EP2469971B1 - Gargerätevorrichtung - Google Patents

Gargerätevorrichtung Download PDF

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Publication number
EP2469971B1
EP2469971B1 EP11194593.7A EP11194593A EP2469971B1 EP 2469971 B1 EP2469971 B1 EP 2469971B1 EP 11194593 A EP11194593 A EP 11194593A EP 2469971 B1 EP2469971 B1 EP 2469971B1
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EP
European Patent Office
Prior art keywords
unit
frequency
power output
cooking device
heat 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.)
Active
Application number
EP11194593.7A
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German (de)
English (en)
French (fr)
Other versions
EP2469971A1 (de
Inventor
Ignacio Garde Aranda
Oscar Gracia Campos
Sergio Llorente Gil
Paul Muresan
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
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BSH Hausgeraete GmbH
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Publication date
Application filed by BSH Hausgeraete GmbH filed Critical BSH Hausgeraete GmbH
Publication of EP2469971A1 publication Critical patent/EP2469971A1/de
Application granted granted Critical
Publication of EP2469971B1 publication Critical patent/EP2469971B1/de
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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 EP 1 951 003 B1 discloses an induction hob with at least two heating frequency units operated according to a particular method to prevent intermodulation noises. According to this method, both heating-frequency units are operated at an identical first frequency in a first time period. In a second period of time, one heating frequency unit is switched off, while the other heating frequency unit is operated at a second frequency. The two frequencies as well as the relative lengths of the two time segments are adjusted so that a mean output power of each heating frequency unit corresponds to an operator selected heating power.
  • the object of the invention is in particular to provide a generic Garellavorraum with a continuous power output possible.
  • 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 two heating frequency units and with at least one control unit, which is provided to set in each case an average output power of the heating frequency units.
  • the control unit is provided for effecting an adjustment of the mean output power of at least one of the heating frequency units using a duty cycle of a control signal.
  • the cooking device device is designed as a hob device and particularly advantageous as an induction hob device.
  • a “heating frequency unit” is to be understood as meaning 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.
  • heating unit is to be understood as 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 at least one inverter, which preferably comprises two switching units.
  • switching unit is to be understood as a unit which is intended to interrupt a line 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 short-circuits an electrical 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.
  • control unit is to be understood as 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.
  • the control unit comprises a computing unit and in particular in addition to the computing unit, a memory unit with a control program stored therein.
  • the control unit is provided to the Schufrequenzajien to control and / or regulate by means of electrical control signals.
  • An electrical "control signal” is to be understood in particular a signal having an electrical voltage of at most 30 V, preferably of at most 20 V and more preferably of at most 10 V, which is supplied to the inverters of the heating frequency units in particular in at least one operating state.
  • 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 a square-wave signal, which in particular can assume two values, preferably a switch-on value and a switch-off value.
  • each of the two values corresponds to a switching position of the inverters.
  • 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.
  • An “output power” is to be understood, in particular, as meaning an electrical power which, in at least one operating state, is transmitted from a heating frequency unit to a heating unit.
  • the output power is transmitted by an electric current.
  • the output power is preferably converted in the heating unit at least partially and particularly advantageously at least to a large extent into a heat flow.
  • a "mean output power" is to be understood in particular a time-averaged output power.
  • the control unit is provided to set the average output power such that a selected by an operator heating power is achieved, in particular for each heating zone of a hob.
  • a "duty cycle” should be understood to mean 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.
  • the output power can be changed.
  • control unit is intended to "set the average output power of at least one of the heating frequency units using a duty cycle a control signal "
  • control unit is arranged to change the duty cycle of at least one of the heating frequency units at a setting of the average output power, thereby achieving a change in the instantaneous output power Modification of the duty cycle of at least one of the two heating frequency units to keep a total output of both heating frequency units as constant in time as possible in at least one operating state and particularly advantageous to suppress an overall output power difference at two different time points below a legal and / or prescribed by standards value
  • total output A sum of the output powers of all heating-frequency units at a certain point in time is to be understood by a “total output power difference” in particular a difference of the total benefits at two different times.
  • a power output as continuous as possible can be made possible. Furthermore, an output power of the heating rate units selected by an operator can be advantageously delivered accurately. Furthermore, a simple algorithm can be provided. Furthermore, energy efficiency can be increased because operation of the heating frequency units close to a resonance frequency is enabled.
  • the control unit is provided to use the duty cycle of the heating frequency unit, which requires a highest frequency to achieve the average output power in a continuous operation.
  • an advantageously continuous power output can be achieved.
  • flicker can be minimized.
  • flicker is meant in particular a subjective impression of instability of a visual perception, which is caused in particular by a light stimulus whose luminance or spectral distribution varies with time.
  • flicker can be caused by a voltage drop of a mains voltage.
  • the control unit is provided to reduce a patch parameter using the duty cycle.
  • a "flicker characteristic" is to be understood in particular as a parameter that represents a measure of flicker.
  • the flicker characteristic is preferably the total output power difference, preferably between two times of two time ranges and particularly advantageously two adjacent time ranges.
  • the control unit is provided to reduce the flicker characteristic under a legal and / or by standards, in particular by the standard DIN EN 61000-3-3 prescribed limit. As a result, flicker can be advantageously reduced.
  • control unit is provided to permanently operate at least one of the heating frequency units.
  • control unit is intended to "permanently operate" at least one of the heating frequency units, it should be understood in particular that at least one of the heating frequency units has a non-zero instantaneous output power in at least one operating state at all times. As a result, an advantageously uniform power output can be achieved.
  • the control unit is provided to operate the heating frequency unit continuously with a first frequency.
