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CN108988646B - DAB (digital audio broadcasting) optimization control method with voltage transmission ratio larger than 1 under zero-voltage switch - Google Patents

DAB (digital audio broadcasting) optimization control method with voltage transmission ratio larger than 1 under zero-voltage switch Download PDF

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CN108988646B
CN108988646B CN201810694851.9A CN201810694851A CN108988646B CN 108988646 B CN108988646 B CN 108988646B CN 201810694851 A CN201810694851 A CN 201810694851A CN 108988646 B CN108988646 B CN 108988646B
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CN108988646A (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
    • H02M1/0048—Circuits or arrangements for reducing losses
    • 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 invention discloses a DAB (digital audio broadcasting) optimization control method with a voltage transmission ratio larger than 1 under a zero-voltage switch, which is based on a phase shift ratio D between primary and secondary side H bridges of a transformer0And two sides H full bridge inner shift phase ratio D1、D2With three phase-shifting control quantitiesAnd adjusting the voltage and current waveforms according to the magnitude relation. So that the DAB converter can transmit voltage more than 1, i.e. vsGreater than vpUnder the condition of low power, the zero-voltage switch under current optimization is realized, and the working condition of the device is improved.

Description

DAB (digital audio broadcasting) optimization control method with voltage transmission ratio larger than 1 under zero-voltage switch
Technical Field
The invention relates to a DC/DC converter, in particular to a DAB optimal control method with a voltage transmission ratio of more than 1 under zero-voltage switching.
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 zero voltage switch, 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 diagonal full-control switching tube in a primary and secondary bridge, the DAB common and most traditional control method is Single Phase Shift (SPS) control, only the phase between the primary and secondary alternating-current voltages of the high-frequency transformer is controlled by one control quantity, the method is simple in control and easy to realize zero-voltage switching, but the problems of larger power backflow, smaller zero-voltage 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 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 reduce backflow power, reduce current stress of a switching device and zero voltage switching, and the transmission efficiency of the converter is improved.
If the zero-voltage switching is not realized when the full-control switching device is switched on and switched off, power loss is caused, a large amount of heat is generated at the same time, the full-control switching device and peripheral elements are heated, the transmission efficiency, the reliability, the service life and the like of the converter are reduced, and the low-power zero-voltage switching is particularly obvious under the low-power work of the converter, so that the realization of the low-power zero-voltage switching in the high-frequency application of the work of the double-active full-bridge direct-current converter is particularly important, and at present, a plurality of zero-voltage switching control methods for realizing the voltage transmission ratio smaller than 1 exist, but the control methods.
Disclosure of Invention
The invention provides a DAB (digital audio broadcasting) optimization control method with a voltage transmission ratio of more than 1 under a zero voltage switch, which provides a functional relation and a power calculation formula of three phase shift values of triple phase shift control, wherein the relation consists of elementary functions, the calculation is simple and convenient, the low-power segmented zero voltage switch of a converter with the voltage transmission ratio of more than 1 is realized, the reflux power is lower, and the working environment and the reliability of a switch device are improved.
In order to achieve the above object, the technical solution adopted by the present invention is as follows:
a DAB optimization control method with voltage transmission ratio greater than 1 under zero voltage switch 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 with the direct currentVoltage source cathode and 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 first, and the transformer transformation ratio n, the high-frequency inductance L and the frequency f of basic parameters of the converter are setsDesired output voltage value VrefSampling to obtain an input voltage V1An 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 method is characterized in that: the method comprises the following steps:
1) the digital controller calculates the input-output voltage transmission ratio M according to a formula (1):
Figure BDA0001713363420000031
taking M >1 and satisfying the transmission power range determined by the formula (2),
Figure BDA0001713363420000032
2) double-active full-bridge converter D0、D1、D2Calculation of three control quantities:
the corresponding three phase shift control quantities are obtained using the following formula:
Figure BDA0001713363420000041
wherein, T is a half switching period of the double-active full-bridge direct-current converter; for alpha, 0 < alpha < 1, the closer the value of alpha is to 0, the larger the generated backflow power is, namely, the effective value of the inductive current is obviously increased under the same transmission power; correspondingly, the closer the value of α is to 1, the larger dead time is required for the dual-active full-bridge converter to realize zero-voltage switching of all devices;
3) the digital 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-controlled switch devices of the full bridge realize a DAB optimal control method with the voltage transmission ratio larger than 1 under zero-voltage switching through the control method, and realize primary side H1Full bridge, secondary side H2The eight full-control switch devices of the full bridge can be switched at zero voltage.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention can adapt to the condition of any voltage transmission ratio when M is more than 1, and is suitable for the low-power range of the converter.
2. The invention reduces the heating of the device, improves the reliability of the converter and improves the transmission efficiency of the converter.
Drawings
Fig. 1 is a circuit schematic of a DAB converter.
Fig. 2 is a main waveform diagram of the voltage transmission ratio greater than 1 in TPS control.
Fig. 3 is a graph of the inductor current as a function of power when a is varied under the control method.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1 and fig. 2, the method for controlling the zero-voltage switch of the low-power DAB with the voltage transmission ratio of more than 1 is implemented as follows:
the invention discloses a DAB (digital audio broadcasting) optimization control method with a voltage transmission ratio larger than 1 under zero-voltage switching, and a device based on the method comprises 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 the rear bridge arms are respectively connected with one end of a high-frequency inductor L and the negative end of the primary side of a high-frequency transformer, and the other end of the high-frequency inductor L is connected with the high-frequency transformerThe positive end of the primary side is connected; 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 first, and the basic parameters of the converter, namely the transformer transformation ratio n, the high-level inductance L and the frequency f are setsDesired output voltage value VrefSampling to obtain an input voltage V1An 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 method specifically comprises the following steps:
1) the digital controller calculates the input-output voltage transmission ratio M according to a formula (4):
Figure BDA0001713363420000061
taking M >1 and satisfying the transmission power range determined by the formula (5),
Figure BDA0001713363420000062
2) double-active full-bridge converter D0、D1、D2Calculation of three control quantities:
the corresponding three phase shift control quantities are obtained using the following formula:
Figure BDA0001713363420000063
wherein, T is the half-switching period of the double-active full-bridge DC converter. D2Determined by the transmission power. As shown in fig. 3, the closer the value of α is to 0, the larger the generated backflow power is, i.e. the effective value of the inductor current is significantly increased under the same transmission power; correspondingly, the closer the value of α is to 1, the larger dead time is required for the dual-active full-bridge converter to realize zero-voltage switching of all devices;
3) the digital 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-controlled switch devices of the full bridge realize a DAB optimal control method with the voltage transmission ratio larger than 1 under zero-voltage switching through the control method, and realize primary side H1Full bridge, secondary side H2The eight full-control switch devices of the full bridge can be switched at zero voltage.
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)

