Dual coil driver

Details Dual coil driver Dual coil driver

1980-10-01

1982-07-06

Miller, J. D.

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

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

123490, H01H 4704

Patent

active

043386512

ABSTRACT:
A driver circuit, having boost and hold modes of operation, for a solenoid having a high and a low impedance coil wherein the coils are so situated such that their respective magnetic fields are additive and wherein the driver circuit is responsive to input metering pulse width signals and includes means for modifying the duration of each pulse width signal to generate a boost pulse signal to excite the low impedance coil in correspondence with the variations in the battery voltage. The driver circuit further includes means for permitting the current flowing through the low impedance coil into flow into a high impedance coil and means for regulating the value of current flowing therethrough at a determinable value. The driver circuit further includes means for reducing the current droop occurring upon the transition from the boost mode of operation to the hold mode of operation.

REFERENCES:
patent: 3018419 (1962-01-01), Bonn
patent: 3356910 (1967-12-01), Bushnell
patent: 3700985 (1972-10-01), Applequist
patent: 3786344 (1974-01-01), Davis et al.
patent: 4040397 (1977-08-01), Leichle
patent: 4114184 (1978-09-01), Stampfli
patent: 4227231 (1980-10-01), Hansen et al.

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