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
  • H05B3/00—Ohmic-resistance heating
  • H05B3/68—Heating arrangements specially adapted for cooking plates or analogous hot-plates
  • H05B3/74—Non-metallic plates, e.g. vitroceramic, ceramic or glassceramic hobs, also including power or control circuits
  • H05B3/748—Resistive heating elements, i.e. heating elements exposed to the air, e.g. coil wire heater
• • 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
  • H05B3/68—Heating arrangements specially adapted for cooking plates or analogous hot-plates
• • 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
  • H05B3/68—Heating arrangements specially adapted for cooking plates or analogous hot-plates
  • H05B3/72—Plates of sheet metal
• • 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
  • H05B3/68—Heating arrangements specially adapted for cooking plates or analogous hot-plates
  • H05B3/74—Non-metallic plates, e.g. vitroceramic, ceramic or glassceramic hobs, also including power or control circuits
• • 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
  • H05B3/68—Heating arrangements specially adapted for cooking plates or analogous hot-plates
  • H05B3/74—Non-metallic plates, e.g. vitroceramic, ceramic or glassceramic hobs, also including power or control circuits
  • H05B3/746—Protection, e.g. overheat cutoff, hot plate indicator

Definitions

• the invention relates to a ceramic hob with a glass ceramic plate, which carries heating elements for direct heating on its underside, separated by an insulating layer, the cooking zone being subdivided into at least one inner and one outer zone, which carry zone-specific heating elements which are dependent on a controller the temperature values detected by the temperature sensors assigned to the subzones can be switched and / or their output can be regulated.
• a ceramic hob is known from DE 41 30 337 A1.
• the sub-zones each have a meander-shaped heating conductor, in the vicinity of which a similarly designed sensor path for temperature detection runs. In this embodiment, the heating conductors and the sensor tracks are applied to an insulation layer covering the entire cooking zone.
• a ceramic hob has the same disadvantages if the heating elements are aligned in a radial manner with respect to the center of the cooking zone and extend over sector-shaped partial zones.
• the construction and application of the heating elements is difficult even if concentric, circular conductor tracks are applied to the underside of the glass ceramic plate, which extend almost 360 ° over the circumference of the partial zones.
• the glass ceramic plate forms a parallel connection of many temperature-dependent differential resistors between two conductor tracks, as shown in DE 40 22 846 A1.
• the large number of resistors can also be realized by means of many strip-shaped conductor tracks, the ends of which are connected in parallel, such as the EP 0 315 079 B1 (DE 38 84 569 T2) shows. With this design of the hob, however, no individually switchable and controllable subzones are formed.
• the inner partial zone and the outer partial zone are formed from conductor tracks arranged concentrically to one another in a circular arc, which only leave one connection sector reaching to the center of the cooking zone, in that the conductor tracks in the connection sector by means of connecting pieces one behind the other that the start of the innermost interconnect and the end of the outermost interconnect as well as a connector that divides the sub-zone-specific heating elements into the connection sector can be controlled by means of connections, that the insulation layer is arranged at least under the interconnects and that at least the inner one Subzone a temperature sensor and the outer subzone distributed over the circumference are assigned several temperature sensors or that the inner subzone and the outer subzone consist of two concentric annular surface heating elements Are formed which leave only one connection sector reaching to the center of the cooking zone, that in the connection sector by means of connections, the two ends of the surface heating elements are switched on together and the beginnings of the two surface heating elements are switched on individually, that the insulation layer is arranged at least under the surface heating elements and that the
• the conductor tracks or the surface heating elements with the same partial insulation layers form elements that are easy to apply in terms of production technology and leave areas where temperature sensors can be applied directly to the underside of the glass ceramic plate.
• the heating elements extend over the largest part of the area of the assigned sub-zones and ensure an optimal and uniform heating of these sub-areas, which leads to a high efficiency of the hob, since in addition the temperatures of the sub-areas are measured independently of one another and for switching and regulating Heating power can be used.
• the temperature sensors can, however, also be applied to thin insulation layers that cover the glass ceramic plate outside the heating elements. If the temperature sensors are housed in insulating protective covers, they can also be applied to the heating elements.
• connection sector can be kept narrow in that the connections in the connection sector extend beyond the outer sub-zone. Outside the cooking zone, there is more space for the connection contacts and the connection lines.
• the temperature of the inner sub-zone of the cooking zone is monitored in that the temperature sensor in the center of the cooking zone is designed as a rod sensor or point sensor and its connection leads beyond the connection sector beyond the cooking zone.
• the heating elements are provided such that the conductor tracks consist of NiCr, NiAl or cermets alloys and are applied by thermal spraying, while heating foils, NiCr, NiAl or cermets layers are used as surface heating elements on the Insulation partial layers are applied.
• the conductor tracks and the surface heating elements can also be applied as silver-containing tracks or layers by means of screen printing. They can also be applied with carbon pastes.
• Fig. 1 is a ceramic hob with inner and outer subzone and conductor tracks as heating elements and
• Fig. 2 is a ceramic hob with inner and outer sub-zone and surface heating elements as heating elements.
• a glass ceramic plate 10 is shown seen on the underside 11.
• a round cooking zone is marked on the top in a known manner.
• a number of circular-shaped conductor tracks 15 are applied to insulating partial layers 12 of the same surface area. These conductor tracks 15 extend over almost 360 ° of the circumference of the cooking zone and leave only a narrow connecting sector 16 free, which extends to the center of the cooking zone. zone extends.
• the partial insulation layers 12 have a high electrical insulation resistance, ie a high dielectric strength. They are designed as thin insulation conductors with a small heat transfer resistance.
• connection sector 16 In the area of the connection sector 16, the conductor tracks 15 are connected in series by means of connecting pieces 17, so that a heating coil with an alternating direction of rotation of the turns is created.
• connection sector 16 a connection aO is led to the start A of the innermost conductor track 15.
• a connection a1 is connected in the connection sector 16 to a connecting piece 17, so that the heating coil is divided into a heating element H1 and a heating element H2.
• These heating elements H1 and H2 are then assigned to an inner sub-zone Wi and an outer sub-zone Wa.
• connection a2 is switched on at the end E of the outermost conductor track 15, so that the two heating elements H1 and H2 can be controlled independently of one another and the heating power can be regulated.
• a control ST connected to the mains voltage L, N is provided, to which the connections aO, a1 and a2 are connected.
• the control ST is supplied with the temperatures of the areas of the glass ceramic plate 10 as detected by the temperature sensors So, S1, S2, S3 and S4 via the connections So, S1, S2, S3 and S4.
• the temperature sensor So is connected in the center of the inner sub-zone Wi, ie inside the conductor track 15, directly to the underside 11 of the glass ceramic plate 10 and directly detects the temperature of the glass ceramic plate 10 at the connection point without being affected by an insulation layer 12. If the temperature sensor is metallic, is outside the heating elements have a thin insulation layer to avoid short circuits.
• connection contacts that are outside the round cooking zone and find sufficient space there.
• the heating lines ho, hi and h2 from the control ST can therefore be easily connected to the connection contacts aO, a1 and a2.
• connection sector 16 can be kept narrow, so that the circular arc-shaped conductor tracks 15 arranged concentrically to one another can extend over a maximum portion of the circumference and cover the cooking zone over a large area. This ensures uniform heating of the sub-zones Wi and Wa with good efficiency.
• the partial insulation layers 12 can be applied in the same arrangement with the same area on the underside 11 of the glass ceramic plate 10, so that outside the conductor tracks 15 the underside 11 of the glass ceramic plate 10 for direct connection to the temperature sensors So, S1, S2, S3 and S4 is accessible and that the temperature sensors can carry out the temperature measurement without being impaired by an insulation layer 12.
• these areas of the underside of the glass ceramic plate 10 can also be covered with thinner insulation layers if metallic temperature sensors are used.
• an annular heating foil 15i forms the heating element H1 assigned to the inner partial zone Wi and the annular heating foil 15a forms the outer partial zone Wa.
• the connecting contacts aO, a1 and a2 in the connecting sector 16 switch the heating elements H1 and H2 in opposite directions one behind the other.
• the heating foil 15i has a central recess 20 in which a rod sensor or Point sensor designed temperature sensor is arranged in this way and with its connection via the connection sector 1 6, as the connection contacts aO, a1 and a2 are led out of the cooking zone and, as in the exemplary embodiment according to FIG. 1, are connected to a control ST.
• the two sub-zones Wi and Wa of the cooking zone can therefore be switched as a function of assigned temperatures and / or regulated in the heating power.
• the heating foils 15i and 15a occupy the vast majority of the cooking zone, so that the sub-zones Wi and Wa can be heated uniformly, depending on the temperature sensors So and S1, S2, S3 and S4 recorded temperatures. Temperature sensors S1 to S4 ensure that temperature differences across the circumference of the cooking zone edge can be recorded and taken into account for the outer sub-zone Wa.
• connection contact aO connects the two heating foils 15i and 15a on one side of the connection sector 16 as a tap for dividing the heating element into the partial heating elements H1 and H2.
• the construction of the cooking zone with the two heating foils 15i and 15a is simple and easy to apply.
• the surface heating elements can also be applied in a similar manner to the conductor tracks 15 in FIG. 1, for which purpose NiCr, NiAI alloys, cermets, silver-containing layers or applications made of carbon pastes are used.

