CN107425729A - It is a kind of based on soft-switching process of the current-modulation than DAB that current efficiency optimizes - Google Patents
It is a kind of based on soft-switching process of the current-modulation than DAB that current efficiency optimizes Download PDFInfo
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- CN107425729A CN107425729A CN201710657519.0A CN201710657519A CN107425729A CN 107425729 A CN107425729 A CN 107425729A CN 201710657519 A CN201710657519 A CN 201710657519A CN 107425729 A CN107425729 A CN 107425729A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33561—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having more than one ouput with independent control
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/3353—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having at least two simultaneously operating switches on the input side, e.g. "double forward" or "double (switched) flyback" converter
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0048—Circuits or arrangements for reducing losses
- H02M1/0054—Transistor switching losses
- H02M1/0058—Transistor switching losses by employing soft switching techniques, i.e. commutation of transistors when applied voltage is zero or when current flow is zero
-
- 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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
It is a kind of based on soft-switching process of the current-modulation than DAB that current efficiency optimizes, phase shift optimizes modulator approach than phase shift between, former secondary than phase shift inside, secondary full-bridge than the current efficiency of three controlled quentity controlled variables inside primary side full-bridge based on DAB converters, it is proposed DAB soft-switching process, so that DAB is under different operating modes, device for power switching realizes Sofe Switch, the loss of device for power switching is reduced, further increases DAB efficiency.The present invention had both realized DAB current distortions minimum so that DAB power devices are operated in Sofe Switch, reduce the loss that DAB power devices are opened, turned off.The condition of DAB Sofe Switch is this method give, calculating process is simple, it is easy to accomplish.
Description
Technical field
The present invention relates to DC/DC current transformers, particularly a kind of double active full-bridge current transformers based on current efficiency optimization
(Dual Active Bridge-Isolated Bidirectional DC/DC Converter's, hereinafter referred to as DAB) is soft
Method of switching.Therefore the present invention's is entitled a kind of based on soft-switching process of the current-modulation than DAB that current efficiency optimizes.
Background technology
With the development of Power Electronic Technique, high-frequency isolation Technology of Power Conversion more and more will be applied in power network,
As the important means for realizing that fast and flexible controls in power network.Based on phase shifting control (Phase shift modulation
Scheme, PSMS) technology double active full-bridge current transformer (Dual Active Bridge-Isolated Bidirectional
DC/DC Converter, referred to as DAB) there is power density height, dynamic response to realize that Sofe Switch, power can be two-way soon, easily
It is the advantages that flowing, very popular in occasions such as uninterrupted power source, electric automobile, solid-state transformers.Common DAB current transformers control
Mode is phase shifting control, produces the voltage square wave with relative phase shift in the primary side port of high frequency transformer and secondary port, together
When by the relative phase shift that controls two full-bridge circuit diagonally opposing corner switching devices of primary and secondary side to drive, change accounting for for voltage square wave
Empty ratio, so as to adjust the power for flowing through current transformer.According to the selection of control variable, the modulation system of common DAB current transformers has：
Single phase shift modulation (Single phase shift modulation, SPSM), dual phase shift modulation (Dual phase shift
Modulation, DPSM), extension phase shift modulation (Extended phase shift modulation, EPSM) and triple phase shifts
Modulate (Triple phase shift modulation, TPSM) etc..Wherein TPSM has three independent controlled quentity controlled variables, is most
In general modulation system, SPSM, DPSM and EPSM can be considered as TPSM reduced form.Thus TPSM most flexibilities,
Can be by reasonably constraining the relation between controlled quentity controlled variable so that for DAB current transformers when transmitting identical power, reduction flows through change
The virtual value of depressor electric current, the current stress of device is reduced, so as to improve system effectiveness.
For DAB, its electric current operation distortion minimum is not required nothing more than, and require that its power device is operated in soft open
Close, so, it is opened, turn-off power loss can just reach minimum, and operational efficiency reaches highest.
The content of the invention
In view of the above-mentioned problems, it is an object of the invention to provide it is a kind of based on current-modulation than DAB's that current efficiency optimizes
Soft-switching process.The Sofe Switch condition of DAB in the case of current efficiency optimizes is this method give, had both realized current distortion minimum
Change, allow DAB power devices to be operated in Sofe Switch again, improve DAB efficiency.
