EP4159003A1 - Appareil électroménager - Google Patents

Appareil électroménager

Info

Publication number
EP4159003A1
EP4159003A1 EP21726660.0A EP21726660A EP4159003A1 EP 4159003 A1 EP4159003 A1 EP 4159003A1 EP 21726660 A EP21726660 A EP 21726660A EP 4159003 A1 EP4159003 A1 EP 4159003A1
Authority
EP
European Patent Office
Prior art keywords
modulation
household appliance
appliance device
period
control unit
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.)
Pending
Application number
EP21726660.0A
Other languages
German (de)
English (en)
Inventor
Alberto Dominguez Vicente
Jorge ESPAÑOL LEZA
Guillermo Lazaro Amatriain
Antonio Muñoz Fumanal
Ramon Peinado Adiego
Jorge Tesa Betes
Jorge VILLA LOPEZ
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 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.)
Filing date
Publication date
Application filed by BSH Hausgeraete GmbH filed Critical BSH Hausgeraete GmbH
Publication of EP4159003A1 publication Critical patent/EP4159003A1/fr
Pending legal-status Critical Current

Links

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
    • 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
    • H05B6/04—Sources of current
    • 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
    • H05B2213/00—Aspects relating both to resistive heating and to induction heating, covered by H05B3/00 and H05B6/00
    • H05B2213/03—Heating plates made out of a matrix of heating elements that can define heating areas adapted to cookware randomly placed on the heating plate

