零電壓切換之高導通週期升壓－順向式直流／直流轉換器

Zero-Voltage-Switching for High Duty Cycle Boost-Forward DC/DC Converter

朱慶隆(Ching-Lung Chu) ； 雷育年(Yu-Nine Lei)

《技術學刊》 29卷4期 (2014/12) Pp. 289-299

摘要

本文提出一零電壓切換（zero-voltage-switching, ZVS）之高導通週期升壓－順向式直流／直流轉換器。電路架構是結合順向式轉換器和升壓型轉換器之輸出電壓做疊接方式，藉此提高轉換器之升壓比與電源轉換效率，利用漏電感和磁化電感對切換開關寄生電容之充放電，使得主開關和輔助開關都能達到零電壓切換，且輔助開關具有同步整流功能可降低導通損失。並將變壓器之磁化電感電流回送至正電端，藉此使變壓器之磁化電感可重置，則此升壓－順向式轉換器之導通週期可至80%，以提高升壓比。最後，將實作一組輸入電壓48 V，輸出電壓400 V，輸出功率100 W之電路雛型，並由實驗結果驗證所提轉換器電路架構之可行性與性能。

關鍵字

零電壓切換 ； 疊接架構 ； 升壓／順向式轉換器

並列摘要

This study proposed zero-voltage-switching (ZVS) for a high duty cycle boost-forward DC/DC converter. The circuit topology of the proposed converter is composed of boost converters and a forward converter with cascaded output connection. The proposed converter can achieve high step-up voltage gain and improve conversion efficiency. In order to achieve the main switch and auxiliary switch operating at zero voltage switching, leakage inductance and magnetizing inductance are used to charge and discharge the parasitic capacitance of the switch. Meanwhile, the auxiliary switch can synchronize rectification and reduce conduction losses. The current of the magnetizing inductance of the forward transformer can be transferred to the input, thus the magnetizing inductance of the transformer can be reset. The duty cycle of the proposed boost-forward converter can achieve 80% high step-up voltage gain. Finally, a prototype of a high duty cycle boost-forward DC/DC converter with an input voltage of 48 V, output voltage of 400 V, and output power of 100 W was developed. The experimental results verify the feasibility and performance of the proposed high duty cycle boost-forward DC/DC converter.

並列關鍵字

ZVS ； cascaded output ； boost-forward converter