Patent ID: 8804376
Filing Date: 2014-08-12
Classification: H02M

Abstract:
1. A DC/DC converter with selectable coupling ratio, characterized in that the DC/DC converter comprises: a full bridge circuit having four power transistors to form two input terminals and two output terminals, wherein the two input terminals are adapted to connect to a source DC voltage; a transformer comprising a rectifying unit formed by P diodes, wherein P=2M+2, every two of the diodes are connected in series at a node to form a branch, and all the branches are connected in parallel; the first end and the second end of the stationary winding connected to the two nodes of two of the branches respectively; the first ends of the multiple selectable windings connected, through multiple switches respectively, to the nodes of other branches that are not connected to the stationary winding; wherein one of the multiple switches of the selectable windings is selected based on a magnitude of the source DC voltage and turned on so that a coupling ratio of the transformer is changed to produce a DC voltage with a required voltage level at the secondary side of the transformer.