EP0817531B1 - Flexible und rekonfigurierbare Topologie - Google Patents

Flexible und rekonfigurierbare Topologie Download PDF

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Publication number
EP0817531B1
EP0817531B1 EP19970500109 EP97500109A EP0817531B1 EP 0817531 B1 EP0817531 B1 EP 0817531B1 EP 19970500109 EP19970500109 EP 19970500109 EP 97500109 A EP97500109 A EP 97500109A EP 0817531 B1 EP0817531 B1 EP 0817531B1
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EP
European Patent Office
Prior art keywords
induction
power
electric circuit
circuit according
heating plates
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.)
Expired - Lifetime
Application number
EP19970500109
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English (en)
French (fr)
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EP0817531A2 (de
EP0817531A3 (de
Inventor
José Andrés Garcia Martinez
José Ramon Garcia Giménez
Abelardo Martinez Iturbe
José Miguel Burdio Pinilla
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BSH Balay SA
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BSH Balay SA
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Publication of EP0817531A3 publication Critical patent/EP0817531A3/de
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Publication of EP0817531B1 publication Critical patent/EP0817531B1/de
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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
    • 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
    • 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

Definitions

  • the object of the present invention is a flexible and re-configurable topology based on the three-phase bridge with non-symmetric legs, which being used as a power source for two coils as those used in an induction cooking plates, it improves the cooking plate performances because it allows the utilization of all the installed power for both coils and using it for driving one of them. In this way it is obtained a heating element with a power boosted over nominal values, allowing an ultra fast heating of the pot or pan, shortening the rising time necessary to reach the stationary thermal state.
  • the initial basic idea is extended to get that all the installed power for both coils to be used for driving any of them.
  • the inherent flexibility of the topology allows to accomplish optimal control procedures in the management of the power losses in the semiconductor devices, oriented to reduce their operation temperature, leading to an improving in the system reliability and integrability, and reducing the heat sinking demands.
  • This invention relates to induction heating and more specifically to a bridge inverter topology which has a variable structure suitable for use in induction heating apparatus having ultra-fast heating ability and optimised semiconductor switches power losses.
  • induction cooking is the eddy current and hysteretic losses in the surface of a metallic object therein, it has several advantages over heating by conventional techniques as convection or conduction. Induction heating is usually faster than convection or conduction heating because lower thermal mass is associated with induction heating systems. In addition, the induction heating focuses the heat within the heated object yielding higher energy transfer efficiency in contrast to convection or conduction heating wherein the heat is produced outside the heated object.
  • the domestic induction heating hobs are driven by an alternative current of medium frequency (25-65 kHz) applied to a induction coil which heats by induction a pot or a pan placed on the coil.
  • This current is generated by a power converter based on solid-state power devices.
  • Patent ES-539,790 and DE-A1-3 601 958 wherein an electronic system drives by a high frequency pulsed current a thermal plate as those used in an electric hob.
  • This system uses a full-bridge inverter with MOS transistors which drives a flat coil housed inside a thermal plate by a serial of high frequency power pulses heating ferromagnetic pots or pans.
  • the transistorised full-bridge described in the aforementioned Patent is activated by a control circuit which achieves the regulation and the self adaptation of the firing time for each leg of the transistorised full-bridge, scheduled in relation with the inductive-energy time-recovering of the flat coil, and stopping the powering of the coil when there is non-ferromagnetic load. In that way, when a ferromagnetic pot or pan is placed on the thermal plate a thermal plate with self-firing ability is achieved.
  • the induction heating method is fast, the rising time necessary to reach the stationary thermal state can be shortened if the spare power drive capacity of an idle bridge which normally drives other induction heating plate are used to boost the bridge which drives the active induction plate.
  • Another application of the idle bridge is to help in the reduction of the overall conduction losses of the power semiconductor switches of the active bridge.
  • the three-phase bridge is non-symmetric because two of its legs are rated for the nominal ratings of the two loads, respectively.
  • the two loads are two coils which constitute the two heating plates of an induction cooking hob.
  • the third leg so called the common leg, is rated for the addition of the ratings of both loads.
  • the obtained topology allows to drive both coils used as heating plates of an induction cooking hob, independently. Conversely, when the switch is activated, the obtained topology allows two legs to be connected in parallel. Consequently, the drive capacity is the addition of the drive capacity of both legs connected in parallel.
  • the flexible and re-configurable topology is used as a power source for the two coils used as two heating plates of an induction cooking hob, it allows the improving of the performances of this induction hob because all the drive capacity available for the two coils can be used to apply it for driving one of the coils.
  • the inherent flexibility of the topology allows to accomplish optimal control procedures in the management of the power losses in the semiconductor switches, oriented to reduce their operation temperature, leading to an improving in the system reliability and integrability, and reducing the heat sinking demands.
