EP2659733A2 - An induction heating cooker - Google Patents

An induction heating cooker

Info

Publication number
EP2659733A2
EP2659733A2 EP11802755.6A EP11802755A EP2659733A2 EP 2659733 A2 EP2659733 A2 EP 2659733A2 EP 11802755 A EP11802755 A EP 11802755A EP 2659733 A2 EP2659733 A2 EP 2659733A2
Authority
EP
European Patent Office
Prior art keywords
voltage
heating cooker
induction coil
induction heating
additional
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP11802755.6A
Other languages
German (de)
French (fr)
Other versions
EP2659733B1 (en
Inventor
Metin OZTURK
Namik Yilmaz
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.)
Arcelik AS
Original Assignee
Arcelik AS
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 Arcelik AS filed Critical Arcelik AS
Publication of EP2659733A2 publication Critical patent/EP2659733A2/en
Application granted granted Critical
Publication of EP2659733B1 publication Critical patent/EP2659733B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/06—Control, e.g. of temperature, of power
    • H05B6/062—Control, e.g. of temperature, of power for cooking plates or the like

Definitions

  • the present invention relates to an induction heating cooker comprising the electronic elements that carry high current.
  • the induction heating cooker functions according to the principle of heating a cast iron or steel ferromagnetic cooking container with the magnetic field effect generated by the induction coil.
  • the energy efficiency of induction heating cookers is considerably high since the heat required for cooking is not generated in the gas or electric burners on the cooker but directly in the cooking container.
  • high amount of electric current is conducted through electronic switching elements like the power switch (IGBT-Insulated Gate Bipolar Transistor or Mosfet) and the diode bridge on the circuit board.
  • the quasi resonant converter circuit realized by one IGBT and one resonant capacitor that provides cost advantage is used besides the half bridge series resonant converter realized by using two switches and two resonant capacitors.
  • the resonant capacitor is connected in parallel with the induction coil in contrast to the half bridge series resonant converter circuit wherein the induction coils and the resonant capacitors are connected in series.
  • One end of the IGBT switch is connected in series to one end of the parallel connected coil and capacitor and the other end is connected to the reference output point of the rectified voltage.
  • This structure that is connected in series is connected to the intermediate circuit voltage.
  • the disadvantage of this drive circuit is that it can work in narrower power frequency range and the maximum value thereof is limited.
  • the basic parameter limiting the operating range is that in low load conditions, the voltage occurring on the switch during switching does not to fall to zero and results in high losses on the switches and the drawing of high value capacitor charge currents in the IGBT switch.
  • the transmission operating conditions in the quasi resonant structure having low cost single IGBT and single resonant capacitor is determined largely by the load itself.
  • the control and switching electronics are expected to energize the load at suitable moments.
  • the aim of the present invention is the realization of an induction heating cooker wherein the power losses are decreased.
  • the induction heating cooker realized in order to attain the aim of the present invention, explicated in the first claim and the respective claims thereof, comprises at least one additional capacitor parallel to the resonant capacitor and the induction coil connected parallel to each other.
  • the induction coil is provided to operate in a wide power range by activating or deactivating the additional capacitor by the control unit.
  • the additional capacitor When the voltage passing through the induction coil gets near the upper limit, the additional capacitor is activated by the control unit and provides the induction coil to be able to operate at higher power level. When the voltage passing through the induction coil gets near the lower limit, the additional capacitor is deactivated by the control unit, thereby providing the induction coil to operate at lower power level.
  • the induction heating cooker comprises two additional capacitors and the induction coil is operated at three different levels.
  • the resonant capacitor is conducting at all levels. In the high power level, both of the additional capacitors are conducting. In the middle power level only one of the additional capacitors is conducting.
  • the operating range of the induction coil and the highest and lowest power levels of usability are increased by making the total capacity value of the capacitors connected parallel to the induction coil variable.
  • Figure 1 – is the schematic view of an induction heating cooker.
  • the induction heating cooker (1) comprises a mains filtering circuit (2), a diode bridge rectifier (3) providing the alternative current received from the mains to be converted to direct current, a filtering circuit (4) that cleans the voltage signal delivered by the diode bridge rectifier (3) from high frequency noises, a power switch (5) that drives the voltage received from the filtering circuit (4) to high frequency voltage, an induction coil (7) connected in series to the end of the power switch (5), providing the ferromagnetic cooking container placed thereon to be heated with the magnetic field generated and a resonant capacitor (6) connected parallel to the induction coil (7).
