Safety temperature circuit including zero crossing detector

Details Safety temperature circuit including zero crossing detector Safety temperature circuit including zero crossing detector

1985-05-01

1986-07-01

Paschall, M. H.

Electric heating

Heating devices

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

219501, 219499, 219508, 323235, H03B 102

Patent

active

045981957

ABSTRACT:
A temperature control apparatus has a first comparator circuit for comparing the voltage corresponding to thermal data provided by a thermal sensor with a first reference voltage generated in synchronism with the zero crossings of an AC power source. The first comparator circuit generates a pulsative output voltage which is synchronous with the zero crossings of the AC power source. This output voltage causes a second reference voltage to be applied to a second comparator circuit in the form of a pulsative voltage. The second comparator circuit compares the thermal data voltage with the second reference voltage and generates a pulse signal. This pulse signal drives a trigger circuit which triggers a thyristor connected to an electric heater.

REFERENCES:
patent: 3548155 (1970-12-01), Rabindran
patent: 3646577 (1972-02-01), Ernst
patent: 3821516 (1974-06-01), Hayes et al.
patent: 4029937 (1977-06-01), Russell
patent: 4086466 (1978-04-01), Scharlack
patent: 4278873 (1981-07-01), Petrides
patent: 4296312 (1981-10-01), Salem

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