Multiresonant self-oscillating converter circuit

Claim 1

A direct current power converter comprising a source of direct current voltage, a single transformer having primary windings and a load winding, a pair of transistors connected in a half-bridge configuration across said primary windings of said single transformer, a feedback path for producing oscillations in said transistors and including said primary windings of said single transformer, a multiresonant circuit in said feedback path and including a series inductance effectively connected in series with said load and shunt inductance effectively connected in parallel with said load, and a capacitor effectively connected in series with both said series inductance and said parallel inductance, said capacitor being connected between an intermediate point on one of said primary winding and said source of direct current voltage, and voltage limiting means connected between said source of direct current voltage and one end of said one primary winding for limiting the voltage across said capacitor to a voltage substantially less than said source of direct current voltage.