EP2494846A1 - Cook top comprising at least two heating elements and a power electronics arrangement - Google Patents
Cook top comprising at least two heating elements and a power electronics arrangementInfo
- Publication number
- EP2494846A1 EP2494846A1 EP10776822A EP10776822A EP2494846A1 EP 2494846 A1 EP2494846 A1 EP 2494846A1 EP 10776822 A EP10776822 A EP 10776822A EP 10776822 A EP10776822 A EP 10776822A EP 2494846 A1 EP2494846 A1 EP 2494846A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- heating elements
- power supply
- heating
- power
- relays
- 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.)
- Granted
Links
- 238000010438 heat treatment Methods 0.000 title claims abstract description 118
- 238000010411 cooking Methods 0.000 claims description 5
- 238000000034 method Methods 0.000 abstract 1
- 230000006698 induction Effects 0.000 description 6
- 230000005611 electricity Effects 0.000 description 5
- 230000000712 assembly Effects 0.000 description 2
- 238000000429 assembly Methods 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 2
- 238000013016 damping Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000005291 magnetic effect Effects 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 239000012141 concentrate Substances 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 230000005294 ferromagnetic effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000000411 inducer Substances 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
- 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
- H05B6/065—Control, e.g. of temperature, of power for cooking plates or the like using coordinated control of multiple induction coils
-
- 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
Definitions
- Hob with at least two heating elements and one
- the invention relates to a hob with at least two heating elements and a power electronics assembly according to the preamble of claim 1.
- Cooking hobs are known from EP 0 986 287 B1 and from EP 0 971 562 B1, which comprise a plurality of heating elements and a power electronics arrangement for connecting the hob to one or more phases of a household power grid. It is common to use separate power electronics assemblies each with a filter and a rectifier for each phase of a household power grid. Hobs, which are connected to only one phase of the household electricity network, are usually of low cost and simple design and have due to the power limitation of the household electricity network over a limited heating capacity, which may be for example a maximum of 4.6 kW.
- Such switch assemblies typically combine a large number of heating elements, for example, small inducers of a matrix cooktop, with a much smaller number of power supply units, such as inverters.
- the switch assembly therefore branches in the direction of the heating elements and each heating element is usually associated with the end of a branch of the branching tree structure.
- Each of the heating elements can therefore be supplied in exactly one way with a power supply. be connected. Exceptions to this rule can be found in cooktops with a so-called booster mode, in which two power supply units can be interconnected to operate a single heating element.
- a corresponding electromechanical relay opens or closes a bridge between the two power supply units, in particular between two inverters of an induction hob. Since the heating power is to be concentrated in the booster mode just on a heating element, in each case a further switch is disposed between this switch bridge and the heating elements, which can separate the heating elements not to be heated from the power supply.
- the invention is therefore based on the object of making the association between power supply units and heating elements more flexible, reducing the number of switching operations necessary for the alternating use of a power supply unit for a plurality of heating elements and simplifying compliance with standards for electromagnetic compatibility. Furthermore, the invention has the object to enable emergency operation of the hob even if one of the switches in the switch assembly is rendered inoperable by a defect.
- the object is achieved in particular by a hob with the features of claim 1. Further advantageous embodiments of the invention will become apparent from the dependent claims.
- the invention is particularly based on a hob with at least two heating elements and a power electronics assembly for connection to a single phase of a household electricity network.
- the power electronics assembly includes a plurality of power supply units for supplying each one or more heating elements with heating currents.
- the hob comprises a switch arrangement with several electric Romechanischen relay for connecting and / or separating the power supply units with or from the heating elements.
- the invention relates to cooktops with at least three heating zones or at least three heating elements, which are fed by a single phase of the household power network and which are arranged, for example, under a cover plate with edge lengths between 60 and 80 cm.
- At least one of the heating elements is fixedly connected to one of at least two output terminals of at least two of the electromechanical relays.
- a redundant switch arrangement is realized, in which the heating element can be supplied with heating current optionally via two different paths, wherein each of the paths comprises one of the two relays.
