System for sensing and/or controlling the level of current in a

Details System for sensing and/or controlling the level of current in a System for sensing and/or controlling the level of current in a

1990-06-08

1992-01-28

Beha, Jr., William H.

Electricity: power supply or regulation systems

Self-regulating

Using a three or more terminal semiconductive device as the...

323277, 323280, 361 93, G05F 156

Patent

active

050846680

ABSTRACT:
A transistor sense electrode (20) is coupled to the input branch (24) of a current mirror (22). The current mirror's branch (26) carries a current substantially equal to the current in the input branch to indicate the current flowing in the transistor. A preferred embodiment includes an amplifier (30) which senses the difference between the voltage at the sense electrode (20) and a reference voltage (Vx). The sensed difference in voltage causes the amplifier to apply a control signal to the current mirror to vary the current in the input branch so as to hold the sense electrode's voltage at the level of the reference voltage (Vx). A preferred package for the system's circuitry is also disclosed.

REFERENCES:
patent: 4319181 (1982-03-01), Wrathall
patent: 4437023 (1984-03-01), Gill, Jr.
patent: 4605891 (1986-08-01), Wrathall
patent: 4654602 (1987-03-01), Aoki
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patent: 4703390 (1987-10-01), Fay et al.
patent: 4750079 (1988-06-01), Fay et al.
patent: 4965510 (1990-08-01), Kriedt et al.
patent: 5008586 (1991-04-01), Miyazaki et al.
patent: 5028861 (1991-07-01), Pace et al.

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