four bridge legs；Wherein the 3rd brachium pontis has
One the 3rd switch on the bridge unit and one the 3rd bridge switch list being connected in series the 3rd switch on the bridge unit
Unit, to form one first tandem paths with one first end and one second end, and the connection of this first end should
Second path；This four bridge legs has one the 4th switch on the bridge unit and is connected in series the 4th switch on the bridge
One the 4th bridge switch unit of unit, to form one second series connection with one first end and one second end
Path, and this first end connects the 3rd path；Wherein this second end connection of this first tandem paths should
This second end of second tandem paths, and reconnect this first path；And
One control circuit, produces multiple control signal, control respectively this first change-over circuit with this second turn
Change circuit, be this three-phase alternating current out-put supply to change this direct-current input power supplying.
2. DC-AC conversion equipment as claimed in claim 1, it is characterised in that also include:
One output filter circuit, including:
One first outputting inductance group, including one first inductance being connected on this second path be connected to this
One second inductance on 3rd path；
One second outputting inductance group, including one the 3rd inductance being connected on this second path be connected to this
One the 4th inductance on 3rd path；Wherein this first inductance is connected in series the 3rd inductance, this second electricity
Sense is connected in series the 4th inductance；
One first output capacitance group, including one first electric capacity being connected on this second path be connected to this
One second electric capacity on 3rd path；And
One second output capacitance group, including one the 3rd electric capacity being connected on this second path be connected to this
One the 4th electric capacity on 3rd path.
3. DC-AC conversion equipment as claimed in claim 2, it is characterised in that this control circuit is extremely
Including that a control signal produces circuit less, this control signal produces circuit and includes:
One signals reverse unit；
One first anti-gate cell；
One second anti-gate cell；
One first comparing unit, has an inverting input, a non-inverting input and an outfan；
This non-inverting input receives an alternate signal, and this inverting input receives a triangle carrier signal；This is defeated
Go out end output one first control signal, and this outfan connects this first anti-gate cell with output one the 3rd
Control signal；Wherein this triangle carrier signal is a high-frequency carrier signal；And
One second comparing unit, has an inverting input, a non-inverting input and an outfan；
This non-inverting input connects this signals reverse unit and receives this alternate signal again, and this inverting input receives
This triangle carrier signal；This outfan output one second control signal, and this outfan connect this second
Anti-gate cell is to export one the 4th control signal.
4. DC-AC conversion equipment as claimed in claim 3, it is characterised in that when this exchange exports
When alternate power supply is positive half cycle, this first control signal is high frequency with the 3rd control signal of level complementation
Switching signal, this second control signal are a low level signal and the 4th control signal is a high level
Signal；This exchange exports alternate power supply when being negative half period, this complementary with level of this second control signal the
Four control signals be high frequency switching signal, this first control signal be a low level signal and the 3rd control
Signal processed is a high level signal.
5. DC-AC conversion equipment as claimed in claim 4, it is characterised in that when this three-phase alternating current
Exporting alternate power supply is the operation of positive half cycle, this this first switch on the bridge of the first control signal high frequency switched conductive
Unit, the 3rd control signal high frequency switching cut-off the 3rd switch on the bridge unit, this second control signal
End this first bridge switch unit and time the 4th control signal turns on the 3rd bridge switch unit,
This first inductance and the 3rd inductance are stored energy operation, and this DC-AC conversion equipment provides a positive half cycle storage
Can loop be sequentially this direct-current input power supplying, this first switch on the bridge unit, this first inductance, the 3rd
Inductance, a phase voltage of this three-phase alternating current out-put supply, the b phase voltage of this three-phase alternating current out-put supply,
This neutral point and this second electric capacity are constituted.
6. DC-AC conversion equipment as claimed in claim 4, it is characterised in that when this three-phase alternating current
Exporting alternate power supply is the operation of positive half cycle, this first control signal be high frequency switching cut-off this on first bridge open
Close unit, the 3rd control signal high frequency switched conductive the 3rd switch on the bridge unit, this second control letter
Number ending this first bridge switch unit and the 4th control signal turns on the 3rd bridge switch unit
Time, this first inductance and the 3rd inductance can operate for releasing, and this DC-AC conversion equipment offer one is just partly
Release in week can loop be sequentially this first inductance, the 3rd inductance, this three-phase alternating current out-put supply a phase electric
Bridge on pressure, the b phase voltage of this three-phase alternating current out-put supply, the 3rd bridge switch unit and the 3rd
Switch element is constituted.
