WO2008110450A2 - Kochfeld und verfahren zum detektieren eines kochgeschirrteils - Google Patents
Kochfeld und verfahren zum detektieren eines kochgeschirrteils Download PDFInfo
- Publication number
- WO2008110450A2 WO2008110450A2 PCT/EP2008/052268 EP2008052268W WO2008110450A2 WO 2008110450 A2 WO2008110450 A2 WO 2008110450A2 EP 2008052268 W EP2008052268 W EP 2008052268W WO 2008110450 A2 WO2008110450 A2 WO 2008110450A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- hob
- switch
- cookware
- cooking
- cookware part
- Prior art date
Links
- 238000010411 cooking Methods 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 title claims description 9
- 230000005291 magnetic effect Effects 0.000 claims abstract description 36
- 230000003213 activating effect Effects 0.000 claims abstract description 5
- 238000010438 heat treatment Methods 0.000 claims description 45
- 235000014676 Phragmites communis Nutrition 0.000 claims description 12
- 230000006698 induction Effects 0.000 claims description 11
- 230000003993 interaction Effects 0.000 claims description 11
- 230000005294 ferromagnetic effect Effects 0.000 claims description 9
- 230000005292 diamagnetic effect Effects 0.000 claims description 4
- 239000002241 glass-ceramic Substances 0.000 claims description 3
- 230000001681 protective effect Effects 0.000 claims 1
- 210000002105 tongue Anatomy 0.000 description 17
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 239000000919 ceramic Substances 0.000 description 4
- 239000011521 glass Substances 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 239000003302 ferromagnetic material Substances 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 229910000510 noble metal Inorganic materials 0.000 description 2
- 230000005298 paramagnetic effect Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 244000089486 Phragmites australis subsp australis Species 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 239000010970 precious metal Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000000284 resting effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
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
- H05B3/746—Protection, e.g. overheat cutoff, hot plate indicator
-
- 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
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
- H05B6/12—Cooking devices
-
- 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
- H05B3/683—Plates having their feeding circuit closed as the kettles, pans or the like are put on
-
- 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
- H05B3/685—Plates having magnetic means attracting the kettles, pans, or the like
-
- 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
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/06—Control, e.g. of temperature, of power
- H05B6/062—Control, e.g. of temperature, of power for cooking plates or the like
-
- 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
- H05B2213/00—Aspects relating both to resistive heating and to induction heating, covered by H05B3/00 and H05B6/00
- H05B2213/05—Heating plates with pan detection means
Definitions
- the invention relates to a hob according to the preamble of claim 1, a cookware part according to the preamble of claim 1 1 and a method for detecting a cookware part according to the preamble of claim 12.
- a hob with a ceramic cooking surface and four heating zones for setting up each a cookware part is known.
- the hob also includes a switch disposed beneath the ceramic cooking surface for activating at least one function of the hob, the switch being actuatable by a magnetic force.
- the switch is a power disconnect switch that disconnects a control unit or a transformer located between the control unit and the power grid from the power grid.
- the mains disconnect switch is arranged in an edge region of the cooktop and designed as a reed switch. The switching of the reed switch takes place via a magnet arranged above the reed switch on the ceramic cooking surface.
- the object of the invention is in particular to make available a magnetic interaction between a set up on a hob surface cookware part and actuated by the magnetic force switch.
- the invention relates to a hob with a hob surface, in particular a glass or ceramic cooking surface, with a arranged below the hob surface switch for activating at least one function of the hob, wherein the switch can be actuated by a magnetic force.
- the switch is designed to interact magnetically with a cookware part arranged on the hob surface.
- the switch with a ferromagnetic or permanent nentmagnetician pot bottom of the cookware part interact and this interaction can be used to automatically trigger a switching process.
- the switch for producing and disconnecting a network connection of a control unit of the hob can be used. Standby mode can be achieved without any energy consumption.
- the switch when setting up the cookware part can also be opened and / or generate a current pulse that can trigger a switching process.
- the hob when the switch is disposed below a heating zone of the cooking surface, the hob can be activated without any further operator intervention by the mere placement of the cookware part.
- the switch can be used to activate and / or deactivate any conceivable function of the hob or a control unit of the hob.
- the switch activates or deactivates a standby function.
- the standby function is activated, i. the operator can turn on or power a heating zone by operating suitable selector switches.
- the control unit is completely turned off and can not receive signals from the selector switches.
- the selector switches can be designed, for example, as touch-sensitive switching elements.
- heating zone encompasses all areas of the hob on which cooking utensil parts or their bottoms can be placed.
