Integrated low‑voltage charging circuit with active power decoupling function for onboard battery chargers

Hoang Vu Nguyen; Dong-Choon Lee

Integrated low‑voltage charging circuit with active power decoupling function for onboard battery chargers

Hoang Vu Nguyen

Dong-Choon Lee

Vol. 20, No. 5, pp. 1130-1138, Sep. 2020

10.1007/s43236-020-00117-4

Capacitance minimization

Onboard battery charger

Single-phase converter

Abstract

This paper proposes a novel method to reduce the DC-link capacitor in the single-phase onboard battery chargers. A lowvoltage charging circuit is used as a two-parallel buck–boost converter to absorb ripple in the DC link. Thus, the required DC-link capacitance of the onboard battery charger can be reduced significantly without adding additional switches, heat sinks, and gated drivers. In addition, the voltage of the auxiliary capacitor can be controlled to be higher than the DC-link voltage. This allows for a further reduction of the capacitance of the auxiliary capacitor. As a result, small film capacitors can be used at the DC link instead of bulky capacitor banks or additional active power decoupling circuit. Therefore, the cost and volume of the onboard battery charger are reduced significantly. By experimental results for a 2-kW SiC-based prototype, the effectiveness of the proposed circuit has been verified.

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Cite this article

[IEEE Style]

H. V. Nguyen and D. Lee, "Integrated low‑voltage charging circuit with active power decoupling function for onboard battery chargers," Journal of Power Electronics, vol. 20, no. 5, pp. 1130-1138, 2020. DOI: 10.1007/s43236-020-00117-4.

[ACM Style]

Hoang Vu Nguyen and Dong-Choon Lee. 2020. Integrated low‑voltage charging circuit with active power decoupling function for onboard battery chargers. Journal of Power Electronics, 20, 5, (2020), 1130-1138. DOI: 10.1007/s43236-020-00117-4.