Miscellaneous active electrical nonlinear devices – circuits – and – Specific signal discriminating without subsequent control – By frequency
Patent
1995-12-04
1997-07-01
Tran, Toan
Miscellaneous active electrical nonlinear devices, circuits, and
Specific signal discriminating without subsequent control
By frequency
327 40, H03D 1300
Patent
active
056442564
ABSTRACT:
An inherent-security signal comparator (COMP) is driven by two or more input signals (V1, *V2) coming from a control system (.mu.P1, .mu.P2) and generates an alternate output signal (C) of a predetermined frequency whenever both its input signals are identical and terminates its output signal when its input signals wander off from identity, or any of the circuit components of the comparator break down, or its d.c. supply is interrupted. An amplifier (AMP) driven by the comparator drives an isolating transformer (TR) coupled to a voltage rectifier/regulator device (REG) for the supply to the control system. Preferably an oscillator (OSC), whose output is connected to the input of the amplifier (AMP) in common with the output of the comparator, is supplied by a voltage pulse generated by a monostable circuit (T3-R7-R8-R9-C5-C6-D1-D2) which is momentarily enabled at the start-up of the supply circuit.
REFERENCES:
patent: Re33301 (1990-08-01), Oshikiri et al.
patent: 3532994 (1970-10-01), Ferrier
patent: 4564837 (1986-01-01), Awano
patent: 5371417 (1994-12-01), Mirov et al.
Josif Albert
Modiano Guido
REER S.p.A.
Tran Toan
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