Abstract
In this paper, a grid-connected battery charger is developed. The developed battery charger is composed of a power factor corrector and a buck converter. The power factor corrector control the input current to be sinusoidal and in phase with utility voltage to perform unity power factor. The buck power converter is step-down the output power of power factor corrector to charge the battery set in constant current or constant voltage. The power factor corrector contains a rectifier, a boost converter and a switched-capacitor circuit. The switching capacitors circuit is applied to be the output of the boost converter and the input of the buck converter. Controlling the switched-capacitor circuit, the output voltage of boost converter is divided into two levels according to the utility voltage such that step-up voltage gain can be reduced when the utility voltage is small. In addition, the switched-capacitor circuit can reduce the step-down voltage ratio of the buck converter. Accordingly, the efficiency of the grid-connected battery charger is advanced. A prototype is developed and tested to verify the performance of the proposed grid-connected battery charger.
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