Electricity: electrical systems and devices – Control circuits for electromagnetic devices – Systems for magnetizing – demagnetizing – or controlling the...
Patent
1984-03-02
1985-10-08
Eisenzopf, Reinhard J.
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
Systems for magnetizing, demagnetizing, or controlling the...
361152, H01H 4732
Patent
active
045464030
ABSTRACT:
A solenoid driver circuit has one transistor and a diode coupled to a solenoid and controlled by a logic circuit to apply a desired current to the solenoid. The transistor is turned on and off using a logic flip-flop to sense a voltage comparison with a peak current. A logic signal is generated as a function of the predetermined length of time, and an output signal is coupled to the base of the transistor to control its on/off states. The magnitude of the peak current is a function of an applied analog voltage. Thus, the magnitude of the average current in the solenoid coil is a function of the applied analog voltage. Also, a dither signal can be summed with the analog signal to minimize the effects of solenoid mechanical sticking and magnetic hysteresis.
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".
Abolins Peter
Eisenzopf Reinhard J.
Ford Motor Company
Sanborn Robert D.
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