为全面揭示具有电容型滤波器的并联谐振变换器的电路特性，首先，对并联谐振变换器的两种工作模式进行了原理分析，建立了相应的数学模型．然后，讨论了两种工作模式下并联谐振变换器的电路特性，指出在电路等效输出电压小于输入电压时，输入电流线性变化．最后，推导了可用于电路元件参数设计的表达式，提出了满足设计需求的并联谐振变换器谐振元件参数的设计方法．仿真结果表明，文中分析与设计方法是正确的．

In order to fully reveal the circuit characteristics of the parallel resonant converter with capacitive outputfilter,the principle of the two operational modes of the converter is analyzed and the corresponding mathematicalmodels are constructed.Then,the circuit characteristics of the converter in the two operating modes are discussedand a linear variation of the input current is revealed when the equivalent output voltage is less than the input one.Finally,some expressions are deduced to design circuit component parameters,and a design method is proposed toobtain component parameters meeting the application requirements of the parallel resonant converter.Simulated resultsindicate that the above analysis and the proposed design method are both correct.