Patent ID: 7999521

Claim:
A DC-DC converter for producing, from a single supply input, first and second output voltages of opposite polarities with respect to a common reference potential, comprising: an inductor with a first terminal connectable to a first terminal of the supply input through a first power transistor and a second terminal connectable to a second terminal of the supply input through a second power transistor; a first rectifier element connecting the first terminal of the inductor with a first output terminal; a second rectifier element connecting the second terminal of the inductor with second output terminal; a resistive voltage divider connected between the first and second output terminals; and a control circuit connected and adapted for using an input from the voltage divider as a reference input voltage and providing an output current to the second terminal of the supply input in response to a voltage difference between the reference input voltage and the voltage at the second terminal of the supply input; thereby providing a virtual common reference potential at said second terminal of the supply input.