EP2945461B1 - Dispositif d'appareil de cuisson - Google Patents

Dispositif d'appareil de cuisson Download PDF

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Publication number
EP2945461B1
EP2945461B1 EP15159602.0A EP15159602A EP2945461B1 EP 2945461 B1 EP2945461 B1 EP 2945461B1 EP 15159602 A EP15159602 A EP 15159602A EP 2945461 B1 EP2945461 B1 EP 2945461B1
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EP
European Patent Office
Prior art keywords
frequency
inverters
control unit
khz
inverter
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EP15159602.0A
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German (de)
English (en)
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EP2945461A1 (fr
Inventor
Carlos Franco Gutierrez
Sergio Llorente Gil
Carlos Sagües Blázquiz
Fernando Sanz Serrano
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BSH Hausgeraete GmbH
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BSH Hausgeraete GmbH
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Publication of EP2945461A1 publication Critical patent/EP2945461A1/fr
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/06—Control, e.g. of temperature, of power
    • H05B6/062—Control, e.g. of temperature, of power for cooking plates or the like
    • H05B6/065—Control, e.g. of temperature, of power for cooking plates or the like using coordinated control of multiple induction coils

Definitions

  • the invention relates to a Garellavoroplasty according to claim 1.
  • a Garellavorschiques with two inverters each operating a formed as an induction heating element heating element.
  • a first of the inverters are operated at a first frequency and a second of the inverters are operated at a second frequency in an operating state within a first time interval.
  • the first frequency and the second frequency each have at least a value of 14 kHz in the first time interval.
  • the first frequency and the second frequency are selected according to the condition that a difference between the first frequency and the second frequency has either at least a value of 14 kHz or a maximum of 2 kHz.
  • intermodulation hum in the first time interval can not be necessarily avoided because, for example, a difference of harmonics of the first frequency and the second frequency has a value in a frequency range audible to a human, which is in accordance with WO 2005/043737 A2 In particular, between 2 kHz and 14 kHz is located, could have.
  • at least one of the inverters is switched off in the operating state in order to adapt an average output power of each of the inverters to a desired power.
  • the inverters are therefore operated discontinuously when considering both time intervals.
  • the object of the invention is in particular to provide a generic device with improved properties in terms of high comfort.
  • the object is achieved by the features of claim 1, while advantageous embodiments and modifications of the invention can be taken from the dependent claims.
  • a cooking device device in particular an induction hob device, with at least two inverters and with a control unit which, when heating at least one heating configuration in at least one operating state is provided to continuously operate a first inverter of the at least two inverters with a first frequency and a second inverter of the at least two inverters with a second frequency and to adapt an average output power of each of the at least two inverters to a particular respective predetermined target power, and which is arranged to select the first frequency and the second frequency according to at least the condition that an amount of a difference of an integer multiple of the first frequency and an integer multiple of the second frequency either a value of at least 14 kHz to avoid intermodulation hum , in particular of at least 15 kHz, advantageously of at least 16 kHz, preferably of at least 17 kHz and in particular of at least 20 kHz, or at least substantially assumes the value zero.
  • a “cooking appliance device” is to be understood in particular as meaning at least one part, in particular a subassembly, of a cooking appliance, in particular an induction hob.
  • the cooking appliance device may also comprise the entire cooking appliance, in particular the entire induction hob.
  • 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 and which is preferably provided for controlling and / or regulating at least the at least two inverters by means of electrical control signals.
  • the control unit preferably comprises a computing unit and, in particular in addition to the computing unit, a memory unit with a control and / or regulating program stored therein, which is intended to be executed by the computing unit.
  • control signal is intended in particular to be understood as a signal having an electrical voltage of at most 30 V, preferably not more than 20 V and particularly advantageously not more than 10 V, which supplies the control unit to at least one of the at least two inverters, in particular in the at least one operating state ,
  • the control signal has, in particular at least at times, a periodicity, in particular with a period of at most 1 ms, in particular of a maximum of 0.1 ms and advantageously of at most 0.05 ms.
