Converter system and control method thereof

Abstract

A converter system and a control method thereof is provided, the converter system includes an AC source, a DC output, a switching circuit, a boost inductor, a grid inductor, a ZVS inductor, a ZVS capacitor, and a controller. The switching circuit includes a first to fourth switches. The first switch and the third switch are electrically connected in series, and there is a first node between the first switch and the third switch. The second switch and the fourth switch are electrically connected in series, and there is a second node between the second switch and the fourth switch. The ZVS inductor and the ZVS capacitor are electrically connected in series between the first node and the second node to form a ZVS branch. The controller controls the converter system to transit between a unipolar switching mode and a phase-shift switching mode according to a duty cycle of the switching circuit.

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