Limiter circuit for alternating voltages

Details Limiter circuit for alternating voltages Limiter circuit for alternating voltages

1990-10-23

1991-12-17

Callahan, Timothy P.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307557, 307561, 307542, 328169, 328171, H03H 1152

Patent

active

050737325

ABSTRACT:
A limiter circuit for alternating voltages includes a pair of zener diodes arranged in series but in opposite sense. Each zener diode forms an additional current mirror with a respective further transistor so that for each of the two possible directions of the limiter current it is possible to derive a limiter signal current which is decoupled from the actual limited current and which, unlike the actual limiter current, always flows in the same direction. Such a limiter circuit can be used in the input circuit of a bridge rectifier for ringing-current detection in electronic telephone sets connected to two-wire lines.

REFERENCES:
patent: 4419638 (1983-12-01), Johnson
patent: 4445054 (1984-04-01), Ishii
patent: 4536662 (1985-08-01), Fujii
patent: 4571511 (1986-02-01), Dischert et al.
patent: 4804927 (1989-02-01), Yamakoshi et al.

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