EP3424269B1 - Circuit de commande de puissance de cuisinière à induction - Google Patents

Circuit de commande de puissance de cuisinière à induction Download PDF

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Publication number
EP3424269B1
EP3424269B1 EP17708509.9A EP17708509A EP3424269B1 EP 3424269 B1 EP3424269 B1 EP 3424269B1 EP 17708509 A EP17708509 A EP 17708509A EP 3424269 B1 EP3424269 B1 EP 3424269B1
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EP
European Patent Office
Prior art keywords
induction coil
control circuit
power control
vessel
microcontroller
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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.)
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EP17708509.9A
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German (de)
English (en)
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EP3424269A1 (fr
Inventor
Metin OZTURK
Atakan SARIOGLU
Ulas OKTAY
Sercan SINIRLIOGLU
Bekir DUMLU
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Arcelik AS
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Arcelik AS
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Publication of EP3424269A1 publication Critical patent/EP3424269A1/fr
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/06—Control, e.g. of temperature, of power
    • H05B6/062—Control, e.g. of temperature, of power for cooking plates or the like
    • 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
    • H05B2213/05—Heating plates with pan detection means

Definitions

  • Using a vessel produced from a metal that is not ferromagnetic or the absence of the vessel on the induction heating cooker may cause damage in terms of the power control circuit. If vessels with a small diameter or kitchen utensils such as forks, spoons, etc. are placed on the induction heating cooker, the system is required to quickly detect that "no appropriate vessel is present" and to cut the current passing through the induction coil. If the situation that there is no vessel suitable for induction heating is not quickly detected, problems in terms of user safety may arise.
  • the European Patent No. EP1542508 relates to the determination of the location of the cooking utensils on the induction cooking hob.
  • the European Patent No. EP2177076 relates to the method for operation an induction heating cooker the cooking surface of which is covered with induction coils.
  • the induction heating cooker power control circuit realized in order to attain the aim of the present invention, explicated in the first claim and the respective claims thereof, comprises an electronic oscillator, preferably a Colpitts oscillator, that is connected to the microcontroller, that transmits signals by electrically connecting to the induction coil at the beginning of the operation when the induction coil has not been energized, yet, before the user sets the power and that produces sinusoidal output voltage according to the serial resistance and inductor values of the induction coil - vessel pair.
  • the microcontroller detects whether there is a vessel on the induction coil and if there is, whether the ferromagnetic characteristics thereof are suitable.
  • the power control circuit furthermore comprises at least one oscillator switch that provides the activation of the Colpitts oscillator by connecting to the induction coil and the deactivation thereof by cutting the connection thereof with the induction coil.
  • the Colpitts oscillator is electrically connected to the induction coil and transmits signals to the induction coil for the detection of the vessel.
  • the oscillator switch cuts the connection of the Colpitts oscillator with the induction coil and enables the induction coil to be connected to the power control circuit.
  • the power control circuit furthermore comprises a peak voltage monitoring circuit that enables the peak voltage values of the sinusoidal current generated in the Colpitts oscillator to be read by the microcontroller, and a zero crossing monitoring circuit that converts the sinusoidal current generated in the Colpitts oscillator into square wave form and enables the amplitude of the signal to be read by the microcontroller.
  • the power control circuit of the present invention comprising the Colpitts oscillator
  • the presence of the vessel is detected before energizing the induction coil, thus decreasing the energy consumption and preventing the power switches from being damaged from high current.
  • noises that may disturb the user during the detection of the vessel are eliminated.
  • Figure 1 - is the schematic view of the induction heating cooker power control circuit
