Patent ID: 8018745

Claim:
A system for protecting a power converter, the system comprising: a current generator configured to generate a first current flowing into the current generator, the first current being associated with a current magnitude; a comparator configured to receive a threshold signal and a first signal and to generate a comparison signal, the first signal being a sum of a second signal and a third signal, the second signal being associated with the first current, the third signal being associated with an input current for the power converter; a pulse-width-modulation generator configured to receive at least the comparison signal and generate a modulation signal based on at least information associated with the comparison signal; and a switch configured to receive the modulation signal and adjust the input current for the power converter; wherein: the current magnitude is a first function of time corresponding to a first slope during a first substantial period of time; the current magnitude is a second function of time corresponding to a second slope during a second substantial period of time; the current magnitude is a third function of time corresponding to a third slope during a third substantial period of time; the first substantial period of time and the third substantial period of time are separated by at least the second substantial period of time; the second slope is different from the first slope; the second slope is different from the third slope; and at least one of the first slope and the third slope is equal to zero.