Patent ID: 8891256

Claim:
A system for regulating a power converter, the system comprising: a comparator configured to receive a first signal and a second signal and generate a comparison signal based on at least information associated with the first signal and the second signal, the first signal being associated with at least an output current of a 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 driver component configured to receive the modulation signal and output a drive signal to a switch to adjust a primary current flowing through a primary winding of the power converter; wherein: the modulation signal is associated with a modulation frequency corresponding to a modulation period; the modulation frequency increases with the output current at a first slope within a first current range; the modulation frequency increases with the output current at a second slope within a second current range; the modulation frequency increases with the output current at a third slope within a third current range; the first current range and the third current range are separated by at least the second current range; and each of the first slope, the second slope, and the third slope is larger than zero; wherein: the primary current is associated with a peak magnitude for each modulation period; the peak magnitude remains constant or increases with respect to the output current at a fourth slope within a fourth current range, the fourth slope being equal to or larger than zero; the peak magnitude increases with the output current at a fifth slope within a fifth current range, the fifth slope being larger than zero; the peak magnitude remains constant or increases with respect to the output current at a sixth slope within a sixth current range, the sixth slope being equal to or larger than zero; and the fourth current range and the sixth current range are separated by at least the fifth current range.