Patent ID: 7554820

Claim:
A series resonant DC-DC converter, comprising: a switching stage operable to control a switch to turn on and off according to a predetermined switching cycle, where the switching cycle comprises a first interval that turns on the switch and a second interval that turns off the switch prior to a next switching cycle of another switch; a series resonant stage coupled to the switching stage and comprising a capacitor and an inductor connected in series, where the inductor comprises a first inductor and a second inductor that are magnetically coupled to each other; a transformer stage comprising a primary winding and a secondary winding, the primary winding connected in series with the series resonant stage; a clamping stage coupled to the inductor and placed between the series resonant stage and the transformer stage, the clamping stage operable to clamp an excess voltage, where the excess voltage is a predetermined voltage drop produced by the second inductor; and, an output stage coupled to the secondary winding of the transformer stage and configured to power a load.