EP2641452B1 - Flächenheizkörper mit temperaturüberwachung - Google Patents

Flächenheizkörper mit temperaturüberwachung Download PDF

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Publication number
EP2641452B1
EP2641452B1 EP11805429.5A EP11805429A EP2641452B1 EP 2641452 B1 EP2641452 B1 EP 2641452B1 EP 11805429 A EP11805429 A EP 11805429A EP 2641452 B1 EP2641452 B1 EP 2641452B1
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EP
European Patent Office
Prior art keywords
measuring
current path
measurement current
heating
current paths
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP11805429.5A
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German (de)
English (en)
French (fr)
Other versions
EP2641452A1 (de
Inventor
Christoph Degen
Dang Cuong Phan
Mitja Rateiczak
Andreas Schlarb
Stefan Droste
Robert Drese
Gunther Vortmeier
Patrick Weber
Olaf Eckelt
Walter Schreiber
Giordano Soma
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Saint Gobain Glass France SAS
Compagnie de Saint Gobain SA
Original Assignee
Saint Gobain Glass France SAS
Compagnie de Saint Gobain SA
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Priority to EP11805429.5A priority Critical patent/EP2641452B1/de
Publication of EP2641452A1 publication Critical patent/EP2641452A1/de
Application granted granted Critical
Publication of EP2641452B1 publication Critical patent/EP2641452B1/de
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Anticipated expiration legal-status Critical

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B1/00—Details of electric heating devices
    • H05B1/02—Automatic switching arrangements specially adapted to apparatus ; Control of heating devices
    • H05B1/0227—Applications
    • H05B1/023—Industrial applications
    • H05B1/0236—Industrial applications for vehicles
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/84—Heating arrangements specially adapted for transparent or reflecting areas, e.g. for demisting or de-icing windows, mirrors or vehicle windshields
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/20—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater
    • H05B3/22—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater non-flexible
    • H05B3/26—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater non-flexible heating conductor mounted on insulating base
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/20—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater
    • H05B3/22—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater non-flexible
    • H05B3/26—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater non-flexible heating conductor mounted on insulating base
    • H05B3/265—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater non-flexible heating conductor mounted on insulating base the insulating base being an inorganic material, e.g. ceramic
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/035—Electrical circuits used in resistive heating apparatus

Definitions

  • the invention is in the technical field of surface heaters and relates to a surface heater with temperature monitoring.
  • Surface heating elements with an electrical heating layer are used in manifold ways. They are well known as such and have been described many times in the patent literature. For example only in this context, the documents DE 102008018147 A1 . DE 102008029986 A1 . DE 10259110 B3 and DE 102004018109 B3 directed.
  • transparent panel radiators are used in motor vehicles as windshields, since the field of vision of windshields may not have any visual restrictions due to legal requirements. Due to the heat generated by the heating layer condensed moisture, ice and snow can be removed within a short time. In living rooms they can be used instead of conventional radiators for living room heating, for which purpose they are mounted, for example, on walls or free standing.
  • Surface heating elements can be used equally as heatable mirrors or transparent decorative parts.
  • the problem may arise that due to objects located on the heating layer, the heat produced is no longer sufficiently dissipated to the environment. As a result, a local overheating ("hot spot") may occur. This can happen, for example, in surface heating elements used for space heating by accidentally covered over garments. Due to the local overheating, the heating layer can be impaired and possibly even damaged.
  • hot spot a local overheating
  • the object of the present invention is to develop conventional surface heating elements in such a way that in particular transparent Surface heating a temperature monitoring in a simple and reliable way is possible.
  • a surface heating element with at least one planar substrate and an electrically conductive, heatable, preferably transparent coating is shown.
  • the heatable coating is designed so that its electrical resistance changes with a variation of the temperature.
  • the heatable coating extends over at least part of a substrate surface of the planar substrate.
  • the surface heating element is further provided with at least two connection electrodes provided for electrical connection to the two poles of a voltage source, which are electrically connected to the conductive coating in such a way that a heating current flows in a heating field formed by the conductive coating by applying a supply voltage.
  • the heating field has one or more heating current paths for conducting the heating current introduced via the two connection electrodes, which is introduced into the conductive coating by means of a conductive coating which is free, i. coating-free (electrically isolated) separation areas, for example, line-shaped separation areas (dividing lines) are formed.
  • the heating current paths are thus formed by the conductive coating. With a transparent coating, the heating current paths are accordingly transparent.
  • the surface heating element according to the invention can be designed in many ways and serve, for example as a flat radiator for living room heating, as a heated mirror, heated decorative part or heated disc, especially windshield or rear window of a motor vehicle, this list is merely exemplary and is not intended to limit the invention in any way.
  • the surface heating element comprises one or more measuring current paths formed as conductor tracks in the conductive coating, which measuring paths are at least partially different from the heating current paths.
  • the measuring current paths are free in the conductive coating by means of the conductive coating, that is coating-free (electrically isolated) separation areas, for example, line-shaped separation areas (dividing lines), molded.
  • the measuring current paths are thus formed by the conductive coating.
  • the measuring current paths are transparent.
  • each measuring current path is thermally coupled at least to a partial area of the heating field and has at least two connecting sections for connecting a measuring device for determining its electrical resistance.
  • the measuring current paths are provided for conducting a measuring current introduced via the connection sections for measuring the electrical resistance.
  • the measuring current paths can have a greater electrical resistance per length than the heating current paths, which results, for example, from a smaller width of the measuring current paths transversely to the direction of extent.
  • the surface heating element according to the invention thus advantageously makes it possible to determine the temperature of the measuring current paths thermally coupled in each case to at least one subarea of the heating field by determining the electrical resistance of the measuring current paths. In this way, in particular local overheating in the area of the heating field can be detected reliably and safely.
