EP1494505A2 - 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
EP1494505A2
EP1494505A2 EP04405263A EP04405263A EP1494505A2 EP 1494505 A2 EP1494505 A2 EP 1494505A2 EP 04405263 A EP04405263 A EP 04405263A EP 04405263 A EP04405263 A EP 04405263A EP 1494505 A2 EP1494505 A2 EP 1494505A2
Authority
EP
European Patent Office
Prior art keywords
inductor
energy
control
period
tmax
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
Application number
EP04405263A
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German (de)
English (en)
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EP1494505A3 (fr
EP1494505B1 (fr
Inventor
Heinrich Weder
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Elatronic AG
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Elatronic AG
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Filing date
Publication date
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Publication of EP1494505A2 publication Critical patent/EP1494505A2/fr
Publication of EP1494505A3 publication Critical patent/EP1494505A3/fr
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Publication of EP1494505B1 publication Critical patent/EP1494505B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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 hobs with at least one hob, each one of them Cooking points has an inductor, and a means for implementation this procedure.
  • a cooking device generally has at least two juxtaposed Induction hotplates, each of which includes an inductor.
  • the heating or heating of the Gefässes with the food is known by induction of eddy currents in a vessel.
  • One of the basic conditions for the induction of eddy currents in the vessel is an electromagnetic alternating field.
  • This is in the cooking area an induction cooker by means of a time-varying electrical Power generated by the cooking area inductor, which is one of the constituents represents an electrical resonant circuit.
  • This resonant circuit is stimulated by a clock source and he generates the for the induction of eddy currents in the vessel necessary alternating current.
  • the cooking or cooking operations require that different amounts be supplied by energy to the adjacent cooking vessels. Therefore, known induction cookers also have the option of Control the amount of energy supplied to the cooking vessels.
  • These Power control can basically be done in two ways. On the one hand, the power control or regulation by changes in the Frequency of the current flowing in the inductor resonant circuit electrical current achieved become. The range of these frequencies is usually between 22KHz and 45KHz, i. in an area which is above the audible range Frequencies lies. On the other hand, the power control or Regulation by changes in the duration or length or width of the by the Inducer flowing current pulses can be effected.
  • the object of the present invention is the mentioned disadvantage as well still eliminate other disadvantages of the known induction cookers.
  • Fig. 1 shows schematically and in plan view an induction hob 1, which suitable for carrying out the present process.
  • This stove has a stove plate 2, which in the case shown in Fig. 1 four induction cookers 3 are assigned.
  • the respective hob 3 includes an induction hotplate 5.
  • the induction hotplate 5 includes an inductor 13 ( Figure 2), which is located on a base plate 12, wherein the inductor 13 of the bottom the stove plate 2 is assigned in a manner known per se.
  • the inductor 13 is wound from a strand of copper, for example.
  • the base plate 12 is preferably made of a heat-resistant material, such as for example, ceramic.
  • the respective cooking point 3 further comprises a drive device or a power source 4 for the induction hotplate 5 ( Figure 2).
  • This driving device 4 includes an inverter 8 and a control device 9 for the Inverter 8.
  • the inductor 13 of each of the juxtaposed Hobs 3 is connected to its own 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 the respectively applied cooking. or cooking process can control.
  • the operation of the microprocessor 10 can only by means of a in Fig. 2 schematically indicated control device 23 are influenced.
  • These Device 23 includes, among other things, a component above which values for the desired cooking by the operator to be entered can.
  • Corresponding keypads are available on the market and they belong to the state of the art. As a rule, potentiometers or tiptasts used with an electronic control logic for such function.
  • microprocessor 10 with a technical interface 24 for the Connection of other devices (not shown) provided by which the microprocessor 10 can be programmed, for example.
  • the technical Interface 24 is designed as a bidirectional communication interface. This interface can conform to a valid standard such as RS-232, RS-485, Ethernet, USB or similar work.
  • RS-232, RS-485, Ethernet, USB or similar work can conform to a valid standard such as RS-232, RS-485, Ethernet, USB or similar work.
  • Control lines 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 of the output from the microprocessor 10 control signals connected.
  • the signal processing device 20 may be a standard module be executed in which a custom electronic circuit is programmed. Preference is given to a PGA or it may be an equivalent Block be used. This processing device 20 is via control lines 7A and 7B with the corresponding inputs A and B of the inverter 8 connected.
  • the inverter 8 provides a controlled power level of the present device This means that the inverter 8 the current flow through the inductor 13th due to the pulses supplied to it by the microprocessor 10 can control.
  • the induction coil 13 and the capacitor 15 and 16 are designed so that the parameters the same are not changeable. These parameters are chosen that the resonant frequency of this resonant circuit for all areas of power regulation well below the working frequency of 22kHz of the present submission is.
  • the resonant frequency of the resonant circuit can in Range between 16 and 20 kHz.
  • the inductor 13 thus provides a central Part of the inverter 8, by means of which energy to the cooking vessels 6 can be transmitted.
  • the inductor resonant circuit is similar to a bridge educated.
  • One of the branches of this bridge is the series-connected capacitors 15 and 16.
  • the free electrode of the first capacitor 15 is on the positive terminal of a source DC is connected to the supply voltage.
  • the free electrode of the other capacitors 16 is connected to the negative Terminal of the source DC of the supply voltage connected.
