EP1494505B1 - Méthode et dispositif de régulation de puissance pour plaques à inductions - Google Patents

Méthode et dispositif de régulation de puissance pour plaques à inductions Download PDF

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Publication number
EP1494505B1
EP1494505B1 EP04405263A EP04405263A EP1494505B1 EP 1494505 B1 EP1494505 B1 EP 1494505B1 EP 04405263 A EP04405263 A EP 04405263A EP 04405263 A EP04405263 A EP 04405263A EP 1494505 B1 EP1494505 B1 EP 1494505B1
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EP
European Patent Office
Prior art keywords
inductor
control
length
energy
period
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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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EP04405263A
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German (de)
English (en)
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EP1494505A2 (fr
EP1494505A3 (fr
Inventor
Heinrich Weder
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Elatronic AG
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Elatronic AG
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Publication of EP1494505A3 publication Critical patent/EP1494505A3/fr
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    • 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 a method for power regulation of induction cookers with a plurality of cooking zones, each of these cooking zones having an inductor, and a device for carrying out this method.
  • a cooking device generally has at least two juxtaposed induction hotplates, one of which comprises an inductor.
  • the heating or heating of the vessel with the food is known to be done by induction of eddy currents in a vessel.
  • One of the basic conditions for the induction of eddy currents in the vessel is an alternating electromagnetic field. This is generated in the cooking zone of an induction cooker by means of a time-varying electric current through the cooking zone, which is one of the components of an electrical resonant circuit. This resonant circuit is excited by a clock source and it generates the necessary for the induction of eddy currents in the vessel alternating current.
  • the cooking or cooking operations require that different amounts of energy to be supplied to the adjacent cooking vessels. Therefore, known induction cookers also have the ability to control the amount of energy supplied to the cooking vessels.
  • This power control or regulation can basically be done in two ways. On the one hand, the power control or regulation can be achieved by changing the frequency of the current flowing in the inductor resonant circuit electrical current. The range of these frequencies is usually between 22KHz and 45KHz, ie in a range which is above the range of audible frequencies. On the other hand, the power control or regulation can be effected by changes in the duration or length or width of the current pulses flowing through the inductor.
  • This electromagnetic induction cooker includes a resonant circuit having an induction coil to which a cookware, such as a pan, can be assigned.
  • the variable electromagnetic field generated in the induction coil and acting on the cookware induces eddy currents in the cookware, which, due to the ohmic resistance, produce the heat required for the cooking or cooking process in the cookware.
  • a transistor is arranged, which is turned on via a control signal, that is made conductive, or turned off, that is made non-conductive.
  • the energy averaged over time ie the average power supply to the coil and thus to the cookware, can be adjusted.
  • a pulse width control device is provided in this induction cooker. Since the induction coil is connected in series with only one transistor switch in this induction cooker, only current pulses in a current direction can be generated in the coil.
  • the object of the present invention is to eliminate the mentioned disadvantage as well as other disadvantages of the known induction cookers.
  • the respective cooking point 3 further comprises a drive device or a power source 4 for the induction hotplate 5 (FIG. Fig. 2 ).
  • This drive device 4 includes an inverter 8 and a control device 9 for the inverter 8.
  • the inductor 13 of the respective juxtaposed cooking zones 3 is connected to a separate and controllable source 4, from which the inductor 13 can be energized.
  • control device 9 is inter alia a microprocessor 10, in which, among other programs can be stored, which the course of each applied Gar-. or cooking process can control.
  • the operation of the microprocessor 10 can by means of a in Fig. 2 only schematically indicated operating device 23 can be influenced.
  • This device 23 includes, inter alia, a component above which values can be entered by the operator for the desired cooking process.
  • Corresponding operating devices are available on the market and belong to the state of the art. Typically, potentiometers or tiptasts with electronic control logic are used for such function.
  • the microprocessor 10 is provided with a technical interface 24 for the connection of further devices (not shown), by means of which the microprocessor 10 can be programmed, for example.
  • the technical interface 24 is designed as a bidirectional communication interface. This interface can operate according to a valid standard such as RS-232, RS-485, Ethernet, USB or similar.
