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

• Main Authors: Po-Chih Chou, 周柏志
• Other Authors: Van-Tsai Liu
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/qr64t8

碩士 === 國立虎尾科技大學 === 電機工程研究所 === 98 === 　　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.