- the switch is in particular designed to interact with a cookware element arranged on the hob surface when it is connected to such a cookware element. which preferably has a ferromagnetic or permanent magnetic bottom, which is located on the heating zone, magnetically interacts such that sufficient to actuate or influence the switch sufficient magnetic force is generated.
- a single switch can be used to detect cookware parts on several heating zones when the switch is arranged between at least two heating zones.
- a particularly power-saving off-state of the hob which is also a standby state, can be achieved when a control unit of the hob is connected via the switch to a power supply.
- a periodic polling of the state of the switch can be avoided, thereby saving power costs.
- a lower power consumption can be achieved because such cooktops permanently magnetic fields in the coil must generate, which is associated with radiation losses.
- the hob is designed as an induction hob, i. it includes at least one arranged below the heating zone induction heating.
- induction cooktops occur, however, especially below the cooking surface significantly lower temperatures.
- simple permanent magnets can be used to generate the magnetic force, which are never heated beyond their Curie temperature.
- the switch can be safely triggered by any ferromagnetic element. If the switch is very sensitive, triggering the switch would also be kung of the permanent magnet with a paramagnetic element, such as a paramagnetic cookware, conceivable.
- a permanent magnet may be arranged in a cookware part.
- the switch is arranged in an outer shell filled with shielding gas.
- the outer shell is best formed from a diamagnetic substance, such as glass.
- reed relays can be used.
- a reed relay is a relay for switching a circuit that works with a reed contact.
- Reed switching contacts are sealed under vacuum or inert gas in a glass envelope reeds, which also form the contact spring and the armature.
- the contact tongues are therefore made of noble metal-coated ferromagnetic material (e.g., soft iron).
- the contact operation is carried out by an externally applied magnetic field, which is generated by a nearby brought permanent magnet or in an associated magnetic coil electrically.
- the switch is designed as a changeover switch.
- the magnetic interaction between an element located above the hob surface and the switch is not shielded by the hob surface when the hob surface is made of diamagnetic glass ceramic.
- the switch comprises a resilient tongue with a arranged in the region of the free end of the switching tongue permanent magnet.
- This makes it possible to dispense with a permanent magnet in the cookware parts, which ultimately all cookware parts, ie in particular pots and pans, can be used for cooking on the hob according to the invention.
- the invention also relates to a cookware part, in particular a saucepan, a pan or a roasting pan, which has a bottom for placement on a hob.
- the base comprises a permanent magnet.
- the invention relates to a method for detecting a cookware part on a hob.
- a state of a magnetic force actuated switch below the hob is used as a parameter for the presence of the cookware part.
- the magnetic force is thus utilized for the detection of the cookware part and in a resting state, a significant energy saving can be realized in comparison to other methods for detecting a cookware part using induction coils.
- Fig. 1 is a schematic representation of a section of a hob before setting up a cookware
- Fig. 2 shows the detail of the hob of Figure 1 after setting up a
- FIG. 3 shows a hob with a cookware part according to an alternative embodiment of the invention
- FIG. 4 is a cooking field with four each one arranged in the center of a heating zone switches in a plan view 5 shows a hob arranged with four each at the edge of a heating zone
- FIG. 6 shows a hob according to an alternative embodiment of the invention with a switch arranged between four heating zones in a plan view.
- FIG. 1 schematically shows a section of a hob with a rectangular and flat hob surface 10 made of diamagnetic glass ceramic with a plurality of heating zones 12 for setting up a cookware part 18.
- the heating zones 12 are characterized by induction heating elements 14 arranged below the heating zones 12, which are shown only schematically here , In Figure 1 and below, only one of the heating zones 12 is shown and described to avoid repetition.
- the further heating zones 12 differ from the heating zone 12 shown in FIG. 1 only in their size and in the maximum output of the induction heating element 14 arranged below the heating zone 12.
- the hob also includes, beneath each of the heating zones 12, a switch 16 disposed below the hob surface 10 for activating at least one function of the hob.
- the switch 16 is actuated by a magnetic force, which will be explained in more detail below.
- the switches 16 of the different heating zones 12 are connected in parallel and are connected so that a network connection of a control unit not explicitly shown here can be opened and closed by the switches 16, so that the control unit of the hob is connected via the switch 16 to a power supply.
- the control unit automatically switches to a standby state when connected to the power supply. This happens as soon as one of the switches 16 is closed.
- the user recognizes the standby state in that when the standby state is switched on, a warning light is switched on which can be actuated directly via the switch 16.
- a transformer which converts a mains voltage into a voltage that can be used by the control unit, can in principle be arranged before or after the switch 16. No-load losses can be avoided if the transformer is arranged after the switch 16, ie between the switch 16 and the control unit.
