Solenoid switching driver with fast current decay from initial p

Details Solenoid switching driver with fast current decay from initial p Solenoid switching driver with fast current decay from initial p

1983-12-27

1985-04-16

Eisenzopf, Reinhard J.

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

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

361152, 123490, H01H 4732

Patent

active

045119457

ABSTRACT:
A solenoid driver circuit has reduced power consumption by providing relatively fast current decay to a sustaining low current after an initial peak activation current. Subsequent sustaining current peak applications have a smaller magnitude than the initial peak current and are followed by slower decays for a predetermined length of time to a lower current level. Two transistors and a Zener diode are operatively connected to the solenoid and controlled by a logic circuit to apply the desired current to the solenoid. The two transistors are turned on and off using logic flip-flops to sense voltage comparisons with the initial peak current voltage, the sustaining peak current, and the sustaining low current. A logic signal is generated as a function of the predetermined length of time, and an output signal is coupled to the bases of the two transistors to control their on/off states.

REFERENCES:
patent: 3581156 (1971-05-01), Dolbachian et al.
patent: 4180026 (1979-12-01), Schulzke et al.
patent: 4327394 (1982-04-01), Harper
patent: 4347544 (1982-08-01), Ohba
patent: 4360855 (1982-11-01), Ohba
Publication by SGS-ATES Semiconductor Corporation in Jun. 1982 Entitled: Injector Driver Control-Tentative Data.

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