Patent ID: 8767420

Claim:
A power supply for providing power to control a power switch for a high voltage application, the power supply comprising: a high voltage divider arranged to be connected to a first controlled current terminal of the power switch; a step down DC/DC converter connected to an output of the high voltage divider, wherein the step down DC/DC converter is arrange to provide an output voltage for control of the at least one power switch to an output of the power supply; a bypass control unit arranged to control the high voltage divider to short circuit a main input and a main output of the high voltage divider when the voltage across the power switch is lower than a threshold voltage; and a voltage polarity dependent switch arranged to be connected to a second controlled current terminal of the power switch and the output of the step down DC/DC converter; and a step up DC/DC converter connected to the voltage polarity dependent switch and the output of the power supply.