新颖谐振网络零电压零电流并联谐振变流器:本文提出了一种新型并联谐振变流器。它具有一个新颖的谐振网络，由位于隔离变压器原边的一组谐振电感与谐振电容，和副边整流管之后的一个谐振电感三者组成，简称LC+L 谐振网络。不同于传统的PRC，本文提出的具有LC+L 谐振网络的PRC 能够同时实现原边开关管的ZVS 开通和副边整流二极管的ZCS 关断。相比传统LLC 串联谐振变流器，此变流器能够在宽输入电压条件下缩小开关频率的变化范围，并结合软开关特性，进一步降低输入EMI 滤波器的设计难度，并提高变流器的工作效率。本文基于相平面分析法，详细分析了该变流器的工作特性，并给出了此变流器详细的设计方法，最后，一台200V-400V，54V/10A 样机试验验证了该变流器的优良性能。Abstract: A novel soft-switching parallel resonant converter (PRC) was presented in this paper. The proposed converterhas a novel resonant tank, including a resonant inductor and a resonant capacitor in the primary side, and a resonant inductoruniquely located after the output stage rectifiers, named as “LC+L” resonant tank. Different from the conventional PRC, theoperation principle of the proposed converter can easily facilitate both the Zero Voltage Switching (ZVS) for primary side switches and Zero Current Switching (ZCS) for the output rectifiers. Besides, the proposed converter narrows the switching frequency deviation under wide input voltage range applications compared with the conventional LLC serial resonant converter (SRC), which, as well as the benefits of the soft-switching conditions, helps to ease EMI filter design and improves efficiency. Detailed working principles of the proposed converter were presented, and analysis based on state-plane approach and design considerations of this converter were given. Lastly, prototype of 200V-400V input, 54V/10A output, was developed to verify the validity and applicability of this topology.关键词：并联谐振变流器；谐振网络；零电压开关；零电流开关；电磁干扰。Key words: Parallel resonant converter; Resonant tank; Zero voltage switching; Zero current switching; EMI.