Multi channel temperature controller utilizing electronic multip

Details Multi channel temperature controller utilizing electronic multip Multi channel temperature controller utilizing electronic multip

1987-01-12

1989-10-17

Yusko, Donald J.

Communications: electrical

Continuously variable indicating

Condition responsive

34087013, 340870110, 374175, G08C 1930

Patent

active

048750425

ABSTRACT:
This multi channel temperature controller includes several temperature sensors, an electronic multiplexer which receives output signals from these temperature sensors and which sequentially supplies these signals to its output according to the switching action of a selection signal, and an amplifier which receives the output of the electronic multiplexer. Thereby, noise such as due to thermal electro motive force generated in the contacts of prior art sets of reed relays for switching over such temperature sensor output signals can be eliminated. Further, optionally, there may be provided several input circuits, one interposed between each of these temperature sensors and the electronic multiplexer, and each including a capacitor which has electrostatic capacitance substantially greater than the electrostatic capacitance existing between its input circuit and the corresponding temperature sensor. Thereby, common mode voltage noises are eliminated or minimized.

REFERENCES:
patent: 3800300 (1974-03-01), Van Oosterhout
patent: 4122719 (1978-10-01), Carlson et al.
patent: 4215336 (1980-07-01), Smith
patent: 4480312 (1984-10-01), Wingate
patent: 4557608 (1985-12-01), Carver
patent: 4563682 (1986-01-01), Merkel
patent: 4680585 (1987-07-01), Fasching
patent: 4704609 (1987-11-01), Rittenberry et al.
"Sense Temp. Remotely with IC Temp./Current Transducers", by Walter G. Jung, Electronic Design, Sep. 1, 1978.

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