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Energies 2016, 9(3), 148; doi:10.3390/en9030148

Buck Converter with Soft-Switching Cells for PV Panel Applications

Department of Electrical Engineering, National Chin-Yi University of Technology, Taichung 41170, Taiwan
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Author to whom correspondence should be addressed.
Academic Editor: Tapas Mallick
Received: 24 November 2015 / Revised: 15 February 2016 / Accepted: 25 February 2016 / Published: 2 March 2016

Abstract

In power conversion of photovoltaic (PV) energy, a hard-switching buck converter always generates some disadvantages. For example, serious electromagnetic interference (EMI), high switching losses, and stresses on an active switch (metal-oxide-semiconductor-field-effect-transistor, MOSFET), and high reverse-recovery losses of a freewheeling diode result in low conversion efficiency. To release these disadvantages, a buck converter with soft-switching cells for PV panel applications is proposed. To create zero-voltage-switching (ZVS) features of the active switches, a simple active soft-switching cell with an inductor, a capacitor, and a MOSFET is incorporated into the proposed buck converter. Therefore, the switching losses and stresses of the active switches and EMI can be reduced significantly. To reduce reverse-recovery losses of a freewheeling diode, a simple passive soft-switching cell with a capacitor and two diodes is implemented. To verify the performance and the feasibility of the proposed buck converter with soft-switching cells for PV panel applications, a prototype soft-switching buck converter is built and implemented by using a maximum-power-point-tracking (MPPT) method. Simulated and experimental results are presented from a 100 W soft-switching buck converter for PV panel applications. View Full-Text
Keywords: hard-switching; soft-switching; electromagnetic interference (EMI); metal-oxide-semiconductor-field-effect-transistor (MOSFET); zero-voltage-switching (ZVS); maximum-power-point-tracking (MPPT) hard-switching; soft-switching; electromagnetic interference (EMI); metal-oxide-semiconductor-field-effect-transistor (MOSFET); zero-voltage-switching (ZVS); maximum-power-point-tracking (MPPT)
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Tsai, C.-T.; Chen, W.-M. Buck Converter with Soft-Switching Cells for PV Panel Applications. Energies 2016, 9, 148.

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