Equivalent Two Switches and Single Switch Buck/Buck-Boost Circuits for Solar Energy Harvesting Systems

• Published in: Energies (Basel) Vol. 13; no. 3; p. 583
• Main Authors: Jamshidpour, Ehsan, Jovanovic, Slavisa, Poure, Philippe
• Format: Journal Article
• Language: English
• Published: Basel MDPI AG 2020; MDPI
• Subjects: Alternative energy sources; Batteries; Buck converters; buck/buck-boost circuit; Circuits; Comparative analysis; Conversion; Cost control; Electric potential; Electronics; Energy harvesting; energy harvesting system; Engineering Sciences; Equivalent circuits; equivalent single switch circuit; Maximum power; Photovoltaics; Solar energy; solar pv; Stability; switch number reduction; synchronous switch; Transistors; two-stage dc-dc electronic conversion; Voltage; buck/buck-boost circuit; solar PV; energy harvesting system; switch number reduction; synchronous switch; equivalent single switch circuit; two-stage DC-DC electronic conversion
• ISSN: 1996-1073; 1996-1073
• DOI: 10.3390/en13030583

In this paper, a comparative analysis has been presented of two equivalent circuits of non-isolated buck/buck-boost converters under synchronous control, used in a stand-alone Photovoltaic-battery-load system. The first circuit consists of two cascaded buck and buck-boost classical converters with two controllable switches. The buck converter is used to extract the maximum power of the Photovoltaic source, and the buck-boost converter is applied for the output voltage level control. The second circuit consists of a proposed converter with a single controllable switch. In both cases, the switching frequency is used to track the maximum power point and the duty ratio controls the output voltage level. Selected simulation results and experimental tests confirm that the two conversion circuits have identical behavior under synchronous control. This study shows that the single switch converter has a lower size and cost, but it is limited in the possible control strategy.