  • 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 in the illustrated case to the positive terminal of the voltage source DC connected.
  • At the base of this first transistor 25 is the first and 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 connected.
  • To the base of this second transistor 26 is the second and incoming from the signal processing device 20 Control line 7B 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 between the interconnected electrodes of the capacitors 15 and 16 lies. At this center tap point 18 is one of the ends or connecting conductor 14 of the inductor coil 13 connected. Between the emitter of the first power semiconductor 25 and the collector of the second Power semiconductor 26 is another point 19 available. At this Center tap point 19 is the second end and the second connection conductor 17, respectively the inductor coil 13 connected.
  • the power semiconductors 25 and 26 designed as bipolar transistors. In particular, however Also versions with related power semiconductors conceivable, such e.g. IGBTs (Insulated gate bipolar transistors), MOS-FET transistors, thyristors, GTO's and triacs.
  • inverter 8 In the inverter 8 are further sensors for temperature monitoring of Power electronics and the vessel 6 and devices for measuring the Current through the inductor 13 and the current performance of the inductor 5 integrated (not shown). Those supplied by these monitors Results are returned to the microprocessor 10 via the test leads 11.
  • These measuring leads 11 are signal lines connecting the inverter 8 connect to the microprocessor 10 and which are designed so that either digital or analog measurements from the inverter 8 in the microprocessor 10 can be transmitted.
  • These signal lines 11 can be dedicated Wires and a digital control bus include.
  • the supply of the respective inductor 13 with energy is pulse-like and periodically. This means that energy the inductor 13 in the form of pulses is fed and that these pulses within successive or repetitive periods or time windows.
  • This situation is in Fig. 3, 4 and 5 illustrated by diagrams.
  • On the X-axis of each Chart is plotted time t.
  • the individual periods or Time windows of the energy supply to the inductors 13 are superimposed in all three lying Fig. 3 to 5 by means of perpendicular to the X-axis and superimposed lines L separated from each other.
  • a period or a time window is therefore referred to below as LL.
  • the time slots LL have the same length or width for all inductors 13. In addition, the beginnings and ends of the time windows are practically in the same Time L.
  • the length or width of the repeating time slots LL is referred to as Tmax ( Figure 4).
  • the length of the time window Tmax is at all Cooking zones 3 equal, so that the repetition frequency of the feed of the adjacent Inductors 13 with energy at all inductors 13 practically the same is.
  • the Tmax is also constant for all inductors 13, i. invariable and moreover chosen so that the length of Tmax of the period the frequency of about 22kHz. This frequency corresponds to the working frequency of about 22kHz of the inductor resonant circuit in the inverter 8.
  • the Inductors 13 of all cooking zones 3 are in this frequency or frequency with supplied with the energy pulses.
  • the actual control of the power of the inductors 13, as already done was mentioned by a pulse-like conduction of current I through the inductors 13 of the cooking zones 3 within the time slots LL.
  • the at the respective Inductor 13 delivered electrical power is not only from the Size of the current flowing through the coil 13 current I determines but also by that time period during which this current I through the coil 13th flows.
  • the time period during which the current I through the inductor 13 flows is virtually identical to that period during which the relevant controllable switch 25 and 26 in the inverter 8 is conductive. therefore the time course of the current I through the inductor 13 in connection with the time course of those pulses or those voltages A and B will be described, which control the opening of the switching elements 25 and 26.
  • the pulse A in Fig. 3 to 5 shows the time course of that control voltage US during a time slot LL, which via the line 7A to the base of first, transistor 25 is applied.
  • the drive signals A and B are practically rectangular signals.
  • the size of the control voltages US lies between 0 volts and a maximum appropriate drive voltage US, which for the operation of the switches 25 and 26 is appropriate.
  • These control pulses A and B have the same polarity.
  • the generation of the first control pulse A begins always at the beginning or shortly after the beginning of the respective time window LL or the respective period Tmax, i. at time 0 of the time window LL or shortly thereafter, regardless of how long pulses A and B last.
  • the control pulse B is generated only after the pulse A, and only after the expiration of a short period of time, 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 Feeding of the inductor 13 with energy.
  • Fig. 5 shows the length TA and TB of Control pulses A and B for a minimum energization of the inductor 13 with energy.
  • Fig. 4 shows the length TA and TB of the control pulses A and B for a Average 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 flows in this case from the negative terminal DC- through this transistor 26, the center tap 19 located between the transistors 25 and 26, the coil 13, between the capacitors 15 and 16 lying center tap 18 and the capacitors 15 and 16 to the positive terminal DC + the DC voltage source DC.
  • a pulse B arrives via the line 7B to the base of the other transistor 25 and makes this conductive.
  • the current I now flows from the positive terminal DC + through this transistor 25, the transistor means tap 19, the coil 13, but now in the opposite Direction, the capacitor center tap 18 and the capacitors 15 and 16 to the negative terminal DC DC power source DC.
  • TA or TB could be practically counteracted for power regulation Go zero. However, for technical reasons, this choice does not make much sense.
  • a sum S of TA and TB is preferred, which is the period length Tmin corresponds to a frequency which is about 44 kHz.
  • the present method offers besides the advantage that the performance in each Cooking area 3 can be individually regulated, even the important advantage that the supply network for the electrical energy is not pulsed but continuous is charged. This is because the TA and TB are simultaneous and always be extended or shortened by the same amount. This is important because because the hobs 3 at their peak power several amps of electricity usually taken from the supply network.