- the heating elements are inductors and the power supply units comprise an inverter which can generate a high-frequency heating current from the rectified and possibly filtered current from the domestic power grid.
- the frequencies of heating currents in induction hobs are typically between 20 kHz and 100 kHz.
- the sum of the nominal outputs of the heating elements can be selected greater than the nominal power of the power electronics assembly.
- the nominal power of the power electronics assembly is usually just below the maximum available power of a phase of the household power grid and can be, for example, 4.6 kW for Germany.
- the maximum power consumed by the power electronics can also be made adjustable depending on the available power. This setting can be used in combination with other country settings, such as a time zone and / or language.
- each of the heating elements is fixedly connected to one of at least two output terminals of at least two of the electromechanical relays.
- the redundant power supply can thus be realized for each of the heating elements.
- one or more heating elements may be connected to one of at least two output terminals of only a single electromagnetic relay.
- the power electronics assembly includes a low pass filter and a rectifier shared for all power supply units.
- single-pole changeover switches can be used as electromechanical relays, wherein the two output poles can be connected to different heating elements.
- a common center terminal of the relay is connected to a power supply unit and the two output poles of the relay are each arranged with a heating element or in the connection between the heating element and the power supply unit in the corresponding direction.
- a further increased flexibility of the switch arrangement can be realized by a plurality of series-connected relays in a connection between a power supply unit and a heating element.
- the switch arrangement may in particular comprise a plurality of branch layers.
- the number of branch layers or the number of relays connected in series can also be designed differently for different heating elements.
- the centrally arranged heating elements can be combined very flexibly with other heating elements to form heating zones, which is not necessary to the same extent for heating elements which are arranged at the edge of the heating zone.
- FIG. 1 schematically shows the structure of a hob with a plurality of heating elements and a power electronics assembly for connection to a single phase of a household electricity network
- FIG. 2 shows schematically the structure of a hob according to an alternative embodiment of the invention
- Fig. 3 shows schematically the structure of a hob after another
- Fig. 4 shows schematically the structure of a hob in a generalization of the inventive concept.
- Fig. 1 shows schematically a hob with four heating elements 10a-10d and a power electronics assembly 12.
- the power electronics assembly is used to connect the hob to a single phase 14 of a household electricity network and supplies the entire hob from the flow of this phase fourteenth
- the power electronics assembly comprises a filter 16 and a rectifier 18, which filter the AC current drawn from the household power grid and in a DC ström, which undergoes further filtering by a damping capacitor 20.
- the filter 16 is a low-pass filter that prevents damage to the hob by strong pulses from the household power grid and flicker amplifying feedback from the hob in the household power grid.
- the power electronics module further comprises two power supply units 22a, 22b, which are designed as inverters and which are operated by a control unit not shown here so that a heating current is generated with a desired heating frequency.
- the two inverters 22a, 22b can thereby generate heating currents with different heating frequencies, different amplitudes and / or different load cycles or phases in order to generate the desired heating power in the heating elements 10a-10d.
- the heating elements 10a-10d are inductors that generate a high-frequency magnetic field at the frequency of the heating current. The magnetic field induces eddy currents in a ferromagnetic ground of a cooking utensil element placed on the cooking field in the region of the relevant heating element 10a-10d, which is heated thereby.
- a switch arrangement 24 with electromechanical relays 26a-26d is arranged between the power supply units 22a, 22b and the heating elements 10a-10d.
- the relays 26a-26d are unipolar changeover switches whose common center connection is connected to a respective pole of two further relays 28a, 28b.
- the further relays 28a, 28b are connected via their center connection to a respective power supply unit 22a, 22b.
- Each of the power supply units 22a, 22b can be connected to each of the heating elements 10a-10d by suitable switching of the relays 26a, 26b, 28a-28d.
- the heating elements 10a-10d are in turn fixedly connected to two output terminals of two different relays 26a-26d of the second relay layer of the switch arrangement 24.