Definitions

  • the invention relates to a household appliance device according to the preamble of claim 1 and a method for operating a household appliance device according to the preamble of claim 12.
  • a household appliance device with a control unit is already known from the prior art, which is provided to control an induction target repetitively with a switching frequency and to supply it with energy.
  • the control unit modulates the switching frequency in an operating state within a modulation period, which corresponds to a maximum of half a period of an AC mains voltage, by means of frequency modulation. Due to the very short duration of the modulation period, performing the frequency modulation is associated with a high computational effort, which necessitates the use of high-performance, application-specific integrated circuits and is therefore associated with increased costs.
  • the object of the invention is in particular, but not limited to, to provide a generic device with improved properties with regard to efficiency.
  • the object is achieved according to the invention by the features of claims 1 and 12, while advantageous refinements and developments of the invention can be found in the subclaims.
  • the invention is based on a household appliance device, in particular a cooking appliance device, with at least one control unit which is provided to control at least one induction target repetitively with a switching frequency and to provide it with energy.
  • the control unit modulates the switching frequency within a modulation period, which corresponds to an integer multiple of half a period of an AC mains voltage, by means of at least one frequency modulation.
  • a modulation period which corresponds to an integer multiple of half a period of an AC mains voltage.
  • a spectral power density of the switching frequency can preferably be reduced by means of the frequency modulation.
  • flicker according to a flicker standard in particular according to DIN EN 61000-3-3 standard and / or IEC standard 1000-3-3, in particular by advantageous control of individual or multiple induction targets, at least largely, in particular in Essentially, completely, to be avoided.
  • an unfavorable acoustic stress on an operator can be avoided, whereby in particular a high level of operating comfort and, in particular, a positive operating impression for the operator, in particular with regard to acoustic quality, can be achieved.
  • the requirements for an EMC filter can be reduced before geous, whereby material costs can be reduced.
  • the modulation period is increased compared to the prior art and corresponds to an integer multiple of half the period duration of the AC mains voltage, a temporary computing effort for performing the frequency modulation can also advantageously be reduced.
  • an application-specific integrated circuit ASIC chip
  • users can in turn advantageously be provided with particularly inexpensive household appliance devices with the aforementioned advantageous properties with regard to security and / or convenience.
  • a “household appliance device”, in particular a “cooking appliance device”, advantageously a “hob device” and particularly advantageously an “induction hob device” is intended to mean at least one part, in particular a sub-assembly, of a household appliance, in particular a cooking appliance, advantageously a hob and especially advantageously an induction hob.
  • a household appliance having the household appliance device is advantageously a cooking device.
  • a household appliance designed as a cooking appliance could, for example, be an oven and / or a microwave and / or a grill appliance and / or a steam cooker.
  • a domestic appliance designed as a cooking appliance is preferably a hob and particularly preferably an induction hob.
  • control unit should be understood to mean an electronic unit which is at least partially integrated in the household appliance device and which is provided to control at least one induction target repetitively with a switching frequency and to supply it with energy.
  • the control unit preferably has at least one inverter unit, which can in particular be designed as a resonance inverter and / or as a dual half-bridge inverter.
  • the inverter unit preferably comprises at least two switching elements which can be controlled individually by the control unit.
  • a “switching element” should be understood to mean an element which is provided to establish and / or separate an electrically conductive connection between two points, in particular contacts of the switching element.
  • the switching element preferably has at least one control contact via which it can be switched.
  • the switching element is preferably designed as a semiconductor switching element, in particular as a transistor, for example as a metal-oxide-semiconductor field effect transistor (MOSFET) or organic field effect transistor (OFET), advantageously as a bipolar transistor with a preferably insulated gate electrode (IGBT).
  • MOSFET metal-oxide-semiconductor field effect transistor
  • OFET organic field effect transistor
  • IGBT insulated gate electrode
  • the switching element is designed as a mechanical and / or electromechanical switching element, in particular as a relay.
  • the control unit preferably comprises a computing unit and, in particular, in addition to the computing unit, a memory unit with at least one control program stored therein which is provided to be executed by the computing unit.
  • An “induction target” should be an inductor or a plurality of inductors, which is / are part of the household appliance device and which / which can be controlled jointly by the control unit, with at least one, above the inductor and / or the plurality of Inductors erected receiving element, which in particular can be part of an external unit, can be understood.
  • An “inductor” is to be understood here as an element which has at least one induction coil and which is provided to supply energy, in particular in the form of an alternating magnetic field, to the at least one receiving element in the operating state.
  • an induction target can be provided to supply the receiving element with energy for the purpose of heating.
  • the receiving element could be designed, for example, as a cookware and at least one Secondary coil as a receiving element for receiving the energy provided by the inductor.
  • the receiving element could also be designed as a metallic heating means, in particular as an at least partially ferromagnetic heating means, for example as a ferromagnetic base of cooking utensils, in which eddy currents and / or magnetic reversal effects are caused by the inductor in the operating state, which at least can be partially converted into heat.
  • the plurality of inductors can be arranged in a matrix-like manner, the inductors arranged in a matrix-like manner being able to form a variable cooking surface.
  • At least one inverter unit is preferably assigned to each of the induction targets.
