CN108900089B - DAB full-power soft switching control method applied to voltage transmission ratio larger than 1 - Google Patents

DAB full-power soft switching control method applied to voltage transmission ratio larger than 1 Download PDF

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CN108900089B
CN108900089B CN201810694835.XA CN201810694835A CN108900089B CN 108900089 B CN108900089 B CN 108900089B CN 201810694835 A CN201810694835 A CN 201810694835A CN 108900089 B CN108900089 B CN 108900089B
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full
phase
bridge
shift
frequency transformer
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CN108900089A (en
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杭丽君
沈凯
童安平
李国文
何远彬
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Hangzhou Dianzi University
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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
    • H02M3/33569—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 several active switching elements
    • H02M3/33576—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 several active switching elements having at least one active switching element at the secondary side of an isolation transformer
    • 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
    • H02M1/0003—Details of control, feedback or regulation circuits
    • H02M1/0012—Control circuits using digital or numerical techniques
    • 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

Abstract

The invention provides a DAB full-power soft switching control method applied to a voltage transmission ratio larger than 1, which controls a corresponding switching device by adjusting PWM output through a digital controller. In theoretical calculation, PWM output mainly adjusts primary and secondary side H-bridges of high-frequency transformerRelative outward shift of D0Primary side full bridge internal shift phase ratio D1Secondary side full bridge inner shift phase ratio D2Three phase-shift control quantities enable the double-active full-bridge direct-current converter to realize soft switching under current optimization in a full-power range with a voltage transmission ratio larger than 1. The power loss of the converter is reduced while the soft switching range is widened, the overall efficiency of the converter is improved, the circuit structure of the converter does not need to be changed, the implementation is easy, the applicability is wide, and the high-frequency isolation switch power supply can be applied to a high-frequency isolation switch power supply.

