一種新穎的ZVZCS PWM全橋變換器

摘要：提出了一種新穎的零電流零電壓開關（ZCZVS）PWM全橋變換器，通過增加一個輔助電路的方法實現了變換器的軟開關。與以往的ZCZVS PWM 全橋變換器相比，所提出的新穎變換器具有電路結構簡單、整機效率高以及電流環自適應調整等優點，這使得它特別適合高壓大功率的應用場合。文章詳細分析了該變換器的工作原理及電路設計，并在一臺功率為4kW、工作頻率為80kHz的通信用開關電源裝置上得到了實驗驗證。 敘詞：全橋變換器 零電壓開關 零電流開關 軟開關 脈寬調制 Abstract：A novel zero-voltage and zero-current -switching (ZVZCS) full-bridge pulse-width-modulated (PWM) converter with a simple auxiliary circuit is presented in this paper. The proposed novel converter has such advantages as simple auxiliary circuit, high overall efficiency and self-adjustment of the circulating current with compared to previous ZVZCS Full-Bridge PWM Converters, which make the proposed converter suitable for high voltage and high power applications. The operation principle and the circuit design of the converter are analyzed in detail. The proposed scheme is verified on the 4kW prototype converter operating at 80 kHz. Keyword：ull-bridge converter; zero-voltage-switching; zero-current-switching; soft-switching; PWM