Soft Switching Flyback Topology by Using the Energy Contained in Parasitic Elements
Conference: PCIM Europe 2014 - International Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management
05/20/2014 - 05/22/2014 at Nürnberg, Deutschland
Proceedings: PCIM Europe 2014
Pages: 8Language: englishTyp: PDFPersonal VDE Members are entitled to a 10% discount on this title
Jitaru, Ionel (Rompower Energy Systems, USA)
The paper will present a novel Soft Switching Flyback Topology which utilizes the energy contained in the parasitic resonant circuit formed by the capacitance across the primary power switch and magnetizing inductance to create soft commutation for the primary power switch. The energy contained in the parasitic resonant circuit creates ringing across the primary power switch during the dead time. This energy is typically dissipated or dampened during the dead time period. The ringing across the primary switch during the dead time period can disturb the control IC that drives the synchronous rectifier in the secondary leading to accidental turn on which impact the efficiency and the reliability of the converter. The proposed technology eliminates this ringing by "freezing" the energy contained in the parasitic resonant circuit and by using that energy to create soft switching condition for the primary switch.