Electric heating – Heating devices – With power supply and voltage or current regulation or...
Reexamination Certificate
2005-08-09
2005-08-09
Hoang, Tu (Department: 3742)
Electric heating
Heating devices
With power supply and voltage or current regulation or...
C219S494000
Reexamination Certificate
active
06927369
ABSTRACT:
A heating system having an electrical heating conductor arrangement which is integrated into a flexible heating body that can be connected to a supply voltage by a connecting cable and has a first conductor and an adjacent second conductor, placed in series with the first and separated from it by an insulating device, having a heating circuit formed by the heating conductor arrangement and further elements, including a control element for a heating current. A control circuit is connected to the control member for affecting the heating current and regulating the temperature. Monitoring is extended because the insulating device has a resistance characteristic which decreases with temperature. The control circuit is coupled via a monitoring branch to a section of the heating circuit which, as a function of the temperature of the insulating device, responds to a resistance temperature change in the insulating device for picking up an electrical monitoring current or voltage, and the control circuit responds when the monitoring signal exceeds a threshold and interrupts the heating current by triggering the control element.
REFERENCES:
patent: 4205223 (1980-05-01), Cole
patent: 5369247 (1994-11-01), Doljack
patent: 44 80 580 (1997-02-01), None
patent: 0 562 850 (1993-09-01), None
patent: WO 99/30535 (1999-06-01), None
Köhler Ralf
Merk Ernst
Beurer GmbH & Co.
Hoang Tu
Pauley Petersen & Erickson
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