Patent ID: 7940536

Claim:
A flyback converter circuit including synchronous rectification comprising: a DC input operable to receive a DC voltage from a DC voltage source; a transformer including a primary coil and a secondary coil; a primary switch operable to selectively connect the primary coil to the DC input; a controller operable to provide a control signal to turn the primary switch ON and OFF, wherein the primary coil is connected to the DC input when the primary switch is ON; a delay device operable to delay an ON pulse of the control signal provided to the primary switch such that the primary switch is turned on after a delay of a predetermined period of time; and a series combination comprising a secondary switch connected in series with a capacitor, the series combination connected in parallel with the primary switch, the secondary switch controlled by the control signal from the controller; wherein the control signal from the controller turns the secondary switch ON during the delay, such that a transient is induced in the primary coil before the primary switch is turned ON.