CN105991058B - DC communication conversion equipment and its operating method - Google Patents
DC communication conversion equipment and its operating method Download PDFInfo
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- CN105991058B CN105991058B CN201510044911.9A CN201510044911A CN105991058B CN 105991058 B CN105991058 B CN 105991058B CN 201510044911 A CN201510044911 A CN 201510044911A CN 105991058 B CN105991058 B CN 105991058B
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Abstract
A kind of DC communication conversion equipment and its operating method, the DC communication conversion equipment convert direct-current input power supplying as three-phase alternating current out-put supply.DC communication conversion equipment includes input capacitance group, the first conversion circuit, the second conversion circuit and control circuit.Input capacitance group connects direct-current input power supplying, has neutral point；Wherein the first phase sequence of neutral point connection three-phase alternating current out-put supply.First conversion circuit connects the second phase sequence and third phase sequence of three-phase alternating current out-put supply.The first phase sequence, the second phase sequence and the third phase sequence of second conversion circuit connection three-phase alternating current out-put supply.Control circuit generates multiple control signal, the first conversion circuit and the second conversion circuit is controlled respectively, to convert direct-current input power supplying as three-phase alternating current out-put supply.The DC communication conversion equipment that the present invention is improved can achieve the purpose that the quantity for saving switch, outputting inductance group and output capacitance group by the circuit element of a simplified phase sequence.
Description
Technical field
The present invention is espespecially a kind of to be applied to solar photovoltaic generating in relation to a kind of DC communication conversion equipment and its operating method
The DC communication conversion equipment and its operating method of system.
Background technique
It please refers to Fig. 1 and Fig. 2 is respectively the circuit diagram and DC communication electricity of prior art DC communication power conversion system
The block schematic diagram of the control circuit of source converting system.The DC communication power conversion system system receives a DC input voitage
Sdc, and DC input voitage Sdc is converted as a three-phase alternating current output voltage Sac.Specifically, the DC communication power supply
Converting system main body is the three-phase three-leg inverter.As shown in Figure 1, element numbers are a person, it is a phase in three-phase；Element mark
Number be b person, be three-phase in b phase；Similarly, element numbers are c person, are the c phase in three-phase.
Not only switch element quantity itself is more for traditional three-phase three-leg inverter, wherein a phase is at least opened using four
It closes element and uses tetra- switch elements of Sa1, Sa2, Sa3 and Sa4 by taking a phase as an example.In addition, the three-phase three-leg inverter exists
Corresponding signal control control (as shown in Figure 2) haves the shortcomings that leakage current is larger with operating process.
Therefore, a kind of DC communication conversion equipment and its operating method how are designed, the electricity for simplifying a phase sequence can be passed through
Circuit component, reaches the advantage of circuit reduction, and the operation for balancing circuitry of arranging in pairs or groups, and accurately controls on two capacitor of direct current input side
Cross-pressure be equal to DC input voitage half, will can greatly reduce the influence of leakage current caused by parasitic capacitor voltage, be
Inventor is intended to the big project for overcoming and solving.
Summary of the invention
To solve the above-mentioned problems, the present invention provides a kind of DC communication conversion equipment, with technology known to overcoming the problems, such as.
Therefore DC communication conversion equipment of the present invention, is to convert a direct-current input power supplying as a three-phase alternating current out-put supply.The direct current
AC conversion apparatus includes an input capacitance group, one first conversion circuit and one second conversion circuit.The input capacitance group connects
The direct-current input power supplying is connect, there is a neutral point；Wherein the neutral point connects one first phase sequence of the three-phase alternating current out-put supply,
To provide a first path.First conversion circuit includes one first bridge arm and one second bridge arm；Wherein first bridge arm has
One first switch on the bridge unit and the one first bridge switch unit that the first switch on the bridge unit is connected in series, and it is connected to one
First tie point；Second bridge arm has one second switch on the bridge unit and is connected in series the one the of the second switch on the bridge unit
Two bridge switch units, and it is connected to one second tie point；Wherein first tie point connects the three-phase alternating current out-put supply
One second phase sequence, to provide one second path, which connects a third phase sequence of the three-phase alternating current out-put supply, with
One third path is provided.Second conversion circuit includes a third bridge arm and a four bridge legs；Wherein the third bridge arm has one
Third switch on the bridge unit and the third bridge switch unit that the third switch on the bridge unit is connected in series have one to be formed
One first tandem paths of first end and a second end, and the first end connects second path；The four bridge legs have one the
Four switch on the bridge units and one the 4th bridge switch unit that the 4th switch on the bridge unit is connected in series have one the to be formed
One second tandem paths of one end and a second end, and the first end system connects the third path.Wherein first tandem paths
The second end connect the second end of second tandem paths, and reconnect the first path.The control circuit generates multiple
Signal is controlled, controls first conversion circuit and second conversion circuit respectively, to convert the direct-current input power supplying as the three-phase
Exchange out-put supply.
To solve the above-mentioned problems, the present invention provides a kind of operating method of DC communication conversion equipment, known to overcoming
The problem of technology.Therefore the operating method of DC communication conversion equipment of the present invention provides the DC communication conversion equipment to convert one
Direct-current input power supplying is a three-phase alternating current out-put supply.The operating method includes the following steps: that (a) provides an input capacitance group,
The direct-current input power supplying is connected, and there is a neutral point；Wherein the neutral point connects the one first of the three-phase alternating current out-put supply
Phase sequence, to provide a first path；(b) one first conversion circuit, including one first bridge arm and one second bridge arm are provided；Wherein should
First bridge arm has one first switch on the bridge unit and one first bridge switch list of the first switch on the bridge unit is connected in series
Member, and it is connected to one first tie point；Second bridge arm has one second switch on the bridge unit and the bridge on second is connected in series
One second bridge switch unit of switch unit, and it is connected to one second tie point；Wherein first tie point connects the three-phase
One second phase sequence of out-put supply is exchanged, to provide one second path, which connects the three-phase alternating current out-put supply
A third phase sequence, to provide a third path；(c) one second conversion circuit, including a third bridge arm and one the 4th bridge are provided
Arm；Wherein the third bridge arm has a third switch on the bridge unit and is connected in series under a third of the third switch on the bridge unit
Bridge switch unit, with formed have a first end and a second end one first tandem paths, and the first end connect this second
Path；The four bridge legs have one the 4th switch on the bridge unit and one the 4th lower bridge of the 4th switch on the bridge unit are connected in series
Switch unit, to form one second tandem paths with a first end and a second end, and the first end system connects the third
Path；Wherein the second end of first tandem paths connects the second end of second tandem paths, and reconnect this first
Path；And a control circuit (d) is provided, multiple control signal is generated, controls first conversion circuit and second conversion respectively
Circuit, to convert the direct-current input power supplying as the three-phase alternating current out-put supply.
