WO2020178043A1 - Power supply circuit for a cooking device and cooking device - Google Patents

Power supply circuit for a cooking device and cooking device Download PDF

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Publication number
WO2020178043A1
WO2020178043A1 PCT/EP2020/054560 EP2020054560W WO2020178043A1 WO 2020178043 A1 WO2020178043 A1 WO 2020178043A1 EP 2020054560 W EP2020054560 W EP 2020054560W WO 2020178043 A1 WO2020178043 A1 WO 2020178043A1
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WO
WIPO (PCT)
Prior art keywords
signal
frequency
heating
power supply
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.)
Ceased
Application number
PCT/EP2020/054560
Other languages
French (fr)
Inventor
Massimo Zangoli
Massimo Nostro
Alex Viroli
Andrea Rossi
Enrico VALENTINI
Emanuel URGESE
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.)
Electrolux Appliances AB
Original Assignee
Electrolux Appliances AB
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 Electrolux Appliances AB filed Critical Electrolux Appliances AB
Priority to AU2020230845A priority Critical patent/AU2020230845B2/en
Priority to KR1020217028692A priority patent/KR102876672B1/en
Priority to CN202080018451.1A priority patent/CN113508640B/en
Priority to BR112021017490-7A priority patent/BR112021017490B1/en
Priority to US17/433,635 priority patent/US12232242B2/en
Publication of WO2020178043A1 publication Critical patent/WO2020178043A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/06—Control, e.g. of temperature, of power
    • H05B6/062—Control, e.g. of temperature, of power for cooking plates or the like
    • 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/12—Arrangements for reducing harmonics from AC input or output
    • H02M1/126—Arrangements for reducing harmonics from AC input or output using passive filters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
    • H02M7/02—Conversion of AC power input into DC power output without possibility of reversal
    • H02M7/04—Conversion of AC power input into DC power output without possibility of reversal by static converters
    • H02M7/12—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/21—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/217—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M7/219—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only in a bridge configuration
    • 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
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
    • H05B6/12—Cooking devices
    • H05B6/1209—Cooking devices induction cooking plates or the like and devices to be used in combination with them
    • H05B6/1245—Cooking devices induction cooking plates or the like and devices to be used in combination with them with special coil arrangements
    • H05B6/1272—Cooking devices induction cooking plates or the like and devices to be used in combination with them with special coil arrangements with more than one coil or coil segment per heating zone
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
    • H02M7/02—Conversion of AC power input into DC power output without possibility of reversal
    • H02M7/04—Conversion of AC power input into DC power output without possibility of reversal by static converters
    • H02M7/12—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/21—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/217—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • 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 power supply circuit for a cooking device, in particular for an induction cooking device, more par- ticularly for an induction hob, and to a corresponding cooking device .
  • Heating units for cooking devices in particular for induction cooking devices, can be powered and/or operated by means of heating frequency generating units which each convert an inter nal DC supply signal into a heating frequency signal.
  • heating frequency generating units can supply the heating units with a heating fre quency signal.
  • a heating frequency signal By means of a heating frequency signal, heating power can be generated in a heating unit.
  • the frequencies of the heating frequency signals can be varied differently for dif ferent heating units.
  • the object is solved in particular by the power supply circuit according to claim 1 and by a cooking device according to claim
  • the invention relates to a power supply circuit for a cooking device, in particular for an induction cooking device, more par ticularly for an induction hob,
  • the power supply circuit is comprising
  • a in particular a single, frequency adapting unit, in partic- ular filtering unit, for adapting at least one external supply signal into a single or at least one internal AC supply signal,
  • heating frequency generating units each for converting one or at least one DC supply signal supplied by at least one DC signal generating unit into a heat ing frequency signal for supplying at least one heating unit with electrical power.
  • the invention relates in particular to a power supply circuit for an induction hob, wherein the power supply circuit is com prising a single frequency adapting unit, in particular filter ing unit, for adapting a or one external AC supply signal into one internal AC supply signal, and two DC signal generating units, each for converting the internal AC supply signal into two signal components of an internal DC supply signal and three, in particular at least three, four or at least four heating fre quency generating units, each for converting a or one DC supply signal supplied by a or one DC signal generating unit into a heating frequency signal for supplying at least one heating unit with electrical power.
  • the power supply circuit is com prising a single frequency adapting unit, in particular filter ing unit, for adapting a or one external AC supply signal into one internal AC supply signal, and two DC signal generating units, each for converting the internal AC supply signal into two signal components of an internal DC supply signal and three, in particular at least three, four or at least four heating fre quency generating units, each for converting a or
  • the invention relates in particular to a power supply circuit for an induction hob, wherein the power supply circuit is com prising a single frequency adapting unit, in particular filter ing unit, for adapting a or one AC external supply signal into one internal AC supply signal, and two DC signal generating units, each for converting the internal AC supply signal into one signal component of an internal DC supply signal and three, in particular at least three, four or at least four heating fre quency generating units, each for converting one DC supply sig nal supplied by two DC signal generating units into a heating frequency signal for supplying at least one heating unit with electrical power.
  • the power supply circuit is com prising a single frequency adapting unit, in particular filter ing unit, for adapting a or one AC external supply signal into one internal AC supply signal, and two DC signal generating units, each for converting the internal AC supply signal into one signal component of an internal DC supply signal and three, in particular at least three, four or at least four heating fre quency generating units, each for converting one DC supply sig
  • the power supply circuit is comprising at least two, two, at least three or three DC signal generating units, each for converting the internal AC supply signal into an internal DC supply signal or into at least one signal component, in particu lar one or each signal component, of an internal DC supply sig nal .
  • a power supply circuit according to the invention in particular when different heating frequency generating units are supplied with power, at least partially, by different inter nal DC supply signals, and, at the same time, operated with dif- ferent frequencies, interference between the different heating frequency generating units can be avoided or at least reduced.
  • noise and/or an exceeding of the maximum tolerable rate of rise or fall of a differential voltage, which preferably defines the immunity of the group of frequency generating units, of the heating frequency generating units in a group supplied with power by an or a single internal DC supply signal can be avoided or at least reduced.
  • the invention allows to share common parts between DC supply signals or DC buses.
  • only one external and inter nal AC supply signal can be sufficient for supplying the DC sig nal generating units with electrical power. Therefore a, prefer ably only one single, frequency adapting unit can be sufficient to supply the DC signal generating units of the power supply circuit with electrical power.
  • the invention is in par ticular cost-effective, as only one frequency adapting unit, in particular filtering circuit, can be necessary for the power supply circuit.
  • the invention is also flexible, as it allows to easily vary the number of units in the circuit. For example, for different cook ing devices, a different number of heating frequency generating units can be necessary. Depending on the number of heating fre quency generating units needed, in particular depending on the number of pairs of heating frequency generating units needed, the number of DC signal generating units and hence the number of DC supply signals can correspondingly vary.
  • the invention nevertheless allows a robust operation in terms of interference noise and immunity.
  • the invention al lows to reduce noise, in particular when no more than two heat ing frequency generating units, also denominated as generators, are operated by means of the same DC supply signal or on the same DC bus.
  • the same algorithm for noise reduc tion can be applied for each pair of heating frequency generat ing units, preferably in case each pair of heating frequency generating units is supplied by a different DC supply signal.
  • a DC supply signal is in particular a direct current supply sig nal with an unidirectional flow of electric charge.
  • the DC sup ply signal is in particular supplied by two different signal components which can be two different wires, wherein one of the signal components or wires provides a DC voltage and another one of the signal components or wires provides a ground or reference voltage. Nevertheless, the amplitude of the DC supply signal can vary .
  • An AC supply signal is in particular an alternating current sup ply signal with a bidirectional flow of electric charge.
  • the AC supply signal is in particular supplied by two different signal components which can be two different wires, wherein one of the signal components or wires provides an AC voltage and another one of the signal components or wires provides a ground or ref erence voltage.
  • An external AC supply signal is in particular a mains voltage signal with a single current and/or voltage phase.
  • each signal is supplied by a first and a sec ond signal component.
  • each DC signal generating unit supplies a DC voltage and the second signal com ponent supplies a ground voltage, wherein preferably each DC signal generating unit is connected to the same common ground voltage, GND.
  • the power supply circuit comprises a single internal AC supply signal.
  • the or one internal AC supply signal supplies one, at least one, two, at least two or at least three DC signal generating units with electrical power.
  • each DC supply signal constitutes a DC bus, wherein the power supply circuit in particular comprises two or at least two DC buses.
  • each DC supply signal supplies one, at least one, two, at least two or at least three heating frequency gen erating units with electrical power.
  • a first DC supply signal supplies one, at least one, two, at least two or at least three heating frequency generating units with electrical power and a second DC supply signal supplies one, at least one, two, at least two or at least three heating frequency generating units with electrical power.
  • each DC signal generating unit and/or each in ternal DC supply signal supplies two or at least two heating frequency generating units with electrical power.
  • the N DC buses can share a common signal compo nent, a common line or a common node. More in particular, the N DC buses can share a common ground signal component, a common ground line or a common ground node. More in particular, the N DC buses can share a common GND signal component, a common GND line or a common GND node.
  • each heating frequency signal comprises a fre quency of at least lOkHZ, in particular of at least 25kHz, and/or a frequency of less than lOOkHZ.
  • the generated heating power of the heating unit can be varied.
