WO2014037898A1 - Procédure de chauffage par induction de cuisinières industrielles et ménagères avec optimisation de l'électricité fournie - Google Patents

Procédure de chauffage par induction de cuisinières industrielles et ménagères avec optimisation de l'électricité fournie Download PDF

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Publication number
WO2014037898A1
WO2014037898A1 PCT/IB2013/058316 IB2013058316W WO2014037898A1 WO 2014037898 A1 WO2014037898 A1 WO 2014037898A1 IB 2013058316 W IB2013058316 W IB 2013058316W WO 2014037898 A1 WO2014037898 A1 WO 2014037898A1
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WO
WIPO (PCT)
Prior art keywords
coil
container
circuit
electronic controller
resonance frequency
Prior art date
Application number
PCT/IB2013/058316
Other languages
English (en)
Inventor
Andrea Zuccatti
Original Assignee
Andrea Zuccatti
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 Andrea Zuccatti filed Critical Andrea Zuccatti
Publication of WO2014037898A1 publication Critical patent/WO2014037898A1/fr

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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

Definitions

  • the present invention relates to a procedure and a system for the induction heating of industrial and domestic cookers.
  • the present invention relates to a procedure and an induction heating system which makes it possible to identify the type and dimensions of the container or pan placed on top of an induction heating plate.
  • the invention then creates a mathematical model equivalent to the container or pan and on the basis of this supplies the optimum heating power suitably adapted to the type and dimensions of the container or pan used.
  • the invention can be applied in the sector for industrial electronics and in particular to the sector for induction heating systems for industrial and domestic cookers.
  • Induction heating systems are frequently used for the low and medium power systems applied to cookers for use in industry and the home. In general, these systems use resonant or semi-resonant converters on the power supply to the induction element.
  • the capacitance element is contained in the power converter.
  • the inductance element is contained in the inductor system and in the coupling that this produces in the pan.
  • the resistance element, net of the intrinsic ohmic circuit of the circuit, is mainly that obtained by the transfer of power to the material.
  • This series RLC equivalent model is excited by a bridge which is able to vary the amplitude of the power source applied by operating on the pulse-width modulation (P M) and at the same time varying the excitation frequency of the system.
  • P M pulse-width modulation
  • EP-A1-2334142 describes an induction heating device equipped with differential control means which supplies different currents depending on whether the container or pan to be heated is made from aluminium or steel. However this device is not equipped with means for detecting if the container or pan is made from aluminium or steel or any other material.
  • This invention overcomes the typical drawbacks and disadvantages of the prior art by providing a new induction heating procedure and system which is able to identify the material type of pan to be heated and to automatically adapt the heating performance to the optimum for the material identified and thereby optimise the use of the system and the running costs of the same.
  • claims 7 and 8 describe a heating system for application to industrial and domestic cookers which makes it possible to recognise the type of pan to be heated and optimise the supply of heating power to match the pan recognised.
  • the efficient transfer of power is obtained only in conditions where the working frequency used approximates to the resonance frequency of the LC circuit where, however, the inductance element L depends not only on the geometry of the heating coil but also on the shape, dimensions and material comprising the container or pan to be heated.
  • the present invention has been developed starting out primarily from the observation that the resonance frequency of the system at which the current (and therefore the power) delivered reaches its maximum peak depends on the shape, dimensions and material of the container or the pan to be heated.
  • the system control electronics when the container or - A - pan is placed on the heating plate the system control electronics performs a step-wise scanning of the working frequency of the machine between two preset limit values looking for the maximum peak and therefore the resonance frequency of the system.
  • the control electronics is able to identify, for each type of container placed on the plate, the system resonance frequency which corresponds to the point at which the plate delivers the maximum power to the container .
  • control electronics are programmed to fix the optimum working frequency at a value which is approximately 5% higher than the resonance frequency detected as being the maximum power supply peak for a specific type of container to be heated.
  • Figure 1 shows a circuit diagram of an induction heating system according to the present invention
  • FIG. 2 shows a circuit diagram of the equivalent electrical circuit used in the present invention.
  • FIG. 3 is a diagram showing the method for optimising performance according to the present invention.
  • the numeral 10 indicates in its entirety a class D inverter used in an induction heating system for application to industrial and domestic cookers .
  • the inverter 10 is powered by a suitable power supply connection 11 and is used to power an inductance element or coil 12 where a container or pan 13 to be heated can be placed.
  • the inverter 10 also comprises a pair of electronic switches 14, 14' which interrupt and/or allow the passage of current towards the coil 12 in accordance with the control instructions received from a microprocessor 17.
  • the system resonance frequency will vary by a factor Q (a factor indicating network losses) for the system. This can lead to a decay, in some cases quite substantial, in system performance and as a consequence can lead to high consumption levels.
  • the present invention is designed, when the pan 13 is placed on a coil 12, to perform a scan of the machine's working frequency in order to identify the power transfer maximum peak which corresponds to the system resonance frequency and the Q factor indicating the losses.
  • This operation is performed by a circuit 15, connected to the microprocessor 17 measuring the current running through the coil 12, and another circuit 16 also connected to the microprocessor 17 measuring the voltage at the terminals of the coil 12.
  • This operation also involves a voltage controlled oscillator (VCO) which outputs a variable frequency starting out from a variable input voltage.
  • VCO voltage controlled oscillator
  • the VCO circuit can be of the external type but preferably can be integrated directly into the microprocessor 17.
  • the system provided by the present invention performs a series of successive frequency measurements, at preset intervals, using the VCO (voltage controlled oscillator) circuit, in order to identify the resonance frequency of the system comprising that particular pan 13.
  • VCO voltage controlled oscillator
  • the frequency value which corresponds to the maximum current value flowing through the coil 12 is recorded and identified.
  • the optimum working frequency is set for that particular pan 13 at a value which is slightly higher, by approximately 5%, than the resonance frequency recorded. This value has been established by empirical testing as being the value which permits the best results in terms of the system heating performance .
  • FIG. 3 shows how the system electronics modifies the frequency by searching for the voltage pulse (Vpulse) whose presence indicates that the resonance frequency has been reached. At this point the system is calibrated so as to maintain the zero voltage switching (ZVS) condition and this optimises the energy performance of the electronics thereby reducing consumption.
  • Vpulse voltage pulse
  • ZVS zero voltage switching
  • the scanning frequency can be set, for example, starting from a value of 25 kHz and ranging up to a. value of 17 kHz, in steps of 100 Hz.
  • the maximum current value peak (or, in the equivalent mode, the power transferred to the pan 13) which corresponds to the system resonance frequency is identified and recorded within this range.
  • the system according to the present invention makes it possible to measure the active power supplied to the load (in other words, the kW transferred to the pan) . According to the invention it does this in real time by calculating the product of the instantaneous voltage applied to the RLC circuit and the circulating instantaneous current and then extracting, using a low-pass filter, the average content representing the effective power, measured in Watt, transferred to the pan 13.
  • the VCO (voltage controlled oscillator) circuit used for frequency scanning can be external or can be incorporated in the system containing the system control microprocessor. Inverter and power converters other than the types described above may also be used. The voltages, currents, frequencies and the related electrical powers used can vary widely depending on the type of application in which the system is used. Standard industrial applications use a 380-400V power supply rating while domestic applications customarily use a 220-230V power supply.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Induction Heating (AREA)
  • Inverter Devices (AREA)

