Abstract: A power supply for providing, from a low voltage source, a high voltage supply for a display device comprises first and second physically separate modules and an electrical conductor therebetween. The first module is adapted to be connected to the low voltage source and contains circuitry operating at low voltage. The second module provides said high voltage supply and contains circuitry operating at high voltage. The electrical conductor between the two modules carries current only at low voltage. This arrangement permits safe disconnection of the power supply, for instance in emergency situations, by breaking the low voltage connection, rather than having to break a high voltage connection. A preferred use of the power supply is to provide a high voltage supply to a display device incorporated into a helmet.

Abstract: A power supply for providing, from a low voltage source, a high voltage supply for a display device comprises first and second physically separate modules and an electrical conductor therebetween. The first module is adapted to be connected to the low voltage source and contains circuitry operating at low voltage. The second module provides the high voltage supply and contains circuitry operating at high voltage. The electrical conductor between the two modules carries current only at low voltage. This arrangement permits safe disconnection of the power supply, for instance in emergency situations, by breaking the low voltage connection, rather than having to break a high voltage connection. A preferred use of the power supply is to provide a high voltage supply to a display device incorporated into a helmet.