The DC communication conversion equipment that the present invention is improved can be reached saving and be opened by the circuit element of a simplified phase sequence
The purpose of the quantity of pass, outputting inductance group and output capacitance group.
In order to be further understood that the present invention to reach technology, means and effect that predetermined purpose is taken, please refers to
Following detailed descriptions and accompanying drawings of the present invention, it is believed that the purpose of the present invention, feature and feature, when can thus one deeply and
It is specific to understand, however institute's accompanying drawings are only for reference and description, and are not intended to limit the present invention.
Detailed description of the invention
Fig. 1 is the circuit diagram of prior art DC communication power conversion system；
Fig. 2 is the block schematic diagram of the control circuit of prior art DC communication power conversion system；
Fig. 3 is the circuit diagram of DC communication conversion equipment preferred embodiment of the present invention；
Fig. 4 A is the block schematic diagram of the control circuit first embodiment of DC communication conversion equipment of the present invention；
Fig. 4 B is the block schematic diagram of the control circuit second embodiment of DC communication conversion equipment of the present invention；
Fig. 5 is the circuit diagram of the control signal generating circuit of DC communication conversion equipment of the present invention；
Fig. 6 is the waveform diagram of the control signal of DC communication conversion equipment of the present invention；
Fig. 7 A is the current path signal for the positive half cycle energy storage that DC communication conversion device operation of the present invention switches in ab phase
Figure；
Fig. 7 B is the current path signal that DC communication conversion device operation of the present invention releases energy in the positive half cycle that ab phase switches
Figure；
Fig. 7 C is the current path signal for the negative half period energy storage that DC communication conversion device operation of the present invention switches in ab phase
Figure；
Fig. 7 D is the current path signal that DC communication conversion device operation of the present invention releases energy in the negative half period that ab phase switches
Figure；
Fig. 8 is the circuit diagram of DC communication conversion equipment another preferred embodiment of the present invention；And
Fig. 9 is the flow chart of DC communication conversion device operation method of the present invention.
Wherein, the reference numerals are as follows:
Sdc direct-current input power supplying
Sac three-phase alternating current out-put supply
The first DC voltage of Vp
The second DC voltage of Vn
10 input capacitance groups
11 first conversion circuits
12 second conversion circuits
101 first capacitors
102 second capacitors
111 first bridge arms
112 second bridge arms
123 third bridge arms
124 four bridge legs
2 control circuits
20 control signal generating circuits
The reversed unit of 201 signals
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 third arithmetic elements
232 proportional plus integral control units
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 third switch on the bridge unit
123L third bridge switch unit
The 4th switch on the bridge unit of 124U
The 4th bridge switch unit of 124L
The first inductance of La1
The second inductance of Lc1
La2 third inductance
The 4th inductance of Lc2
Ca1 first capacitor
The second capacitor of Cc1
Ca2 third capacitor
The 4th capacitor of Cc2
Po neutral point
The first tie point of P1
The second tie point of P2
Pth1 first path
The second path Pth2
Pth3 third path
The first tandem paths of Ps1
The second tandem paths of Ps2
The first phase sequence of Ph1
The second phase sequence of Ph2
Ph3 third phase sequence
T11 the first tandem paths first end
T12 the first tandem paths second end
T21 the second tandem paths first end
T22 the second tandem paths 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
The alternate revise signal of Sab ' ab
The alternate revise signal of Scb ' cb
Stri triangle carrier signal
SA1First control signal
SA2Second control signal
SA3Third controls signal
SA44th control signal
△ Spn voltage differential signal
Lps positive half cycle tank circuit
Lpr positive half cycle is released can circuit
Lns negative half period tank circuit
Lnr negative half period is released can circuit
T0~t2 time
S10~S40 step
Cp1, Cp2 parasitic capacitance
Icp1, Icp2 leakage current
Specific embodiment
The technical content and a detailed description for the present invention, cooperation schema are described as follows:
Please refer to the circuit diagram that Fig. 3 is DC communication conversion equipment preferred embodiment of the present invention.The present invention DC communication
Conversion equipment is to convert a direct-current input power supplying Sdc as a three-phase alternating current out-put supply Sac.The DC communication conversion equipment packet
Include an input capacitance group 10, one first conversion circuit 11, one second conversion circuit 12 and a control circuit 2.The input capacitance
Group 10 includes a first capacitor 101 and one second capacitor 102, which is connected in series and connects with second capacitor 102
Receive direct-current input power supplying Sdc.Wherein the first capacitor 101 and second capacitor 102 are connected to a neutral point Po, to maintain to be somebody's turn to do
The cross-pressure of first capacitor 101 and the second capacitor 102 is respectively equal to a DC input voitage provided by direct-current input power supplying Sdc
Half.Wherein, 101 both ends of first capacitor across voltage swing be one first DC voltage Vp；102 liang of second capacitor
End institute across voltage swing be one second DC voltage Vn.
Three-phase alternating current out-put supply Sac tool there are three phase sequence, respectively one first phase sequence Ph1, one second phase sequence Ph2 with
An and third phase sequence Ph3.For convenience of explanation, with the corresponding b phase voltage Vb of the first phase sequence Ph1, the second phase sequence Ph2 is corresponding
The corresponding c phase voltage Vc of the one a phase voltage Va and third phase sequence Ph3.However, since this case full text is defeated with the three-phase alternating current
Power supply Sac is illustrates out for a three-phase equilibrium power supply, therefore, corresponding to three phase sequences of three-phase alternating current out-put supply Sac
Phase voltage not with above-described embodiment be limitation.It is worth mentioning, neutral point Po connects three-phase alternating current out-put supply Sac's
First phase sequence Ph1, that is, neutral point Po connects the b phase voltage Vb, to provide a first path Pth1.
First conversion circuit 11 includes one first bridge arm 111 and one second bridge arm 112.Wherein first bridge arm 111 has
There is one first switch on the bridge unit 111U and the one first bridge switch unit of the first switch on the bridge unit 111U is connected in series
111L, and the first switch on the bridge unit 111U and the first bridge switch unit 111L are commonly connected to one first tie point
P1.Second bridge arm 112 has one second switch on the bridge unit 112U and is connected in series the second switch on the bridge unit 112U's
One second bridge switch unit 112L, and the second switch on the bridge unit 112U and the second bridge switch unit 112L connects jointly
It is connected to one second tie point P2.Furthermore first tie point P1 connects second phase sequence of three-phase alternating current out-put supply Sac
Ph2, that is, first tie point P1 connects a phase voltage Va, to provide one second path P th2.Second tie point P2 connection
The third phase sequence Ph3 of three-phase alternating current out-put supply Sac, that is, second tie point P2 connects the c phase voltage Vc, to provide
One third path P th3.
