Load current control device

Details Load current control device Load current control device

1986-07-02

1988-05-17

Hix, L. T.

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

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

318599, 180142, H01H 4700, G05B 1128, B62D 506

Patent

active

047455144

ABSTRACT:
A load current control device operates so as to control the magnitude of a current delivered to a load by varying a duty factor. With this control device, a fundamental value is determined on the basis of an instruction of an input signal, and a reference duty factor and a reference current value are determined on the basis of the fundamental value. The control device further operates to correct the reference duty factor on the basis of a difference between the magnitude of a current actually flowing in the load and the reference current value to turn on and off a power supplied in accordance with the corrected duty factor, therby to control the magnitude of the load current. In addition, when the above-said difference is out of a predetermined range, this load current control device outputs a signal indicative of abnormal condition.

REFERENCES:
patent: 4454573 (1984-06-01), Petsch et al.
patent: 4624335 (1986-11-01), Shiraishi et al.
patent: 4628885 (1986-12-01), Ogburn et al.

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