Electricity: electrical systems and devices – Control circuits for electromagnetic devices – Systems for magnetizing – demagnetizing – or controlling the...
Patent
1987-06-23
1989-04-25
Hix, L. T.
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
Systems for magnetizing, demagnetizing, or controlling the...
361203, H01H 4700
Patent
active
048253332
ABSTRACT:
A drive circuit for an inductive load includes a switching device connected in series with the load and controlled by a constant frequency oscillator. The mark/space ratio of the signal supplied to the switching device by the oscillator can be varied in accordance with the output of a comparator 18 which compares the measured instantaneous value of the current flowing in the load with a calculated value of the current.
REFERENCES:
patent: 4452210 (1984-06-01), Sasayama et al.
patent: 4546403 (1985-10-01), Nielsen
Clive Robert J.
Emerson Keith R.
Gray David M.
Hix L. T,.
Lucas Industries Public Limited Company
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