EP2506665A2 - Dispositif d'appareil de cuisson - Google Patents

Dispositif d'appareil de cuisson Download PDF

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Publication number
EP2506665A2
EP2506665A2 EP12158100A EP12158100A EP2506665A2 EP 2506665 A2 EP2506665 A2 EP 2506665A2 EP 12158100 A EP12158100 A EP 12158100A EP 12158100 A EP12158100 A EP 12158100A EP 2506665 A2 EP2506665 A2 EP 2506665A2
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EP
European Patent Office
Prior art keywords
frequencies
time interval
heating
heating frequency
frequency
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
EP12158100A
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German (de)
English (en)
Other versions
EP2506665B1 (fr
EP2506665A3 (fr
Inventor
Daniel Anton Falcon
Ignacio Garde Aranda
Oscar Lucia Gil
Daniel Palacios Tomas
Ramon Peinado Adiego
David Valeau Martin
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.)
BSH Hausgeraete GmbH
Original Assignee
BSH Bosch und Siemens Hausgeraete 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.)
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Application filed by BSH Bosch und Siemens Hausgeraete GmbH filed Critical BSH Bosch und Siemens Hausgeraete GmbH
Publication of EP2506665A2 publication Critical patent/EP2506665A2/fr
Publication of EP2506665A3 publication Critical patent/EP2506665A3/fr
Application granted granted Critical
Publication of EP2506665B1 publication Critical patent/EP2506665B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • H05B6/065—Control, e.g. of temperature, of power for cooking plates or the like using coordinated control of multiple induction coils

Definitions

  • the invention is based on a cooking device device according to the preamble of claim 1.
  • the publication DE 10 2005 021 888 A1 discloses an induction cooktop having at least two heating frequency units operated according to a particular method to at least substantially avoid intermodulation noise. According to this method, both heating-frequency units are operated at a fixed common frequency in a first time interval. In a second time interval, the two heating frequency units are each operated with their own frequency, wherein a frequency difference of both heating frequency units is between 14 kHz and 25 kHz. The method provides to minimize a flicker characteristic.
  • the object of the invention is in particular to provide a generic Garellavorraum that allows an advantageously flexible adjustment of a mean output power.
  • the object is achieved by the features of claim 1 and the method claim 9, while advantageous embodiments and refinements of the invention can be taken from the dependent claims.
  • the invention is based on a cooking device device with at least one first and at least one second heating frequency unit and with at least one control unit which is provided to set a respective average output power of the at least two heating frequency units while minimizing a flicker characteristic and the at least two heating frequency units in at least a first time interval with a first set of frequencies and in at least a second time interval with a second set of frequencies differently designed from the first set.
  • the frequencies of the first set of frequencies differ from one another by at least 14 kHz, in particular by at least 16 kHz and preferably by at least 17 kHz
  • the frequencies of the second set of frequencies differ by at least 14 kHz, in particular by at least 16 kHz and preferably differ by at least 17 kHz.
  • the cooking device device is preferably designed as a hob device and particularly advantageously as an induction hob device.
  • a "first time interval” and a "second time interval” are intended in particular to mean two temporally successive time intervals of a length greater than zero.
  • the designations "first" and “second” time interval are intended to serve only to distinguish the time intervals and, in particular, to provide no statement about a time sequence of the time intervals.
  • By “provided” is intended to be understood in particular specially programmed and / or designed and / or equipped.
  • heating frequency unit should in particular be understood to mean an electrical unit which generates an oscillating electrical current, preferably with a frequency of at least 1 kHz, in particular of at least 10 kHz and advantageously of at least 20 kHz, for operation of at least one heating unit.
  • a “heating unit” is to be understood in particular a unit which is intended to at least partially convert electrical energy into heat and thus in particular to heat a food to be cooked.
  • the heating unit comprises a radiant heater, a resistance heater and / or preferably an induction heater, which is intended to convert electrical energy indirectly via induced eddy currents into heat.
  • the heating frequency unit comprises in particular at least one inverter, which preferably comprises two switching units.