  • the measuring current paths can be produced in a simple manner by structuring the conductive coating, the measuring current paths being transparent in the case of a transparent conductive coating, so that the temperature of the heating field can be monitored in a particularly advantageous manner even in transparent surface heating elements.
  • the measuring current paths are formed at least in sections, in particular completely, in an edge strip which is electrically separate from the heating field and surrounds the heating field. This measure allows a particularly simple contacting of the connection sections of the measuring current paths in the edge strip.
  • the measuring current paths for the detection of near-edge hot spots may have a course extending along the substrate edge.
  • the measuring current paths can in particular at least partially in be formed from each other different portions of the edge strip, whereby a spatially resolved detection of hot spots in the heating field is possible.
  • each measuring current path is formed so that they repeatedly change their path direction in a spatially limited zone of the edge strip, hereinafter referred to as "measuring zone".
  • the measuring current paths may have, for example, a meandering curved course in the measuring zones, it being equally possible for any other course to be provided with a mutual or opposing change in the path direction.
  • each measuring current path comprises a plurality of oppositely curved current path sections. In each case, a relatively large proportion of the conductor track of a measuring current path is contained in the measuring zones, which is accompanied by a correspondingly large voltage drop of a measuring voltage applied to the terminal sections.
  • the measuring zones thus enable detection of hot spots with high sensitivity and particularly good spatial resolution. It may also be advantageous if the measuring zones are spatially distributed over at least a portion of the edge strip, in particular spatially evenly distributed, whereby a particularly good spatial resolution in the detection of hot spots of the heating field is possible.
  • the measuring current paths are electrically separated from the heating field. This can be achieved, for example, in that the measuring current paths are completely contained within the edge strip that is electrically insulated from the heating field. By this measure heating and measuring current are electrically isolated, so that the determination of the electrical resistance of the measuring current paths is particularly simple.
  • one or more measuring current paths each have a measuring current path section which is part of a heating current path or is formed by a complete heating current path.
  • a connection electrode connected to the heating current path can serve in particular as a connection section of a measuring current path.
  • the electrical resistance of the path portion of a measuring current path not formed by the heating current path may in particular be greater than that in the rest of the measuring current path, which can be realized in a simple manner by a correspondingly smaller width of the conductor track.
  • measuring current paths of the space requirement in the edge strip is reduced, so that more measuring current paths can be formed with a given dimensioning of the edge strip in the conductive coating.
  • the formation of measuring zones in the edge strip is facilitated.
  • connection electrodes are electrically connected to two interconnected measuring current paths, in each of which two measuring current paths are connected in series, each measuring current path series being arranged via a connection section arranged between the two serially connected measuring current paths for connecting the measuring device for determining the electrical resistance.
  • the measuring current paths can be connected to a Wheatstone bridge known per se to those skilled in the art, which enables a particularly accurate detection of changes in the resistance of the measuring current paths.
  • At least one measuring current path serves as a reference current path for detecting a reference resistance for other measuring current paths.
  • the invention furthermore extends to an arrangement having a surface heating element as described above, which has at least one measuring device connected to the connection sections of the measuring current paths for determining electrical resistances and a control and monitoring device connected to the measuring device in terms of data technology.
  • the control and monitoring device is set up by the program in such a way that the supply voltage applied to the connection electrodes is switched off or at least reduced if the electrical resistance of a measuring current path exceeds a predeterminable (selectable) threshold value.
  • the control and monitoring device is for this purpose electrically connected to a device coupled to the voltage source for providing the supply voltage, by means of which the supply voltage can be reduced or switched off.
  • control and monitoring device with a visual and / or acoustic output device for outputting optical and / or acoustic signals is connected by data technology, wherein the control and monitoring device is arranged so that an optical and / or acoustic Signal is output, if the electrical resistance of a measuring current exceeds the said or another predeterminable threshold.
  • the invention further extends to a method for operating a surface heating element having at least one planar substrate and an electrically conductive coating which extends over at least part of the substrate surface and electrically connected to at least two connection electrodes provided for electrical connection to the two poles of a voltage source is that by applying a supply voltage, a heating current flows in a heating field.
  • the surface heating element may in particular be a surface heating element as described above.
  • the electrical resistance of one or more measuring current paths thermally coupled to the heating field is determined, wherein the measuring current paths are each formed by coating-free separating regions, for example dividing lines, in the conductive coating and are formed by the conductive coating.
  • the supply voltage is reduced or switched off, if the electrical resistance of a measuring current exceeds a predeterminable threshold value.
  • an optical and / or acoustic signal is output if the electrical resistance of a measuring current path exceeds said or another predeterminable threshold value.
  • the invention further extends to the use of a surface heating element as described above as functional and / or decorative single piece and as built-in furniture, appliances and buildings, especially as a radiator in living rooms, such as wall-mounted or free-standing radiator, as well as in locomotion for locomotion on land, in the air or on water, especially in motor vehicles, for example, as a windshield, rear window, side window and / or glass roof.
  • a surface heating element as described above as functional and / or decorative single piece and as built-in furniture, appliances and buildings, especially as a radiator in living rooms, such as wall-mounted or free-standing radiator, as well as in locomotion for locomotion on land, in the air or on water, especially in motor vehicles, for example, as a windshield, rear window, side window and / or glass roof.
  • FIG. 1 considered, as the first embodiment of the invention, a designated generally by the reference numeral 1 surface heating element or a surface heating element 1 containing arrangement 39 is illustrated.
  • the surface heater 1 is used for surface heat generation and can be used for example instead of a conventional radiator for heating a living room. He can to this Purpose, for example, attached to a wall or integrated into it, but also a free-standing mounting is possible. It is also conceivable to form the surface heating element 1 as a mirror or decorative part.
