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http://dx.doi.org/10.1007/s43236-021-00344-3

High-efficiency 11 kW bi-directional on-board charger for EVs  

Lee, Sang-Youn (Department of Electrical Engineering, Myongji University)
Lee, Woo-Seok (Department of Electrical Engineering, Myongji University)
Lee, Jun-Young (Department of Electrical Engineering, Myongji University)
Lee, Il-Oun (Department of Electrical Engineering, Myongji University)
Publication Information
Journal of Power Electronics / v.22, no.2, 2022 , pp. 363-376 More about this Journal
Abstract
This paper presents an 11 kW bi-directional on-board charger (OBC) for electric vehicles with 96% efficiency. The OBC consists of a three-phase two-level AC/DC converter and a CLLLC resonant DC/DC converter with bi-directional power transfer. In order to achieve high efficiency, all the devices in the OBC are implemented using SiC-MOSFETs while the DC-link voltage is designed to track the battery voltage level in both the forward and reverse power modes. The AC/DC converter adopts a DC-link voltage controller that can adapt its control gain according to the status of the DC-link voltage. By adjusting the DC-link voltage level according to the battery voltage, the CLLLC resonant converter always runs at a switching frequency near its resonant frequency. This ensures high-efficiency operation in both the forward and reverse power modes while achieving a full voltage gain. The feasibility of the proposed 11 kW OBC is demonstrated experimentally by constructing a prototype converter with a 3-phase 60 Hz 380 VAC input, an 11 kW capacity, and a battery voltage range of 214-413 VDC. The prototype OBC achieves a conversion efficiency of over 96% in both the forward and reverse power modes resulting in a power density of over 1.0 kW/liter.
Keywords
Rapid charger; Electric vehicle; Bi-directional power transfer; High efficiency; 11 kW on-board charger; OBC;
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