Zero Voltage Switching for Boost-Forward Converter

• Main Authors: Yu-Nine Lei, 雷育年
• Other Authors: Ching-Lung Chu
• Format: Others
• Language: zh-TW
• Online Access: http://ndltd.ncl.edu.tw/handle/33931564035496341096

碩士 === 南台科技大學 === 電機工程系 === 99 === This study proposed a zero voltage switching for a boost-forward converter. The circuit topology of the proposed converter is composed of boost converters and forward converter with cascaded connection. The proposed converter can achieve high step-up voltage gain and improve conversion efficiency. Leakage inductance and magnetizing inductance are required to charge and discharge the parasitic capacitance of the switch in order to achieve the main switch and auxiliary switch operated at the zero voltage switching. Meanwhile, the auxiliary switch can synchronize rectification and reduce conduction losses. The energy of leakage inductance and magnetizing inductance can be transferred to the input, which can reset the magnetizing inductance of the transformer. The duty cycle of the proposed converter can achieve 80%. Finally, this study developed a prototype cascaded forward DC/DC converter with an input voltage of 48V, output voltage of 400V, and output power of 100W. The experimental results verified the performance of the proposed cascaded converter.