- each of the heating elements 10a-10d can be connected to both power supply units 22a, 22b at the same time in order to concentrate the total available energy on the heating element 10a-10d in question.
- the two power supply units 22a, 22b designed as inverters should generate heating currents with the same heating frequency in order to avoid destructive interference.
- the output poles of the relays 26a-26d, to which one of the heating elements 10a-10d is connected, are selected so that in the non-switching state of the relays 26a-26d exactly one of the two relays connects the heating element 10a-10d to one of the power supply units 22a, 22b while the other relay 26a-26d disconnects the connection to the other power supply unit 22a, 22b.
- the heating element 10a is thus connected, for example, to the normally closed (NC) output terminal of the relay 26b and to the normally open (NO) output terminal of the relay 26c.
- the sum of the nominal powers of the heating elements 10a-10d is greater than the nominal power of the power electronics assembly 12 and the phase 14 of the household power grid.
- the sum of the nominal outputs of the heating elements 10a-10d can be 7.2 kW and the nominal power of the power electronics assembly 4.6 kW.
- FIG. 1 two-layer structure of the switch assembly 24 are each two series-connected relays 28a, 28b, 26a-26d arranged in the connections between the heating elements 10a-10d and the power supply units 22a, 22b.
- Fig. 2 shows a further embodiment of the invention.
- the following description is essentially limited to differences from the exemplary embodiment illustrated in FIG. 1, while reference is made to the description in FIG. 1 with regard to features that are the same.
- the hob comprises three heating elements 10a-10c and the switch assembly 24 includes only a total of four relays
- the heating element 10a is connected to the power supply units 22a, 22b via only one relay 28a, 28b, while the heating elements 10b, 10c are connected to the power supply units 22a, 22b via two series-connected relays 26a, 28a and 26b, 28b, respectively.
- Fig. 3 shows a further alternative embodiment of the invention with only two relays 26a, 26b and three heating elements 10a, 10b, 10c. Of the heating elements, only the middle heating element 10b is connected to output terminals of both relays 26a, 26b, while the heating elements 10a are connected to the output terminal of only one relay 26a, 26b, respectively.
- FIG. 4 shows a generalization of the structure of an induction hob according to the invention with M power supply units 22.1 -22.
- N which via a switch assembly 24 with the power supply units 22.1 -22. M are connected. It is M ⁇ N.
- K of the array 24 is at least as large as the smallest integer greater than the 2's logarithm of the number of power supply units M.
- the switch assembly 24 may be on a separate board or together with the power supply units 22.1 -22.
- M can be mounted on a single board. The same applies to the low-pass filter 16 and the rectifier 18. These elements can also be used on a separate board or together with the power supply units 22.1 -22. M can be mounted on a large board.
- the invention can be used both for traditional well mirrors with four fixed heating zones and for matrix hobs with a large number of heating elements arranged in a grid and flexibly combined to heat a single pot.
- the topology in Fig. 3 is particularly suitable for wells with so-called paella heating zones, in which in the middle of the hob by means of the central heating element 10b, a large heating zone for heating a Paellapfanne is generated.