Second conversion circuit 12 includes a third bridge arm 123 and a four bridge legs 124.Wherein the third bridge arm 123 has
There is a third switch on the bridge unit 123U and a third bridge switch unit of third switch on the bridge unit 123U is connected in series
123L, to form the one first tandem paths Ps1 with an a first end T11 and second end T12, and first end T11 connection
Second path P th2.There is the four bridge legs 124 one the 4th switch on the bridge unit 124U to open with bridge on the 4th is connected in series
One the 4th bridge switch unit 124L of unit 124U is closed, to form one second with an a first end T21 and second end T22
Tandem paths Ps2, and first end T21 connects third path P th3.In addition, the second end of first tandem paths Ps1
T12 connects the second end T22 of second tandem paths Ps2, and reconnects first path Pth1.
The control circuit 2 generates multiple control signal, controls first conversion circuit 11 and second conversion circuit respectively
12, leakage current caused by the parasitic capacitance effect to reduce the DC input voitage.
It is worth mentioning, in this case DC communication conversion equipment framework, first bridge arm 111 of first conversion circuit 11
Substantially correspond to the third bridge arm 123 configuration of second conversion circuit 12, the phase of corresponding three-phase alternating current out-put supply Sac
Same phase sequence corresponds to a phase bridge arm framework of a phase voltage Va for above-described embodiment.Similarly, first conversion circuit 11
Second bridge arm 112 be substantially corresponding second conversion circuit 12 the four bridge legs 124 configuration, the corresponding three-phase alternating current
The identical phase sequence of out-put supply Sac corresponds to the c phase bridge arm framework of c phase voltage Vc for above-described embodiment.
In addition, the DC communication conversion equipment further includes an output filter circuit 30.The output filter circuit 30 includes one
First outputting inductance group, one second outputting inductance group, one first output capacitance group and one second output capacitance group.This is first defeated
Out inductance group include one first inductance La1 being connected on second path P th2 be connected on third path P th3 one
Second inductance Lc1.The second outputting inductance group includes the third inductance La2 being connected on second path P th2 and be connected to
One the 4th inductance Lc2 on third path P th3.Wherein third inductance La2 is connected in series in first inductance La1, this second
The 4th inductance Lc2 is connected in series in inductance Lc1.
The first output capacitance group include the first capacitor Ca1 being connected on second path P th2 and be connected to this
One second capacitor Cc1 on three path P th3.The second output capacitance group includes one be connected on second path P th2
Three capacitor Ca2 and one the 4th capacitor Cc2 being connected on third path P th3.
In addition to it is aforementioned explanation is proposed to circuit framework of the invention other than, the present invention also proposes the circuit framework corresponding
Control strategy.Please refer to the block schematic diagram for the control circuit first embodiment that Fig. 4 A is DC communication conversion equipment of the present invention.
This case control strategy is controlled based on two alternate reference signals.It is described as follows: shown in Fig. 3
Circuit framework for, also that is, b phase voltage Vb corresponding to first phase sequence Ph1 directly passes through first path Pth1 and straight
Flow the neutral point Po connection of input side.Therefore, it is above-mentioned it is so-called referred to based on two alternate reference signals be different from it is known
The circuit framework that technology uses is with each phase signals Sa, based on Sb, Sc, under this case circuit framework, and the alternate signal Sab of an ab
Signal Scb alternate with a cb is used and (is detailed later) to be converted to multiple control signal as reference signal offer.The wherein ab
Alternate signal Sab is that a phase signals and b phase signals subtract each other gained, also that is, Sab=Sa-Sb；The alternate signal Scb of the cb believes for c
Number with b phase signals subtract each other gained, also that is, Scb=Sc-Sb.It follows that if circuit framework used by this case are as follows: this second
When a phase voltage Va corresponding to phase sequence Ph2 directly passes through the second path P th2 and connect with the neutral point Po of direct current input side,
Used reference signal is then the alternate signal Sba of ba signal Sca alternate with a ca.Similarly it is found that if used by this case
Circuit framework are as follows: c phase voltage Vc corresponding to third phase sequence Ph3 directly passes through the third path P th3 and direct current input side
When neutral point Po connection, used reference signal is then the alternate signal Sac of ac signal Sbc alternate with a bc.So institute
When the circuit framework difference of use, relatively, it is necessary to corresponding alternate signal be cooperated to provide the conversion as reference signal
It is used for multiple control signal.
Please refer to Fig. 4 A again, the control framework will mainly flow through respectively second path P th2, first path Pth1 with
And an a phase current ia, a b phase current ib and the c phase current ic process conversion of third path P th3, often believed with generating
Number, also that is, a phase signals Sa, the b phase signals Sb and c phase signals Sc.More specifically, this case control framework passes through
The three-phase current ia, ib, ic are carried out to conversion and operation in a manner of two-phase coordinate (d-q axis), with simplified control process
Complexity, and each phase signals will so can be obtained, that is, a believes by the way that two-phase coordinates translation is returned three-phase coordinate again
Number Sa, the b phase signals Sb and c phase signals Sc.Since d-q axis switch technology is that coordinate common in electric system conversion turns
Technology is changed, therefore details are not described herein.
It is worth mentioning, under this case circuit framework, and indirect provided using every phase signals as reference signal is converted to
Multiple control signal is used, but by a phase signals Sa and the b phase signals Sb to input one first arithmetic element 21, by this
First arithmetic element 21 executes the operation that a phase signals Sa subtracts b phase signals Sb, to generate the alternate signal Sab of the ab.Together
Reason, c signal Sc and the b phase signals Sb execute the c phase to input one second arithmetic element 22, by second arithmetic element 22
Signal Sc subtracts the operation of b phase signals Sb, to generate the alternate signal Scb of the cb.So the alternate signal Sab of the acquired ab
Signal Scb alternate with the cb is input to a control signal generating circuit 20 again, and by with a triangle carrier signal Stri into
Row operation, to generate multiple controls of those switch units to control first conversion circuit 11 and second conversion circuit 12
Signal (being detailed later) processed.
