EP0561207A2 - Commande d'une plaque de cuisson à induction - Google Patents

Commande d'une plaque de cuisson à induction Download PDF

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Publication number
EP0561207A2
EP0561207A2 EP93103273A EP93103273A EP0561207A2 EP 0561207 A2 EP0561207 A2 EP 0561207A2 EP 93103273 A EP93103273 A EP 93103273A EP 93103273 A EP93103273 A EP 93103273A EP 0561207 A2 EP0561207 A2 EP 0561207A2
Authority
EP
European Patent Office
Prior art keywords
resonant circuit
circuit
power
measurement
control
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.)
Withdrawn
Application number
EP93103273A
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German (de)
English (en)
Other versions
EP0561207A3 (en
Inventor
Heinrich Vogelmann
Franz Bogdanski
Jürgen HORN
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
EGO Elektro Geratebau GmbH
Original Assignee
EGO Elektro Gerate Blanc und Fischer GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by EGO Elektro Gerate Blanc und Fischer GmbH filed Critical EGO Elektro Gerate Blanc und Fischer GmbH
Publication of EP0561207A2 publication Critical patent/EP0561207A2/fr
Publication of EP0561207A3 publication Critical patent/EP0561207A3/de
Withdrawn legal-status Critical Current

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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
    • H05B6/06—Control, e.g. of temperature, of power
    • H05B6/062—Control, e.g. of temperature, of power for cooking plates or the like