  • proprietary control lines are available via which synchronization points, alarm signals or control signals of the method can be queried.
  • the microprocessor 10 is connected via a control bus 22 to a device 20 for processing the output from the microprocessor 10 control signals.
  • the signal processing device 20 may be implemented as a standard module in which a custom electronic circuit is programmed. A PGA is preferred or an equivalent building block can be used.
  • This processing device 20 is connected via control lines 7A and 7B to the corresponding inputs A and B of the inverter 8.
  • the inverter 8 represents a controlled power stage of the present device. This means that the inverter 8 can control the current flow through the inductor 13 on the basis of the pulses supplied to it by the microprocessor 10.
  • the inductor 13, which is designed as a coil, together with at least one capacitor 15 or 16 forms a resonant circuit.
  • the induction coil 13 and the capacitor 15 and 16 are designed so that the parameters thereof are not changeable. These parameters are chosen so that the resonant frequency of this resonant circuit is well below the operating frequency of 22kHz of this submission for all power regulation ranges.
  • the resonant frequency of the resonant circuit can be in the range between 16 and 20 kHz.
  • the inductor 13 thus represents a central component of the inverter 8, by means of which energy can be transmitted to the cooking vessels 6.
  • the inductor resonant circuit is formed bridge-like.
  • One of the branches of this bridge form the series-connected capacitors 15 and 16.
  • the free electrode of the first capacitor 15 is connected to the positive terminal of a source DC of the supply voltage.
  • the free electrode of the other capacitor 16 is connected to the negative terminal of the source DC of the supply voltage.
  • the opposite branch of the bridge form two series-connected power switching elements 25 and 26, which also belong to the resonant circuit and which are transistors in the illustrated case.
  • the collector of the first transistor 25 is connected in the illustrated case to the positive terminal of the voltage source DC.
  • To the base of this first transistor 25 is the first and received by the signal processing device 20 incoming control line 7A connected.
  • the emitter of this first transistor 25 is connected to the collector of the second transistor 26.
  • the second and from the signal processing device 20 incoming control line 7B is connected.
  • the emitter of this second transistor 26 is connected to the negative terminal of the voltage source DC.
  • the series-connected capacitors 15 and 16 have a tapping point 18 which lies between the interconnected electrodes of the capacitors 15 and 16. At this center tap point 18, one of the ends or connecting conductor 14 of the inductor coil 13 is connected. Between the emitter of the first power semiconductor 25 and the collector of the second power semiconductor 26, a further point 19 is present. At this center tap point 19, the second end and the second terminal conductor 17 of the inductor coil 13 is connected.
  • the power semiconductors 25 and 26 are designed as bipolar transistors. In particular, however, also embodiments with related power semiconductors are conceivable, such as e.g. IGBTs (Insulated gate bipolar transistors), MOS-FET transistors, thyristors, GTO's and triacs.
  • In the inverter 8 further sensors for the temperature monitoring of the power electronics and the vessel 6 and devices for measuring the current through the inductor 13 and the current performance of the inductor 5 are integrated (not shown). The results provided by these monitoring devices are fed back to the microprocessor 10 via the measuring leads 11.
  • These measuring lines 11 are signal lines which connect the inverter 8 to the microprocessor 10 and which are designed so that either digital or analog measured values from the inverter 8 in the Microprocessor 10 can be transmitted.
  • These signal lines 11 may include dedicated wire lines and a digital control bus.
  • the supply of the respective inductor 13 with energy takes place in pulses and periodically. This means that energy is supplied to the inductor 13 in the form of pulses and that these pulses are within successive or repetitive periods or time windows.
  • This situation is in Fig. 3, 4 and 5 illustrated by diagrams.
  • the time t is plotted on the X-axis of the respective diagram.
  • the individual periods or time windows of the energy supply to the inductors 13 are in all three superimposed Fig. 3 to 5 separated from each other by means of perpendicular to the X-axis and superimposed lines L.
  • a period or a time window is therefore designated LL in the following.
  • the time slots LL have the same length or width for all inductors 13. In addition, the beginnings and ends of the time slots are practically at the same time L.
  • the length or width of the repetitive time slots LL is expressed as Tmax ( Fig. 4 ) designated.
  • the length of the time window Tmax is the same for all cooking zones 3, so that the repetition frequency of feeding the neighboring inductors 13 with energy is practically the same for all inductors 13.