  • Another exemplary application of the surface heating element 1 is the use as a vehicle window, in particular windshield, of a motor vehicle.
  • the surface heating element 1 comprises at least one planar substrate 2 made of an electrically insulating material, the surface heating element 1 having a single substrate 2 as a single-pane glass and two bonded substrates 2 firmly bonded together by a thermoplastic adhesive layer as a composite pane.
  • the substrate 2 can be made of a glassy material, for example float glass, cast glass or ceramic glass or a non-glass material, for example plastic, in particular polystyrene (PS), polyamide (PA), polyester (PE), polyvinyl chloride (PVC), polycarbonate (PC), polymethyl methacrylate (PMA) or polyethylene terephthalate (PET).
  • PS polystyrene
  • PA polyamide
  • PE polyester
  • PVC polyvinyl chloride
  • PC polycarbonate
  • PMA polymethyl methacrylate
  • PET polyethylene terephthalate
  • any material having sufficient chemical resistance, suitable dimensional and dimensional stability, and, if desired, sufficient optical transparency may be used.
  • plastic in particular based on polyvinyl butyral (PVB), ethylene-vinyl acetate (EVA) and polyurethane (PU), can be used as the adhesive layer for bonding the two substrates 2 in a composite pane.
  • PVB polyvinyl butyral
  • EVA ethylene-vinyl acetate
  • PU polyurethane
  • the surface heating element comprises a rectangular substrate 2 with a circumferential substrate edge 4, which is composed of two short edges 5 and two long edges 6. It is understood that the invention is not limited to this, but that the substrate 2 can also have any other form suitable for practical use, for example a square, round or oval shape. Depending on the application of the surface heating element 1, the substrate 2 may be rigid or flexible. The same applies to its thickness, which can vary widely and for a glass substrate 2, for example, in the range of 1 to 24 mm.
  • a planar heat generation of the surface heating element 1 comprises an electrically conductive, heatable coating 3, which is applied here for example on a (main) surface or substrate surface 42 of the substrate 2.
  • the coating decreases 3 more than 50%, preferably more than 70%, more preferably more than 80% and even more preferably more than 90% of the substrate surface 42 of the substrate 2 a.
  • the coating 3 can be applied over the full area to the substrate surface 42.
  • the area covered by the coating 3 can, depending on the application, for example, range from 100 cm 2 to 25 m 2 .
  • such a carrier can be a plastic film which consists, for example, of polyamide (PA), polyurethane (PU), polyvinyl chloride (PVC), polycarbonate (PC), polyester (PE) or polyvinyl butyral (PVB).
  • a support can also be bonded to adhesive films (eg PVB films) and bonded as a three-layered layer structure to the two substrates 2 of a composite pane.
  • the coating 3 contains or consists of an electrically conductive material.
  • TCO transparent conductive oxides
  • TCO is preferably indium tin oxide, fluorine-doped tin dioxide, aluminum-doped tin dioxide, gallium-doped tin dioxide, boron-doped tin dioxide, tin zinc oxide or antimony-doped tin oxide.
  • the coating 3 may consist of a conductive single layer or a layer structure which contains at least one conductive partial layer.
  • such a layer construction comprises at least one conductive partial layer, preferably silver (Ag), and further partial layers such as anti-reflection and blocking layers.
  • the thickness of the coating 3 may vary widely depending on the application, wherein the thickness at any point may be, for example, in the range of 30 nm to 100 microns. In the case of TCO, the thickness is, for example, in the range of 100 nm to 1.5 ⁇ m, preferably in the range of 150 nm to 1 ⁇ m and more preferably in the range of 200 nm to 500 nm.
  • the coating 3 can be subjected to high thermal loads, see above that it withstands the temperatures required for bending (tempering) a pane of glass used as substrate 2, typically more than 600 ° C without impairment of function. Equally, however, a thermally low-loadable coating 3 can be provided, which is applied after the tempering of the glass sheet. Likewise, the coating 3 can be applied to a substrate 2 which will not be biased.
  • the sheet resistance of the coating 3 is preferably less than 20 ohms per unit area and is for example in the range of 0.25 to 20 ohms per unit area. In the exemplary embodiment shown, the sheet resistance of the conductive coating 3 is a few ohms per unit area and is, for example, 1 to 2 ohms per unit area.
  • CVD chemical vapor deposition
  • PVD physical vapor deposition
  • the coating 3 is applied to the substrate 2 by sputtering (magnetron sputtering).
  • Fig. 1 it can be advantageous for its practical application, for example, as a freestanding radiator or windshield of a motor vehicle when it is transparent to visible light in the wavelength range of 350 nm to 800 nm, wherein the term "transparency" is a light transmittance of more than 50%, preferably more than 70% and especially preferably more than 80%.
  • This can be achieved, for example, by a transparent substrate 2 made of glass and a transparent coating 3 based on silver (Ag).
  • the conductive coating 3 is provided along the substrate edge 4 with a peripheral, electrically insulated, first parting line 7, which here, for example, a distance of a few cm, in particular 1 to 2 cm, from the substrate edge 4 has.
  • An outer edge strip 8 of the conductive coating 3 is electrically divided by an inner remainder of the conductive coating 3, which serves as a heating field 9, through the first parting line 7.
  • the edge strip 8 causes an electrical insulation of the heating field 9 to the outside and protects it against penetrating from the substrate edge 4 corrosion.
  • the coating 3 can be circumferentially removed to improve the edge insulation in a, for example, a few millimeters wide part of the edge strip 8, which Fig. 1 not shown in detail.
  • connection electrodes 10, 11 are provided with the heating field 9, which are arranged here, for example, at the lower long edge 6 near the right short edge 5.
