Abstract: A control circuit for a power converter. The control circuit may provide a first switch driving signal and a second switch driving signal that may be respectively used to control a first power switch and a second power switch. The control circuit may change the second switch driving signal from a second driving reset logic state to a second driving set logic state after a dead time expires since a moment when the first switch driving signal is changed from a first driving set logic state to a first driving reset logic state. The control circuit may further adaptively adjust the dead time to vary in a same direction as a capacitance parameter of the first power switch and a capacitance parameter of the second power switch vary.

Abstract: A method for detecting a variation of input voltage. The method is generating an indication signal based on the input voltage, and comparing the input voltage with a first reference signal. The first reference signal is smaller than the indication signal, and if the input voltage is consistently smaller than the first reference signal during a first time duration from the moment when the input voltage is decreased to the first reference signal, the indication signal is decreased after the first time duration.

Abstract: A control circuit for a power converter. The control circuit may provide a first switch driving signal and a second switch driving signal that may be respectively used to control a first power switch and a second power switch. The control circuit may change the second switch driving signal from a second driving reset logic state to a second driving set logic state after a dead time expires since a moment when the first switch driving signal is changed from a first driving set logic state to a first driving reset logic state. The control circuit may further adaptively adjust the dead time to vary in a same direction as a capacitance parameter of the first power switch and a capacitance parameter of the second power switch vary.

Abstract: A method for detecting a variation of input voltage. The method is generating an indication signal based on the input voltage, and comparing the input voltage with a first reference signal. The first reference signal is smaller than the indication signal, and if the input voltage is consistently smaller than the first reference signal during a first time duration from the moment when the input voltage is decreased to the first reference signal, the indication signal is decreased after the first time duration.