Abstract
A multi-mode control for Double-Clamped ZVS (DCZVS) buck-boost converter to reduce loss is presented based on the loss analysis in this paper. Firstly, the decoupling of phases and loss analysis of the DCZVS converter is discussed in detail. Then, the most efficient frequency curve with several limits is obtained. Based on this, a multi-mode control method is proposed, which is mainly composed of two timers and easy to implement. Compared with the conventional control method, the multi-mode hybrid control method in this paper avoids complex mathematical operations or inaccurate lookup-tables, and can achieve smooth mode switching. Finally, the proposed method is verified on a DCZVS prototype with the highest switching frequency of 600kHz.
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