  • a “switching unit” is to be understood in particular as meaning a unit which is intended to interrupt a conduction path comprising at least part of the switching unit.
  • the switching unit is a bidirectional unipolar switch, which in particular allows a current flow through the switch along the conduction path in both directions and in particular an electrical Short circuits voltage in at least one polarity direction.
  • the inverter comprises at least two bipolar transistors with insulated gate electrode and particularly advantageously at least one damping capacitor.
  • a “conduction path” is to be understood as meaning, in particular, an electrically conductive conductor piece between two points.
  • electrically conductive is to be understood in particular with a specific electrical resistance of at most 10 -4 ⁇ m, in particular of at most 10 -5 ⁇ m, advantageously of at most 10 -6 ⁇ m and particularly advantageously of not more than 10 -7 ⁇ m at 20 ° C.
  • a "control unit” is to be understood in particular as meaning an electronic unit which is preferably at least partially integrated in a control and / or regulating unit of a cooking appliance, in particular an induction hob, and which preferably has an arithmetic unit and in particular in addition to the arithmetic unit a storage unit with a stored therein
  • Control program includes.
  • the control unit is preferably provided to control and / or regulate the heating frequency units with the aid of control signals, preferably electrical control signals.
  • a "control signal” should be understood in particular to mean a signal which, in particular in at least one operating state, triggers a switching operation of a heating frequency unit, in particular also indirectly.
  • an "electrical control signal” is to be understood in particular to mean a control signal having an electrical potential of at most 30 V, preferably of at most 20 V, particularly advantageously of at most 10 V and in particular of at least 5 V relative to a reference potential.
  • the control signal has a periodicity at least at times, in particular with a period of at most 1 ms, in particular of at most 0.1 ms and advantageously of at most 0.05 ms.
  • the control signal is at least substantially a rectangular signal, which in particular has two discrete values, preferably a switch-on value and a switch-off value.
  • each of the two values corresponds to a switching position of the heating frequency units and in particular their inverter.
  • a “frequency” of a heating frequency unit is to be understood in particular as the frequency of the control signal controlling the heating frequency unit.
  • a “set of frequencies” should be understood to mean, in particular, a plurality of frequencies, which in particular are all different from zero.
  • a number of frequencies in a set of frequencies corresponds to a number of heating frequency units to be operated simultaneously.
  • a “set of frequencies designed differently from the first set” should be understood in particular to mean a set of frequencies which comprises at least one frequency which differs from all the frequencies of the first set.
  • the at least two heating frequency units are "operated with a set of frequencies” should be understood in particular that it is provided to operate the first heating frequency unit continuously in a time interval with a first frequency from the set of frequencies and the second heating frequency unit in the same Operate time interval continuously with a second frequency different from the first frequency from the set of frequencies.
  • a heating frequency unit is “operated” should be understood in particular that the frequency of the heating frequency unit is different from zero.
  • the fact that a heating frequency unit is operated “continuously”, should be understood in particular that the heating frequency unit is continuously operated during a heating mode with a non-zero and preferably at least substantially fixed frequency.
  • An "at least largely immutable" frequency is to be understood in particular to mean a frequency which during the heating mode has a fluctuation of at most 10%, in particular of at most 5%, preferably of at most 1% and particularly advantageously of 0%.
  • the control unit is provided to control the at least two heating frequency units by means of the control signals in such a way that an average output power of one of the at least two heating frequency units corresponds at least largely to a target power selected by an operator.
  • a relative deviation of the set by the control unit average output power of the target power is not more than 20%, preferably not more than 10% and especially advantageously not more than 5%.
  • An "output power" of one of the at least two heating-frequency units should in particular be understood to mean a power which is supplied by the heating-frequency unit in at least one heating operating state.
  • a "mean output power" is to be understood in particular a time-averaged output power.
  • the control unit is in particular provided to make an adjustment of the average output power to the desired power while largely avoiding Intermodulationsgehoffschen.
