CN109831111A - A kind of two-stage type three phase soft switch current transformer - Google Patents
A kind of two-stage type three phase soft switch current transformer Download PDFInfo
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- CN109831111A CN109831111A CN201910214706.0A CN201910214706A CN109831111A CN 109831111 A CN109831111 A CN 109831111A CN 201910214706 A CN201910214706 A CN 201910214706A CN 109831111 A CN109831111 A CN 109831111A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The present invention discloses a kind of two-stage type three phase soft switch current transformer, including prime DC-DC converter, rear class three-phase dc-AC converter, the resonant branch of auxiliary switch of the access comprising anti-paralleled diode, clamping capacitance and resonant inductance composition, main switch and auxiliary switch both ends parallel resonance capacitor between the positive common bus and intermediate dc lateral capacitance of front stage.The present invention synchronizes the drive pulse signal of auxiliary switch and the main switch in front and back stages current transformer, it can realize that the no-voltage of all switching tubes is open-minded in each switch periods, effectively inhibit the reverse recovery current of main switch anti-paralleled diode, switching loss is small, circuit efficiency is high, be conducive to improve switching frequency, lifting system power density.
Description
Technical field
The present invention relates to DC-AC conversion technical field more particularly to a kind of two-stage type three phase soft switch current transformer electricity
Road.
Background technique
Traditional two-stage type 3-phase power converter circuit, including four groups of half-bridge bridge arms；First half-bridge bridge arm and input side electricity
Sense composition DC-DC converter, second half-bridge bridge arm, third half-bridge bridge arm, the 4th half-bridge bridge arm and three exchanges
The direct-current-alternating-current converter of side inductance composition three-phase is connect with three phase network；The upper and lower end of four bridge arms composes in parallel respectively
Positive and negative bus is directly connected with dc-link capacitance, and first half-bridge bridge arm is by the voltage transformation in input direct-current source at direct current mother
Line voltage, the DC bus-bar voltage is as rear class three-phase dc-AC converter input voltage；Traditional three phase transformation of two-stage type
The work of device circuit is flowed in hard switching state, and there are diode reverse recovery phenomenon, change of current device switching loss is big, limits work
The raising of frequency leads to that circuit efficiency need to be reduced using biggish filter.
Summary of the invention
The object of the present invention is to provide a kind of reduction switching losses, improve the two-stage type three phase soft switch unsteady flow of circuit efficiency
Device circuit topology and its modulator approach.
The one aspect of the content of present invention, provides a kind of two-stage type three phase soft switch converter circuit topology, and feature exists
In: the two-stage type three phase soft switch converter circuit includes exchange side filter inductance La、Lb、Lc；Direct current input side inductance L1；
Four groups of half-bridge bridge arms；DC bus capacitor Cdc；And one group includes a parallel diode D7Auxiliary switch S7, resonant inductance
Lr, clamping capacitance CcThe auxiliary resonance branch of composition, wherein auxiliary switch S7With clamping capacitance CcAfter series connection again and resonant inductance
LrIt is in parallel；Above-mentioned every group of half-bridge bridge arm is made of two concatenated full-control type main switches comprising anti-simultaneously diode, the first bridge
The upper and lower main switch of arm and its anti-and diode are respectively S8、S9And D8、D9, the upper and lower main switch of the second bridge arm and its
Anti- and diode is respectively S1、S4And D1、D4, the upper and lower main switch of third bridge arm and its anti-and diode are respectively S3、S6With
D3、D6, the upper and lower main switch of four bridge legs and its anti-and diode are respectively S5、S2And D5、D2, upper and lower the two of four groups of bridge arms
End is in parallel to form positive and negative common bus；Above-mentioned positive common bus and DC bus capacitor CdcBetween access above-mentioned auxiliary resonance branch；
The midpoint of first bridge arm connects inductance L1One end, L1The other end be connected with the anode in input direct-current source, the negative terminal of DC source with
Negative common bus is connected；Second bridge arm, third bridge arm, four bridge legs midpoint be separately connected La、Lb、Lc, La、Lb、LcIt is another
End is connected with three phase network respectively；Each switching tube S1~S6、S8~S9And S7One in parallel respectively, collector and emitter both ends
Resonant capacitance C1~C6、C8~C9And C7。
The other side of the content of present invention provides a kind of modulator approach of two-stage type three phase soft switch current transformer, special
Sign is: the upper and lower main switch of first bridge arm uses the pulsewidth modulation of fixed duty cycle, second bridge arm, third
Bridge arm, four bridge legs main switch use Sine Wave Pulse Width Modulation or space vector modulating method, all main switches and
Auxiliary switch switching frequency having the same；In each switch periods, to present in aforementioned four bridge arm by diode
It synchronizes to the switch motion moment of the main switch change of current, and is moved above-mentioned from diode to the switch of the main switch change of current
Auxiliary switch S is turned off before making the moment7, positive and negative common bus voltage resonance is zero, creates what no-voltage was opened for main switch
Condition；After all diodes terminate to supervisor's commutation course, resonant capacitance C7On voltage by resonance be zero, auxiliary switch
Pipe S7It is open-minded to carry out no-voltage.
