無橋式功因校正昇壓型整流器之無電流感測控制

Abstract

本篇論文是採用無橋式功率校正昇壓型整流器，實現無電流感測迴路架構。在控制方法上，不同於傳統多迴路電流感測控制必須偵測輸入電壓、輸出電壓以及電感電流，本論文提出一只感測輸入電壓及輸出電壓的控制，在不迴授輸入電流下，可以不用考慮電流取樣及偵測，減少控制架構的複雜度，並利用演算的方式控制輸入電流使其達到功因校正且在直流鏈亦能維持一穩定直流的電壓，並仍能達到國際間對電流諧波的所設立的規範。 無電流感測控制架構控制的目的為控制電感電流為弦波函數，達到輸入電流為弦波且同相，且當輸入電壓高達400Hz，依然可以達到功率因素校正的效果。

The conventional multi-loop control senses the input voltage, the output voltage and the inductor current, in order to yield in-phase sinusoidal current and regulate the output voltage. In this paper, the current sensorless control for bridgeless PFC boost rectifier is proposed where only the input voltage and the output voltage are sensed. The current sensorless control has one voltage loop, which simplies the control structure, and reduce the number of sensors. In this thesis, the input current waveform are analyzed and the circuit behavior is modeled with consideration of both the inductor resistance and the switch conduction voltage. From the simulation and experiment results, the measured sinusoidal current is in-phase with the input voltage evenwhen the line frequency is high to 400 Hz.