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An electrically activated ignition circuit system for a gas generator to be used to inflate a gas bag in a motor vehicle.The system includes a bridge circuit including a first ignition filament for igniting gas-producing substances disposed in a gas generating bomb and a second ignition filament for

An electrically activated ignition circuit system for a gas generator to be used to inflate a gas bag in a motor vehicle.The system includes a bridge circuit including a first ignition filament for igniting gas-producing substances disposed in a gas generating bomb and a second ignition filament for exploding a detonator to break a seal for the bomb; a source to supply current to the bridge circuit; and a collision sensor to couple the current from the source to the bridge circuit when a collision occurs. The current first heats the second filament to explode the detonator and then heats the first filament to ignite the gas-producing substances.

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An electrically-activated ignition circuit system for a gas generator for inflating a gas bag in a motor vehicle, said gas generator including a high pressure gas bomb having a first ignition filament for exploding a detonator to break a seal therein and an enclosure containing gas-producing substan

An electrically-activated ignition circuit system for a gas generator for inflating a gas bag in a motor vehicle, said gas generator including a high pressure gas bomb having a first ignition filament for exploding a detonator to break a seal therein and an enclosure containing gas-producing substances having a second ignition filament for burning said gas-producing substances, comprising: a collision sensor, a voltage source connected in series with said collision sensor to form a series circuit, and a bridge circuit having first, second, third and fourth arms, the junction of said first and second arms being connected to one end of said series circuit and the junction of said third and fourth arms being connected to the other end of said series circuit, the first arm of said bridge circuit comprising said first ignition filament, said second and third arms being resistors, and said second ignition filament being connected between the junction of said first and third arms and the junction of said second and fourth arms, the resistive values of said arms and said first and second ignition filaments being such that, upon actuation of said collision sensor, the current through said first ignition filament exceeds a first value required to explode said detonator and destroy said first ignition filament and the current through said second ignition filament is less than a second value required to effectively heat said second ignition filament, destruction of said first ignition filament causing the current through said second ignition filament to immediately increase above said first value thereby being heated sufficiently to burn said gas-producing substances.