Compared with prior art, the present invention have it is following the utility model has the advantages that
Using two-stage type three phase soft switch converter circuit of the invention, prime DC-DC converter is able to achieve with after
All main switches of grade direct-current-alternating-current converter and auxiliary switch gamut zero voltage switch in power frequency period, the change
The Reverse recovery of clamp diode is inhibited in parallel operation, reduces electromagnetic interference.All device for power switching are realized in circuit
Sofe Switch, switching loss is small, and circuit efficiency is high, is conducive to improve working frequency, and then improve power density.
Detailed description of the invention
Fig. 1 is two-stage type three phase soft switch converter circuit topological diagram.
Fig. 2 is the six operation interval schematic diagrames divided in a power frequency period according to output current wave.
Fig. 3 is pulse control timing diagram of the present invention in section 1.
Fig. 4~17 are respectively the work equivalent circuit in each stage of a switch periods of the invention in section 1.
Figure 18 is the groundwork voltage and current waveform of present invention switch periods in section 1.
Specific embodiment
The present invention is described in detail combined with specific embodiments below.Following embodiment will be helpful to the technology of this field
Personnel further understand the present invention, but the invention is not limited in any way.It should be pointed out that the ordinary skill of this field
For personnel, without departing from the inventive concept of the premise, various modifications and improvements can be made.These belong to the present invention
Protection scope.The present invention is described in detail with reference to the accompanying drawing.
Referring to Fig.1, the two-stage type three phase soft switch converter circuit includes exchange side filter inductance La、Lb、Lc；Direct current
Input side inductance L1；Four groups of half-bridge bridge arms；DC bus capacitor Cdc；And one group includes a parallel diode D7Auxiliary switch
Pipe S7, resonant inductance Lr, clamping capacitance CcThe auxiliary resonance branch of composition, wherein auxiliary switch S7With clamping capacitance CcAfter series connection
Again with resonant inductance LrIt is in parallel；Above-mentioned every group of half-bridge bridge arm is by two concatenated full-control type main switches comprising anti-simultaneously diode
It constitutes, the upper and lower main switch of the first bridge arm and its anti-and diode are respectively S8、S9And D8、D9, the upper and lower master of the second bridge arm
Switching tube and its anti-and diode are respectively S1、S4And D1、D4, the upper and lower main switch of third bridge arm and its anti-and diode divide
It Wei not S3、S6And D3、D6, the upper and lower main switch of four bridge legs and its anti-and diode are respectively S5、S2And D5、D2, four groups of bridges
The upper/lower terminal parallel connection of arm forms positive and negative common bus；Above-mentioned positive common bus and DC bus capacitor CdcBetween access it is above-mentioned auxiliary
Help resonant branch；The midpoint of first bridge arm connects inductance L1One end, L1The other end be connected with the anode in input direct-current source, directly
The negative terminal in stream source is connected with negative common bus；Second bridge arm, third bridge arm, four bridge legs midpoint be separately connected La、Lb、Lc,
La、Lb、LcThe other end be connected respectively with three phase network；Each switching tube S1~S6、S8~S9And S7Collector and emitter both ends
One resonant capacitance C of parallel connection respectively1~C6、C8~C9And C7。
For two-stage type three phase soft switch converter circuit, electric current i can be exported according to three-phasea、ib、icPhase condition,
Working region is divided into six regions, as shown in Fig. 2, input current i simultaneously1Polarity, there is also be greater than zero and less than zero
Two kinds of situations.Below with three-phase current ia、ib、icIt is in region 1, and input current i1For zero, exist to circuit work
The course of work in one switch periods is analyzed.
Due in region 1, i1、iaGreater than zero, ib、icLess than zero, in a switch periods, there are four diodes
To the process of the main switch change of current, respectively D8To S9The change of current, D4To S1The change of current, D3To S6The change of current, D5To S2The change of current, in the switch
In period, the pulse control timing of switching tube is as shown in figure 3, current transformer shares 14 working conditions.Fig. 4~17 are in the region
The work equivalent circuit of one switch periods, the mains voltage and current waveform when work are as shown in figure 18, the voltage electricity of circuit
It is as shown in Figure 1 to flow reference direction.The course of work of the circuit work in other sections is similar.