Definitions

  • the invention relates to an inductive hotplate heater for cooking vessels or the like.
  • Induction heating has the advantage of very low-inertia heat generation directly in the cooking vessel, namely in the bottom of the saucepan.
  • the cooking appliance itself remains largely cold.
  • Their disadvantage is the relatively high construction costs and the difficult controllability. Since electronic components are required for the necessary high-frequency generation and its control and, on the other hand, due to the heat loss in the electronics and the induction coil, the induction generating means nevertheless heat up more, it was necessary to arrange the conversion and control electronics separately from the hotplate. This hampered installation in normal cookers or hobs and induction hobs were therefore mostly installed in special appliances.
  • the object of the invention is to control an inductive hotplate heating so that the placement or removal of a suitable cooking vessel on or from the hotplate is recognized with the necessary security and speed. In particular, this should be done without complex additional scans etc. in a circuit that can be easily integrated into the high-frequency generation.
  • the resonant circuit in which the induction generating means themselves are located, is also used for pot detection, in that a measurement of the damping, ie. H. the power take-off of the resonant circuit, and depending on the result it is decided whether the full power is switched on.
  • test performance is extremely low and energetic and insignificant for the environmental impact.
  • the measuring current can be tapped directly in the resonant circuit and, if necessary, processed via a measuring transducer in the control circuit. It is also possible to work in a comparable manner instead with the voltage in the resonant circuit, for example on one of the resonant circuit capacitors.
  • the pot detection circuit could also be used to perform an evaluation of the pot placed on it and to define different power levels depending on it. For example, the release of the absolute maximum power could be reserved for a certain damping variable.
  • these heaters require pots with a ferromagnetic base in order to be fully effective.
  • the invention enables such a precise check of the power consumption to be carried out that placing other objects on the induction hob, for example aluminum pots or the like, does not lead to activation.
  • the magnitude of the current in the resonant circuit is continuously monitored and immediately leads to a shutdown if a specified maximum value is exceeded.
  • the power still present in the resonant circuit can be fed back into an intermediate circuit supplying the resonant circuit via free-wheeling diodes.
  • Such an intermediate circuit can be provided for supplying several, preferably two resonant circuits or converters, each of which operates an induction hob.
  • the monitoring of the maximum current in the resonant circuit for quick shutdown and the measurement of the test current for the "switching on pot detection" can be carried out by the same circuit components, so that the circuit is simple.
  • FIG. 1 to 3 show a component 11 for two induction hotplates 10. It is provided for arrangement under a plate 12, for example a glass ceramic plate.
  • the component forms a compact, relatively flat, manageable structural unit which, with the exception of the mains connection and an adjusting and regulating member 27 with adjusting knob 26, which can also include a power control device which contains all the elements necessary for operation.
  • the component can be pressed against the plate 12 from below, for example, by spring elements, not shown. Due to this arrangement and the inclusion of all essential components, the induction heating can also be arranged in a glass ceramic cooktop instead of and in addition to the usual radiation cooktops.
  • the component contains a heat sink 15 in a sheet metal shell 23, preferably an aluminum molded part with a largely closed surface at the top, and cooling fins 18 on the underside, which form cooling channels 19 between them. They run approximately along an axis 9 connecting the two hotplates 10.
  • the heat sink has recesses 29 on the top, in which induction generating means 14 are arranged, each of which is assigned to a hotplate 10.
  • a circuit board 16 is provided on the underside of the heat sink, for example screwed to the outer cooling fins, so that the cooling channels 19 and further larger spaces 28, which also serve as cooling channels, enclose on the underside of the heat sink 15.
  • Electronic power control elements 21 are arranged therein, preferably in heat-conducting connection with the heat sink 15.
  • the circuit board also carries electronic components, but predominantly the elements used for control, which operate with relatively small currents and therefore less heating. The whole thing is inserted in a sheet metal bowl.
  • the board could also form the bottom cover itself.
  • ventilation openings 25 are provided, through which a fan 37 arranged in a recess in the cooling body 15 sucks in air or blows it out after flowing through the cooling channels 19, 28.
  • a fan arranged centrally on the heat sink and having an air outlet on two or more sides is also possible.
  • the induction generating means 14 consist of an induction coil 30 in the form of a flat, disk-shaped or ring-shaped plate, magnetic return means 31 arranged underneath and thermal insulation 32 on the side facing the plate, in the area of which a shield 33 can be provided.
  • the induction coil 30 contains, as a helix and / or a spiral, stranded strands 38 which are constructed from individual conductors 39 (see FIG. 12).
  • the strand 38 is made up of a plurality of, preferably five to nine, in the present case seven card cores 40 which are stranded together and in turn contain a number between five and nine, in the present case seven individual wires stranded together.
  • the individual conductors are electrically insulated from one another in the usual way, for example by means of a heat-resistant lacquer layer.
  • the individual conductors 39 made of copper have a diameter d between 0.1 and 0.4 mm, preferably 0.2 mm. This value applies to the preferred frequency of the current fed to the induction coil between 20 and 30 kHz, preferably approximately 25 kHz.
  • the electrical conductivity k of the individual conductor material is in A / V * m, the permeability ⁇ is to be used in V * s / A * m and the frequency f in 1 / s.