Description

DAB full-power soft switching control method applied to voltage transmission ratio larger than 1
Technical Field
The invention relates to a DC/DC converter, in particular to a DAB full-power soft switching control method applied to a voltage transmission ratio of more than 1.
Background
With the development of new energy, direct-current micro-grid systems, electric vehicle systems and other technologies and the continuous improvement of electrical equipment technologies, the high-power bidirectional direct-current converter receives more and more attention. Among them, the Dual Active Bridge (DAB) dc converter has attracted attention because of its advantages of electrical isolation, symmetrical structure, high reliability, high power density, easy implementation of soft switching, etc. The DAB common control method is phase shift control, the magnitude and the direction of transmission power are controlled by controlling the phase between the primary and secondary alternating-current voltages of the transformer and the opening phase difference of a full-bridge diagonal full-control switching tube of the primary and secondary sides, the DAB common and most traditional control method is Single Phase Shift (SPS) control, only the phase difference between the primary and secondary alternating-current voltages of the high-frequency transformer is a control quantity, the method is simple in control and easy to realize soft switching, but the problems of large power backflow, small soft switching range, large device current stress and the like exist when the input-output voltage ratio is not 1. In order to solve these problems, researchers have made many efforts, and have proposed an Extended Phase Shift (EPS) control method, a Dual Phase Shift (DPS) control method, and a Triple Phase Shift (TPS) control method on the basis of the single phase shift control. The TPS has three phase-shifting control quantities, the SPS, the DPS and the EPS are simplified or special forms of the TPS, the three control quantities are more general, the control flexibility is improved, constraint conditions among the three control quantities can be obtained through analysis, the three control quantities obtained through the constraint conditions can realize reduction of backflow power, reduction of current stress of a switching device and soft switching, and the transmission efficiency of the converter is improved. If the soft switching is not realized during the on-off of the full-control switch device, power loss is caused, and a large amount of heat is generated at the same time, so that the full-control switch device and peripheral elements are heated, the transmission efficiency, the reliability, the service life and the like of the converter are reduced, and therefore, the realization of the soft switching is particularly important when the double-active full-bridge direct current converter works in high-frequency application.
Disclosure of Invention
In view of the above problems, the invention provides a DAB full-power soft switching control method applied to a voltage transmission ratio greater than 1, the method provides a function relation of three phase shift values controlled by TPS, the relation is composed of elementary functions, the calculation is simple and convenient, the applicability is wide, the soft switching in a full-power range is realized on the basis of smaller current stress of devices, and the transmission efficiency and the reliability of a converter are improved.
In order to achieve the above object, the technical solution adopted by the present invention is as follows:
a DAB full-power soft switch control method applied to a voltage transmission ratio greater than 1 is based on a device comprising a direct-current power supply and a primary side full-bridge H of a high-frequency transformer1Secondary side full bridge H of HF transformer2High-frequency inductor L, high-frequency transformer, direct-current load and primary-side input capacitor C1Secondary output capacitor C2And a digital controller; the primary side full bridge H of the high-frequency transformer1From S1～S4Four full-controlled switch devices, secondary side full-bridge H of high-frequency transformer2From Q1～Q4Four full-control switch devices, the positive pole of the DC voltage source and the primary side input capacitor C1Primary side full bridge H of high frequency transformer1The positive pole of the direct current bus is connected, the negative pole of the direct current voltage source is connected with the primary side input powerContainer C1Primary side full bridge H of high frequency transformer1The negative poles of the direct current buses are connected; the primary side full bridge H of the high-frequency transformer1The middle points of the two switching tubes of the front and rear bridge arms are respectively connected with one end of a high-frequency inductor L and the negative end of the primary side of the high-frequency transformer, and the other end of the high-frequency inductor L is connected with the positive end of the primary side of the high-frequency transformer; the positive electrode and the secondary side of the direct current load input capacitor C2Secondary side full bridge H of positive pole high frequency transformer2The positive pole of the direct current bus is connected, the negative pole of the direct current load is connected with the secondary input capacitor C2Full bridge H with negative pole and secondary side of high-frequency transformer2The negative poles of the direct current buses are connected; the secondary side full bridge H of the high-frequency transformer2The middle points of the two switching tubes of the front and rear bridge arms are respectively connected with two ends of the secondary side of the high-frequency transformer, and the transformation ratio of the high-frequency transformer is n: 1;
