Patent ID: 8300432

Claim:
An isolated power converter comprising a transformer having a primary side comprising a primary winding to which a primary voltage is applied and a secondary side comprising a secondary winding arranged to mirror the primary voltage and provide an output voltage, and an insulation barrier therebetween, and arranged in such a way that the mirrored primary voltage on the secondary side has a positive potential relative to ground, said converter comprising: a derivating net arranged to cause the second transistor to conduct in dependence of the voltage across the secondary winding, the source of the second transistor being connected to the negative end of the secondary winding, the drain of a third transistor further being connected to the positive end of the secondary winding, a second capacitor and a second resistor being connected between the gate and the source of the third transistor, a third resistor connected between the second resistor and the drain of the second transistor, a third capacitor connected between the sources of the second and third transistors to provide a first output voltage on one terminal of the third capacitor and a second output voltage on the other terminal of the third capacitor.