Patent ID: 7468564

Claim:
An electrical power supply system comprising: an air-powered alternating current electrical generator in which pressurized air from a single source of variable pressure is used to drive an air turbine secured on the shaft of the alternating current electrical generator, there being one nozzle continuously directing air from the single source to the air turbine and at least a second nozzle directing air from the single source to the air turbine being in series with a solenoid-controlled shut-off valve; a rectifier and filter circuit for converting the alternating current output of the generator to a DC voltage; a DC-DC converter connected to the output of the rectifier and filter circuit for providing a DC output voltage appropriate to the intended load; and a comparator/controller receiving a voltage feedback signal taken from the output of the rectifier and filter circuit, whereby when the value of the voltage feedback signal falls below a reference signal, the comparator/controller produces a drive signal that actuates the controlled shut-off valve to direct air from the second nozzle to the air turbine.