  • control unit In the operating state, the control unit preferably modulates the switching frequency continuously within an operating period which corresponds to at least one modulation period, preferably a plurality of successive modulation periods.
  • the operating period of the induction target corresponds to an entire operating time of the household appliance device, that is to say a period in which the household appliance appliance is operated continuously. It is also conceivable that the control unit operates several induction targets and / or several inductors of the induction target alternately, in a time-multiplex mode. In the time-division multiplex mode, the operating period corresponds to the period of time within which the control unit controls a specific induction target or a plurality of specific induction targets simultaneously with the switching frequency and supplies it with energy.
  • the control unit preferably controls at least one inductor of the induction target to generate an alternating magnetic field and to supply electrical energy with an alternating electrical current, the switching frequency of which is preferably in a range from 20 kHz to 150 kHz and particularly preferably in a range of 30 kHz to 75 kHz.
  • a “modulation period” is to be understood as a time period in which the control unit modulates the switching frequency using the at least one frequency modulation.
  • the modulation period corresponds to an integer multiple of half a period of an alternating mains voltage, the period of the alternating mains voltage corresponding to the reciprocal of the mains frequency.
  • AC mains voltage is typically provided at a mains frequency of 50 Hz, so that half a period of the AC mains voltage is 10 ms in this case.
  • the control unit is provided to adapt the duration of the modulation period to the correspondingly changed period duration of the mains alternating voltage and as a corresponding integer multiple of half of the changed period.
  • a “frequency modulation” is to be understood as a modulation method on the basis of which the control unit varies the switching frequency.
  • the frequency modulation preferably comprises at least one method which is known under the term “frequency spreading” or under the English terms “spread spectrum” or “spread spectrum blocking”.
  • the frequency modulation is provided to reduce, preferably to minimize, interfering influences which can be caused, for example, by individual peaks of the switching frequency in an operating state of the household appliance device. Interfering influences can be perceptible and perceived as undesirable influences by a user and / or influences prohibited by legal regulations. For example, interfering influences could be designed as flicker.
  • interference could be unwanted acoustic influences, in particular in a frequency range between 20 Hz and 20 kHz that is perceptible to an average human ear.
  • Disturbing influences could be caused in particular by intermodulation and express themselves in audible perceptible background noises.
  • Intermodulation should be understood to mean the sum and / or difference products of individual alternating current frequencies or their nth harmonics, where n stands for an integer greater than zero.
  • Interference can also, alternatively or additionally, be caused by the occurrence of a ripple current, i.e. an alternating current of any frequency and curve shape, which is superimposed on a direct current and manifests itself in an undesirable humming tone.
  • interference does not include any technical malfunctions, defects and / or other undesirable phenomena, such as, for example, an uneven distribution of heat.
  • the modulation period comprises at least two, in particular different from one another, modulation intervals which correspond to an integral multiple of half a period of an AC mains voltage. In this way, particularly precise frequency modulation can advantageously be achieved.
  • the modulation period preferably comprises a multiplicity of modulation intervals, in particular differing from one another, which each correspond to an integral multiple of half a period of an AC mains voltage.
  • the at least two modulation intervals correspond to different multiples of half the period duration of the mains alternating voltage.
  • a first modulation interval could correspond to twice and a further modulation interval to four times the period duration of the AC mains voltage.
  • All modulation intervals within a modulation period preferably correspond to the same multiple, particularly preferably twice, half of the period duration of the AC mains voltage.
  • the modulation intervals can differ from one another, for example, with regard to an amount and / or with regard to a sign of a variation in the switching frequency.
  • control unit could vary the switching frequency by a certain first amount in the first modulation interval and the switching frequency by a further amount in a further modulation interval, which is, for example, greater or less than the first amount and / or a sign opposite to the first amount has, vary.
  • the control unit modulates the switching frequency in the operating state using at least one predefined modulation profile.
  • the predefined modulation profile can be understood as a fundamental time course of the frequency modulation within a modulation period, which is in particular stored in the memory unit of the control unit.
  • the predefined modulation profile could, for example, define a frequency value range of the switching frequency in which the control unit modulates the switching frequency within the modulation period.
  • the predefined modulation profile could include a maximum and / or a minimum switching frequency which the control unit cannot exceed or fall below.
  • the modulation profile could for example contain a maximum and / or minimum percentage variation of an output switching frequency.
  • the modulation profile in particular experimentally determined, concrete switching frequency values, in particular concrete switching frequency values of individual, in particular all, modulation intervals, of the modulation period.
  • a plurality of different predefined modulation profiles are preferably stored in the memory unit of the control unit, which can be automatically called up by the control unit, in particular based on a selection made by a user of a specific operating mode and / or a setpoint power provided via the induction target.
  • control unit modulates the switching frequency “using at least one predefined modulation profile” is to be understood as meaning that the control unit at least takes into account the predefined modulation profile for the frequency modulation.
  • the predefined modulation profile can be provided as a template for the frequency modulation to be carried out by the control unit, the control unit changing the frequency modulation based on the predefined modulation profile and in particular to an individual operating situation, for example to a certain operating mode and / or to a number simultaneously to be operated induction targets and / or to a desired output selected by a user or the like.