Landscapes

• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Ceramic Engineering (AREA)
• Resistance Heating (AREA)
• Control Of Resistance Heating (AREA)
• Surface Heating Bodies (AREA)
• Electric Stoves And Ranges (AREA)
• Cookers (AREA)
• Baking, Grill, Roasting (AREA)

Applications Claiming Priority (3)

Publications (2)

Family

ID=7677100

Family Applications (1)

Country Status (8)

Families Citing this family (16)

Family Cites Families (16)

• 2001
  • 2001-03-06 DE DE10111734A patent/DE10111734A1/de not_active Ceased
• 2002
  • 2002-03-05 DE DE50203197T patent/DE50203197D1/de not_active Expired - Fee Related
  • 2002-03-05 ES ES02748333T patent/ES2243742T3/es not_active Expired - Lifetime
  • 2002-03-05 AT AT02748333T patent/ATE296527T1/de not_active IP Right Cessation
  • 2002-03-05 EP EP02748333A patent/EP1368994B1/fr not_active Expired - Lifetime
  • 2002-03-05 CA CA002439606A patent/CA2439606A1/fr not_active Abandoned
  • 2002-03-05 US US10/471,130 patent/US20040074893A1/en not_active Abandoned
  • 2002-03-05 WO PCT/EP2002/002401 patent/WO2002071806A1/fr not_active Application Discontinuation
  • 2002-03-05 CN CNA028042778A patent/CN1489882A/zh active Pending

Non-Patent Citations (1)

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