Please refer to the block schematic diagram for the control circuit second embodiment that Fig. 4 B is DC communication conversion equipment of the present invention.It should
Second embodiment is that the control circuit 2 further includes a balancing circuitry 23, one with first embodiment maximum difference shown in Fig. 4 A
4th arithmetic element 24 and one the 5th arithmetic element 25.The balancing circuitry 23 includes a third arithmetic element 231 and a ratio
Integral control unit (PI controller) 232.First direct current of the third arithmetic element 231 reception direct current input side
Vp and second DC voltage Vn are pressed, executing first DC voltage Vp by the third arithmetic element 231, to subtract this second straight
Galvanic electricity presses the operation of Vn, to generate the voltage difference between two DC voltage.Also, pass through the proportional plus integral control unit 232 again
Proportional integration operation is carried out to the voltage difference, to generate a stable voltage differential signal △ Spn.
4th arithmetic element 24 receives the ab alternate signal Sab and voltage differential signal △ Spn, executes the alternate letter of the ab
Number Sab subtracts the operation of voltage differential signal △ Spn, to generate the alternate revise signal Sab ' of an ab.Similarly, the 5th operation list
Member 25 receives the cb alternate signal Scb and voltage differential signal △ Spn, executes the alternate signal Scb of the cb and subtracts voltage difference letter
The operation of number △ Spn, to generate the alternate revise signal Scb ' of a cb.In other words, the direct current is inputted by the balancing circuitry 23
After the voltage difference of the first DC voltage Vp and second DC voltage Vn of side carry out operation and conversion, the produced voltage difference
Signal △ Spn is the compensation rate of the balance between two voltages.And pass through the 4th arithmetic element 24 and the 5th operation again
The compensation rate is bound to the alternate signal Sab of ab signal Scb alternate with the cb by the calculating of unit 25, and the acquired ab is alternate
Revise signal Sab ' revise signal Scb ' alternate with the cb is used as reference signal, provides the resulting multiple control signal of conversion to this
First conversion circuit 11 is controlled with second conversion circuit 12, to maintain the first capacitor 101 and second capacitor 102
Cross-pressure, that is, the first DC voltage Vp and second DC voltage Vn are more accurately equal to the half of the DC input voitage.
Please refer to the circuit diagram for the control signal generating circuit that Fig. 5 is DC communication conversion equipment of the present invention.Control letter
Number generation circuit 20 includes the reversed unit 201 of a signal, one first anti-gate cell 202, one second anti-gate cell 203, one first
Comparing unit 204 and one second comparing unit 205.First comparing unit 204 has an inverting input terminal, one noninverting defeated
Enter end and an output end.The non-inverting input receives the alternate signal Sab of an ab, which receives a triangular carrier
Signal Stri, the output end export a first control signal SA1.And the output end connects the first anti-gate cell 202 to export
One third controls signal SA3.Also that is, first control signal SA1Signal S is controlled with the thirdA3Switch for the high frequency of level complementation
Signal.Wherein triangle carrier signal Stri is a high-frequency carrier signal.
Second comparing unit 205 has an inverting input terminal, a non-inverting input and an output end.This is noninverting
Input terminal connects the reversed unit 201 of the signal and receives the alternate signal Sab of the ab again, which receives triangular carrier letter
Number Stri, the output end export a second control signal SA2.And the output end connects the second anti-gate cell 203 to export one
4th control signal SA4.Also that is, second control signal SA2With the 4th control signal SA4Switch letter for the high frequency of level complementation
Number.
It is worth mentioning, the non-inverting input of above-mentioned first comparing unit 204 receives the alternate signal Sab of an ab and echoes
In being initially mentioned: circuit framework used by this case be b phase voltage Vb corresponding to first phase sequence Ph1 directly pass through this
When one path Pth1 is connect with the neutral point Po of direct current input side, used reference signal is then the alternate signal Sab of the ab
Signal Scb alternate with the cb.In other words, under this circuit framework, when to execute the switching control of a circuitry phase, this first compares
The non-inverting input of unit 204 then receives the alternate signal Sab of the ab, so that the control signal generating circuit 20 generation institute is right
Those controls signal S answeredA1~SA4.Similarly, under this circuit framework, when to execute the switching control of c circuitry phase, this first
The non-inverting input of comparing unit 204 then receives the alternate signal Scb of the cb, so that the control signal generating circuit 20 generates
Corresponding those controls signal SC1~SC4.It, will be detailed in having hereinafter as the operating instruction of the DC communication conversion equipment
Elaboration.
Please refer to the waveform diagram for the control signal that Fig. 6 is DC communication conversion equipment of the present invention.From the above, in order to
Facilitate explanation and explain, Fig. 6 will with circuit framework be first phase sequence Ph1 corresponding to b phase voltage Vb directly pass through this first
Path P th1 is connect with the neutral point Po of direct current input side, and executes reference signal used in a circuitry phase switching control
To be illustrated for the alternate signal Sab of the ab.Specifically, the control signal generating circuit 20 is the ab according to reference signal
First control signal S caused by alternate signal SabA1Control the first switch on the bridge unit of first conversion circuit 11
111U, the third control signal SA3Control third switch on the bridge unit 123U, second control of second conversion circuit 12
Signal SA2Control the control of the first bridge switch unit 111L and the 4th signal S of first conversion circuit 11A4Control should
The third bridge switch unit 123L of second conversion circuit 12.
As for the control signal generating circuit 20 according to reference signal be the alternate signal Scb of the cb caused by those control
Signal SC1~SC4 is opened with corresponding the second switch on the bridge unit 112U for controlling first conversion circuit 11 and the second lower bridge
Close unit 112L and the 4th switch on the bridge unit 124U and the 4th bridge switch unit of second conversion circuit 12
124L.Part operation explanation can refer to its and say since operating principle and execution a circuitry phase switching control difference are little
Bright, details are not described herein.
Again referring to Fig. 6, when the alternate signal Sab is positive half cycle (time t0~section t1), the first control signal
SA1The third complementary with level controls signal SA3For high frequency switching signal, second control signal SA2For a low level signal
And the 4th control signal SA4For a high level signal.Wherein first control signal SA1Signal S is controlled with the thirdA3For
Pulse width modulating signal (PWM signal).It is worth mentioning, the switching frequency (switching of the pulse width modulating signal
Frequency) it is equal to the frequency of triangle carrier signal Stri.
When the alternate signal Sab is negative half period (time t1~t2 section), second control signal SA2It is complementary with level
The 4th control signal SA4For high frequency switching signal, first control signal SA1For a low level signal and the third control
Signal S processedA3For a high level signal.Wherein second control signal SA2With the 4th control signal SA4For pulse width modulation
Signal (PWM signal).It is worth mentioning, switching frequency (switching frequency) of the pulse width modulating signal etc.
