具前級功因調整器之半橋LLC諧振式電源轉換器研製

ANALYSIS AND IMPLEMENTATION OF A HALF-BRIDGE LLC RESONANT CONVERTER WITH FRONT-END POWER FACTOR CORRECTION

黃偉銓(Wei-Chiuan Huang)

指導教授 ： 李清元

大同大學/電機資訊學院/電機工程學系所/碩士(2009年)

摘要

本文將設計及製作一個半橋LLC諧振式電源轉換器以提供大尺寸的液晶電源使用。在本文中以主動式昇壓式功因修正電路將工作於連續電流模式，使其能達到高功因，並且有效降低輸入電流諧波之要求。其後級之半橋LLC諧振式轉換器藉由推導電路阻抗、諧振電感比例值與品質因數得到轉移函數，以及利用適當的諧振電路的設計與切換頻率的調變的方式達到輸出電壓穩定，並且令功率開關具有零電壓切換之功用，以降低功率開關的切換損失。
文中將會探討LLC串聯諧振式轉換器的工作模式、交流與直流特性分析作為諧振電路的設計與元件選用。最後實際製作一具有高功因的LLC諧振式電源轉換器，其轉換器輸入電壓為交流110V到230V，輸出直流容量為66V/7.27A，輸出瓦數為480W，並經由實驗結果來驗證其理論。

關鍵字

LLC諧振式轉換器 ； 功因修正

並列摘要

This thesis presents a half-bridge LLC resonant converter for large scale LCD TV power supply. The circuit configuration consists of a boost converter for power factor correction and a half-bridge LLC resonant converter. The PFC circuit operates in continuous current mode to achieve a high power factor and reduces the input current harmonic. The transfer function of the LLC resonant converter can be obtained by using the circuit impedance, ratio of resonant inductance, and quality factor. With proper selection of the resonant tank and modulation of the operation switching frequency, the proposed circuit can achieve zero voltage switching (ZVS), stabilize the output voltage, and then reduce the switching loss.
In addition, the operation modes and dc characteristics are discussed for designing the resonant tank. A prototype of a 480W-LLC resonant converter having a high power factor with AC input 110V~230V and DC output 66V/7.27A is constructed. Experimental results of the ZVS prove that the proposed circuit can achieve the requirements.

並列關鍵字

LLC resonant converter ； power factor correction

參考文獻

[1]B. Yang, “Topology Investigation for front end Dc/Dc Power Conversion for Distributed Power System” Dissertation submitted to the Faculty of the Virginia Polytechnic Institute and State University in partial fulfillment of the requirements for the degree of Doctor of Philosophy in Electrical Engineering, 2003.

[2]R. L. Steigerwald, “A Comparison Half-Bridge Resonant Converter Topologies” IEEE Trans. Power Electronics, pp.174-182, 1988.

[3]S. Korotkov, V. Meleshin, Al nemchinov, and S. Fraidlin, “Soft-Switched Asymmetrical Half-Bridge DC/DC Converter: Steady-State Analysis. An Analysis of Switching Process,” IEEE INTELEC, pp. 177-184, 1997.

[4] Bor-Ren Lin, Huann-Kengm, and Kao-Cheng Chen, “Analysis and Implementation of an asymmetrical half-bridge converter,” IEEE PEDS, pp. 407-412, 2006.

[5] Guan-Chyun Hsieh, and Chi-Yeh Kuo, “Modeling and Design for ZVS Asymmetrical Half-Bridge Converter,” IEEE TENCON, pp. 1-6, 2005.