  • the present method can also be carried out in a controlled manner, by supplying measurement signals via the measuring lines 11 to the microprocessor 10 become.
  • the microprocessor 10 controls in this case based on Measured values from the measuring lines 11, the size of the inductor current I, his Zero crossing, the timing of the switching of the control lines 7A and 7B, etc.
  • the entire cooking process can be monitored in this way and be regulated. So requires a large saucepan 6 filled with water another type of operation of the cooking area 3 as, for example, a frying pan with a fried egg. In particular, no cooking process may be started, if other metallic objects such as e.g. a fork or a Cooking spoons are on the stove.
  • An extension of the present method is that via measuring pulses the nature of the vessel 6 is continuously detected on the stove top 2.
  • the control pulses A and B for the switches 25 and 26 pulses upstream (not shown), whose length is smaller than the length of the control pulses A and B.
  • These measurement pulses arrive in the way described for the control pulses A and B to the inductor thirteenth the stove plate 2, on which the cooking vessel 6 rests. According to the texture This cooking vessel 6, the measuring pulses are influenced and such an answer 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 concerning this situation are superimposed played.
  • the control voltage US for the switches 25 and 26 discharged.
  • the size of this Phase shift depends on the type or quality of the vessel or on the stove top 2 located subject dependent.
  • the size of the phase shift is determined by the time difference DT between the zero crossing of Control voltage US and the zero crossing of the current IS through the inductor 13 determined. The smaller this time difference DT, the better the quality of the vessel 6, so that a cooking process by the inverter 8 are started can.
  • time difference DT is adjustable in the control device 9 Exceeds minimum limit for the quality, then is a cooking process no longer effectively possible. This, for example, because the Vessel 6 is made of a material which is not suitable for induction heating is suitable. In such a case, the control device 9 takes the inverter 8 and thus also plate 5 is not in operation or it switches the inverter 8 and thus also this hob 3 off.
  • Step responses stored in the memory of the microprocessor 10.
  • a series of temporally changeable time intervals TA respectively.
  • TB stored in the memory of the microprocessor. So can operations such as. a large heating power for searing followed by Stewing individually adapted to the food by the microprocessor and be managed
  • the information about the food, the cooking progress, etc. are about the Test leads 11 supplied to the microprocessor 10. It also external Sensors used such. an external temperature sensor 27, which in the food can be inserted and which so the status of the cooking process via a corresponding measuring line 11 to the microprocessor 10 reports.
  • the relevant parameters of the method for the different forms of the vessels and the food be changed or extended at any time.
  • the method of a foreign system such as a parent control device, from an external diagnostic device or from a workstation to diagnose, control, etc.
  • Fig. 6 shows an embodiment of a feeding device 30 for the inductor 13, when feeding it with energy from a three-phase Supply network is to be made.
  • the feeding device 30 includes, among others three phase connections L1, L2 and L3 to the supply network.
  • a rectifier 28 is connected, which is designed as a three-phase bridge rectifier. This is changing the AC voltage from the supply network in a DC voltage, which at the output terminals DC + and DC- of this feeding device 30 can appear.
  • a smoothing capacitor C Between the output terminals DC + and DC- of the three-phase bridge rectifier 28 is a smoothing capacitor C.
  • To the Output terminals DC + and DC- of the bridge rectifier 28 becomes the DC voltage tapped for the inductor 13 and by the LC resonant circuit or supplied to the inductor 13 through the bridge in the inverter 8.
  • the feeding device 30 may also be used to limit the present invention Set up the network power to be set up. These Power limitation is necessary to increase the consumption of the stove to energy as part of the energy extraction permitted during building installation to be able to hold.
  • a current measuring device is connected to one of the phase conductors L1 29, which precedes the bridge rectifier 28 is.
  • the output of the current measuring device 29 is at one of the inputs the control device 9 connected.
  • maximum allowable currents in the control device 9 are corresponding maximum allowable currents in the control device 9 as control parameters adjustable.
  • the control device 9 regulates the maximum power consumption of the inductor 13 in such a way that the maximum power received by the building installation is still permissible Value does not exceed.
  • the present device can also be powered from a single-phase network be supplied.
  • the feeder 31 has via a single-phase bridge rectifier 32, which via terminals N and L can be connected to the single-phase supply network.
  • the current measuring device 29 is in this case in the connection conductor L.
  • the method according to the invention offers, inter alia, the possibility that the size of the power of the individual hobs 3 in an induction cooker 1 can be controlled simultaneously and individually, without being audible and usually due to interference between adjacent inductors 13 caused noises, such as whistling, arise. consequently may be arranged side by side cooking zones 3 in an induction cooker 1 operated with different services, without the mentioned Noises arise.
  • the present method offers under other benefits that the power grid for electrical energy without Power surges is charged 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 multi-phase AC voltage.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Induction Heating (AREA)
  • Cookers (AREA)
  • Induction Heating Cooking Devices (AREA)
  • Inverter Devices (AREA)
  • Electric Stoves And Ranges (AREA)
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
CH01151/03A CH696649A5 (de) 2003-06-30 2003-06-30 Verfahren und Einrichtung zur Leistungsregulierung von Induktionskochherden.
CH11512003 2003-06-30

