Patent ID: 6564717
Filing Date: 2003-05-20
Classification: B60R

Abstract:
Circuit arrangement (1) for driving an occupant protection system (3) gas generator (2) whose ignition process can be influenced by a magnetic field, comprising:a) a coil (4) for generating an electromagnetic field, b) a supply voltage source (U) and a parallel self-sufficient capacitor (15), which will supply the gas generator (2) for a period of self-sufficiency in the event of a failure of the supply voltage source (U), c) a control circuit (12), which controls a circuit element (11) connected in series to the coil (4) by pulse width modulation, d) and a free-wheeling diode (10), which is connected in between circuit element (11) and coil (4), in parallel to the coil (4) and with a polarity opposite to the polarity of the supply voltage source (U).