有源鉗位正激變換器雙環(huán)小信號建模分析

摘要：根據(jù)狀態(tài)空間平均法建立了有源鉗位正激變換器連續(xù)導電模式下的小信號模型，以此分別得出等效功率級傳遞函數(shù)和電壓環(huán)路傳遞函數(shù)，并且使用MATLAB軟件繪制了系統(tǒng)傳遞函數(shù)的幅頻特性曲線并分析了鉗位電路對系統(tǒng)傳遞函數(shù)幅頻特性曲線的影響，最后對環(huán)路進行了補償設計。 敘詞：有源鉗位正激變換器 雙環(huán) 峰值電流 小信號 Abstract：A small signal model of active clamp forward fedback-flyback convert with CCM mode is built by state-space averaging approach. The transfer functions of equivalent power and open-loop voltage are presented, respectively. The amplitude-frequency curve is ploted by the Matlab simulation, and the analysis of the influence of the active-clamp circuit is also presented. Last, the feedback loop compensation design is given. Keyword：Active-clamp forward converter, Double circle, Peak current, Small signal