Mobile QR Code QR CODE : The Korean Institute of Power Electronics
Title Soft Switching Control Method for Photovoltaic AC Module Flyback Inverter using Synchronous Rectifier
Authors Jin-Woo Jang ; Young-Ho Kim ; Bong-Yeon Choi ; Yong-Chae Jung ; Chung-Yuen Won
DOI 10.6113/TKPE/2013.18.4.312
Page pp.312-321
ISSN 1229-2214
Keywords voltage spike; synchronous rectifier(SR); soft switching; active clamp circuit; zero voltage switching(ZVS); photovoltaic(PV)
Abstract In this paper, high efficiency control method for flyback inverter with synchronous rectifier(SR) based on photovoltaic AC modules is proposed. In this control method, the operation of SR is classified according to the voltage spike across main switch SP. When the voltage spike across SP is lower than the rating voltage of SP, the operation of active clamp circuit is interrupted for reducing the switching loss of auxiliary switch. In this time, the SR is operated for soft-switching of SP. When the voltage spike across Sp is higher than the rating voltage of SP, the operation of active circuit is activated for reducing the voltage spike. The SR is operated for reducing the conduction loss of secondary output diode. Thus, a switching loss of the main switch can be reduced in low power region, and weighted-efficiency can be improved. A theoretical analysis and the design principle of the proposed method are provided. And validity is confirmed through simulation and experimental results.