雙昇壓全橋型功因修正電路之無電流感測控制

Abstract

本論文以雙昇壓全橋型功因修正電路實現無電流感測控制，其電源架構不同於傳統全橋型電路的開關串聯架構，所以不存在開關短路擊穿的問題，開關截止時的電感電流透過獨立外接之快速二極體對輸出電容釋能，所以快速二極體可被優化，因此在效率表現上較優異，而在控制方法上，只單純迴授輸出電壓及輸入電壓兩組信號，減少了控制架構的複雜度。透過模擬結果顯示無電流感測控制的功率因數與諧波電流值均能在規範值內，最後再經由電路實作，驗證了雙昇壓全橋型功因修正電路無電流感測控制確實具有高功因及改善電流諧波之特性。

This thesis presents the improvement of Full-bridge power factor corrector (PFC) converter to implement the sensorless control method. The circuit topology is different from series switching components of tranditional Full-bridge converter. And there is not the shot-through problem. The freewheeling current flow through the independent diode instead of the body diodes of the switches, then the diodes can be designed otimally. In aspect of controlling method, the sensorless control only has two voltage loop which simplies the control structure and reduce the number of sensors. Siumlation results showes the power factor and current harmonics both in specification. Finally, the implement results are provid to verify the high power factor and improvement current harmonics.