The technical solution of the present invention is as follows：
It is a kind of based on soft-switching process of the current-modulation than DAB that current efficiency optimizes, described DAB (dual-
Active-bridge, double active full-bridge current transformers) by direct voltage source, primary side single-phase full bridge, secondary single-phase full bridge, high frequency every
Formed from transformer, high-frequency inductor L and controller, described primary side single-phase full bridge H14 full control switching devices be S1~S4,
Secondary single-phase full bridge H24 full control switching devices be Q1~Q4；The positive pole of the dc bus of described primary side single-phase full bridge with it is right
The positive pole of direct voltage source is answered to be connected, the negative pole phase of the negative pole of the dc bus of primary side single-phase full bridge and corresponding direct voltage source
Even, the AC of primary side single-phase full bridge is connected by high-frequency inductor L whenever and wherever possible with the primary side of high-frequency isolation transformer；Described
The dc bus positive pole of secondary single-phase full bridge is connected with the positive pole of corresponding DC load, and the dc bus of secondary single-phase full bridge is born
Pole is connected with the negative pole of corresponding DC load, and the AC of secondary single-phase full bridge is connected with high-frequency isolation transformer secondary, institute
The no-load voltage ratio for the high-frequency isolation transformer stated is n:1；The switching device S of described primary side single-phase full bridge1~S4Control signal it is defeated
Enter the switching device Q of end and secondary single-phase full bridge1~Q4Control signal input it is corresponding with described controller switch letter
Number output end be connected；
Described controller includes multiplier, comparator, PI controllers and modulating unit, and multiplier has two signal inputs
End, the voltage V of described DAB secondary DC load is measured respectively2With electric current I2, voltage V2With electric current I2Pass through multiplier meter
Calculate bearing power Po, bearing power PoWith given power PrefK, the control of described modulating unit output switch are exported through comparator
The output end of signal switching device S corresponding with described DAB former secondary full-bridge respectively1~S4With Q1~Q4Control signal
Input be connected；Its feature is that this method comprises the following steps：
1) controller described in presses formula (1) calculating current modulation ratio：
Wherein, I1For DAB input current measured values, I2For the measured value of DAB output currents, n is the no-load voltage ratio of transformer, its
Middle n parameters are preset as initial value；
2) controller described in determines the model of the transimission power under following three different band load according to current-modulation respectively than M
Enclose：
Transmission power range under underloading：
Medium band carries lower transmission power range：
The lower transmission power range of heavy duty：
Wherein, fsFor DAB switching frequency, L is DAB inductance value, PLow、PMedium、PHighRespectively passed under DAB underloadings
Defeated power, medium band carry lower transimission power, the lower transimission power of heavy duty；
3) DAB Sofe Switch phase shifts under different band load are calculated by following formula and compares controlled quentity controlled variable：
Under underloading：
D1,ZVS=k*M
D2,zvs=α × (D1,zvs-D0,zvs) (5)
Under medium band carries：
D1,ZVS=k*M
D2,zvs=0 (6)
Under heavy duty：
D1,ZVS=0
D2,ZVS=0 (7)
Wherein, D1,ZVSRepresent the H of DAB ports 11Internal phase shift ratio, D2,ZVSRepresent the H of DAB secondary end interface 22Inside is moved
Compare, D0,ZVSRepresent two port H of DAB1With H2Between phase shift ratio；K exports for PI controllers, and α represents coefficient, and value is
0.1~1；
4) Sofe Switch condition：
Three controlled quentity controlled variable D1,ZVS, D2,ZVS, D0,ZVSMeet the condition equation below of Sofe Switch：
Under underloading：
Under medium band carries：
Under heavy duty：
5) controller described in compares D by phase shift inside described primary side full-bridge1,ZVS, inside secondary full-bridge phase shift compare D2,ZVS,
D is compared in phase shift between former secondary0,ZVSDrive signal impulse is formed chronologically to input and control described primary side single-phase full bridge (H1)、
Secondary single-phase full bridge (H2) work, complete modulated process, you can realize Sofe Switch of the DAB in full power range, realize DAB
Zero loss in full power range.
Compared with prior art, the features of the present invention is as follows：
1. both having realized current distortion minimum, the Sofe Switch of DAB power devices is realized again, reduces switching loss.
2. optimized according to current-modulation ratio.
Brief description of the drawings
Fig. 1 is the pie graph of DAB system of the present invention.
Fig. 2 is three controlled quentity controlled variable critical surfaces schematic diagrames that DAB of the present invention meets Sofe Switch condition.
Fig. 3 is that DAB of the present invention is operated in the voltage of Sofe Switch, current waveform schematic diagram.
Embodiment
With reference to embodiment and accompanying drawing, the invention will be further described, but the protection model of the present invention should not be limited with this
Enclose.
First referring to Fig. 1, Fig. 1 is the present invention based on soft-switching process of the current-modulation than DAB that current efficiency optimizes
System pie graph.Fig. 2 is three controlled quentity controlled variable critical surfaces schematic diagrames that DAB of the present invention meets Sofe Switch condition, wherein D0,ZVS、
D1,ZVS、D2,ZVSD is used respectively0、D1、D2Represent.
DAB of the present invention based on current efficiency optimization soft-switching process is implemented as follows：
The electric current I of two ports of DAB is measured respectively1, I2With high frequency transformer no-load voltage ratio n, modulated according to formula (1) calculating current
Than M, transformer voltage ratio n is determined by specific device, is input to by designer in controller.Output voltage V2With output current I2
Obtained by measurement, obtaining DAB bands by multiplier carries power, and situation, passing ratio integration (PI) controller, PI are carried according to band
Controller parameter kpAnd kiBy presetting, span is：0.001≤kp≤ 10,0.001≤ki≤10.Then will obtain
PI controllers export k with current-modulation than M, export to the modulating unit in controller, difference is calculated according to formula (5)~(7)
Band carries lower 3 phase shifting control amounts D1,ZVS、D2,ZVS、D0,ZVS, last driving power device S1~S4, Q1~Q4, control DAB power devices
The action of part, realizes Sofe Switch.
