Systems and methods for regulating output currents of power conversion systems

A system controller for regulating a power conversion system, the system controller comprising:

• a signal generator configured to receive a converted signal and a first compensation signal and generate a second compensation signal based at least in part on the converted signal and the first compensation signal, the converted signal being associated with an input signal for a power conversion system, the first compensation signal being associated with a sensing signal related to a first current flowing through a primary winding of the power conversion system;
• a modulation component configured to receive the second compensation signal and a ramping signal and generate a modulation signal based at least in part on the second compensation signal and the ramping signal;
• and
• a drive component configured to receive the modulation signal and output a drive signal based at least in part on the modulation signal to a switch to affect the first current, the drive signal being associated with an on-time period, the switch being closed during the on-time period;
• wherein the system controller is configured to adjust a duration of the on-time period based at least in part on the converted signal and the second compensation signal.