具同步整流倍流輸出之單級非對稱半橋電能轉換器

Single-Stage Asymmetrical Half-Bridge Power Converter with Synchronous Current-Doubler Rectification

蘇英傑(Ying-Chieh Su)

指導教授 ： 邱煌仁

中原大學/工學院/電機工程研究所/碩士(2004年)

https://doi.org/10.6840/cycu200400103

摘要

本論文主要為研製一種具同步整流倍流輸出的單級非對稱半橋轉換器，利用非對稱半橋轉換器自身的柔性切換、較少的元件數、較低的變壓器匝比、功率開關箝制在輸入電壓等優點來做為直/直流轉換單元，在加入一升壓型轉換器來做為功因校正單元其操作在不連續導通模式，天生具有功因校正能力，不須在另加控制器等優點，次級側則利用同步整流倍流來替代蕭基二極體改善低壓高電流輸出應用時的轉換效率，在對單級電能轉換器動作原理做詳細分析與討論，並以IsSpice軟體進行模擬分析，最後以設計實例完成一個輸入電壓110V（變動範圍90~130V）輸出為5V/20A、最高效率為81.87％的單級高功因電能轉換器，並實際量測以驗証電腦模擬與理論分析的估測。

關鍵字

非對稱半橋轉換器 ； 功率因數 ； 同步整流倍流

並列摘要

This thesis presents the design and implementation of the single-stage high power factor asymmetrical half-bridge converter with synchronous current-doubler rectification. The asymmetrical half-bridge converter has many advantages such as soft switching properties, fewer components, lower voltage across the transformer primary allows a smaller number of primary turns and voltage across the switches is clamped to the input voltage ,and therefore it is suitable for the DC/DC cell. Then boost-type converter use in a PFC cell that operating in discontinus conduction mode has innate of power factor collection without any controller. We employ a synchronous current-doubler-rectification in the secondary winding of the single-stage AC/DC converter to improve efficiency of the converter when operating in low-voltage/high-current conditions. The operation principle and equivalent circuits of the single-stage AC/DC converter in every operating stage have be described and analyzed in detail. Computer simulation using IsSpice has been applied in design and analyzing the single-stage AC/DC converter. Experiment results have verified the theoretical analysis and computer simulation with an input of 110 V (ranged from 90~130V), output of 5V/20A, and maximum efficiency of 81.87 %.

並列關鍵字

asymmetrical half-bridge converter ； Power Factor ； synchronous current-doubler rectification

參考文獻

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June 1989