  • the connection electrodes 10, 11 are used to apply a supply voltage supplied from the outside to the heating field 9, wherein areally heat is emitted from the heating field 9 by the introduced heating current.
  • the two connection electrodes 10, 11 can be connected for this purpose to the two poles of a voltage source (not shown).
  • the connecting electrodes 10, 11, which are in each case in the form of quarter-slices, are for example made of a metallic printing paste in the printing process, in particular screen printing processes.
  • connection electrodes 10, 11 for example, from a metal foil, and then to electrically connect them to the heating field 9, in particular by soldering. It is irrelevant whether first the coating 3 is deposited on the substrate 2 and then the connection electrodes 10, 11 are produced or whether first the connection electrodes 10, 11 are manufactured and then the coating 3 is deposited.
  • the specific electrical resistance for connection electrodes 10, 11 produced in particular in the printing method is, for example, in the range from 2 to 4 ⁇ Ohm.cm.
  • the heater 9 is divided by a family of electrically insulated, second parting lines 30 in a plurality of electrically parallel connected Walkerstrompfade 12.
  • the heating current paths 12 each begin at the one, first connection electrode 10 and terminate at the other, second connection electrode 11, the part of the heating field 9 immediately adjacent to the two connection electrodes 10, 11 being free of second separation lines 30.
  • a defined profile of the heating current introduced by the two connection electrodes 10, 11 in the heating field 9 can be achieved along the heating current paths 12 defined by the second separating lines 30.
  • the electrical resistance for a desired heating power can be set specifically.
  • the subdivision of the heating field 9 by separating lines for generating parallel heating current paths 12 is known per se, for example, from the patents mentioned above, so that it need not be discussed further here.
  • the dividing lines 7, 30, in which the conductive coating 3 is in each case completely removed, can be produced, for example, by laser writing be incorporated into the conductive coating 3 by means of laser cutting robot. It should be noted that the in Fig. 1 shown layout of the second parting lines 30 is only an example and that equally differently extending Edelstrompfade 12 may be provided in the surface heating element 1.
  • a measuring current path 13 which is electrically insulated from the heating field 9, is formed in the conductive coating 3 in the form of a conductor track.
  • the measuring current path 13 is formed by the conductive material of the coating 3, for which purpose a boundary line circumscribing the measuring current path 13 is introduced into the edge strip 8, for example by means of lasering Fig. 1 the clarity is not shown in detail.
  • the measuring current path 13 is electrically divided from the remaining edge strip 8.
  • the measuring current path 13 extends a little along the lower long edge 6, the right short edge 5 adjoining thereto and the upper long edge 6 adjoining it approximately up to the height of a left heating field top 20 and on the opposite way back to a second terminal portion 15 at the level of the two terminal electrodes 10, 11, whereby a conductor loop is formed.
  • the two connection sections 14, 15 of the measuring current path 13 are electrically connected to connection lines 34 of an electrical measuring device 16. They may be provided for this purpose with electrically-galvanically coupled electrodes, which in Fig. 1 not shown in detail.
  • the measuring current path 13 with the intermediate measuring device 16 is short-circuited to a measuring circuit for measuring an electrical voltage or an electric current for determining the electrical resistance of the measuring current path 13.
  • the arrangement of the two connection sections 14, 15 on the substrate edge 4 allows a particularly simple contacting. It is understood that the exact course of the measuring current path 13 within the edge strip 8 can be made optional, so that the invention does not rely on the in Fig. 1 shown course is limited.
  • the measuring current path 13 here has, for example, a homogeneous cross-sectional area, which consists of a constant thickness (corresponding to one with a constant thickness on the Substrate 2 applied coating 3) and width of the conductor path transverse to its extension results. Accordingly, the measuring current path 13 has a substantially identical electrical resistance, so that a measuring voltage applied to the two connection sections 14, 15 drops at least approximately uniformly over the measuring current path 13.
  • the thickness of the conductor track which is perpendicular to the substrate 2 or substrate surface 42 and transverse to the direction of extent of the measuring current path 13 is, for example, in the range from 50 to 100 nanometers (nm).
  • the width of the conductor track which is dimensioned parallel to the substrate 2 or substrate surface 42 and transversely to the extent of the measuring current path 13 is, for example, in a range of more than 100 micrometers ( ⁇ m) and less than 5 millimeters (mm). Due to the relatively small width of the measuring current path 13, its electrical resistance is substantially greater than the electrical resistance of each Edelstrompfads 12 in the heating field 9.
  • the width of the Edelstrompfade 12 is for example more than 10 mm and is in particular 30 mm.
  • Fig. 8 Considering, for a surface heating element 1 with a glass substrate 2 and a transparent coating 3 based on the conductive material silver (Ag), the change in resistance of the coating 3 that accompanies a temperature change is illustrated by way of example.
  • the electrical resistance R (ohms) of the coating 3 is plotted over its temperature T (° C). It can be seen that there is an at least approximately linear relationship between the electrical resistance around the temperature T, so that an increase in the temperature of the coating 3 is always accompanied by an increase in the electrical resistance.
  • a temperature increase of 50 ° C increases the electrical resistance here, for example, by about 10 ohms, so that local or global temperature increases can be detected reliably and safely.
  • a localized overheating occurs in the heating field 9 near the upper long edge 6. This can happen, for example, that a towel or garment is hung over the upper long edge 6, whereby the dissipation of the heat generated in the heating field 9 is hindered to the environment.
  • the local temperature increase in the heating field 9 leads to an increase in temperature in a section of the hot spot adjacent to the hot spot.
  • the reason for this is the thermal coupling between the heating field 9 and the measuring current path 13, which is based predominantly on heat conduction of the substrate 2, and in a small proportion of radiant heat. As a result, the measuring current path 13 is heated, so that its electrical resistance increases.
