Patent ID: 7796405

Claim:
A device comprising: a full bridge having a first terminal, a second terminal, a third terminal, and a fourth terminal, and first and second pairs of transistors, the first pair of transistors being activated and deactivated when a load applied to the device is above a predetermined level and continuously deactivated when the load applied to the device is below the predetermined level, the second pair of transistors being activated and deactivated when the load applied to the device is both above and below the predetermined level; a half bridge having a first terminal connected to the first terminal of the full bridge, a second terminal connected to the second terminal of the full bridge, a third terminal coupled to the third terminal of the full bridge, and a third pair of transistors activated and deactivated when the load applied to the device is below the predetermined level and continuously deactivated when the load applied to the device is above the predetermined level; a first inductor having a first terminal connected to the third terminal of the full bridge, and a second terminal coupled to the fourth terminal of the full bridge, the first inductor adapted to provide a zero voltage switching of the device at a heavy load; and a second inductor having a first terminal connected to the third terminal of the half bridge, and a second terminal coupled to the first terminal of the first inductor, the second inductor adapted to cooperate with the first inductor to provide the zero voltage switching of the device at a light load; wherein the first and third pairs of transistors are activated at different times.