具有改善輸出電壓低頻漣波之單級高功因返馳式轉換器

Improvement of Low-FrequencyOutput Voltage Ripple of Single-StageHigh-Power-Factor Flyback Converter

李勇達(Yung-Ta Lee)

指導教授 ： 胡國英

國立臺北科技大學/電資學院/電力電子產業研發碩士專班/碩士(2013年)

摘要

本論文係研製一具有開關整併方式之單級高功因隔離式電源轉換器，結合了傳統升降壓式轉換器與返馳式轉換器。藉由適當地設計所提之電路架構中升降壓轉換器輸出電容上的跨壓，來降低開關的電壓應力與輸出電壓低頻漣波。相較於傳統的單級高功因返馳式轉換器，具有較低的輸出電壓低頻漣波。除此之外，可以藉由圈數比來改變所提之電路架構中升降壓轉換器輸出電容的電壓應力，以增加其設計彈性。於本論文中，將詳細敘述所提架構之基本操作原理、相關數學推導與理論分析，並搭配模擬與實作結果以驗證所提架構之可行性及有效性。

關鍵字

升降壓轉換器 ； 返馳式轉換器 ； 耦合電感 ； 邊界導通模式 ； 功率因數修正 ； 低頻電壓漣波 ； 電壓應力

並列摘要

In the thesis, a high-power-factor isolated power converter, combining the traditional buck-boost and flyback converters, is developed based on only one switch. Via suitable design of the voltage across the output capacitor of the buck-boost converter in the proposed circuit topology, not only the voltage stress on the switch but also the low-frequency output voltage ripple is reduced. Therefore, the proposed converter has a smaller low-frequency output voltage ripple than the traditional single-stage high-power-factor flyback converter. In addition, the voltage stress on the output capacitor of the buck-boost converter in the proposed circuit structure can be varied by the turns ratio, so as to increase design elasticity. In this study, the basic operating principles, mathematical deductions and theoretical analyses of the proposed topology are described in detail, along with some simulated and experimental results provided to verify its feasibility and effectiveness.

並列關鍵字

Buck-Boost Converter ； Flyback Converter ； Coupling Inductor ； Critical Conduction Mode ； Power Factor Correction ； Low-Frequency Voltage Ripple ； Voltage Stress

參考文獻

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