Patent ID: 7952294

Claim:
An apparatus for power conversion, the apparatus couplable to a nonlinear load, the apparatus comprising: a first power converter stage comprising a power switch and a first inductor, the first inductor having a first inductance; a first sensor coupled to the first power converter stage and coupled to a common reference node, the first sensor adapted to sense a first parameter of the first power converter stage; a second power converter stage coupled to the first power converter stage, the second power converter stage comprising a second inductor, the second inductor having a second inductance, the second power converter stage couplable to provide an output current to the nonlinear load; a second sensor coupled to the common reference node and couplable to the nonlinear load, the second sensor adapted to sense the output current level; and a controller coupled to the power switch, the first sensor and the second sensor, the controller adapted to turn the power switch into an on state for an on-time duration substantially proportional to a ratio of the second inductance to the first inductance.