  • the power control circuit (1) (also referred to as the inverter circuit) that is suitable to be used in induction heating cookers and that provides the generation of magnetic energy for heating a vessel (14) placed onto the induction heating cooker surface, comprises a filter circuit (not shown in the figures) that filters the AC mains current; a bridge rectifier (2) that converts the alternative current received from the mains into direct current; a filter inductor (3) and a filter capacitor (4) that are disposed at the outlet of the bridge rectifier (2) on the DC line; an induction coil (5) that is energized for heating the vessel (14) placed onto the induction heating cooker so that the coil current passes therethrough; at least one resonant capacitor (6) that energizes the induction coil (5); at least one power switch (7), for example an IGBT (Insulated Gate Bipolar Transistor) that enables the resonant capacitor (6) to be charged/discharged and that provides the transmission of power from the induction coil (5) to the vessel (14); a drive circuit (8) that enables
  • the induction heating cooker is operated by means of an on-off button (not shown in the figures) and first electronic components such as the microcontroller (9) and the user interface (not shown in the figures) are activated, the induction coil (5) is not energized at the beginning. Afterwards, in order to heat the vessel (14) at the desired power setting, the heating setting is selected by the user and the induction coil (5) is energized.
  • the electronic oscillator (10) is a Colpitts oscillator that generates a current in sinusoidal wave form.
  • the electronic oscillator (10) enables the detection of whether the vessel (14) is present on the induction heating cooker surface before the induction coil (5) is energized.
  • the electronic oscillator (10) generates signals in form of a sinusoidal voltage with low amplitude such as 3 - 3.5 V by means of a low voltage generator (not shown in the figures), and applies the said signals to the induction coil (5).
  • the induction coil (5) - vessel (14) pair is modeled as serial resistance and inductor (R, L) and the said resistance (R) and inductance (L) values vary depending on the presence of absence of the vessel (14) and on the type of the vessel (14).
  • the inductor (L) value In case of the absence of the vessel (14), the inductor (L) value is high and the resistance (R) value is low. In case of the presence of the ferromagnetic vessel (14) suitable for induction heating, the inductor (L) value is low and the resistance (R) value is high. If a vessel (14) produced from aluminum, Teflon, copper, etc. not suitable for induction cooking is placed, both the resistance (R) and the inductor (L) values are low.
  • the electronic oscillator (10) applies the sinusoidal input voltage (current) to the induction coil (5) whereto the oscillator (10) is electrically connected at the beginning of the operation.
  • the power control circuit (1) comprises at least one oscillator switch (11) that is controlled by the microcontroller (9), that provides the activation of the electronic oscillator (10) by connecting to the induction coil (5) when the induction coil (5) is energized and the deactivation of the electronic oscillator (10) by cutting the connection thereof when the induction coil (5) is energized.
  • the oscillator switch (11) cuts the connection between the induction coil (5) and the power control circuit (1) when the power switches (7) are non-conducting and the induction coil (5) is not energized.
  • the oscillator switch (11) provides the electrical connection between the electronic oscillator (10) and the induction coil (5) when the induction coil (5) is not energized and the electronic oscillator (10) transmits signals to the induction coil (5) for detecting the vessel (14).
  • the oscillator switch (11) enable the induction coil (5) to be connected to the power control circuit (1) while providing the deactivation of the electronic oscillator (10).
  • the power control circuit (1) comprises a peak voltage monitoring circuit (12) that enables the microcontroller (9) to read the peak voltage values of the sinusoidal current generated in the electronic oscillator (10) according to the status of the induction coil (5) - vessel (14) pair.
  • the power control circuit (1) comprises a zero crossing monitoring circuit (13) that converts the sinusoidal current generated in the electronic oscillator (10) to square wave form according to the status of the induction coil (5) - vessel (14) pair and enables the signal amplitude to be read by the microcontroller (9).
  • the microcontroller (9) detects whether the vessel (14) is on the induction coil (5) and if the vessel (14) is thereon, whether the ferromagnetic characteristics thereof are suitable.
  • the power control circuit (1) is a half bridge series resonant (HBSR) circuit comprising a pair of resonant capacitors (6) and a pair of power switches (7).
  • HBSR half bridge series resonant
  • the power control circuit (1) of the present invention comprising the electronic oscillator (10) is used, at the beginning of the operation when only the microcontroller (9) and the user interface are activated and before the induction coil (5) is not energized, the presence and absence of the vessel (14), and, if the vessel (4) is present, whether the ferromagnetic characteristics thereof are suitable is detected.
  • the energy consumption is reduced and the power switches (7) energizing the induction coil (5) are prevented from being damaged from high current and generation of noise that may disturb the user during the detection of the vessel (14) is eliminated.

