推挽正激軟開關電路的實現與比較

摘要：文章研究了推挽正激軟開關電路實現的條件與方法，提出了三種軟開關諧振網絡，簡單介紹了軟開關電路的工作原理；并從能量的角度對各個諧振網絡進行了分析比較，說明了各自的特點，并在此基礎上詳細地給出了各方案下的諧振參數設計準則。最后根據理論分析設計并研制了一臺76V/1000W(80KHz)的原理樣機。通過實驗對比，驗證了理論分析的正確性和各方案的可行性，該電路在低壓大電流場合具有廣闊的應用前景。 敘詞：軟開關，推挽正激，ZCS，ZCT,輔助繞組 Abstract：The condition and method are studied in this paper for dealing with achieving the ZCS&ZCT. Meanwhile, introduce three kinds of resonant network; analyze their work principle simply and respective characters according to the tank current energy. Design guidance of the network parameters are given in detail based on analysis above and the critical parameters are identified. In the end, The operation, analysis, features and design considerations are illustrated and verified on a 76V/1KW 80KHZ MOSFET based experimental circuit. It brings about good prospect in low voltage /high current applied field. Keyword：soft-switch；push-pull forward；Zero-Current-Switching(ZCS)；Zero-Current-transition(ZCT) ；auxiliary winding