Non-continuous sensing apparatus for a temperature control

Details Non-continuous sensing apparatus for a temperature control Non-continuous sensing apparatus for a temperature control

1983-05-31

1985-10-08

Paschall, M. H.

Electric heating

Heating devices

With power supply and voltage or current regulation or...

219499, 219501, 219492, 323235, 307252UA, H05B 102

Patent

active

045462399

ABSTRACT:
A non-continuous sensing device for a temperature control including A.C. power switching element, a zero-crossing detector, a temperature sensor and a trigger pulse generator for generating a trigger pulse used to trigger the A.C. power switching element according to an output of the temperature sensor. The zero-crossing detector generates a pulse signal each time the instantaneous absolute value of the A.C. power voltage decreases to a value equal to or smaller than a predetermined value. The temperature sensor and the trigger pulse generator are kept active only for the duration of the pulse signal generated by the zero-crossing detector, thereby reducing the energy consumption and physical size of the entire device.

REFERENCES:
patent: 3553430 (1971-01-01), Ting
patent: 3590365 (1971-06-01), Nelson
patent: 3633094 (1972-01-01), Clements
patent: 3789190 (1974-01-01), O'rosy et al.
patent: 4081963 (1978-04-01), Stove
patent: 4220840 (1980-09-01), Barker
patent: 4333004 (1982-06-01), Forgue et al.
patent: 4348582 (1982-09-01), Budek

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