Specific phase analysis is as follows:
One (t of stage0~t1):
As shown in figure 4, the first bridge arm upper tube diode D8, the second bridge arm down tube diode D4, third bridge arm upper tube diode
D3, four bridge legs upper tube diode D5It is both turned on, by resonant inductance Lr, clamping capacitance Cc, auxiliary switch S7The auxiliary circuit of composition
In, clamping capacitance CcBoth end voltage is UCc, resonant inductance electric current linear rise；
Two (t of stage1~t2):
As shown in figure 5, in t1Moment auxiliary switch S7Shutdown, resonant inductance LrMake main switch S9、S1、S6、S2Parallel connection
Capacitor C9、C1、C6、C2Electric discharge, while making auxiliary switch S7Shunt capacitance C7Charging, resonant inductance LrElectric current iLrUnder resonance
Drop, in t2Moment, main switch S9、S1、S6、S2Shunt capacitance C9、C1、C6、C2To zero, which terminates voltage resonance；
Three (t of stage2~t3):
As shown in fig. 6, in t2D after moment9、D1、D6、D2It can be connected, by C9、C1、C6、C2On voltage clamp be zero, can
In t2Moment opens S9、S1、S6、S2, it can be achieved that S9、S1、S6、S2No-voltage it is open-minded, in t3Moment, D9、D1、D6、D2Electric current decline
To zero, which terminates.
Four (t of stage3~t4):
As shown in fig. 7, in D9、D1、D6、D2After shutdown, circuit enters change of current stage, electric current i1By diode D8To switching tube
S9The change of current, electric current iaBy diode D4To switching tube S1The change of current, electric current ibBy diode D3To switching tube S6The change of current, electric current icBy two
Pole pipe D5To switching tube S2The change of current.The voltage at the both ends resonant inductance Lr is clamped at V at this stagedc, resonant inductance electric current iLrLine
Property decline, in t4Moment, above four bridge arm changes of current terminate, which terminates.Wherein VdcFor the electricity on dc-link capacitance
Pressure.
Five (t of stage4~t5):
As shown in figure 8, in t4I after momentLrContinue to decline, C7Start to discharge, C8、C4、C3、C5Start to charge, circuit into
Enter second of resonance, in t5Moment C7On voltage resonance to zero, which terminates.
Six (t of stage5~t6):
As shown in figure 9, t5After moment, D7It can be connected, by C7On voltage clamp be zero, be auxiliary tube S7No-voltage
Offer condition is provided, it can be in t5Moment is to S7Open signal is sent, it is open-minded to achieve no-voltage, works as S9In t6When moment turns off,
The stage terminates.
Seven (t of stage6~t7):
As shown in Figure 10, S9In t6After moment shutdown, the main switch up and down of the first bridge arm starts the change of current, C9It starts to charge,
C8Start to discharge, in t7Moment, C9On voltage rise to UCc+Vdc, C8On voltage drop to zero, which terminates.
Eight (t of stage7~t8):
As shown in figure 11, the change of current, D are completed in the first bridge arm8After afterflow conducting, S8It is open-minded, in this stage S8、S1、S6、S2It protects
Hold opening state, resonant inductance electric current linear rise, in t8Moment S6Shutdown, the stage terminate.
Nine (t of stage8~t9):
As shown in figure 12, S6In t8After moment shutdown, third bridge arm starts the change of current, C6It starts to charge, C3Start to discharge, in t9
Moment, C6On voltage rise to UCc+Vdc, C3On voltage drop to zero, which terminates.
Ten (t of stage9~t10):
As shown in figure 13, the change of current, D are completed in third bridge arm3After afterflow conducting, S3It is open-minded, in this stage S8、S1、S3、S2It protects
Hold opening state, resonant inductance electric current linear rise, in t10Moment S2Shutdown, the stage terminate.
11 (t of stage10~t11):
As shown in figure 14, S2In t10After moment shutdown, four bridge legs start the change of current, C2It starts to charge, C5Start to discharge,
t11Moment, C2On voltage rise to UCc+Vdc, C5On voltage drop to zero, which terminates.
12 (t of stage11~t12):
As shown in figure 15, the change of current, D are completed in four bridge legs5After afterflow conducting, S5It is open-minded, in this stage S8、S1、S3、S5It protects
Hold opening state, resonant inductance electric current linear rise, in t12Moment S1Shutdown, the stage terminate.
13 (t of stage12~t13):
As shown in figure 16, S1In t12After moment shutdown, the second bridge arm starts the change of current, C1It starts to charge, C4Start to discharge,
t13Moment, C1On voltage rise to UCc+Vdc, C4On voltage drop to zero, which terminates.
14 (t of stage13~t14):
The change of current, D are completed in the second bridge arm4After afterflow conducting, S4It is open-minded, in this stage S8、S4、S3、S5Opening state is kept,
Resonant inductance electric current linear decline, the stage are identical as the stage one.