  • the frequency adapting unit comprises a fre quency filter circuit, in particular a low-pass filter circuit, an RC filter circuit and/or an LC filter circuit.
  • the DC signal generating units are rectifiers, in particular bridge and/or diode rectifiers and/or AC/DC con verters .
  • the DC signal generating units are half bridge rectifiers, in particular half bridge diode rectifiers, more in particular with only two diodes and/or with only one output and/or with common anode or cathode.
  • each DC signal generating unit comprises only a single DC output, each for supplying one signal component to at least one heating frequency generating unit.
  • the DC output of a first DC signal generating unit is connected to the first DC input of a first heating fre quency generating unit and the DC output of a second DC signal generating unit is connected to a second DC input of the first heating frequency generating unit.
  • the DC output of a third DC signal generating unit is connected to the first DC input of a second heating fre quency generating unit and the DC output of the second DC signal generating unit is connected to the second DC input of the sec ond heating frequency generating unit.
  • each heating frequency generating unit com prises two DC inputs, each for supplying one signal component from one or at least one DC signal generating unit.
  • each heating frequency generating unit com prises at least one electric switch, in particular at least one relay and/or at least one electronic switch, in particular at least one semiconductor switch, more in particular at least one insulated-gate bipolar transistor, IGBT. In an embodiment, each heating frequency generating unit com prises at least one half bridge circuit and/or at least one qua siresonant circuit for generating the heating frequency signal.
  • the power supply circuit is implemented on a single board, in particular on a single power board or printed circuit board, PCB .
  • the power supply circuit in particular on the printed circuit board, interacts with a control unit and/or with at least one user interface, in particular by means of a commu nication bus.
  • the control unit comprises a frequency control unit for controlling the heating frequencies of the heating fre quency generating units, in particular independently.
  • the frequency control unit comprises an inter- ference control unit for controlling the interference between heating frequency generating units, in particular between the heating frequency generating units supplied by a single DC bus.
  • the interference control unit comprises at least one of a noise reduction unit for reducing noise originat ing from an interference of different heating frequency generat ing units and/or an immunity unit for reducing parasitic effects originating from an electromagnetic interference of different heating frequency generating units, in particular of the heating frequency generating units supplied by a single DC bus.
  • the noise reduction unit comprises a means for shifting the frequency difference between the frequencies of the heating frequency signals of a first and a second heating fre quency generating unit to a frequency difference outside the au dible range, in particular by switching at least one frequency to either a first frequency, wherein the frequency difference is below the audible range, or to a second frequency, wherein the frequency difference is above the audible range, wherein in par ticular the first and the second heating frequency generating units establish a group of heating frequency generating units connected to the same DC bus.
  • the cumulated maximum power of the at least two, two, at least three or three DC signal generating units is larger than the maximum power of the frequency adapting unit.
  • the external supply signal is an AC voltage signal, in particular a one-phase AC voltage signal, preferably with a voltage of 220V to 250V.
  • the external supply signal is a mains voltage signal.
  • the invention also relates to a cooking device, in particular hob, more in particular induction hob with one, at least one, two, at least two or three power supply circuits according to the invention.
  • the cooking hob comprises at least one control unit and/or at least one user interface.
  • the cooking hob comprises at least four, in particular at least six, at least eight or at least twelve heat- ing units, wherein each heating unit preferably comprises at least one inductor, more preferably at least one coil.
  • the coils are shaped in triangular or circular form, wherein in particular two and/or four coils in triangular shape are arranged as a square.
  • the cooking hob comprises two or three power supply circuits, wherein each power supply circuit is arranged on a separated power board and/or each power supply circuit is supplied by a different voltage phase of a 2-phase or three- phase power supply.
  • FIG 1 shows a power supply circuit according to a preferred embodiment of the present invention
  • FIG 2 shows an alternative power supply circuit according to the preferred embodiment of the present invention
  • FIG 3 shows a cooking hob according to the preferred embodi ment of the present invention
  • FIG 4 shows an alternative cooking hob according to a pre ferred embodiment of the present invention
  • FIG 5 shows a cooking hob according to a preferred embodiment of the present invention.
  • FIG. 1 shows a power supply circuit 1 for a cooking device, in particular for an induction cooking device, more particularly for an induction hob 80.
  • the power supply circuit 1 is comprising a single frequency adapting unit 20, in particular filtering unit, for adapting an external supply signal 11, 12 into a or one internal AC supply signal 15, 16.
  • the frequency adapting unit 20 adapts, in partic ular filters, at least one frequency of the external supply sig nal 11, 12 and/or of the internal AC supply signal 15, 16.
  • the power supply circuit 1 is comprising two DC signal generat ing units 30, 35, each for converting the one internal AC supply signal 15, 16 into an internal DC supply signal 40, 41, 42, 43, in particular into two signal components of an internal DC sup- ply signal 40, 41, 42, 43.
  • the power supply circuit 1 is comprising at least two, in par ticular at least four, heating frequency generating units 50,
  • the power supply circuit 1 is preferably comprising at least two heating frequency generating units 50, each for converting the first DC supply signal 40, 41, supplied by the first DC signal generating unit 30, into heating frequency signals 61, 62 for supplying one, two or at least two heating units 70 with elec trical power.
  • the power supply circuit 1 is preferably comprising at least two heating frequency generating units 55, each for converting the second DC supply signal 42, 43, supplied by the second DC signal generating unit 35, into heating frequency signals 63, 64 for supplying one, two or at least two heating units 75 with elec trical power.
  • Each signal is supplied by a first and a second signal compo nent.
  • the internal AC signal 15, 16 is supplied by the first signal component 15 and the second signal component 16.
  • the first signal component 40 of the DC signal generating unit 30 supplies a first DC voltage and the second signal component
  • each of the DC signal generating units 30, 35 is con- nected to the same common ground voltage, GND.
  • the power supply circuit 1 comprises a single internal AC supply signal 15, 16.
  • the internal AC supply signal 15, 16 supplies two DC signal generating units 30, 35 with electrical power.
  • Each DC supply signal 40, 41; 42, 43 constitutes a DC bus, wherein the power supply circuit 1 in particular comprises two or at least two DC buses.
  • the DC supply signal 40, 41 consti tutes a first DC bus.
  • the DC supply signal 42, 43 constitutes a second DC bus.
  • Each DC supply signal 40, 41; 42, 43 supplies one, two or at least two heating frequency generating units 50, 55 with elec trical power.
  • the DC supply signal 40, 41 supplies one, two or at least two heating frequency generating units 50 with electri cal power.
  • the DC supply signal 42, 43 supplies one, two or at least two heating frequency generating units 55 with electrical power .
  • a first DC supply signal 40, 41 supplies one, at least one, two, at least two or at least three heating frequency generating units 50 with electrical power and a second DC supply signal 42, 43 supplies one, at least one, two, at least two or at least three heating frequency generating units 55 with electrical power .
  • the power supply circuit 1 comprises a number of N DC buses, wherein N > 1.
  • the power supply circuit 1 in FIG. 1 comprises a number of 2 DC buses.
  • each DC signal generating unit 30, 35 and/or each internal DC supply signal 40, 41; 42, 43 supplies two or at least two heating frequency generating units 70; 75 with elec trical power.
  • the N DC buses can share a common signal com ponent, a common line or a common node. More in particular, the N DC buses can share a common ground signal component, a com-mon ground line or a common ground node. More in particular, the N DC buses can share a common GND signal component, a com-mon GND line or a common GND node.
  • Each heating frequency signal 61, 62; 63, 64 comprises a fre quency of at least lOkHZ, in particular of at least 25kHz. The frequency can be varied for adjusting the power of the heating units 70, 75.
  • the heating frequency signal 61, 62 comprises a frequency of at least lOkHZ, in particular of at least 25kHz.
  • the heating frequency signal 63, 64 comprises a frequency of at least lOkHZ, in particular of at least 25kHz.
  • the frequency adapting unit 20 comprises a frequency filter cir cuit, in particular a low-pass filter circuit, an RC filter cir- cuit and/or an LC filter circuit.
  • the DC signal generating units 30, 35 can be rectifiers, in particular bridge and/or diode rectifiers and/or AC/DC convert ers and/or with common anode or cathode.
  • the DC signal generating units 30, 35 are in particular full bridge rectifiers, more in particular bridge diode rectifiers, more in particular with four diodes and/or with two outputs.
  • Each DC signal generating unit 30, 35 comprises two DC outputs 33, 34; 38, 39, each for supplying one signal component to at least one heating frequency generating unit 50, 55.
  • the DC sig nal generating unit 30 comprises two DC outputs 33, 34, each for supplying one signal component to at least one, preferably two, heating frequency generating units 50.
  • the DC signal generating unit 35 comprises two DC outputs 38, 39, each for supplying one signal component to at least one, preferably two or at least two heating frequency generating units 55.
  • Each heating frequency generating unit 50, 55 comprises two DC inputs 51, 52; 56, 57, each for supplying one signal component from the corresponding DC signal generating unit 30, 35.
  • the heating frequency generating units 50 each comprise two DC in- puts 51, 52, each for supplying one signal component from the corresponding DC signal generating unit 30.
  • the heating fre quency generating units 55 each comprise two DC inputs 55, 57, each for supplying one signal component from the corresponding DC signal generating unit 35.
  • Each heating frequency generating unit 50, 55 comprises at least one electric switch, in particular at least one relay and/or at least one electronic switch, in particular at least one semicon ductor switch, more in particular at least one insulated-gate bipolar transistor, IGBT.
  • Each heating frequency generating unit 50, 55 comprises at least one half bridge circuit and/or at least one quasiresonant cir cuit for generating the heating frequency signal.
  • the heating frequency generating units 50 comprise at least one half bridge circuit and/or at least one quasiresonant circuit.
  • the heating frequency generating units 55 comprise at least one half bridge circuit and/or at least one quasiresonant circuit.
  • the power supply circuit 1 is implemented on a single board 95, in particular on a single power board or printed circuit board,
  • the power supply circuit 1 on the printed circuit board 95 in teracts with a control unit 90 and with at least one user inter face 85, in particular by means of a communication bus. This in teraction is shown in FIG. 5.
  • the control unit 90 comprises a frequency control unit 91 for controlling the heating frequency of the heating frequency gen erating units 50, 55 on the power board 95, in particular inde pendently.
  • the frequency control unit 91 comprises an interference control unit 92 for controlling the interference between heating fre quency generating units 50, 55, in particular between the heat ing frequency generating units 50, 55 supplied by a single DC bus .