  • the preferred wire thickness d is preferably between a quarter and three quarters of the base value D calculated according to this formula. It has surprisingly been found that with these small diameters of the individual conductors, the power loss in the induction coil 30 could be significantly reduced.
  • the coil losses should decrease by up to the diameter d decrease a value equal to the base value D according to the above formula, but hardly afterwards.
  • the theoretical knowledge which was previously considered to be reliable, was based on the skin effect of a single conductor and determined an optimal size for the above-mentioned diameter D because the entire diameter was then flowed through evenly despite the current being displaced to the surface.
  • the base value D corresponds to the depth of penetration of the current into a conductor surface, with the round wire shape resulting in penetration from all sides at the same time and thus a uniform current occupancy over the cross section.
  • the reasoning behind this theory has, however, surprisingly been refuted by experiments. Even a diameter of less than 0.2 mm, ie less than half of the base value D, would be preferred, but the mechanical possibilities of processing a diameter reduction put an end at some point.
  • the magnetic yoke means 31 Under the coil, also as a flat, annular layer with a central opening 35, is the magnetic yoke means 31, which is made up of ferrite segments. It closes the magnetic field that arises on the underside of the induction coil with a low magnetic resistance but a high electrical resistance, so that the eddy current losses remain low there as well. Therefore, no essential induction field arises on the underside of the induction generating means 14.
  • the magnetic yoke means 31 also form a thermal bridge between the induction coil 30 and the heat sink, on which they rest, so that the coil loss heat is dissipated directly into the heat sink.
  • the thermal insulation 32 is in the form of a plate covering the induction coil 30 with a central opening 35 between it and the glass ceramic plate 12. It consists of a very good heat-insulating and, if possible, also electrically insulating material, for example a pyrogenic silica airgel, which presses into a plate is.
  • the induction coil generates so little heat, in particular in the case of the low-loss coil structure mentioned above, that heat bridge to the consumer tends to extract heat rather than supply it to the consumer.
  • Thermal insulation keeps the induction coil at a lower temperature level, which has advantages for coil design and isolation.
  • the thermal insulation 32 advantageously also forms an electrical insulation against the glass ceramic plate 12, which becomes electrically conductive at an elevated temperature.
  • an optical sensor 36 is arranged which receives the radiation coming from the glass ceramic plate. It thus indirectly monitors the temperature of the cooking vessel that could become dangerous to the glass ceramic plate by means of non-contact measurement, which would otherwise be difficult to carry out in the magnetic field of an induction hob. It is therefore a measurement of the cause of the temperature hazard of the glass ceramic plate, since this is only heated by the cooking vessel.
  • the glass ceramic allows the radiation to pass through to a large extent and can therefore hardly be measured without contact. With other plate materials, they can themselves be the radiation source.
  • the optical sensor is an infrared detector, whose spectral sensitivity is in the infrared range. As the temperature of the cooking vessel rises, the maximum of the frequency of the emitted photons increases according to Wien's law of displacement. From a predetermined temperature, the energy of the emitted photons corresponds to the spectral sensitivity of the IR detector, so that an evaluable signal is produced which is then used to switch off or reduce the power of the induction heating.
  • the optical sensors 36 of each induction hob act on a microcomputer 42 via comparators 41 (FIG. 4), one of which is provided for the control and regulation of an induction hob. It can be adjusted to a specific temperature or power level in each case by means of the setting element with the setting button 26.
  • the optical sensors 36 can be silicon diodes.
  • measuring resistors could also be applied to the plate, e.g. B. between insulation and plate in the coil area if the measuring resistances are not or only slightly influenced by the magnetic field and an influence is compensated for by circuitry or in the measuring program.
  • the shield 33 is provided between the induction coil 30 and the glass ceramic plate 12. It can lie on the bottom or top of the thermal insulation 32 or advantageously be embedded in it.
  • the shielding consists of a wire or ribbon structure, for example shown in FIGS. 4 and 6, which is of low eddy current design. On the one hand, this means that the thickness of the individual structural elements 45 (wires, strips or the like) is less than the current penetration depth at the frequency used and on the other hand the structures are in no way electrically closed. 6 there is therefore an open ring conductor 46 with inwardly projecting branches 45 which are of different lengths, so that the entire area is evenly occupied.
  • the ring 46 is connected to an earth 34, for example by connection to the earthed sheet metal shell 23 of the component 11 (FIG. 1).
  • FIG. 7 shows a structure in which branches with conductor structures 45 extend outwards from a center point at which the grounding acts, which are also branched in such a way that they shield the hob as evenly as possible.
  • the shield could also be formed by a grounded layer of a resistance material. It is essential that the material is non-magnetic and, in order to avoid eddy current losses, has a relatively high electrical resistance compared to metallic conductors.
  • FIG. 4 shows that the alternating current coming from the mains connection 22 via a radio interference suppression 50 and rectification 51 a common intermediate circuit 52 is supplied, from which both converters 53, which could also be referred to as high-frequency generators, are supplied for each induction coil 30.
  • the intermediate circuit and converter are controlled by a controller 54, which in turn receives signals from the microcomputers (MG) 42.
  • FIG. 5 shows the circuit of an induction coil 30 in greater detail, the control, converter 53 and induction coil 30 of a second hotplate, which is also connected to the intermediate circuit 52, not shown for the sake of clarity.