  • a "substantial avoidance of intermodulation noise” is to be understood in particular as meaning that intermodulation noises having a frequency of less than 17 kHz, in particular less than 16 kHz and preferably less than 14 kHz at a distance of 1 m from the cooking appliance device have a maximum sound pressure level 20 dB, in particular of at most 10 dB, preferably of at most 5 dB, and particularly advantageously have a maximum of 0 dB.
  • the intermodulation sounds are inaudible by an average hearing operator.
  • a “flicker characteristic” is to be understood in particular as a parameter that represents a measure of flicker.
  • flicker is meant, in particular, a subjective impression of an instability of a visual perception, which is caused in particular by a light stimulus whose luminance and / or spectral distribution varies with time.
  • flicker can be caused by a voltage drop of a mains voltage.
  • the patch characteristic is an overall output power difference, preferably between two time points of two time intervals and particularly advantageously two adjacent time intervals.
  • a “total output” is understood to mean, in particular, a sum of output powers of all heating-frequency units at a particular point in time.
  • a “total output power difference” is to be understood in particular as a difference of the total output powers at two different points in time.
  • the control unit is provided to the Reduce flicker characteristic below a threshold.
  • the limit value is preferably a value defined by at least one statutory requirement and / or standard, in particular the standard DIN EN 61000-3-3.
  • an advantageously flexible adjustment of the mean output powers of the heating frequency units can be achieved, in particular since the frequency of the first heating frequency unit in the second time interval can be selected to be greater or smaller than the frequency of the second heating frequency unit.
  • a further control option can be provided, which can additionally be used in combination with other known control options.
  • At least the frequencies of the first set of frequencies and the frequencies of the second set of frequencies are at least 14 kHz, preferably at least 17 kHz and particularly advantageously at least 20 kHz.
  • intermodulation noises can be minimized particularly advantageous.
  • switching losses in the heating frequency units can be minimized.
  • control unit is provided in at least one operating state to periodically operate the at least two Schufrequenzajien with a period corresponding to the sum of the first time interval and the second time interval.
  • control unit is provided in at least one operating state to operate in a third time interval, the first heating frequency unit with the same frequency as the second heating frequency unit or at least one of the at least two heating frequency units.
  • third time interval is intended solely to distinguish it from the first and the second serve second time interval and in particular include no statement about a temporal order of the time intervals.
  • the fact that a heating frequency unit is "switched off" in a time interval should in particular be understood to mean that the heating frequency unit has at least substantially a negligibly low output power in the relevant time interval.
  • a "at least substantially negligibly low output power in the relevant time interval” shall be understood to mean in particular an output power which is at most 100 W, in particular at most 50 W, preferably at most 25 W and particularly advantageously 0 W, and / or during the time interval exclusively during a period of time is delivered, which corresponds to at most 50%, in particular at most 25%, preferably at most 15% and most preferably at most 10% of a length of the time interval.
  • an average output power can be provided, in particular at low desired powers, which at least substantially corresponds to the desired power.
  • a relative deviation of an average output power of one of the at least two heating frequency units from a setpoint power should be at most 20%, in particular at most 10%, and preferably at most 5%.
  • further options can be developed by setting the mean output powers of the at least two heating frequency units.
  • control unit is provided to operate one of the at least two heating frequency units in the first time interval with a smaller output power than in the second time interval and to operate the other of the at least two heating frequency units in the first time interval with a larger output power than in the second time interval.
  • control unit be provided to adapt the time intervals to desired powers of the at least two heating frequency units after a selection of the frequencies which minimize the flicker characteristic.
  • time intervals to desired powers of the at least two heating-frequency units should be understood in particular that a length of the time intervals is adapted, so that the average output power of one of the at least two heating frequency units of the desired power of this heating frequency unit comes as close as possible and is preferably identical to this. This ensures that legal requirements and / or standards regarding flicker are complied with and that a target performance is delivered.
  • control unit is provided to control the at least two heating frequency units in each case by means of a control signal and to adapt a duty cycle of at least one of the control signals in at least one operating state.
