Variable frequency solenoid driver circuit

Details Variable frequency solenoid driver circuit Variable frequency solenoid driver circuit

H - Electricity

01

F

H01F 7/18 (2006.01) F16K 31/06 (2006.01) G05F 1/12 (2006.01) H03K 3/017 (2006.01) H03K 17/00 (2006.01)

Patent

CA 2077869

VARIABLE FREQUENCY SOLENOID DRIVER CIRCUIT Abstract of the Disclosure A circuit provides a driving current to a coil of a solenoid. The circuit includes a current sensing feedback resistor in series with the solenoid coil. This current is sensed by a comparator which turns the driving current off when the coil current exceeds a reference level and turns the driving current back on when the current drops below the reference level. The hysteresis of the comparator circuit provides a controllable off and on time, and thus provides a variable frequency driving current which has a peak-to-peak characteristic which remains substantially constant regardless of changes in the input signal and which has an average current value which varies substantially linearly as a function of changing input signal.

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