具高電壓增益之直流對直流昇壓-順向-反馳轉換器之改善設計

Improved Design of DC/DC Boost-Forward-Flyback Converter with High Voltage Gain

張立杰(Li-Jie Zhang)

指導教授 ： 劉煥彩

國立虎尾科技大學/電機資訊學院/電機工程研究所/碩士(2014年)

https://doi.org/10.6827/NFU.2014.00173

摘要

本論文提出了一種新穎的直流對直流轉換器，其電路不需要很高的佔空比就能達到高電壓增益之目的。所提出之轉換器操作簡易，僅需一組脈波寬度調變(Pule Width Modulation , PWM)。本論文是以昇壓-順向-反馳(Boost-Forward-Flyback;BFF)高電壓增益轉換器之設計。其電路架構整合了昇壓(Boost)、順向(Forward)、反馳(Flyback)之電路特性。此外本電路之昇壓(Boost)架構是使用二次式昇壓轉換器所組成，由輸入電感做第一次升壓，再由耦合電感做第二次升壓。然而耦合電感之漏感能量是可以被回收的，因此可以降低主動開關上之電壓應力以及能量損失。另外，亦可藉由調整耦合電感上的匝數比得到更高的電壓增益。其電路之操作原理、理論分析、實驗波型以及效率波型圖將會在此論文中實現。
最後，實作電路以輸入電壓44~54 V、輸出電壓380 V、滿載功率1500 W之原型電路，並應用在輕型電動車上，驗證其效能及可行性。

關鍵字

高電壓增益 ； 耦合電感 ； 箝位電路

並列摘要

This paper proposed a novel dc-dc converter to achieve high step-up voltage gain without an extremely high duty ratio. This thesis is a design of　Boost-Forward-Flyback (BFF) converter　with high voltage gain. The circuit structure is integrated by Boost,　Forward and　Flyback. The proposed converter controlled by only a single pulse width modulation (PWM) for the power switch. The figuration of the proposed converter is a quadratic boost converter with the coupled inductor in the second boost converter. The leakage inductance energy of the coupled inductor can be recycled to reduce the voltage stress and power losses. To deserve, the coupled-inductor can be adjusted by increasing the turn ratios of the secondary-side winding to achieve higher voltage gain feature. The operating principles, theoretical analysis, experimental waveforms and efficiency curves are presented.
Finally, a prototype to verify the performance of the proposed converter with input voltage 44~54 V, output voltage 380 V and output power 1.5k W is implemented.

並列關鍵字

High voltage gain ； Coupled-inductor ； Clamp Circuit

參考文獻

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