  • the induction heating cooker (1) comprises at least one additional capacitor (8, 108) connected in parallel to the induction coil (7).
  • the induction heating cooker (1) furthermore comprises a voltage detecting circuit (10), one end connected to the collector point (K) prior to the power switch (5) and that measures the voltage (V1) at the collector point (K) and a control unit (11) that compares the voltage (V1) at the collector point (K) measured by the voltage detecting circuit (10) with the voltage upper limit value (Vu) and the voltage lower limit value (Va) prerecorded in its memory by the producer, that activates or deactivates the additional capacitors (8, 108) if the voltage (V1) at the collector point (K) is around the voltage upper limit value (Vu) and the voltage lower limit value (Va).
  • a voltage detecting circuit (10) one end connected to the collector point (K) prior to the power switch (5) and that measures the voltage (V1) at the collector point (K)
  • a control unit (11) that compares the voltage (V1) at the collector point (K) measured by the voltage detecting circuit (10) with the voltage upper limit value (Vu) and the voltage lower limit value (V
  • the induction coil (7) can be operated at different power levels by an adjustment means (not shown in the figures) that is actuated by the user.
  • the induction heating cooker (1) furthermore comprises a switch (9, 109) that is connected in series to each additional capacitor (8, 108).
  • the control unit (11) activates at least one of the switches (9, 109) and provides current to be conducted through at least one of the additional capacitors (8, 108).
  • the total capacity value increases and the induction coil (7) can be driven at high power level since the additional capacitor (8, 108) that starts conducting and the resonant capacitor (6) are connected in parallel.
  • the control unit (11) provides to cut off the current conducted through at least one of the additional capacitors (8, 108) by deactivating at least one of the switches (9, 109).
  • the total capacity value decreases and the induction coil (7) can be operated at low power level since the switched off additional capacitor (8, 108) and the resonant capacitor (6) are connected in parallel.
  • the induction heating cooker (1) comprises a current detecting circuit (12) that measures the current at the output of the power switch (5) and a power switch drive circuit (13) that activates or deactivates the power switch (5).
  • the current detecting circuit (12) detects the momentary peaks in the current (I) when the voltage (V1) measured at the collector point (K) reaches the voltage lower limit value (Va) if the induction coil (7) is driven at low power level.
  • the current detecting circuit (12) transmits the detected momentary current (I) peaks to the control unit (11).
  • the control unit (11) deactivates the additional capacitors (8, 108) at the momentary current (I) peaks.
  • the induction heating cooker (1) comprises two additional capacitors (8, 108) and two switches (9, 109).
  • the induction coil (7) is operated at three different levels (A1, A2, A3) and at three different power scales at each level (A1, A2, A3), in total nine different power scales by means of an adjustment means (not shown in the figures) that is actuated by the user .
  • Only the resonant capacitor (6) is activated while the induction coil (7) is operated at low power level (A1).
  • the control unit (11) does not activate the additional capacitors (8, 108).
  • the resonant capacitor (6) and the first additional capacitor (8) are conducting while the induction coil (7) is operated at middle power level (A2).
  • the control unit (11) does not activate the other additional capacitor (108).
  • the resonant capacitor (6) and the additional capacitors (8, 108) are conducting while the induction coil (7) is operated at high power level (A3).
  • the induction coil (7) is provided to be driven electrically safely and in a wide range of power by means of activating or deactivating the additional capacitors (8, 108) connected in parallel to the induction coil (7) by the control unit (11) depending on the power value whereat the induction coil (7) is operated.
  • the additional capacitors (8, 108) connected parallel to the resonant capacitor (6) passing of momentary high voltage through the power switch (5) and damaging of the power switch (5) are prevented.

Landscapes

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

Abstract

The present invention relates to an induction heating cooker (1) that comprises a mains filtering circuit (2), a diode bridge rectifier (3) providing the alternative current received from the mains to be converted to direct current, a filtering circuit (4) that cleans the voltage signal delivered by the diode bridge rectifier (3) from high frequency noises, a power switch (5) that drives the voltage received from the filtering circuit (4) to high frequency voltage, an induction coil (7) connected in series to the end of the power switch (5), providing the ferromagnetic cooking container placed thereon to be heated with the magnetic field generated and a resonant capacitor (6) connected parallel to the induction coil (7).