  • the modulation profile could, for example, be a rectangular or sawtooth-shaped profile and have points of discontinuity with larger jumps in the switching frequency.
  • the modulation profile can be described by an essentially continuous mathematical function. In this way, the occurrence of flicker can advantageously be reduced, preferably minimized. Since a change in switching frequencies in electrical components is discrete and therefore cannot take place in infinitesimally small steps, as would be required according to a strict mathematical definition of continuity, the at least essentially constant modulation profile in this context should be used as part of a resolution of the switching frequency, i.e. a minimum level of change between two immediately successive switching frequencies, can be regarded as continuous.
  • the minimum step between two immediately successive switching frequencies of the modulation profile is preferably at least 1 Hz, advantageously at least 2 Hz, particularly advantageously at least 4 Hz, and a maximum of 8 Hz. It is also proposed that the modulation profile have a linear course at least in sections within the modulation period. A modulation profile that is linear at least in sections can advantageously reduce, preferably minimize, interference influences during operation of the household appliance device, such as acoustic noise or the like, in a particularly reliable manner.
  • An “at least partially linear course” is to be understood here as meaning that the modulation profile has at least one section from a plurality of at least three successive modulation intervals in which the switching frequency is changed by the control unit by the same amount.
  • the modulation period could have a section which consists of at least three successive modulation intervals in which the control unit increases the switching frequency by an amount of 1 Hz each.
  • the modulation profile can have a plurality of sections, each of which has a linear profile, wherein the linear sections could have mutually different slopes.
  • the control unit could increase the switching frequency in a first linear section of the modulation profile from at least three consecutive modulation intervals in each of the modulation intervals by 1 Hz and in a subsequent second linear section of the modulation profile from at least three further successive modulation intervals by 2 each Increase Hz.
  • the modulation profile have an exponential curve at least in sections within the modulation period.
  • a modulation profile that is exponential at least in sections can advantageously reduce, preferably minimize, interference influences during operation of the household appliance device, such as acoustic noise or the like, in a particularly efficient manner.
  • An "at least partially exponential curve" is to be understood here as meaning that the modulation profile has a plurality of at least three successive modulation intervals in which the switching frequency is changed by the control unit by an amount that can be written by an exponential function.
  • the modulation period could have a section which consists of at least three successive modulation intervals, in which the control unit sets the switching frequency in the first of the successive modulation intervals by 2 Hz and in the second of the successive modulation intervals increases by 4 Hz and in the third of the successive modulation intervals by 8 Hz.
  • the modulation profile be mirror-symmetrical at least in sections within the modulation period.
  • the occurrence of disruptive effects, in particular flicker can advantageously be further reduced.
  • a desired target power of the induction target can advantageously be set particularly precisely.
  • the at least partially mirror-symmetrical modulation profile could, for example, have a first section in which the switching frequency has a curve, for example linear or exponential, which can be described by a first mathematical function, and a second section immediately following the first section, which is characterized by a second mathematical function can be described, which can be represented by reflection on an axis of symmetry.
  • control unit is provided to vary the modulation profile on the basis of at least one parameter relating to the induction target.
  • the frequency modulation can advantageously be adapted to an individual operating situation.
  • control unit has at least one sensor unit for detecting the parameter relating to the induction target.
  • the parameter relating to the induction target could include, for example, a temperature of the induction target and / or a close range of the induction target and / or an operating time of the induction target or the like.
  • the parameter relating to the induction target is preferably an electrical parameter of the induction target and / or at least one component connected to the induction target in at least one electrical circuit.
  • the electrical parameter relating to the induction target could for example be an inductance and / or an electrical resistance and / or an impedance and / or a capacitance and / or electrical voltage and / or current strength and / or an electrical power and / or a resonance frequency or the like include.
  • the parameter have at least one electrical conductance of the inductive onsziels includes.
  • a desired target power of the induction target can advantageously be set particularly precisely.
  • the control unit preferably varies the modulation profile in such a way that the electrical conductance of the induction target is constant averaged over the modulation period.
  • the electrical conductance of the induction target can be a real conductance and / or a complex conductance of the induction target.
  • control unit in the operating state additionally modulates the switching frequency within an intermediate modulation period, which corresponds to a maximum of half the period of the AC mains voltage, by means of at least one further frequency modulation.
  • the control unit in the operating state additionally modulates the switching frequency within an intermediate modulation period, which corresponds to a maximum of half the period of the AC mains voltage, by means of at least one further frequency modulation.
  • the invention is also based on a method for operating a household appliance device, in particular a cooking appliance device, with at least one induction target that can be controlled with a switching frequency.
  • the switching frequency be modulated by means of at least one frequency modulation within a modulation period, which corresponds to an integer multiple of half a period duration of a mains alternating voltage.
  • the household appliance device should not be restricted to the application and embodiment described above.
