Over-voltage protective circuit for semiconductor network

Details Over-voltage protective circuit for semiconductor network Over-voltage protective circuit for semiconductor network

1984-12-17

1987-11-03

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific voltage responsive fault sensor

361 91, 361 92, 307297, 323316, H02H 904

Patent

active

047046546

ABSTRACT:
To protect electrical equipment against excessive applied input signals which, for example, may be analog signals, excessive with respect to positive or negative excess voltage in relation to an upper reference level (U.sub.Ref) and/or a lower reference level (GND), collector current control of the transistor (12) at the input (3) of the protective circuit by three transistors (11, 13, 14) holds the voltage level at the input (3) at the reference voltage level when a driving or signal supply circuit provides an excess voltage. The input transistors, and the further transistors, are connected in the form of a current mirror. The circuit can be constructed in dual form (11-14; 21-24) to provide for protection against negative over-voltage as well. Due to the symmetrical circuit structure, excellent temperature compensation is obtained. The circuit can easily be constructed in the form of an integrated circuit.

REFERENCES:
patent: 4027177 (1977-05-01), Davis
patent: 4268789 (1981-05-01), Nagano
patent: 4350904 (1982-09-01), Cordell
patent: 4496885 (1985-01-01), Nitschke
Analog Integrated Circuit Design by Alan B. Grebene Microelectronics Series, Van Nostrand Co.
Funkschau vol. 26, 1983 pp. 44-47 Versatile, but little known: "Do You Know Current Mirrors?".

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