Electricity: electrical systems and devices – Control circuits for electromagnetic devices – Systems for magnetizing – demagnetizing – or controlling the...
Patent
1982-12-16
1985-04-09
Eisenzopf, Reinhard J.
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
Systems for magnetizing, demagnetizing, or controlling the...
330257, 330297, H01H 4732
Patent
active
045105502
ABSTRACT:
A relay load is connected in the collector path of a first transistor (Q1) of high current carrying capacity. A second transistor (Q2) of similar conductivity type is effectively coupled across the first transistor. The bases of said first and second transistors are connected together. A current mirror circuit (Q3-Q6) is coupled from the collector of said second transistor to said bases to provide the additional base drive necessary to drive the first transistor towards saturation regardless of its Beta when maximum load current is required. The mirror circuit is designed so that the effects of transistor V.sub.be mismatches in the mirror are minimized.
REFERENCES:
patent: 3790862 (1974-02-01), Kampf et al.
patent: 4263562 (1981-04-01), Seiler
patent: 4380728 (1983-04-01), Kearney
AT&T Bell Laboratories
Eisenzopf Reinhard J.
Mullarney John K.
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