  • This change in resistance can be detected by the measuring device 16, wherein even relatively small changes in resistance in the measuring current path 13 can be reliably and reliably measured with a good signal-to-noise ratio.
  • the measuring current path 13 is electrically insulated from the heating field 9, a measurement of the electrical resistance of the measuring current path 13 can take place independently of the heating current.
  • a glassy substrate 2 for example, is a rather poor heat conductor, the thermal coupling between the heating field 9 and the measuring current path 13 is relatively small, but in practice a significant increase in the resistance of the measuring current path 13 can also be achieved in this case be observed at least by him adjacent hot spots. It would be conceivable to provide an additional thermal coupling between the heating field 9 and the measuring current path 13 in the edge strip 8.
  • the heating field 9 and the edge strip 8 could be connected by a layer of electrically insulating material with good thermal conductivity, which is applied to the substrate 2 and is not removed when forming the first dividing line 7.
  • the measuring current path 13 can be assigned a zone 19, referred to below as a "detection zone", of the heating field 9, which is thermally coupled to the measuring current path 13 in such a way that a change in temperature causes a (significant) change in resistance Measuring current path 13 causes.
  • the respective size of the detection zone 19 depends on the thermal coupling between the heating field 9 and the measuring current path 13, wherein a better thermal coupling causes a larger detection zone 19 and vice versa.
  • the detection zone 19 extends over a portion of the heating field 9 adjacent to the measuring current path 13, wherein the detection zone 19 can also extend over the complete heating field 19 with correspondingly good thermal coupling.
  • these can be, for example, those areas of the heating field 9 in which, in all likelihood, hot spots occur due to incorrect operation.
  • the measuring device 16 may be coupled to a control and monitoring device 40 of the surface heating element 1 such that the supply voltage applied to the connection electrodes 10, 11 is switched off or at least reduced so much that further overheating is avoided.
  • the control and monitoring device 40 can be set up so that the supply voltage is switched off or at least reduced by a predetermined or predeterminable amount as soon as the increase in resistance in the measuring current path 13 exceeds an optionally predetermined or predeterminable threshold value.
  • a stepwise reduction of the supply voltage can be provided based on detected resistance values.
  • control and monitoring device 40 may be coupled to an optical and / or acoustic output device 41 so that a local overheating of the heating field 9 is displayed optically and / or acoustically. The user can then take appropriate measures such as a manual shutdown or reduction of the supply voltage of the surface heating element 1.
  • FIG. 2 taken, wherein a further embodiment of the surface heating element 1 according to the invention is illustrated. To avoid unnecessary repetition, only the differences from the embodiment of Fig. 1 explained and otherwise reference is made to the statements made there.
  • the surface heating element 1 comprises three measuring current paths 13, 13 ', 13 "incorporated in the conductive coating 3 in the form of strip conductors within the edge strip 8, which are each electrically insulated from the heating field 9.
  • the three conductor loops differ only in their respective course extends a first measuring current path 13, starting from a first terminal portion 14 at the level of the two terminal electrodes 10, 11 approximately to the height of the left Schufeldecks 20 and on the reverse Way back back to a second terminal portion 15 at the level of the two terminal electrodes 10, 11.
  • a second Meßstrompfad 13 'extends starting from a first terminal portion 14' at the level of the two terminal electrodes 10, 11, only a small piece along the upper long Rands 6 and back again in the opposite way.
  • the second measuring current path 13 uses part of the conductor track of the first measuring current paths 13, so that the first and second measuring current paths 13, 13' in particular share a common second connection section 15.
  • a third measuring current path 13 "extends, starting from a first connection section 14" at the level of the two connection electrodes 10, 11, along the lower long edge 6 and on a reversed path back to a second connection section 15 ".
  • the measuring current paths 13, 13 ', 13 are respectively short-circuited by the connection lines 34 of a separate measuring device 16 to a measuring circuit, which are designated here in this order as measuring circuits A, B and C. While the two measuring circuits A, B are for detecting a temperature-dependent Resistance change for detecting hot spots in the heating field 9, the measuring circuit C is used only as a reference circle. If the detection zones 19 of the measuring current paths 13, 13 ', 13 "cover only a portion of the Schufelds 9, can by the two measuring circuits A and B a spatially resolved detection of hot spots, wherein the spatial proximity of a hot spot to the measuring circuit A or B is detectable.
  • the measuring circuit C is associated with a detection zone 19, in which at least in certain applications in practice (eg space heating) no hot spots should occur.
  • a reference signal dependent on the instantaneous temperature of the heating field 9 can be generated by the measuring circuit C, which enables a reliable and reliable determination of hot spots on the basis of a change in the resistance of the measuring circuits A and B.
  • the surface heater 1 of Fig. 2 thus allows a particularly reliable, spatially resolved detection of hot spots. It is understood that in Fig. 2 illustrated measuring devices 16 may equally be realized by a single measuring device 16.
  • FIG. 3 taken, wherein a further embodiment of the surface heating element 1 according to the invention is illustrated. To avoid unnecessary repetition, only the differences to those in Fig. 2 shown embodiment explained and otherwise reference is made to the statements made there.
  • the surface heating element 1 comprises three measuring current paths 13, 13 ', 13 "formed as conductor tracks in the conductive coating 3 within the marginal strip 8, which are each electrically insulated from the heating field 9.
  • the three measuring current paths 13, 13', 13" have a different course as in Fig. 2 and are used without reference circle exclusively for detecting hot spots 17, one of which is shown by way of example.
  • the first measuring current path 13, which belongs to measuring circuit A, extends analogously to Fig. 2 , starting from a first connection section 14 at the height of the two connection electrodes 10, 11, approximately up to the height of the left Bankfeldecks 20 and on the opposite way back to a second connection section 15 at the level of the two connection electrodes 10, 11.
