Mathematical Modelling and Simulation of Zero Voltage-Switching Synchronous Buck Converter with a Coupled Inductor
Sudhin Govind1, Athulya P Prem2, Fuhad Ahamed3, Prima Vincent4
1Sudhin Govind,  Karuna University, Coimbatore, India.
2Athulya P Prem,  Karuna University, Coimbatore, India.
3Fuhad Ahamed,  Karuna University, Coimbatore, India.
4Prima Vincent,  Karuna University, Coimbatore, India.
Manuscript received on January 25, 2014. | Revised Manuscript received on February 13, 2014. | Manuscript published on February 28, 2014. | PP: 49-52  | Volume-3, Issue-3, February 2014. | Retrieval Number:  C2544023314/2013©BEIESP

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Abstract: The paper presents mathematical modelling and simulation of a synchronous buck converter having soft-switching capability. In order to realize soft switching, based on a basic buck converter, the proposed converter added a small inductor, a diode, and an inductor coupled with the main inductor. The requirements for converters that are more compact, lighter, cost minimization and with an improved performance can be achieved by adopting a high-frequency operation. Because of soft switching, the proposed converter can obtain a high efficiency under heavy load conditions. Moreover, a high efficiency is also achieved under light load conditions, which is significantly different from other soft-switching buck converters. The detailed theoretical analyses of steady-state operation modes are presented, and the detailed modelling methods and some simulation results are also given. The switching waveforms are measured to validate the proposed topology.
Keywords: Synchronous Buck converter, zero-voltage switching (ZVS), small signal modelling and PSIM software.