Electrical transmission or interconnection systems – Personnel safety or limit control features – Interlock
Patent
1991-04-03
1992-05-05
Zazworsky, John
Electrical transmission or interconnection systems
Personnel safety or limit control features
Interlock
307362, H03K 5153
Patent
active
051110717
ABSTRACT:
A threshold detection circuit (10) is provided which comprises an input node (12) and an output node (14). The input node (12) is coupled to a current mirror (22) through a resistor (32). The current mirror (22) is further coupled to another current mirror (16), which is arranged to receive a reference current proportional to absolute temperature. The reference current is mirrored and, having been increased by a multiplier is received by a current sink (28). When the voltage level at the input node (12) exceeds a predetermined voltage threshold level, the current exceeding the amount sinkable by the current sink (28) is directed to the base of a switching transistor (30) coupled to the output node (14), and produces an output voltage level at the output node (14) indicative of the threshold voltage level being reached an/or exceeded at the input node (12). The predetermined threshold voltage may be at a level exceeding the circuit supply voltage level and is independent of ambient operating temperature.
REFERENCES:
patent: 3942044 (1976-03-01), Armstrong
patent: 4384219 (1983-05-01), Davis
patent: 4463271 (1984-07-01), Gill, Jr.
patent: 4634902 (1987-01-01), Tanaka et al.
D. M. Taub, "Current-Threshold Circuit", IBM Technical Disclosure Bulletin vol. 17, No. 3, Aug. 1974, p. 750.
Jones Steven C.
Kwan Stephen C.
Barndt B. Peter
Donaldson Richard
Hiller William E.
Texas Instruments Incorporated
Zazworsky John
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