  • control signal is at least substantially a square-wave signal, which in particular can assume two values, preferably a switch-on value and a switch-off value, wherein preferably each of the two values corresponds to a switching position of an inverter of the at least two inverters.
  • a “frequency" of an inverter should be understood in particular the frequency of the inverter supplied control signal.
  • heating configuration is to be understood in particular as an arrangement of at least two heating elements which are in operation at a given time, wherein in particular each of the at least two heating elements is supplied with energy, in particular electrical energy, by at least one of the at least two inverters ,
  • the control unit is provided to heat a first heating configuration at a first time and to operate a second heating configuration in at least one second time different from the at least one first time, which differs in particular from the first heating configuration.
  • the control unit when the first heating configuration is heated, the control unit could be provided to operate a first inverter of the at least two inverters continuously with a first frequency and a second inverter of the at least two inverters continuously at a second frequency, wherein the at least two inverters in particular a first Can operate group of heating elements.
  • the control unit When heating the second heating configuration, the control unit could be provided to operate the first inverter continuously at a third frequency and the second inverter continuously at a fourth frequency, wherein the at least two inverters in particular a second group of heating elements, in particular of the first group of heating elements could operate.
  • control unit when heating at least one heating configuration, to operate at least one particular inverter "continuously" at a specific frequency, it should be understood that the control unit controls the at least one particular inverter at any time during heating which operates at least one heating configuration having the specific frequency, wherein the at least one particular inverter advantageously has a non-zero, in particular average, output power at any time during the heating of the at least one heating configuration.
  • the specific frequency during heating of the at least one heating configuration varies by a maximum of 10%, in particular by a maximum of 5% and advantageously by a maximum of 2% of a value of the frequency and / or by a value of at most 1 kHz, in particular of at most 0.5 kHz , preferably of at most 0.3 kHz and preferably of at most 0.1 kHz.
  • a "mean output power" of an inverter should in particular be an arithmetic mean value of at least two Output powers of the inverter are understood, with an averaging advantageously over a time interval of at least 1 s, in particular of at least 2 s and advantageously of at least 5 s.
  • a “target power” should be understood in particular to be aimed for, in particular to be achieved value of a power.
  • a "predetermined” target power is to be understood in particular as meaning a target power which is determined directly by an operator, for example by inputting a value of a power by means of an operating unit, and / or which is indirectly determined by an operator, for example by selecting a cooking program the control unit and / or by means of setting a heating level by means of the control unit, and / or which is determined in particular by an electronic unit, such as by the control unit and / or by another control unit and / or by a computer.
  • the control unit is in particular provided to set a first setpoint power for the first inverter and a second setpoint power for the second inverter depending on an operator input.
  • control unit is advantageously provided to adapt an average output power of the first inverter, in particular during the heating of the at least one heating configuration to the first target power and an average output power of the second inverter, in particular during heating of the at least one heating configuration to the second target power.
  • the cooking appliance device comprises in particular at least two heating elements, which are arranged in particular adjacent to one another, wherein the at least two heating elements are magnetically coupled to each other at least in the at least one operating state and advantageously in each operating state.
  • This can be effected in particular by a concentric arrangement of the at least two heating elements.
  • the at least two heating elements could in particular be arranged directly next to one another, for example in the form of a cooktop matrix.
  • further arrangements of the at least two heating elements that appear appropriate to a person skilled in the art are conceivable in which the at least two heating elements are magnetically coupled at least in the at least one operating state.
  • the inverter is provided in particular for supplying at least one first heating element of the at least two heating elements and the at least one second inverter is provided in at least one operating state, in particular for supplying at least one second heating element of the at least two heating elements.
  • “provided” is intended to be understood in particular specially programmed, designed and / or equipped.
  • the fact that an object is intended for a specific function should in particular mean that the object fulfills and / or executes this specific function in at least one application and / or operating state.
  • a high level of comfort in particular for an operator, can be achieved by the configuration according to the invention.
  • This can be achieved in particular by avoiding noise in the form of intermodulation hum in the at least one operating state.