  • a ratio of a time duration in which the control signal assumes the switch-on value within a period duration to the period duration of the control signal is to be understood as a "duty cycle”.
  • an output of the heating frequency unit can be changed.
  • control unit is intended to "adjust a duty cycle of at least one of the control signals"
  • the control unit is intended to change the duty cycle of at least one of the control signals, thereby changing a fixed output power Frequency of a heating frequency unit.
  • the control unit is provided by changing the duty cycle of at least one control signal of at least two Schufrequenzappelen a total output of at least two Schufrequenzüen in at least one operating state temporally as constant as possible and particularly advantageous a maximum difference of total output power at two different times under a law and / or value prescribed by standards. In this way, further adjustment options for the control unit can be developed, whereby an ease of use can be advantageously increased.
  • control unit is provided to prioritize in favor of minimizing intermodulation noise and / or flicker, if operation of the at least two heating frequency units with selected target powers while largely avoiding Intermodulationsgehoffschen and / or flicker is impossible.
  • control unit is intended to "prioritize in favor of minimizing intermodulation noise and / or flicker", if an operation of at least two Schufrequenzöen with selected target powers while largely avoiding Intermodulationsgehoffschen and / or flicker is impossible, should be understood in particular be that is provided to perform an operation of at least one of the at least two Schufrequenzüen with a different output power from a desired output power, thereby minimizing Intermodulationsgehoffsche and / or flicker.
  • the average output power is always smaller than the target power or equal to the target power. As a result, unsafe operating conditions can be avoided.
  • a method is proposed with a cooking device device with at least one first and at least one second heating frequency unit, in particular according to one of the preceding claims, in which a respective average output power of the at least two heating frequency units is set while minimizing a flicker characteristic and the at least two heating frequency units in at least one first time interval with a first set of frequencies and in at least a second time interval with a second set of frequencies differently designed by the first set, wherein the frequencies of the first set of frequencies are at least 14 kHz, and more preferably at least 16 kHz differ by at least 17 kHz and get the frequencies of the second set of frequencies by at least 14 kHz, in particular by at least 16 kHz and preferably differ by at least 17 kHz.
  • the frequencies of the first set of frequencies are at least 14 kHz, and more preferably at least 16 kHz differ by at least 17 kHz and get the frequencies of the second set of frequencies by at least 14 kHz, in particular by at least 16 kHz and preferably differ by at least 17
  • a cooking appliance in particular a hob, proposed with a Garellavorraum invention.
  • the hob is an induction hob.
  • FIG. 1 shows a trained as induction hob 16 cooking appliance.
  • the induction hob 16 comprises a hob plate 18, in particular of a glass ceramic, on the two heating zones 20, 22 are marked in a known manner.
  • the hob plate 18 is arranged horizontally in an operational state of the induction hob 16 and provided for setting up cooking utensils.
  • touch-sensitive operating elements 26 and display elements 28 of an operating and display unit 30 of the induction hob 16 are marked on the hob plate 18 in a known manner.
  • the induction hob 16 further comprises a cooking device device having a first and a second heating frequency unit 10, 12 arranged below the hob plate 18 and having a control unit 14 arranged underneath the hob plate 18 FIG.
  • the control unit 14 is integrated in a control and regulation unit 32 of the induction hob 16.
  • One of the heating zone 20 associated and disposed below this induction heating unit is powered by the first heating frequency unit 10 with energy.
  • One of the heating zone 22 associated and arranged below this induction heating unit is powered by the second heating frequency unit 12 with energy.
  • An operator can select a heating stage for each of the heating zones 20, 22 by means of the operating and display unit 30, from which in each case a setpoint power P obj1 , P obj2 results for the two heating frequency units 10, 12.
  • the control unit 14 is provided to adapt a respective average output power P ave1 , P ave2 of the heating frequency units 10, 12 to the desired powers P obj1 , P obj2 while largely avoiding intermodulation noise, so that the selected heating levels of the heating zones 20, 22 can be achieved.