Description

    AN INDUCTION HEATING COOKER
  • The present invention relates to an induction heating cooker comprising the electronic elements that carry high current.
  • The induction heating cooker functions according to the principle of heating a cast iron or steel ferromagnetic cooking container with the magnetic field effect generated by the induction coil. The energy efficiency of induction heating cookers is considerably high since the heat required for cooking is not generated in the gas or electric burners on the cooker but directly in the cooking container. In order to drive the induction coils generating magnetic field, high amount of electric current is conducted through electronic switching elements like the power switch (IGBT-Insulated Gate Bipolar Transistor or Mosfet) and the diode bridge on the circuit board. In the state of the art, for driving the induction coils, the quasi resonant converter circuit realized by one IGBT and one resonant capacitor that provides cost advantage is used besides the half bridge series resonant converter realized by using two switches and two resonant capacitors. In this circuit, the resonant capacitor is connected in parallel with the induction coil in contrast to the half bridge series resonant converter circuit wherein the induction coils and the resonant capacitors are connected in series. One end of the IGBT switch is connected in series to one end of the parallel connected coil and capacitor and the other end is connected to the reference output point of the rectified voltage. This structure that is connected in series is connected to the intermediate circuit voltage. The disadvantage of this drive circuit is that it can work in narrower power frequency range and the maximum value thereof is limited. The basic parameter limiting the operating range is that in low load conditions, the voltage occurring on the switch during switching does not to fall to zero and results in high losses on the switches and the drawing of high value capacitor charge currents in the IGBT switch. The transmission operating conditions in the quasi resonant structure having low cost single IGBT and single resonant capacitor is determined largely by the load itself. The control and switching electronics are expected to energize the load at suitable moments.
  • In the state of the art European Patent No. EP 0 888 033 B1, the control circuit and the control method used in an induction heating cooker is explained.
  • The aim of the present invention is the realization of an induction heating cooker wherein the power losses are decreased.
  • The induction heating cooker realized in order to attain the aim of the present invention, explicated in the first claim and the respective claims thereof, comprises at least one additional capacitor parallel to the resonant capacitor and the induction coil connected parallel to each other. The induction coil is provided to operate in a wide power range by activating or deactivating the additional capacitor by the control unit.
  • When the voltage passing through the induction coil gets near the upper limit, the additional capacitor is activated by the control unit and provides the induction coil to be able to operate at higher power level. When the voltage passing through the induction coil gets near the lower limit, the additional capacitor is deactivated by the control unit, thereby providing the induction coil to operate at lower power level.
  • In an embodiment of the present invention, the induction heating cooker comprises two additional capacitors and the induction coil is operated at three different levels. The resonant capacitor is conducting at all levels. In the high power level, both of the additional capacitors are conducting. In the middle power level only one of the additional capacitors is conducting.
  • In the induction heating cooker, the operating range of the induction coil and the highest and lowest power levels of usability are increased by making the total capacity value of the capacitors connected parallel to the induction coil variable.
  • The induction heating cooker realized in order to attain the aim of the present invention is illustrated in the attached figures, where:
  • Figure 1 – is the schematic view of an induction heating cooker.
  • The elements illustrated in the figures are numbered as follows:
    1. Induction heating cooker
    2. Mains filtering circuit
    3. Diode bridge rectifier
    4. Filtering circuit
    5. Power switch
    6. Resonant capacitor
    7. Induction coil
    8. , 108. Additional capacitor
    9. , 109. Switch
    10. Voltage detecting circuit
    11. Control unit
    12. Current detecting circuit
    13. Power switch drive circuit
  • The induction heating cooker (1) comprises a mains filtering circuit (2), a diode bridge rectifier (3) providing the alternative current received from the mains to be converted to direct current, a filtering circuit (4) that cleans the voltage signal delivered by the diode bridge rectifier (3) from high frequency noises, a power switch (5) that drives the voltage received from the filtering circuit (4) to high frequency voltage, an induction coil (7) connected in series to the end of the power switch (5), providing the ferromagnetic cooking container placed thereon to be heated with the magnetic field generated and a resonant capacitor (6) connected parallel to the induction coil (7).