the primary side full bridge H of the high-frequency transformer1Four full-control switch tubes S1～S4Control signal input terminal and secondary side full bridge H of high-frequency transformer2Four fully-controlled switching devices Q1～Q4The control signal input end of the digital controller is connected with the PWM signal output end of the digital controller;
the digital controller comprises a phase-shift parameter calculator and a phase-shift modulator, and is initialized firstly, the transformation ratio n of a basic parameter transformer of the double-active full-bridge converter, the high-frequency inductance L and the frequency f of the output PWM (pulse-width modulation) wave are setsDesired output voltage value VrefSampling to obtain an input voltage V1Sampling to obtain output voltage V0Output current I0The phase-shift parameter calculator calculates the output voltage value as VrefThe time output power P is calculated by a control method and then outputs three phase-shift signals to the phase-shift modulator, and the switch control signal output end of the phase-shift modulator and a full-control switch tube S corresponding to the original secondary side full bridge1～S4And Q1～Q4Connecting; the triple phase shift value is the phase shift ratio D between the primary and secondary H bridges of the high-frequency transformer0Primary side H1Full bridge phase shift ratio D1Minor side H2Full bridge phase shift ratio D2Three phase-shift control quantities;
the triple phase shift value is the phase shift ratio D between the primary and secondary H bridges of the high-frequency transformer0Primary side H1Full bridge phase shift ratio D1Minor side H2Full bridge phase shift ratio D2Three phase-shift control quantities;
the method specifically comprises the following steps:
1) the controller calculates the input-output voltage transmission ratio according to a formula (1):
Figure BDA0001713363150000031
2) taking M to be more than 1, and determining three transmission power sections by the digital controller according to the input-output voltage transmission ratio:
low-power segmentation:
Figure BDA0001713363150000032
medium power segmentation:
Figure BDA0001713363150000033
high-power segmentation:
Figure BDA0001713363150000041
wherein, PLTransmitting power, P, for low power segmentsMTransmitting power, P, for a medium power segmentHTransmitting power for the high power segment;
3) double-active full-bridge converter D0、D1、D2Calculation of three control quantities:
when the transmission power is in the low power section, the corresponding three phase-shift control quantities are obtained by using the following formula:
Figure BDA0001713363150000042
when the transmission power is in the medium power section, the corresponding three phase-shifting control quantities are obtained by using the following formula:
Figure BDA0001713363150000043
when the transmission power is in a high-power section, the corresponding three phase-shifting control quantities are obtained by using the following formula:
Figure BDA0001713363150000044
wherein, T is the half-switching period of the double-active full-bridge DC converter.
4) The phase-shift controller is used for controlling the phase-shift ratio D between the primary and secondary side H bridges of the high-frequency transformer0Primary side H1Full bridge phase shift ratio D1Minor side H2Full bridge phase shift ratio D2Three phase-shift control quantities form driving signals, and the driving signals of the eight switching tubes drive the primary side H through an output port1Full bridge, secondary side H2Eight full-control switch devices of the full bridge realize DAB full-power soft switch control applied to the voltage transmission ratio of more than 1 by the control method, and realize primary side H1Full bridge, secondary side H2Eight full-control switching devices of the full bridge can be in soft switching; the power loss is reduced and the converter efficiency is improved.
The invention discloses a DAB full-power soft switch control method applied to a voltage transmission ratio larger than 1, which is characterized in that a power expression and a high-frequency inductance current expression under each mode are obtained through analysis, a phase shift parameter range for realizing soft switching is obtained according to a soft switching constraint condition, each power point has countless phase shift parameter groups to realize soft switching, and finally an analytical expression among control quantities is obtained through research, so that the phase shift parameter group uniquely corresponding to the power point can be solved, the current stress is smaller while the soft switching is realized, and the transmission efficiency is improved.
Compared with the prior art, the invention has the following beneficial effects:
1. the soft switch has the advantages of simple and convenient calculation, is composed of elementary functions and does not contain complex calculation.
2. The invention can adapt to the condition of any voltage transmission ratio when M is more than 1 and is suitable for the whole power range of the converter.
3. The invention improves the working condition of the device, increases the reliability of the device and improves the transmission efficiency of the converter.
Drawings
Fig. 1 is a system schematic diagram of soft switching of a dual-active full-bridge direct-current converter based on triple phase shifting.
FIG. 2 is a timing chart of driving signals in TPS control and three phase-shift control quantities D0、D1、D2And the drive signal.
Fig. 3 is a control flow chart.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1, fig. 2 and fig. 3, a DAB full-power soft switching control method applied to a voltage transmission ratio greater than 1 according to the present invention is implemented as follows:
