High voltage protection for an output circuit

Details High voltage protection for an output circuit High voltage protection for an output circuit

1982-08-30

1984-04-03

Salce, Patrick R.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific voltage responsive fault sensor

361 56, 361111, 330298, 357 43, 358243, H02H 720

Patent

active

044411375

ABSTRACT:
A protection circuit is coupled between a low voltage signal processing semiconductor device subject to damage by high voltage transients, and a signal output terminal at which high voltage transients can appear. The protection circuit comprises a first transistor arranged as an emitter follower for normally conducting signals from the semiconductor device to the output terminal, and a second transistor of opposite conductivity type. The base and emitter electrodes of the first transistor are directly connected to the base and emitter electrodes of the second transistor, respectively, such that the second transistor is normally non-conductive. Transient currents associated with negative high voltage transients at the output terminal are diverted to a point of operating potential via the first transistor. The second transistor is rendered conductive in response to positive high voltage transients at the output terminal for diverting associated transient currents to a point of operating potential.

REFERENCES:
patent: 3819952 (1974-06-01), Enomoto et al.
patent: 3882529 (1975-05-01), Warner, Jr.
patent: 4106048 (1978-08-01), Khajezadeh
patent: 4133000 (1979-01-01), Greenstein
patent: 4264941 (1981-04-01), London
patent: 4282556 (1981-08-01), Ipri
patent: 4302792 (1981-11-01), Harwood
"Microelectronics, Digital and Analog Circuits and Systems," Jacob Millman, p. 680, (1980), McGraw-Hill, N.Y.
"Advanced Electronics Circuits," by V. Tietze and Ch. Schenk, p. 152. (1978 Springer-Verlag, N.Y.).
RCA Linear Integrated Circuits Technical Bulletin, (File No. 688), for CA 3121E, (FIG. 2, p. 537). Drawing labeled "Exhibit A," with FIGS. 1 and 2.

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