EP2605614A1 - Vorrichtung zur Stromversorgung über einen Wechselrichter, insbesondere für ein Induktionskochgerät - Google Patents
Vorrichtung zur Stromversorgung über einen Wechselrichter, insbesondere für ein Induktionskochgerät Download PDFInfo
- Publication number
- EP2605614A1 EP2605614A1 EP12195871.4A EP12195871A EP2605614A1 EP 2605614 A1 EP2605614 A1 EP 2605614A1 EP 12195871 A EP12195871 A EP 12195871A EP 2605614 A1 EP2605614 A1 EP 2605614A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- supply device
- switching transistors
- transistors
- power
- igbt
- 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
- 230000006698 induction Effects 0.000 title claims abstract description 23
- 238000010411 cooking Methods 0.000 claims abstract description 48
- 239000004020 conductor Substances 0.000 claims abstract description 6
- 230000001939 inductive effect Effects 0.000 description 22
- 238000010438 heat treatment Methods 0.000 description 6
- 239000003990 capacitor Substances 0.000 description 4
- 230000006378 damage Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000001965 increasing effect Effects 0.000 description 2
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 239000002241 glass-ceramic Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000007650 screen-printing Methods 0.000 description 1
Images
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
-
- 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 present invention relates to an inverter supply device of inductive means integrated in a resonant circuit.
- the present invention relates to the field of induction cooking appliances in which each zone or cooking zone is controlled by a single power element integrated in an inverter supply device.
- inverter supply device is described in particular in the document WO 2007/042315 wherein the induction means integrated with a resonant circuit are fed from an inverter supply device having a switching transistor of the type of a voltage controlled transistor known as IGBT (acronym for the term English “Insulated Gate Bipolar Transistor "), in series with the resonant circuit.
- IGBT acronym for the term English "Insulated Gate Bipolar Transistor"
- This type of topology is called a single-transistor or quasi-resonant topology and corresponds to a quasi-resonant mounting of the inverter supply device.
- the switching transistor is itself connected in parallel with a freewheeling diode.
- Such an inverter supply device operates according to a switching frequency of the transistor, corresponding to a control period T.
- This switch is also associated with a cyclic conduction ratio ⁇ , ⁇ ⁇ 1, defined so that the transistor is switched to the ON position for a duration ⁇ T of the control period.
- This duration ⁇ T thus corresponds to the conduction period of the transistor and the freewheeling diode for each control period T.
- the instantaneous power induced in a container placed at the rights of the inductor means is limited by a maximum continuous power and a minimum continuous power related to the operation of the switching transistor, of the IGBT type.
- the continuous minimum power that can be induced in the container by an inductor in a continuous manner is limited by the topology of the switching transistor, and in particular by the current peak generated in the IGBT when the ON of the transistor.
- the maximum continuous power that can be induced in a given container is limited by the maximum allowable voltage between the terminals of the transistor, that is to say between the collector and the issuer of the IGBT.
- an increase in the power induced by the inductor means in a container necessarily implies an increase in the current and the voltage across the transistor.
- the maximum permissible voltage across the IGBT necessarily forces the induced power in the container.
- the power generated by an inductor controlled in commutation by such an inverter supply device is of the order of 2300 W.
- This maximum power for a given container can be calculated by determining the maximum current flowing in the inductor without the voltage between the collector and the emitter of the switching transistor does not exceed the maximum allowable voltage.
- the induced power then depends on this maximum current and the load resistance associated with the container.
- IGBT-type switching transistors having a maximum permissible voltage greater than 1200 V, for example of the order of 1600 V, are known.
- the transistor Since the voltage between the collector and the emitter is very large, the transistor will heat up when the current flows through it, this heating being able to lead to the thermal destruction of this electronic component.
- This type of transistor is therefore not suitable for large current flow, which would allow the generation of a high induced power in the container.
- the present invention aims to solve the aforementioned drawbacks and to provide an inverter supply device for increasing the power induced by inductor means in a container.
- the present invention relates to an inverter supply device with inductor means integrated in a resonant circuit, the inverter supply device having a quasi-resonant topology.
- the inverter supply device comprises at least two switching transistors connected in parallel, the switching transistors being connected in series with the inductor means.
- the switching transistor parallel connection allows the passage of a large electrical current in the circuit when the current electrical distribution is distributed in the two switching transistors connected in parallel.
- the power induced in a container can thus be increased while maintaining a quasi-resonant topology of the inverter supply device, of the same type as that used to drive inductive means by a single electronic power component.
- the switching transistors are respectively connected in parallel with freewheeling diodes.
- a same switching control signal is addressed to the gate of the switching transistors.
- the switching control of the switching transistors connected in parallel is performed at the same frequency and in phase.
- the switching transistors are components mounted on a printed circuit board, the collectors of the switching transistors being interconnected by a track of conductive material deposited on the printed circuit board.
