A novel lossless snubber circuit

A simple lossless snubber circuit for use with a switch mode power converter is presented. The circuit uses a capacitor connected between the primary and tertiary windings of a transformer in such a way as to relieve the stress from the power semiconductor switch at both turn-on and turn-off. The energy stored in the leakage inductance of the transformer is recovered via the capacitor and the tertiary winding/diode connection back to the input source. Therefore, both the efficiency of the system and transient working conditions of the switch are improved. An additional diode appropriately connected in the tertiary winding further improves the circuit performance