昇壓-順向-返馳式高電壓增益轉換器之設計

Design of Boost-Forward-Flyback Converter with High Voltage Gain

周柏志(Po-Chih Chou)

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(2010年)

摘要

目前高電壓增益之高效率轉換器需求日趨漸增，對於光伏(photovoltaic ; PV)系統、燃料電池(fuel cell)、風力發電機與不斷電系統(uninterruptible power systems ; UPS)等低電壓輸出設備而言，將其昇壓至高電壓並具高效率之大功率輸出是為一技術重點。本文係為一昇壓-順向-返馳(Boost-Forward-Flyback ; BFF)高電壓增益轉換器之設計。此電路架構整合了昇壓(Boost)轉換器、順向(Forward)轉換器與返馳(Flyback)轉換器之電路特性，僅需一組脈寬調變(pulse width modulation ; PWM)訊號輸出控制，故電路設計簡易；並具有能量回送機制，可將功率元件截止時產生之突波，經昇壓電路送至輸出端，達到主動式箝位(active clamp)與降低功率元件電壓應力特性，可提升電路整體效率。經實驗證實，此昇壓-順向-返馳轉換器具有高電壓增益、高轉換效率、低電壓應力等特性，適用於低壓輸入高壓輸出之大功率產品。最後以微控制器搭配昇壓-順向-返馳高電壓增益轉換器，針對燃料電池設計出合適之高電壓增益轉換器，並與鋰電池作為供電來源，應用於混合式電動車輛上。

關鍵字

昇壓-順向-返馳轉換器 ； 高電壓增益 ； 主動式箝位 ； 微控制器 ； 混合式電動車輛

並列摘要

High voltage gain and high-efficiency converter is an increasing demand at present. These voltages are low for photovoltaic (PV) systems, fuel cells, wind generators and uninterruptible power systems (UPS). Therefore, design of converter becomes a challenge to step-up voltage with high efficiency and high power output. 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. Design is simple that circuit needs a pulse width modulation (PWM) signal output only. In addition, at cut-off time, the MOSFET generates spike by way of circuit sent to the output. This way achieve energy recovery, active clamp, and can reduce the voltage stress of power devices to improve circuit efficiency. The experimental results have confirmed that the BFF converter possesses high voltage gain, high efficiency and low voltage stress. This converter can be used in low voltage input and high voltage out-put products. Finally, a suitable high-voltage gain converter is designed for fuel cell with micro-controller unit (MCU), besides to apply in hybrid electric vehicle with li-ion battery.

並列關鍵字

Boost-Forward-Flyback converter ； high voltage gain ； active clamp ； micro-controller unit ； hybrid electric vehicle

參考文獻

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