Abstract

L'invention concerne une procédure de chauffage par induction de cuisinières industrielles et/ou ménagères, dans laquelle une bobine de chauffage (12) est alimentée par un convertisseur de puissance (10) connecté à une connexion d'alimentation électrique de réseau (11), dans laquelle le convertisseur de puissance (10) comprend une unité de commande électronique (17) appropriée qui fait passer un courant (ICOii) ayant une valeur prédéterminée à travers la bobine de chauffage (12) à une tension (V) prédéterminée, et dans laquelle un conteneur (13) à chauffer est placé au niveau de la bobine de chauffage (12). L'unité de commande électronique (17) commande un premier circuit (16) qui mesure la tension appliquée aux bornes de la bobine (12), et un second circuit (15) qui mesure le courant instantané traversant la bobine (12), caractérisée en ce que l'unité de commande électronique (17) commande également un circuit d'oscillateur commandé en tension (VCO) qui, une fois que le conteneur (13) à chauffer, qui présente une forme et une taille et comprend des matériaux constituants prédéterminés, a été disposé au niveau de la bobine (12), effectue un balayage successif des fréquences entre deux valeurs limites prédéterminées afin d'identifier la fréquence de résonance du système et donc la valeur de fréquence qui correspond à l'alimentation électrique optimale pour le conteneur (13).
PCT/IB2013/058316 2012-09-05 2013-09-05 Procédure de chauffage par induction de cuisinières industrielles et ménagères avec optimisation de l'électricité fournie WO2014037898A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITVR2012A000179 2012-09-05
IT000179A ITVR20120179A1 (it) 2012-09-05 2012-09-05 Procedimento di riscaldamento ad induzione per cucine ad uso industriale e domestico con ottimizzazione della potenza erogata

