Abstract: A hybrid bidirectional DC to DC converter allows a direct boost ratio in the high voltage to low voltage direction, but not in the low to high direction. Switches are used to tie the commons of the transformers to ground and power rail to allow the formation of a full-bridge with remaining phases to alter the boost ratio so that transformers do not need to be connected in series in the high voltage to low voltage direction. The switches are on a connection shared by the transformers and are configured to allow a dynamic changeover of the secondary windings in a multi-phase delta-wye configuration from a series nature into a parallel nature such that a 2× boost of winding ratio is reduced to a 1× boost of winding ratio depending on whether the input voltage is above or below a threshold input voltage.

Abstract: A hybrid bidirectional DC to DC converter allows a direct boost ratio in the high voltage to low voltage direction, but not in the low to high direction. Switches are used to tie the commons of the transformers to ground and power rail to allow the formation of a full-bridge with remaining phases to alter the boost ratio so that transformers do not need to be connected in series in the high voltage to low voltage direction. The switches are on a connection shared by the transformers and are configured to allow a dynamic changeover of the secondary windings in a multi-phase delta-wye configuration from a series nature into a parallel nature such that a 2× boost of winding ratio is reduced to a 1× boost of winding ratio depending on whether the input voltage is above or below a threshold input voltage.