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Induction Heating Cooking Devices (AREA)
- Control Of Resistance Heating (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ES200930899A ES2382862B1 (en) | 2009-10-26 | 2009-10-26 | COOKING HOB WITH AT LEAST TWO HEATING ELEMENTS AND A POWER ELECTRONICS PROVISION |
PCT/IB2010/054723 WO2011051856A1 (en) | 2009-10-26 | 2010-10-19 | Cook top comprising at least two heating elements and a power electronics arrangement |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2494846A1 true EP2494846A1 (en) | 2012-09-05 |
EP2494846B1 EP2494846B1 (en) | 2015-07-22 |
Family
ID=43430383
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP10776822.8A Active EP2494846B1 (en) | 2009-10-26 | 2010-10-19 | Cook top comprising at least two heating elements and a power electronics arrangement |
Country Status (5)
Country | Link |
---|---|
US (1) | US10925122B2 (en) |
EP (1) | EP2494846B1 (en) |
CN (1) | CN102577597B (en) |
ES (2) | ES2382862B1 (en) |
WO (1) | WO2011051856A1 (en) |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ES2643136T3 (en) | 2011-03-29 | 2017-11-21 | BSH Hausgeräte GmbH | Switching device |
CN102809180B (en) * | 2012-08-07 | 2015-02-11 | 美的集团股份有限公司 | Uniform heating stove and control method thereof |
EP2888925B1 (en) * | 2012-08-27 | 2018-02-21 | BSH Bosch und Siemens Hausgeräte GmbH | Domestic appliance device |
ES2538605B1 (en) * | 2013-12-20 | 2016-04-15 | Bsh Electrodomésticos España, S.A. | Cooking Field Device |
US10440783B2 (en) * | 2014-03-24 | 2019-10-08 | BSH Hausgeräte GmbH | Cooking appliance device having a self-controlling bypassing unit |
US9752784B2 (en) | 2014-07-21 | 2017-09-05 | Electrolux Home Products, Inc. | Heating element control circuit |
ES2633517B1 (en) * | 2016-03-21 | 2018-07-04 | Bsh Electrodomésticos España, S.A. | Cooking appliance |
EP3307017B1 (en) * | 2016-10-06 | 2019-05-22 | Whirlpool Corporation | Versatile induction hob |
ES2673131B1 (en) * | 2016-12-19 | 2019-03-28 | Bsh Electrodomesticos Espana Sa | DOMESTIC COOKING DEVICE FOR INDUCTION WITH A MATRIX OF HEATING ELEMENTS |
US10993292B2 (en) * | 2017-10-23 | 2021-04-27 | Whirlpool Corporation | System and method for tuning an induction circuit |
ES2719129A1 (en) * | 2018-01-08 | 2019-07-08 | Bsh Electrodomesticos Espana Sa | COOKING FIELD DEVICE (Machine-translation by Google Translate, not legally binding) |
CN112020165B (en) * | 2019-05-30 | 2021-11-12 | 宁波方太厨具有限公司 | Electromagnetic heating plate, electromagnetic stove and control method of electromagnetic stove |
Family Cites Families (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3806688A (en) * | 1972-04-13 | 1974-04-23 | Westinghouse Electric Corp | Induction heat cooking apparatus |
GB1446737A (en) * | 1972-11-15 | 1976-08-18 | Matsushita Electric Ind Co Ltd | Induction cooking appliances |
DE3204543A1 (en) * | 1982-02-10 | 1983-08-18 | Bosch Siemens Hausgeraete | CIRCUIT ARRANGEMENT FOR HEATING ELEMENTS IN COOKING BASIN |
DE3204598A1 (en) * | 1982-02-10 | 1983-08-18 | Bosch Siemens Hausgeraete | CIRCUIT ARRANGEMENT FOR HEATING ELEMENTS IN COOKER BASINS |
CN1134885C (en) * | 1996-03-13 | 2004-01-14 | 松下电器产业株式会社 | High-frequency inverter and induction cooking device using the same |
FR2758934B1 (en) | 1997-01-24 | 1999-04-23 | Europ Equip Menager | MULTI-PURPOSE INDUCTION COOKING FIREPLACE |