- the switch 16 is provided by its structure described below to be opened or closed by a magnetic interaction with a set up on the heating zone 12 cookware 18.
- the switch 16 comprises a movable switching tongue 20, which may be suspended resiliently or, as shown in Figure 1, to a support point 28 against the force of a return spring can be rotatably or pivotally mounted.
- the return spring can be dispensed with if the weight force of the permanent magnet 26 returns the switching tongue 20 to the first position.
- the switching tongue 20 of the switch 16 comprises a contact region 22, which in a first position of the switching tongue 20 has a distance to a fixed contact 24 of the switch 16 and in a second position of the switching tongue 20 abuts against the fixed contact 24 ( Figure 2).
- the contact area 22 and the fixed contact 24 are coated with precious metal to prevent corrosion.
- the return spring or gravity drives the switching tongue 20 from the first position to the second position.
- a permanent magnet 26 serves to generate the magnetic force through an interaction with a ferromagnetic bottom 30 of the cookware part 18th
- FIG. 2 shows the configuration of the switch 16 after setting up a cookware part 18, for example a saucepan or a pan.
- the cookware part 18 has a bottom 30 made of a ferromagnetic iron-containing material.
- the ferromagnetic material is magnetized by the magnetic field of the permanent magnet 26 arranged on the switching tongue 20, and a magnetic attraction force is generated between the bottom 30 of the cookware part 18 and the permanent magnet 26.
- the permanent magnet 26 is moved by the magnetic force in the direction of the bottom 30, ie in the direction of the underside of the hob surface 10, so that a torque is generated on the switching tongue 20.
- the switching tongue 20 moves driven by the magnetic force acting on the permanent magnet 26 in the second position.
- the switch 16 shown in Figures 1 and 2 is used by the control unit of a hob according to another embodiment of the invention in a method implemented in the control unit for detecting a cookware part 18 on a hob.
- the jam unit uses a state of a magnetic force actuatable switch 16 below the hob as a measure of the presence of the cookware part 18.
- the control unit recognizes that a cookware part 18, i. a pot or pan, was placed on the relevant heating zone 12.
- the control unit recognizes at an interrupted power connection via the switch 16 that there is no pot on the relevant heating zone 12.
- FIG. 3 shows a hob with a hob surface 10b and with a cooking utensil part 18b set up on the hob and designed as a saucepan.
- the cookware part 18b has a permanent magnet 26b incorporated in its bottom 30b.
- the following description is essentially limited to differences from the embodiment described above. Identical or analogous features are provided with the same reference numerals, wherein for distinguishing the exemplary embodiments, the reference numbers shown in FIG. 3 are provided with the letter b.
- a switch 16b is arranged, which is designed as a reed contact.
- a movable switching tongue 20b of the switch 16b has a noble metal-coated, otherwise formed of ferromagnetic soft iron contact.
- the switch 16b is arranged in an outer shell 32 filled with shielding gas.
- FIG. 4 shows a cooking hob according to the invention in a plan view.
- the hob comprises a flat hob surface 10 with four circular heating zones 12a-12d, under each of which an induction heating element is arranged.
- a switch 16a - 16d is arranged, which corresponds in terms of operation and structure of the switch 16 of Figure 1.
- the corresponding switch 16a-16d is closed by a magnetic interaction with the bottom 30 (FIG. 1) of the cookware part 18.
- the switches 16a-16d are connected in parallel, so that the hob is always activated when at least one cookware part 18 is on at least one of the heating zones 12a-12d.
- FIG. 5 shows an alternative embodiment of the invention in which four switches 16a-16d of the type described in connection with FIG. 1 are each arranged in an edge region of one of four heating zones 12a-12d of a hob. By arranging the switches on the edge of the heating zones 12a-12d, installation space in the center of the heating zones 12a-12d can be saved.
- FIG. 6 shows a further alternative embodiment of the invention, in which a single switch 16 is arranged in the center of the entire hob surface 10, ie between four circular heating zones 12a-12d of the hob.
- the switch 16 can also be arranged between two or three heating zones. Further, it would be conceivable to enhance the magnetic interaction between the cookware part 18 and the switch 16 by a metal element with high magnetic conductivity.
