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In this paper, an improved low-voltage (LV) charging circuit for a single-phase onboard battery charger (OBC) is proposed, which can operate as not only the active power decoupling circuit to filter out ripple power, but also the current doubler rectifier to charge the LV battery from high-voltage (HV) battery. When the HV battery needs to be charged from the grid the proposed module is used as the active filter. Also, when the LV battery needs to be charged from the HV battery, this circuit becomes the LV charging circuit. By that way, the DC-link capacitance in the AC-DC converter of the HV charging circuit can be reduced significantly without requiring any additional devices. In addition, some components of the proposed circuit are shared 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 simulation and experimental results have been shown to verify the effectiveness of the proposed system.
Nguyen et al. (Fri,) studied this question.