  • an average output power can be adapted at any time to a predetermined desired power, whereby an advantageous cooking result can be achieved.
  • an easy to program algorithm can be provided, which in particular low costs can be achieved.
  • a rapid change of parameters, in particular the frequencies, can be avoided.
  • control unit be provided to use duty cycles of control signals of the at least two inverters in the at least one operating state for adapting the mean output powers of the at least two inverters for given fixed frequencies.
  • control unit preferably changes the duty cycles of the control signals provided for controlling the at least two inverters and advantageously leaves the frequencies of the control signals constant.
  • a "given fixed" frequency should in particular be understood to mean a frequency which varies in the at least one operating state and in particular within a time interval by a maximum of 10%, in particular by a maximum of 5% and advantageously by a maximum of 2% of a value of the frequency, and / or in the at least one operating state and in particular within a time interval by a value of at most 1 kHz, in particular of maximally 0.5 kHz, advantageously of a maximum of 0.3 kHz and preferably of a maximum of 0.1 kHz.
  • the time interval here has a duration of at least 10 s, in particular of at least 20 s, advantageously of at least 40 s, particularly advantageously of at least 60 s and preferably of at least 120 s.
  • a ratio of a time duration in which the control signal assumes the switch-on value within a period of the control signal to the period of the control signal is to be understood as a "duty cycle".
  • the duty cycle assumes values in a range between zero inclusive and one inclusive.
  • an output power of an inverter of the at least two inverters, in particular at a duty cycle of 0.5 is maximally advantageously mirror-symmetrical with respect to the duty cycle of 0.5, wherein, for example, an output power at a duty cycle of zero corresponds to an output power at a duty cycle of one.
  • the average output powers of the at least two inverters can in particular be adapted in a simple manner.
  • the first frequency and the second frequency can be optimized.
  • control unit could be provided to change the duty cycle within a range of 0.5 in the at least one operating state, in particular between 0.3 and 0.7, or advantageously between 0.4 and 0.6, in particular one to achieve high electrical efficiency.
  • control unit is provided to use in the at least one operating state a duty cycle in a range greater than zero and less than one, preferably greater than zero and less than or equal to 0.5.
  • the control unit is in this case provided, in particular, to use a soft adaptation of the duty cycle, in which advantageous changes between two successive time intervals are small, and the duty cycle, in particular after a lapse of a period of 10 ms in each case by a maximum of 5%, in particular by a maximum of 3%, advantageously by a maximum of 2%, particularly advantageously by a maximum of 1%, preferably by a maximum of 0.5% and advantageously by a maximum of 0.1% of a value of the duty cycle to change.
  • a soft adaptation of the duty cycle in which advantageous changes between two successive time intervals are small
  • the duty cycle in particular after a lapse of a period of 10 ms in each case by a maximum of 5%, in particular by a maximum of 3%, advantageously by a maximum of 2%, particularly advantageously by a maximum of 1%, preferably by a maximum of 0.5% and advantageously by a maximum of 0.1% of a value of the duty cycle to change.
  • the two integer multiples may in particular both assume a value of one, wherein the two frequencies in particular may be substantially identical.
  • at least one of the integer multiples assumes at least the value two, wherein one of the frequencies is preferably a harmonic of another of the frequencies.
  • first frequency and the second frequency that appear appropriate to a person skilled in the art are conceivable.
  • one of the frequencies could take on a value of at most the lower limit of the audible frequency range for a human and another of the frequencies could assume a value of at least the upper limit of the audible frequency range for a human.
  • the first frequency and the second frequency each preferably assume a value of at least 14 kHz, in particular of at least 15 kHz, advantageously of at least 16 kHz, preferably of at least 17 kHz and in particular of at least 20 kHz, whereby intermodulation humbeaming in particular to a simple and / or safe way can be avoided.
  • a difference between the first frequency and the second frequency may in particular assume a value of at least substantially zero in the at least one operating state.
  • the first frequency and the second frequency are at least substantially different.