  • The induction heating cooker (1) comprises at least one additional capacitor (8, 108) connected in parallel to the induction coil (7).
  • The induction heating cooker (1) furthermore comprises a voltage detecting circuit (10), one end connected to the collector point (K) prior to the power switch (5) and that measures the voltage (V1) at the collector point (K) and a control unit (11) that compares the voltage (V1) at the collector point (K) measured by the voltage detecting circuit (10) with the voltage upper limit value (Vu) and the voltage lower limit value (Va) prerecorded in its memory by the producer, that activates or deactivates the additional capacitors (8, 108) if the voltage (V1) at the collector point (K) is around the voltage upper limit value (Vu) and the voltage lower limit value (Va).
  • As the conducting time of the power switch (5) increases, the amount of energy delivered to the induction coil (7) increases in direct proportion. The induction coil (7) can be operated at different power levels by an adjustment means (not shown in the figures) that is actuated by the user.
  • The induction heating cooker (1) furthermore comprises a switch (9, 109) that is connected in series to each additional capacitor (8, 108).
  • If the user drives the induction coil (7) at high power level, the voltage (V1) measured at the collector point (K) gets closer to the voltage upper limit value (Vu). In this case, the control unit (11) activates at least one of the switches (9, 109) and provides current to be conducted through at least one of the additional capacitors (8, 108). The total capacity value increases and the induction coil (7) can be driven at high power level since the additional capacitor (8, 108) that starts conducting and the resonant capacitor (6) are connected in parallel.
  • If the user drives the induction coil (7) at low power level, the voltage (V1) measured at the collector point (K) gets closer to the voltage lower limit value (Va). In this case, the control unit (11) provides to cut off the current conducted through at least one of the additional capacitors (8, 108) by deactivating at least one of the switches (9, 109). The total capacity value decreases and the induction coil (7) can be operated at low power level since the switched off additional capacitor (8, 108) and the resonant capacitor (6) are connected in parallel.
  • In an embodiment of the present invention, the induction heating cooker (1) comprises a current detecting circuit (12) that measures the current at the output of the power switch (5) and a power switch drive circuit (13) that activates or deactivates the power switch (5). The current detecting circuit (12) detects the momentary peaks in the current (I) when the voltage (V1) measured at the collector point (K) reaches the voltage lower limit value (Va) if the induction coil (7) is driven at low power level. The current detecting circuit (12) transmits the detected momentary current (I) peaks to the control unit (11). The control unit (11) deactivates the additional capacitors (8, 108) at the momentary current (I) peaks.
  • In an embodiment of the present invention, the induction heating cooker (1) comprises two additional capacitors (8, 108) and two switches (9, 109). The induction coil (7) is operated at three different levels (A1, A2, A3) and at three different power scales at each level (A1, A2, A3), in total nine different power scales by means of an adjustment means (not shown in the figures) that is actuated by the user . Only the resonant capacitor (6) is activated while the induction coil (7) is operated at low power level (A1). The control unit (11) does not activate the additional capacitors (8, 108). The resonant capacitor (6) and the first additional capacitor (8) are conducting while the induction coil (7) is operated at middle power level (A2). The control unit (11) does not activate the other additional capacitor (108). The resonant capacitor (6) and the additional capacitors (8, 108) are conducting while the induction coil (7) is operated at high power level (A3).
  • In the induction heating cooker (1), the induction coil (7) is provided to be driven electrically safely and in a wide range of power by means of activating or deactivating the additional capacitors (8, 108) connected in parallel to the induction coil (7) by the control unit (11) depending on the power value whereat the induction coil (7) is operated. By means of the additional capacitors (8, 108) connected parallel to the resonant capacitor (6), passing of momentary high voltage through the power switch (5) and damaging of the power switch (5) are prevented.
  • It is to be understood that the present invention is not limited by the embodiments disclosed above and a person skilled in the art can easily introduce different embodiments. These should be considered within the scope of the protection postulated by the claims of the present invention.