- the switching transistors are components mounted on a printed circuit board, the printed circuit board comprising an attached conductor wire connecting the commutators of the transistors in commutation.
- This technology makes it possible to mass-produce on a printed circuit board several inverter power supply devices according to the quasi-resonant topology, the parallel connection of two switching transistors that can be realized on a case-by-case basis for the control at a high speed.
- the power of some induction hobs by using as an accessory a conductive wire which is connected to the collectors of the transistors in switching at the time of mounting the printed circuit board in an induction cooking appliance.
- the printed circuit board can thus be standardized, requiring fewer references for the manufacture of induction cooking appliances.
- the present invention also relates to an induction cooking appliance, comprising at least one cooking zone comprising inductive means integrated in a resonant circuit.
- This cooking appliance comprises an inverter supply device according to the invention.
- This cooking appliance has characteristics and advantages similar to those described above in connection with the inverter supply device.
- this cooking appliance may be an induction hob 10 comprising at least one cooking zone comprising inductive means.
- the hob 10 has four cooking bursts F1, F2, F3, F4, each cooking zone having inductive means.
- These inductive means typically comprise one or more induction coils connected in series.
- This hob 10 conventionally comprises a power supply phase 11, typically a mains power supply.
- the hob 10 is supplied with 32 A, which can provide a maximum power of 7200 W at the hob 10, a power of 3600 W per phase.
- the inductive means associated with each cooking zone F1, F2, F3, F4 can in practice be made from one or more induction coils in which the electric current flows, these coils being mounted on the same power phase. .
- a power control card 12 makes it possible to support all the electronic and computer means necessary for controlling the hob, and in particular the inverter supply device for the inductor means which will be described later.
- the hob 10 could include several power control cards for distributing all the electronic and computer means necessary for the control of this hob.
- electrical connections 13 are provided between this power control board 12 and each cooking zone F1, F2, F3, F4.
- the power control card 12 is conventionally made from a printed circuit board.
- all the inductor means constituting each focus F1, F2, F3, F4 and the power control board 12 are placed under a flat cooking surface, for example made from a glass-ceramic plate.
- the firing heaters F1, F2, F3, F4 can also be identified by screen printing vis-à-vis the inductor means constituting each cooking chamber, and placed under the flat cooking surface.
- cooktop 10 in which four cooking zones constituting cooking heaters F1, F2, F3, F4 are predefined in the hob
- the present invention applies also to a hob having a variable number or different forms of cooking hobs, or, having a hob without predefined zone or cooking zone, the latter being defined case by case by the position of the container screwed to a subset of induction coils arranged under the cooking plane.
- the hob 10 also comprises control and interface means 14 with the user allowing the user to control in power and duration the operation of each focus F1, F2, F3, F4.
- the user can through the control and interface means 14 assign a set power to each cooking hearth covered with a container.
- Such an inverter supply device 20 is adapted to feed one of the cooking hobs F1, F2, F3, F4 of the hob 10, and for example the cooking zone F1, it being understood that each cooking zone may have the same power scheme.
- an inductor L1 represents both the inductance of the inductive means of the cooking chamber F1 and that of a heating vessel placed opposite, at the cooking zone F1.
- the system consisting of a container and the induction means of the cooking chamber F1 comprises in series with the inductance L1 a resistance, mainly characterizing the resistance of the container.
- the inductive means L1 are integrated in a resonant circuit, thus comprising a capacitor C1 mounted in parallel with the inductor L1 and the resistor.
- the inverter power supply device 20 as illustrated in FIG. figure 2 comprises two switching transistors T1, T2 connected in parallel.
- These switching transistors T1, T2 are also connected in series with the inductor means L1.
- the switching transistors T1, T2 are here as non-limiting examples of the voltage-controlled transistors, commonly known as IGBT ( Insulated Gate Bipolar Transistor ).
- the switching transistors T1, T2 of the IGBT switches T1, T2 will be referred to below.
- Each IGBT switch T1, T2 is connected in parallel with a freewheeling diode D1, D2.
- the collectors C of the two IGBT switches T1, T2 are electrically connected to one another and connected at a supply node N of the inductive means L1 .
- the emitters E of the IGBT switches T1, T2 are also electrically connected to each other and grounded.
- This control signal is addressed to the gate G of the two IGBT switches T1, T2.
- Non-limiting examples will be given hereinafter of comparative examples of operation and generated power, for an inverter supply device comprising a single switching transistor or two switching transistors connected in parallel.
- an inverter supply device implementing only a single switching transistor is identical to that described in FIG. figure 2 , the assembly comprising only one switching transistor, and for example the IGBT switch T1 connected in parallel with the freewheeling diode D1.
- the average current flowing in the inductor means L1 is equal to about 30 A.