  • the intermediate circuit 52 not shown for the sake of clarity.
  • Each induction coil 30 is in an oscillating circuit with a half-bridge circuit, ie two branches 55, 56 are provided, in each of which a capacitor 57, 58 and an electronic switch 60, 61 are located.
  • These can be IGBT components, that is to say electronic semiconductor components which contain a plurality of transistor functions and which, controlled by the controller 62, can switch extremely quickly.
  • a free-wheeling diode 63, 64 and a resistor 65, 66 are connected in parallel with each of these circuit breakers 60, 61.
  • These elements form the converter 53 designed as an oscillating circuit, to which the intermediate circuit 52 and the rectifier 51 are connected upstream.
  • a rectifier bridge generates a pulsating DC voltage, in which sine half-waves of the same polarity are strung together by rectifying the mains alternating current.
  • the outputs of the rectifier bridge 51 are connected to the two branches 55, 56.
  • In the intermediate circuit there is a common capacitor 67 between the two branches and a resistor 68 switched by an electronic switch 69.
  • the switch 69 can be a MOS-FET which, in cooperation with the resistor, prevents the When the inverter is switched on, crackling noises occur. It discharges the DC link.
  • a control unit 80 which contains a galvanic isolation between the low voltage part 54 and the power side, for example by optocouplers. Furthermore, the switches are supplied with the control energy. This is supplied via supply units 81 which are located in the branches of the resistors 65, 66 and which each contain a Zener diode 82 and a diode 83 and a capacitor 84.
  • the Zener dione limits the voltage to the control voltage required for the switches 60, 61 and the diode and capacitor act as rectification. This creates a simple "power supply" for the switch drive energy, which draws its energy from the resistance branch, i. H. from an energy source that is already available. The resistors will thereby generate less energy and yet the other conditions will not be affected, e.g. B. the current value at point 70.
  • the resonant circuit shown in the symmetrical circuit structure could also be replaced by an asymmetrical structure in which only one is provided instead of the two resonant circuit capacitors 57, 58.
  • the resonant circuit then only absorbs energy from the network on one side. In particular, in cases where it is not important to adhere to certain radio interference suppression values, this simpler circuit design could be advantageous.
  • a switching control 71 for the converter 53 is connected to a tapping point 70 between the induction coil 30 and the capacitors 57, 58 of the resonant circuit Sample-hold 72, a limit memory 73, a comparator 74 and a yes / no memory 75 contains.
  • This switching control is intended to switch off the induction heating immediately when there is no decrease in power, for example when the cooking vessel 13 is removed from the hotplate, and to switch it on again only when a cooking vessel is present. For this purpose, a check is carried out at relatively short intervals as to whether a customer is present. This is done by measuring the damping of the induction coil 30.
  • the resonant circuit is always switched on at the zero crossing of the mains voltage, in accordance with a certain scheme that is specified by the microcomputer 42 and will be explained in the following.
  • the resonant circuit is controlled by the electronic circuit breakers 60, 61, specifically from the controller 62. Before each half-wave of the generated high-frequency voltage, which is of the order of 25 kHz, there is a switchover between the circuit breakers 60, 61 at the zero crossing. This creates a completely free-running converter or inverter 53 which has low switching losses.
  • no phase gating control which would result in a forced oscillation, is used for power setting or control.
  • the frequency is not constant and can be adjusted by frequency modulation according to the saturation effects. As a result, no oversizing of the electrical circuit breakers 60, 61 is necessary and there is also a small harmonic generation.
  • the power setting is done by a vibration package control.
  • the converter is always switched on for a full line half-wave in normal operation.
  • the basis of the power setting is that different power levels are determined by switch-on patterns, which consist of a sequence or combination of the same or different, in themselves symmetrical basic patterns of wave packets. The complete symmetry minimizes network interference.
  • FIGS. 8 and 9 show an example of a sample occupancy plan for such a vibration package control:
  • a total time interval Z of 2.1 seconds is divided into 35 subintervals T of 60 milliseconds each, ie six network half-waves at a frequency of 50 Hz.
  • Fig. 8 a) shows a subinterval T with the designation "*", in which all six network half-waves are present. So it's a "full power" interval.
  • Fig. 8 c contains only two network half-waves, the first as positive and the fourth as negative.
  • This subinterval T with the designation "Y" therefore has a power share of one third.
  • Fig. 8 d shows the zero power, d. H. no power is released during this partial power interval "0".
  • FIG. 9 now shows the occupancy plans using the total of 35 subintervals T, which together form the time interval Z of 2.1 seconds duration. Only various power levels are shown there, for example, corresponding to the toggle position of the adjusting knob 44, to which the most varied combinations of the basic patterns according to FIG. 8, each in a row, are assigned. It can be seen from the percentages of power release given below that the power characteristic curve in a power-controlled induction hob can be adapted to practical requirements in this way. For example, the output in the lower setting levels can be regulated much more precisely than in the upper ones, which corresponds to practical requirements. Since each basic pattern "Y" according to FIG. 8 c) corresponds to less than one percent of power within the time period Z, the power can therefore be adjusted as a percentage. Completely irregular or discontinuous courses can also be achieved if this turns out to be expedient. Nevertheless, a switching in the zero crossing of the voltage is ensured.
  • FIG. 8 shows positive and negative network half-waves as they exist before rectification in order to demonstrate the absence of interference on the power network.
