零電壓切換導通之交錯式返馳轉換器

Interleaved Flyback Converters with Zero-Voltage Switching

蘇鵬宇(Peng-Yu Su)

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(2014年)

https://doi.org/10.6343/ISU.2014.00180

摘要

本文提出零電壓切換導通之交錯式返馳轉換器，整體電路由兩組返馳轉換器組成。轉換器使用金屬氧化物半導體場效電晶體(MOSFET)作為主動開關。在無需添加任何元件之下，藉由電流流經主動開關的本質二極體，使主動開關操作於零電壓切換導通(ZVS)，提升整體轉換效率。因交錯式轉換器之特性，輸出電壓漣波較傳統返馳轉換器低，兩組返馳轉換器共同分擔總輸出功率，降低元件的電壓及電流應力，使元件壽命提升，增加電路之可靠度。
本文詳細分析整體電路之工作模式，推導電路方程式並設計電路參數，最後實際製作一200W之雛形電路，以驗證所提新型電路之可行性。由實驗結果顯示，主動開關確實操作於零電壓切換導通，能有效地減少開關損失。整體轉換效率可達到91.3%。

關鍵字

返馳轉換器 ； 交錯式轉換器 ； 零電壓切換導通

並列摘要

This thesis proposes a novel dc-to-dc converter that consists of two interleaved flyback converters with zero-voltage switching-on characteristic. Both flyback converters use power MOSFETs as the active switches. With no need to use any components for active-clamping circuit or snubber circuit, both active switches can operate at zero-voltage switching-on(ZVS) by freewheeling the converter current through the body diode of the MOSFET. The switching losses can be effectively reduced, thus improving the overall circuit efficiency. As compared with traditional flyback converter, the interleaved converter has the advantages of lower current and voltage ripples. It helps to reduce the voltage and current stresses on the circuit components, leading to increase the circuit reliability.

The steady-state analyses for different operation modes are provided and the mathematical equations for designing circuit components are conducted in this thesis. Finally, a 200-W prototype circuit was built and tested to verify the feasibility of the proposed circuit. Base in the experimental results, both active switches actually operate at ZVS. The proposed circuit is with satisfactory performance and the measured circuit efficiency is 91.3%.

並列關鍵字

Flyback converter ； Interleaved converter ； Zero-Voltage Switching-on (ZVS)

參考文獻

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