ES2143430B1 (en) | 1998-09-08 | 2000-12-16 | Balay Sa | TWO OUTPUTS INVERTER CIRCUIT, AND CIRCUIT AND PROCEDURE FOR CONTROLLING THE POWER DELIVERED IN THE INVERTER OUTPUTS. |
FR2792158B1 (en) * | 1999-04-09 | 2001-05-18 | Jaeger Regulation | MODULAR INDUCTION COOKING FIREPLACE WITH REDUCED RADIATION AND METHOD OF MAKING |
EP1424156A1 (en) | 2002-11-29 | 2004-06-02 | Leica Geosystems AG | Process for soldering miniaturized components onto a base plate |
ES2201937B1 (en) * | 2003-11-03 | 2005-02-01 | Bsh Electrodomesticos España, S.A. | PROCEDURE FOR THE OPERATION OF A CONVERTER CIRCUIT. |
ES2300168B1 (en) * | 2005-10-27 | 2009-05-08 | Bsh Electrodomesticos España, S.A. | KITCHEN HOB AND PROCEDURE FOR THE OPERATION OF A KITCHEN HOB. |
ES2310962B1 (en) * | 2006-12-04 | 2009-10-23 | Bsh Electrodomesticos España, S.A. | HEATING DEVICE CIRCUIT. |
ES2330496B1 (en) | 2007-10-31 | 2010-09-08 | Bsh Electrodomesticos España, S.A. | COOKING DEVICE. |
JP5052329B2 (en) * | 2007-12-27 | 2012-10-17 | 和光電研株式会社 | Electromagnetic induction heating device |
DE102008015036A1 (en) * | 2008-03-14 | 2009-09-17 | E.G.O. Elektro-Gerätebau GmbH | Apparatus and method for controlling induction heating of an induction hob |
EP2306784A1 (en) * | 2009-10-05 | 2011-04-06 | Whirlpool Corporation | Method for supplying power to induction cooking zones of an induction cooking hob having a plurality of power converters, and induction cooking hob using such method |
US8344292B2 (en) * | 2009-12-21 | 2013-01-01 | Whirlpool Corporation | Rotary switch with improved simmer performance |
-
2009
- 2009-10-26 ES ES200930899A patent/ES2382862B1/en not_active Withdrawn - After Issue
-
2010
- 2010-10-19 WO PCT/IB2010/054723 patent/WO2011051856A1/en active Application Filing
- 2010-10-19 ES ES10776822.8T patent/ES2545101T3/en active Active
- 2010-10-19 CN CN201080048456.5A patent/CN102577597B/en active Active
- 2010-10-19 EP EP10776822.8A patent/EP2494846B1/en active Active
- 2010-10-19 US US13/503,384 patent/US10925122B2/en active Active
Non-Patent Citations (1)
Title |
---|
See references of WO2011051856A1 * |
Also Published As
Publication number | Publication date |
---|---|
ES2382862B1 (en) | 2013-05-08 |
WO2011051856A1 (en) | 2011-05-05 |
CN102577597A (en) | 2012-07-11 |
US20120205365A1 (en) | 2012-08-16 |
US10925122B2 (en) | 2021-02-16 |
ES2545101T3 (en) | 2015-09-08 |
EP2494846B1 (en) | 2015-07-22 |
CN102577597B (en) | 2015-07-01 |
ES2382862A1 (en) | 2012-06-14 |
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Inventor name: BARRAGAN PEREZ, LUIS ANGEL Inventor name: ARTIGAS MAESTRE, JOSE IGNACIO Inventor name: MEDIANO HEREDIA, ARTURO Inventor name: GARCIA JIMENEZ, JOSE-RAMON Inventor name: PARICIO AZCONA, JOSE JOAQUIN Inventor name: MONTERDE AZNAR, FERNANDO Inventor name: DE LA CUERDA ORTIN, JOSE MARIA Inventor name: MILLAN SERRANO, IGNACIO Inventor name: ANTON FALCON, DANIEL Inventor name: BERNAL RUIZ, CARLOS Inventor name: CARRETERO CHAMARRO, CLAUDIO Inventor name: NAVARRO TABERNERO, DENIS Inventor name: PUYAL PUENTE, DIEGO Inventor name: LLORENTE GIL, SERGIO Inventor name: HERNANDEZ BLASCO, PABLO JESUS Inventor name: MOROS SANZ, DANIEL Inventor name: URRIZA PARROQUE, ISIDRO Inventor name: LUCIA GIL, OSCAR Inventor name: BURDIO PINILLA, JOSE MIGUEL Inventor name: JIMENEZ NAVASCUES, OSCAR |
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