Solenoid drive circuit
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United States of America Patent
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-
Jun 6, 1995
Issued Date -
N/A
app pub date -
Sep 27, 1994
filing date -
Dec 22, 1992
priority date (Note) -
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status (Latency Note)
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Abstract
A solenoid drive circuit comprises a timing circuit which activates a voltage control circuit causing a voltage regulator to reduce the voltage output by the driver circuit from a high initial level to a lower holding level sufficient for the solenoid to remain energized. The timing circuit comprises a resistor and capacitor in parallel and the duration of the initial higher voltage output is inversely proportional to the input voltage level. The timing circuit activates a transister in the control circuit changing the equivalent resistance between the adjustment terminal of the voltage regulator and ground thereby causing a reduction in the output voltage.
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