As shown in figure 3, vpFor power device S1Voltage waveform, vsFor power device Q1Voltage waveform, iLPower device
Q1Current waveform, there it can be seen that power device S1、Q1Before conducting, existing electric current flows through its anti-paralleled diode,
Voltage has been reduced to zero, and therefore, at this time conducting power device, realizes no-voltage conducting, the i.e. work of Sofe Switch.
As can be seen here, the modulator approach according to the present invention, DAB Sofe Switch is realized under current distortion minimum.
Claims (1)
1. a kind of based on soft-switching process of the current-modulation than DAB that current efficiency optimizes, described DAB by direct voltage source,
Primary side single-phase full bridge H1, secondary single-phase full bridge H2, high-frequency isolation transformer, high-frequency inductor L and controller composition, described primary side
Single-phase full bridge H14 full control switching devices be S1~S4, secondary single-phase full bridge H2Four full control switching devices be Q1~Q4；Institute
The positive pole of the dc bus for the primary side single-phase full bridge stated is connected with the positive pole of corresponding direct voltage source, the direct current of primary side single-phase full bridge
The negative pole of bus is connected with the negative pole of corresponding direct voltage source, and the AC of primary side single-phase full bridge passes through high-frequency electrical whenever and wherever possible
Sense L is connected with the primary side of high-frequency isolation transformer；The dc bus positive pole of described secondary single-phase full bridge and corresponding DC load
Positive pole be connected, the negative pole of the dc bus of secondary single-phase full bridge is connected with the negative pole of corresponding DC load, and secondary is single-phase complete
The AC of bridge is connected with high-frequency isolation transformer secondary, and the no-load voltage ratio of described high-frequency isolation transformer is n:1；Described primary side
The switching device S of single-phase full bridge1~S4The input of control signal and the switching device Q of secondary single-phase full bridge1~Q4Control
The output end of the input of signal switching signal corresponding with described controller is connected；
Described controller includes multiplier, comparator, PI controllers and modulating unit, and multiplier has two signal input parts,
The voltage V of described DAB secondary DC load is measured respectively2With electric current I2, voltage V2With electric current I2Calculated by multiplier
Bearing power Po, bearing power PoWith given power PrefK, described modulating unit output switch control signal are exported through comparator
Output end switching device S corresponding with described DAB former secondary full-bridge respectively1~S4With Q1~Q4Control signal it is defeated
Enter end to be connected；Characterized in that, this method comprises the following steps：
1) controller described in presses formula (1) calculating current modulation ratio：
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Number is preset as initial value；
2) controller described in determines the scope of the transimission power under following three different band load according to current-modulation respectively than M：
Transmission power range under underloading：
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Rate, medium band carry lower transimission power, the lower transimission power of heavy duty；
3) DAB Sofe Switch phase shifts in the case of different band load are calculated by following formula and compares controlled quentity controlled variable：
Under underloading：
D1,ZVS=k*M
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D2,ZVS=0 (7)
Wherein, D1,ZVSRepresent the H of DAB ports 11Internal phase shift ratio, D2,ZVSRepresent the H of DAB secondary end interface 22Internal phase shift ratio,
D0,ZVSRepresent two port H of DAB1With H2Between phase shift ratio；K is that D is compared in phase shift inside the full-bridge of DAB ports 11,ZVSWith current-modulation
Than the coefficient between M, value is that 0.2~0.3, α represents coefficient, and value is 0.1~1；
4) Sofe Switch condition：
Three controlled quentity controlled variable D1,ZVS, D2,ZVS, D0,ZVSMeet the condition equation below of Sofe Switch：
Under underloading：
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5) controller described in compares D by phase shift inside described primary side full-bridge1,ZVS, inside secondary full-bridge phase shift compare D2,ZVS, it is former secondary
D is compared in phase shift between side0,ZVSDrive signal impulse is formed chronologically to input and control described primary side single-phase full bridge (H1), secondary
Single-phase full bridge (H2) work, complete modulated process, you can realize Sofe Switch of the DAB in full power range, realize DAB complete
Zero loss in power bracket.
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| CN112910264A (en) * | 2021-01-25 | 2021-06-04 | 深圳市斯康达电子有限公司 | Five-degree-of-freedom modulation method of double-active bridge type DC-DC converter |
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| CN112583276A (en) * | 2020-11-02 | 2021-03-30 | 西安理工大学 | Bidirectional double-active full-bridge converter and linearization direct power control method thereof |
| CN112910264A (en) * | 2021-01-25 | 2021-06-04 | 深圳市斯康达电子有限公司 | Five-degree-of-freedom modulation method of double-active bridge type DC-DC converter |
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