  • a difference between the first frequency and the second frequency is an amount of at least 2 kHz, in particular of at least 3 kHz, advantageous of at least 4 kHz, and preferably of at least 6 kHz, and / or that an amount of a difference between the first frequency and the second frequency is at least 15%, preferably at least 20%, more preferably at least 25% and preferably at least 30% of a value greater of the two frequencies.
  • the first frequency and the second frequency differ in particular by more than a tolerance when adjusting the respective average output powers. As a result, in particular a high degree of flexibility can be achieved.
  • the cooking appliance device comprises at least one damping capacitor, which is in particular connected directly parallel to at least one switch and preferably to exactly one switch of one of the at least two inverters and has a capacitance value of at most 1 nF, in particular of at most 500 pF, advantageously of maximum 100 pF and preferably at most 10 pF.
  • a damping capacitor connected in parallel with the at least one switch
  • further arrangements of capacitors which appear sensible to a person skilled in the art are conceivable.
  • arbitrary series connections and / or parallel circuits of capacitors are conceivable, which are connected in particular directly parallel to the at least one switch and preferably to exactly one switch and have a capacitance value of at most 1 nF.
  • a "switch” should in particular be understood to mean an element which is intended to produce and / or to separate an electrically conductive connection between at least two points, in particular contacts of the switch.
  • the switch is designed in particular as an electrical element and preferably has at least one control contact for receiving a control signal, wherein the switch can be actuated via the control contact and in particular between the at least two contacts can be switched, in particular in dependence on the control signal generated by the control unit.
  • the control unit operates the at least two inverters during the heating of the at least one heating configuration, in particular in each case continuously with a particular given fixed frequency.
  • the control unit may be provided to operate at least one inverter of the at least two inverters discontinuously in at least one further operating state, in particular different from the at least one operating state, in particular in a lower and / or upper limit range of the duty cycle.
  • the duty cycle takes in the lower limit range in particular a value of at most 0.2, advantageously of at most 0.15 and preferably of at most 0.1 and in the upper
  • the limit range has a value of at least 0.8, advantageously of at least 0.85 and preferably of at least 0.9.
  • control unit is intended to "operate discontinuously" at least one inverter of the at least two inverters in at least one further operating state
  • control unit in the at least one further operating state at least temporarily, at least one inverter, in particular over a period of at least 2, in particular of at least 4 and advantageously of at least 6 consecutive periods of the control signal and / or advantageously over a period of at least 0.5 s, in particular of at least 1 s and advantageously switches off at least 2 s. This can be achieved in particular a high efficiency.
  • Fig. 1 shows a cooking appliance 22, which is designed as an induction hob, with a cooking appliance device 10, which is designed as an induction hob device.
  • the cooking device device 10 comprises a base body 24 for setting up cooking utensils.
  • the cooking device device 10 comprises a plurality of heating elements 26, 28, 30, 32, 34.
  • the cooking appliance device 10 comprises five heating elements 26, 28, 30, 32, 34.
  • the cooking appliance device could comprise a plurality of heating elements, which could in particular form a cooktop matrix.
  • Each heating element 26, 28, 30, 32, 34 is designed as an induction heating element.
  • the heating elements 26, 28, 30, 32, 34 are each provided to heat on the base body 24 above the heating elements 26, 28, 30, 32, 34 set up cooking utensils.
  • the heating elements 26, 28, 30, 32, 34 form a classic cooktop with separately arranged heating zones.
  • a first heating element 26 of the heating elements 26, 28, 30, 32, 34 and a second heating element 28 of the heating elements 26, 28, 30, 32, 34 are arranged substantially concentrically, the second heating element 28 surrounding the first heating element 26.
  • a center of gravity of the first heating element 26 and a center of gravity of the second heating element 28 are spaced apart by at most 20%, in particular by a maximum of 10%, preferably by at most 5% and particularly advantageously by a maximum of 1% of a maximum extent of the first heating element 26.
  • a third heating element 30 of the heating elements 26, 28, 30, 32, 34, a fourth heating element 32 of the heating elements 26, 28, 30, 32, 34 and a fifth heating element 34 of the heating elements 26, 28, 30, 32, 34 are each separate arranged and each form their own heating zones. In the following, only the first heating element 26 and the second heating element 28 will be described.