In the frequency of triangle carrier signal Stri.
Please refer to the electric current road that Fig. 7 A is the positive half cycle energy storage that DC communication conversion device operation of the present invention switches in ab phase
Diameter schematic diagram.When the alternate signal Sab is first control signal S under positive half cycle operationA1For high frequency switched conductive this on first
Bridge switch unit 111U, the third control signal SA3High frequency switching cut-off third switch on the bridge unit 123U, second control
Signal SA2End the control of the first bridge switch unit 111L and the 4th signal SA4The third bridge switch unit is connected
123L, and the first inductance La1 and third inductance La2 is stored energy operation, and therefore, which provides one
Positive half cycle tank circuit Lps is sequentially direct-current input power supplying Sdc, the first switch on the bridge unit 111U, first inductance
It is straight to return this by La1, third inductance La2, a phase voltage Va, b phase voltage Vb, neutral point Po, second capacitor 102
Flow input power Sdc.
The current path schematic diagram of energy is released in the positive half cycle that ab phase switches.Under the alternate signal Sab operates for positive half cycle,
First control signal SA1Switch cut-off the first switch on the bridge unit 111U for high frequency, the third controls signal SA3High frequency is cut
Change conducting third switch on the bridge unit 123U, second control signal SA2End the first bridge switch unit 111L and is somebody's turn to do
4th control signal SA4Third bridge switch unit 123L is connected, and the first inductance La1 and third inductance La2 is to release
Can operation, therefore, the DC communication conversion equipment provide a positive half cycle release can circuit Lpr be sequentially first inductance La1, this
Three inductance La2, a phase voltage Va, b phase voltage Vb, third bridge switch unit 123L, the third switch on the bridge unit
123U returns first inductance La1.
Please refer to the electric current road that Fig. 7 C is the negative half period energy storage that DC communication conversion device operation of the present invention switches in ab phase
Diameter schematic diagram.When alternate signal Sab is second control signal S under negative half period operationA2For the high frequency switched conductive first lower bridge
Switch unit 111L, the 4th control signal SA4High frequency switching cut-off third bridge switch unit 123L, the first control letter
Number SA1End the first switch on the bridge unit 111U and third control signal SA3The third switch on the bridge unit is connected
123U, and the first inductance La1 and third inductance La2 is stored energy operation, and therefore, which provides one
Negative half period tank circuit Lns is sequentially direct-current input power supplying Sdc, the first capacitor 101, neutral point Po, the b phase voltage
It is straight to return this by Vb, a phase voltage Va, third inductance La2, first inductance La1, first bridge switch unit 111L
Flow input power Sdc.
Please referring to Fig. 7 D is the electric current road that DC communication conversion device operation of the present invention releases energy in the negative half period that ab phase switches
Diameter schematic diagram.When alternate signal Sab is second control signal S under negative half period operationA2For the high frequency switching cut-off first lower bridge
Switch unit 111L, the 4th control signal SA4High frequency switched conductive third bridge switch unit 123L, the first control letter
Number SA1End the first switch on the bridge unit 111U and third control signal SA3The third switch on the bridge unit is connected
123U, and the first inductance La1 and third inductance La2 is to release and can operate, and therefore, which provides one
Negative half period releases energy circuit Lnr and is sequentially third inductance La2, first inductance La1, third switch on the bridge unit 123U, is somebody's turn to do
Third bridge switch unit 123L, b phase voltage Vb, a phase voltage Va, return third inductance La2.
Please refer to the circuit diagram that Fig. 8 is DC communication conversion equipment another preferred embodiment of the present invention.The direct current shown in Fig. 8
The circuit topography of AC conversion apparatus is substantially identical as the preferred embodiment shown in Fig. 3, in other words, Fig. 8 label identical as Fig. 3
Element or unit it is substantially the same, therefore by the circuit of the another preferred embodiment, equally can reach as indicated in fig. 3
Circuit function and effect.As for the operating instruction of Fig. 8 circuit, details are not described herein, can correspond to refering in Fig. 3 itself and specification
The elaboration of appearance.
Please refer to the flow chart that Fig. 9 is DC communication conversion device operation method of the present invention.The DC communication conversion equipment
To convert a direct-current input power supplying as a three-phase alternating current out-put supply.The operating method includes the following steps: firstly, to provide one defeated
Enter capacitance group, connects the direct-current input power supplying, and there is a neutral point；Wherein the neutral point connects the three-phase alternating current out-put supply
One first phase sequence, to provide a first path (S10).Wherein the input capacitance group includes a first capacitor and one second electricity
Hold, the first capacitor and second capacitor are connected in series and receive the direct-current input power supplying.Wherein the first capacitor and this second
Capacitance connection is mentioned in the neutral point with maintaining the cross-pressure of the first capacitor and the second capacitor to be respectively equal to the direct-current input power supplying
The half of the DC input voitage supplied.Wherein, the first capacitor both ends across voltage swing be one first DC voltage；It should
Second capacitor both ends across voltage swing be one second DC voltage.
Then, one first conversion circuit, including one first bridge arm and one second bridge arm are provided；Wherein first bridge arm has
One first switch on the bridge unit and the one first bridge switch unit that the first switch on the bridge unit is connected in series, and it is connected to one
First tie point；Second bridge arm has one second switch on the bridge unit and is connected in series the one the of the second switch on the bridge unit
Two bridge switch units, and it is connected to one second tie point；Wherein first tie point connects the three-phase alternating current out-put supply
One second phase sequence, to provide one second path, which connects a third phase sequence of the three-phase alternating current out-put supply, with
One third path (S20) is provided.
Then, one second conversion circuit, including a third bridge arm and a four bridge legs are provided；Wherein the third bridge arm has
One third switch on the bridge unit and the third bridge switch unit that the third switch on the bridge unit is connected in series, have to be formed
One first tandem paths of one first end and a second end, and the first end connects second path；The four bridge legs have one
4th switch on the bridge unit and one the 4th bridge switch unit that the 4th switch on the bridge unit is connected in series have one to be formed
One second tandem paths of first end and a second end, and the first end connects the third path；Wherein first tandem paths
The second end connect the second end of second tandem paths, and reconnect the first path (S30).
Finally, providing a control circuit, multiple control signal is generated, controls first conversion circuit and this second turn respectively
Circuit is changed, to convert the direct-current input power supplying as the three-phase alternating current out-put supply stream (S40).
