CN109905043A - A kind of modulator approach of the three-phase four-wire system Sofe Switch rectifier with uniform voltage function - Google Patents
A kind of modulator approach of the three-phase four-wire system Sofe Switch rectifier with uniform voltage function Download PDFInfo
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- CN109905043A CN109905043A CN201910263762.3A CN201910263762A CN109905043A CN 109905043 A CN109905043 A CN 109905043A CN 201910263762 A CN201910263762 A CN 201910263762A CN 109905043 A CN109905043 A CN 109905043A
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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
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- 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 modulator approach of three-phase four-wire system Sofe Switch rectifier with uniform voltage function, and this method is to fix the switching frequency of all main switches and auxiliary switch and identical；In each switch periods, it will occur to turn off auxiliary switch S before the synchronization point from diode to synchronizing at the time of its complementary switch pipe change of current in four groups of bridge armsaux, the busbar voltage resonance by four groups of bridge arm both ends is zero；After all diodes terminate to supervisor's commutation course, bridge arm direct pass process is increased according to the polarity of balance inductance electric current, when balance inductance electric current flows out the 4th group of bridge arm midpoint, does not increase bridge arm direct pass process；When balance inductance electric current flows into the 4th group of bridge arm midpoint, increase bridge arm direct pass process, resonant capacitance CrauxOn voltage resonance be zero after, auxiliary switch SauxIt is open-minded to carry out no-voltage.The reverse recovery current of main switch anti-paralleled diode can be effectively suppressed in the present invention, and switching loss is small, is conducive to improve efficiency and power density.
Description
Technical field
The present invention relates to rectifier technical field more particularly to a kind of three-phase four-wire system Sofe Switch rectifications with uniform voltage function
The modulator approach of device.
Background technique
Traditional three-phase four-wire system rectifier with uniform voltage function, including four groups of half-bridge bridge arms, every group of bridge arm are gone here and there by two
Connection is constituted comprising anti-and diode full-control type main switch.First group of half-bridge bridge arm, second group of half-bridge bridge arm, third group half
Three, bridge bridge arm midpoint exchange side filter inductance is connect with three phase network, in three phase network midpoint and DC side series capacitance group
Point is connected directly, and constitutes three-phase four-wire system A.C.-D.C. converter；4th group of half-bridge bridge arm midpoint is through balance inductance and DC side
The connection of series capacitance class mid point, constitutes equalizer circuit.The upper and lower end of four groups of bridge arms composes in parallel positive and negative bus, DC side respectively
Series capacitance group is connected across between positive and negative bus.First group of traditional three-phase four-wire system rectifier circuit with uniform voltage function
Half-bridge bridge arm, second group of half-bridge bridge arm, third group half-bridge bridge arm are controlled using Sine Wave Pulse Width Modulation mode, and four and Ban
Bridge bridge arm is controlled using pulse width modulation mode, and circuit work switching device and diode in hard switching state, circuit exist
Very big switching loss and diode reverse recovery losses are generated in work respectively, the raising of working frequency is limited, leads to electricity
Filter size is larger in road, and power density is not high.
Summary of the invention
The object of the present invention is to provide a kind of reduction switching loss, the band for improving circuit working efficiency and power density is pressed
The modulator approach of the three-phase four-wire system Sofe Switch rectifier of function.
The technical solution adopted by the invention is as follows:
The present invention provides a kind of modulator approach of three-phase four-wire system Sofe Switch rectifier with uniform voltage function, and this method is:
The switching frequency of all main switches and auxiliary switch is fixed and identical；In each switch periods, it will be sent out in four groups of bridge arms
It is raw from diode to being synchronized at the time of its complementary switch pipe change of current, and turn off auxiliary switch before the synchronization point
Saux, the busbar voltage resonance by four groups of bridge arm both ends is zero, opens and creates conditions for the no-voltage of main switch on bridge arm；?