Claims (2)
1. a kind of two-stage type three phase soft switch current transformer, it is characterised in that: the two-stage type three phase soft switch converter circuit packet
Include exchange side filter inductance La、Lb、Lc；Direct current input side inductance L1；Four groups of half-bridge bridge arms；DC bus capacitor Cdc；And one group of packet
Containing a parallel diode D7Auxiliary switch S7, resonant inductance Lr, clamping capacitance CcThe auxiliary resonance branch of composition, wherein
Auxiliary switch S7With clamping capacitance CcAfter series connection again with resonant inductance LrIt is in parallel；Above-mentioned every group of half-bridge bridge arm is concatenated by two
It is constituted comprising anti-and diode full-control type main switch, the upper and lower main switch of the first bridge arm and its anti-and diode difference
For S8、S9And D8、D9, the upper and lower main switch of the second bridge arm and its anti-and diode are respectively S1、S4And D1、D4, third bridge arm
Upper and lower main switch and its anti-and diode be respectively S3、S6And D3、D6, the upper and lower main switch of four bridge legs and its anti-
And diode is respectively S5、S2And D5、D2, the upper/lower terminal parallel connection of four groups of bridge arms forms positive and negative common bus；It is above-mentioned just public
Bus and DC bus capacitor CdcBetween access above-mentioned auxiliary resonance branch；The midpoint of first bridge arm connects inductance L1One end, L1
The other end be connected with the anode in input direct-current source, the negative terminal of DC source is connected with negative common bus；Second bridge arm, third bridge
Arm, four bridge legs midpoint be separately connected La、Lb、Lc, La、Lb、LcThe other end be connected respectively with three phase network；Each switching tube S1
~S6、S8~S9And S7Collector and emitter both ends a resonant capacitance C in parallel respectively1~C6、C8~C9And C7。
2. a kind of modulator approach of two-stage type three phase soft switch current transformer, it is characterised in that: the upper and lower master of first bridge arm opens
Close pipe S8、S9Controlled using pulse duration modulation method, second bridge arm, third bridge arm, four bridge legs six main switches
S1~S6It is controlled using no-voltage Sine Wave Pulse Width Modulation or the sine wave pulse width modulation method for injecting triple-frequency harmonics, institute
There are main switch and auxiliary switch S7Switching frequency having the same；In each switch periods, in aforementioned four bridge arm
It is existing to be synchronized from diode to the switch motion moment of the main switch change of current, and above-mentioned from diode to main switch
Auxiliary switch S was turned off before the switch motion moment of the pipe change of current7, the voltage resonance between positive and negative common bus is zero, based on open
It closes pipe and creates the condition that no-voltage is opened；After all diodes terminate to supervisor's commutation course, resonant capacitance C7On electricity
Resonance is zero by pressure, auxiliary switch S7It is open-minded to carry out no-voltage.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910214706.0A CN109831111A (en) | 2019-03-20 | 2019-03-20 | A kind of two-stage type three phase soft switch current transformer |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910214706.0A CN109831111A (en) | 2019-03-20 | 2019-03-20 | A kind of two-stage type three phase soft switch current transformer |
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| CN109831111A true CN109831111A (en) | 2019-05-31 |
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| CN201910214706.0A Pending CN109831111A (en) | 2019-03-20 | 2019-03-20 | A kind of two-stage type three phase soft switch current transformer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110277934A (en) * | 2019-07-16 | 2019-09-24 | 东北大学 | A kind of simply double auxiliary resonance polar form inverter circuits of structure and its modulator approach |
| WO2022156258A1 (en) * | 2021-01-19 | 2022-07-28 | 株洲中车时代电气股份有限公司 | Converter and traction drive system |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205754197U (en) * | 2016-06-29 | 2016-11-30 | 国网山东省电力公司阳谷县供电公司 | Photovoltaic generating system with low energy consumption auxiliary circuit |
| CN108352786A (en) * | 2015-09-28 | 2018-07-31 | 哈佛大学校长及研究员 | Driver for high-voltage capacitance formula actuator |
-
2019
- 2019-03-20 CN CN201910214706.0A patent/CN109831111A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108352786A (en) * | 2015-09-28 | 2018-07-31 | 哈佛大学校长及研究员 | Driver for high-voltage capacitance formula actuator |
| CN205754197U (en) * | 2016-06-29 | 2016-11-30 | 国网山东省电力公司阳谷县供电公司 | Photovoltaic generating system with low energy consumption auxiliary circuit |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110277934A (en) * | 2019-07-16 | 2019-09-24 | 东北大学 | A kind of simply double auxiliary resonance polar form inverter circuits of structure and its modulator approach |
| CN110277934B (en) * | 2019-07-16 | 2021-02-26 | 东北大学 | Double-auxiliary resonant-pole inverter circuit with simple structure and modulation method thereof |
| WO2022156258A1 (en) * | 2021-01-19 | 2022-07-28 | 株洲中车时代电气股份有限公司 | Converter and traction drive system |
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Application publication date: 20190531 |