Claims (7)

  1. An induction heating cooker (1) comprising a mains filtering circuit (2), a diode bridge rectifier (3) providing the alternative current received from the mains to be converted to direct current, a filtering circuit (4) that cleans the voltage signal delivered by the diode bridge rectifier (3) from high frequency noises, a power switch (5) that drives the voltage received from the filtering circuit (4) to high frequency voltage, an induction coil (7) connected in series to the end of the power switch (5), providing the ferromagnetic cooking container placed thereon to be heated with the magnetic field generated and a resonant capacitor (6) connected parallel to the induction coil (7), characterized by at least one additional capacitor (8, 108) that is connected parallel to the induction coil (7).
  2. An induction heating cooker (1) as in Claim 1, characterized by a voltage detecting circuit (10), one end connected to the collector point (K) prior to the power switch (5) and that measures the voltage (V1) at the collector point (K) and a control unit (11) that compares the voltage (V1) at the collector point (K) measured by the voltage detecting circuit (10) with the voltage upper limit value (Vu) and the voltage lower limit value (Va) prerecorded in its memory by the producer, that activates or deactivates the additional capacitors (8, 108) if the voltage (V1) at the collector point (K) is around the voltage upper limit value (Vu) and the voltage lower limit value (Va).
  3. An induction heating cooker (1) as in Claim 1 or 2, characterized by a switch (9, 109) that is connected in series to each additional capacitor (8, 108).
  4. An induction heating cooker (1) as in Claim 3, characterized by the control unit (11) that activates at least one of the switches (9, 109) and provides current to be conducted through at least one of the additional capacitors (8, 108) when the voltage (V1) measured at the collector point (K) gets closer to the voltage upper limit value (Vu).
  5. An induction heating cooker (1) as in Claim 3 or 4, characterized by the control unit (11) that deactivates at least one of the switches (9, 109) and provides to cut off the current conducted through at least one of the additional capacitors (8, 108) when the voltage (V1) measured at the collector point (K) gets closer to the voltage lower limit value (Va).
  6. An induction heating cooker (1) as in any one of the Claims 2 to 5, characterized by two additional capacitors (8, 108) and two switches (9, 109) and the induction coil (7) that is operated at three different levels (A1, A2, A3) and at three different power scales at each level (A1, A2, A3), in total nine different power scales.
  7. An induction heating cooker (1) as in Claim 6, characterized by the control unit (11) that activates only the resonant capacitor (6), not activating the additional capacitors (8, 108) while the induction coil (7) is operated at low power level (A1), that activates the resonant capacitor (6) and the first additional capacitor (8), not activating the other additional capacitor (108) while the induction coil (7) is operated at middle power level (A2), and that activates the resonant capacitor (6) and the additional capacitors (8, 108) while the induction coil (7) is operated at high power level (A3).
EP11802755.6A 2010-12-31 2011-12-26 An induction heating cooker Not-in-force EP2659733B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
TR201011265 2010-12-31
PCT/EP2011/074049 WO2012089707A2 (en) 2010-12-31 2011-12-26 An induction heating cooker

Publications (2)

Publication Number Publication Date
EP2659733A2 true EP2659733A2 (en) 2013-11-06
EP2659733B1 EP2659733B1 (en) 2017-04-05

Family

ID=45422157

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11802755.6A Not-in-force EP2659733B1 (en) 2010-12-31 2011-12-26 An induction heating cooker

Country Status (2)

Country Link
EP (1) EP2659733B1 (en)
WO (1) WO2012089707A2 (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2744299A1 (en) * 2012-12-11 2014-06-18 BSH Bosch und Siemens Hausgeräte GmbH Induction heating device for household appliances
GB2512042A (en) 2012-12-31 2014-09-24 Continental Automotive Systems Resistance determination with increased sensitivity for temperature control of heated automotive component
GB2512039A (en) 2012-12-31 2014-09-24 Continental Automotive Systems Using resistance equivalent to estimate temperature of a fuel-njector heater
GB2512041A (en) 2012-12-31 2014-09-24 Continental Automotive Systems Resistance determination for temperature control of heated automotive components
GB2512040A (en) 2012-12-31 2014-09-24 Continental Automotive Systems Using resistance equivalent to estimate heater temperature of an exhaust gas after-treatment component
CN105451384A (en) * 2014-07-31 2016-03-30 E.G.O.电气设备制造股份有限公司 Induction heating system
CN106136933B (en) * 2015-04-07 2018-09-11 佛山市顺德区美的电热电器制造有限公司 Cooking apparatus and electric heater unit for cooking apparatus
EP3836753B1 (en) * 2019-12-13 2023-09-06 Electrolux Appliances Aktiebolag Method and system to control a qr-inverter in a induction cooking appliance

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1981000801A1 (en) * 1979-09-17 1981-03-19 Matsushita Electric Ind Co Ltd Inductive heating equipment
DE3607125C1 (en) * 1986-03-05 1987-08-27 Aeg Elotherm Gmbh Power supply system for several parallel resonant circuits that can be connected in parallel to busbars and form a load
US6018154A (en) * 1996-03-13 2000-01-25 Matsushita Electric Industrial Co., Ltd. High-frequency inverter and induction cooking device using the same
FR2773014B1 (en) * 1997-12-23 2000-03-03 Europ Equip Menager DEVICE FOR SUPPLYING MULTIPLE RESONANT CIRCUITS BY AN INVERTER POWER GENERATOR