  • Mains half-waves are present in the resonant circuit in the form of rectified alternating current.
  • the basic patterns are mixed as desired under the control of the microcomputer and thus produce a control or control that is DC-free on the network side Control in relatively short pulses, but each containing an entire network half-wave.
  • the setting can be purely performance-dependent via the setting elements 43, as shown in FIG. 9, but control influences from temperature sensors or the like can also act on the microcomputer, so that a control circuit is created.
  • the start of the resonant circuit for generating the high frequency feeding the induction coil 30 thus basically begins at the zero crossing of the mains voltage and the amplitude and frequency in the resonant circuit change with the rise and fall of current and voltage over the individual mains half-waves.
  • the frequency is therefore higher at the beginning of each half-wave and decreases in the area of its maximum because the converter oscillates freely.
  • the frequency changes not only with the current, but also with the pot material because, for example, the inductance is not constant due to magnetic saturation in the bottom of the pot. If the inductance of the overall arrangement becomes smaller, a higher frequency results.
  • This arrangement also has advantages in terms of radio interference suppression because broadband interferers are easier to suppress. In addition, fewer harmonics are generated because phase control is not necessary.
  • a phase-controlled loop circuit (PLL "phase locked loop") specifies the control clock frequency for the circuit breakers 60, 61.
  • PLL phase locked loop
  • the loop circuit gives an impulse from the Micro-computer releases a half-wave by closing one of the two circuit breakers 60 or 61.
  • the tapping point 70 was charged to a certain voltage via the resistors 65, 66 and thus a certain energy was present in the resonant circuit.
  • the sample and hold member e.g. B. a peak detector, which also contains a current transformer to convert the actually flowing currents into measuring currents, measures the current during this oscillation and stores the result. It corresponds to the value i max in FIG. 10.
  • the amplitude now decays according to the energy consumption due to the damping according to a specific function (corresponding to an e-function). If this decay is too slow, the damping is too low and the conditions for power on are not met.
  • the pan detection therefore works on the principle of damping measurement, with the test only working with one half of the converter, so that the power resonant circuit does not start, for which purpose an alternate activation of the two power switches 60, 61 would be necessary.
  • the test procedure takes place in such a way that, for example, the first oscillation when one of the power transistors 60 or 61 is switched on for a very short period of time 20 microseconds (about a half oscillation in idle frequency) the current value measured, held by the sample and hold 72 and from it in the limit memory 73, the subsequent limit values, z. B. G1 to G5 can be derived.
  • the loop circuit PLL Under the control of the microcomputer, the loop circuit PLL then pauses P in the same order of magnitude and then switches on the power transistor again. From the current drop in the next oscillation (see FIG. 11 a), it can now be determined by comparison with the limit values, which is done via the comparator 74, whether the current exceeded these limit values (here G2 and G3). The result of this check is temporarily stored in the memory 75.
  • a second activation then takes place, where the limit values G4 and G5 are used for comparison.
  • this second measurement is carried out in order to prevent falsification by strong frequency deviation, e.g. B. to avoid errors in an aluminum or copper object instead of a cooking vessel. If this measurement also does not result in the limit values being exceeded, the damping is sufficient and the oscillating circuit is switched on by the control 62. Since the entire measurement took place in the microsecond range, the energy in the oscillating circuit decayed because it was above the circuit breakers 60, 61 high-resistance voltage dividers 65, 66 connected in parallel could not be replaced during this time.
  • the resonant circuit is again supplied with the corresponding test voltage via this voltage divider and a new test can begin if the limit values are exceeded and thus "too little damping" was detected and the resonant circuit was not switched in power mode.
  • the test can take place with a very low test current, for example with a tenth of the nominal current during power operation.
  • the oscillation circuit in test mode is only about 1 / 100,000th of the total time in operation due to the very short switch-on times of, for example, 20 microseconds within the test cycle of 2 seconds, the total power release during the test is only a completely insignificant fraction of the total power of the hotplate and can be neglected both energetically and in terms of influencing the environment. For example, with a 2,000 W hotplate, it is on the order of 1 to 4 mW.
  • a very reliable, short-term access and low test energy measurement takes place.
  • a voltage measurement on the resonant circuit capacitor can also be used, for example, in order to carry out the test by measuring the decay of the voltage amplitude with the limit values determined on the basis of the initial measurement.
  • the test only works with one half of the converter, so the resonant circuit does not start up during the test phase. If during the two successive measurements (second and third activation of the PLL) the values stored in the memory 75 both show "damping sufficient" (limit values not exceeded), the oscillation circuit is switched on in the controller 72 by the PLL switching circuit 60 by alternately switching on the circuit breaker 60, 61 started at full power. The power release itself then takes place in accordance with the power scheme explained with reference to FIGS. 8 and 9 until either the hotplate is switched off via the setting element 43 the self-protection is accessed or the power is switched off so that it goes back to the test phase by removing the pot.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Cookers (AREA)
EP19930103273 1992-03-14 1993-03-02 Operating method of an induction cooking hob Withdrawn EP0561207A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19924208249 DE4208249A1 (de) 1992-03-14 1992-03-14 Induktive kochstellenbeheizung und verfahren zu ihrem betrieb
DE4208249 1992-03-14

