Tri-state electrical circuit

Automatic temperature and humidity regulation – Hot-air furnace – Air and fire control

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Details

236 78D, 318599, 361203, G05B 1128

Patent

active

040906647

ABSTRACT:
An electrical circuit having three states depending upon the magnitude of an electrical signal coupled, in operation, to an input thereof, the circuit having a first stable state when the said magnitude is less than a first, predetermined value, a second, stable state when the said magnitude is greater than a second, predetermined value higher than the first said predetermined value, and a third, unstable state when said magnitude is equal to or between said first and second predetermined values. In a development of the invention, the circuit is incorporated in a control apparatus for a ducted, warm-air, central-heating system in which the gas supply to a burner is supplied continuously when the temperature of a space to be heated is below a predetermined temperature, is cut-off when the temperature of the space is above another, higher predetermined temperature, and is switched on and off at a rate dependent upon the magnitude of the temperature when it is equal to or between the two values.

REFERENCES:
patent: 3149293 (1964-09-01), Farkas
patent: 3470892 (1969-10-01), Barker
patent: 3726473 (1973-04-01), Sapir
patent: 3735148 (1973-05-01), Sapir
patent: 3870931 (1975-03-01), Myers

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