  • the interference control unit 92 comprises at least one of a noise reduction unit 93 for reducing noise originating from an interference of different heating frequency generating units 50, 55 and/or an immunity unit 94 for reducing parasitic effects originating from an electromagnetic interference of different heating frequency generating units 50, 55, in particular of the heating frequency generating units 50, 55 supplied by a single DC bus .
  • the noise reduction unit 93 comprises a means for shifting the frequency difference between the frequencies of the heating fre quency signals of a first and a second heating frequency gener ating unit 50, 55 to a frequency difference outside the audible range, in particular by switching at least one frequency to ei ther a first frequency, wherein the frequency difference is be low the audible range, or to a second frequency, wherein the frequency difference is above the audible range.
  • the cumulated maximum power of the two or at least two DC signal generating units 30, 35 is larger than the maximum power of the frequency adapting unit 20.
  • the external supply signal 10 is a one-phase AC voltage signal, in particular with a voltage of 220V to 250V.
  • the external supply signal is a mains voltage signal.
  • FIG. 2 shows a further power supply circuit 2 for a cooking de vice, in particular for an induction cooking device, more par- ticularly for an induction hob 80.
  • the power supply circuit 2 is comprising a single frequency adapting unit 20, in particular filtering unit, for adapting an or one external AC supply signal 11, 12 into one internal AC supply signal 17, 18.
  • the frequency adapting unit 20 adapts, in particular filters, at least one frequency of the external sup ply signal 11, 12 and/or of the internal AC supply signal 17,
  • the power supply circuit 2 is comprising three DC signal gener ating units 25, 30, 35, each for converting the one internal AC supply signal 17, 18 into one signal component of an internal DC supply signal 44; 45, 46.
  • the power supply circuit 2 is comprising at least two, in par ticular at least four, heating frequency generating units 50,
  • Each signal is supplied by a first and a second signal compo- nent .
  • the internal AC signal 17, 18 is supplied by the first signal component 17 and the second signal component 18.
  • the output 28 of the DC signal generating unit 25 supplies the first signal component 44 of a DC supply signal 44, 46 and the output 38 of the third DC signal generating unit 35 supplies a ground voltage as second signal component 46 of the DC supply signal 44, 46.
  • the output 33 of the second DC signal generating unit 30 sup plies the first signal component 45 of a DC supply signal 45, 46 and the output 38 of the third DC signal generating unit 35 sup plies a ground voltage as second signal component 46 of the DC supply signal 45, 46.
  • the DC signal generating unit 35 is con- nected to the same common ground voltage, GND.
  • the power supply circuit 2 comprises a single internal AC supply signal 17, 18.
  • the internal AC supply signal 17, 18 supplies two DC signal generating units 25, 30, 35 with electrical power.
  • Each DC supply signal 44, 46; 45, 46 constitutes a DC bus, wherein the power supply circuit 2 in particular comprises two or at least two DC buses.
  • the DC supply signal 44, 46 consti tutes a first DC bus.
  • the DC supply signal 45, 46 constitutes a second DC bus.
  • Each internal AC supply signal 17, 18 supplies three DC signal generating units 25, 30, 35 with electrical power.
  • the AC supply signal 17, 18 supplies three DC signal generating units 25, 30, 35 with electrical power.
  • Each DC supply signal 44, 46; 45, 46 supplies one, two or two heating frequency generating units 50, 55 with electrical power.
  • the DC supply signal 44, 46 supplies one, two or at least two heating frequency generating units 50 with electrical power.
  • the DC supply signal 45, 46 supplies one, two or at least two heat- ing frequency generating units 55 with electrical power.
  • a first DC supply signal 44, 46 supplies one, at least one, two, at least two or at least three heating frequency generating units 50 with electrical power and a second DC supply signal 45, 46 supplies one, at least one, two, at least two or at least three heating frequency generating units 55 with electrical power .
  • the power supply circuit 2 comprises a number of N DC buses, wherein N > 1.
  • the power supply circuit 2 in FIG. 2 comprises a number of 2 DC buses.
  • the N DC buses share a common signal component, a common line or a common node. More in particular, the N DC buses share a common ground signal component, a com-mon ground line or a common ground node. More in particular, the N DC buses share a common GND signal component, a com-mon GND line or a common GND node .
  • Each heating frequency signal 61, 62; 63, 64 comprises a fre quency of at least lOkHZ, in particular of at least 25kHz.
  • the heating frequency signal 61, 62 comprises a frequency of at least lOkHZ, in particular of at least 25kHz.
  • the heating fre- quency signal 63, 64 comprises a frequency of at least lOkHZ, in particular of at least 25kHz.
  • the frequency adapting unit 20 comprises a frequency filter cir cuit, in particular a low-pass filter circuit, an RC filter cir- cuit and/or an LC filter circuit.
  • the DC signal generating units 25, 30, 35 can be rectifiers, in particular bridge and/or diode rectifiers and/or AC/DC convert ers .
  • the DC signal generating units 25, 30, 35 are in particular half bridge rectifiers, more in particular half bridge diode rectifi ers, more in particular with only two diodes and/or with only one output and/or with common anode or cathode.
  • the DC signal generating units 25, 30, 35 in the embodiment of FIG. 2 are half bridge rectifiers by means of half bridge diode rectifiers. Those rectifiers comprise only two diodes, only one output as well as a common anode or cathode.
  • Each DC signal generating unit 25, 30, 35 comprises only a sin gle DC output 28, 33, 38, each for supplying one signal compo nent to at least one heating frequency generating unit 50, 55.
  • the DC signal generating unit 25 comprises only a single DC out- put 28, for supplying one signal component to at least one, preferably two or at least two, heating frequency generating units 50.
  • the DC signal generating unit 30 comprises only a sin gle DC output 33, for supplying one signal component to at least one, preferably two or at least two, heating frequency generat ing unit 55.
  • the DC signal generating unit 35 comprises only a single DC output 38, for supplying one signal component to at least two, preferably four or at least four heating frequency generating unit 50, 55.
  • the DC output 28 of a first DC signal generating unit 25 is con nected to the first DC input 51 of a first heating frequency generating unit 50 and the DC output 38 of a second DC signal generating unit 35 is connected to the second DC input 52 of the first heating frequency generating unit 52.
  • the DC output 33 of a third DC signal generating unit 30 is con nected to the first DC input 56 of a second heating frequency generating unit 55 and the DC output 38 of the second DC signal generating unit 35 is connected to the second DC input 57 of the second heating frequency generating unit 55.
  • Each heating frequency generating unit 50, 55 comprises two DC inputs 51, 52; 56, 57, each for supplying one signal component from the corresponding DC signal generating unit 25, 30, 35.
  • the heating frequency generating units 50 comprise two DC inputs 51, 52, each for supplying one signal component from the correspond ing DC signal generating unit 25, 30.
  • the heating frequency gen- erating units 55 each comprise two DC inputs 56, 57, each for supplying one signal component from the corresponding DC signal generating unit 25, 35.
  • Each heating frequency generating unit 50, 55 comprises at least one electric switch, in particular at least one relay and/or at least one electronic switch, in particular at least one semicon ductor switch, more in particular at least one insulated-gate bipolar transistor, IGBT.
  • Each heating frequency generating unit 50, 55 comprises at least one half bridge circuit and/or at least one quasiresonant cir cuit for generating the heating frequency signal.
  • the power supply circuit 2 is implemented on a single board 95, in particular on a single power board or printed circuit board,
  • the power supply circuit 2 on the printed circuit board 95 in- teracts with a control unit 90 and with at least one user inter face 85, in particular by means of a communication bus. This in teraction is shown in FIG. 5.
  • the control unit 90 comprises a frequency control unit 91 for controlling the heating frequency of the heating frequency gen erating units 50, 55 on the power board 95, in particular inde pendently.
  • the frequency control unit 91 comprises an interference control unit 92 for controlling the interference between heating fre quency generating units 50, 55, in particular between the heat ing frequency generating units 50, 55 supplied by a single DC bus .
  • Interference control unit 92 comprises at least one of a noise reduction unit 93 for reducing noise originating from an inter ference of different heating frequency generating units 50, 55 and/or an immunity unit 94 for reducing parasitic effects origi nating from an electromagnetic interference of different heating frequency generating units 50, 55, in particular of the heating frequency generating units 50, 55 supplied by a single DC bus.
  • the noise reduction unit 93 comprises a means for shifting the frequency difference between the frequencies of the heating fre quency signals of a first and a second heating frequency gener ating unit 50, 55 to a frequency difference outside the audible range, in particular by switching at least one frequency to ei ther a first frequency, wherein the frequency difference is be low the audible range, or to a second frequency, wherein the frequency difference is above the audible range.
  • the cumulated maximum power of the at least three or three DC signal generating units 25, 30, 35 is larger than the maximum power of the frequency adapting unit 20.
  • the external supply signal 10 is a one-phase AC voltage signal, in particular with a voltage of 220V to 250V.
  • the cooking hob is, in an embodiment, an induction hob 3 as shown in FIG. 3 and comprises four or at least four heating units 70, 75; 81, wherein each heating unit preferably comprises at least one inductor, more preferably at least one coil 81.
  • the coils 81 can be shaped in circular form, wherein in particu lar four coils in circular shape can be arranged as a square.
  • the coils 81 in FIG. 3 are shaped in circular form, wherein four coils are arranged as a square.
  • the cooking hob 3 comprises two power supply circuits 1, 2, wherein each power supply circuit 1 is arranged on a separated power board 95.
  • Each power supply circuit 1, 2 is supplied by a different voltage phase of a 2-phase power supply.
  • each power supply circuit 1 is supplied by a different voltage phase of a 2-phase power sup ply.
  • the cooking hob is, in an further embodiment, an induction hob 4 as shown in FIG. 4 and comprises twelve or at least twelve heat ing units 70, 75; 82, wherein each heating unit preferably com prises at least one inductor, more preferably at least one coil 82.
  • the coils 82 can be shaped in triangular form, wherein in par ticular two coils in triangular shape can be arranged as a square.
  • the coils 82 in FIG. 4 are shaped in triangular form, wherein two and also four coils in triangular shape are arranged as a square.
  • the cooking hob 4 comprises two or three power supply circuits 2, wherein each power supply circuit 2 is arranged on a sepa rated power board 95. Each power supply circuit 2 is supplied by a different voltage phase of a three-phase power supply. In case three power supply circuits 1, 2 are used, each power supply circuit 1, 2 can supplied by a different voltage phase of a 3- phase power supply.
  • FIG. 5 shows a hob or cooking hob 3, 4 with a user interface 85.
  • the user interface 85 is interacting with a control unit 90.
  • the control unit 90 is interacting with a one or at least one printed circuit board 95 with a power supply circuit 1, 2 ac- cording to the invention.
  • Each power supply circuit 1, 2 sup plies at least one or at least two groups of heating units 70,
  • the control unit 90 comprises a frequency control unit 91 as de- scribed above. List of reference numerals