  • the Tmax is also constant for all inductors 13, ie invariable, and moreover chosen so that the length of Tmax corresponds to the period of the frequency of about 22kHz. This frequency corresponds to the operating frequency of about 22 kHz of the inductor resonant circuit in the inverter 8.
  • the inductors 13 of all cooking zones 3 are supplied in this frequency or frequency with the energy pulses.
  • the actual control of the power of the inductors 13 is, as already mentioned, by a pulse-like conduction of current I through the inductors 13 of the cooking zones 3 within the time window LL.
  • the electric power delivered to the respective inductor 13 is determined not only by the magnitude of the current I flowing through the coil 13, but also by that period of time during which this current I flows through the coil 13.
  • the period of time during which the current I flows through the inductor 13 is virtually identical to that period during which the relevant controllable switch 25 or 26 in the inverter 8 is conducting. Therefore, the timing of the current I through the inductor 13 can be described in connection with the timing of those pulses and those voltages A and B, which control the opening of the switching elements 25 and 26.
  • the parameters of the inverter 8 determine how large the current I is, which flows through the inductor 13 during the time period TA and TB, after the relevant switch 25 or 26 has been made conductive.
  • the course of the inductor 13 supplied power is in Fig. 5 represented by the line W. In 3 and 4 appropriate lines W could be located.
  • the current I may have a constant value during the periods TA and TB in the present case.
  • the impulse A in Fig. 3 to 5 shows the time course of that control voltage US during a time window LL, which is applied via the line 7A to the base of the first transistor 25.
  • the momentum B in Fig. 3 to 5 which follows the first pulse A, shows the time profile of that control voltage US during a time window LL, which is applied via the line 7B to the base of the second transistor 26.
  • the drive signals A and B are practically rectangular signals.
  • the size of the control voltages US is between 0 volts and a maximum appropriate drive voltage US, which is useful for the operation of the switches 25 and 26. These control pulses A and B have the same polarity.
  • the generation of the first control pulse A always begins at the beginning or shortly after the beginning of the respective time window LL or the respective period Tmax, i. at the time 0 of the time slot LL or shortly thereafter, regardless of how long the pulses A and B last.
  • the control pulse B is generated after the pulse A, and only after the lapse of a short period, which is between these two pulses and which is related to the discharge times in the switches 25 and 26.
  • Fig. 3 shows the length TA and TB of the control pulses A and B for the maximum supply of the inductor 13 with energy.
  • Fig. 5 shows the length TA and TB of the control pulses A and B for a minimum supply of the inductor 13 with energy.
  • Fig. 4 shows the length TA and TB of the control pulses A and B for a middle power range of the inductor 13.
  • Tmax which corresponds to the length of the time window LL.
  • the sum S of the two durations TA and TB is always smaller than Tmax.
  • the first control pulse A makes the transistor 26 conductive and the current I in this case flows from the negative terminal DC- through this transistor 26, the intermediate tap between the transistors 25 and 26 19, the coil 13, lying between the capacitors 15 and 16 Center tap 18 and the capacitors 15 and 16 to the positive terminal DC + the DC voltage source DC.
  • a pulse B passes via the line 7B to the base of the other transistor 25 and makes it conductive.
  • the current I now flows from the positive terminal DC + through this transistor 25, the transistor center tap 19, the coil 13, but now in the opposite direction, the capacitor center tap 18 and the capacitors 15 and 16 to the minus terminal DC- of the DC voltage source DC.
  • the time period TA or TB could be virtually zero for power regulation. However, for technical reasons, this choice does not make much sense.
  • a sum S of TA and TB is preferred, which corresponds to the period length Tmin of a frequency.
  • the present method offers not only the advantage that the power in each hob 3 can be controlled individually, but also the important advantage that the supply network for the electrical energy is not pulsed but continuously charged. This is because the TA and TB are extended and shortened simultaneously and always by the same amount. This is important because the cooking stations 3 usually draw several amperes of power from the supply network at their peak outputs.
  • the present method can also be carried out in a controlled manner by measuring signals via the measuring lines 11 to the microprocessor 10th be forwarded.
  • the microprocessor 10 controls the magnitude of the inductor current I, its zero crossing, the timing for the switching of the control lines 7A and 7B, etc., based on measured values from the measuring lines 11.
  • the entire cooking process can also be monitored and regulated in this way.
  • a large saucepan 6 filled with water requires a different kind of operation than the cooking zone 3, for example a frying pan with a fried egg.