1.零电压开关下电压传输比大于1的DAB优化控制方法，其特征在于：该方法所基于的装置包括直流电源、高频变压器原边全桥H1、高频变压器副边全桥H2、高频电感L和高频变压器、直流负载、原边输入电容C1、副边输出电容C2以及数字控制器组成；所述高频变压器原边全桥H1由S1～S4四个全控开关器件组成，高频变压器副边全桥H2由Q1～Q4四个全控开关器件组成，所述直流电压源正极与原边输入电容C1的正极、高频变压器原边全桥H1的直流母线正极相连接，直流电压源负极与原边输入电容C1的负极、高频变压器原边全桥H1的直流母线负极相连接；所述高频变压器原边全桥H1前后桥臂两开关管中点分别与高频电感L的一端和高频变压器原边负端相连接，高频电感L的另一端与高频变压器原边正端相连接；所述直流负载的正极与副边输入电容C2正极、高频变压器副边全桥H2的直流母线正极相连接，直流负载负极与副边输入电容C2负极、高频变压器副边全桥H2的直流母线负极相连接；所述高频变压器副边全桥H2前后桥臂两开关管中点分别与高频变压器副边两端相连接，高频变压器变比为n:1；所述高频变压器原边全桥H1的四个全控开关管S1～S4的控制信号输入端和高频变压器副边全桥H2的四个全控开关器件Q1～Q4的控制信号输入端与所述数字控制器的PWM信号输出端相连接；1. A DAB optimization control method with a voltage transfer ratio greater than 1 under zero-voltage switching, characterized in that: the device on which the method is based comprises a DC power supply, a high-frequency transformer primary side full bridge H 1 , and a high-frequency transformer secondary side full bridge H 2 , high frequency inductor L and high frequency transformer, DC load, primary side input capacitor C 1 , secondary side output capacitor C 2 and digital controller; the high frequency transformer primary side full bridge H 1 is composed of S 1 ～ S 4 four The high-frequency transformer secondary side full bridge H2 is composed of four fully-controlled switching devices Q1 - Q4. The positive pole of the DC voltage source and the positive pole of the primary input capacitor C1 , the high-frequency transformer original The positive pole of the DC bus of the side full bridge H1 is connected, the negative pole of the DC voltage source is connected to the negative pole of the input capacitor C1 on the primary side, and the negative pole of the DC bus of the primary side full bridge H1 of the high frequency transformer is connected; The midpoints of the two switch tubes of the front and rear bridge arms of the bridge H1 are respectively connected to one end of the 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 to the positive end of the primary side of the high-frequency transformer; the The positive pole of the DC load is connected to the positive pole of the secondary side input capacitor C2 , the positive pole of the DC bus of the high frequency transformer secondary side full bridge H2 , the DC load negative pole is connected to the secondary side input capacitor C2 negative pole, the high frequency transformer secondary side full bridge H2 The negative pole is connected. The negative poles of the DC bus are connected to each other; the midpoints of the two switch tubes of the front and rear bridge arms of the full bridge H2 on the secondary side of the high-frequency transformer are respectively connected with both ends of the secondary side of the high-frequency transformer, and the transformation ratio of the high-frequency transformer is n:1; The control signal input terminals of the four full-control switch tubes S 1 to S 4 of the primary side full bridge H 1 of the high frequency transformer and the control signals of the four full control switch devices Q 1 to Q 4 of the high frequency transformer secondary side full bridge H 2 The input end is connected with the PWM signal output end of the digital controller; 所述数字控制器包括移相参数计算器和移相调制器这两个部分，首先初始化数字控制器，设定双有源全桥变换器基本参数变压器变比n、高频电感L、输出的PWM波的频率fs，期望输出电压值Vref，采样得到输入电压V1、输出电压V0、输出电流I0，移相参数计算器计算输出电压值为Vref时的输出功率P，通过控制方法计算后输出三个移相信号给所述移相调制器，所述移相调制器的开关控制信号输出端与原副边全桥相对应的全控开关管S1～S4和Q1～Q4相连接；三重移相值为高频变压器原副边H桥之间的移相比D0、原边H1全桥内移相比D1、副边H2全桥内移相比D2三个移相控制量；The digital controller includes two parts: a phase-shifting parameter calculator and a phase-shifting modulator. First, the digital controller is initialized, and the basic parameters