  • the control unit is intended to "continuously operate the heating frequency unit with a first frequency"
  • the heating frequency unit is operated in at least one operating state at any time with the same, non-zero, first frequency.
  • an output power of the heating frequency unit in the operating state is constant and particularly advantageously identical to the mean output power of the heating frequency unit. In this way, a particularly advantageous uniform power output can be achieved.
  • control unit is provided to permanently operate the one heating frequency unit which requires a minimum frequency to achieve the average output power in a continuous operation.
  • a control algorithm can advantageously be simplified.
  • flicker can be reduced.
  • control unit is provided to operate at least one of the heating frequency units at least temporarily with a second frequency.
  • the first frequency and the second frequency are identical.
  • intermodulation noises can be excluded.
  • a frequency spacing between the first frequency and the second frequency is preferably at least 15 kHz, in particular at least 16 kHz and particularly advantageously at least 17 kHz.
  • both frequencies are preferably greater than 30 kHz, in particular greater than 32 kHz and particularly advantageously greater than 34 kHz. As a result, intermodulation noises can be advantageously reduced.
  • the control unit is provided to switch off at least one of the heating frequency units at least temporarily.
  • the control unit is provided to "at least temporarily turn off at least one of the heating frequency units" should be understood in particular that at least one of the Schufrequenzüen in at least one operating state alternately at least substantially has an output power of zero and a substantially nonzero output power.
  • the control signal has the switch-off value.
  • a method is proposed with a cooking appliance device with at least two heating frequency units, in each of which an average output power of the heating frequency units is set, wherein an adjustment of the mean output power of at least one of the heating frequency units is made using a duty cycle of a control signal. This allows the most continuous power output possible.
  • 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, are marked in the known manner three heating zones 20, 22, 24.
  • 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 with two heating frequency units 10, 12 arranged below the hob plate 18 and with a control unit 14 arranged below 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 heating frequency unit 10 with energy.
  • One of the heating zone 22 associated and arranged below this induction heating unit and another of the heating zone 24 associated and arranged below this induction heating unit are supplied via a switching unit 34 of the cooking appliance by the heating frequency unit 12 with energy.
  • the switching unit 34 is provided for operating the two induction heating units assigned to the two heating zones 22, 24 in a known manner in a time division multiplex controlled by the control unit 14.
  • the control unit 14 is designed to set a respective average output power P 0A , P 0B of the heating frequency units 10, 12, so that the selected heating levels of the heating zones 20, 22, 24 are achieved, in particular using the time multiplex, and intermodulation noises are avoided.
  • the control unit 14 controls the heating frequency unit 10 by means of a control signal V A (t) and the heating frequency unit 12 by means of a control signal V B (t).
  • Fig. 2 shows an example of a non-to-scale control signal V B (t) in a Cartesian coordinate system.
  • On an ordinate axis 36 is a control voltage V B and plotted on an abscissa axis 38 a time t.
  • the control signal V B (t) during a sub-interval T 2 of a time interval T is a rectangular signal with a switch-on value V 0 and a switch-off value of 0 volts.
  • the switch-on value V 0 is held during a switch-on time t 0 .
  • a period of the rectangular signal is T 0 .
  • the turn-off value is held.
  • a frequency f of the control signal V B (t) is calculated from a reciprocal of the period T 0 .
  • the frequency f is usually between 30 kHz and 100 kHz.
  • a duty cycle D B of the control signal V B (t) is calculated from a quotient of the switch-on time t 0 divided by the period T 0 .
  • An envelope 40 of the control signal V B (t) is shown in dashed lines. While V B (t) takes the form of the square wave signal, an inverter of the heating frequency unit 12 is periodically switched in accordance with a periodic change of the turn-on value V 0 and the turn-off value. This results in a high-frequency alternating current to an operation of the heating zones 22, 24 associated Indutechnischsweikien.
  • Fig. 3 shows in a Cartesian coordinate system by way of example two power-frequency curves P A (f) and P B (f). On an ordinate axis 42 output powers P A and P B of the heating frequency units 10, 12 are plotted. On an abscissa axis 44, the frequency f is plotted.
  • the heating frequency unit 10 which requires a smaller frequency f to achieve the average output power P 0A in a continuous operation, is operated continuously at a fixed frequency f 0 .
  • the heating frequency unit 12 is switched off in the partial interval T 1 and is also operated in the partial interval T 2 with the frequency f 0 .
  • Fig. 4 shows in a Cartesian coordinate system by way of example two power-time curves P A (t) and P B (t).
  • P A and P B of the Schufrequenzaiseen 10 applied 12th
  • the time t is plotted on an abscissa axis 48.
  • Fig. 4 shows how the heating frequency unit 10 in the first sub-interval T 1 is operated at the frequency f 0 , while the heating frequency unit 12 is turned off.
  • both Schufrequenzüen 10, 12 are operated at the same frequency f 0 .
  • intermodulation hum can be effectively avoided.
  • the instantaneous output power P A is always identical to the mean output power P 0A .
  • the instantaneous output power P B during the sub-interval T 2 is always greater than the average output power P 0B .
  • control unit 14 is provided to set a time x, which divides the time interval T in the sub-intervals T 1 and T 2 , such that the heating frequency unit 12 in a pulsed operation with a pulse interval corresponding to the sub-interval T 2 , the average output power P 0B supplies.
  • Fig. 5 shows in a Cartesian coordinate system by way of example a power frequency curve family P B '(f).
  • the frequency f is plotted.
  • Fig. 5 shows how by adjusting the duty cycle D B at a fixed frequency f, an adjustment of the output power P B can be made.
  • D A be a duty cycle of the heating frequency unit 10 and D B a duty cycle of the heating frequency unit 12 during the sub-interval T 2 .
  • the control unit 14 is provided to make an adjustment of the duty D A and D B , thereby reducing a flicker characteristic F, in particular one in the European standard EN 61000-3-3 prescribed limit.
  • the duty cycle D B of the heating frequency unit 12 is lowered, in order thereby to achieve an extension of the second subinterval T 2 .
  • an adaptation of the duty cycle D A can be made in addition.
  • an induction hob can also have four induction heating units, wherein two of the induction heating units are each connected via a switching unit to a heating frequency unit.
  • two induction heating units assigned to a heating frequency unit can also be operated by any other method that appears appropriate to a person skilled in the art.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Induction Heating Cooking Devices (AREA)
  • Electric Stoves And Ranges (AREA)
EP11194593.7A 2010-12-27 2011-12-20 Gargerätevorrichtung Active EP2469971B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ES201031949 2010-12-27

