新穎諧振網絡零電壓零電流并聯諧振變流器:本文提出了一種新型并聯諧振變流器。它具有一個新穎的諧振網絡，由位于隔離變壓器原邊的一組諧振電
感與諧振電容，和副邊整流管之后的一個諧振電感三者組成，簡稱LC+L 諧振網絡。不同于傳統的PRC，本文提出
的具有LC+L 諧振網絡的PRC 能夠同時實現原邊開關管的ZVS 開通和副邊整流二極管的ZCS 關斷。相比傳統LLC 串聯諧振變流器，此變流器能夠在寬輸入電壓條件下縮小開關頻率的變化范圍，并結合軟開關特性，進一步降低輸入EMI 濾波器的設計難度，并提高變流器的工作效率。本文基于相平面分析法，詳細分析了該變流器的工作特性，并
給出了此變流器詳細的設計方法，最后，一臺200V-400V，54V/10A 樣機試驗驗證了該變流器的優良性能。
Abstract: A novel soft-switching parallel resonant converter (PRC) was presented in this paper. The proposed converter
has a novel resonant tank, including a resonant inductor and a resonant capacitor in the primary side, and a resonant inductor
uniquely located after the output stage rectifiers, named as “LC+L” resonant tank. Different from the conventional PRC, the
operation 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.
關鍵詞：并聯諧振變流器；諧振網絡；零電壓開關；零電流開關；電磁干擾。
Key words: Parallel resonant converter; Resonant tank; Zero voltage switching; Zero current switching; EMI.