Publications (1)

Publication Number Publication Date
WO2014037898A1 true WO2014037898A1 (fr) 2014-03-13

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PCT/IB2013/058316 WO2014037898A1 (fr) 2012-09-05 2013-09-05 Procédure de chauffage par induction de cuisinières industrielles et ménagères avec optimisation de l'électricité fournie

Country Status (2)

Country Link
IT (1) ITVR20120179A1 (fr)
WO (1) WO2014037898A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109379795A (zh) * 2018-11-29 2019-02-22 洛阳升华感应加热股份有限公司 感应加热电源的逆变频率跟踪锁相控制系统
CN109769317A (zh) * 2019-02-18 2019-05-17 九阳股份有限公司 一种加热控制电路和具有其的电磁加热装置
JP2020096639A (ja) * 2014-05-21 2020-06-25 フィリップ・モーリス・プロダクツ・ソシエテ・アノニム 平面誘導コイルを備えるエアロゾル発生システム
EP3764740A1 (fr) * 2019-07-12 2021-01-13 Electrolux Appliances Aktiebolag Procédé de commande d'une plaque de cuisson à induction
GB2597762A (en) * 2020-08-04 2022-02-09 Njori Ltd Induction cooker

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5968398A (en) * 1997-05-16 1999-10-19 The Lepel Corporation Apparatus and method for non-contact detection and inductive heating of heat retentive food server warming plates
US20040228153A1 (en) * 2003-05-14 2004-11-18 Cao Xiao Hong Soft-switching techniques for power inverter legs
US20050127065A1 (en) * 2003-08-26 2005-06-16 General Electric Company Dual coil induction heating system
EP2334142A1 (fr) 2008-10-08 2011-06-15 Panasonic Corporation Dispositif de chauffage par induction
WO2012111244A1 (fr) * 2011-02-14 2012-08-23 三菱電機株式会社 Cuisinière à chauffage par induction

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5968398A (en) * 1997-05-16 1999-10-19 The Lepel Corporation Apparatus and method for non-contact detection and inductive heating of heat retentive food server warming plates
US20040228153A1 (en) * 2003-05-14 2004-11-18 Cao Xiao Hong Soft-switching techniques for power inverter legs
US20050127065A1 (en) * 2003-08-26 2005-06-16 General Electric Company Dual coil induction heating system
EP2334142A1 (fr) 2008-10-08 2011-06-15 Panasonic Corporation Dispositif de chauffage par induction
WO2012111244A1 (fr) * 2011-02-14 2012-08-23 三菱電機株式会社 Cuisinière à chauffage par induction

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2020096639A (ja) * 2014-05-21 2020-06-25 フィリップ・モーリス・プロダクツ・ソシエテ・アノニム 平面誘導コイルを備えるエアロゾル発生システム
CN109379795A (zh) * 2018-11-29 2019-02-22 洛阳升华感应加热股份有限公司 感应加热电源的逆变频率跟踪锁相控制系统
CN109379795B (zh) * 2018-11-29 2021-08-10 洛阳升华感应加热股份有限公司 感应加热电源的逆变频率跟踪锁相控制系统
CN109769317A (zh) * 2019-02-18 2019-05-17 九阳股份有限公司 一种加热控制电路和具有其的电磁加热装置
CN109769317B (zh) * 2019-02-18 2021-04-09 九阳股份有限公司 一种加热控制电路和具有其的电磁加热装置
EP3764740A1 (fr) * 2019-07-12 2021-01-13 Electrolux Appliances Aktiebolag Procédé de commande d'une plaque de cuisson à induction
WO2021008855A1 (fr) * 2019-07-12 2021-01-21 Electrolux Appliances Aktiebolag Procédé de commande d'une plaque de cuisson à induction
CN113924822A (zh) * 2019-07-12 2022-01-11 伊莱克斯家用电器股份公司 用于控制感应烹饪灶具的方法
CN113924822B (zh) * 2019-07-12 2024-04-26 伊莱克斯家用电器股份公司 用于控制感应烹饪灶具的方法
GB2597762A (en) * 2020-08-04 2022-02-09 Njori Ltd Induction cooker

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