Communications: electrical – Continuously variable indicating – With supply voltage regulation or compensation
Patent
1978-11-24
1981-09-29
Groody, James J.
Communications: electrical
Continuously variable indicating
With supply voltage regulation or compensation
340310R, 34087001, 34087042, 363124, G08C 1902, G08C 2502
Patent
active
042926335
ABSTRACT:
A two-wire signal transmitter which isolates for direct current voltages the transducer input circuitry from the transmitter output circuitry. The transmitter superimposes a controlled current signal on the two-wire transmission line which also conducts a direct current power supply voltage to the transmitter. The direct current power supply voltage is transferred to the transducer input circuitry by means of a series direct current to alternating current and alternating to direct current conversions using a transformer for direct current isolation. The direct current transducer input voltage is converted to an alternating current voltage prior to any active signal processing with the processed or any current signal being transferred to the transmitter output circuitry through a direct current isolation transformer. The transferred alternating current signal is converted to a direct current signal by a synchronous detector. A matched dual current generator is utilized in the transducer input circuitry and in the zero reference circuitry to minimize unequal drift due to environmental temperature changes.
REFERENCES:
patent: 3424981 (1969-01-01), Erdman
patent: 3483476 (1969-12-01), Kobayashi
patent: 3581184 (1971-05-01), Hurd
patent: 3757195 (1973-09-01), Sklaroof
patent: 3835408 (1974-09-01), Shaffer
patent: 3931582 (1976-01-01), Kato et al.
patent: 3956707 (1976-05-01), Bruyere
patent: 3959786 (1976-05-01), Chana
patent: 3973202 (1976-08-01), Gardner
patent: 4000473 (1976-12-01), Saito
patent: 4024452 (1977-05-01), Seidel
patent: 4030041 (1977-06-01), Sasaki
patent: 4087758 (1978-05-01), Hareyama
Goodwin, Jr. Perry H.
Kotalik Richard J.
Groody James J.
Robertshaw Controls Company
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