In addition, the operating method further includes providing an output filter circuit.The output filter circuit includes one first output
Inductance group, one second outputting inductance group, one first output capacitance group and one second output capacitance group.The first outputting inductance group
Including one first inductance being connected on second path and one second inductance being connected on the third path.Second output
Inductance group includes the third inductance being connected on second path and one the 4th inductance being connected on the third path.Wherein
The third inductance is connected in series in first inductance, which is connected in series the 4th inductance.
The first output capacitance group includes the first capacitor being connected on second path and is connected to the third path
On one second capacitor.The second output capacitance group include the third capacitor being connected on second path and be connected to this
One the 4th capacitor on three paths.
Furthermore control circuit further includes a balancing circuitry, one the 4th arithmetic element and one the 5th arithmetic element.The balance
Circuit includes a third arithmetic element and a proportional plus integral control unit.The third arithmetic element receive first DC voltage with
Second DC voltage executes the operation that first DC voltage subtracts second DC voltage, to generate a voltage difference.This ratio
Example integral control unit receives the voltage difference, the proportional integration operation of the voltage difference is executed, to generate a voltage differential signal.This
Four arithmetic elements receive the alternate signal of the ab and the voltage differential signal, execute the alternate signal of the ab and subtract the voltage differential signal, with
Generate the alternate revise signal of an ab.5th arithmetic element receives the alternate signal of the cb and the voltage differential signal, executes the cb phase
Between signal subtract the voltage differential signal, to generate the alternate revise signal of a cb.Wherein the alternate revise signal of the ab is alternate with the cb
Revise signal is to input the control signal generating circuit, to generate those control signals, provides conversion resulting multiple control letters
Number first conversion circuit and second conversion circuit are controlled, with maintain the first capacitor and second capacitor across
Pressure, that is, first DC voltage and second DC voltage are more accurately equal to the half of the DC input voitage.
In conclusion the present invention has features and advantages below:
1, the DC communication conversion equipment improved using the present invention can be reached by the circuit element of a simplified phase sequence
Save the quantity of switch, outputting inductance group and output capacitance group；And
2, it by the design of first conversion circuit and second conversion circuit, realizes the energy storage of the outputting inductance group and releases
Can operation, and the operation for the balancing circuitry 23 of arranging in pairs or groups, by the first DC voltage Vp of the direct current input side and this is second straight
After galvanic electricity presses the voltage difference of Vn to carry out operation and conversion, produced voltage differential signal △ Spn is the balance between two voltages
Compensation rate, to maintain the cross-pressure of the first capacitor 101 and second capacitor 102, that is, the first DC voltage Vp and this second
DC voltage Vn is more accurately equal to the half of the DC input voitage, can so greatly reduce parasitic capacitor voltage and be made
At the influence of leakage current.
The above, the detailed description and schema of preferred embodiment only of the present invention, feature of the invention not office
It is limited to this, is not intended to limit the invention, all ranges of the invention should be subject to following scopes of the claims, all to meet this
The embodiment of spirit variation similar with its of invention claim, should all be included in scope of the invention, any to be familiar with this
The personnel of technology within the field of the present invention, can think easily and changes or modifications can all cover patent model in following this case
It encloses.
Claims (18)
1. a kind of DC communication conversion equipment, to convert a direct-current input power supplying as a three-phase alternating current out-put supply；Its feature exists
In the DC communication conversion equipment includes:
One input capacitance group connects the direct-current input power supplying, and has a neutral point；Wherein the neutral point connects the three-phase alternating current
One first phase sequence of out-put supply, to provide a first path；
One first conversion circuit, including one first bridge arm and one second bridge arm；Wherein there is first bridge arm bridge on one first to open
It closes unit and one first bridge switch unit of the first switch on the bridge unit is connected in series, and be connected to one first tie point；
Second bridge arm has one second switch on the bridge unit and one second bridge switch of the second switch on the bridge unit is connected in series
Unit, and it is connected to one second tie point；Wherein first tie point connects one second phase sequence of the three-phase alternating current out-put supply,
To provide one second path, which connects a third phase sequence of the three-phase alternating current out-put supply, to provide a third
Path；
One second conversion circuit, including a third bridge arm and a four bridge legs；Wherein there is the third bridge arm bridge in a third to open
It closes unit and a third bridge switch unit of the third switch on the bridge unit is connected in series, there is a first end and one to be formed
One first tandem paths of second end, and the first end connects second path；The four bridge legs have one the 4th switch on the bridge
Unit and one the 4th bridge switch unit that the 4th switch on the bridge unit is connected in series have a first end and one the to be formed
One second tandem paths at two ends, and the first end connects the third path；Wherein the second end of first tandem paths connects
The second end of second tandem paths is connect, and reconnects the first path；And
One control circuit generates multiple control signal according to an alternate signal, control respectively first conversion circuit and this second
Conversion circuit, with convert the direct-current input power supplying be the three-phase alternating current out-put supply,
Wherein, which subtracts each other generation by each phase signals；The alternate signal of one ab is that an a phase signals subtract b phase signals production
Raw, the alternate signal of a cb is that a c phase signals subtract b phase signals generation.
2. DC communication conversion equipment as described in claim 1, which is characterized in that further include:
One output filter circuit, comprising:
One first outputting inductance group including one first inductance being connected on second path and is connected on the third path
One second inductance；
One second outputting inductance group including the third inductance being connected on second path and is connected on the third path
One the 4th inductance；Wherein the third inductance is connected in series in first inductance, which is connected in series the 4th inductance；
One first output capacitance group including the first capacitor being connected on second path and is connected on the third path
One second capacitor；And
One second output capacitance group including the third capacitor being connected on second path and is connected on the third path
One the 4th capacitor.
3. DC communication conversion equipment as claimed in claim 2, which is characterized in that the control circuit includes at least a control letter
Number generation circuit, the control signal generating circuit include:
The reversed unit of one signal；
One first anti-gate cell；
One second anti-gate cell；
One first comparing unit has an inverting input terminal, a non-inverting input and an output end；The non-inverting input
The alternate signal is received, which receives a triangle carrier signal；The output end exports a first control signal, and
The output end connects the first anti-gate cell to export third control signal；Wherein the triangle carrier signal is a high frequency carrier
Signal；And
One second comparing unit has an inverting input terminal, a non-inverting input and an output end；The non-inverting input
It connects the reversed unit of the signal and receives the alternate signal again, which receives the triangle carrier signal；The output end is defeated
A second control signal out, and the output end connects the second anti-gate cell to export one the 4th control signal.
