Patent ID: 8576587

Claim:
A secondary-side synchronous rectification controller for controlling at least one synchronous rectification switch, comprising: a ramp generator, for receiving a synchronous signal and generating a ramp signal according to the synchronous signal; a peak sampling unit, for retrieving a peak voltage of the ramp signal and generating a predicted reference voltage signal, which gradually declines in voltage level, and the peak sampling unit comprising: a maintaining capacitor, for receiving the ramp signal, and outputting the predicted reference voltage signal from a high-voltage side thereof; a discharging unit for discharging electrical charges stored in the maintaining capacitor; and a reference bias voltage source, for lowering a stored voltage of the maintaining capacitor so as to have a maximum stored voltage smaller than the peak voltage of the ramp signal; and an output control unit, for comparing the ramp signal with the predicted reference voltage signal and generating a dead time control signal to control a conducting state of the synchronous rectification switch.