  • no cooking process may be started when other metallic objects such as a fork or a wooden spoon are on the stove.
  • An extension of the present method is that the nature of the vessel 6 is continuously detected on the stove plate 2 via measuring pulses.
  • the control pulses A and B for the switches 25 and 26 are preceded by pulses (not shown) whose length is smaller than the length of the control pulses A and B.
  • These measuring pulses arrive in the manner described for the control pulses A and B. Way to the inductor 13 of the hob plate 2, on which the cooking vessel 6 rests. According to the nature of this cooking vessel 6, the measuring pulses are influenced and such a response then passes via one of the measuring lines 11 to the microprocessor 10, which among other things controls the operation of the inverter 8.
  • Fig. 8 two diagrams relating to this issue are superimposed.
  • the control voltage US for the switches 25 and 26 is discharged.
  • the current IS is discharged through the inductor 13.
  • Fig. 8 It can be seen that there can be a phase shift between the coil current IS and the control voltage US. The size of this phase shift depends on the type or quality of the vessel or of the object located on the stove top 2 dependent.
  • the magnitude of the phase shift is determined by the inductor 13 over the time difference DT between the zero crossing of the control voltage US and the zero crossing of the current IS. The smaller this time difference DT, the better the quality of the vessel 6, so that a cooking process can be started by the inverter 8.
  • the control device 9 takes the inverter 8 and thus also plate 5 is not in operation or it turns off the inverter 8 and thus also this hotplate 3 off.
  • a collection of corresponding step responses is stored in the memory of the microprocessor 10.
  • a specific time-dependent regulated power control of the cooking process is performed in the memory of the microprocessor.
  • a sequence of time-changeable time intervals TA resp. TB stored in the memory of the microprocessor.
  • the information about the food to be cooked, the cooking progress, etc. are supplied to the microprocessor 10 via the measuring lines 11.
  • external sensors are used, such as an external temperature sensor 27, which can be plugged into the food and which thus the status of the Cooking process via a corresponding measuring line 11 to the microprocessor 10 reports.
  • Fig. 6 shows an embodiment of a supply device 30 for the inductor 13, when the supply of the same is to be made with energy from a three-phase supply network.
  • the feeding device 30 includes, inter alia, three phase terminals L1, L2 and L3 to the utility grid. Connected to the three phase terminals L1, L2 and L3 is a rectifier 28, which is implemented as a three-phase bridge rectifier.
  • This converter converts the AC voltage from the supply network into a DC voltage, which can appear at the output terminals DC + and DC- of this supply device 30.
  • a smoothing capacitor C Between the output terminals DC + and DC- of the three-phase bridge rectifier 28 is a smoothing capacitor C.
  • the DC voltage for the inductor 13 is tapped and by the LC resonant circuit or through the bridge in the inverter. 8 fed to the inductor 13.
  • the feed device 30 may also be configured to limit the power drawn by the present device from the mains. This power limitation is necessary in order to keep the consumption of the stove to energy in the context of the permitted during the building installation energy extraction.
  • a current measuring device 29 is turned on, which is connected upstream of the bridge rectifier 28.
  • the output of the current measuring device 29 is connected to one of the inputs of the control device 9.
  • maximum permissible currents are adjustable in the control device 9 as a control parameter.
  • the control device 9 regulates the maximum power consumption of the inductor 13 in such a way that the maximum power drawn by the building installation nevertheless does not exceed a permissible value.
  • the present device can also be powered from a single-phase network.
  • the feed device 31 has a single-phase bridge rectifier 32, which can be connected via terminals N and L to the single-phase supply network.
  • the current measuring device 29 is located in the connection conductor L in this case.
  • the method according to the invention offers, inter alia, the possibility that the magnitude of the power of the individual cooking zones 3 in an induction cooker 1 can be controlled simultaneously and individually without generating any audible noise, for example whistling sounds, normally caused by interferences between adjacent inductors 13. Consequently, co-located cooking zones 3 can be operated in an induction cooker 1 with different powers, without causing the mentioned noise.
  • the present method provides, inter alia, the advantages that the supply network for electrical energy is charged without power surges and that the cooking process is uniform. The method can also be applied in the case when as Supply voltage for the inverter 8 is intended to serve a multiphase AC voltage.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Induction Heating (AREA)
  • Cookers (AREA)
  • Electric Stoves And Ranges (AREA)
  • Inverter Devices (AREA)
  • Induction Heating Cooking Devices (AREA)