4. DC communication conversion equipment as claimed in claim 3, which is characterized in that be positive partly when the exchange exports alternate power supply
Zhou Shi, the first control signal third control signal complementary with level is high frequency switching signal, the second control signal is
One low level signal and the 4th control signal are a high level signal；It, should when the alternate power supply of exchange output is negative half period
The second control signal fourth control signal complementary with level is high frequency switching signal, the first control signal is a low level
Signal and third control signal are a high level signal.
5. DC communication conversion equipment as claimed in claim 4, which is characterized in that be when the three-phase alternating current exports alternate power supply
Positive half cycle operation, the first control signal high frequency switched conductive the first switch on the bridge unit, third control signal high frequency are cut
It changes and ends the third switch on the bridge unit, the second control signal and end the first bridge switch unit and the 4th control letter
When number the third bridge switch unit is connected, first inductance and the third inductance are stored energy operation, the DC communication converting means
Set provide a positive half cycle tank circuit be sequentially the direct-current input power supplying, the first switch on the bridge unit, first inductance, this
Three inductance, a phase voltage of the three-phase alternating current out-put supply, the b phase voltage of the three-phase alternating current out-put supply, the neutral point and should
Second capacitor is constituted.
6. DC communication conversion equipment as claimed in claim 4, which is characterized in that be when the three-phase alternating current exports alternate power supply
Positive half cycle operation, the first control signal are that high frequency switching ends the first switch on the bridge unit, the third controls signal high frequency
The switched conductive third switch on the bridge unit, the second control signal end the first bridge switch unit and the 4th control
When the signal conduction third bridge switch unit, first inductance and the third inductance are to release and can operate, DC communication conversion
Device provides a positive half cycle and releases a phase electricity that energy circuit is sequentially first inductance, the third inductance, the three-phase alternating current out-put supply
Pressure, the b phase voltage of the three-phase alternating current out-put supply, the third bridge switch unit and the third switch on the bridge unit institute structure
At.
7. DC communication conversion equipment as claimed in claim 4, which is characterized in that be when the three-phase alternating current exports alternate power supply
Negative half period operation, the second control signal are high frequency switched conductive the first bridge switch unit, the 4th control signal high frequency
Switching ends the third bridge switch unit, the first control signal ends the first switch on the bridge unit and third control
When the signal conduction third switch on the bridge unit, first inductance and the third inductance are stored energy operation, DC communication conversion
It is sequentially that the direct-current input power supplying, the first capacitor, the neutral point, the three-phase alternating current are defeated that device, which provides a negative half period tank circuit,
Out the b phase voltage of power supply, a phase voltage of the three-phase alternating current out-put supply, the third inductance, first inductance and this under first
Bridge switch unit is constituted.
8. DC communication conversion equipment as claimed in claim 4, which is characterized in that be when the three-phase alternating current exports alternate power supply
Negative half period operation, the second control signal are that high frequency switching ends the first bridge switch unit, the 4th control signal high frequency
The switched conductive third bridge switch unit, the first control signal end the first switch on the bridge unit and third control
When the signal conduction third switch on the bridge unit, first inductance and the third inductance are to release and can operate, DC communication conversion
It is sequentially the third inductance, first inductance, the third switch on the bridge unit, the third that device, which provides a negative half period and releases energy circuit,
The a phase voltage institute structure of bridge switch unit, the b phase voltage of the three-phase alternating current out-put supply and the three-phase alternating current out-put supply
At.
9. DC communication conversion equipment as described in claim 1, which is characterized in that the control circuit further include:
One balancing circuitry, comprising:
One third arithmetic element receives one first DC voltage and one second DC voltage, executes first DC voltage and subtract
The operation of second DC voltage, to generate a voltage difference；And
One proportional plus integral control unit, receives the voltage difference, executes the proportional integration operation of the voltage difference, to generate a voltage difference
Signal；
One the 4th arithmetic element receives the alternate signal of the ab and the voltage differential signal, executes the alternate signal of the ab and subtracts the voltage
Difference signal, to generate the alternate revise signal of an ab；And
One the 5th arithmetic element receives the alternate signal of the cb and the voltage differential signal, executes the alternate signal of the cb and subtracts the voltage
Difference signal, to generate the alternate revise signal of a cb；
Wherein the alternate revise signal of ab revise signal alternate with the cb is to input the control signal generating circuit, described in generating
Control signal.
10. a kind of operating method of DC communication conversion equipment, the DC communication conversion equipment is to convert a direct-current input power supplying
For a three-phase alternating current out-put supply, which is characterized in that the operating method includes the following steps:
(a) an input capacitance group is provided, connects the direct-current input power supplying, and there is a neutral point；Wherein neutral point connection should
One first phase sequence of three-phase alternating current out-put supply, to provide a first path；
(b) one first conversion circuit, including one first bridge arm and one second bridge arm are provided；Wherein first bridge arm has one first
Switch on the bridge unit and the one first bridge switch unit that the first switch on the bridge unit is connected in series, and it is connected to one first company
Contact；Second bridge arm has one second switch on the bridge unit and one second lower bridge of the second switch on the bridge unit is connected in series
Switch unit, and it is connected to one second tie point；Wherein first tie point connects the one second of the three-phase alternating current out-put supply
Phase sequence, to provide one second path, which connects a third phase sequence of the three-phase alternating current out-put supply, to provide one
Third path；
(c) one second conversion circuit, including a third bridge arm and a four bridge legs are provided；Wherein the third bridge arm has a third
Switch on the bridge unit and the third bridge switch unit that the third switch on the bridge unit is connected in series have one first to be formed
One first tandem paths at end and a second end, and the first end connects second path；The four bridge legs have on one the 4th
Bridge switch unit and one the 4th bridge switch unit that the 4th switch on the bridge unit is connected in series have a first end to be formed
With one second tandem paths of a second end, and the first end connects the third path；Wherein first tandem paths this
Two ends connect the second end of second tandem paths, and reconnect the first path；And
(d) control circuit is provided, multiple control signal is generated according to an alternate signal, control respectively first conversion circuit with
Second conversion circuit, with convert the direct-current input power supplying be the three-phase alternating current out-put supply,
Wherein, which subtracts each other generation by each phase signals；The alternate signal of one ab is that an a phase signals subtract b phase signals production
Raw, the alternate signal of a cb is that a c phase signals subtract b phase signals generation.