After all diodes terminate to supervisor's commutation course, bridge arm direct pass process is increased according to the polarity of balance inductance electric current, when flat
When the inductive current that weighs flows out the 4th group of bridge arm midpoint, bridge arm direct pass process is not increased；When balance inductance electric current flows into the 4th group of bridge
When arm midpoint, increases bridge arm direct pass process, magnetize to resonant inductance, after the above process, resonant capacitance CrauxOn
Resonance, C will occur for voltagerauxOn voltage resonance be zero after, auxiliary switch SauxIt 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 modulator approach of the invention, in power frequency period, the three-phase four-wire system Sofe Switch rectifier with uniform voltage function
All main switches and auxiliary switch are able to achieve gamut zero voltage switch in power frequency period, two poles in converter in circuit
The Reverse recovery of pipe is inhibited, and electromagnetic interference is reduced.The switching loss of power device and diode reverse recovery damage in circuit
Depletion is small, is conducive to improve efficiency and power density.
Detailed description of the invention
Fig. 1 is the three-phase four-wire system Sofe Switch rectifier topology figure with uniform voltage function.
Fig. 2 is the six operation interval schematic diagrames divided in a power frequency period according to input current waveform.
Fig. 3 is driving pulse control sequential figure of the present invention in the I of section.
Fig. 4~18 are respectively the work equivalent circuit in each stage of a switch periods of the invention in the I of section.
Figure 19 is the groundwork voltage and current waveform of present invention switch periods in the I of section.
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 three-phase four-wire system Sofe Switch rectifier circuit with uniform voltage function includes exchange side filter inductance La、Lb、
Lc；Balance inductance Lbal；Four groups of half-bridge bridge arms；DC side series capacitance group Co1And Co2；DC side series load RL1And RL2；And
One group includes a parallel diode DauxAuxiliary switch Saux, resonant inductance Lr, clamping capacitance CcThe auxiliary resonance branch of composition
Road, wherein resonant inductance LrWith clamping capacitance CcAfter series connection again with auxiliary switch SauxIt is in parallel；Above-mentioned four groups of half-bridge bridge arms it is every
Group bridge arm is made of two concatenated full-control type main switches comprising anti-simultaneously diode, the upper and lower main switch of first group of bridge arm
Pipe and its anti-and diode are respectively S1、S4And D1、D4, the upper and lower main switch and its anti-and diode difference of second group of bridge arm
For S3、S6And D3、D6, the upper and lower main switch of third group bridge arm and its anti-and diode are respectively S5、S2And D5、D2, the 4th group
The upper and lower main switch of bridge arm and its anti-and diode are respectively S7、S8And D7、D8, first group of bridge arm, second group of bridge arm, third
The midpoint of group bridge arm is separately connected filter inductance La、Lb、LcOne end, La、Lb、LcThe other end be connected respectively with three phase network,
Three phase network midpoint is directly connected to series capacitance group Co1And Co2Midpoint, the midpoint of the 4th group of bridge arm connects balance inductance Lbal
One end, LbalThe other end and DC side series capacitance group Co1And Co2, DC side series load RL1And RL2Midpoint be connected.Four
The upper/lower terminal of group bridge arm is in parallel respectively to form positive and negative common bus, and above-mentioned auxiliary resonance branch connects in common bus and direct current
Between lateral capacitance group.Each switching tube S in circuit1~S8And SauxCollector and emitter both ends a resonant capacitance in parallel respectively
Cr1~Cr8And Craux。
It, can be according to three-phase input current i for the three-phase four-wire system Sofe Switch rectifier with uniform voltage functiona、ib、ic's
Working region is divided into six regions by polarity, as shown in Fig. 2, balance inductance electric current i simultaneouslybalPolarity, there is also be greater than zero
With less than 0 two kinds situations.Below with three-phase current ia、ib、icIt is in region I, and balance inductance electric current ibalIt is less than zero
Example analyzes the course of work of the circuit work in a switch periods.