Claims (6)

  1. Procédé de régulation de la puissance d'une table de cuisson à induction avec plusieurs foyers (3), chacun de ces foyers (3) possédant un inducteur (13), caractérisé en ce que le procédé est conçu pour que le réseau d'alimentation soit sollicité de manière continue pour l'alimentation des foyers (3) en énergie électrique, dans lequel les inducteurs (13) individuels sont alimentés en énergie pendant des périodes (LL) successives par des sources (4) asservies autonomes, c'est-à-dire individuelles, isolées des autres, raccordées à chaque inducteur (13) considéré et n'appartenant qu'à celui-ci, la durée (Tmax) des périodes (LL) d'excitation de tous les inducteurs (13) étant identique et l'énergie fournie à l'inducteur (13) considéré étant fournie sous la forme d'une séquence d'impulsions de commande (A, B) toujours de même durée à l'intérieur d'une période (LL), où une première impulsion de commande (A), d'une première durée (TA), produit un premier courant dans l'inducteur (13) et une deuxième impulsion de commande (B), d'une deuxième durée (TB) qui est identique à la première durée (TA), produit un deuxième courant dans l'inducteur (13), mais de sens opposé à celui du premier courant, et en ce que la commande de la quantité d'énergie alimentant l'inducteur (13) considéré au cours d'une période est réalisée par des variations de même valeur de la durée des impulsions de commande (A, B).
  2. Procédé selon la revendication 1, caractérisé en ce que l'énergie alimentant l'inducteur (13) considéré est fournie sous la forme d'une paire d'impulsions (A, B) de même durée au cours d'une période.
  3. Procédé selon la revendication 1, caractérisé en ce que les variations de la durée des deux impulsions (A, B) formant la paire d'impulsions considérée sont de même valeur.
  4. Procédé selon la revendication 1, caractérisé en ce que la première impulsion de commande (A) commence à être produite en lien avec le début de la période (Tmax) pour toutes les puissances de l'inducteur (13).
  5. Procédé selon la revendication 1, caractérisé en ce que la durée (Tmax) de la période d'excitation de l'inducteur (13) correspond à la fréquence à laquelle l'inducteur (13) peut fonctionner à puissance maximale et en ce que cette durée (Tmax) reste inchangée pour tous les échelons de puissance de l'inducteur (13).
  6. Procédé selon la revendication 2, caractérisé en ce que la durée (TA ; TB) des impulsions (A ; B) considérées qui peuvent être commandées par l'inverseur (8) alimentant l'inducteur (13) en énergie est inférieure à la période (Tmax).
EP04405263A 2003-06-30 2004-04-29 Méthode et dispositif de régulation de puissance pour plaques à inductions Expired - Lifetime EP1494505B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH11512003 2003-06-30
CH01151/03A CH696649A5 (de) 2003-06-30 2003-06-30 Verfahren und Einrichtung zur Leistungsregulierung von Induktionskochherden.

