Inductive drive circuit for setting three different levels of lo

Electricity: electrical systems and devices – Control circuits for electromagnetic devices – Systems for magnetizing – demagnetizing – or controlling the...

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H01H 4732

Patent

active

041763874

ABSTRACT:
Comparator means respond to the current levels through an inductive load to generate HIGH and LOW level outputs causing first switch means to connect and disconnect power to the load. When the load current initially exceeds a peak load actuation level, flip-flop means responsive to the corresponding change in comparator output levels change the current through an auxilliary sense resistor coupled to the sense input of the comparator means. In one embodiment, a one-shot multivibrator prevents a change in the current to the auxilliary sense resistor for a fixed period after the commencement of a load actuation signal. The subsequent HIGH and LOW comparator output levels are fed back to the comparator reference input to switch the reference voltage thereat so as to represent first and second levels of the current sufficient to maintain actuation of the load.

REFERENCES:
patent: 3549955 (1970-12-01), Paine et al.
patent: 3896346 (1975-07-01), Ule
patent: 3982505 (1976-09-01), Rivere
patent: 4041546 (1977-08-01), Stewart

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