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Induction Heating Cooking Devices (AREA)
  • General Induction Heating (AREA)
  • Control Of Resistance Heating (AREA)
  • Inverter Devices (AREA)

Abstract

The invention relates to a power supply circuit (1, 2) for a cooking device, in particular for an induction cooking device, more particularly for an induction hob (80), wherein the power supply circuit is comprising - a, in particular a single, frequency adapting unit (20), in particular filtering unit, for adapting at least one external supply signal (11, 12) into a single or at least one internal AC supply signal (15, 16; 17, 18), - and at least one, at least two, two, at least three or three DC signal generating units (25, 30, 35), each for converting the one or at least one internal AC supply signal (15, 16; 17, 18) into at least one signal component, in particular one or two signal components, of an internal DC supply signal (40, 41, 42, 43, 44; 45, 46) and - at least one, at least two, in particular two, at least three, three, at least four or four, heating frequency generating units (50, 55), each for converting one or at least one DC supply signal (40, 41; 42, 43; 44, 46; 45, 46) supplied by at least one DC signal generating unit (25, 30, 35) into a heating frequency signal (61, 62, 63, 64) for supplying at least one heating unit (70, 75) with electrical power.

Description

Description
POWER SUPPLY CIRCUIT FOR A COOKING DEVICE AND COOKING DEVICE
The invention relates to a power supply circuit for a cooking device, in particular for an induction cooking device, more par- ticularly for an induction hob, and to a corresponding cooking device .
Heating units for cooking devices, in particular for induction cooking devices, can be powered and/or operated by means of heating frequency generating units which each convert an inter nal DC supply signal into a heating frequency signal. In partic ular, for a power supply circuit, there can be a need to drive more than one or more than two heating units. In order to generate heating power, the heating frequency gener ating units can supply the heating units with a heating fre quency signal. Such an arrangement is shown in EP 2 095 686 B1. By means of a heating frequency signal, heating power can be generated in a heating unit.
For controlling the power supplied to the heating units individ ually for different heating units, preferably the frequencies of the heating frequency signals can be varied differently for dif ferent heating units.
However, in particular when a group of different heating fre quency generating units is supplied by the same internal DC sup ply signal and, at the same time, operated with different fre quencies, interference between the different heating frequency generating units can occur, which can result in disadvantageous effects, for example noise and an exceeding of the maximum tol erable rate of rise or fall of the differential voltages of the involved group of heating frequency generating units, which is preferably defined as the immunity of the group of frequency generating units. It is therefore an object of the invention to provide an im proved, and preferably cost effective and/or flexible, power supply circuit for a cooking device, which in particular avoids or at least reduces the disadvantageous effects as described above .
The object is solved in particular by the power supply circuit according to claim 1 and by a cooking device according to claim
13. Improvements are provided in the dependent claims. The invention relates to a power supply circuit for a cooking device, in particular for an induction cooking device, more par ticularly for an induction hob,
wherein the power supply circuit is comprising
- a, in particular a single, frequency adapting unit, in partic- ular filtering unit, for adapting at least one external supply signal into a single or at least one internal AC supply signal,
- at least one, at least two, two, at least three or three DC signal generating units, each for converting the one or at least one internal AC supply signal into at least one signal compo- nent, in particular one or two signal components, of an internal DC supply signal and
- at least one, at least two, in particular two, at least three, three, at least four or four, heating frequency generating units, each for converting one or at least one DC supply signal supplied by at least one DC signal generating unit into a heat ing frequency signal for supplying at least one heating unit with electrical power. The invention relates in particular to a power supply circuit for an induction hob, wherein the power supply circuit is com prising a single frequency adapting unit, in particular filter ing unit, for adapting a or one external AC supply signal into one internal AC supply signal, and two DC signal generating units, each for converting the internal AC supply signal into two signal components of an internal DC supply signal and three, in particular at least three, four or at least four heating fre quency generating units, each for converting a or one DC supply signal supplied by a or one DC signal generating unit into a heating frequency signal for supplying at least one heating unit with electrical power.
The invention relates in particular to a power supply circuit for an induction hob, wherein the power supply circuit is com prising a single frequency adapting unit, in particular filter ing unit, for adapting a or one AC external supply signal into one internal AC supply signal, and two DC signal generating units, each for converting the internal AC supply signal into one signal component of an internal DC supply signal and three, in particular at least three, four or at least four heating fre quency generating units, each for converting one DC supply sig nal supplied by two DC signal generating units into a heating frequency signal for supplying at least one heating unit with electrical power.
Preferably, the power supply circuit is comprising at least two, two, at least three or three DC signal generating units, each for converting the internal AC supply signal into an internal DC supply signal or into at least one signal component, in particu lar one or each signal component, of an internal DC supply sig nal . By means of a power supply circuit according to the invention, in particular when different heating frequency generating units are supplied with power, at least partially, by different inter nal DC supply signals, and, at the same time, operated with dif- ferent frequencies, interference between the different heating frequency generating units can be avoided or at least reduced.
For example, noise and/or an exceeding of the maximum tolerable rate of rise or fall of a differential voltage, which preferably defines the immunity of the group of frequency generating units, of the heating frequency generating units in a group supplied with power by an or a single internal DC supply signal can be avoided or at least reduced. In particular, it can be advantageous to power only one, only two, up to two, only three or only up to three heating frequency generating units with a respective internal DC supply signal as a group, so that a separated DC supply signal can be provided for each single or each pair or triple of heating frequency gen- erating units.
It has been investigated that interference can be controlled better and therefore at least reduced when not too many heating frequency generating units are supplied with a respective DC supply signal, in particular when a respective internal DC sup ply signal supplies not more than three, preferably not more than two heating frequency generating units with electrical power . The invention allows to share common parts between DC supply signals or DC buses. In particular, only one external and inter nal AC supply signal can be sufficient for supplying the DC sig nal generating units with electrical power. Therefore a, prefer ably only one single, frequency adapting unit can be sufficient to supply the DC signal generating units of the power supply circuit with electrical power. Hence, the invention is in par ticular cost-effective, as only one frequency adapting unit, in particular filtering circuit, can be necessary for the power supply circuit.
The invention is also flexible, as it allows to easily vary the number of units in the circuit. For example, for different cook ing devices, a different number of heating frequency generating units can be necessary. Depending on the number of heating fre quency generating units needed, in particular depending on the number of pairs of heating frequency generating units needed, the number of DC signal generating units and hence the number of DC supply signals can correspondingly vary.
Preferably, the invention nevertheless allows a robust operation in terms of interference noise and immunity. The invention al lows to reduce noise, in particular when no more than two heat ing frequency generating units, also denominated as generators, are operated by means of the same DC supply signal or on the same DC bus. In particular, the same algorithm for noise reduc tion can be applied for each pair of heating frequency generat ing units, preferably in case each pair of heating frequency generating units is supplied by a different DC supply signal.
A DC supply signal is in particular a direct current supply sig nal with an unidirectional flow of electric charge. The DC sup ply signal is in particular supplied by two different signal components which can be two different wires, wherein one of the signal components or wires provides a DC voltage and another one of the signal components or wires provides a ground or reference voltage. Nevertheless, the amplitude of the DC supply signal can vary . An AC supply signal is in particular an alternating current sup ply signal with a bidirectional flow of electric charge. The AC supply signal is in particular supplied by two different signal components which can be two different wires, wherein one of the signal components or wires provides an AC voltage and another one of the signal components or wires provides a ground or ref erence voltage. An external AC supply signal is in particular a mains voltage signal with a single current and/or voltage phase.
