Voltage supply system for a passenger protection installation in a vehicle

Claim 1

A motor vehicle passenger protection voltage supply device for a passenger protection installation in a vehicle, comprising ignition circuit means for providing ignition current to an engine operatively connected between positive potential and ground of a vehicle battery and including safety switch means for closing said ignition circuit means in response to deceleration of said vehicle, at least one primer pellet means for fusibly connecting said safety switch means and controllable power switch means, control circuit means including voltage stabilizer means for providing a stabilized voltage for a trigger sensor means which is operatively connected with the power switch means for the control thereof, a storage condenser means for storing voltage operatively connected in parallel with the ignition circuit means, the control circuit means being operatively connected together with the ignition circuit means to the positive potential and including between its connection with the ignition circuit means, on the one hand and the voltage stabilizer means, on the other, a voltage converter means for converting voltage from one voltage level to another voltage level, a series circuit containing an electronic changeover switch means having at least two outputs for switchably connecting the voltage converter means at one said output into said control circuit means, said changeover switch means being controllable by a threshold comparator means, with one said output of the changeover switch means being directly connectable with the output of the voltage converter means.