雙極性移相控制電壓源高頻交流環節AC/AC變換器研究*

摘要：　　提出了一類雙極性移相控制電壓源高頻交流環節AC/AC變換器，以半橋全波式電路拓撲為例，深入研究了這類變換器的穩態工作原理，獲得了變換器功率器件實現軟開關的設計準則。借助輸出周波變換器換流重疊、輸入電壓極性選擇和輸出濾波電感電流極性選擇，實現了變壓器漏感能量和輸出濾波電感電流的自然換流，解決了周波變換器固有的電壓過沖和環流問題，實現了輸入周波變換器功率器件的零電壓ZVS開關和輸出周波變換器功率器件的零電流ZCS開關，為獲得新型正弦交流穩壓器和電子變壓器奠定了關鍵技術基礎。仿真與原理試驗結果均證實了雙極性移相控制電壓源高頻交流環節AC/AC變換器的正確性與先進性。 敘詞：AC/AC變換器 周波變換器 高頻交流環節 雙極性移相控制 軟開關 Abstract：　　The bi-polarity Phase-shifted controlled voltage mode AC/AC converters with high frequency ac link are presented．Steady operation principle of the converters is deeply investigated, and the design criterion for power devices of the converters to realize soft-switching is obtained, the half bridge-full wave mode circuit topology for example．By using commutation overlap of the output cycloconverter and polarity selection of the input voltage and output filtering inductance current，the leakage inductance energy and the output filtering inductance current are naturally commutated，and the surge voltage and surge current of the cycloconverters are overcome，and ZVS switching of power devices in the input cycloconverter and ZCS switching of power devices in the output cycloconverter are realized．The converters lay the key technical foundation on new-type regulated sinusoidal ac power supply and electronic transformer．The accuracy and advancement of the bi-polarity phase-shifted controlled voltage mode AC/AC converters with high frequency ac link are verified by the simulation and principle test． Keyword：AC/AC converters Cycloconverter High frequency ac link Bi-polarity phase-shifted control Soft-switching