  • induction module to drive two coils used as heating plates of an induction hob, and to incorporate this module in a mixed induction and non-induction hob.
  • this induction module allows to incorporate two of them to drive four coils used as a heating plates of an induction hob, two of them with a power higher than its nominal rate.
  • the topology with two switches When the topology with two switches is used as power source to drive two coils used as heating plates in an induction cooking hob, it allows an improving in performances because all the installed power for both coils can be used for driving any of them, in such a way that any of the heating plates can provide a heating power higher than its nominal rate, and thus, two ultra-fast heating plates are available for heating a pot or a pan, shortening the rising-temperature time necessary to reach the stationary thermal state of the pot or the pan.
  • the flexibility of the topology with two switches allows to accomplish optimal control procedures in the management of the power losses in the semiconductor devices, oriented to reduce their operation temperature, leading to an improving in the system reliability and integrability, and reducing the heat sinking demands.
  • the two-switches topology allows a modular design building up with it a induction module suitable for driving two coils used as a heating plates of an induction cooking hob, and to incorporate this module in a mixed induction and non-induction cooking hob, even so, two modules can be incorporated to drive four coils used as heating plates in an induction cooking hob, all of them with power boost capacity.
  • FIG. 1. Shows the re-configurable and multi-bridge topology with a single switch and the B2 coil with reinforced power. In this figure it is named:
  • FIG. 2. Shows the re-configurable and multi-bridge topology with two switches and the coils B1 and B2 with reinforced power. This figure uses the same names as in figure 1, but in addition:
  • FIG. 3. This is a table which shows the power availability for each of the B1 and B2 coils versus the switches R1 and R2 activation state represented by "1", or the non-activation state represented by "0".
  • the invention provides a flexible topology which allows the power supplying for two coils independently which are used as heating plates of an induction cooking hob.
  • the basic flexible topology depicted in Figure 1 is used to explain the basic idea. Subsequently, the topology is expanded by doubling the number of switches included to it as depicted in Figure 2, achieving in this way, the improving in flexibility and performances.
  • the three-phase bridge in Figure 1 is constituted by three identical legs (legs S1-S2, S3-S4 and S5-S6) connected in parallel which draws power from a common power source with voltage Vd.
  • Each leg is constituted by a series connection of two power semiconductor switches (the power semiconductor switches are depicted as plain switches and named as S1, S2, S3, S4, S5 and S6) which activation or non-activation states are externally controlled.
  • the functionality of the stage is not affected by the power semiconductor switches used or their technology state.
  • the common point between the semiconductor switches of a leg constitutes an output terminal or one of the output phase of the bridge. If the bridge has three phases as in our case, it is named three-phase bridge.
  • a bridge is not symmetric if all their legs are not identical concerning the controllability of the power semiconductor switches, the working zone of the voltage/current quadrant or the handled power.
  • the modification introduced in the bridge consists in rating individually two of the legs (S1-S2 and S5-S6) with a power handling capacity fitted to the respective coils rating B 1 and B2. These coils constitute two independent heating plates of an induction cooking hob.
  • the third leg formerly named as the common leg, is rated with a power handling capacity equal to the added ratings of the other two legs.
  • the legs different from the common leg are distinguished themselves by naming them as the fixed leg (S5-S6) and the booster leg (S1-S2), respectively.
  • the booster leg output (S1-S2) and the common leg output (S3-S4) it is permanently connected one of the coil which constitutes one of the heating plate of the induction cooking hob, which can receive in its case, a power boost.
  • This coil B2 is distinguished because it is named the power boost coil.
  • the other coil B 1 is distinguished because it is named the coil without power boost.
  • the fixed leg output (S5-S6) is connected to the common pole of the two positions switch. When the switch is in its activated state (no position), it connects the coil without power boost B1 between the fixed leg output (S5-S6) and the common leg output (S3-S4).
  • the switch When the switch is not in its activated state (nc position), it connects in parallel the booster leg output (S1-S2) to the fixed leg output (S5-S6). In this way, the coil without power boost B1 is in open circuit and the coil with power boost B2 has available all the installed power being able to draw a power higher than its nominal rate, that is the reason because it is named power boost coil B2.
  • Figure 3 shows as a table, the power availability for each of the coils B1 and B2 versus the activation state represented as (1) or the non-activation state represented as (0) for both switches R1 and R2.
  • the two-switches topology allows a modular design building up with it an induction module suitable for driving two coils used as a heating plates of an induction hob, and to incorporate this module in a mixed induction and non-induction cooking hob, even so, two modules can be incorporated to drive four coils used as heating plates in an induction cooking hob, all of them with power boost capacity.
  • the switch position depicted in Figure 1 corresponds to its non-activated state.
  • the common pole of the switch is electrically connected to its normally-close pole (nc), thus, paralleling the fixed leg and the booster leg. In this way all the installed power is available for the coil with power boost B2.
  • the common pole of the switch is electrically connected to its normally-open pole (no), thus, the fixed leg powers the coil B1 and the booster leg powers the coil B2.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Induction Heating Cooking Devices (AREA)
  • General Induction Heating (AREA)
  • Ac-Ac Conversion (AREA)

