具功率因數修正之高效能電源供應器研製

Analysis and Implementation of a High-Performance Power Supply with PFC

周庚毅(Keng-Yi Chou)

指導教授 ： 歐勝源

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(2011年)

https://doi.org/10.6841/NTUT.2011.00085

摘要

本篇論文研製一具功率因數修正之高效能電源供應器。前級部份採用連續導通模式之升壓型功率因數修正器，後級部份則採用半橋串聯諧振式電力轉換器。此電源供應器具有架構簡單、體積較小以及功率密度高之優點，充分利用寄生元件達成零電壓切換技術(Zero-Voltage-Switching, ZVS)，有效降低開關元件切換時所造成的功率損失，進而提高電源供應器的效率。
其中諧振式轉換器之控制電路是以固定責任週期之變頻方式控制，有效利用主變壓器初級側漏電感、激磁電感、開關上的寄生元件以及諧振電容產生諧振現象，達到零電壓切換效果，並設計諧振變壓器的氣隙決定所需的激磁電感，且變壓器的漏感可用來代替諧振電感，有效的節省成本、提高電路的功率密度。
最後，本文設計並計算電路上各主要元件的數值，且實際製作一500W的電源供應器以驗證所提之分析與設計。

關鍵字

功率因數修正 ； 半橋串聯諧振式轉換器 ； 連續導通模式 ； 零電壓切換

並列摘要

This thesis focuses on the design and implementation of a high-performance power supply with power factor corrector (PFC). The front-stage is a Boost PFC operating in continuous-conduction mode (CCM) and the post-stage is a half-bridge series-resonant DC-DC converter to regulate the output voltage. The implemented topology is simple and light, and it has high power density. Moreover, the parasitic components on switches and transformer are used to act as the resonant elements for zero-voltage-switching to reduce switching loss and improve efficiency.
The implemented half-bridge series resonant converter uses constant duty cycle and variable frequency control. The leakage inductance and magnetizing inductance of the used transformer, parasitic components on switches and resonant capacitor achieve the desired zero-voltage-switching. A suitable air gap on transformer is designed for deciding the required leakage inductance to replace the resonant inductor so that cost can be reduced and power density can be increased respectively.
Finally, a 500W power supply with constant voltage output is implemented to confirm the feasibilities of the analysis and design.

並列關鍵字

Half-Bridge Series Resonant Converter ； Power Factor Corrector (PFC) ； Continuous Conduction Mode (CCM) ； Zero-Voltage-Switching

參考文獻

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