EP0817531B1 - Flexible and re-configurable topology - Google Patents
Flexible and re-configurable topology Download PDFInfo
- 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
- Authority
- 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
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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)
Description
-
S 1 to S6 as the power semiconductor switches. - The leg formed by S3 and S4 are the so called common leg of the three-phase bridge.
- The leg formed by S1 and S2 are the so called the booster leg of the three-phase bridge.
- The leg formed by S5 and S6 are the so called the fixed leg of the three-phase bridge.
-
B 1 is the coil without power boost. - B2 is the coil with power boost.
- R1 is the single-pole two-positions switch.
- Vd is a generic DC current or voltage power source, obtained by rectifying an AC power source, either filtered or not, being the filter active or passive whether applicable, without any limitation introduced by the nature of the power source.
- R2 is the second single-pole two-positions switch incorporated to the topology.
Claims (14)
- Electric circuit comprising a three-phase bridge (S1 - S2, S3 - S4, S5 - S6) to drive two loads (B1, B2) connected between a first connection (+) of a common power source with a voltage (Vd) for supplying power to the loads (B1, B2) and a second connection (-) wherein the bridge (S1 - S2, S3 - S4, S5 - S6) comprises a first switch (R1) to drive one (B2) of the loads (B1, B2) at its nominal rate of 100 % or at a power higher than its nominal power in dependence of the position (no; nc) of the first switch (R1).
- Electric circuit according to claim 1 wherein the loads (B1, B2) are two coils.
- Electric circuit according to claim 2 wherein the coils (B1, B2) constitute two heating plates of an induction cooking hob.
- Electric circuit according to one of the preceding claims allowing, when the first switch (R1) is not activated, to drive both loads (B1, B2) independently (no ).
- Electric circuit according to one of the claims 1 to 3 allowing, when the first switch (R1) is activated, two legs of the bridge (S1 - S2, S3 - S4, S5 - S6) to be connected in parallel, the drive capacity being the addition of the drive capacity of both said legs connected in parallel (nc ).
- Electric circuit according to one of the preceding claims allowing a modular design building up with it an induction module to drive two coils (B1, B2) used as heating plates of an induction hob wherein power boost of one of the coils (B1, B2) is available.
- Electric circuit according to claim 6 allowing the modular design to be incorporated in a mixed induction and non-induction hob with two induction heating plates wherein power boost of one of the coils (B1, B2) is available.
- Electric circuit according to claim 6 allowing two of the modular designs to be incorporated in a four heating plates induction cooking hob wherein power boost of two of them is available.
- Electric circuit according to claim 1 wherein the bridge (S1 - S2, S3 - S4, S5 - S6) comprises the first (R1) and a second switch (R2) to drive both loads (B1, B2) at their nominal rate (100 %) or one (B1, B2) of the loads (B1, B2) at a power (> 100 %) higher than its nominal power in dependence of the position (no; nc) of the switches (R1, R2).
- Electric circuit according to claim 9 allowing the modular design to be incorporated in an induction hob with two induction heating plates wherein all the installed power for both loads (B1, B2) is used for driving any of them, without distinction.
- Electric circuit according to claim 9 allowing the modular design having two heating plates with power boost capacity.
- Electric circuit according to claim 9 allowing the modular design building up with it an induction module to drive two coils (B1, B2) used as heating plates of an induction hob wherein both heating plates have power boost capacity.
- Electric circuit according to claim 9 allowing the modular design to be incorporated in a mixed induction and non-induction hob with two induction plates wherein both induction heating plates have power boost capacity.
- Electric circuit according to claim 9 allowing the modular design to be incorporated in a four heating plates induction cooking hob wherein all heating plates have power boost capacity.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ES9601437 | 1996-06-26 | ||
ES9601437A ES2128941B1 (en) | 1996-06-26 | 1996-06-26 | INVERTER CIRCUIT OF VARIABLE CONFIGURATION. |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0817531A2 EP0817531A2 (en) | 1998-01-07 |
EP0817531A3 EP0817531A3 (en) | 1998-04-08 |
EP0817531B1 true EP0817531B1 (en) | 2003-11-12 |
Family
ID=8295307
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19970500109 Expired - Lifetime EP0817531B1 (en) | 1996-06-26 | 1997-06-25 | Flexible and re-configurable topology |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0817531B1 (en) |
DE (1) | DE69726057T2 (en) |
ES (1) | ES2128941B1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103444261A (en) * | 2011-03-31 | 2013-12-11 | Bsh博世和西门子家用电器有限公司 | Domestic appliance device |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ITPN20020043A1 (en) * | 2002-06-19 | 2003-12-19 | Electrolux Home Products Corpo | INDUCTION HOB. |
ES2211303B1 (en) * | 2002-08-01 | 2005-10-01 | Bsh Electrodomesticos España, S.A. | INDUCTION KITCHEN PLATE WITH RECONFIGURABLE STRUCTURE WARMING AREAS AND PROCEDURE TO INCREASE THE MAXIMUM POWER OF SUCH WARMING ZONES. |
DE602007003672D1 (en) * | 2007-01-23 | 2010-01-21 | Teka Ind Sa | Method for controlling an induction hob and induction hob adapted to carry out this method |
ES2575091T3 (en) * | 2011-03-30 | 2016-06-24 | BSH Hausgeräte GmbH | Induction heating device |
EP2692205A1 (en) * | 2011-03-31 | 2014-02-05 | BSH Bosch und Siemens Hausgeräte GmbH | Induction heating device |
GB202216117D0 (en) * | 2022-10-31 | 2022-12-14 | Nicoventures Trading Ltd | Inductive heating |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3224738C1 (en) * | 1982-07-02 | 1984-02-09 | Aeg-Elotherm Gmbh, 5630 Remscheid | Device for inductive heating of a workpiece by means of several inductors |
US4885447A (en) * | 1985-01-23 | 1989-12-05 | Balay, S.A. | System for the induction heating of the electric plates of a cooker |
DE3712242A1 (en) * | 1987-04-10 | 1988-10-27 | Thomson Brandt Gmbh | CIRCUIT FOR POWERING AN INDUCTIVE COOKING POINT |
JPS63285894A (en) * | 1987-05-18 | 1988-11-22 | Shinko Electric Co Ltd | Heating device for thin plate by cross magnetic field |
US4920475A (en) * | 1988-03-07 | 1990-04-24 | California Institute Of Technology | Integrated traction inverter and battery charger apparatus |
JPH05190268A (en) * | 1992-01-10 | 1993-07-30 | Fuji Electric Co Ltd | Electromagnetic induction heating device for multiport range |
-
1996
- 1996-06-26 ES ES9601437A patent/ES2128941B1/en not_active Expired - Fee Related
-
1997
- 1997-06-25 DE DE1997626057 patent/DE69726057T2/en not_active Expired - Lifetime
- 1997-06-25 EP EP19970500109 patent/EP0817531B1/en not_active Expired - Lifetime
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103444261A (en) * | 2011-03-31 | 2013-12-11 | Bsh博世和西门子家用电器有限公司 | Domestic appliance device |
CN103444261B (en) * | 2011-03-31 | 2016-02-10 | Bsh家用电器有限公司 | Home appliance device |
Also Published As
Publication number | Publication date |
---|---|
EP0817531A3 (en) | 1998-04-08 |
ES2128941A1 (en) | 1999-05-16 |
ES2128941B1 (en) | 2000-01-16 |
EP0817531A2 (en) | 1998-01-07 |
DE69726057D1 (en) | 2003-12-18 |
DE69726057T2 (en) | 2004-09-02 |
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