  • the control unit 14 is provided to minimize a flicker characteristic F, in particular under a prescribed by the standard DIN EN 61000-3-3 flicker limit G.
  • P 1 (t) designates the output power of the first heating frequency unit 10 at time t and P 2 (t) the output power of the second heating frequency unit 12 at time t.
  • the control unit 14 controls the first heating frequency unit 10 by means of a control signal V 1 (t) and the second heating frequency unit 12 by means of a control signal V 2 (t).
  • FIG. 2 shows by way of example a not to scale control signal V 1 (t) of the first heating frequency unit 10 in a Cartesian coordinate system.
  • An ordinate axis 36 has a control voltage V 1 and an abscissa axis 38 a time t.
  • the control signal V 1 (t) is during a first time interval T A a period T a square wave signal with a switch-V 0 , a switch-off of 0 volts and a frequency of f 1A .
  • the switch-on value V 0 is held during a switch-on time t 0A .
  • In the first time interval T A is a period of the square wave signal T 0A .
  • the frequency f 1A of the control signal V 1 (t) is calculated from a reciprocal of the period T 0A .
  • the frequency f 1A is usually between 20 kHz and 100 kHz.
  • a duty cycle D 1A of the control signal V 1 (t) in the first time interval T A is calculated from a quotient of the switch-on time t 0A divided by the period T 0A .
  • the control signal V 1 (t) during a second time interval T B of a period T is also a rectangular signal with the switch-on value V 0 and the switch-off value of 0 volts.
  • one frequency is f 1B .
  • the switch-on value V 0 is held during a switch-on time t 0B .
  • T B is a period of the square wave signal T 0B .
  • the frequency f 1B of the control signal V 1 (t) is calculated from a reciprocal of the period T 0B .
  • the frequency f 1B is usually between 20 kHz and 100 kHz.
  • a duty cycle D 1B of the control signal V 1 (t) in the second time interval T B is calculated from a quotient of the turn-on time t 0B divided by the period T 0B .
  • a time x separates the first time interval T A and the second time interval T B.
  • the control signal V 1 (t) is repeated.
  • a first of two switching units of the first heating frequency unit 10 is periodically switched in accordance with a periodic change of the turn-on value V 0 and the turn-off value.
  • a second switching unit of the first heating frequency unit 10 is periodically switched in an analogous, but time-shifted manner, so that a high-frequency alternating current to an operation of the heating zone 20 associated induction heating unit arises.
  • FIG. 3 shows in a Cartesian coordinate system by way of example two not-to-scale power frequency curves P 1 (f) and P 2 (f) for a first control variant.
  • the output powers P 1 and P 2 of the heating frequency units 10, 12 are plotted on an ordinate axis 42. On an abscissa axis 44, the frequency f is plotted.
  • the target powers P obj1 and P obj2 of the heating frequency units 10, 12 are set by an operator.
  • the first heating frequency unit 10 is operated at a frequency f 1A and the second heating frequency unit 12 is operated at a frequency f 2A .
  • the first heating frequency unit 10 is operated at a frequency f 1B and the second heating frequency unit 12 is operated at a frequency f 2B .
  • the frequencies f 1A and f 2A and f 1B and f 2B each form a set of frequencies (f 1A , f 2A ), (f 1B , f 2B ), where the two frequencies of a set of frequencies (f 1A , f 2A ), (f 1B , f 2B ) differ by at least 17 kHz.
  • the frequencies f 1A , f 2A , f 1B and f 2B are each at least 20 kHz.
  • FIG. 4 shows in a Cartesian coordinate system by way of example two not-to-scale power-time curves P 1 (t) and P 2 (t) for the control variant FIG. 3 ,
  • the output powers P 1 and P 2 of the heating frequency units 10, 12 are plotted on an ordinate axis 46.
  • the time t is plotted on an abscissa axis 48.
  • An in FIG. 4 illustrated course of the power-time curves P 1 (t) and P 2 (t) is periodically traversed in a heating operating state of the heating frequency units 10, 12 with the period T.
  • the first heating frequency unit 10 is operated in the first time interval T A with a larger output power P 1 than in the second time interval T B.