11. the operating method of DC communication conversion equipment as claimed in claim 10, which is characterized in that further include:
One output filter circuit is provided, comprising:
One first outputting inductance group including one first inductance being connected on second path and is connected on the third path
One second inductance；
One second outputting inductance group including the third inductance being connected on second path and is connected on the third path
One the 4th inductance；Wherein the third inductance is connected in series in first inductance, which is connected in series the 4th inductance；
One first output capacitance group including the first capacitor being connected on second path and is connected on the third path
One second capacitor；And
One second output capacitance group including the third capacitor being connected on second path and is connected on the third path
One the 4th capacitor.
12. the operating method of DC communication conversion equipment as claimed in claim 11, which is characterized in that the control circuit is at least
Including a control signal generating circuit, which includes:
The reversed unit of one signal；
One first anti-gate cell；
One second anti-gate cell；
One first comparing unit has an inverting input terminal, a non-inverting input and an output end；The non-inverting input
The alternate signal is received, which receives a triangle carrier signal；The output end exports a first control signal, and
The output end connects the first anti-gate cell to export third control signal；Wherein the triangle carrier signal is a high frequency carrier
Signal；And
One second comparing unit has an inverting input terminal, a non-inverting input and an output end；The non-inverting input
It connects the reversed unit of the signal and receives the alternate signal again, which receives the triangle carrier signal；The output end is defeated
A second control signal out, and the output end connects the second anti-gate cell to export one the 4th control signal.
13. the operating method of DC communication conversion equipment as claimed in claim 12, which is characterized in that when the exchange output phase
Between power supply when being positive half cycle, the first control signal third complementary with level control signal for high frequency switching signal, this
Two control signals are a low level signal and the 4th control signal is a high level signal；The exchange exports alternate power supply
When negative half period, the second control signal fourth control signal complementary with level is high frequency switching signal, the first control letter
Number controlling signal for a low level signal and the third is a high level signal.
14. the operating method of DC communication conversion equipment as claimed in claim 13, which is characterized in that when the three-phase alternating current is defeated
Alternate power supply is positive half cycle operation, the first control signal high frequency switched conductive the first switch on the bridge unit, the third control out
Signal high frequency processed switching ends the third switch on the bridge unit, the second control signal ends the first bridge switch unit and
When the 4th control signal conduction third bridge switch unit, first inductance and the third inductance are stored energy operation, this is straight
Stream AC conversion apparatus provides a positive half cycle tank circuit and is sequentially the direct-current input power supplying, the first switch on the bridge unit, is somebody's turn to do
First inductance, the third inductance, a phase voltage of the three-phase alternating current out-put supply, the b phase voltage of the three-phase alternating current out-put supply,
The neutral point and second capacitor are constituted.
15. the operating method of DC communication conversion equipment as claimed in claim 13, which is characterized in that when the three-phase alternating current is defeated
Alternate power supply is positive half cycle operation out, which is that high frequency switching ends the first switch on the bridge unit, the third
Control the signal high frequency switched conductive third switch on the bridge unit, the second control signal end the first bridge switch unit with
And when the 4th control signal conduction third bridge switch unit, first inductance and the third inductance are to release and can operate, should
DC communication conversion equipment provide a positive half cycle release can circuit be sequentially that first inductance, the third inductance, the three-phase alternating current are defeated
Bridge in a phase voltage of power supply, the b phase voltage of the three-phase alternating current out-put supply, the third bridge switch unit and the third out
Switch unit is constituted.
16. the operating method of DC communication conversion equipment as claimed in claim 13, which is characterized in that when the three-phase alternating current is defeated
Alternate power supply is negative half period operation out, which is high frequency switched conductive the first bridge switch unit, the 4th
Control signal high frequency switching end the third bridge switch unit, the first control signal end the first switch on the bridge unit with
And when third control signal conduction third switch on the bridge unit, first inductance and the third inductance are stored energy operation, should
DC communication conversion equipment provide a negative half period tank circuit be sequentially the direct-current input power supplying, the first capacitor, the neutral point,
The b phase voltage of the three-phase alternating current out-put supply, a phase voltage of the three-phase alternating current out-put supply, the third inductance, first inductance
And the first bridge switch unit is constituted.
17. the operating method of DC communication conversion equipment as claimed in claim 13, which is characterized in that when the three-phase alternating current is defeated
Alternate power supply is negative half period operation out, which is that high frequency switching ends the first bridge switch unit, the 4th
Control the signal high frequency switched conductive third bridge switch unit, the first control signal end the first switch on the bridge unit with
And when third control signal conduction third switch on the bridge unit, first inductance and the third inductance are to release and can operate, should
DC communication conversion equipment provide a negative half period release can circuit be sequentially the third inductance, first inductance, bridge is opened in the third
Close unit, the third bridge switch unit, the b phase voltage of the three-phase alternating current out-put supply and the three-phase alternating current out-put supply
A phase voltage is constituted.
18. the operating method of DC communication conversion equipment as claimed in claim 10, which is characterized in that the control circuit is also wrapped
It includes:
One balancing circuitry, comprising:
One third arithmetic element receives one first DC voltage and one second DC voltage, executes first DC voltage and subtract
The operation of second DC voltage, to generate a voltage difference；And
One proportional plus integral control unit, receives the voltage difference, executes the proportional integration operation of the voltage difference, to generate a voltage difference
Signal；
One the 4th arithmetic element receives the alternate signal of the ab and the voltage differential signal, executes the alternate signal of the ab and subtracts the voltage
Difference signal, to generate the alternate revise signal of an ab；And
One the 5th arithmetic element receives the alternate signal of the cb and the voltage differential signal, executes the alternate signal of the cb and subtracts the voltage
Difference signal, to generate the alternate revise signal of a cb；
Wherein the alternate revise signal of ab revise signal alternate with the cb is to input the control signal generating circuit, described in generating
Control signal.
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| CN201510044911.9A CN105991058B (en) | 2015-01-29 | 2015-01-29 | DC communication conversion equipment and its operating method |
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| CN201510044911.9A CN105991058B (en) | 2015-01-29 | 2015-01-29 | DC communication conversion equipment and its operating method |
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| CN102882398A (en) * | 2011-07-13 | 2013-01-16 | 台达电子工业股份有限公司 | Direct current-alternating current converter |
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|---|---|---|---|---|
| EP2107672A1 (en) * | 2008-03-31 | 2009-10-07 | SMA Solar Technology AG | Three-phase inverter without connection between the neutral conductor of the grid and the mid-point of the intermediate circuit |
| JP2010273438A (en) * | 2009-05-20 | 2010-12-02 | Daihen Corp | Grid connected inverter system |
| EP2546973A2 (en) * | 2011-07-13 | 2013-01-16 | Delta Electronics, Inc. | DC to AC converter |
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