Electricity: power supply or regulation systems – Self-regulating – Using a three or more terminal semiconductive device as the...
Patent
1990-01-13
1993-09-28
Beha, Jr., William H.
Electricity: power supply or regulation systems
Self-regulating
Using a three or more terminal semiconductive device as the...
307254, 3072992, G05F 326
Patent
active
052489329
ABSTRACT:
A current mirror having an output-to-input current ratio less than unity comprises first and second transistors connected in cascode between an output terminal and a reference terminal, with the base drive of each transistor coupled to the same diode junction. Cascoding plural transistors effectively reduces the base-emitter voltage of the output transistor by the collector-emitter voltage of the other transistor, which normally operates at saturation. The other transistor may be a multi-emitter transistor, with one of the emitters coupled to its base and another of which coupled to the reference terminal. By the addition of a resistor between the emitter-collector connection of the cascoded transistors and the input terminal, the operation of the circuit may be changed from that of a current mirror to a current switch. Rather than being referenced to the rectifying junction of a diode, the base drives of the cascoded transistors may be referenced to other junction devices, such as a bipolar transistor, diode-connected bipolar transistor, Schottky diode, or a control (cathode) gate of a silicon controlled rectifier (SCR). The latter connection has particular utility in controlling the turn-off of a gate turn-off thyristor (GTO SCR), such as may be incorporated in a regulated power supply circuit.
REFERENCES:
patent: 3835410 (1974-09-01), Wittlinger
patent: 3936725 (1976-02-01), Schneider
patent: 4092552 (1978-05-01), Hoehn
patent: 4471292 (1984-09-01), Schenck et al.
patent: 4518926 (1985-05-01), Swanson
patent: 4591804 (1986-05-01), van Tuijl
patent: 4689607 (1987-08-01), Robinson
patent: 4879524 (1989-11-01), Bell
Beha Jr. William H.
Harris Corporation
Wands Charles E.
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