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CSEE Journal of Power and Energy Systems 2023, 9(3): 1161-1172 https://doi.org/10.17775/CSEEJPES.2021.07370
Open Access | Issue | Published: 18 August 2022

Non-isolated Step-up DC-DC Converter Based on Switched Capacitor Cells

Show Author's Information Farid Mohammadi1,  Gevork B. Gharehpetian1,  Hasan Rastegar1,  Mohammad Farhadi-Kangarlu2 ( )
Amirkabir university of technology, Tehran, Iran
Faculty of Electrical and Computer Engineering, Urmia University, Urmia, Iran
Keywords:
high voltage gain, DC-DC converter, nonisolated switched capacitor cell, voltage stress
Cite this article:
Mohammadi F, Gharehpetian GB, Rastegar H, et al. Non-isolated Step-up DC-DC Converter Based on Switched Capacitor Cells. CSEE Journal of Power and Energy Systems, 2023, 9(3): 1161-1172. https://doi.org/10.17775/CSEEJPES.2021.07370
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Abstract Full text About this article

A non-isolated high gain step-up DC-DC converter for low power applications is suggested in this study. In the designed transformerless converter, the main switch current and voltage stress is reduced while maintaining high voltage gain. For instance, with a duty cycle of 0.5 a voltage gain equal to 5 is achieved while the normalized switch voltage stress is 0.4. Also, it decreases power losses of active and passive elements. In the proposed converter design, the switched-capacitor (SC) technique is used to obtain maximum voltage transfer gain using only one switch. The three modes of operation, i.e., continuous conduction mode (CCM), boundary conduction mode (BCM), and discontinuous conduction mode (DCM), are studied in detail. The small signal analysis (SSA) of the designed converter is investigated, and its steady-state model is examined under CCM. Performance of the proposed converter proposed in this study is assessed and tested using a prototype. Efficiency of the converter is recorded above 94% in a wide range of output powers. Overall, compared to the other converters, the results suggest satisfactory performance of the designed converter. An issue of the proposed converter is that its input current is not smooth due to using the switched-capacitor cell in its structure. This issue is alleviated by using input filters.


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About this article

Non-isolated Step-up DC-DC Converter Based on Switched Capacitor Cells

Show Author's information Farid Mohammadi1, Gevork B. Gharehpetian1, Hasan Rastegar1, Mohammad Farhadi-Kangarlu2 ( )
Amirkabir university of technology, Tehran, Iran
Faculty of Electrical and Computer Engineering, Urmia University, Urmia, Iran

Abstract

A non-isolated high gain step-up DC-DC converter for low power applications is suggested in this study. In the designed transformerless converter, the main switch current and voltage stress is reduced while maintaining high voltage gain. For instance, with a duty cycle of 0.5 a voltage gain equal to 5 is achieved while the normalized switch voltage stress is 0.4. Also, it decreases power losses of active and passive elements. In the proposed converter design, the switched-capacitor (SC) technique is used to obtain maximum voltage transfer gain using only one switch. The three modes of operation, i.e., continuous conduction mode (CCM), boundary conduction mode (BCM), and discontinuous conduction mode (DCM), are studied in detail. The small signal analysis (SSA) of the designed converter is investigated, and its steady-state model is examined under CCM. Performance of the proposed converter proposed in this study is assessed and tested using a prototype. Efficiency of the converter is recorded above 94% in a wide range of output powers. Overall, compared to the other converters, the results suggest satisfactory performance of the designed converter. An issue of the proposed converter is that its input current is not smooth due to using the switched-capacitor cell in its structure. This issue is alleviated by using input filters.

Keywords: high voltage gain, DC-DC converter, nonisolated switched capacitor cell, voltage stress

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Publication history

Received: 16 December 2021
Revised: 25 April 2022
Accepted: 07 June 2022
Published: 18 August 2022
Issue date: May 2023

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© 2021 CSEE.

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This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

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