  • the cooking device device 10 comprises an operating unit 36 for input and / or selection of operating parameters, for example a heating power and / or a heating power density and / or a heating zone and / or a cooking program.
  • the operating unit 36 is provided for outputting a value of an operating parameter to an operator.
  • the cooking device device 10 comprises a control unit 16, which is provided to execute actions and / or to change settings in dependence on operating parameters entered by means of the operating unit 26.
  • the cooking appliance device 10 comprises two inverters 12, 14 (cf. Fig. 2 ).
  • the cooking appliance device could include an inverter for each of the heating elements.
  • Each inverter 12, 14 has two switches 20.
  • the switches 20 of each of the inverters 12, 14 are connected in series and designed in particular as bidirectional unipolar switches 20.
  • Each switch 20 has a transistor and a diode connected in parallel.
  • the cooking appliance apparatus 10 includes, for each of the switches 20, a snubber capacitor 18 connected in parallel with the corresponding switch 20 of an inverter 12, 14.
  • Each snubber capacitor 18 has a capacitance value of 100 pF.
  • a voltage tap of each of the inverters 12, 14 is arranged in particular at a common contact point of the two switches 20 of the corresponding inverter 12, 14.
  • the inverters 12, 14 are each arranged in a half-bridge circuit. Each inverter 12, 14 is connected to a network connection 38 of a household network. For example, the inverters could be connected to different network connections of the household network. In the present embodiment, the inverters 12, 14 are connected to the same network connection 38.
  • the control unit 16 operates the inverters 12, 14 independently of each other. For example, the control unit could only operate one of the inverters, wherein the control unit in particular operates one of the inverters and deactivates another of the inverters. It is also possible that the control unit advantageously operates the inverters simultaneously at the same time.
  • the operator wants to heat cooking utensils (not shown) of large diameter.
  • the operator wants to achieve a large heating zone 40 formed by a plurality of heating elements 26, 28, in particular for heating a large-diameter cooking utensil.
  • the large heating zone 40 is formed by the first heating element 26 and the second heating element 28.
  • the target power P s for the heating zone 40 is predetermined by an operator.
  • the operator enters by a user input by means of the control unit 36, a common target power P s for the heating zone 40 a.
  • the control unit 16 in an operating state operates the inverters 12, 14 in common. After inputting the target power P s for the heating zone 40 by the operator, the control unit 16 determines a frequency f 1 , f 2 in the operating state for each of the inverters 12, 14
  • the control unit 16 operates a first inverter 12 of the inverters 12, 14 continuously at a first frequency f 1 and a second inverter 14 of the inverters 12, 14 continuously with a second when heating a heating configuration Frequency f 2 .
  • the control unit 16 adjusts an average output power P 1 , P 2 of the inverters 12, 14 to a predetermined setpoint power P s .
  • the control unit 16 assigns to the first inverter 12 a first setpoint power P s1 and the second inverter 14 a second setpoint power P s2 , which in particular form a respective predetermined setpoint power of a respective one of the inverters 12, 14.
  • the control unit 16 selects the first setpoint power P s1 and the second setpoint power P s2 according to the condition that a sum of the first setpoint power P s1 and the second setpoint power P s2 corresponds to the predetermined setpoint power P s .
  • the control unit 16 avoids the occurrence of intermodulation hums when adjusting the average output powers P 1 , P 2 of the inverters 12, 14. In addition, the control unit 16 avoids the occurrence of flicker in the adaptation of the average output power P 1 , P 2 of the inverters 12, 14. Despite these criteria, the control unit 16 in the operating state holds a respective output power P 1 , P 2 of the inverters 12, 14 substantially constant, in particular within a range of possible tolerances. Thus, in the operating state, the control unit 16 keeps a total output power P ges of the inverters 12, 14 substantially constant. This situation is in Fig. 3 schematically shown, wherein Fig. 3 shows a plot of the output power P on the ordinate axis and time t on the abscissa axis.
