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系统地分析了高于谐振频率工作的并联谐振ＤＣ／ＤＣ变换器的工作原理，讨论了无损电容Ｃ和Ｃ２以及ＭＯＳＦＥＴ寄生二极管Ｄ１和Ｄ２对ＭＯＳＦＥＴ零电压开关特性的影响。文中根据电路工作中电压和电流的相对关系，把谐振逆变器的工作状态分解成Ａ，Ｂ两种工作模式，利用恒流模型和状态空间分析法导出电路的稳态解，研究了电路在稳态状态下状态变量初值Ｉ０和Ｕｃｏ的确定方法和主要功率器件的工作区间长度，文中还给出了确定增振变换器中ＭＯＳＦＥＴ的平均电流、电感电流有效值Ｉｒ等主要参数额定值的表达式及其设计曲线。最后给出一个输出为１６０Ｗ／２８Ｖ、谐振频率为１００ｋＨｚ和变换效率达８９．９％的并联谐振变换器的设计实例和实验波形。
The working principle of the parallel resonant DC / DC converter operating above the resonant frequency is systematically analyzed. The influence of lossless capacitors C and C2 and MOSFET parasitic diodes D1 and D2 on MOSFET zero voltage switching characteristics is discussed. According to the relative relationship between voltage and current in the circuit work, the working condition of the resonant inverter is decomposed into A and B working modes. The steady-state model and the state space analysis method are used to derive the steady-state solution of the circuit. The steady state state variable initial value I0 and Uco determine the method and the main power device working interval length, the article also gives the vibration converter to determine the average current, inductor current rms and other main parameters of the rated value Expression and its design curve. Finally, a design example and experimental waveforms of a parallel resonant converter with an output of 160W / 28V, a resonant frequency of 100kHz and a conversion efficiency of 89.9% are given.