Publications (3)

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

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ID=33426275

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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

Country Status (5)

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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 (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008067999A1 (fr) * 2006-12-06 2008-06-12 E.G.O. Elektro-Gerätebau GmbH Procédé de commande de dispositifs de chauffage par induction dans un appareil de cuisson électrique
EP2175690A1 (fr) * 2008-10-08 2010-04-14 Whirpool Corporation Procédé de contrôle d'une unité de conversion de puissance statique et système de chauffage par induction pour appareils de cuisson utilisant ledit procédé
WO2012095732A1 (fr) 2011-01-11 2012-07-19 Elatronic Ag Système de chauffage par induction ayant une commande de puissance autorégulatrice

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
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

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5004881A (en) 1989-11-22 1991-04-02 Goldstar Co., Ltd. Method and circuit for controlling power level in the electromagnetic induction cooker

Family Cites Families (2)

* 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

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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 (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008067999A1 (fr) * 2006-12-06 2008-06-12 E.G.O. Elektro-Gerätebau GmbH Procédé de commande de dispositifs de chauffage par induction dans un appareil de cuisson électrique
EP2175690A1 (fr) * 2008-10-08 2010-04-14 Whirpool Corporation Procédé de contrôle d'une unité de conversion de puissance statique et système de chauffage par induction pour appareils de cuisson utilisant ledit procédé
US8492685B2 (en) 2008-10-08 2013-07-23 Whirlpool Corporation Method for controlling a static power conversion unit and induction heating system for cooling appliances using such method
WO2012095732A1 (fr) 2011-01-11 2012-07-19 Elatronic Ag Système de chauffage par induction ayant une commande de puissance autorégulatrice
US9307581B2 (en) 2011-01-11 2016-04-05 Elatronic Ag Induction heating system with self regulating power control

Also Published As

Publication number Publication date
DE502004011915D1 (de) 2011-01-05
EP1494505A3 (fr) 2006-05-03
EP1494505B1 (fr) 2010-11-24
ATE489830T1 (de) 2010-12-15
ES2356737T3 (es) 2011-04-12
CH696649A5 (de) 2007-08-31

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