  • the control unit 16 selects the first frequency f 1 and the second frequency f 2 according to the condition that an amount of a difference of an integer multiple n of the first frequency f 1 and an integer multiple m of the second frequency f 2 either assumes a value of at least 17 kHz or substantially zero.
  • N a value of 10 has been assumed for N.
  • the value of N indicates the number of harmonics of the frequencies f 1 , f 2 taken into account in the adaptation of the average output powers P 1 , P 2 of the inverters 12, 14.
  • the control unit 16 has a memory unit in which the value of N is stored.
  • the value of N is chosen to be as large as possible, in particular taking into account economic criteria, in order in particular to achieve the best possible avoidance of intermodulation drones and flicker and to lower these advantageously below a legal standard.
  • the economic criteria include programming effort, computing power, material costs and production costs.
  • multiple values of N could be stored in the memory unit of the controller, and an operator in the operating state could select which value to use by the controller.
  • the operator himself could decide to what extent the operator wishes to avoid intermodulation hum and flicker. For example, older people might choose lower values of N, as these people typically perceive a smaller audible frequency range than younger people.
  • Fig. 4 shows the above-mentioned formula, wherein the first frequency f 1 on the ordinate axis and the second frequency f 2 are plotted on the abscissa axis and a value of N equal to 10 was assumed.
  • the control unit 16 takes into account, in addition to the above-mentioned conditions, the predetermined desired powers P s1 , P s2 as well as an impedance of a cooking utensil to be heated.
  • the control unit 16 selects in the operating state frequencies f 1 , f 2 with a value of at least 17 kHz.
  • the control unit 16 takes into account in the operating state frequencies f 1 , f 2 up to and including 100 kHz.
  • the control unit 16 selects a value of 60 kHz. Subsequently, the control unit 16 in the operating state selects a value of the second frequency f 2 based on the condition that an amount of a difference of an integer multiple n of the first frequency f 1 and an integer multiple m of the second frequency f 2 is either a value of at least 17 kHz or essentially assumes the value zero. Accordingly, values of 20 kHz, 30 kHz, 40 kHz, 60 kHz or 80 kHz are suitable for the second frequency f 2 (cf. Fig. 4 ). For example, in the operating state for the second frequency f 2 , the control unit 16 selects a value of 40 kHz. The first frequency f 1 and the second frequency f 2 thus each assume a value of at least 17 kHz.
  • the first frequency f 1 and the second frequency f 2 assume, for example, a ratio of three to two in the operating state (cf. Fig. 4 ). Thus, the first frequency f 1 and the second frequency f 2 are different. In this way, it is possible in particular to avoid influencing the output powers P 1 , P 2 by mutual coupling of the heating elements 26, 28.
  • the integer multiple n of the first frequency f 1 assumes a value of three.
  • the integer multiple m of the second frequency f 2 assumes a value of two.
  • the integer multiples n, m each take at least the value of two.
  • the control unit 16 For adjusting the average output powers P 1 , P 2 of the inverters 12, 14, the control unit 16 uses duty cycles of control signals of the inverters 12, 14 in the operating mode at given fixed frequencies f 1 , f 2. In the operating state, the control unit 16 uses duty cycles in a range greater than zero and less than one, which, due to the symmetry of the duty cycles, in particular corresponds to duty cycles in a range greater than zero and less than or equal to 0.5. The control unit 16 adapts the respective average output powers P 1 , P 2 of the inverters 12, 14 to the respective predetermined desired powers P s1 , P s2 in the operating state by changing the duty cycles.
  • the control unit 16 changes the respective duty cycle for adaptation of the respective average output powers P 1 , P 2 of the inverters 12, 14 after a duration of 10 ms by a maximum of 0.5% of a value of the corresponding duty cycle.
  • a conservation of the electronics can be achieved.
  • occurrence of flicker can be avoided.
  • the control unit 16 can precisely adjust the respective average output powers P 1 , P 2 of the inverters 12, 14 to the respective predetermined desired powers P s1 , P S2 .
