Patent attributes
An energy recycle circuit for a flyback circuit and method thereof. The energy recycle circuit has an auxiliary switch coupled in series to a clamp capacitor to form a branch, and the branch is coupled in parallel with the primary winding, or with the primary switch. The energy recycle circuit further has a recycle control circuit to generate an auxiliary switching signal. The auxiliary switch is turned on during a charging process of the clamp capacitor, and is turned off at an end of an immediate subsequent discharging process of the clamp capacitor. The charging process of the clamp capacitor is timed at a first length of time, and the immediate subsequent discharging process of the clamp capacitor is timed at a second length of time, based on an auxiliary switch current signal. The second length of time is adjustable to have an equal time length with the first length of time, or have a unequal time length with the first length of time.
