Patent ID: 8482946

Claim:
A system for protecting a power converter, the system comprising: a voltage generator configured to generate a first voltage signal, the first voltage signal being associated with a first voltage magnitude; a processing component including one or more comparators, the processing component configured to receive at least the first voltage signal and an input signal and to generate an output signal, the input signal being associated with an input current for a power converter; a pulse-width-modulation generator configured to receive at least the output signal and to generate a modulation signal based on at least information associated with the output signal; and a switch configured to receive the modulation signal and adjust the input current for the power converter; wherein: the processing component is further configured to generate the output signal in a first logic state if an input magnitude for the input signal is larger than an effective threshold magnitude, and to generate the output signal in a second logic state if the input magnitude is smaller than the effective threshold magnitude; the first logic state and the second logic state are different; the effective threshold magnitude remains constant during a first substantial period of time; the effective threshold magnitude changes linearly with time at a slope during a second substantial period of time, the slope being not equal to zero; the effective threshold magnitude remains constant during a third substantial period of time; the first substantial period of time precedes immediately the second substantial period of time; and the second substantial period of time precedes immediately the third substantial period of time.