  • the household appliance device can have a number of individual elements, components and units that differs from a number of individual elements, components and units mentioned herein in order to fulfill a mode of operation described herein.
  • Fig. 1 is a schematic representation of a household appliance with a household appliance device comprising an induction target and a control unit,
  • FIG. 2 shows a schematic electrical circuit diagram of the household appliance with the household appliance device
  • FIG. 3 shows a schematic diagram to illustrate a modulation period within which the control unit modulates a switching frequency
  • FIG. 5 shows a further exemplary embodiment of a modulation profile, on the basis of which a control unit of a household appliance device modulates a switching frequency, in a schematic diagram
  • FIG. 6 shows a further exemplary embodiment of a modulation profile, on the basis of which a control unit of a household appliance device modulates a switching frequency, in a schematic diagram
  • FIG 7 shows a further exemplary embodiment of a modulation profile, on the basis of which a control unit of a household appliance device modulates a switching frequency, in two schematic diagrams; and FIG Charts.
  • FIG. 1 shows a household appliance 40a with a household appliance device 10a.
  • the household appliance 40a is designed as an induction hob.
  • the household appliance device 10a has a control unit 12a and an induction target 14a.
  • the control unit 12a is provided to control the induction target 14a repetitively with a switching frequency 16a (cf. FIG. 3) and to supply it with energy.
  • Figure 2 shows a schematic electrical circuit diagram of the household appliance 40a.
  • the household appliance 40a is connected to a mains AC voltage source 34a.
  • the AC line voltage source 34a provides an AC line voltage 22a or an AC line current 36a with a period 46a.
  • the household appliance 40a has an EMC filter unit 38a, which is electrically connected to the AC voltage source 34a.
  • the household appliance device has a rectifier unit 42a, which is electrically connected to the AC power source 34a via the EMC filter unit 38a.
  • the rectifier unit 42a is provided to wan the AC line voltage 22a into a periodically pulsating DC voltage 44a, the period of which corresponds to half a period 20a of the AC line voltage 22a.
  • the control unit 12a is provided to control the induction target 14a repetitively with a switching frequency 16a and to supply it with energy.
  • the control unit 12a comprises an inverter unit 48a.
  • the inverter unit 48a is electrically connected to the rectifier unit 42a of the household appliance 40a.
  • the inverter unit 48a of the control unit 12a converts the DC voltage 44a provided by the rectifier unit 12a of the household appliance 40a into a supply voltage 50a with the switching frequency 16a within a plurality of successive switching processes, each of which lasts a switching period 52a around.
  • the control unit 12a supplies the induction target 14a with electrical energy in the form of a supply current 54a.
  • FIG. 3 shows a diagram for a schematic representation of a modulation period 18a.
  • a time is plotted on an abscissa 56a of the diagram.
  • the switching frequency 16a and the supply current 54a are applied to an ordinate 58a.
  • the control unit 12a modulates the switching frequency 16a within a modulation period 18a by means of a frequency modulation.
  • the modulation period 18a corresponds to an integral multiple of half the period duration 20a of the AC mains voltage 22a.
  • the switching frequency 16a corresponds to an average switching frequency 60a.
  • FIG. 4 shows a diagram to illustrate a modulation profile 28a within the modulation period 18a.
  • a time is plotted on an abscissa 62a of the diagram.
  • the switching frequency 16a is plotted on an ordinate 64a.
  • the modulation period 18a comprises a multiplicity of successive modulation intervals 24a, 26a, each of which corresponds to an integral multiple of half the period duration 20a of the AC mains voltage 22a.
  • the switching frequency 16a increases within the modulation interval 24a.
  • the switching frequency 16a falls within the modulation interval 26a.
  • the control unit 12a modulates the switching frequency 16a on the basis of the predefined modulation profile 28a.
  • the modulation profile 28a can be described by an essentially continuous mathematical function.
  • the modulation profile 28a has an at least partially linear course within the modulation period 18a.
  • the modulation profile 28a has a linear and essentially continuous course with a switching frequency 16a to be taken.
  • the modulation profile 28a has a linear and essentially steady course with a decreasing switching frequency 16a.
  • the modulation profile 28a is at least partially mirror-symmetrical.
  • the modulation profile 28a is mirror-symmetrical with respect to a symmetry axis 66a, so that the course of the modulation profile 28a in the first section 68a by reflection on the symmetry axis 66a results in the course of the modulation profile 28a in the second section 70a.
  • the switching frequency 16a within the modulation period 18a which corresponds to an integral multiple of half a period 20a of the AC mains voltage 22a, is modulated by means of the frequency modulation.
  • FIGS. Four further exemplary embodiments of the invention are shown in FIGS. The following descriptions are essentially limited to the differences between the exemplary embodiments. times and functions can be referred to the description of the embodiment of Figures 1 to 4.
  • the letter a in the reference numerals of the exemplary embodiment in FIGS. 1 to 4 is replaced by the letters b to e in the reference numerals of the exemplary embodiments in FIGS. 5 to 8.
  • FIG. 5 shows a diagram to show a modulation profile 28b which is used by a control unit 12b of a household appliance device 10b for frequency modulation of a switching frequency 16b.
  • a time is plotted on an abscissa 62b of the diagram.
  • a switching frequency 16b is plotted on an ordinate 64b of the diagram.
  • the household appliance device 10b differs from the household appliance device 10a of the previous exemplary embodiment essentially with regard to the modulation profile 28b used by the control unit 12b for the frequency modulation.
  • the control unit 12b modulates the switching frequency 16b using the modulation profile 28b by means of the frequency modulation within a modulation period 18b, which corresponds to an integral multiple of half a period 20b of an AC mains voltage 22b.
  • the modulation profile 28b can be described by an at least essentially continuous mathematical function.
  • the modulation profile 28b has an at least partially linear course within the modulation period 18b.
  • the modulation profile 28b has a linear and essentially steady course with an increasing switching frequency 16b.