Publications (2)

Publication Number Publication Date
EP0561207A2 true EP0561207A2 (fr) 1993-09-22
EP0561207A3 EP0561207A3 (en) 1993-10-13

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP19930103273 Withdrawn EP0561207A3 (en) 1992-03-14 1993-03-02 Operating method of an induction cooking hob

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DE (1) DE4208249A1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999031440A1 (fr) * 1997-12-16 1999-06-24 Uwe Schulte Amenagement de plaques de cuisson
WO2007042316A1 (fr) * 2005-10-14 2007-04-19 E.G.O. Elektro-Gerätebau GmbH Procede pour identifier un recipient et systeme de chauffage par induction
EP1793652A2 (fr) * 2005-12-02 2007-06-06 LG Electronics, Inc. Dispositif chauffant et appareil de cuisson électrique qui en est équipé
EP3187942A4 (fr) * 2014-10-23 2017-09-13 S-Printing Solution Co., Ltd. Dispositif et procédé de formation d'image
EP3066888B1 (fr) 2013-11-05 2019-08-07 BSH Hausgeräte GmbH Dispositif table de cuisson à induction
DE102019220199A1 (de) * 2019-12-19 2021-06-24 Robert Bosch Gesellschaft mit beschränkter Haftung Vorrichtung zum Versorgen eines mobilen Multischmelzgerätes mit Heizleistung und/oder zur Temperaturmessung
EP3890436A1 (fr) * 2020-04-02 2021-10-06 LG Electronics, Inc. Procédé pour décharger un condensateur d'appareil de conversion de puissance résonante pour lancer le fonctionnement et son appareil de conversion de puissance résonante