- the average current I MOY IGBT in the IGBT switch T1 is equal to approximately 15 A whereas the average current I MOY DIODE in the freewheeling diode D1 is substantially equal to 10 A.
- the losses in the IGBT switch T1 equal to V CE SAT x I MOY IGBT , are substantially equal to 28 W.
- the losses in the freewheeling diode D1 equal to V F ⁇ I MOY DIODE are substantially equal to 17 W.
- the total losses in the IGBT switch T1 connected in parallel with the freewheeling diode D1 are therefore equal to approximately 45 W.
- the heating associated with these losses in the IGBT switch T1 and the freewheeling diode D1 is thus moderate, so that the temperature of the electronic component stabilizes around 85 ° C after a few minutes.
- IGBT switch T1 having a maximum continuous voltage of 1200 V is compatible with the generation of a moderate power of the order of 2300 W in the inductive means L1.
- the voltage between the collector C and the emitter E of a mounted IGBT switch T1 in series with the inductive means L1 is of the order of 1350 V, which prohibits the use of an IGBT switch T1 having a maximum voltage between collector C and emitter E of 1200 V.
- the following describes, as a comparative example, the implementation of an inverter supply device comprising a single switching transistor using the IGBT switch T1 having a maximum voltage between collector C and emitter E greater than 1200 V.
- the average current flowing in the inductive means L1 is about 35A.
- the average current I MOY IGBT flowing in the IGBT switch T1 is then of the order of 17.5 A, while the average current I MOY DIODE flowing in the freewheeling diode D1 is equal to 12.5 A approximately.
- the losses in the IGBT switch T1 equal to V CE SAT ⁇ I MOY IGBT , are substantially equal to 39 W while the losses in the freewheeling diode D1, equal to V F ⁇ I MOY DIODE , are substantially equal to 25W.
- the total losses in the electronic power component are then equal to about 64 W.
- the temperature of the electronic power component does not stabilize, which causes its destruction after a few minutes.
- the IGBT switches T1, T2 have a maximum voltage between collector and transmitter V EC MAX of the order of 1600 V
- the values given above for the voltage V CE SAT between the collector C and the emitter E and the voltage V F across the freewheeling diode are likewise applicable to the two IGBT switches T1, T2 associated respectively with the two freewheeling diodes D1, D2.
- the average current in the inductive means L1 is of the order of 35 A.
- the average current I MOY IGBT in each IGBT switch T1, T2 is substantially equal to 8.75 A, while the average current I MOY DIODE flowing in each diode D1, D2 is of the order of 6.25 AT.
- the average current flowing in the inductor means L1 is distributed over the two IGBT switches T1, T2 connected in parallel.
- each IGBT switch T1, T2 are limited to about 19.5 W while the losses in each diode D1, D2 are substantially equal to 12.5 W.
- the parallel connection of two transistors T1, T2 can be realized in different ways.
- the IGBT switches T1, T2 are power components of this printed circuit board.
- the simplest way to perform the paralleling of these components is to connect the collectors C IGBT switches T1, T2 by a conductive material track, for example a copper track deposited on the printed circuit board.
- This embodiment thus makes it possible to produce quasi-resonant topologies in series, the two-to-two parallel connection of the switching transistors T1, T2 being able to be realized on a case-by-case basis by making the connection between the collectors of the transistors with a tracking track.
- the printed circuit board may comprise eight IGBT type switching transistors and provide four power outputs.
- the switching transistors can be mounted in pairs as shown in FIG. figure 2 and thus define high-power cooking stoves.
- the printed circuit board can be standardized at locations for receiving the different switching transistors and different conductive tracks.
- the transistors T1, T2 are simply or in parallel, the transistors T1, T2 are not mounted or mounted at the different locations.
- an accessory wire 31 adapted to connect the collectors C of the two IGBT switches T1, T2, themselves forming components of the printed circuit board, can be used as an accessory.
- This conductive wire 31 may be for example a copper wire and is attached to the printed circuit board.
- the two IGBT switches T1, T2 are independent and can drive each inductor means L1, L2 integrated in a resonant circuit consisting of a capacitor C1, C2 connected in parallel with the inductor means L1, L2 and the resistance of a container disposed opposite the inductive means L1, L2.
- the power induced by the inductor means L1, L2 then remains less than 2300 W, each inductor means L1, L2 being controlled by a single switching transistor T1, T2.
- each switching transistor T1, T2 can be controlled by an independent control signal, including different frequencies.
- the second inductor means L2 and the second capacitor C2 connected in parallel are connected in series with the collectors C of the two switching transistors T1, T2.
- the maximum power that can thus be induced in a container placed above the second inductor means L2 may be greater than 2300 W, and for example of the order of 3000 W.
- the printed circuit board may have four IGBT type switching transistors and provide four power outputs for supplying four cooking stoves.