the invention relates to a DAB full-power soft switching control method applied to a voltage transmission ratio of more than 1, and the method is based on a device comprising a direct-current power supply and a primary side full bridge H of a high-frequency transformer1Secondary side full bridge H of HF transformer2High-frequency inductor L, high-frequency transformer, direct-current load and primary-side input capacitor C1Secondary output capacitor C2And a digital controller; the primary side full bridge H of the high-frequency transformer1From S1～S4Four full-controlled switch devices, secondary side full-bridge H of high-frequency transformer2From Q1～Q4Four full-control switch devices, the positive pole of the DC voltage source and the primary side input capacitor C1Primary side full bridge H of high frequency transformer1The positive pole of the direct current bus is connected, the negative pole of the direct current voltage source is connected with the primary side input capacitor C1Primary side full bridge H of high frequency transformer1The negative poles of the direct current buses are connected; the primary side full bridge H of the high-frequency transformer1The middle points of the two switching tubes of the front and rear bridge arms are respectively connected with one end of a high-frequency inductor L and the negative end of the primary side of the high-frequency transformer, and the other end of the high-frequency inductor L is connected with the positive end of the primary side of the high-frequency transformer; the positive electrode and the secondary side of the direct current load input capacitor C2Secondary side full bridge H of positive pole high frequency transformer2The positive pole of the direct current bus is connected, the negative pole of the direct current load is connected with the secondary input capacitor C2The negative electrode is connected with the negative electrode of a direct current bus of a secondary full bridge H2 of the high-frequency transformer; the secondary side full bridge H of the high-frequency transformer2The middle points of the two switching tubes of the front and rear bridge arms are respectively connected with two ends of the secondary side of the high-frequency transformer, and the transformation ratio of the high-frequency transformer is n: 1; the primary side full bridge H of the high-frequency transformer1Four full-control switch tubes S1～S4Control signal input terminal and secondary side full bridge H of high-frequency transformer2Four fully-controlled switching devices Q1～Q4The control signal input end of the digital controller is connected with the PWM signal output end of the digital controller;
the digital controller comprises a phase-shift parameter calculator and a phase-shift modulator, and is initialized firstly, the transformation ratio n of a basic parameter transformer of the double-active full-bridge converter, the high-frequency inductance L and the frequency f of the output PWM (pulse-width modulation) wave are setsDesired output voltage value VrefSampling to obtain an input voltage V1Sampling to obtain output voltage V0Output current I0The phase-shift parameter calculator calculates the output voltage value as VrefThe time output power P is calculated by a control method and then outputs three phase-shift signals to the phase-shift modulator, and the switch control signal output end of the phase-shift modulator and a full-control switch tube S corresponding to the original secondary side full bridge1～S4And Q1～Q4Connecting; the triple phase shift value is the phase shift ratio D between the primary and secondary H bridges of the high-frequency transformer0Primary side H1Full bridge phase shift ratio D1Minor side H2Full bridge phase shift ratio D2Three phase-shift control quantities;
the triple phase shift value is the phase shift ratio D between the primary and secondary H bridges of the high-frequency transformer0Primary side H1Full bridge phase shift ratio D1Minor side H2Full bridge phase shift ratio D2Three phase-shift control quantities;
the method specifically comprises the following steps:
1) the controller calculates the input-output voltage transmission ratio according to a formula (1):
Figure BDA0001713363150000071
2) taking M to be more than 1, and determining three transmission power sections by the digital controller according to the input-output voltage transmission ratio:
low-power segmentation:
Figure BDA0001713363150000072
medium power segmentation:
Figure BDA0001713363150000073
high-power segmentation:
Figure BDA0001713363150000074
wherein, PLTransmitting power, P, for low power segmentsMTransmitting power, P, for a medium power segmentHTransmitting power for the high power segment;
3) double-active full-bridge converter D0、D1、D2Calculation of three control quantities:
when the transmission power is in the low power section, the corresponding three phase-shift control quantities are obtained by using the following formula:
Figure BDA0001713363150000075
when the transmission power is in the medium power section, the corresponding three phase-shifting control quantities are obtained by using the following formula:
Figure BDA0001713363150000081
when the transmission power is in a high-power section, the corresponding three phase-shifting control quantities are obtained by using the following formula:
Figure BDA0001713363150000082
wherein, T is the half-switching period of the double-active full-bridge DC converter.
4) The phase-shift controller is used for controlling the phase-shift ratio D between the primary and secondary side H bridges of the high-frequency transformer0Primary side H1Full bridge phase shift ratio D1Minor side H2Full bridge phase shift ratio D2Three phase-shift control quantities form driving signals, and the driving signals of the eight switching tubes drive the primary side H through an output port1Full bridge, secondary side H2Eight full-control switch devices of the full bridge realize DAB full-power soft switch control applied to the voltage transmission ratio of more than 1 by the control method, and realize primary side H1Full bridge, secondary side H2Eight full-control switching devices of the full bridge can be in soft switching; the power loss is reduced and the converter efficiency is improved.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included in the scope of the present invention.

