Circuit arrangement for controlling the temperature of a heating

Details Circuit arrangement for controlling the temperature of a heating Circuit arrangement for controlling the temperature of a heating

1997-06-11

1998-12-08

Paschall, Mark H.

Electric heating

Heating devices

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

219501, 219481, 219505, 307117, H05B 102

Patent

active

058473670

ABSTRACT:
The temperature of a heating element (3), which heating element has a temperature dependent resistance, is measured by comparing the current through it with a user adjustable reference value. The AC voltage across a current sensing resistor (7) in series with the heating element (3) is compared in a comparator (9) with a reference AC voltage generated at a tap (6) of a voltage divider (8). The phase of the logic output signal of the comparator (9) indicates a first state in which the heating element (3) is too hot or is not conducting, or a second state in which the heating element (3) is too cold and conducting. A second comparator (16) detects whether or not the heating element (3) is conducting. A logic gate (18) and a latch (17) switch on the current through the heating element (3) in response to timed pulses from a timing circuit (15) and switch off the current through the heating element (3) when the heating element (3) is conducting and too hot.

REFERENCES:
patent: 3789190 (1974-01-01), Orosy et al.
patent: 3924102 (1975-12-01), Hanekom
patent: 4086466 (1978-04-01), Scharlack
patent: 4590363 (1986-05-01), Bernard
patent: 4778980 (1988-10-01), Rathbun
patent: 5120936 (1992-06-01), Shyu et al.
patent: 5359178 (1994-10-01), Kotani et al.
patent: 5464965 (1995-11-01), McGregor et al.

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