7. DC-AC conversion equipment as claimed in claim 4, it is characterised in that when this three-phase alternating current
Exporting alternate power supply is negative half period operation, and this second control signal is that this first time bridge of high frequency switched conductive is opened
Close unit, the 4th control signal high frequency switching cut-off the 3rd bridge switch unit, this first control letter
Number ending this first switch on the bridge unit and the 3rd control signal turns on the 3rd switch on the bridge unit
Time, this first inductance and the 3rd inductance are stored energy operation, and this DC-AC conversion equipment provides one negative half
Week tank circuit to be sequentially this direct-current input power supplying, this first electric capacity, this neutral point, this three-phase alternating current defeated
Go out the b phase voltage of power supply, a phase voltage of this three-phase alternating current out-put supply, the 3rd inductance, this first
Inductance and this first bridge switch unit are constituted.
8. DC-AC conversion equipment as claimed in claim 4, it is characterised in that when this three-phase alternating current
Exporting alternate power supply is negative half period operation, and this second control signal is that high frequency switching this first time bridge of cut-off is opened
Close unit, the 4th control signal high frequency switched conductive the 3rd bridge switch unit, this first control letter
Number ending this first switch on the bridge unit and the 3rd control signal turns on the 3rd switch on the bridge unit
Time, this first inductance and the 3rd inductance can operate for releasing, this DC-AC conversion equipment provide one negative partly
Release in week can loop be sequentially the 3rd inductance, this first inductance, the 3rd switch on the bridge unit, the 3rd
Bridge switch unit, the b phase voltage of this three-phase alternating current out-put supply and this three-phase alternating current out-put supply
A phase voltage is constituted.
9. DC-AC conversion equipment as claimed in claim 3, it is characterised in that this alternate signal by
Each phase signals subtracts each other generation；The one alternate signal of ab be an a phase signals deduct one b phase signals produce, one
The alternate signal of cb is that a c phase signals deducts the generation of this b phase signals.
10. the DC-AC conversion equipment as described in claim 9, it is characterised in that this control electricity
Road also includes:
One balancing circuitry, including:
One the 3rd arithmetic element, receives this first DC voltage and this second DC voltage, perform this first
DC voltage deducts the computing of this second DC voltage, to produce a voltage difference；And
One proportional plus integral control unit, receives this voltage difference, performs the proportional integral computing of this voltage difference,
To produce a voltage differential signal；
One the 4th arithmetic element, receives the alternate signal of this ab and this voltage differential signal, performs this ab alternate
Signal deducts this voltage differential signal, to produce an ab alternate correction signal；And
One the 5th arithmetic element, receives the alternate signal of this cb and this voltage differential signal, performs this cb alternate
Signal deducts this voltage differential signal, to produce a cb alternate correction signal；
Wherein this ab alternate correction signal and this cb alternate correction signal produce electricity to input this control signal
Road, to produce described control signal.
