Power conversion device and pre-charging method thereof

Abstract

The invention provides a power conversion device and a pre-charging method thereof. The power conversion device includes a power converter, a sensing circuit and a pre-charging circuit. The power converter includes a flying capacitor. The sensing circuit senses the terminal voltage difference of the flying capacitor to generate a sensing result. The pre-charging circuit pre-charges the flying capacitor during a power-on transient period of the power conversion device. The pre-charging circuit stops pre-charging for the flying capacitor based on the sensing result. The power converter converts a first DC voltage into a second DC voltage for a load circuit during a normal operation period after the power-on transient period.

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