In an embodiment, each signal is supplied by a first and a sec ond signal component.
In an embodiment, the first signal component of each DC signal generating unit supplies a DC voltage and the second signal com ponent supplies a ground voltage, wherein preferably each DC signal generating unit is connected to the same common ground voltage, GND.
In an embodiment, the power supply circuit comprises a single internal AC supply signal.
In an embodiment, the or one internal AC supply signal supplies one, at least one, two, at least two or at least three DC signal generating units with electrical power.
In an embodiment, each DC supply signal constitutes a DC bus, wherein the power supply circuit in particular comprises two or at least two DC buses.
In an embodiment, each DC supply signal supplies one, at least one, two, at least two or at least three heating frequency gen erating units with electrical power. In an embodiment, a first DC supply signal supplies one, at least one, two, at least two or at least three heating frequency generating units with electrical power and a second DC supply signal supplies one, at least one, two, at least two or at least three heating frequency generating units with electrical power.
In an embodiment, the power supply circuit comprises a number of N DC buses, wherein N > 1, wherein in particular N=2 or N=3, wherein in particular each DC bus supplies a group of heating frequency generating units with electrical power.
In an embodiment, each DC signal generating unit and/or each in ternal DC supply signal supplies two or at least two heating frequency generating units with electrical power.
In particular, the N DC buses can share a common signal compo nent, a common line or a common node. More in particular, the N DC buses can share a common ground signal component, a common ground line or a common ground node. More in particular, the N DC buses can share a common GND signal component, a common GND line or a common GND node.
In an embodiment, each heating frequency signal comprises a fre quency of at least lOkHZ, in particular of at least 25kHz, and/or a frequency of less than lOOkHZ.
In an embodiment, by varying the frequency of the heating fre quency signal, the generated heating power of the heating unit can be varied.
In an embodiment, the frequency adapting unit comprises a fre quency filter circuit, in particular a low-pass filter circuit, an RC filter circuit and/or an LC filter circuit. In an embodiment, the DC signal generating units are rectifiers, in particular bridge and/or diode rectifiers and/or AC/DC con verters .
In an embodiment, the DC signal generating units are half bridge rectifiers, in particular half bridge diode rectifiers, more in particular with only two diodes and/or with only one output and/or with common anode or cathode.
In an embodiment, each DC signal generating unit comprises only a single DC output, each for supplying one signal component to at least one heating frequency generating unit.
In an embodiment, the DC output of a first DC signal generating unit is connected to the first DC input of a first heating fre quency generating unit and the DC output of a second DC signal generating unit is connected to a second DC input of the first heating frequency generating unit.
In an embodiment, the DC output of a third DC signal generating unit is connected to the first DC input of a second heating fre quency generating unit and the DC output of the second DC signal generating unit is connected to the second DC input of the sec ond heating frequency generating unit.
In an embodiment, each heating frequency generating unit com prises two DC inputs, each for supplying one signal component from one or at least one DC signal generating unit.
In an embodiment, each heating frequency generating unit com prises at least one electric switch, in particular at least one relay and/or at least one electronic switch, in particular at least one semiconductor switch, more in particular at least one insulated-gate bipolar transistor, IGBT. In an embodiment, each heating frequency generating unit com prises at least one half bridge circuit and/or at least one qua siresonant circuit for generating the heating frequency signal.
In an embodiment, the power supply circuit is implemented on a single board, in particular on a single power board or printed circuit board, PCB . In an embodiment, the power supply circuit, in particular on the printed circuit board, interacts with a control unit and/or with at least one user interface, in particular by means of a commu nication bus. In an embodiment, the control unit comprises a frequency control unit for controlling the heating frequencies of the heating fre quency generating units, in particular independently.
In an embodiment, the frequency control unit comprises an inter- ference control unit for controlling the interference between heating frequency generating units, in particular between the heating frequency generating units supplied by a single DC bus.
In an embodiment, the interference control unit comprises at least one of a noise reduction unit for reducing noise originat ing from an interference of different heating frequency generat ing units and/or an immunity unit for reducing parasitic effects originating from an electromagnetic interference of different heating frequency generating units, in particular of the heating frequency generating units supplied by a single DC bus.
In an embodiment, the noise reduction unit comprises a means for shifting the frequency difference between the frequencies of the heating frequency signals of a first and a second heating fre quency generating unit to a frequency difference outside the au dible range, in particular by switching at least one frequency to either a first frequency, wherein the frequency difference is below the audible range, or to a second frequency, wherein the frequency difference is above the audible range, wherein in par ticular the first and the second heating frequency generating units establish a group of heating frequency generating units connected to the same DC bus.
In an embodiment, the cumulated maximum power of the at least two, two, at least three or three DC signal generating units is larger than the maximum power of the frequency adapting unit. In an embodiment, the external supply signal is an AC voltage signal, in particular a one-phase AC voltage signal, preferably with a voltage of 220V to 250V. In an embodiment, the external supply signal is a mains voltage signal. The invention also relates to a cooking device, in particular hob, more in particular induction hob with one, at least one, two, at least two or three power supply circuits according to the invention. In an embodiment, the cooking hob comprises at least one control unit and/or at least one user interface.
In an embodiment, the cooking hob comprises at least four, in particular at least six, at least eight or at least twelve heat- ing units, wherein each heating unit preferably comprises at least one inductor, more preferably at least one coil. In an embodiment, the coils are shaped in triangular or circular form, wherein in particular two and/or four coils in triangular shape are arranged as a square. In an embodiment, the cooking hob comprises two or three power supply circuits, wherein each power supply circuit is arranged on a separated power board and/or each power supply circuit is supplied by a different voltage phase of a 2-phase or three- phase power supply.
The present invention will be described in further detail with reference to the drawings, in which
FIG 1 shows a power supply circuit according to a preferred embodiment of the present invention,
FIG 2 shows an alternative power supply circuit according to the preferred embodiment of the present invention, FIG 3 shows a cooking hob according to the preferred embodi ment of the present invention,
FIG 4 shows an alternative cooking hob according to a pre ferred embodiment of the present invention, and
FIG 5 shows a cooking hob according to a preferred embodiment of the present invention.
FIG. 1 shows a power supply circuit 1 for a cooking device, in particular for an induction cooking device, more particularly for an induction hob 80.
The power supply circuit 1 is comprising a single frequency adapting unit 20, in particular filtering unit, for adapting an external supply signal 11, 12 into a or one internal AC supply signal 15, 16. The frequency adapting unit 20 adapts, in partic ular filters, at least one frequency of the external supply sig nal 11, 12 and/or of the internal AC supply signal 15, 16.
The power supply circuit 1 is comprising two DC signal generat ing units 30, 35, each for converting the one internal AC supply signal 15, 16 into an internal DC supply signal 40, 41, 42, 43, in particular into two signal components of an internal DC sup- ply signal 40, 41, 42, 43.
The power supply circuit 1 is comprising at least two, in par ticular at least four, heating frequency generating units 50,
55, each for converting at least one DC supply signal 40, 41; 42, 43, each supplied by one DC signal generating unit 30, 35, into a heating frequency signal 61, 62; 63, 64 for supplying at least two heating units 70, 75 with electrical power.
The power supply circuit 1 is preferably comprising at least two heating frequency generating units 50, each for converting the first DC supply signal 40, 41, supplied by the first DC signal generating unit 30, into heating frequency signals 61, 62 for supplying one, two or at least two heating units 70 with elec trical power.