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Cookers (AREA)
- Electric Stoves And Ranges (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE112008000414T DE112008000414A5 (de) | 2007-03-13 | 2008-02-25 | Kochfeld und Verfahren zum Detektieren eines Kochgeschirrteils |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ESP200700756 | 2007-03-13 | ||
ES200700756A ES2321262B1 (es) | 2007-03-13 | 2007-03-13 | Campo de coccion y procedimiento para la deteccion de una pieza de bateria de cocina. |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2008110450A2 true WO2008110450A2 (de) | 2008-09-18 |
WO2008110450A3 WO2008110450A3 (de) | 2009-01-22 |
Family
ID=39708572
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2008/052268 WO2008110450A2 (de) | 2007-03-13 | 2008-02-25 | Kochfeld und verfahren zum detektieren eines kochgeschirrteils |
Country Status (3)
Country | Link |
---|---|
DE (1) | DE112008000414A5 (de) |
ES (1) | ES2321262B1 (de) |
WO (1) | WO2008110450A2 (de) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3316663A1 (de) * | 2016-10-25 | 2018-05-02 | Electrolux Appliances Aktiebolag | Induktionskochfeld und verfahren zur steuerung eines induktionskochfelds |
EP3518618B1 (de) | 2009-07-29 | 2020-09-16 | BSH Hausgeräte GmbH | Kochfeld mit zumindest zwei heizzonen |
EP4033153A1 (de) * | 2021-01-20 | 2022-07-27 | Electrolux Appliances Aktiebolag | Haushaltsgerät mit bereitschaftsfunktion |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3796850A (en) * | 1973-05-31 | 1974-03-12 | Westinghouse Electric Corp | Pan detector for induction heating cooking unit |
US3993885A (en) * | 1974-02-04 | 1976-11-23 | Matsushita Electric Industrial Co., Ltd. | Pan detector for an induction heating apparatus |
GB1515131A (en) * | 1974-06-17 | 1978-06-21 | Matsushita Electric Ind Co Ltd | Induction heating apparatus |
US4334135A (en) * | 1980-12-22 | 1982-06-08 | General Electric Company | Utensil location sensor for induction surface units |
US4394565A (en) * | 1981-11-23 | 1983-07-19 | General Electric Company | Power disconnect assembly for electric heating elements |
JPH04239815A (ja) * | 1991-01-23 | 1992-08-27 | Tokin Corp | 非接触オンオフスイッチ |
EP0962950A2 (de) * | 1998-05-02 | 1999-12-08 | GRUNDIG Aktiengesellschaft | Gerät der Unterhaltungselektronik mit Netzabschaltung im Bereitschaftsbetrieb |
-
2007
- 2007-03-13 ES ES200700756A patent/ES2321262B1/es not_active Expired - Fee Related
-
2008
- 2008-02-25 DE DE112008000414T patent/DE112008000414A5/de not_active Ceased
- 2008-02-25 WO PCT/EP2008/052268 patent/WO2008110450A2/de active Application Filing
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3796850A (en) * | 1973-05-31 | 1974-03-12 | Westinghouse Electric Corp | Pan detector for induction heating cooking unit |
US3993885A (en) * | 1974-02-04 | 1976-11-23 | Matsushita Electric Industrial Co., Ltd. | Pan detector for an induction heating apparatus |
GB1515131A (en) * | 1974-06-17 | 1978-06-21 | Matsushita Electric Ind Co Ltd | Induction heating apparatus |
US4334135A (en) * | 1980-12-22 | 1982-06-08 | General Electric Company | Utensil location sensor for induction surface units |
US4394565A (en) * | 1981-11-23 | 1983-07-19 | General Electric Company | Power disconnect assembly for electric heating elements |
JPH04239815A (ja) * | 1991-01-23 | 1992-08-27 | Tokin Corp | 非接触オンオフスイッチ |
EP0962950A2 (de) * | 1998-05-02 | 1999-12-08 | GRUNDIG Aktiengesellschaft | Gerät der Unterhaltungselektronik mit Netzabschaltung im Bereitschaftsbetrieb |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3518618B1 (de) | 2009-07-29 | 2020-09-16 | BSH Hausgeräte GmbH | Kochfeld mit zumindest zwei heizzonen |
EP3316663A1 (de) * | 2016-10-25 | 2018-05-02 | Electrolux Appliances Aktiebolag | Induktionskochfeld und verfahren zur steuerung eines induktionskochfelds |
EP4033153A1 (de) * | 2021-01-20 | 2022-07-27 | Electrolux Appliances Aktiebolag | Haushaltsgerät mit bereitschaftsfunktion |
WO2022157070A1 (en) * | 2021-01-20 | 2022-07-28 | Electrolux Appliances Aktiebolag | Domestic appliance with stand-by function |
Also Published As
Publication number | Publication date |
---|---|
ES2321262A1 (es) | 2009-06-03 |
WO2008110450A3 (de) | 2009-01-22 |
DE112008000414A5 (de) | 2009-12-10 |
ES2321262B1 (es) | 2010-03-04 |
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