Claims (14)

  1. Elektrische Schaltung, umfassend eine Drehstrombrücke (S1 - S2, S3 - S4, S5 - S6), um zwei Lasten (B1, B2) anzusteuern, die zwischen einem ersten Anschluss (+) einer gemeinsamen Stromquelle mit einer Spannung (Vd) für das Abgeben von Leistung an die Lasten (B1, B2) und einem zweiten Anschluss (-), bei der die Brücke (S1 - S2, S3 - S4, S5 - S6) einen ersten Schalter (R1) umfasst, um eine (B2) der Lasten (B1, B2) bei ihrer Nennleistung von 100 % oder bei einer Leistung, die höher als ihre Nennleistung ist, in Abhängigkeit von der Position (no; nc) des ersten Schalters (R1) anzusteuern, angeschlossen sind.
  2. Elektrische Schaltung nach Anspruch 1, bei der die Lasten (B1, B2) zwei Spulen sind.
  3. Elektrische Schaltung nach Anspruch 2, bei der die Spulen (B1, B2) zwei Heizplatten eines induktiven Kochfeldes bilden.
  4. Elektrische Schaltung nach einem der vorhergehenden Ansprüche, die ermöglicht, beide Lasten (B1, B2) unabhängig (no) anzusteuern, wenn der erste Schalter (R1) nicht eingeschaltet ist.
  5. Elektrische Schaltung nach einem Anspruch 1 bis 3, die ermöglicht, wenn der erste Schalter (R1) eingeschaltet ist, zwei Zweige der Brücke (S1 - S2, S3 - S4, S5 - S6) parallel zu verbinden, bei der die Ansteuerungskapazität die Addition der Ansteuerungskapazität der beiden parallel (nc) verbundenen Brückenzweige ist.
  6. Elektrische Schaltung nach einem der vorhergehenden Ansprüche, die einen modularen Konstruktionsaufbau mit ihrem induktiven Modul ermöglicht, um zwei Spulen (B1, B2) anzusteuern, die als Heizplatten eines induktiven Kochfeldes verwendet werden, bei der die Leistungsverstärkung einer der Spulen (B1, B2) zur Verfügung steht.
  7. Elektrische Schaltung nach Anspruch 6, die ermöglicht, die modulare Ausführung in einem gemischten induktiven und nichtinduktiven Kochfeld mit zwei Induktionsheizplatten einzubauen, bei der die Leistungsverstärkung einer der Spulen (B1, B2) zur Verfügung steht.
  8. Elektrische Schaltung nach Anspruch 6, die ermöglicht, zwei der modularen Ausführungen in einem induktiven Kochfeld mit vier Heizplatten einzubauen, bei dem die Leistungsverstärkung von zwei davon zur Verfügung steht.
  9. Elektrische Schaltung nach Anspruch 1, bei der die Brücke (S1 - S2, S3 - S4, S5 - S6) den ersten (R1) und einen zweiten Schalter (R2) umfasst, um beide Lasten (B1, B2) bei ihrer Nennleistung (100 %) oder eine (B1, B2) der Lasten (B1, B2) bei einer Leistung (> 100 %), die höher als ihre Nennleistung ist, in Abhängigkeit von der Position (no; nc) der Schalter (R1, R2) anzusteuern.
  10. Elektrische Schaltung nach Anspruch 9, die ermöglicht, die modulare Ausführung in einem induktiven Kochfeld mit zwei Induktionsheizplatten einzubauen, bei der die gesamte installierte Leistung für beide Lasten (B1, B2) für das Ansteuern jeder davon ohne Unterscheidung verwendet wird.
  11. Elektrische Schaltung nach Anspruch 9, die ermöglicht, dass die modulare Ausführung zwei Heizplatten mit Leistungsverstärkungskapazität aufweist.
  12. Elektrische Schaltung nach Anspruch 9, die den modularen Konstruktionsaufbau mit einem induktiven Modul ermöglicht, um zwei Spulen (B1, B2) anzusteuern, die als Heizplatten eines induktiven Kochfeldes verwendet werden, bei der beide Heizplatten die Leistungsverstärkungskapazität aufweisen.
  13. Elektrische Schaltung nach Anspruch 9, die ermöglicht, die modulare Ausführung in einem gemischten induktiven und nichtinduktiven Kochfeld mit zwei Induktionsplatten einzubauen, bei der beide Induktionsheizplatten die Leistungsverstärkungskapazität aufweisen.
  14. Elektrische Schaltung nach Anspruch 9, die ermöglicht, die modulare Ausführung in einem induktiven Kochfeld mit vier Heizplatten einzubauen, bei der alle Heizplatten die Leistungsverstärkungskapazität aufweisen.
EP19970500109 1996-06-26 1997-06-25 Flexible und rekonfigurierbare Topologie Expired - Lifetime EP0817531B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ES9601437 1996-06-26
ES9601437A ES2128941B1 (es) 1996-06-26 1996-06-26 Circuito inversor de configuracion variable.