  • the modulation profile 28b has a linear and essentially steady course with a flatter increase in the switching frequency 16b compared to the first subsection 72b.
  • the modulation profile 28b has a linear and essentially steady course with a flatter increase in the switching frequency 16b compared to the second subsection 74b.
  • the modulation profile 28b is at least partially mirror-symmetrical.
  • the modulation profile 28b is mirror-symmetrical with respect to an axis of symmetry 66b, so that the course of the modulation profile 28b in the first section 68b by reflection on the axis of symmetry 66b results in a course of the modulation profile 28b in a second section 70b.
  • FIG. 6 shows a diagram to show a modulation profile 28c which is used by a control unit 12c of a household appliance device 10c for a frequency modulation of a switching frequency 16c.
  • a time is plotted on an abscissa 62c of the diagram.
  • a switching frequency 16c is plotted on an ordinate 64c of the diagram.
  • the household appliance device 10c differs from the household appliance devices 10a and 10b of the previous exemplary embodiments essentially with regard to the modulation profile 28c used by the control unit 12c for the frequency modulation.
  • the control unit 12c modulates the switching frequency 16c using the modulation profile 28c by means of frequency modulation within a modulation period 18c, which corresponds to an integral multiple of half a period 20c of an AC mains voltage 22c.
  • the modulation profile 28c can be described by an at least essentially continuous mathematical function.
  • the modulation profile 28c has an exponential curve at least in sections within the modulation period 18c.
  • the modulation profile 28c has an essentially steady course with an exponentially increasing switching frequency 16b.
  • the modulation profile 28c has an essentially steady course with an exponentially decreasing switching frequency 16c.
  • the modulation profile 28c is at least partially mirror-symmetrical.
  • the modulation profile 28c is mirror-symmetrical with respect to an axis of symmetry 66c, so that the course of the modulation profile 28c in the first section 68c by mirroring on the axis of symmetry 66c results in a course of the modulation profile 28c in a second section 70c.
  • FIG. 7 shows two diagrams for the representation of a modulation profile 28d, which is used by a control unit 12d of a household appliance device 10d for a frequency modulation of a switching frequency 16d.
  • a time is plotted on an abscissa 62d of a lower diagram.
  • a switching frequency 16d is plotted on an ordinate 64d of the lower diagram.
  • a time is plotted on an abscissa 78d of an upper diagram.
  • a power 82d is plotted on an ordinate 80d of the upper diagram.
  • the household appliance device 10d differs from the household appliance device 10a-c of the preceding exemplary embodiments essentially with regard to the modulation profile 28d used by the control unit 12d for the frequency modulation.
  • the control unit 12d controls an induction target 14d of the household appliance device 10d with the switching frequency 16d and modulates it using the modulation profile 28d by means of the frequency modulation within a modulation period 18d, which is an integral multiple of half a period duration 20d of an AC mains voltage 22d is equivalent to.
  • the control unit 12d is provided to vary the modulation profile 28d on the basis of at least one parameter 30d relating to the induction target 14d.
  • the parameter 30d relating to the induction target 14d is a target power set by a user that is to be provided by the induction target 14d.
  • a general course of the modulation profile 28d is at least essentially continuous, linear in sections and can be viewed as an inverse of a general course of the modulation profile 28b (cf. FIG. 5).
  • the control unit 12d varies a frequency value range 84d of the modulation profile 28d in an operating state in such a way that the curve of the power 82d shown in the upper diagram results.
  • the power 82d changes and has a surplus 86d in sections and a deficit 88d in sections, so that the power 82d, viewed over the modulation period 18d, corresponds on average to the target power set by the user.
  • FIG. 8 shows two diagrams for the representation of a modulation profile 28e, which is used by a control unit 12e of a household appliance device 10e for a frequency modulation of a switching frequency 16e.
  • a modulation profile 28e which is used by a control unit 12e of a household appliance device 10e for a frequency modulation of a switching frequency 16e.
  • the switching frequency 16e is plotted on an ordinate 64e of the lower diagram.
  • a time is plotted on an abscissa 78e of an upper diagram.
  • An electrical conductance 90e is plotted on an ordinate 80e of the upper diagram.
  • the household appliance device 10e differs from the household appliance device 10d of the previous exemplary embodiment with regard to a parameter 30e relating to an induction target 14e, on which the control unit 12e bases a variation of the modulation profile 28e.
  • the parameter 30e comprises at least one electrical conductance of the induction target 14e.
  • the parameter 30e relating to the induction target 14e is a mean real conductance value of the induction target 14e.
  • the control unit 12e varies the modulation profile 28e in an operating state in such a way that the curve of the electrical conductance 90e shown in the upper diagram results.
  • the electrical conductance 90e changes and has an excess 86e in sections and a deficit 88e in sections.
  • the control unit 12d varies the modulation profile 28e in such a way that the electrical conductance 90e is constant on average over the modulation period 18e.
  • the control unit 12e controls an induction target 14e of the household appliance device 10e with the switching frequency 16e and modulates this using the modulation profile 28e by means of frequency modulation within a modulation period 18e, which corresponds to an integral multiple of half a period duration 20e of an AC mains voltage 22e.
  • the household appliance device 10e also differs from the household appliance device 10a-d in that the control unit 12e additionally modulates the switching frequency 16e in the operating state within an intermediate modulation period 32e, which corresponds to a maximum of half the period 20e of the AC mains voltage 22e, by means of at least one further frequency modulation.
  • the control unit 12e varies in an operating state, in addition to the frequency modulation described above on the basis of the modulation profile 28e, the switching frequency 16e within the intermediate modulation period 32e, namely within half the period 20e of the AC mains voltage 22e, based on the intermediate modulation profile 92e shown in FIG. 8, in order to prevent flicker from occurring.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Induction Heating Cooking Devices (AREA)