  • the second heating frequency unit 12 is operated in the first time interval T A with a smaller output power P 2 than in the second time interval T B.
  • the control unit 14 sets the frequencies f 1A , f 2A , f 1B and f 2B and the lengths of the time intervals T A and T B so that the average output powers P ave1 and P ave2 of the two heating frequency units 10, 12 respectively the desired power P obj1 and P obj2 , intermodulation noise is largely avoided and the flicker characteristic F is kept below the flicker limit value G.
  • F P 1 0 ⁇ t ⁇ x + P 2 0 ⁇ t ⁇ x - P 1 0 ⁇ t ⁇ T - P 2 0 ⁇ t ⁇ T ⁇ G .
  • the last condition takes into account additional limits for the frequencies f 1A , f 2A , f 1B and f 2B .
  • a curve-specific minimum frequency f min1 and f min2 and thus a maximum achievable output power P 1 , P 2 for each heating frequency unit 10, 12.
  • a maximum frequency f max given by electronic restrictions and thus minimal in a continuous operation achievable output power P 1 , P 2 for each heating frequency unit 10, 12.
  • the time intervals T A and T B are adjusted until the mean output powers P ave1 and P ave2 of the two heating frequency units 10, 12 respectively Target performance P obj1 and P obj2 correspond.
  • a correction can be made in real time, in order to respond to power fluctuations caused, for example, by heating.
  • the output power P 2 of the second heating frequency unit 12 is plotted.
  • the frequency f is plotted.
  • the control unit 14 can adjust the output power P 2 of the second heating frequency unit 12. In this way, in particular a lowering of the output power P 2 at a fixed frequency f 2A of the second heating frequency unit 12 can be achieved.
  • the control unit 14 may be additionally provided to adjust the duty cycles D 1A , D 2A , D 1B and D 2B to satisfy the above conditions.
  • the control unit 14 is provided to search frequencies f 1A , f 2A , f 1B , f 2B for which the flicker characteristic F is less than or equal to the flicker limit value G.
  • the control unit 14 is intended to additionally supply at least one of the two heating-frequency units 10, 12 a below the target power P obj1 , P obj2 lying average output power P ave1 , P ave2 to operate. That is, at least one of the target powers P obj1 , P obj2 is lowered by the control unit 14 to satisfy the above conditions.
  • FIG. 6 shows in a Cartesian coordinate system by way of example two not-to-scale power frequency curves P 1 (f) and P 2 (f) for a first control variant.
  • the output powers P 1 and P 2 of the heating frequency units 10, 12 are plotted.
  • the frequency f is plotted.
  • the target powers P obj1 and P obj2 of the heating frequency units 10, 12 are set by an operator. Without limiting the generality, it is assumed that the setpoint power P obj2 for the second heating frequency unit 12 is so small that a setpoint frequency f obj2 assigned to the setpoint power P obj2 is greater than the maximum frequency f max .
  • the second heating frequency unit 12 must be turned off during a third time interval T C , so that the average output power P ave2 the target power P obj2 can be adjusted.
  • the first heating frequency unit 10 is operated at a frequency f 1A and the second heating frequency unit 12 is operated at a frequency f 2A .
  • the second time interval T B the first heating frequency unit 10 is operated at a frequency f 1B and the second heating frequency unit 12 is operated at a frequency f 2B .
  • the third time interval T C the first heating frequency unit 10 is operated at a frequency f 1C identical to the frequency f 1B and the second heating frequency unit 12 is switched off.
  • the frequencies f 1A and f 2A as well as f 1B and f 2B each form a set of frequencies, the two frequencies of a set differing by at least 17 kHz.
  • the frequencies f 1A , f 2A , f 1B and f 2B are each at least 20 kHz.
  • FIG. 7 shows in a Cartesian coordinate system by way of example two not-to-scale power-time curves P 1 (t) and P 2 (t) for the control variant FIG. 6 ,
  • the output powers P 1 and P 2 of the heating frequency units 10, 12 are plotted on an ordinate axis 58.