Publications (3)

Publication Number Publication Date
EP0817531A2 EP0817531A2 (de) 1998-01-07
EP0817531A3 EP0817531A3 (de) 1998-04-08
EP0817531B1 true EP0817531B1 (de) 2003-11-12

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EP19970500109 Expired - Lifetime EP0817531B1 (de) 1996-06-26 1997-06-25 Flexible und rekonfigurierbare Topologie

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EP (1) EP0817531B1 (de)
DE (1) DE69726057T2 (de)
ES (1) ES2128941B1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103444261A (zh) * 2011-03-31 2013-12-11 Bsh博世和西门子家用电器有限公司 家用器具装置
EP4657981A1 (de) * 2024-05-30 2025-12-03 Whirlpool Corporation Induktionsschaltung für ein kochfeld

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITPN20020043A1 (it) * 2002-06-19 2003-12-19 Electrolux Home Products Corpo Piano di cottura ad induzione.
ES2211303B1 (es) * 2002-08-01 2005-10-01 Bsh Electrodomesticos España, S.A. Placa de cocina de induccion con zonas de calentamiento de estructura reconfigurable y procedimiento para incrementar la potencia maxima de dichas zonas de calentamiento.
ES2338057T5 (es) * 2007-01-23 2023-03-09 Whirlpool Co Método de control para una placa de cocina de inducción y placa de cocina de inducción adaptada para llevar a cabo dicho método
EP2692203B1 (de) * 2011-03-30 2016-05-25 BSH Hausgeräte GmbH Induktionsheizvorrichtung
WO2012131571A1 (de) * 2011-03-31 2012-10-04 BSH Bosch und Siemens Hausgeräte GmbH Induktionsheizvorrichtung
GB202216117D0 (en) * 2022-10-31 2022-12-14 Nicoventures Trading Ltd Inductive heating

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3224738C1 (de) * 1982-07-02 1984-02-09 Aeg-Elotherm Gmbh, 5630 Remscheid Einrichtung zur induktiven Erwaermung eines Werkstueckes mittels mehrerer Induktoren
US4885447A (en) * 1985-01-23 1989-12-05 Balay, S.A. System for the induction heating of the electric plates of a cooker
DE3712242A1 (de) * 1987-04-10 1988-10-27 Thomson Brandt Gmbh Schaltung zur stromversorgung einer induktiven kochstelle
JPS63285894A (ja) * 1987-05-18 1988-11-22 Shinko Electric Co Ltd 交差磁界による薄板の加熱装置
US4920475A (en) * 1988-03-07 1990-04-24 California Institute Of Technology Integrated traction inverter and battery charger apparatus
JPH05190268A (ja) * 1992-01-10 1993-07-30 Fuji Electric Co Ltd 多連口レンジ用電磁誘導加熱装置

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103444261A (zh) * 2011-03-31 2013-12-11 Bsh博世和西门子家用电器有限公司 家用器具装置
CN103444261B (zh) * 2011-03-31 2016-02-10 Bsh家用电器有限公司 家用器具装置
EP4657981A1 (de) * 2024-05-30 2025-12-03 Whirlpool Corporation Induktionsschaltung für ein kochfeld

Also Published As

Publication number Publication date
ES2128941A1 (es) 1999-05-16
ES2128941B1 (es) 2000-01-16
DE69726057D1 (de) 2003-12-18
EP0817531A2 (de) 1998-01-07
DE69726057T2 (de) 2004-09-02
EP0817531A3 (de) 1998-04-08

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