  • the method described so far can be generalized to any number K of inverters 12, 14. Any number K of inverters 12, 14 could be given, for example, in a cooktop matrix.
  • the control unit 16 selects, in the operating state for any pair of inverters 12, 14 of the number K of inverters 12, 14, a further first frequency f 1 and a further second frequency f j according to the condition that an amount of a difference of an integer multiple n i of the first frequency f i and an integer multiple m j of the second frequency f j either assumes a value of at least 17 kHz or substantially zero. This applies to all values of the integer multiples n i , m j from the range of positive integers greater than or equal to 1 up to and including N K.
  • control unit 16 selects a value of 60 kHz in the operating state for the further first frequency f i . Subsequently, the control unit 16 selects in the operating state a value of the further second frequency f j on the basis of the stated condition. Accordingly, values of 20 kHz, 30 kHz, 40 kHz, 60 kHz or 80 kHz are suitable for the further second frequency f j (cf. Fig. 4 ). For example, the control unit 16 selects a value of 60 kHz in the operating state for the further second frequency f j .
  • the control unit 16 selects a value of 40 kHz, for example in the operating state for the further second frequency f j .
  • the control unit 16 selects a further frequency f i , f j for each pair of inverters 12, 14.
  • control unit 16 could perform another mode of operation.
  • the control unit 16 operates one of the inverters 12, 14 continuously with a fixed frequency f 3 , f 4 .
  • the control unit 16 continuously operates the first inverter 12 with a third frequency f 3 .
  • the control unit 16 operates the second inverter 14 discontinuously.
  • the control unit 16 switches off the second inverter 14 temporarily in the further operating state and operates the second inverter 14 temporarily with a fourth frequency f 4 .
  • a ratio of a period in which the second inverter 14 is turned off to a period takes in particular a value greater than zero and less than one.
  • a ratio of a period in which the second inverter 14 is operated in particular assumes a value greater than 0 and less than 1.
  • the control unit 16 selects, to avoid intermodulation hum, the third frequency f 3 and the fourth frequency f 4, under the condition that an amount of a difference of an integer multiple x of the third frequency f 3 and an integer multiple y of the fourth frequency f 4 is either one Value of at least 17 kHz or substantially zero.
  • the control unit 16 in the further operating state at given fixed frequencies f 3 , f 4 duty cycles of the inverters 12, 14.
  • control unit 16 in the further operating state duty cycles in a range greater than or equal to 0.2 and less than or equal to 0.8, which, due to the symmetry of the duty cycles, in particular corresponds to duty cycles in a range greater than or equal to 0.2 and less than or equal to 0.5.
  • the second inverter 14 in the period in which the second inverter 14 is operated an output power P 4 greater than a predetermined target power P s4 and in the period in which the second inverter 14 is deactivated, an output power P 4 smaller than a predetermined target power P s4 on.
  • An output power P 4 of the second, averaged over both time durations Inverter 14 is adapted in the further operating state to the predetermined target power P s4 .

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  • Induction Heating Cooking Devices (AREA)

Claims (9)

  1. Dispositif d'appareil de cuisson avec au moins deux onduleurs (12, 14) et avec une unité de commande (16), prévue, lors d'un chauffage d'au moins une configuration de chauffe dans au moins un état de fonctionnement, afin d'exploiter un premier onduleur (12) des au moins deux onduleurs (12, 14) en continu selon une première fréquence (f1) et un deuxième onduleur (14) des au moins deux onduleurs (12, 14) en continu selon une deuxième fréquence (f2) et d'adapter une puissance de sortie moyenne des au moins deux onduleurs (12, 14) à une puissance de consigne déterminée au préalable, et prévue, pour éviter un bourdonnement d'intermodulation, afin de sélectionner la première fréquence (f1) et la deuxième fréquence (f2) à la condition qu'une différence entre un multiple entier (n) de la première fréquence (f1) et un multiple entier (m) de la deuxième fréquence (f2) correspond soit à une valeur minimale de 14 kHz ou au moins essentiellement à la valeur nulle, dans lequel cette condition vaut pour l'ensemble des valeurs des multiples entiers n, m issues des nombres entiers positifs supérieurs ou égaux à 1 jusque N y compris.