Publications (2)

Publication Number Publication Date
EP2469971A1 EP2469971A1 (de) 2012-06-27
EP2469971B1 true EP2469971B1 (de) 2016-11-16

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ID=45470298

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EP11194593.7A Active EP2469971B1 (de) 2010-12-27 2011-12-20 Gargerätevorrichtung

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EP (1) EP2469971B1 (es)
ES (1) ES2608323T3 (es)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2945461B1 (de) * 2014-03-24 2017-05-10 BSH Hausgeräte GmbH Gargerätevorrichtung
ES2754813A1 (es) * 2018-10-17 2020-04-20 Bsh Electrodomesticos Espana Sa Dispositivo de Aparato de cocción
CN113885615B (zh) * 2020-07-03 2023-03-24 九阳股份有限公司 一种间歇加热的控制方法及烹饪器具

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2201937B1 (es) * 2003-11-03 2005-02-01 Bsh Electrodomesticos España, S.A. Procedimiento para el funcionamiento de un circuito convertidor.
ES2338057T5 (es) * 2007-01-23 2023-03-09 Whirlpool Co Método de control para una placa de cocina de inducción y placa de cocina de inducción adaptada para llevar a cabo dicho método
PL2200398T3 (pl) * 2008-12-22 2012-01-31 Fagorbrandt Sas Sposób zasilania mocą dwóch induktorów oraz urządzenie do gotowania realizujące wspomniany sposób

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

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Publication number Publication date
EP2469971A1 (de) 2012-06-27
ES2608323T3 (es) 2017-04-07

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