交錯式升壓電路之單電流感測器電流平衡控制

Abstract

電壓調節性能和電流平衡性能對交錯式升壓電路很重要。本文推導出控制訊號對輸出電壓以及控制訊號對電流不平衡之小訊號轉移函數。從結果顯示，電壓調節迴路和電流平衡迴路互為解耦合關係。除此之外，本論文亦提出單感測取樣策略，使用單一感測器可各別得知每相電感電流的平均值。而電壓調節控制器和電流平衡控制器皆採用設計之PI形式控制器，並以FPGA (Field Programmable Gate Array)晶片實現控制器，從模擬與實作結果來驗證所提出之電流平衡控制。

For interleaved boost converter, both voltage regulation and current balance are important. In the thesis, the small-signal transfer function between the two control signals and the two outputs – output voltage and current imbalance are derived. The results show that the voltage regulation loop and the current balancing loop are decoupled. Additionally, a single-sensor sampling strategy is proposed to obtain both average inductor currents. Then, two independent PI-type controllers are designed to implement the voltage regulation controller and the current balance controller, respectively. All the controllers are implemented in Field Programmable Gate Array (FPGA). The provided simulation and experimental results verify the proposed current balancing control.