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Open AccessArticle

Modular Battery Charger for Light Electric Vehicles

1
Department of Electrical Power Engineering and Mechatronics, Tallinn University of Technology, 19086 Tallinn, Estonia
2
Department of Industrial Electronics, National Technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute”, 03056 Kyiv, Ukraine
3
Faculty of Power and Electrical Engineering, Riga Technical University, LV1048 Riga, Latvia
*
Author to whom correspondence should be addressed.
Energies 2020, 13(4), 774; https://doi.org/10.3390/en13040774
Received: 30 December 2019 / Revised: 7 February 2020 / Accepted: 8 February 2020 / Published: 11 February 2020
(This article belongs to the Special Issue Emerging DC/AC Converters for Storage and Renewable Application)
Rapid developments in energy storage and conversion technologies have led to the proliferation of low- and medium-power electric vehicles. Their regular operation typically requires an on-board battery charger that features small dimensions, high efficiency and power quality. This paper analyses an interleaved step-down single-ended primary-inductor converter (SEPIC) operating in the discontinuous conduction mode (DCM) for charging of battery-powered light electric vehicles such as an electric wheelchair. The required characteristics are achieved thanks to favourable arrangement of the inductors in the circuit: the input inductor is used for power factor correction (PFC) without additional elements, while the other inductor is used to provide galvanic isolation and required voltage conversion ratio. A modular interleaved structure of the converter helps to implement low-profile converter design with standard components, distribute the power losses and improve the performance. An optimal number of converter cells was estimated. The converter uses a simple control algorithm for constant current and constant voltage charging modes. To reduce the energy losses, synchronous rectification along with a common regenerative snubber circuit was implemented. The proposed charger concept was verified with a developed 230 VAC to 29.4 VDC experimental prototype that has proved its effectiveness. View Full-Text
Keywords: AC-DC power converters; power factor correction; single-ended primary-inductor converter (SEPIC); interleaved control; lithium-ion batteries battery chargers; land vehicles AC-DC power converters; power factor correction; single-ended primary-inductor converter (SEPIC); interleaved control; lithium-ion batteries battery chargers; land vehicles
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MDPI and ACS Style

Blinov, A.; Verbytskyi, I.; Zinchenko, D.; Vinnikov, D.; Galkin, I. Modular Battery Charger for Light Electric Vehicles. Energies 2020, 13, 774.

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