Electricity: electrical systems and devices – Control circuits for electromagnetic devices – Systems for magnetizing – demagnetizing – or controlling the...
Patent
1994-09-27
1995-06-06
Pellinen, A. D.
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
Systems for magnetizing, demagnetizing, or controlling the...
361195, 323282, H01H 4704, H01H 4732, H01H 4718
Patent
active
054227801
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.
REFERENCES:
patent: 3116441 (1963-12-01), Gieffers
patent: 3469152 (1969-09-01), Bosman
patent: 4065096 (1977-12-01), Frantz et al.
patent: 4227231 (1980-10-01), Hansen et al.
patent: 4502090 (1985-02-01), Sloan
patent: 5168418 (1992-12-01), Hurley et al.
patent: 5245501 (1993-09-01), Locher et al.
patent: 5317475 (1994-05-01), Siepmann
Fleming Fritz M.
Lee Philip J.
Pellinen A. D.
The Lee Company
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