Due in the I of region, iaGreater than zero, ib、icAnd ibalLess than zero, in a switch periods, there are four two poles
Pipe is to the process of the main switch change of current, respectively D1To S4The change of current, D6To S3The change of current, D2To S5The change of current, D7To S8The change of current.In order to incite somebody to action
This four change of current moment are aligned, and need that different types of sawtooth wave is selected to make according to each bridge arm midpoint sense of current respectively
For carrier wave.As shown in figure 3, when bridge arm midpoint electric current is to flow into bridge arm midpoint, such as iaAnd ibal, down type sawtooth wave is selected to make
For carrier wave, when bridge arm midpoint electric current is outflow bridge arm midpoint, such as ibAnd ic, select ascending-type sawtooth wave as carrier wave, thus will
Main switch S4、S3、S5And S8Open signal snap to switch periods initial time.At this point, being opened in a switch periods
The driving pulse control sequential of pipe is closed as shown in figure 3, current transformer shares 15 working conditions.Fig. 4~18 are one in the region
The work equivalent circuit of switch periods, the mains voltage and current waveform when work are as shown in figure 19, the voltage and current ginseng of circuit
It is as shown in Figure 1 to examine 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 D1, the second bridge arm down tube diode D6, third bridge arm down tube diode
D2, four bridge legs upper tube diode D7It is both turned on, by resonant inductance Lr, clamping capacitance Cc, auxiliary switch SauxThe auxiliary electricity of composition
Lu Zhong, clamping capacitance CcBoth end voltage is UCc, auxiliary switch SauxConducting, resonant inductance electric current linear rise；
Two (t of stage1~t2):
As shown in figure 5, in t1Moment auxiliary switch SauxShutdown, resonant inductance LrMake main switch S4、S3、S5、S8Parallel connection
Capacitor Cr4、Cr3、Cr5、Cr8Electric discharge, while making auxiliary switch SauxShunt capacitance CrauxCharging, in t2Moment, main switch S4、S3、
S5、S8Shunt capacitance Cr4、Cr3、Cr5、Cr8Voltage resonance to zero, which terminates；
Three (t of stage2~t3):
As shown in fig. 6, in t2D after moment4、D3、D5、D8It can be connected, by Cr4、Cr3、Cr5、Cr8On voltage clamp be
Zero, it can be in t2Moment opens S4、S3、S5、S8, it can be achieved that S4、S3、S5、S8No-voltage it is open-minded, in t3Moment, D4、D3、D5、D8Electricity
It flows down and drops to zero, which terminates.
Four (t of stage3~t4):
As shown in fig. 7, in D4、D3、D5、D8After shutdown, circuit enters change of current stage, electric current iaBy diode D1To switching tube
S4The change of current, electric current ibBy diode D6To switching tube S3The change of current, electric current icBy diode D2To switching tube S5The change of current, electric current ibalBy
Diode D7To switching tube S8The change of current.Resonant inductance L at this stagerThe voltage at both ends is clamped at Udc-UCc, wherein UdcFor rectification
Device exports the voltage on DC side bus capacitor, Udc=Udcp+Udcn, resonant inductance electric current iLrLinear decline, in t4It is moment, above
Four groups of bridge arm changes of current terminate, which terminates.
Five (t of stage4~t5):
As shown in figure 8, in t4Moment opens switching tube S1、S6、S2、S7, increase bridge arm direct pass process, resonant inductance carried out
It magnetizes to meet the condition that main switch no-voltage is opened.Switching tube S1、S6、S2、S7After opening, by resonant inductance LrBoth end voltage
Clamp is in Udc-UCc, resonant inductance electric current iLrContinue linear decline.
Six (t of stage5~t6):
As shown in figure 9, in t5Moment on-off switching tube S1、S6、S2、S7Afterwards, iLrContinue to decline, CrauxStart to discharge, Cr1、
Cr6、Cr2、Cr7It starts to charge, circuit enters second of resonance, in t6Moment CrauxOn voltage resonance to zero, which terminates.
Seven (t of stage6~t7):
As shown in Figure 10, t6After moment, DauxIt can be connected, by CrauxOn voltage clamp be zero, be auxiliary tube SauxZero
Voltage opens offer condition, can be in t6Moment is to SauxOpen signal is sent, S is madeauxIt realizes that no-voltage is open-minded, works as S4In t7Moment
When shutdown, which terminates.
