System monitor circuit having first and second phase-sensitive d

Details System monitor circuit having first and second phase-sensitive d System monitor circuit having first and second phase-sensitive d

1982-02-18

1984-08-07

Grimm, Siegfried H.

Communications: electrical

Aircraft alarm or indicating systems

Landing gear indicator

307355, 318565, 328147, 329146, 340945, 340963, G08B 2100

Patent

active

044646615

ABSTRACT:
A pair of simple phase-sensitive full-wave high-gain demodulator circuits generate an output for both halves of an AC reference cycle. One of the demodulator circuits is utilized as an amplifier to drive, for example, the steering system servo valve in an aircraft steering system and the other demodulator drives a dummy load which has a resistivity approximately equal to the resistivity of the servo valve coils. The output current from both demodulators are compared, for example, by an opto isolator or coupler which generates corrective and/or warning signals in case a system failure occurs. In one embodiment, the sensor output loop is maintained at a predetermined voltage level above ground so that an open circuit in the sensor loop is detected by additional sensing circuits.

REFERENCES:
patent: 2953323 (1960-09-01), Minch
patent: 4221350 (1980-09-01), Moser et al.

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