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Vol. 177, Issue 8, August 2014, pp. 177-183




Analysis of Energy Transmission Modes of Flyback Converter

1 GONG Shu, 2 GONG Ren-Xi, 3 WANG Kuang

College of Electrical Engineering, Guangxi University, Nanning 530004, Guangxi, China
Tel.: +86-0771-3291765

E-mail: 871009450@qq.com, rxgong@gxu.edu.cn, 1678005365@qq.com


Received: 21 March 2014 /Accepted: 31 July 2014 /Published: 31 August 2014

Digital Sensors and Sensor Sysstems


Abstract: It is of significance to investigate energy transmission modes of a flyback converter for its optimum design. In this paper, the ETMs of a flyback converter are divided into three modes, which are continuous conduction mode-complete inductor supply mode, continuous conduction mode- incomplete inductor supply mode and discontinuous conduction mode-incomplete inductor supply mode, respectively. A deep analysis of the operation is made, a reduction of the boundary condition between the modes is conducted and a comparison of current stress, transformer AP and output ripple voltage between the modes is performed. A 30W prototype is developed and its experiment is done. The experiment results are in agreement with the theoretical analysis quite well.


Keywords: Energy transmission modes, Flyback converter, Continuous conduction mode-complete inductor supply mode, Continuous conduction mode-incomplete inductor supply mode, Discontinuous conduction mode-incomplete inductor supply mode.


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