Electro-pyrotechnic initiation system protected against electrostatic discharges
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United States of America Patent
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Apr 24, 2001
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N/A
app pub date -
Oct 6, 1999
filing date -
Oct 6, 1998
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Abstract
The electro-pyrotechnic initiation system preferably comprises an electro-pyrotechnic initiator (1) consisting especially of an insulating support (14) over which a flat resistive heating element (3) and two separate conductive metal areas (15, 16) are extended, the said resistive heating element and the said conductive metal areas being electrically connected to a current source (2) by means of two electrodes (9, 10). A conductive filter device (5), connected in parallel with the said resistive heating element (3), is divided into a varistor (6) and into a capacitor (7) which are connected to the electrodes (9, 10). This conductive filter device (5) has an equivalent resistance which varies depending on the measured electric potential difference between the two electrodes (9, 10) and ensures that the initiator (1) is not operated when the latter is subjected to a high-voltage electrostatic discharge. This electro-pyrotechnic initiation system is more especially designed to be incorporated into a pyrotechnic gas generator or into a seat belt retractor used for motor-vehicle safety.
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