  • the second measuring current path thirteenth ' which belongs to measuring circle B, extends, starting from a first connection section 14' at the level of the two connection electrodes 10, 11, approximately to the middle of the upper long edge 6 and in the opposite way back again.
  • the second measuring current path 13 ' uses part of the conductor track of the first measuring current path 13, so that the first and second measuring current paths 13, 13' in particular share a common second connection section 15.
  • the third measuring current path 13 "extends, starting from a first connection section 14" at the level of the two connection electrodes 10, 11, along the right short edge 5 and on the opposite way back again.
  • the third measuring current path 13 "utilizes part of the common conductor track of the first and second measuring current paths 13, 13 ', so that the first, second and third measuring current paths 13, 13', 13" in particular use a common second connection section 15
  • Measuring circuits 13, 13 ', 13 "associated detection zones 19 each cover only a portion of the heating field 9, the measurement circuits A, B, C allow a spatially resolved detection of hot spots 17, wherein the spatial proximity of a hot spot 17 to the measuring circuit A, B or C is detectable Fig. 3 hot spot 17 illustrated by way of example in the region of the upper long edge 6 has the greatest spatial proximity to the first measuring current path 13 or measuring circuit A and therefore causes there a strongest temperature rise and thus a greatest change in the electrical resistance. Since the hot spot 17 in the measuring circuits B and C no correspondingly large change in resistance caused, the spatial position of the hot spot 17 can be clearly assigned to the detection zone 19 of the measuring circuit A.
  • FIG. 4 taken, wherein a further embodiment of the surface heating element 1 according to the invention is illustrated. Again, to avoid unnecessary repetition, only the differences to those in Fig. 3 illustrated embodiment and otherwise reference is made to the statements made there.
  • the surface heating element 1 comprises a plurality of unspecified measuring current paths within the edge strip 8, which are each electrically insulated from the heating field 9 and the measuring circuits A, B, C, etc. result.
  • Each measuring current path comprises a spatially limited zone 18, hereinafter referred to as "measuring zone” in which the conductor changes its course direction several times (ie has a plurality of oppositely curved conductor track sections), wherein the conductor track sections within the measuring zone 18 with close spacing are close together.
  • the measuring current paths have, for example, a meandering curved course in the schematically illustrated measuring zones 18. As in Fig.
  • each measuring current path is connected to an adjacent Meßstrompfad (measuring circuit).
  • the measuring zones 18 of the various measuring circuits A, B, C, etc. are spatially separated from each other and distributed with approximately equal intervals along the upper long edge 6 and right short edge 5. Since the measuring voltage drops predominantly in the region of the measuring zones 18, the detection zones 19 of the measuring circuits A, B, C, etc. can each be assigned to the measuring zones 18, so that a spatially resolved detection of hot spots is possible, wherein the spatial proximity of a hot spot to the Measuring zone 18 of a measuring circuit A, B, C, etc. is detectable.
  • a hot spot 17 is shown, which is located in the vicinity of the two measuring zones 18 of the measuring circuits A and B.
  • the hot spot 17 will cause a strongest temperature increase or increase in resistance in the measuring zone 18 of the measuring circuit A and subordinate in the measuring zone 18 of the measuring circuit B.
  • the surface heater 1 of Fig. 4 thus enables a highly sensitive and particularly accurate spatially resolved detection of hot spots 17 by the distributed measuring zones 18 of the various measuring circuits.
  • FIG. 5 taken, wherein a further embodiment of the surface heating element 1 according to the invention is illustrated. To avoid unnecessary repetition, again only the differences to those in the FIGS. 1 to 4 illustrated embodiments and otherwise reference is made to the statements made there.
  • the surface heater 1 of Fig. 5 differs from the previous embodiments by the partial course of Meßstrompfaden 13 within the Schufelds 9, as well as their contacting. These are analogous to Fig. 2 two measuring circuits A and B, and a reference circle C provided.
  • a first measuring current path 13 uses a path section of a heating current path 12, which is, for example, a heating current path 12 adjoining the first dividing line 7.
  • the first measuring current path 13 extends within the heating field 9 from the first connection electrode 10 (in FIG Fig. 5 left terminal electrode), which serves here as a first terminal portion 14, along the lower short edge 5 and the adjoining left long edge 6.
  • the Bankstrompfad 12 changes in its course along the left long edge 6 several times in opposite directions its direction.
  • the first measuring current path 13 extends as a conductor track incorporated in the coating 3 along the upper long edge 6 and the adjoining short edge 5, and a short distance along the lower long edge 6, where it reaches the second connection electrode 11 (FIG. in Fig. 5 right connection electrode) ends in a second connection section 15.
  • the two connecting lines 34 with the intermediate measuring device 16 contact the first connecting electrode 10 and the second connecting section 15 of the first measuring current path 13 for forming the measuring circuit A.
  • the first measuring current path 13 thus comprises a heating field section 22 located in the heating field 9 and an edge strip section 23 located in the edge strip 8 ,
  • a second measuring current path 13 ' likewise runs partially in the heating field 9 and uses a different section of the same heating current path 12 as the first measuring current path 13.
  • the second measuring current path 13' extends from the second connection electrode 11 (in FIG Fig. 5 right connection electrode) in the heating current path 12 for a short distance along the lower long edge 6 and the right short edge 5 adjacent thereto.
  • the second measuring current path 13 ' leaves the heating field 9, merges into the edge strip 8 and continues from there completely within the edge strip 8.
  • the second parting line 7, by which the edge strip 8 is electrically separated from the heating field 9, is not formed for this purpose there.
