Patent ID: 7869227

Claim:
A power supply apparatus, comprising: a primary side having one or more elements to be driven according to a first voltage; a secondary side having one or more elements to be driven according to a second voltage; a first transformer to receive an input voltage and to separately provide the first voltage to the one or more elements on the primary side and the second voltage to the one or more elements on the secondary side, the first transformer comprises: a primary coil to receive the input voltage, a secondary coil to induce the second voltage and to provide the second voltage to the one or more elements on the secondary side, an auxiliary coil on the secondary side to induce an intermediate voltage between the input voltage and the first voltage, and a regulator to receive the intermediate voltage from the auxiliary coil, to reduce the intermediate voltage to a voltage which equals the first voltage when the intermediate voltage exceeds the first voltage, and to provide the voltage to the one or more elements on the primary side of the primary coil; and a second transformer to receive the input voltage and to provide a third voltage to an output element.