Abstract

L'invention concerne un appareil électroménager (10a-e), notamment un appareil de cuisson, comprenant au moins une unité de commande (12a-e) qui est conçue pour commander au moins une cible d'induction (14a-e) de manière répétée avec une fréquence de commutation (16a-e) et l'alimenter en énergie. Pour donner à un tel appareil un meilleur rendement, l'unité de commande (14a-e) module, dans un état de fonctionnement, au moyen d'une modulation de fréquence, la fréquence de commutation (16a-e) sur une période de modulation (18a-e) qui correspond à un multiple entier de la demi-période (20a-e) d'une tension alternative réseau (22a-e).
EP21726660.0A 2020-06-02 2021-05-20 Appareil électroménager Pending EP4159003A1 (fr)

Applications Claiming Priority (2)

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EP20382471 2020-06-02
PCT/EP2021/063457 WO2021244860A1 (fr) 2020-06-02 2021-05-20 Appareil électroménager

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EP4159003A1 true EP4159003A1 (fr) 2023-04-05

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US (1) US20230232504A1 (fr)
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Publication number Priority date Publication date Assignee Title
DE102022203733A1 (de) * 2022-04-13 2023-10-19 Siemens Aktiengesellschaft Verfahren zur Erzeugung von Ansteuersignalen für Leistungsschalter in einem resonanten DC/DC-Wandler

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2726704B1 (fr) * 1994-11-07 1997-01-31 Breda Jean Pierre Generateur haute frequence a resonance pour un appareil de chauffage a induction
FR2773014B1 (fr) * 1997-12-23 2000-03-03 Europ Equip Menager Dispositif d'alimentation de plusieurs circuits resonants par un generateur de puissance a onduleur
JP2010080359A (ja) * 2008-09-29 2010-04-08 Hitachi Appliances Inc 電磁誘導加熱装置
TWI394547B (zh) * 2009-03-18 2013-05-01 Delta Electronics Inc 加熱裝置
CN101848566B (zh) * 2009-03-23 2013-02-20 台达电子工业股份有限公司 加热装置
ES2673132B1 (es) * 2016-12-19 2019-03-28 Bsh Electrodomesticos Espana Sa Dispositivo de aparato de cocción por inducción.

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US20230232504A1 (en) 2023-07-20

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