This paper proposes a novel method to reduce the DC-link capacitor in the single-phase onboard battery chargers. A low-voltage 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.

中文翻译：

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用于车载电池充电器的具有有源功率解耦功能的集成低压充电电路

本文提出了一种减少单相车载电池充电器中直流母线电容器的新方法。低压充电电路用作两并联降压-升压转换器以吸收直流链路中的纹波。因此，无需添加额外的开关、散热器和门控驱动器，就可以显着降低车载电池充电器所需的直流链路电容。此外，辅助电容器的电压可以控制为高于直流母线电压。这允许进一步减小辅助电容器的电容。因此，可以在直流链路上使用小型薄膜电容器，而不是庞大的电容器组或额外的有源功率去耦电路。因此，车载电池充电器的成本和体积显着降低。