The power supply circuit 1 is preferably comprising at least two heating frequency generating units 55, each for converting the second DC supply signal 42, 43, supplied by the second DC signal generating unit 35, into heating frequency signals 63, 64 for supplying one, two or at least two heating units 75 with elec trical power.
Each signal is supplied by a first and a second signal compo nent. In particular, the internal AC signal 15, 16 is supplied by the first signal component 15 and the second signal component 16.
The first signal component 40 of the DC signal generating unit 30 supplies a first DC voltage and the second signal component
41 supplies a ground voltage. The first signal component 42 of the DC signal generating unit 35 supplies a second DC voltage and the second signal component 43 supplies a ground voltage. Preferably each of the DC signal generating units 30, 35 is con- nected to the same common ground voltage, GND.
The power supply circuit 1 comprises a single internal AC supply signal 15, 16. The internal AC supply signal 15, 16 supplies two DC signal generating units 30, 35 with electrical power.
Each DC supply signal 40, 41; 42, 43 constitutes a DC bus, wherein the power supply circuit 1 in particular comprises two or at least two DC buses. The DC supply signal 40, 41 consti tutes a first DC bus. The DC supply signal 42, 43 constitutes a second DC bus.
Each DC supply signal 40, 41; 42, 43 supplies one, two or at least two heating frequency generating units 50, 55 with elec trical power. The DC supply signal 40, 41 supplies one, two or at least two heating frequency generating units 50 with electri cal power. The DC supply signal 42, 43 supplies one, two or at least two heating frequency generating units 55 with electrical power . A first DC supply signal 40, 41 supplies one, at least one, two, at least two or at least three heating frequency generating units 50 with electrical power and a second DC supply signal 42, 43 supplies one, at least one, two, at least two or at least three heating frequency generating units 55 with electrical power .
The power supply circuit 1 comprises a number of N DC buses, wherein N > 1. The power supply circuit 1 in FIG. 1 comprises a number of 2 DC buses.
In an embodiment, each DC signal generating unit 30, 35 and/or each internal DC supply signal 40, 41; 42, 43 supplies two or at least two heating frequency generating units 70; 75 with elec trical power.
In an embodiment, the N DC buses can share a common signal com ponent, a common line or a common node. More in particular, the N DC buses can share a common ground signal component, a com-mon ground line or a common ground node. More in particular, the N DC buses can share a common GND signal component, a com-mon GND line or a common GND node. Each heating frequency signal 61, 62; 63, 64 comprises a fre quency of at least lOkHZ, in particular of at least 25kHz. The frequency can be varied for adjusting the power of the heating units 70, 75. The heating frequency signal 61, 62 comprises a frequency of at least lOkHZ, in particular of at least 25kHz. The heating frequency signal 63, 64 comprises a frequency of at least lOkHZ, in particular of at least 25kHz.
The frequency adapting unit 20 comprises a frequency filter cir cuit, in particular a low-pass filter circuit, an RC filter cir- cuit and/or an LC filter circuit.
The DC signal generating units 30, 35, can be rectifiers, in particular bridge and/or diode rectifiers and/or AC/DC convert ers and/or with common anode or cathode. The DC signal generating units 30, 35 are in particular full bridge rectifiers, more in particular bridge diode rectifiers, more in particular with four diodes and/or with two outputs.
Each DC signal generating unit 30, 35 comprises two DC outputs 33, 34; 38, 39, each for supplying one signal component to at least one heating frequency generating unit 50, 55. The DC sig nal generating unit 30 comprises two DC outputs 33, 34, each for supplying one signal component to at least one, preferably two, heating frequency generating units 50. The DC signal generating unit 35 comprises two DC outputs 38, 39, each for supplying one signal component to at least one, preferably two or at least two heating frequency generating units 55.
Each heating frequency generating unit 50, 55 comprises two DC inputs 51, 52; 56, 57, each for supplying one signal component from the corresponding DC signal generating unit 30, 35. The heating frequency generating units 50 each comprise two DC in- puts 51, 52, each for supplying one signal component from the corresponding DC signal generating unit 30. The heating fre quency generating units 55 each comprise two DC inputs 55, 57, each for supplying one signal component from the corresponding DC signal generating unit 35.
Each heating frequency generating unit 50, 55 comprises at least one electric switch, in particular at least one relay and/or at least one electronic switch, in particular at least one semicon ductor switch, more in particular at least one insulated-gate bipolar transistor, IGBT.
Each heating frequency generating unit 50, 55 comprises at least one half bridge circuit and/or at least one quasiresonant cir cuit for generating the heating frequency signal. The heating frequency generating units 50 comprise at least one half bridge circuit and/or at least one quasiresonant circuit. The heating frequency generating units 55 comprise at least one half bridge circuit and/or at least one quasiresonant circuit.
The power supply circuit 1 is implemented on a single board 95, in particular on a single power board or printed circuit board,
PCB . The power supply circuit 1 on the printed circuit board 95 in teracts with a control unit 90 and with at least one user inter face 85, in particular by means of a communication bus. This in teraction is shown in FIG. 5. The control unit 90 comprises a frequency control unit 91 for controlling the heating frequency of the heating frequency gen erating units 50, 55 on the power board 95, in particular inde pendently. The frequency control unit 91 comprises an interference control unit 92 for controlling the interference between heating fre quency generating units 50, 55, in particular between the heat ing frequency generating units 50, 55 supplied by a single DC bus .
The interference control unit 92 comprises at least one of a noise reduction unit 93 for reducing noise originating from an interference of different heating frequency generating units 50, 55 and/or an immunity unit 94 for reducing parasitic effects originating from an electromagnetic interference of different heating frequency generating units 50, 55, in particular of the heating frequency generating units 50, 55 supplied by a single DC bus . The noise reduction unit 93 comprises a means for shifting the frequency difference between the frequencies of the heating fre quency signals of a first and a second heating frequency gener ating unit 50, 55 to a frequency difference outside the audible range, in particular by switching at least one frequency to ei ther a first frequency, wherein the frequency difference is be low the audible range, or to a second frequency, wherein the frequency difference is above the audible range. The cumulated maximum power of the two or at least two DC signal generating units 30, 35 is larger than the maximum power of the frequency adapting unit 20.
The external supply signal 10 is a one-phase AC voltage signal, in particular with a voltage of 220V to 250V. The external supply signal is a mains voltage signal.
FIG. 2 shows a further power supply circuit 2 for a cooking de vice, in particular for an induction cooking device, more par- ticularly for an induction hob 80.
The power supply circuit 2 is comprising a single frequency adapting unit 20, in particular filtering unit, for adapting an or one external AC supply signal 11, 12 into one internal AC supply signal 17, 18. The frequency adapting unit 20 adapts, in particular filters, at least one frequency of the external sup ply signal 11, 12 and/or of the internal AC supply signal 17,
18. The power supply circuit 2 is comprising three DC signal gener ating units 25, 30, 35, each for converting the one internal AC supply signal 17, 18 into one signal component of an internal DC supply signal 44; 45, 46. The power supply circuit 2 is comprising at least two, in par ticular at least four, heating frequency generating units 50,
55, each for converting a DC supply signal 44, 46; 45, 46, each supplied by two DC signal generating units 25, 35; 30, 35, into a heating frequency signal 61, 62; 63, 64, each for supplying one, two or at least one heating unit 70, 75 with electrical power .
Each signal is supplied by a first and a second signal compo- nent . In particular, the internal AC signal 17, 18 is supplied by the first signal component 17 and the second signal component 18.
The output 28 of the DC signal generating unit 25 supplies the first signal component 44 of a DC supply signal 44, 46 and the output 38 of the third DC signal generating unit 35 supplies a ground voltage as second signal component 46 of the DC supply signal 44, 46. The output 33 of the second DC signal generating unit 30 sup plies the first signal component 45 of a DC supply signal 45, 46 and the output 38 of the third DC signal generating unit 35 sup plies a ground voltage as second signal component 46 of the DC supply signal 45, 46. The DC signal generating unit 35 is con- nected to the same common ground voltage, GND.
The power supply circuit 2 comprises a single internal AC supply signal 17, 18. The internal AC supply signal 17, 18 supplies two DC signal generating units 25, 30, 35 with electrical power.
