Systems and methods for overvoltage protection for led lighting

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

• a logic controller configured to generate a modulation signal;
• a driver configured to receive the modulation signal, generate a drive signal based at least in part on the modulation signal, and output the drive signal to a switch to affect a current flowing through an inductive winding for a power converter;
• a voltage-to-voltage converter configured to receive a first voltage signal, the modulation signal, and a demagnetization signal, and to generate a second voltage signal based at least in part on the first voltage signal, the modulation signal, and the demagnetization signal;
• and
• a comparator configured to receive a first threshold signal, generate a comparison signal based on at least information associated with the second voltage signal and the first threshold signal, and output the comparison signal to the logic controller;
• wherein:
• the modulation signal indicates an on-time period for the switch;
• the demagnetization signal indicates a demagnetization period for the inductive winding;
• and
• the second voltage signal is approximately equal to the first voltage signal multiplied by a ratio of the on-time period to a sum of the on-time period and the demagnetization period in magnitude.