Temperature controller

Details Temperature controller Temperature controller

1988-10-21

1989-12-05

Paschall, M. H.

Electric heating

Heating devices

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

219212, 219505, 219492, 323235, H05B 102

Patent

active

048854565

ABSTRACT:
A temperature controller compares a temperature detection signal outputted from a temperature sensor with a set temperature preliminary set in a temperature setting circuit. According to a result of the comparison and before a zero-cross point of an AC voltage applied from a commercial AC source to a heating member, a driving circuit of the temperature controller outputs a driving signal to a thyristor to turn ON the thyristor at the zero-cross point. Then the AC voltage is applied to the heating member via the thyristor. Since the determination of turning ON or OFF the thyristor is made before the zero-cross point of the AC voltage applied through the thyristor, the thyristor may surely be turned ON or OFF at the zero-cross point to prevent electromagnetic wave noises from occurring.

REFERENCES:
patent: 4485296 (1984-11-01), Veda et al.
patent: 4546239 (1985-10-01), Sugimori
patent: 4567425 (1986-01-01), Bloomer
patent: 4598195 (1986-07-01), Matsuo
patent: 4680490 (1987-07-01), Baker et al.
patent: 4745262 (1988-05-01), Larsen
Kimata et al., "Washable Electric Blanket with Room-Temperature Sensor," National Technical Report, vol. 30, No. 5, Oct. 1984, pp. 26-34.

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