The operational approach of 11. 1 kinds of DC-AC conversion equipments, this DC-AC conversion equipment is to change one
Direct-current input power supplying is a three-phase alternating current out-put supply, it is characterised in that this operational approach includes following step
Rapid:
A () provides an input capacitance group, connect this direct-current input power supplying, and have a neutral point；Wherein
This neutral point connects one first phase sequence of this three-phase alternating current out-put supply, to provide a first path；
B () provides one first change-over circuit, including one first brachium pontis and one second brachium pontis；Wherein this first
Brachium pontis has one first switch on the bridge unit and the one first time bridge being connected in series this first switch on the bridge unit
Switch element, and it is connected to one first junction point；This second brachium pontis have one second switch on the bridge unit with
It is connected in series one second bridge switch unit of this second switch on the bridge unit, and is connected to one second connection
Point；Wherein this first junction point connects one second phase sequence of this three-phase alternating current out-put supply, to provide one
Two paths, this second junction point connects a third phase sequence of this three-phase alternating current out-put supply, to provide one
Three paths；
C () provides one second change-over circuit, including one the 3rd brachium pontis and a four bridge legs；Wherein the 3rd
Brachium pontis has one the 3rd switch on the bridge unit and one the 3rd time bridge being connected in series the 3rd switch on the bridge unit
Switch element, to form one first tandem paths with one first end and one second end, and this first end
Connect this second path；This four bridge legs has one the 4th switch on the bridge unit and is connected in series on the 4th
One the 4th bridge switch unit of bridge switch unit, has the one the of one first end and one second end to be formed
Two tandem paths, and this first end connects the 3rd path；Wherein this second end of this first tandem paths
Connect this second end of this second tandem paths, and reconnect this first path；And
D () provides a control circuit, produce multiple control signal, control respectively this first change-over circuit with
This second change-over circuit, is this three-phase alternating current out-put supply to change this direct-current input power supplying.
The operational approach of 12. DC-AC conversion equipments as claimed in claim 11, it is characterised in that
Also include:
One output filter circuit is provided, including:
One first outputting inductance group, including one first inductance being connected on this second path be connected to this
One second inductance on 3rd path；
One second outputting inductance group, including one the 3rd inductance being connected on this second path be connected to this
One the 4th inductance on 3rd path；Wherein this first inductance is connected in series the 3rd inductance, this second electricity
Sense is connected in series the 4th inductance；
One first output capacitance group, including one first electric capacity being connected on this second path be connected to this
One second electric capacity on 3rd path；And
One second output capacitance group, including one the 3rd electric capacity being connected on this second path be connected to this
One the 4th electric capacity on 3rd path.
The operational approach of 13. DC-AC conversion equipments as claimed in claim 12, it is characterised in that
This control circuit at least includes that a control signal produces circuit, and this control signal produces circuit and includes:
One signals reverse unit；
One first anti-gate cell；
One second anti-gate cell；
One first comparing unit, has an inverting input, a non-inverting input and an outfan；
This non-inverting input receives an alternate signal, and this inverting input receives a triangle carrier signal；This is defeated
Go out end output one first control signal, and this outfan connects this first anti-gate cell with output one the 3rd
Control signal；Wherein this triangle carrier signal is a high-frequency carrier signal；And
One second comparing unit, has an inverting input, a non-inverting input and an outfan；
This non-inverting input connects this signals reverse unit and receives this alternate signal again, and this inverting input receives
This triangle carrier signal；This outfan output one second control signal, and this outfan connect this second
Anti-gate cell is to export one the 4th control signal.
The operational approach of 14. DC-AC conversion equipments as claimed in claim 13, it is characterised in that
When this exchange alternate power supply of output is positive half cycle, the 3rd control that this first control signal is complementary with level
Signal processed be high frequency switching signal, this second control signal be that a low level signal and the 4th controls letter
Number it is a high level signal；When this exchange alternate power supply of output is negative half period, this second control signal and electricity
The 4th flat complementary control signal be high frequency switching signal, this first control signal be a low level signal
And the 3rd control signal be a high level signal.
The operational approach of 15. DC-AC conversion equipments as claimed in claim 14, it is characterised in that
Being the operation of positive half cycle when this three-phase alternating current exports alternate power supply, this first control signal high frequency switched conductive should
First switch on the bridge unit, the 3rd control signal high frequency switching end the 3rd switch on the bridge unit, are somebody's turn to do
Second control signal ends this first bridge switch unit and the 4th control signal turns on the 3rd time bridge
During switch element, this first inductance and the 3rd inductance are stored energy operation, and this DC-AC conversion equipment carries
For a positive half cycle tank circuit be sequentially this direct-current input power supplying, this first switch on the bridge unit, this first
Inductance, the 3rd inductance, a phase voltage of this three-phase alternating current out-put supply, this three-phase alternating current out-put supply
B phase voltage, this neutral point and this second electric capacity constituted.
