为了获得单级隔离型升压半桥DC/DC变换器的软开关工作条件.对其工作原理和换流过程进行分析.通过稳态参数计算、开关管关闭工作模态的等效电路解析以及微分方程运算,指出了其软开关过程本质上是变压器漏感和开关管并联电容准谐振过程,并获得了实现软开关应满足的特征阻抗与变换器稳态参数之间的不等式关系,该不等式可以作为设计该变换器的依据.使用Matlab/Simulink进行了电路仿真,仿真结果表明,使用推导出的条件进行变换器软开关参数设计方便、准确,实用性较强.%The working principle and current flow of single-stage isolated Boost haft-bridge DC/DC converter are analyzed to achieve its ZVS(Zero-Voltage Switching) conditions. By calculating the steady state parameters,analyzing the working mode when switches are off and solving the differential equations,it is revealed that,the ZVS is essentially the quasi resonance procedure between the leak inductance of transformer and the parallel capacitor of switch. The inequality between the equivalent impedance and the steady state parameters of converter is built,which could be used to design the converter. Circuit simulation is carried out with Matlab/Simulink. Simulative results show that,the converter design with the conditions deduced is convenient,precise and practicable.
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