Electricity: electrical systems and devices – Control circuits for electromagnetic devices – Systems for magnetizing – demagnetizing – or controlling the...
Patent
1982-03-01
1984-06-05
Eisenzopf, Reinhard J.
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
Systems for magnetizing, demagnetizing, or controlling the...
361152, 318685, 318696, H01H 4732
Patent
active
044531940
ABSTRACT:
An integrated power circuit for driving an inductor load including an integrated current sensor is provided. The integrated circuit includes a power transistor in series with the inductive load for operationally conducting a load current of at least 1 amperes and circuitry for applying a predetermined operational voltage across the power transistor. A sensing transistor having an emitter-base junction area less than 10.sup.-3 times the emitter-base junction area of the power transistor and a base terminal common with the base terminal of the power transistor is included in the integrated circuit as is circuitry for applying a predetermined voltage across the sensing transistor. The integrated circuit further includes circuitry for applying a voltage to the common base terminals to activate both the power and sensing transistors whereby a small current mirroring the load current flows through the sensing transistor. The circuitry also senses the current level of the activated sensing transistor. The sensed current may then be used to control the load current by suitable feedback circuitry.
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IBM Technical Disclosure Bulletin, "Controlled Current Gain for Integrated Circuits", P. R. Epley et al., Oct. 1976, pp. 1831-1832.
Frankeny Richard F.
Linton Charles R.
Eisenzopf Reinhard J.
International Business Machines - Corporation
Kraft J. B.
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