Solenoid drive circuit

Details Solenoid drive circuit Solenoid drive circuit

1988-07-07

1990-08-07

Pellinen, A. D.

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

Systems for magnetizing, demagnetizing, or controlling the...

323351, 361190, H01H 4732

Patent

active

049472836

ABSTRACT:
A solenoid drive circuit, when providing a holding current to a solenoid by means of periodically turning a drive transistor on and off, by-passes a Zener diode until immediately before the end of a holding period as a result of an on state of a first switching transistor, and interrupts the by-pass of the Zener diode as a result of an off state of the first switching transistor during a time period immediately before the end of the holding period, as above-mentioned, until the lapse of a predetermined time after the end of the holding period. Thereby, current due to a counter-electromotive force is utilized in order to shorten the on time of the drive transistor to thereby save the supply of electric power. Moreover, by interrupting the by-pass of the Zener diode immediately before the end of the holding period, an off-responsibility of current flowing through the solenoid is not disturbed at the end of the holding period.

REFERENCES:
patent: 4225898 (1980-09-01), Weber et al.
patent: 4511945 (1985-04-01), Nielsen
patent: 4520420 (1985-05-01), Ariyoshi et al.
patent: 4556925 (1985-12-01), Yanagida
patent: 4599674 (1986-07-01), Ishikawa et al.

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