Each DC supply signal 44, 46; 45, 46 constitutes a DC bus, wherein the power supply circuit 2 in particular comprises two or at least two DC buses. The DC supply signal 44, 46 consti tutes a first DC bus. The DC supply signal 45, 46 constitutes a second DC bus. Each internal AC supply signal 17, 18 supplies three DC signal generating units 25, 30, 35 with electrical power. The AC supply signal 17, 18 supplies three DC signal generating units 25, 30, 35 with electrical power. Each DC supply signal 44, 46; 45, 46 supplies one, two or two heating frequency generating units 50, 55 with electrical power. The DC supply signal 44, 46 supplies one, two or at least two heating frequency generating units 50 with electrical power. The DC supply signal 45, 46 supplies one, two or at least two heat- ing frequency generating units 55 with electrical power.
A first DC supply signal 44, 46 supplies one, at least one, two, at least two or at least three heating frequency generating units 50 with electrical power and a second DC supply signal 45, 46 supplies one, at least one, two, at least two or at least three heating frequency generating units 55 with electrical power .
The power supply circuit 2 comprises a number of N DC buses, wherein N > 1. The power supply circuit 2 in FIG. 2 comprises a number of 2 DC buses.
In FIG. 2, the N DC buses share a common signal component, a common line or a common node. More in particular, the N DC buses share a common ground signal component, a com-mon ground line or a common ground node. More in particular, the N DC buses share a common GND signal component, a com-mon GND line or a common GND node . Each heating frequency signal 61, 62; 63, 64 comprises a fre quency of at least lOkHZ, in particular of at least 25kHz. The heating frequency signal 61, 62 comprises a frequency of at least lOkHZ, in particular of at least 25kHz. The heating fre- quency signal 63, 64 comprises a frequency of at least lOkHZ, in particular of at least 25kHz.
The frequency adapting unit 20 comprises a frequency filter cir cuit, in particular a low-pass filter circuit, an RC filter cir- cuit and/or an LC filter circuit.
The DC signal generating units 25, 30, 35 can be rectifiers, in particular bridge and/or diode rectifiers and/or AC/DC convert ers .
The DC signal generating units 25, 30, 35 are in particular half bridge rectifiers, more in particular half bridge diode rectifi ers, more in particular with only two diodes and/or with only one output and/or with common anode or cathode.
The DC signal generating units 25, 30, 35 in the embodiment of FIG. 2 are half bridge rectifiers by means of half bridge diode rectifiers. Those rectifiers comprise only two diodes, only one output as well as a common anode or cathode.
Each DC signal generating unit 25, 30, 35 comprises only a sin gle DC output 28, 33, 38, each for supplying one signal compo nent to at least one heating frequency generating unit 50, 55. The DC signal generating unit 25 comprises only a single DC out- put 28, for supplying one signal component to at least one, preferably two or at least two, heating frequency generating units 50. The DC signal generating unit 30 comprises only a sin gle DC output 33, for supplying one signal component to at least one, preferably two or at least two, heating frequency generat ing unit 55. The DC signal generating unit 35 comprises only a single DC output 38, for supplying one signal component to at least two, preferably four or at least four heating frequency generating unit 50, 55.
The DC output 28 of a first DC signal generating unit 25 is con nected to the first DC input 51 of a first heating frequency generating unit 50 and the DC output 38 of a second DC signal generating unit 35 is connected to the second DC input 52 of the first heating frequency generating unit 52.
The DC output 33 of a third DC signal generating unit 30 is con nected to the first DC input 56 of a second heating frequency generating unit 55 and the DC output 38 of the second DC signal generating unit 35 is connected to the second DC input 57 of the second heating frequency generating unit 55.
Each heating frequency generating unit 50, 55 comprises two DC inputs 51, 52; 56, 57, each for supplying one signal component from the corresponding DC signal generating unit 25, 30, 35. The heating frequency generating units 50 comprise two DC inputs 51, 52, each for supplying one signal component from the correspond ing DC signal generating unit 25, 30. The heating frequency gen- erating units 55 each comprise two DC inputs 56, 57, each for supplying one signal component from the corresponding DC signal generating unit 25, 35.
Each heating frequency generating unit 50, 55 comprises at least one electric switch, in particular at least one relay and/or at least one electronic switch, in particular at least one semicon ductor switch, more in particular at least one insulated-gate bipolar transistor, IGBT. Each heating frequency generating unit 50, 55 comprises at least one half bridge circuit and/or at least one quasiresonant cir cuit for generating the heating frequency signal. The power supply circuit 2 is implemented on a single board 95, in particular on a single power board or printed circuit board,
PCB .
The power supply circuit 2 on the printed circuit board 95 in- teracts with a control unit 90 and with at least one user inter face 85, in particular by means of a communication bus. This in teraction is shown in FIG. 5.
The control unit 90 comprises a frequency control unit 91 for controlling the heating frequency of the heating frequency gen erating units 50, 55 on the power board 95, in particular inde pendently.
The frequency control unit 91 comprises an interference control unit 92 for controlling the interference between heating fre quency generating units 50, 55, in particular between the heat ing frequency generating units 50, 55 supplied by a single DC bus . Interference control unit 92 comprises at least one of a noise reduction unit 93 for reducing noise originating from an inter ference of different heating frequency generating units 50, 55 and/or an immunity unit 94 for reducing parasitic effects origi nating from an electromagnetic interference of different heating frequency generating units 50, 55, in particular of the heating frequency generating units 50, 55 supplied by a single DC bus. The noise reduction unit 93 comprises a means for shifting the frequency difference between the frequencies of the heating fre quency signals of a first and a second heating frequency gener ating unit 50, 55 to a frequency difference outside the audible range, in particular by switching at least one frequency to ei ther a first frequency, wherein the frequency difference is be low the audible range, or to a second frequency, wherein the frequency difference is above the audible range. The cumulated maximum power of the at least three or three DC signal generating units 25, 30, 35 is larger than the maximum power of the frequency adapting unit 20.
The external supply signal 10 is a one-phase AC voltage signal, in particular with a voltage of 220V to 250V.
The cooking hob is, in an embodiment, an induction hob 3 as shown in FIG. 3 and comprises four or at least four heating units 70, 75; 81, wherein each heating unit preferably comprises at least one inductor, more preferably at least one coil 81.
The coils 81 can be shaped in circular form, wherein in particu lar four coils in circular shape can be arranged as a square.
The coils 81 in FIG. 3 are shaped in circular form, wherein four coils are arranged as a square.
The cooking hob 3 comprises two power supply circuits 1, 2, wherein each power supply circuit 1 is arranged on a separated power board 95. Each power supply circuit 1, 2 is supplied by a different voltage phase of a 2-phase power supply. In case two power supply circuits 1, 2 are used, each power supply circuit 1 is supplied by a different voltage phase of a 2-phase power sup ply. The cooking hob is, in an further embodiment, an induction hob 4 as shown in FIG. 4 and comprises twelve or at least twelve heat ing units 70, 75; 82, wherein each heating unit preferably com prises at least one inductor, more preferably at least one coil 82.
The coils 82 can be shaped in triangular form, wherein in par ticular two coils in triangular shape can be arranged as a square. The coils 82 in FIG. 4 are shaped in triangular form, wherein two and also four coils in triangular shape are arranged as a square.
The cooking hob 4 comprises two or three power supply circuits 2, wherein each power supply circuit 2 is arranged on a sepa rated power board 95. Each power supply circuit 2 is supplied by a different voltage phase of a three-phase power supply. In case three power supply circuits 1, 2 are used, each power supply circuit 1, 2 can supplied by a different voltage phase of a 3- phase power supply.
FIG. 5 shows a hob or cooking hob 3, 4 with a user interface 85. The user interface 85 is interacting with a control unit 90. The control unit 90 is interacting with a one or at least one printed circuit board 95 with a power supply circuit 1, 2 ac- cording to the invention. Each power supply circuit 1, 2 sup plies at least one or at least two groups of heating units 70,
75 with electrical power.
The control unit 90 comprises a frequency control unit 91 as de- scribed above. List of reference numerals
1, 2 Power supply circuit
11, 12 External supply signal
15, 16 Internal AC supply signal
17, 18 Internal AC supply signal
20 Frequency adapting unit
21, 22 AC Input
23, 24 AC Output
25, 30, 35 DC signal generating unit
26, 27, 31 AC input
28, 33, 34 DC output
32, 36, 37 AC input
38, 39 DC output
40, 41, 42, 43 Internal DC supply signal
44 45, 46 Internal DC supply signal
50, 55 Heating frequency generating units
51, 52, 56, 57 DC input
53, 54, 58, 59 Heating frequency output
61, 62; 63, 64 Heating frequency signal
70, 75 Heating unit
71, 72, 76, 77 Heating frequency input
80 Induction hob
81, 82 Coils
85 User interface
91 Frequency control unit
92 Interference control unit
93 Noise reduction unit
94 Immunity unit
95 Printed circuit board

