Systems and methods with timing control for synchronization rectifier controllers

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

• a first controller terminal;
• and
• a second controller terminal;
• wherein the system controller is configured to:
• receive, at the first controller terminal, an input signal;
• generate a drive signal based at least in part on the input signal, the drive signal being associated with an on-time period and an off-time period, the on-time period including a first beginning and a first end;
• and
• output, at the second controller terminal, the drive signal to a switch to close the switch during the on-time period and open the switch during the off-time period to affect a current associated with a secondary winding of the power converter;
• wherein the system controller is further configured to:
• detect a demagnetization period associated with the secondary winding based at least in part on the input signal, the demagnetization period including a second beginning and a second end, the second beginning being the same as the first beginning, the second end following the first end;
• determine a time duration from the first end to the second end, the time duration minus a first predetermined duration being equal to a duration difference;
• and
• increase the on-time period from a first duration to a second duration based at least in part on the duration difference.