Inductive load driver circuit effecting slow hold current delay

Details Inductive load driver circuit effecting slow hold current delay Inductive load driver circuit effecting slow hold current delay

1978-02-27

1980-11-18

Miller, J. D.

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

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

123490, H03K 114

Patent

active

042349036

ABSTRACT:
An inductive load driver circuit comprising first and second switch means and high and low impedance load current decay means. For the duration of a load actuation signal the first switch means are responsive to the magnitude of the load current to complete and interrupt a first current path to the load to cycle the load current between first and second levels. The second switch means are enabled for the duration of the load actuation signal to complete a second current path to the load when the first switch means interrupts the first current path. When completed the second current path comprises the low impedance decay means allowing the load current to decay slowly from the first current level to the second level to provide during such slow decay a load current sufficient to maintain actuation of the inductive load. The end of the load actuation signal disables the second switch means to interrupt the second current path and thereby require the load current to decay rapidly through the high impedance decay means. In one embodiment, the second switch means comprise an SCR disabled by a final momentarily turn ON of the first switch means.

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