Tung & Associates
Charger circuit and power conversion circuit thereof
A charger circuit for providing a charging power to a battery includes a power delivery unit and a power conversion circuit. The power conversion circuit includes at least one conversion switch coupled to an inductor, a front stage switch conducting a DC power generated by the power delivery unit to generate a mid-stage power, and a direct charging switch. In a switching charging mode, the conversion switch converts the mid-stage power to the charging current onto a charging node. In a direct charging mode, the power delivery unit regulates the DC current, and the front stage switch and the direct charging switch conduct the DC current onto the charging node. The body diodes of the front stage switch and the direct charging switch are reversely coupled, and the body diodes of the front stage switch and the conversion switch are reversely coupled, for blocking the parasitic body current.
RICHTEK TECHNOLOGY CORPORATION
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Chun-Jen Tsung-Wei Yu-Huei Ruei-Hong
Shih Huang Lee Peng