Claims (1)

1. A DAB full-power soft-switching control method with voltage transfer ratio greater than 1 is based on a dual-active full-bridge converter, which comprises a DC voltage source, a primary full-bridge H of a high-frequency transformer1Secondary side full bridge H of HF transformer2High-frequency inductor L, high-frequency transformer, direct-current load and primary-side input capacitor C1Secondary side output electricityContainer C2And a digital controller; the primary side full bridge H of the high-frequency transformer1From S1～S4Four full-controlled switch devices, secondary side full-bridge H of high-frequency transformer2From Q1～Q4Four full-control switch devices, the positive pole of the DC voltage source and the primary side input capacitor C1One end of, a primary side full bridge H of a high frequency transformer1The positive pole of the direct current bus is connected, the negative pole of the direct current voltage source is connected with the primary side input capacitor C1Another end of the high-frequency transformer, a primary side full bridge H1The negative poles of the direct current buses are connected; the primary side full bridge H of the high-frequency transformer1The middle points of the two switching devices of the front bridge arm and the rear bridge arm are respectively connected with one end of a high-frequency inductor L and a primary synonym end of a high-frequency transformer, and the other end of the high-frequency inductor L is connected with a primary synonym end of the high-frequency transformer; the positive electrode of the direct current load and the secondary side output capacitor C2Secondary side full bridge H of positive pole high frequency transformer2The positive pole of the direct current bus is connected, the negative pole of the direct current load is connected with the secondary output capacitor C2Full bridge H with negative pole and secondary side of high-frequency transformer2The negative poles of the direct current buses are connected; the secondary side full bridge H of the high-frequency transformer2The middle points of the two switching devices of the front bridge arm and the rear bridge arm are respectively connected with two ends of the secondary side of the high-frequency transformer, and the transformation ratio of the high-frequency transformer is n: 1; the primary side full bridge H of the high-frequency transformer1Four fully-controlled switching devices S1～S4Control signal input terminal and secondary side full bridge H of high-frequency transformer2Four fully-controlled switching devices Q1～Q4The control signal input end of the digital controller is connected with the PWM signal output end of the digital controller;
the digital controller comprises two parts of a phase-shift parameter calculator and a phase-shift controller, and is initialized firstly, the transformation ratio n of a basic parameter transformer of the double-active full-bridge converter, the high-frequency inductance L and the frequency f of the output PWM (pulse-width modulation) wave are setsDesired output voltage value VrefSampling to obtain an input voltage V1Sampling to obtain output voltage V0Output current I0The phase-shift parameter calculator calculates the output voltage value as VrefThe time output power P is calculated by a control method and then three phase shift signals are outputThe signal is given to the phase-shift controller, and the switch control signal output end of the phase-shift controller is corresponding to the full-control switch device S of the primary and secondary full-bridges1～S4And Q1～Q4Connecting; the triple phase shift value is the phase shift ratio D between the primary and secondary H bridges of the high-frequency transformer0Primary side full bridge H1Internal shift phase ratio D1Secondary side full bridge H2Internal shift phase ratio D2Three phase-shift control quantities;
the method is characterized in that: the method specifically comprises the following steps:
1) the digital controller calculates the input-output voltage transmission ratio according to a formula (1):
Figure FDA0002903922380000021
2) taking M >1, the digital controller determines three transmission power sections according to the input-output voltage transmission ratio:
low-power segmentation:
Figure FDA0002903922380000022
medium power segmentation:
Figure FDA0002903922380000023
high-power segmentation:
Figure FDA0002903922380000024
wherein, PLTransmitting power, P, for low power segmentsMTransmitting power, P, for a medium power segmentHTransmitting power for the high power section;
3) double-active full-bridge converter D0、D1、D2Calculation of three control quantities:
when the transmission power is in the low power section, the corresponding three phase-shift control quantities are obtained by using the following formula:
Figure FDA0002903922380000025
when the transmission power is in the medium power section, the corresponding three phase-shifting control quantities are obtained by using the following formula:
Figure FDA0002903922380000031
when the transmission power is in a high-power section, the corresponding three phase-shifting control quantities are obtained by using the following formula:
Figure FDA0002903922380000032
wherein, T is the half-switching period of the double-active full-bridge converter;
4) the phase-shift controller is used for controlling the phase-shift ratio D between the primary and secondary side H bridges of the high-frequency transformer0Primary side full bridge H1Internal shift phase ratio D1Secondary side full bridge H2Internal shift phase ratio D2Three phase-shift control quantities form driving signals, and the driving signals of the eight switching devices drive the primary side full bridge H through the output port1Secondary side full bridge H2The eight full-control switching devices realize DAB full-power soft switching control with voltage transmission ratio greater than 1 and primary side full-bridge H through the control method1Secondary side full bridge H2The eight fully-controlled switching devices can be in soft switching.
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CN107241021A (en) * 2017-08-03 2017-10-10 上海交通大学 DAB converters global optimization closed loop control method under a kind of triple phase shifting controls
CN107425729A (en) * 2017-08-03 2017-12-01 国网江苏省电力公司南京供电公司 It is a kind of based on soft-switching process of the current-modulation than DAB that current efficiency optimizes
CN107425730A (en) * 2017-08-03 2017-12-01 国网江苏省电力公司南京供电公司 A kind of soft-switching process of the DAB based on current efficiency optimization

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