  • the second measuring current path 13 ' extends as in the coating 3 molded conductor along the right short edge 5, and a short distance along the lower long edge 6, where it ends at the level of the second connection electrode 11 in a second connection portion 15' .
  • the two connection lines 34 with the intermediate measuring device 16 contact the second connection electrode 11 and the second connection section 15 'of the second measuring current path 13' for forming the measuring circuit B.
  • the second measuring current path 13 'thus likewise includes a heating field section 22 located in the heating field 9 and one in the edge strip 8 located edge strip section 23rd
  • the electrical resistance within the heater 9 is substantially smaller than in the edge strip 8.
  • the width or cross-sectional area each of the first and second measuring current paths 13, 13 'within the heating field for example, 2 to 100 times, in particular 85 times, the width or cross-sectional area in the edge strip 8. It is understood that the width within the heating field 9 from Layout of Edelstrompfade 12 depends and can vary widely.
  • the measurement voltage for measuring a change in resistance drops substantially over the edge strip portions 23.
  • the detection zones 19 of the two measuring current paths 13, 13 'can thus be assigned to the edge strip sections 23.
  • a spatially resolved detection of hot spots in the heating field 9 by the edge strip portions 23 of the two measuring current paths 13, 13 ' is possible.
  • a particular advantage of this embodiment is that the conductor tracks of the measuring circuits A and B respectively require only relatively little space in the edge strip 8, so that the measuring circuits A, B can also be formed with narrow edge strips 8.
  • a measurement of the electrical resistance in the measuring circuits A, B can be carried out simultaneously for feeding heating current through a potential difference between measuring and supply voltage.
  • Analogous to Fig. 2 serves a third Meßstrompfad 13 "for forming a measuring circuit C.
  • the third Meßstrompfad 13" extending from a first terminal portion 14 "at the level of the two terminal electrodes 10, 11 in the form of a built-in coating 3 conductor along the lower long edge 6 and of the upper long edge 6 adjoining thereto and runs back in the opposite direction, for which purpose the interconnect incorporated into the coating 3 in the area of the left heater top 20 merges into the edge strip section 23 of the first measuring current path 13.
  • a connecting line 34 of the measuring device 16 contacts the first connection section 14 "of the third measurement current path 13", the other connection line 34 connected to the first connection electrode 10 connecting line 34 of the measuring circuit A.
  • the measuring circuit C is used only as a reference circle and allows determination of hot spots on the basis of one of the current temperature of the heating f elds 9 dependent reference signal, so that a particularly reliable and secure detection of hot spots is possible.
  • FIG. 6 taken, wherein a further embodiment of the surface heating element 1 according to the invention is illustrated. Again, to avoid unnecessary repetition, only the differences to that are shown Fig. 5 illustrated embodiment and otherwise reference is made to the statements made there.
  • the surface heater 1 of Fig. 6 differs from the surface radiator of Fig. 5 only in that the edge strip portion 23 of the first measuring current path 13 in the region of the upper long edge 6 several times its course in opposite directions (oppositely curved Meßstrompfadabitese) changes and here, for example, has a meandering curved course.
  • the measuring voltage is substantially adjacent to that at the upper long edge 6 Edge strip portion 23 drops, so that the sensitivity and spatial resolution for detecting hot spots is increased in this area.
  • the surface heater 1 differs from the in the FIGS. 1 to 6 Illustrated surface radiators 1 by the virtually complete course of Meßstrompfaden within the heating field 9, as well as by contacting the measuring current paths.
  • four measuring circuits A, B, C and D are formed, as will be explained in more detail below.
  • Fig. 7A Be first Fig. 7A considered, wherein the layout of the surface heater 1 is shown. Accordingly, the surface heater 1 here, for example, a mirror-symmetrical structure with respect to an axis of symmetry 27, which extends centrally of the two short edges 5.
  • the two connection electrodes 10, 11 are each divided into three electrically insulated first to third electrode sections 24-26, the three electrode sections 24-26 of a same connection electrode 10, 11 are electrically connected to each other in a plane other than the coating 3 (which not shown in detail).
  • the two connection electrodes 10, 11 are in Fig. 7A also shown in an enlarged view.
  • measuring current paths 13, 13 ', 13 ", 13"' formed, each consisting of a path portion of a Schustrompfads 12, 12 'and a much narrower, incorporated into the conductive coating 3 of the heating field 9 conductor, hereinafter referred to as "measuring current "labeled, put together.
  • the surface heating element 1 comprises for this purpose on each side of the symmetry axis 27 each two measuring current paths, namely a first measuring flow path 28 and a second measuring flow path 29, and a third measuring flow path 35 and a fourth measuring flow path 36, each by third dividing lines 37 in the conductive Coating 3 are formed for example by means of laser.
  • the measuring current paths 28, 29, 35, 36 have a (eg significantly) smaller width or cross-sectional area compared to the heating current paths 12, which is accompanied by a correspondingly greater electrical resistance, so that the measuring current paths 13, 13 ', 13 ", 13 “', the measuring voltage substantially above the measuring current paths 28, 29, 35, 36 drops.
  • the first measuring flow path 28 extend and the third measuring flow path 35 each in the heating field 9 between a first heating current path 12, which adjoins the first dividing line 7, and an adjacent, inner second heating current path 12 'up to a (common) first Meßstrombahnende 38 approximately at the central height of the left short substrate edge 5.
  • the first measuring current path 28 extends in the region of the second connection electrode 11 in a second electrode gap 32 between the first electrode portion 24 and the second electrode portion 25 of the second connection electrode 11 and then merges into a first electrode gap 31 between the two connection electrodes 10, 11 until it runs out in a separate first pad 44.
  • the first measuring current path 28 is electrically connected to the part of the first heating current path 12 situated below the axis of symmetry 27.