of the dual active full-bridge converter are set. Transformer transformation ratio n, high-frequency inductance L, output The frequency f s of the PWM wave, the expected output voltage value V ref , the input voltage V 1 , the output voltage V 0 , and the output current I 0 are obtained by sampling, and the phase-shift parameter calculator calculates the output power P when the output voltage value is V ref , by The control method outputs three phase-shifting signals to the phase-shifting modulator after calculation, and the switch control signal output end of the phase-shifting modulator is the fully - controlled switching transistors S1 - S4 and Q corresponding to the primary and secondary side full bridges Phases 1 to Q 4 are connected; the triple phase shift value is the shift phase between the primary and secondary side H bridges of the high-frequency transformer D 0 , the primary side H 1 full-bridge internal shift phase D 1 , and the secondary side H 2 full-bridge internal shift Compared with the three phase-shifting control quantities of D 2 ; 其特征是：包括以下步骤：It is characterized in that it includes the following steps: 1)所述数字控制器按公式(1)计算出输入输出电压传输比M：1) The digital controller calculates the input-output voltage transmission ratio M according to formula (1):
Figure FDA0002769885280000021
Figure FDA0002769885280000021
 取M>1，且满足式(2)所确定的传输功率范围，Take M>1, and satisfy the transmission power range determined by equation (2),
Figure FDA0002769885280000022
Figure FDA0002769885280000022
 2)双有源全桥变换器D0、D1、D2三个控制量的计算：2) The calculation of the three control variables of the dual active full-bridge converters D 0 , D 1 , and D 2 : 使用下式得到对应的三个移相控制量：Use the following formula to get the corresponding three phase-shift control quantities:
Figure FDA0002769885280000023
Figure FDA0002769885280000023
 其中，V2为直流负载两端的电压，T为双有源全桥直流变换器的半开关周期；对于α，0＜α＜1，α的值越靠近0，产生的回流功率越大，即在相同的传输功率下，显著增加电感电流有效值；相对应的，α的值越靠近1，双有源全桥变换器需要越大的死区时间来实现全部器件的零电压开关；Among them, V 2 is the voltage across the DC load, and T is the half-switching cycle of the dual active full-bridge DC converter; for α, 0<α<1, the closer the value of α is to 0, the greater the generated return power, that is, Under the same transmission power, the effective value of the inductor current is significantly increased; correspondingly, the closer the value of α is to 1, the larger the dead time of the dual active full-bridge converter is required to achieve zero-voltage switching of all devices; 3)所述的数字控制器按所述的高频变压器原副边H桥之间的移相比D0、原边H1全桥内移相比D1、副边H2全桥内移相比D2三个移相控制量形成驱动信号，八个开关管的驱动信号通过输出端口驱动所述原边H1全桥、副边H2全桥的八个全控开关器件，通过以上控制方法即实现一种零电压开关下电压传输比大于1的DAB优化控制方法，实现原边H1全桥、副边H2全桥的八个全控开关器件均能零电压开关。3) The digital controller is compared with D 0 according to the shift between the H-bridges of the primary and secondary sides of the high-frequency transformer, the full-bridge shift of the primary side H 1 is compared with D 1 , and the shift of the secondary side H 2 of the full-bridge is shifted inward. Compared with the three phase-shift control variables of D 2 to form the driving signal, the driving signals of the eight switching tubes drive the eight fully-controlled switching devices of the primary side H 1 full bridge and the secondary side H 2 full bridge through the output port. The control method realizes a DAB optimization control method with a voltage transfer ratio greater than 1 under zero-voltage switching, and realizes that all eight fully-controlled switching devices of the primary side H1 full bridge and the secondary side H2 full bridge can switch at zero voltage.
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