High-boost DC-DC converter using a three-winding coupled inductor

Abstract

A high-boost DC-DC converter using a three-winding coupled inductor includes a boost converter circuit and an output circuit. The boost converter circuit receives a DC input voltage and includes an input inductor, a main switch, a boost capacitor, a coupled inductor having first, second, and third windings, a clamping diode, and a clamping capacitor. A first terminal of the first winding is electrically connected to the cathode of the clamping diode; a second terminal of the first winding is electrically connected to a first terminal of the second winding and to a second terminal of the boost capacitor; and a second terminal of the second winding is electrically connected to the output circuit via the third winding. Through this design, the present invention achieves high voltage gain with two design degrees of freedom: the coupled inductor turns ratio and the switch conduction ratio, thus avoiding the need for operation at extremely high conduction ratios.

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