  2. Dispositif d'appareil de cuisson 1, caractérisé en ce que l'unité de commande (16) est prévue afin d'utiliser, dans l'au moins un état de fonctionnement pour une adaptation des puissances de sortie moyennes des au moins deux onduleurs (12, 14), en présence de fréquences fixes données (f1, f2), des rapports cycliques de signaux de commande des au moins deux onduleurs (12, 14).
  3. Dispositif d'appareil de cuisson selon la revendication 2, caractérisé en ce que l'unité de commande (16) est prévue afin d'utiliser, dans l'au moins un état de fonctionnement, un rapport cyclique dans une plage supérieure à zéro et inférieure à un.
  4. Dispositif d'appareil de cuisson selon l'une des revendications précédentes, caractérisé en ce que la première fréquence (f1) et la deuxième fréquence (f2) adoptent respectivement une valeur minimale de 14 kHz.
  5. Dispositif d'appareil de cuisson selon l'une des revendications précédentes, caractérisé en ce que la première fréquence (f1) et la deuxième fréquence (f2) sont au moins essentiellement différentes.
  6. Dispositif d'appareil de cuisson selon l'une des revendications précédentes, caractérisé par au moins un condensateur d'affaiblissement (18) branché parallèlement à l'au moins un commutateur (20) de l'un des au moins deux onduleurs (12, 14) et qui présente une valeur capacitaire maximale de 1 nF.
  7. Dispositif d'appareil de cuisson selon l'une des revendications précédentes, caractérisé en ce que l'unité de commande (16) est prévue, dans au moins un état de fonctionnement supplémentaire, afin d'exploiter de manière discontinue au moins un onduleur (14) des au moins deux onduleurs (12, 14).
  8. Appareil de cuisson avec au moins un dispositif d'appareil de cuisson (10) selon l'une des revendications précédentes.
  9. Procédé d'exploitation d'un dispositif d'appareil de cuisson (10) avec au moins deux onduleurs (12, 14), en particulier selon l'une des revendications 1 à 7, dans lequel lors d'un chauffage d'au moins une configuration de chauffe dans au moins un état de fonctionnement, un premier onduleur (12) des au moins deux onduleurs (12, 14) est exploité en continu selon une première fréquence (f1) et un deuxième onduleur (14) des au moins deux onduleurs (12, 14) est exploité en continu selon une deuxième fréquence (f2), une puissance de sortie moyenne des au moins deux onduleurs (12, 14) est adaptée à une puissance de consigne déterminée au préalable, et, pour éviter un bourdonnement d'intermodulation, la première fréquence (f1) et la deuxième fréquence (f2) sont sélectionnées à la condition qu'une différence entre un multiple entier (n) de la première fréquence (f1) et un multiple entier (m) de la deuxième fréquence (f2) corresponde soit à une valeur minimale de 14 kHz ou au moins essentiellement à la valeur nulle, dans lequel cette condition vaut pour l'ensemble des valeurs des multiples entiers n, m issues des nombres entiers positifs supérieurs ou égaux à 1 jusque N y compris.
EP15159602.0A 2014-03-24 2015-03-18 Dispositif d'appareil de cuisson Active EP2945461B1 (fr)

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ES2720746A1 (es) * 2018-01-08 2019-07-24 Bsh Electrodomesticos Espana Sa Dispositivo de campo de coccion

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ES2201937B1 (es) 2003-11-03 2005-02-01 Bsh Electrodomesticos España, S.A. Procedimiento para el funcionamiento de un circuito convertidor.
EP2469971B1 (fr) * 2010-12-27 2016-11-16 BSH Hausgeräte GmbH Dispositif d'appareil de cuisson
EP2506664B1 (fr) * 2011-03-28 2016-02-24 BSH Hausgeräte GmbH Dispositif d'appareil de cuisson

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