Fly-forward converter with energy recovery snubber

A converter for transferring energy from a voltage supply to one or more outputs, the converter comprising:

• a first inductive component T1 having a primary winding Ta and at least one secondary winding T1c, the secondary winding T1c being connected to transfer energy from the voltage supply to a respective output when the primary winding is connected to the voltage supply;
• a second inductive component L1 having a primary winding L1a and at least one secondary winding L1b, the secondary winding L1b being connected to store energy from the voltage supply when the primary winding is connected to the voltage supply and to transfer the stored energy to a respective output when the primary winding is subsequently disconnected from the voltage supply;
• a switch S1 for periodically switching between an on-state in which the primary windings T1a, L1a of the first and second inductive components are connected to the voltage supply, and an off-state in which the primary windings are disconnected from the voltage supply;
• an energy recovery capacitor Cs connected to provide a current path between the voltage supply and the primary windings T1a, L1a such that, during the off-state, energy associated with demagnetization of the first inductive component T1 and energy associated with leakage inductance of the first inductive component T1 is, at least in part, transferred to and stored in capacitor Cs;
• and
• an energy recovery winding T1b inductively coupled to the secondary winding T1c of the first inductive component T1, and electrically connected to capacitor Cs during the on-state, such that energy stored in capacitor Cs during the off-state is, at least in part, transferred to the output via the secondary winding T1c during the on-state wherein, in the on-state, V(T1b)=Vout*T1b/T1c, where T1b/T1c is the number of turns on T1b divided by the number of turns on T1c.