- two switching transistors T1, T2 are connected together as shown in FIG. figure 3B by means of a conductive wire 31 attached to the printed circuit board so as to define a high power cooking hearth.
- the printed circuit board comprises four switching transistors of the IGBT type and provides three power outputs for supplying three cooking stoves, where two cooking stoves are conventionally powered by a single transistor as illustrated in FIG. figure 3A , and where a high-power cooking hearth is powered by two parallel-connected transistors as illustrated in FIG. figure 3B .
- the printed circuit board can be standardized at locations for receiving the different switching transistors and different conductive tracks.
- the inverter supply device could comprise a number greater than two of switching transistors T1, T2 connected in parallel.
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Inverter Devices (AREA)
- Induction Heating Cooking Devices (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1161537A FR2984038B1 (fr) | 2011-12-13 | 2011-12-13 | Dispositif d'alimentation a onduleur, notamment pour appareil de cuisson a induction |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2605614A1 true EP2605614A1 (de) | 2013-06-19 |
EP2605614B1 EP2605614B1 (de) | 2017-10-04 |
Family
ID=47278201
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP12195871.4A Active EP2605614B1 (de) | 2011-12-13 | 2012-12-06 | Vorrichtung zur Stromversorgung über einen Wechselrichter, insbesondere für ein Induktionskochgerät |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP2605614B1 (de) |
ES (1) | ES2645225T3 (de) |
FR (1) | FR2984038B1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3419382A1 (de) * | 2017-06-23 | 2018-12-26 | Vestel Elektronik Sanayi ve Ticaret A.S. | Induktionskocher und verfahren zum betrieb |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN106879094B (zh) * | 2015-12-11 | 2023-08-22 | 佛山市顺德区美的电热电器制造有限公司 | 电磁加热装置及其加热控制电路 |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4210792A (en) * | 1976-07-27 | 1980-07-01 | Tokyo Shibaura Electric Co., Ltd. | Induction heating apparatus with load detecting and control circuit |
WO2005043737A2 (de) * | 2003-11-03 | 2005-05-12 | BSH Bosch und Siemens Hausgeräte GmbH | Verfahren zur vermeidung bzw. reduktion von störschall in einer umrichterschaltung bei gleichzeitigem betrieb mehrerer ausgänge |
WO2006092179A1 (de) * | 2005-03-01 | 2006-09-08 | BSH Bosch und Siemens Hausgeräte GmbH | Heizeinrichtung für ein induktionsgargerät |
WO2007042315A1 (de) | 2005-10-14 | 2007-04-19 | E.G.O. Elektro-Gerätebau GmbH | Induktionsheizeinrichtung sowie verfahren zum betrieb einer solchen |
EP2200398A1 (de) * | 2008-12-22 | 2010-06-23 | FagorBrandt SAS | Verfahren zur Stromversorgung mit der Leistung von zwei Induktoren und Kochgerät, bei dem dieses Verfahren umgesetzt ist |
-
2011
- 2011-12-13 FR FR1161537A patent/FR2984038B1/fr not_active Expired - Fee Related
-
2012
- 2012-12-06 ES ES12195871.4T patent/ES2645225T3/es active Active
- 2012-12-06 EP EP12195871.4A patent/EP2605614B1/de active Active
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4210792A (en) * | 1976-07-27 | 1980-07-01 | Tokyo Shibaura Electric Co., Ltd. | Induction heating apparatus with load detecting and control circuit |
WO2005043737A2 (de) * | 2003-11-03 | 2005-05-12 | BSH Bosch und Siemens Hausgeräte GmbH | Verfahren zur vermeidung bzw. reduktion von störschall in einer umrichterschaltung bei gleichzeitigem betrieb mehrerer ausgänge |
WO2006092179A1 (de) * | 2005-03-01 | 2006-09-08 | BSH Bosch und Siemens Hausgeräte GmbH | Heizeinrichtung für ein induktionsgargerät |
WO2007042315A1 (de) | 2005-10-14 | 2007-04-19 | E.G.O. Elektro-Gerätebau GmbH | Induktionsheizeinrichtung sowie verfahren zum betrieb einer solchen |
EP2200398A1 (de) * | 2008-12-22 | 2010-06-23 | FagorBrandt SAS | Verfahren zur Stromversorgung mit der Leistung von zwei Induktoren und Kochgerät, bei dem dieses Verfahren umgesetzt ist |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3419382A1 (de) * | 2017-06-23 | 2018-12-26 | Vestel Elektronik Sanayi ve Ticaret A.S. | Induktionskocher und verfahren zum betrieb |
Also Published As
Publication number | Publication date |
---|---|
FR2984038A1 (fr) | 2013-06-14 |
EP2605614B1 (de) | 2017-10-04 |
FR2984038B1 (fr) | 2018-09-21 |
ES2645225T3 (es) | 2017-12-04 |
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