Claims

Claims
1. Power supply circuit (1, 2) for a cooking device, in partic ular for an induction cooking device, more particularly for an induction hob (80),
wherein the power supply circuit is comprising
a, in particular a single, frequency adapting unit (20), in particular filtering unit, for adapting at least one exter nal supply signal (11, 12) into a single or at least one in ternal AC supply signal (15, 16; 17, 18),
- at least one, at least two, two, at least three or three DC signal generating units (25, 30, 35) , each for converting the one or at least one internal AC supply signal (15, 16; 17, 18) into at least one signal component, in particular one or two signal components, of an internal DC supply sig- nal (40, 41, 42, 43, 44; 45, 46) and
at least one, at least two, in particular two, at least three, three, at least four or four, heating frequency gen erating units (50, 55), each for converting one or at least one DC supply signal (40, 41; 42, 43; 44, 46; 45, 46) sup- plied by at least one DC signal generating unit (25, 30, 35) into a heating frequency signal (61, 62, 63, 64) for supply ing at least one heating unit (70, 75) with electrical power .
2. Power supply circuit according to claim 1, wherein each sig nal is supplied by a first and a second signal component and/or
wherein the first signal component (40, 42) of each DC sig nal generating unit (25, 30, 35) supplies a DC voltage and the second signal component supplies a ground voltage, wherein preferably each DC signal generating unit (25, 30, 35) is connected to the same common ground voltage, GND.
3. Power supply circuit according to one of the preceding claims, wherein the power supply circuit (1, 2) comprises a single internal AC supply signal (15, 16; 17, 18) and/or wherein the or one internal AC supply signal (15, 16; 17, 18) supplies one, at least one, two, at least two or at least three DC signal generating units (25, 30, 35) with electrical power.
4. Power supply circuit according to one of the preceding
claims, wherein each DC supply signal (40, 41; 42, 43; 44, 45; 45, 46) constitutes a DC bus, wherein the power supply circuit in particular comprises two or at least two DC buses and/or
wherein each DC supply signal (40, 41; 42, 43; 44, 45; 45,
46) supplies one, at least one, two, at least two or at least three heating frequency generating units (50, 55) with electrical power and/or
wherein a first DC supply signal (40, 41; 44, 46) supplies one, at least one, two, at least two or at least three heat ing frequency generating units (50) with electrical power and a second DC supply signal (42, 43; 45, 46) supplies one, at least one, two, at least two or at least three heating frequency generating units (55) with electrical power and/or wherein the power supply circuit (1, 2) comprises a number of N DC buses, wherein N > 1, wherein in particular N=2 or N=3, wherein in particular each DC bus supplies a group of heating frequency generating units (55) with electrical power .
5. Power supply circuit according to one of the preceding
claims, wherein each heating frequency signal (61, 62, 63, 64) comprises a frequency of at least lOkHZ, in particular of at least 25kHz, and/or a frequency of less than lOOkHZ and/or wherein by varying the frequency of the heating frequency signal, the generated heating power of the heating unit can be varied.
6. Power supply circuit according to one of the preceding
claims, wherein the frequency adapting unit (20) comprises a frequency filter circuit, in particular a low-pass filter circuit, an RC filter circuit and/or an LC filter circuit.
7. Power supply circuit according to one of the preceding
claims, wherein the DC signal generating units (25, 30, 35) are rectifiers, in particular bridge and/or diode rectifiers and/or AC/DC converter and/or
wherein the DC signal generating units (25, 30, 35) are half bridge rectifiers, in particular half bridge diode rectifi ers, more in particular with only two diodes and/or with only one output and/or
wherein each DC signal generating unit (25, 30, 35) com prises only a single DC output, each for supplying one sig nal component to at least one heating frequency generating unit .
8. Power supply circuit according to one of the preceding
claims, wherein the DC output (28) of a first DC signal gen erating unit (25) is connected to the first DC input (51) of a first heating frequency generating unit (50) and the DC output (38) of a second DC signal generating unit (35) is connected to a second DC input (52) of the first heating frequency generating unit (50) and/or
wherein the DC output (33) of a third DC signal generating unit (30) is connected to the first DC input (56) of a sec ond heating frequency generating unit (55) and the DC output (38) of the second DC signal generating unit (35) is con nected to the second DC input (57) of the second heating frequency generating unit (55) .
9. Power supply circuit according to one of the preceding
claims, wherein each heating frequency generating unit (50, 55) comprises two DC inputs (51, 52; 56, 57), each for sup plying one signal component from one or at least one DC sig nal generating unit (25, 30, 35) and/or
wherein each heating frequency generating unit (50, 55) com prises at least one electric switch, in particular at least one relay and/or at least one electronic switch, in particu lar at least one semiconductor switch, more in particular at least one insulated-gate bipolar transistor, IGBT and/or wherein each heating frequency generating unit (50, 55) com prises at least one half bridge circuit and/or at least one quasiresonant circuit for generating the heating frequency signal .
10. Power supply circuit according to one of the preceding
claims, wherein the power supply circuit (1, 2) is imple mented on a single board (95), in particular on a single power board or printed circuit board, PCB .
11. Power supply circuit according to one of the preceding
claims, wherein the power supply circuit (1, 2), in particu lar on the printed circuit board (95), interacts with a con trol unit (90) and/or with at least one user interface (85), in particular by means of a communication bus and/or
wherein the control unit (90) comprises a frequency control unit (91) for controlling the heating frequencies of the heating frequency generating units (50, 55), in particular independently and/or wherein the frequency control unit (91) comprises an inter ference control unit (92) for controlling the interference between heating frequency generating units (50, 55), in par ticular between the heating frequency generating units (50, 55) supplied by a single DC bus and/or
wherein the interference control unit (92) comprises at least one of a noise reduction unit (93) for reducing noise originating from an interference of different heating fre quency generating units (50, 55) and/or an immunity unit (94) for reducing parasitic effects originating from an electromagnetic interference of different heating frequency generating units (50, 55), in particular of the heating fre quency generating units (50, 55) supplied by a single DC bus and/or
wherein the noise reduction unit (93) comprises a means for shifting the frequency difference between the frequencies of the heating frequency signals of a first and a second heat ing frequency generating unit (50, 55) to a frequency dif ference outside the audible range, in particular by switch ing at least one frequency to either a first frequency, wherein the frequency difference is below the audible range, or to a second frequency, wherein the frequency difference is above the audible range, wherein in particular the first and the second heating frequency generating units (50, 55) establish a group of heating frequency generating units con nected to the same DC bus.
12. Power supply circuit according to one of the preceding
claims, wherein the cumulated maximum power of the at least two, two, at least three or three DC signal generating units (25, 30, 35) is larger than the maximum power of the fre quency adapting unit (20) and/or wherein the external supply signal (10) is an AC voltage signal, in particular a one-phase AC voltage signal, prefer ably with a voltage of 220V to 250V.
13. Cooking device, in particular hob, more in particular induc tion hob with one, at least one, two, at least two or three power supply circuits according to one of the preceding claims .
14. Cooking device according to claim 13, wherein the cooking hob comprises at least one control unit (90) and/or at least one user interface (95) and/or
wherein the cooking hob comprises at least four, in particu lar at least six, at least eight or at least twelve heating units (70, 75), wherein each heating unit preferably com prises at least one inductor, more preferably at least one coil and/or
wherein the coils (81, 82) are shaped in triangular or cir cular form, wherein in particular two and/or four coils in triangular shape are arranged as a square.
15. Cooking device according to claim 13 or 14, wherein the
cooking hob comprises two or three power supply circuits, wherein each power supply circuit is arranged on a separated power board and/or each power supply circuit is supplied by a different voltage phase of a 2-phase or three-phase power supply .
PCT/EP2020/054560 2019-03-04 2020-02-20 Power supply circuit for a cooking device and cooking device Ceased WO2020178043A1 (en)

Priority Applications (5)

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AU2020230845A AU2020230845B2 (en) 2019-03-04 2020-02-20 Power supply circuit for a cooking device and cooking device
KR1020217028692A KR102876672B1 (en) 2019-03-04 2020-02-20 Power supply circuit for cooking device and cooking device
CN202080018451.1A CN113508640B (en) 2019-03-04 2020-02-20 Power supply circuit for cooking equipment and cooking equipment
BR112021017490-7A BR112021017490B1 (en) 2019-03-04 2020-02-20 Power supply circuit for a cooking device and cooking appliance.
US17/433,635 US12232242B2 (en) 2019-03-04 2020-02-20 Power supply circuit for a cooking device and cooking device

Applications Claiming Priority (2)

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EP19160569.0A EP3706509A1 (en) 2019-03-04 2019-03-04 Power supply circuit for a cooking device and cooking device
EP19160569.0 2019-03-04

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EP (1) EP3706509A1 (en)
KR (1) KR102876672B1 (en)
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KR102876672B1 (en) 2025-10-24
US20220151035A1 (en) 2022-05-12
BR112021017490A2 (en) 2021-11-23
CN113508640B (en) 2024-05-10
CN113508640A (en) 2021-10-15
KR20210136020A (en) 2021-11-16
EP3706509A1 (en) 2020-09-09
AU2020230845A1 (en) 2021-08-05
AU2020230845B2 (en) 2025-08-21

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