Driver circuit for use with inductive loads or the like

Details Driver circuit for use with inductive loads or the like Driver circuit for use with inductive loads or the like

1981-02-04

1982-11-09

Moose, Jr., Harry E.

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

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

123490, 361154, H01H 4732

Patent

active

043588123

ABSTRACT:
An integrated circuit is operative to produce an output current to a load and for switching the output current when a predetermined peak magnitude of load current is reached to a lower predetermined constant value. The circuit includes an internal power stage rendered conductive for producing maximum load current through the external load which is connected in series therewith in response to an internally generated reference current. The power stage comprises a multi-emitter power transistor with each emitter coupled to a respective emitter ballast resistor such that the load current through one of the resistors may be sensed and compared to the reference current to cause the magnitude of this reference current to be switched from a maximum value to a minimum value when the sensed current is representative of the peak magnitude value of current to thereby reduce the load current until the magnitude thereof is representative of the lower level of reference current.

REFERENCES:
patent: 4234903 (1980-11-01), Harper
patent: 4266261 (1981-05-01), Streit et al.
patent: 4293888 (1981-10-01), McCarty
patent: 4300508 (1981-11-01), Streit et al.

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