The operational approach of 16. DC-AC conversion equipments as claimed in claim 14, it is characterised in that
Being the operation of positive half cycle when this three-phase alternating current exports alternate power supply, this first control signal is high frequency switching cut-off
This first switch on the bridge unit, the 3rd control signal high frequency switched conductive the 3rd switch on the bridge unit,
This second control signal ends this first bridge switch unit and the 4th control signal turns on the 3rd time
During bridge switch unit, this first inductance and the 3rd inductance can operate for releasing, this DC-AC conversion equipment
There is provided a positive half cycle to release and can be sequentially this first inductance, the 3rd inductance, this three-phase alternating current output electricity in loop
The a phase voltage in source, the b phase voltage of this three-phase alternating current out-put supply, the 3rd bridge switch unit and
3rd switch on the bridge unit is constituted.
The operational approach of 17. DC-AC conversion equipments as claimed in claim 14, it is characterised in that
Being negative half period operation when this three-phase alternating current exports alternate power supply, this second control signal is high frequency switched conductive
This first bridge switch unit, the 4th control signal high frequency switching cut-off the 3rd bridge switch unit,
This first control signal ends this first switch on the bridge unit and the 3rd control signal turns on the 3rd
During bridge switch unit, this first inductance and the 3rd inductance are stored energy operation, this DC-AC conversion equipment
A negative half period tank circuit is provided to be sequentially this direct-current input power supplying, this first electric capacity, this neutral point, be somebody's turn to do
The b phase voltage of three-phase alternating current out-put supply, a phase voltage of this three-phase alternating current out-put supply, the 3rd electricity
Sense, this first inductance and this first bridge switch unit are constituted.
The operational approach of 18. DC-AC conversion equipments as claimed in claim 14, it is characterised in that
Being negative half period operation when this three-phase alternating current exports alternate power supply, this second control signal is high frequency switching cut-off
This first bridge switch unit, the 4th control signal high frequency switched conductive the 3rd bridge switch unit,
This first control signal ends this first switch on the bridge unit and the 3rd control signal turns on the 3rd
During bridge switch unit, this first inductance and the 3rd inductance can operate for releasing, this DC-AC conversion equipment
There is provided a negative half period to release and can be sequentially the 3rd inductance, this first inductance, the 3rd switch on the bridge list in loop
Unit, the 3rd bridge switch unit, the b phase voltage of this three-phase alternating current out-put supply and this three-phase alternating current
The a phase voltage of out-put supply is constituted.
The operational approach of 19. DC-AC conversion equipments as claimed in claim 13, it is characterised in that
This alternate signal is subtracted each other generation by each phase signals；The one alternate signal of ab is that an a phase signals deducts a b and believes
Number produce, an alternate signal of cb be a c phase signals deduct this b phase signals produce.
The operational approach of 20. DC-AC conversion equipments as claimed in claim 19, it is characterised in that
This control circuit also includes:
One balancing circuitry, including:
One the 3rd arithmetic element, receives this first DC voltage and this second DC voltage, perform this first
DC voltage deducts the computing of this second DC voltage, to produce a voltage difference；And
One proportional plus integral control unit, receives this voltage difference, performs the proportional integral computing of this voltage difference,
To produce a voltage differential signal；
One the 4th arithmetic element, receives the alternate signal of this ab and this voltage differential signal, performs this ab alternate
Signal deducts this voltage differential signal, to produce an ab alternate correction signal；And
One the 5th arithmetic element, receives the alternate signal of this cb and this voltage differential signal, performs this cb alternate
Signal deducts this voltage differential signal, to produce a cb alternate correction signal；
Wherein this ab alternate correction signal and this cb alternate correction signal produce electricity to input this control signal
Road, to produce described control signal.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108574422A (en) * | 2017-03-13 | 2018-09-25 | 台达电子工业股份有限公司 | Power supply changeover device and power conversion method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108574422A (en) * | 2017-03-13 | 2018-09-25 | 台达电子工业股份有限公司 | Power supply changeover device and power conversion method |
| CN108574422B (en) * | 2017-03-13 | 2020-04-28 | 台达电子工业股份有限公司 | Power converter and power conversion method |
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