Claims (8)

  1. Un circuit de commande et de puissance (1) qui peut être utilisé dans les cuisinières à chauffage par induction, comprenant un pont redresseur (2) qui convertit le courant alternatif reçu par le secteur en courant continu; un inducteur de filtre (3) et un condensateur de filtrage (4) qui est disposé à la sortie du pont redresseur (2) ; une bobine d'induction (5) qui est alimentée pour chauffer un récipient (14) placé sur la cuisinière à chauffage par induction de sorte que le courant de la bobine passe à travers celui-ci; au moins un condensateur résonnant (6) qui alimente la bobine d'induction (5); au moins un interrupteur d'alimentation (7) qui permet de charger/décharger le condensateur résonnant (6) et qui assure la transmission de la puissance de la bobine d'induction (5) au récipient (14) ; un circuit de commande (8) qui permet de commander l'interrupteur d'alimentation (7) avec une tension de commande au seuil souhaité, et un microcontrôleur (9) qui régule le fonctionnement de l'interrupteur d'alimentation (7) au moyen du circuit de commande (8) caractérisé par
    - un oscillateur électronique (10) qui est connecté au microcontrôleur (9), qui transmet les signaux en se connectant électriquement à la bobine d'induction (5) au début du fonctionnement de la cuisinière à chauffage par induction lorsque la bobine d'induction (5) n'a pas encore été alimenté et qui produit une tension de sortie en accord avec les valeurs de résistance en série et d'inductance (R, L) de la paire bobine d'induction (5) - récipient (14), et
    - le microcontrôleur (9) qui, en fonction des données reçues de l'oscillateur électronique (10), détecte s'il y a un récipient (14) sur la bobine d'induction (5) et si les caractéristiques ferromagnétiques de celui-ci sont appropriées lorsqu'il y a un récipient (14),
  2. Un circuit de commande et de puissance (1) selon la Revendication 1, caractérisé par l'oscillateur électronique (10) qui est un «oscillateur Colpitts » qui génère le courant sous forme d'onde sinusoïdale.
  3. Un circuit de commande et de puissance (1) selon la Revendication 1 ou 2, caractérisé par au moins un interrupteur d'oscillateur (11) qui est contrôlé par le microcontrôleur (9), qui assure l'activation de l'oscillateur électronique (10) en se connectant à la bobine d'induction (5) lorsque la bobine d'induction (5) est alimentée et la désactivation de l'oscillateur électronique (10) en coupant la connexion de celui-ci lorsque la bobine d'induction (5) est alimentée.
  4. Un circuit de commande et de puissance (1) selon la Revendication 1 ou 2, caractérisé par un circuit de contrôle de tension de crête (12) qui permet au microcontrôleur (9) de lire les valeurs de tension de crête du courant sinusoïdal généré dans l'oscillateur électronique (10).
  5. Un circuit de commande et de puissance (1) selon la Revendication 1 ou 2, caractérisé par un circuit de contrôle de passage par zéro (13) qui convertit le courant sinusoïdal généré dans l'oscillateur électronique (10) en une forme d'onde carrée et qui permet à l'amplitude du signal d'être lue par le microcontrôleur (9).
  6. Un circuit de commande et de puissance (1) selon la Revendication 1 ou 2, caractérisé en ce que le circuit soit un circuit résonnant en série en demi-pont comprenant une paire de condensateurs résonnants (6) et une paire d'interrupteurs d'alimentation (7).
  7. Un circuit de commande et de puissance (1) selon la Revendication 1 ou 2, caractérisé en ce que le circuit soit un circuit quasi résonnant à interrupteur unique comprenant un seul condensateur résonnant (6) et un seul interrupteur d'alimentation (7).
  8. Une cuisinière à chauffage par induction (1), caractérisée par un circuit de commande et de puissance (1) selon la Revendication 1 ou 2.
EP17708509.9A 2016-03-04 2017-03-03 Circuit de commande de puissance de cuisinière à induction Active EP3424269B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
TR2016/02883A TR201602883A2 (tr) 2016-03-04 2016-03-04 İndüksi̇yon isiticili ocak güç kontrol devresi̇
PCT/EP2017/055015 WO2017149126A1 (fr) 2016-03-04 2017-03-03 Circuit de commande de puissance de cuisinière à induction

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EP3424269A1 EP3424269A1 (fr) 2019-01-09
EP3424269B1 true EP3424269B1 (fr) 2019-12-11

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EP17708509.9A Active EP3424269B1 (fr) 2016-03-04 2017-03-03 Circuit de commande de puissance de cuisinière à induction

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EP (1) EP3424269B1 (fr)
TR (1) TR201602883A2 (fr)
WO (1) WO2017149126A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111524491B (zh) * 2019-02-03 2021-05-25 京东方科技集团股份有限公司 调光玻璃的驱动电路及驱动方法、调光玻璃装置
US11678410B2 (en) * 2019-07-24 2023-06-13 Haier Us Appliance Solutions, Inc. Determining presence of compatible cookware in induction heating systems
CN112393280A (zh) * 2019-08-19 2021-02-23 广东美的白色家电技术创新中心有限公司 一种电磁灶台和电磁灶台的控制方法
CN112449451B (zh) * 2019-08-29 2023-03-21 台达电子工业股份有限公司 电磁炉与其操作方法

Family Cites Families (7)

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Publication number Priority date Publication date Assignee Title
IT1260456B (it) * 1992-01-28 1996-04-09 Whirlpool Italia Metodo e dispositivo per rilevare a presenza di un corpo per esempio una pentola su un piano di cottura in vetroceramica in corrispondenza di un elemento riscaldante associato a tale piano
IT1272028B (it) * 1993-03-15 1997-06-10 Whirlpool Italia Dispositivo per rilevare la presenza di un contenitore per alimenti, quale una pentola, una pirofila o similare, su un piano di cottura in vetroceramica.
DE60310774T2 (de) 2003-05-28 2007-07-12 Tubitak-Bilten (Turkiye Bilimsel Ve Teknik Arastirma Kurumu-Bilgi Teknolojileri Ve Elektronik Arastirma Enstitusu) Induktionskochfeld
EP1542508B2 (fr) 2003-12-08 2010-10-20 Whirlpool Corporation Dispositif pour déterminer la position d'un récipient de cuisson sur une plaque de cuisson
ES2324449B1 (es) 2007-07-31 2010-05-25 Bsh Electrodomesticos España, S.A Campo de coccion con una pluralidad de elementos de calentamiento y procedimiento para el accionamiento de un campo de coccion.
ES2356441B1 (es) * 2008-12-19 2012-03-13 Bsh Electrodomésticos España, S.A. Campo de cocción con un inductor, un inversor y un dispositivo de conexión.
ES2382767T3 (es) 2009-08-05 2012-06-13 Coprecitec, S.L. Procedimiento de control para un aparato de inducción, y aparato de inducción

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Publication number Publication date
WO2017149126A1 (fr) 2017-09-08
TR201602883A2 (tr) 2017-09-21
EP3424269A1 (fr) 2019-01-09

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