Heating unit incorporating a temperature sensor

Details Heating unit incorporating a temperature sensor Heating unit incorporating a temperature sensor

1998-10-21

2000-08-08

Paschall, Mark

Electric heating

Heating devices

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

219499, 219501, 219481, 323236, 374 1, H05B 102

Patent

active

06100510&

ABSTRACT:
A control device includes both a heating element and a temperature sensor. The control device has the form of a Wheatstone bridge which applies sensing current to the heating element. When the bridge is unbalanced, the control device may apply heating current to the heating element. In one embodiment, the sensing current is switched, so that it flows only for a relatively small part of the electrical cycle. The circuit also includes a provision for reduction or elimination of electrical spikes. The circuit further includes a calibration arrangement, which enables the user to adjust the bridge without passing heating current through the heating element. Another feature of the invention enables the set point of the bridge to be remotely controlled, by adjusting a level of analog current applied to the bridge. The circuit also includes an arrangement for compensating for temperature-induced changes in its components. It also enables the heating element to be located relatively far from its control circuitry, without suffering from undue losses or inaccuracy.

REFERENCES:
patent: 3679871 (1972-07-01), Evalds
patent: 3789190 (1974-01-01), Orosy et al.
patent: 3939687 (1976-02-01), Waldron
patent: 3946200 (1976-03-01), Juodikis
patent: 3959692 (1976-05-01), Wetzel
patent: 4086466 (1978-04-01), Scharlack
patent: 4845342 (1989-07-01), Chen

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