  • the third measuring current path 35 extends in the region of the first connection electrode 10 in a second electrode gap 32 between the first electrode section 24 and the second electrode section 25 of the first connection electrode 10 and then passes into the first electrode gap 31 between the two connection electrodes 10, 11, where they expires in a third pad 46.
  • the third measuring current path 35 is electrically connected to the part of the first heating current path 12 located above the axis of symmetry 27.
  • the first measuring flow path 28 and the third measuring flow path 35 are electrically separated from the first and second heating current paths 12, 12 '.
  • the second measuring flow path 29 and the fourth measuring flow path 36 which lie further in each case, extend in the heating field 9 between the second heating current path 12 'and an adjacent third heating current path 12 "up to a respective second measuring flow path end 43.
  • the second measuring flow path 29 extends in the region of the second terminal electrode 11 in a third electrode gap 33 between the second electrode portion 25 and the third electrode portion 26 of the second terminal electrode 11 and then passes into the first electrode gap 31 between the two terminal electrodes 10, 11 where it terminates in a second pad 45
  • the second measuring current path 29 is electrically connected to the second heating current path 12 'in the second measuring current path end 43.
  • the fourth measuring current path 36 extends in the region of the first connecting electrode 10 in a third electrode gap 33 between the second electrode section 25 and the third th Electrode portion 26 of the first terminal electrode 10 and then passes into the first electrode gap 31 between the two terminal electrodes 10, 11, where it terminates in a fourth pad 47.
  • the fourth measuring flow path 36 is electrically connected to the second heating current path 12 '.
  • the second measuring flow path 29 and the fourth measuring flow path 36 are electrically separated from the first and second heating current paths 12, 12 '.
  • the first measuring current path 13 corresponding to the measuring circuit A, is connected in series with a second measuring current path 13 ', corresponding to the measuring circuit B.
  • the first measuring current path 13 extends, starting from the first electrode section 24 of the second connecting electrode 11 in the first heating current path 12, to the first measuring current end 38, where it merges into the third measuring current path 35.
  • the third measuring current path 35 is short-circuited to the second measuring current path 29, which is part of the second measuring current path 13 '.
  • the third pad 46 and the second pad 45 are electrically connected to each other (which is not shown in detail). These two connection pads 45, 46 together form a first connection section 14.
  • the second measurement current path 13 merges at the associated second measuring flow path end 43 into the second heating current path 12', which is electrically connected to the second electrode section 25 of the first connection electrode 10.
  • the third measuring current path 13 " corresponding to the measuring circuit C, is connected in series with a fourth measuring current path 13"', corresponding to the measuring circuit D.
  • the third measuring current path 13 extendends, starting from the second electrode section 25 of the second connection electrode 11 in the second heating current path 12 'to the associated second measuring flow path end 43, where it merges into the fourth measuring flow path 36.
  • the fourth measuring flow path 36 is short-circuited with the first measuring flow path 28, which is part of the fourth measuring current path 13 "'.
  • the fourth pad 47 and the first pad 44 are electrically connected. These two connection pads 44, 47 together form a second connection section 15.
  • the fourth measurement current path 13 "'changes into the first heating current path 12, which is electrically connected to the first electrode section 24 of the first connection electrode 10.
  • resistor R1 corresponds to measuring circuit A
  • resistor R2 to measuring circuit B
  • resistor R3 to measuring circuit C
  • resistor R4 to measuring circuit D
  • First electrode 10 is connected, for example, to the negative pole of a voltage source and second electrode 11 to the positive pole of the voltage source.
  • a measuring device 16 for determining electrical voltage changes is electrically connected to a node between the two resistors R1 and R2 and another node between the two resistors R3 and R4, so that there is a Wheatstone bridge circuit. These two nodes correspond to the two connection sections 14, 15, which result from an electrical connection of the second and third connection pads 45, 46 and of the first and fourth connection pads 44, 47, respectively.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Surface Heating Bodies (AREA)
  • Resistance Heating (AREA)
  • Control Of Resistance Heating (AREA)
EP11805429.5A 2010-11-18 2011-11-18 Flächenheizkörper mit temperaturüberwachung Active EP2641452B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP11805429.5A EP2641452B1 (de) 2010-11-18 2011-11-18 Flächenheizkörper mit temperaturüberwachung

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP10191723 2010-11-18
EP11805429.5A EP2641452B1 (de) 2010-11-18 2011-11-18 Flächenheizkörper mit temperaturüberwachung
PCT/EP2011/070426 WO2012066112A1 (de) 2010-11-18 2011-11-18 Flächenheizkörper mit temperaturüberwachung

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EP2641452A1 EP2641452A1 (de) 2013-09-25
EP2641452B1 true EP2641452B1 (de) 2016-06-01

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EP (1) EP2641452B1 (ko)
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KR (1) KR101520201B1 (ko)
CN (1) CN103202095B (ko)
EA (1) EA030260B1 (ko)
ES (1) ES2591136T3 (ko)
PL (1) PL2641452T3 (ko)
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CN103202095B (zh) 2016-06-15
PT2641452T (pt) 2016-09-07
US9900932B2 (en) 2018-02-20
ES2591136T3 (es) 2016-11-25
CN103202095A (zh) 2013-07-10
US20130277352A1 (en) 2013-10-24
EP2641452A1 (de) 2013-09-25
WO2012066112A1 (de) 2012-05-24
EA201390728A1 (ru) 2013-09-30
JP5808419B2 (ja) 2015-11-10
JP2014502408A (ja) 2014-01-30
PL2641452T3 (pl) 2016-11-30
KR101520201B1 (ko) 2015-05-13
EA030260B1 (ru) 2018-07-31
KR20130112907A (ko) 2013-10-14

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