High‑efficiency 11 kW bi‑directional on‑board charger for Evs

Sang-Youn Lee; Woo-Seok Lee; Jun-Young Lee; Il-Oun Lee

High‑efficiency 11 kW bi‑directional on‑board charger for Evs

Vol. 22, No. 2, pp. 363-376, Feb. 2022

10.1007/s43236-021-00344-3

Rapid charger

Electric vehicle

Bi-directional power transfer

High efficiency

11 kW on-board charger

OBC

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.

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Cite this article

[IEEE Style]

S. Lee, W. Lee, J. Lee, I. Lee, "High‑efficiency 11 kW bi‑directional on‑board charger for Evs," Journal of Power Electronics, vol. 22, no. 2, pp. 363-376, 2022. DOI: 10.1007/s43236-021-00344-3.

[ACM Style]

Sang-Youn Lee, Woo-Seok Lee, Jun-Young Lee, and Il-Oun Lee. 2022. High‑efficiency 11 kW bi‑directional on‑board charger for Evs. Journal of Power Electronics, 22, 2, (2022), 363-376. DOI: 10.1007/s43236-021-00344-3.