Patent ID: 7746042
Filing Date: 2010-06-29
Classification: H02M,Y02B

Abstract:
1. A method of converting a first DC voltage to a second DC voltage using a switched inductor voltage converter, the switched inductor voltage converter comprising a main MOSFET, a synchronous rectifier MOSFET, and an inductor, the method comprising: switching the synchronous rectifier MOSFET between a fully-on state and a low-current state, wherein the synchronous rectifier MOSFET is never turned fully off and carries a current in the range of 0.5 A to 5 A in the fully-on state and a current in the range of 1 μA to 1 mA in the low-current state; and operating the switched inductor voltage converter in a switching sequence comprising a magnetization interval wherein the main MOSFET is turned on, a first break-before-make interval wherein the main MOSFET is turned off; a recirculation interval wherein the main MOSFET is turned off and the synchronous rectifier MOSFET is switched to the fully-on state, a second break-before-make interval wherein the main MOSFET is turned off and the synchronous rectifier MOFET is switched to the low current state, and a diode recovery interval.