Publications (3)

Publication Number Publication Date
EP1494505A2 EP1494505A2 (fr) 2005-01-05
EP1494505A3 EP1494505A3 (fr) 2006-05-03
EP1494505B1 true EP1494505B1 (fr) 2010-11-24

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Application Number Title Priority Date Filing Date
EP04405263A Expired - Lifetime EP1494505B1 (fr) 2003-06-30 2004-04-29 Méthode et dispositif de régulation de puissance pour plaques à inductions

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EP (1) EP1494505B1 (fr)
AT (1) ATE489830T1 (fr)
CH (1) CH696649A5 (fr)
DE (1) DE502004011915D1 (fr)
ES (1) ES2356737T3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2911472B1 (fr) 2013-12-20 2020-03-11 BSH Hausgeräte GmbH Dispositif d'appareil de cuisson, en particulier dispositif de plaque de cuisson, doté d'une pluralité d'onduleurs

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006058874A1 (de) * 2006-12-06 2008-06-19 E.G.O. Elektro-Gerätebau GmbH Verfahren zum Steuern von Induktionsheizeinrichtungen bei einem Elektokochgerät
DE102007050341A1 (de) * 2007-10-12 2009-04-23 E.G.O. Commercial Electronics Ag Induktionsmodul, Anordnung mehrerer Induktionsmodule und Verfahren zur Einrichtung eines solchen Induktionsmoduls
ES2622142T3 (es) 2008-10-08 2017-07-05 Whirlpool Corporation Un método para controlar una unidad de conversión de potencia estática y un sistema de calentamiento por inducción para aparatos de cocción usando dicho método
US9307581B2 (en) 2011-01-11 2016-04-05 Elatronic Ag Induction heating system with self regulating power control
DE102023108529A1 (de) 2023-04-03 2024-10-10 E.G.O. Elektro-Gerätebau GmbH Verfahren zum Betreiben eines Küchengeräts und Küchengerät

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH664660A5 (de) * 1983-05-07 1988-03-15 Barmag Barmer Maschf Induktive heizung fuer ferromagnetische materialien.
JP2530812B2 (ja) * 1985-12-12 1996-09-04 富士電機株式会社 高周波誘導加熱装置
US5004881A (en) * 1989-11-22 1991-04-02 Goldstar Co., Ltd. Method and circuit for controlling power level in the electromagnetic induction cooker

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2911472B1 (fr) 2013-12-20 2020-03-11 BSH Hausgeräte GmbH Dispositif d'appareil de cuisson, en particulier dispositif de plaque de cuisson, doté d'une pluralité d'onduleurs
EP2911472B2 (fr) † 2013-12-20 2022-11-09 BSH Hausgeräte GmbH Dispositif d'appareil de cuisson, en particulier dispositif de plaque de cuisson, doté d'une pluralité d'onduleurs

Also Published As

Publication number Publication date
EP1494505A2 (fr) 2005-01-05
EP1494505A3 (fr) 2006-05-03
ES2356737T3 (es) 2011-04-12
CH696649A5 (de) 2007-08-31
ATE489830T1 (de) 2010-12-15
DE502004011915D1 (de) 2011-01-05

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