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2097691B1 (es) * 1993-11-23 1998-06-16 Balay Sa Mejoras en la fabricacion e instalacion de encimeras de induccion.
KR0160406B1 (ko) * 1993-12-15 1998-12-15 김광호 유도가열기능부 전자레인지 및 그 제어방법
DE19500449A1 (de) * 1995-01-10 1996-07-11 Ego Elektro Blanc & Fischer Kochstellenbeheizung für Kochgefäße
US6953919B2 (en) 2003-01-30 2005-10-11 Thermal Solutions, Inc. RFID-controlled smart range and method of cooking and heating
DE102007036334A1 (de) * 2007-08-02 2009-02-05 Electrolux Home Products Corporation N.V. Basiseinheit zum induktiven Aufheizen und Induktionsflüssigkeitserhitzungssystem
ES2643136T3 (es) 2011-03-29 2017-11-21 BSH Hausgeräte GmbH Dispositivo de conmutación

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FR2357141A1 (fr) * 1976-07-02 1978-01-27 Electricite De France Dispositif de chauffage par induction
US4352000A (en) * 1979-08-10 1982-09-28 Sanyo Electric Co., Ltd. Induction heating cooking apparatus
US4438311A (en) * 1979-07-05 1984-03-20 Sanyo Electric Co., Ltd. Induction heating cooking apparatus
DE3612707A1 (de) * 1985-04-17 1986-10-23 Sanyo Electric Co., Ltd., Moriguchi, Osaka Induktionsheizvorrichtung mit falschlastdetektor

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SU1094162A2 (ru) * 1983-02-25 1984-05-23 Предприятие П/Я А-1067 Устройство дл регулировани мощности индукционной плиты
US4885447A (en) * 1985-01-23 1989-12-05 Balay, S.A. System for the induction heating of the electric plates of a cooker
JPH07111905B2 (ja) * 1987-07-23 1995-11-29 株式会社東芝 誘導加熱調理器の負荷適否検知回路
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Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2357141A1 (fr) * 1976-07-02 1978-01-27 Electricite De France Dispositif de chauffage par induction
US4438311A (en) * 1979-07-05 1984-03-20 Sanyo Electric Co., Ltd. Induction heating cooking apparatus
US4352000A (en) * 1979-08-10 1982-09-28 Sanyo Electric Co., Ltd. Induction heating cooking apparatus
DE3612707A1 (de) * 1985-04-17 1986-10-23 Sanyo Electric Co., Ltd., Moriguchi, Osaka Induktionsheizvorrichtung mit falschlastdetektor

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999031440A1 (fr) * 1997-12-16 1999-06-24 Uwe Schulte Amenagement de plaques de cuisson
WO2007042316A1 (fr) * 2005-10-14 2007-04-19 E.G.O. Elektro-Gerätebau GmbH Procede pour identifier un recipient et systeme de chauffage par induction
EP1793652A2 (fr) * 2005-12-02 2007-06-06 LG Electronics, Inc. Dispositif chauffant et appareil de cuisson électrique qui en est équipé
EP1793652A3 (fr) * 2005-12-02 2007-12-05 LG Electronics, Inc. Dispositif chauffant et appareil de cuisson électrique qui en est équipé
EP3066888B1 (fr) 2013-11-05 2019-08-07 BSH Hausgeräte GmbH Dispositif table de cuisson à induction
EP3187942A4 (fr) * 2014-10-23 2017-09-13 S-Printing Solution Co., Ltd. Dispositif et procédé de formation d'image
US10234802B2 (en) 2014-10-23 2019-03-19 Hp Printing Korea Co., Ltd. Image forming device and method
US10705461B2 (en) 2014-10-23 2020-07-07 Hewlett-Packard Development Company, L.P. Image forming device and method
DE102019220199A1 (de) * 2019-12-19 2021-06-24 Robert Bosch Gesellschaft mit beschränkter Haftung Vorrichtung zum Versorgen eines mobilen Multischmelzgerätes mit Heizleistung und/oder zur Temperaturmessung
EP3890436A1 (fr) * 2020-04-02 2021-10-06 LG Electronics, Inc. Procédé pour décharger un condensateur d'appareil de conversion de puissance résonante pour lancer le fonctionnement et son appareil de conversion de puissance résonante
US11233446B2 (en) 2020-04-02 2022-01-25 Lg Electronics Inc. Method for discharging capacitor of resonant power conversion apparatus at initiating operation and resonant power conversion apparatus thereof

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Publication number Publication date
EP0561207A3 (en) 1993-10-13
DE4208249A1 (de) 1993-09-16

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