Heating device comprising a temperature measuring device and methods for temperature measurement at the heating device and for production

Patent metadata

Field	Value
Publication number	US-2021396599-A1
Application number	US-202117304398-A
Country	US
Kind code	A1
Filing date	Jun 21, 2021
Priority date	Jun 23, 2020
Publication date	Dec 23, 2021
Grant date	—

Abstract

A heating device comprising a temperature measuring device has a sheet-like carrier, at least one heating conductor on said sheet-like carrier, an elongate electrode on the sheet-like carrier and a layer structure on the carrier with an insulation layer between the heating conductor and the electrode. A measuring apparatus for detecting local high temperatures at the heating device is connected to the electrode and to the heating conductor. Said measuring apparatus detects a temperature-dependent leakage current through the insulation layer between the heating conductor and the electrode and evaluates this as a measure of a local change in temperature at the heating device. The electrode consists of a material with a temperature dependence of its electrical resistance of between 0.0005/° C. and 0.01/° C. in a temperature range of between 0° C. and 200° C. A temperature measuring device is connected to the electrode for the purpose of measuring a temperature at the electrode using the temperature dependence of the electrical resistance of the electrode.

First claim

1 . A heating device comprising a temperature measuring device for said heating device, where said heating device has:
a sheet-like carrier,
at least one heating conductor on said sheet-like carrier,
an elongate electrode on said sheet-like carrier,
a layer structure on said carrier with an insulation layer between said heating conductor and said electrode,
a measuring apparatus for detecting local high temperatures at said heating device, where said measuring apparatus is connected to said electrode and to said heating conductor and is designed to detect a temperature-dependent leakage current through said insulation layer between said heating conductor and said electrode and to evaluate said temperature-dependent leakage current as a measure of a local change in temperature at said heating device,
wherein:
said electrode consists of an electrode material having an electrical resistance and having a temperature dependence of said electrical resistance, where said temperature dependence lies between 0.0005/° C. and 0.01/° C. or between 500 ppm/K and 10,000 ppm/K in a temperature range of between 0° C. and 500° C.,
said temperature measuring device is connected to said electrode for a purpose of measuring a temperature at said electrode using said temperature dependence of said electrical resistance of said electrode.

2 . The heating device as claimed in claim 1 , wherein said temperature dependence of said electrical resistance of said electrode material lies between 0.0015/° C. and 0.005/° C. or between 1,500 ppm/K and 5,000 ppm/K in said temperature range of between 0° C. and 500° C.

3 . The heating device as claimed in claim 1 , wherein said electrode is at least partially covered by said heating conductor, with said insulation layer therebetween.

4 . The heating device as claimed in claim 3 , wherein a section of said electrode, covered by said heating conductor, runs along a direction of a longitudinal extent of said heating conductor.

5 . The heating device as claimed in claim 4 , wherein a section of said electrode, covered by said heating conductor, runs along at least 70% or 90% of a length of said longitudinal extent of the heating conductor.

6 . The heating device as claimed in claim 1 , wherein said electrode has a width being relatively small in comparison to a length of said electrode, where said length of said electrode is at least 20 times of said width.

7 . The heating device as claimed in claim 1 , wherein said insulation layer has an electrical resistance between a top side and a bottom side or between said heating conductor and said electrode of at least 1 MΩ in a temperature range of between 0° C. and 150° C.

8 . The heating device as claimed in claim 1 , wherein said electrode has a total electrical resistance of between 50Ω and 100 kΩ in said temperature range of between 0° C. and 500° C.

9 . The heating device as claimed in claim 1 , wherein said electrode has a longitudinal extent and has a constant width along said longitudinal extent.

10 . The heating device as claimed in claim 1 , wherein said electrode has a longitudinal extent and has a constant thickness along said longitudinal extent.

11 . The heating device as claimed in claim 1 , wherein said electrode has a content of silver of up to at most 95% as said electrode material.

12 . The heating device as claimed in claim 1 , wherein said electrode material has a variable temperature coefficient of said electrical resistance.

13 . The heating device as claimed in claim 1 , wherein said heating conductor has a plurality of partial heating conductors, wherein said partial heating conductors are interconnected with one another, wherein each of said partial heating conductors covers one said electrode or an electrode section.

14 . The heating device as claimed in claim 13 , wherein connecting sections are provided between said individual partial heating conductors, wherein said connecting sections are composed of a conductor material, said conductor material having a specific electrical resistance, said specific electrical resistance being lower at least by a factor of 10 than in said heating conductor.

15 . The heating device as claimed in claim 1 , wherein at least one additional electrode composed of the same material as said electrode is provided, said additional electrode not being covered or overlapped by one said heating conductor, where a lateral distance between said additional electrode and one said heating conductor is at least 1 mm or at least 2 mm or is twice a width of said electrode.

16 . The heating device as claimed in claim 15 , wherein said additional electrode is also connected to said temperature measuring device.

17 . The heating device as claimed in claim 1 , wherein a carrier insulation layer is applied to said carrier, said at least one electrode is applied to said carrier insulation layer, said insulation layer is applied to this electrode, said heating conductor is applied to said insulation layer, and a covering layer is applied to said heating conductor.

18 . The heating device as claimed in claim 1 , wherein a carrier insulation layer is applied to said carrier, said heating conductor is applied to said carrier insulation layer, an insulation layer or a dielectric layer is applied to said heating conductor, an electrode is applied to said insulation layer or to said dielectric layer, and a covering layer is applied to said electrode.

19 . A method for temperature measurement at a heating device as claimed in claim 1 , wherein in a first step a temperature detection takes place by means of a temperature-dependent leakage current flowing through said insulation layer between said heating device and said electrode, and wherein in a second step temperature measurement takes place at said heating device by way of a change in temperature at said electrode alone being measured.

20 . The method as claimed in claim 19 , wherein a change in temperature at said electrode is evaluated as a change in temperature over time.

21 . A method for producing a heating device as claimed in claim 1 , wherein said heating device has a plurality of said heating conductors, where all of said heating conductors and possibly also partial heating conductors of said heating device are applied in the same method step and from the same heating conductor material.

22 . The method as claimed in claim 21 , wherein said heating conductor has a plurality of partial heating conductors which are interconnected with one another, where each of said partial heating conductors covers an electrode or an electrode section, where all of said heating conductors and possibly also said partial heating conductors of said heating device are applied in said same method step and from said same heating conductor material.

23 . A method for producing a heating device as claimed in claim 1 , wherein said heating device has a plurality of said electrodes, where all of said electrodes of said heating device are applied in the same method step and from the same electrode material.

24 . The method as claimed in claim 23 , wherein said heating device has at least one additional electrode composed of said same material as said electrode and not being covered or overlapped by a heating conductor, wherein a lateral distance between said additional electrode and one said heating conductor is at least 1 mm or at least 2 mm or is twice a width of said electrode.

Assignees

• Ego Elektro Geraetebau Gmbh

Inventors

• Kuemmerle Hannes
• Schmidt Kay
• Schmieder Manuel
• Tafferner Michael
• Zipplies Henry

Classifications

• H05B3/03

  Electrodes · CPC title

• G01K7/16 Primary

  using resistive elements · CPC title

• H05B3/26 Primary

  heating conductor mounted on insulating base {(for transparent areas H05B3/84, H05B3/86)} · CPC title

• H05B3/16

  the conductor being mounted on an insulating base · CPC title

• H05B3/28 Primary

  heating conductor embedded in insulating material · CPC title