  • the time t is plotted on an abscissa axis 60.
  • An in FIG. 7 illustrated course of the power-time curves P 1 (t) and P 2 (t) is periodically traversed in a heating operating state of the heating frequency units 10, 12 with the period T.
  • the first heating frequency unit 10 is operated in the first time interval T A with a larger output power P 1 than in the second time interval T B.
  • the second heating frequency unit 12 is operated in the first time interval T A with a smaller output power P 2 than in the second time interval T B.
  • the control unit 14 sets the frequencies f 1A , f 2A , f 1B and f 2B and the lengths of the time intervals T A , T B and T C such that the average output powers P ave1 and P ave2 of the two heating-frequency units 10, 12 correspond to the desired power P obj1 and P obj2 , intermodulation noise is largely avoided and the flicker characteristic F is kept below the flicker limit G.
  • the above-mentioned equivalent conditions additionally take into account the third time interval T C.
  • both Wiener filter 10, 12 are operated in a third time interval T C with a common frequency f C or that both Wienrequenzakuen 10, 12 are turned off.
  • an adaptation of the duty cycles D 1A , D 2A , D 1B and D 2B as well as of duty cycles D 1C and D 2C of the third time interval T C can also be provided here.
  • the control unit 14 is intended to test various control variants and to apply the control variant which is most favorable for the given desired powers P obj1 , P obj2 .
  • the control unit 14 favors operation of the heating frequency units 10, 12 while largely avoiding intermodulation noise and minimizing flicker.
  • an induction hob can also have more than two induction heating units, wherein in each case a plurality of induction heating units can be connected via a respective switching unit with a heating frequency unit. Furthermore, it is also conceivable that frequencies of a set of frequencies always differ by exactly 17 kHz. Furthermore, the control method described here can also be combined with other control methods which are known to a person skilled in the art and appear reasonable.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Induction Heating Cooking Devices (AREA)
  • Electric Ovens (AREA)
  • Control Of Resistance Heating (AREA)
EP12158100.3A 2011-03-28 2012-03-05 Dispositif d'appareil de cuisson Active EP2506665B1 (fr)

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ES201130458 2011-03-28

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EP2506665A2 true EP2506665A2 (fr) 2012-10-03
EP2506665A3 EP2506665A3 (fr) 2013-05-08
EP2506665B1 EP2506665B1 (fr) 2017-05-24

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020046048A1 (fr) 2018-08-30 2020-03-05 Lg Electronics Inc. Dispositif de chauffage par induction et son procédé de commande
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
EP4125304A1 (fr) * 2021-07-26 2023-02-01 E.G.O. Elektro-Gerätebau GmbH Procédé permettant de faire fonctionner un ustensile de cuisine et ustensile de cuisine
EP4195875A1 (fr) * 2021-12-10 2023-06-14 SABAF S.p.A. Plaque de cuisson à induction et procédé de commande de plaque de cuisson à induction
EP4210435A1 (fr) * 2022-01-10 2023-07-12 E.G.O. Elektro-Gerätebau GmbH Procédé et dispositif de mesure de la puissance sur une bobine de chauffage par induction
EP4132220A4 (fr) * 2020-03-27 2024-05-01 LG Electronics, Inc. Dispositif de chauffage par induction et son procédé de commande

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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
WO2020046048A1 (fr) 2018-08-30 2020-03-05 Lg Electronics Inc. Dispositif de chauffage par induction et son procédé de commande
EP4132220A4 (fr) * 2020-03-27 2024-05-01 LG Electronics, Inc. Dispositif de chauffage par induction et son procédé de commande
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EP4195875A1 (fr) * 2021-12-10 2023-06-14 SABAF S.p.A. Plaque de cuisson à induction et procédé de commande de plaque de cuisson à induction
EP4210435A1 (fr) * 2022-01-10 2023-07-12 E.G.O. Elektro-Gerätebau GmbH Procédé et dispositif de mesure de la puissance sur une bobine de chauffage par induction

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