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Energies 2017, 10(5), 719; doi:10.3390/en10050719

A Multistage DC-DC Step-Up Self-Balanced and Magnetic Component-Free Converter for Photovoltaic Applications: Hardware Implementation

1
Department of Electrical and Electronics Engineering, University of Johannesburg, PO Box 524, Auckland Park, Johannesburg 2006, South Africa
2
Centre for Reliable Power Electronics (CORPE), Department of Energy Technology, Aalborg University, 9000 Aalborg, Denmark
*
Author to whom correspondence should be addressed.
Academic Editor: Tapas Mallick
Received: 24 December 2016 / Revised: 15 May 2017 / Accepted: 15 May 2017 / Published: 18 May 2017

Abstract

This article presents a self-balanced multistage DC-DC step-up converter for photovoltaic applications. The proposed converter topology is designed for unidirectional power transfer and provides a doable solution for photovoltaic applications where voltage is required to be stepped up without magnetic components (transformer-less and inductor-less). The output voltage obtained from renewable sources will be low and must be stepped up by using a DC-DC converter for photovoltaic applications. 2 K diodes and 2 K capacitors along with two semiconductor control switch are used in the K-stage proposed converter to obtain an output voltage which is (K + 1) times the input voltage. The conspicuous features of proposed topology are: (i) magnetic component free (transformer-less and inductor-less); (ii) continuous input current; (iii) low voltage rating semiconductor devices and capacitors; (iv) modularity; (v) easy to add a higher number of levels to increase voltage gain; (vi) only two control switches with alternating operation and simple control. The proposed converter is compared with recently described existing transformer-less and inductor-less power converters in term of voltage gain, number of devices and cost. The application of the proposed circuit is discussed in detail. The proposed converter has been designed with a rated power of 60 W, input voltage is 24 V, output voltage is 100 V and switching frequency is 100 kHz. The performance of the converter is verified through experimental and simulation results. View Full-Text
Keywords: DC-DC converter; self-biased; magnetic component free; multistage; step-up; photovoltaic application DC-DC converter; self-biased; magnetic component free; multistage; step-up; photovoltaic application
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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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Bhaskar, M.S.; Padmanaban, S.; Blaabjerg, F. A Multistage DC-DC Step-Up Self-Balanced and Magnetic Component-Free Converter for Photovoltaic Applications: Hardware Implementation. Energies 2017, 10, 719.

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