Squib ignitor circuit and method thereof

Details Squib ignitor circuit and method thereof Squib ignitor circuit and method thereof

1996-07-02

1999-04-27

Jordan, Charles T.

Ammunition and explosives

Igniting devices and systems

Ignition or detonation circuit

102215, 1022025, 280735, F42C 1100

Patent

active

058981225

ABSTRACT:
A squib ignitor circuit (20,40) reduces the probability of an accidental airbag deployment to greatly increase the safety of an automobile. A squib (24,28,44) operates at a voltage significantly higher than the squib ignitor circuit (20,40) to produce heat sufficient to ignite pyrotechnic material. Thus, a short condition to the squib (24,28,44) does not produce an inadvertent airbag deployment. The squib ignitor circuit (20,40) forms a conductive path through an inductor (23,43) via a first transistor (21,41) and a second transistor (22,42). The inductor (23,43) stores energy. The inductor (23,43) produces a voltage substantially greater than the voltage powering the squib ignitor circuit (20,40) when the conductive path is broken. The inductor (23,43) releases the stored energy to the squib (24,28,44) generating heat. A sequence (more than one time) of storing energy and releasing energy by the inductor (23,43) is required to generate heat sufficient to ignite pyrotechnic material by the squib (24,28,44).

REFERENCES:
patent: 3736837 (1973-06-01), Kaprelian et al.
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patent: 4700263 (1987-10-01), Marshall et al.
patent: 4839772 (1989-06-01), Choi et al.
patent: 4870902 (1989-10-01), Simon et al.
patent: 5053913 (1991-10-01), Lozito et al.
patent: 5347422 (1994-09-01), Smith et al.
patent: 5411289 (1995-05-01), Smith et al.
patent: 5460407 (1995-10-01), Stuckle

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