以返馳式轉換器為基礎之高功因整流器研製

Design and Implementation of The High-Power-Factor Rectifier Based on The Flyback Converter

陳建榮(Jeng-Rung Chen)

指導教授 ： 陳信助

崑山科技大學/工程學院/電機工程研究所/碩士(2004年)

https://doi.org/10.6828/KSU.2004.00025

摘要

本論文以返馳式轉換器為主動式功因校正電路的主要架構，實現理想整流器的兩大特性：高功因及穩壓的性能。
在功因方面探討兩種方法：一種是使返馳式轉換器操作在不連續導通模式，它不須額外電流控制電路，天生就具備高功因性能，另一種為感測開關電流，配合非線性載波控制法，主要應用在連續導通模式；兩者都能控制輸入線電流與輸入線電壓的波形成比例，以達到高功因的目的。
在穩壓方面是以高功整流器的LFR(Loss-Free Resistor)模式，推導出高功因整流器的小信號等效電路及其轉移函數，並使用動態信號分析儀量測波德圖，以驗證轉移函數的正確性。接著，利用頻域分析的波德圖，設計PI控制器，以達到閉迴路控制的輸出穩壓性能。
完成高功穩壓的電路分析與設計之後，研製出兩組高功返馳式整流器，以電力計量測功因確實都達到0.99以上；另外，以負載變動及輸入電壓有效值變動，驗證輸出電壓的穩壓性能，果然達到極佳的穩壓效果

關鍵字

高功因 ； 返馳式轉換器

並列摘要

In this thesis, the flyback converter is used as the active power factor corrector to achieve the characteristics of the ideal rectifier, high power factor and regulated output-voltage.
Two methods for power factor correction (PFC) are presented in the flyback rectifiers. One is the converter working in discontinuous conduction mode (DCM). Without additional current control, it inherently behaves as a natural loss-free resistor to possess the unity power factor. The other is called the nonlinear-carrier control based on sensing the switch current for continuous conduction mode (CCM). Both of them can regulate the input line current to have the same waveform as the input line voltage.
By means of the loss-free resistor (LFR) model of an ideal rectifier, the small-signal ac analysis is made and verified by using a dynamic signal analyzer. Furthermore, a PI controller is designed for the output-voltage feedback loop to accomplish the aim of output-voltage regulation.
Results of experimental verification on two sets of flyback rectifiers are presented. The input line current is a sinusoidal waveform, and the power factor is greater than 0.99 measured by a power meter. The output voltage is insensitive to the variations of load and input line voltage.

並列關鍵字

Flyback Converter ； High-Power-Factor

參考文獻

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