Ignition sensor circuit
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United States of America Patent
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May 11, 1999
Grant Date -
N/A
app pub date -
Apr 14, 1997
filing date -
Apr 14, 1997
priority date (Note) -
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Abstract
A control circuit comprises a plurality of amplifier and filter stages for detecting ignition noise present on the battery line of a vehicle. It applies the filtered and amplified ignition noise signal to a hysteresis latch circuit for providing a control output signal for a solid-state switch coupled between the vehicle battery conductor and a load. Such a circuit provides accurate detection of only ignition noise to provide operating power from a battery line to a circuit to be powered thereby and is immune from extraneous noise frequencies and voltage levels.
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