Patent ID: 8422252

Claim:
A power supply, comprising: a source of an input supply voltage coupled to a first winding of a transformer: an output switching transistor responsive to a first switching control signal and coupled to said first winding for producing a current in said first winding that is transformer-coupled to a second winding of said transformer to produce a first output supply voltage that energizes a first load circuit, said output switching transistor interrupting said first winding current, during a first portion of a cycle of said first switching control signal, and producing a flyback voltage in said first winding; a first capacitor coupled to said first winding and to a second capacitor to form with respect to said flyback voltage a capacitive voltage divider of a snubber capacitance network that reduces a rate of change of said flyback voltage and produces a capacitive current in each of said first and second capacitors, said capacitive current storing a corresponding charge in each of said first and second capacitors that develops in said second capacitor a first portion of a second supply voltage, said second supply voltage being coupled to a second load circuit; and an inductor coupled to said first capacitor during a second portion of said cycle, when said output switching transistor is conductive to form a resonant circuit of said inductor with said first capacitor for generating from the charge stored in said first capacitor a resonant current that is coupled to said second capacitor, said resonant current storing a charge in said second capacitor for developing a second portion of said second supply voltage.