Pyrotechnic bridgewire circuit
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United States of America Patent
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-
Apr 24, 2001
Grant Date -
N/A
app pub date -
Dec 18, 1998
filing date -
Dec 18, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A circuit for controlling an electro-explosive device. The circuit includes a heating element, an input circuit and a load control circuit. The load control circuit is responsive to an electrical input provided by the input circuit for energizing the heating element. The heating element selectively causes ignition of the electro-explosive device when its level of energization reaches a firing level. The load control circuit substantially limits current in the heating element when the electrical input is less than a predetermined threshold for maintaining energization of the heating element at a level less than the firing level to prevent the ignition of the electro-explosive device. In contrast, the load control circuit applies substantially all of the electrical input to the heating element when the electrical input signal is greater than the predetermined threshold. This maintains energization of the heating element at a level greater than the firing level to cause the ignition of the electro-explosive device.
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