應用對偶返馳式電路之高功因交直流轉換器

A High-Power-Factor AC/DC Converter with Dual Flyback Conversion Circuits

謝時淵(Shi-Yuan Hsieh)

指導教授 ： 鄭宏良

義守大學/電機資訊學院/電機工程學系/碩士(2016年)

摘要

本文提出結合兩組返馳式轉換電路組成的高功因交流-直流轉換器。交錯式轉換器使用兩個功率場效電晶體作為主動開關。藉由電流流經轉換器之主動開關的本質二極體，無需增加輔助電路，使主動開關操作於零電壓切換導通(ZVS)，提升整體轉換效率。因交錯式之特性，輸出電壓漣波較傳統返馳式轉換器低，降低元件的電壓及電流應力，增加電路之可靠度。
本文詳細分析電路工作模式分析，並設計製作 200-W 轉換器之雛形電路。由實驗結果顯示，藉由主動開關操作於零電壓切換導通能有效地減少開關損失。整體電路具高功因之特性且電路轉換效率為93.25%。

關鍵字

返馳轉換器 ； 發光二極體 ； 交錯式轉換器 ； 零電壓切換導通

並列摘要

This thesis proposes a high power-factor AC-DC converter with two flyback conversion circuits. The interleaved flyback converters adopt two power MOSFETs as the active switches. With no need to use any auxiliary components and snubber circuit, both active switches can operate at zero-voltage switching on (ZVS) by freewheeling the inductor current through the body diode of the MOSFET. Operating active switches at ZVS can effectively decrease the switching losses, and hence improve the circuit efficiency. As comparing the proposed interleaved circuit with traditional one, the former is with the advantage of lower current and voltage ripples. It helps to decrease the current and voltage stresses on the circuit components. Besides, the circuit reliability can be improved.
The detail circuit operation and analysis are provided. A prototype circuit of a 200-W converter was built and tested. The experimental results show that the switching losses can be effectively reduced by operating the active switches at ZVS. The proposed circuit can achieve nearly unity power factor and the measured circuit efficiency is 93.25%.

並列關鍵字

Flyback converter ； light-emitting diode (LED) ； interleaved converter ； Zero-Voltage Switching-on (ZVS)

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