Eight (t of stage7~t8):
As shown in figure 11, S4In t7After moment shutdown, the main switch up and down of the first bridge arm starts the change of current, Cr4Start to fill
Electricity, Cr1Start to discharge, in t8Moment, Cr4On voltage rise to Udc, Cr1On voltage drop to zero, which terminates.
Nine (t of stage8~t9):
As shown in figure 12, the change of current, D are completed in the first bridge arm1After afterflow conducting, S1It is open-minded, in this stage S1、S3、S5、S8It protects
Opening state is held, in t9Moment S2Shutdown, the stage terminate.
Ten (t of stage9~t10):
As shown in figure 13, S2In t9After moment shutdown, third bridge arm starts the change of current, Cr2It starts to charge, Cr5Start to discharge,
t10Moment, Cr2On voltage rise to Udc, Cr5On voltage drop to zero, which terminates.
11 (t of stage10~t11):
As shown in figure 14, in t10Moment, after third bridge arm completes the change of current, D2After afterflow conducting, S2It is open-minded, in this stage S1、
S3、S2、S8Opening state is kept, in t11Moment S3Shutdown, the stage terminate.
12 (t of stage11~t12):
As shown in figure 15, S3In t11After moment shutdown, the second bridge arm starts the change of current, Cr3It starts to charge, Cr6Start to discharge,
In t12Moment, Cr3On voltage rise to Udc, Cr6On voltage drop to zero, which terminates.
13 (t of stage12~t13):
As shown in figure 16, in t12Moment, the second bridge arm complete the change of current, D6After afterflow conducting, S6It is open-minded, in this stage S1、
S6、S2、S8Opening state is kept, in t13Moment S8Shutdown, the stage terminate.
14 (t of stage13~t14):
As shown in figure 17, S8In t13After moment shutdown, four bridge legs start the change of current, Cr8It starts to charge, Cr7Start to discharge,
In t14Moment, Cr8On voltage rise to Udc, Cr7On voltage drop to zero, which terminates.
15 (t of stage14~t0'):
As shown in figure 18, in t14Moment, after four bridge legs complete the change of current, D7Conducting, S7It is open-minded, in this stage S1、S6、S2、
S7Opening state is kept, the stage is identical as the stage one.
Claims (1)
1. a kind of modulator approach of the three-phase four-wire system Sofe Switch rectifier with uniform voltage function, it is characterised in that: all main switches
The switching frequency of pipe and auxiliary switch is fixed and identical；In each switch periods, it will occur in four groups of bridge arms by diode
To synchronizing at the time of its complementary switch pipe change of current, and auxiliary switch S is turned off before the synchronization pointaux, by four groups of bridges
The busbar voltage resonance at arm both ends is zero, opens and creates conditions for the no-voltage of main switch on bridge arm；All diodes to
After supervisor's commutation course terminates, bridge arm direct pass process is increased according to the polarity of balance inductance electric current, when balance inductance electric current stream
Out when the 4th group of bridge arm midpoint, bridge arm direct pass process is not increased；When balance inductance electric current flows into the 4th group of bridge arm midpoint, increase
Bridge arm direct pass process, magnetizes to resonant inductance, after the above process, resonant capacitance CrauxOn voltage will occur it is humorous
Vibration, CrauxOn voltage resonance be zero after, auxiliary switch SauxIt is open-minded to carry out no-voltage.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111865067A (en) * | 2020-07-17 | 2020-10-30 | 浙江大学 | Control method for power factor correction circuit |
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| US20080298103A1 (en) * | 2007-06-01 | 2008-12-04 | Drs Power & Control Technologies, Inc. | Four pole neutral-point clamped three phase converter with low common mode voltage output |
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| CN111865067A (en) * | 2020-07-17 | 2020-10-30 | 浙江大学 | Control method for power factor correction circuit |
| CN111865067B (en) * | 2020-07-17 | 2021-06-11 | 浙江大学 | Control method for power factor correction circuit |
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