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2012089707A3 *

Also Published As

Publication number Publication date
EP2659733B1 (en) 2017-04-05
WO2012089707A2 (en) 2012-07-05
WO2012089707A3 (en) 2013-02-07

Similar Documents

Publication Publication Date Title
EP2659733B1 (en) An induction heating cooker
US20100006563A1 (en) Induction heating device and associated operating and saucepan detection method
JP2012532580A (en) Digitally controlled power converter for cookware
WO2013064331A1 (en) An induction heating cooker
ES2684618T3 (en) A power supply device for a household appliance and a method of operation thereof
WO2015059801A1 (en) Induction heating cooker
EP2774453B1 (en) An induction heating cooker
KR100629334B1 (en) Induction heating cooker to limit the power level when input voltage is low and its operating method therefor
EP3424269B1 (en) Induction heating cooker power control circuit
KR101119840B1 (en) Induction heating device
JP6038344B2 (en) Induction heating cooker
EP2774259B1 (en) An induction heating cooker
EP2939499B1 (en) An induction heating cooktop
RU2567853C2 (en) Induction heating device
JP5521597B2 (en) rice cooker
JP6931792B2 (en) Induction heating device and its drive control method
EP3637954B1 (en) Induction heating device having improved switch stress reduction structure
KR20210081053A (en) Induction heat cooking apparatus and the driving module thereof
EP2774260B9 (en) Induction heating cooker
KR20090005142U (en) Induction heating cooker
CN114688952B (en) Electromagnetic heating equipment, pot deviation detection method thereof and heating control system
CN214592051U (en) Control circuit of electromagnetic cooking appliance and electromagnetic cooking appliance
CN112584565B (en) Electromagnetic heating circuit heating treatment method, electromagnetic heating circuit and appliance
JP4494316B2 (en) Induction heating cooker
WO2017149055A1 (en) Induction heating cooker power control circuit

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20130726

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

DAX Request for extension of the european patent (deleted)
GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

INTG Intention to grant announced

Effective date: 20170105

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

REG Reference to a national code

Ref country code: CH

Ref legal event code: EP

REG Reference to a national code

Ref country code: AT

Ref legal event code: REF

Ref document number: 882903

Country of ref document: AT

Kind code of ref document: T

Effective date: 20170415

REG Reference to a national code

Ref country code: IE

Ref legal event code: FG4D

REG Reference to a national code

Ref country code: DE

Ref legal event code: R096

Ref document number: 602011036718

Country of ref document: DE

REG Reference to a national code

Ref country code: NL

Ref legal event code: MP

Effective date: 20170405

REG Reference to a national code

Ref country code: LT

Ref legal event code: MG4D

REG Reference to a national code

Ref country code: AT

Ref legal event code: MK05

Ref document number: 882903

Country of ref document: AT

Kind code of ref document: T

Effective date: 20170405

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170405

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: HR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170405

Ref country code: FI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170405

Ref country code: AT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170405

Ref country code: ES

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170405

Ref country code: GR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170706

Ref country code: LT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170405

Ref country code: NO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170705

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LV

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170405

Ref country code: PL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170405

Ref country code: SE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170405

Ref country code: BG

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170705

Ref country code: IS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170805

Ref country code: RS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170405

REG Reference to a national code

Ref country code: DE

Ref legal event code: R097

Ref document number: 602011036718

Country of ref document: DE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170405

Ref country code: RO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170405

Ref country code: CZ

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170405

Ref country code: EE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170405

Ref country code: SK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170405

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170405

Ref country code: SM

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170405

26N No opposition filed

Effective date: 20180108

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170405

REG Reference to a national code

Ref country code: DE

Ref legal event code: R119

Ref document number: 602011036718

Country of ref document: DE

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20171226

REG Reference to a national code

Ref country code: IE

Ref legal event code: MM4A

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20171226

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20171226

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

Effective date: 20180831

REG Reference to a national code

Ref country code: BE

Ref legal event code: MM

Effective date: 20171231

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20180102

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20180703

Ref country code: IE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20171226

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20171231

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20171226

Ref country code: BE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20171231

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20171231

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MC

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170405

Ref country code: HU

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT; INVALID AB INITIO

Effective date: 20111226

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: CY

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20170405

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170405

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: TR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170405

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: PT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170405

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: AL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170405