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http://dx.doi.org/10.6113/JPE.2019.19.2.394

Reduction of DC-Link Capacitance in Single-Phase Non-Isolated Onboard Battery Chargers  

Nguyen, Hoang Vu (Department of Electrical Engineering, Yeungnam University)
Lee, Sangmin (Doosan Robotics Inc.)
Lee, Dong-Choon (Department of Electrical Engineering, Yeungnam University)
Publication Information
Journal of Power Electronics / v.19, no.2, 2019 , pp. 394-402 More about this Journal
Abstract
This paper proposes a single-phase non-isolated onboard battery charger (OBC) for electric vehicles (EVs) that only uses small film capacitors at the DC-link of the AC-DC converter. In the proposed charger, an isolated DC-DC converter for low-voltage batteries is used as an active power decoupling (APD) circuit to absorb the ripple power when a high-voltage (HV) battery is charged. As a result, the DC-link capacitance in the AC-DC converter of the HV charging circuit can be significantly reduced without requiring any additional devices. In addition, some of the components of the proposed circuit are shared in common for the different operating modes among the AC-DC converter, LV charging circuit and active power filter. Therefore, the cost and volume of the onboard battery charger can be reduced. The effectiveness of the proposed topology has been verified by the simulation and experimental results.
Keywords
Active filters; Plug-in electric vehicles; Single-phase chargers; Single-stage;
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