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EP2200399A1 - Verfahren zur Stromversorgung mit der Leistung von mindestens einem Induktor und Kochgerät, bei dem dieses Verfahren umgesetzt ist - Google Patents

Verfahren zur Stromversorgung mit der Leistung von mindestens einem Induktor und Kochgerät, bei dem dieses Verfahren umgesetzt ist Download PDF

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Publication number
EP2200399A1
EP2200399A1 EP09290982A EP09290982A EP2200399A1 EP 2200399 A1 EP2200399 A1 EP 2200399A1 EP 09290982 A EP09290982 A EP 09290982A EP 09290982 A EP09290982 A EP 09290982A EP 2200399 A1 EP2200399 A1 EP 2200399A1
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EP
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Prior art keywords
power
inductor
power supply
inductors
value
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EP09290982A
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English (en)
French (fr)
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EP2200399B1 (de
Inventor
Etienne Alirol
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Groupe Brandt SAS
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FagorBrandt SAS
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Application filed by FagorBrandt SAS filed Critical FagorBrandt SAS
Priority to PL09290982T priority Critical patent/PL2200399T3/pl
Publication of EP2200399A1 publication Critical patent/EP2200399A1/de
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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

Definitions

  • the present invention relates to a power supply method of at least one inductor.
  • the present invention relates to the power supply of the inductors of a cooking appliance, and in particular of a domestic hob using induction heating.
  • the inductors are respectively powered by inverters controlled at a working frequency according to the set power assigned to each inductor.
  • the inductor When the working frequency of the inverter is equal to the resonant frequency of the resonant circuit formed by the inductor and a kitchen utensil placed thereon, the inductor generates in the kitchen utensil as much power as possible and when the inverter is controlled to move the operating frequency away from this resonant frequency, the power generated by the inductor decreases.
  • the power delivered by the inductor or the power output varies depending on the container to be heated disposed on the inductor (size of the container, material, position relative to the inductor).
  • the power delivered at the inductor is measured by measuring a mean current flowing in the resonant circuit formed by the inductor and the container and multiplying the value of the average current by the value of the supply voltage.
  • This restored power is compared to the requested power demand and the working frequency of the inverter is modified to approach by the value of the power restored by the inductor, the value of the nominal power.
  • the object of the present invention is to solve the aforementioned drawbacks and to propose a power supply method of at least one inductor making it possible to know the value of the power restored by this inductor without the measurement of a mean electric current flowing in this inductor.
  • the present invention thus aims in a first aspect a power supply method of at least one inductor associated with a container to be heated and powered by an inverter controlled by a frequency generator.
  • the feed method comprises a step of analyzing at least one inductor associated with the container to be heated, the analysis step being adapted to determine a function between the instantaneous power supplying the at least one inductor and the period of the chopper signal generated by the frequency generator controlling said at least one inverter, said analyzing step comprising measurements implemented for a sample of target power values allocated to said at least one inductor.
  • said analysis phase is implemented before a power supply step of said at least one inductor to a selected target power value.
  • the analysis step is carried out regularly during power supply of said at least one inductor to a selected target power value.
  • the sample of target power values comprises at least a minimum reference power value corresponding to a minimum continuous power value admitted by the inductor and a maximum target power value corresponding to a maximum power value. continuous admitted by the inductor.
  • the sample further comprises at least one intermediate setpoint power value between the minimum setpoint power value and the maximum setpoint power value.
  • the measurements implemented for a sample of target power values are adapted to define an affine function connecting the instantaneous power supplying said at least one inductor and the switching period generated by the frequency generator controlling said at least one inverter.
  • the supply method comprises the analysis step implemented on the inductors associated respectively with containers to be heated, and comprises a phase of supply in parallel of the two inductors, in which the two inductors are fed respectively by the two inverters controlled at the same working frequency, the working frequency being determined from the functions determined during the analysis step, between the switching period generated by the frequency generator commander the two inverters and the instantaneous power supplying each inductor, the sum of the instantaneous powers supplying each inductor during the parallel supply phase being equal to the maximum power supplied by the power phase of the power supply.
  • inductors By mounting the inductors in parallel on the same power phase of a power supply and by supplying these inductors with inverters controlled at the same working frequency by means of a single frequency generator, the generation of interference between neighboring inductors, which can create audible and annoying noises for the user.
  • the power supply method comprises only a phase of alternating power supply of the two inductors.
  • the present invention relates to an electric cooking appliance, and in particular an induction hob, comprising at least two cooking hobs respectively comprising two inductors connected in parallel on the same power phase of a power supply and fed respectively by two inverters.
  • the electric cooking appliance comprises a processing unit adapted to control the inverters at the same operating frequency and to implement the power supply method of the two inductors according to the present invention.
  • This electric cooking appliance has characteristics and advantages similar to those described above in relation to the power supply method used.
  • the electric cooking appliance is an induction cooktop 10 comprising four cooking hobs F1, F2, F3, F4.
  • Each cooking zone F1, F2, F3, F4 respectively comprises an inductor mounted on a power phase of a power supply 11, typically a mains power supply.
  • the hob is powered by 32 amps that can provide a maximum power of 7200 W at the hob 10, a power of 3600 W per phase.
  • each inductor of the firing heaters F1, F2, F3, F4 can in practice be made from one or more coils in which the electric current flows.
  • a control and power control card 12 makes it possible to support all the electronic and computer means necessary for controlling the hob 10.
  • the cooking hobs can also be identified by screen printing vis-à-vis the inductors placed under the cooking surface.
  • the hob 10 also comprises control and interface means 14 with the user, in particular enabling the user to control in power and in duration the operation of each focus F1, F2, F3, F4.
  • This cooktop has similar features and the same numerical references as the cooktop shown in figure 1 .
  • the embodiment of the figure 2 has only three foci, F1 foci, F2 identical to those previously described, and a larger F5 dual focus.
  • This double F5 fireplace is usually made of a central inductor and an annular inductor.
  • the central inductor is operated in isolation when a small container is placed on the F5 and the two inductors are operated simultaneously with larger containers.
  • the inductors of each home are mounted in pairs in parallel on the same power phase of the power supply.
  • the inductors associated with the first two foci F1, F2 are connected in parallel with a first power phase of the power supply, and the inductors associated with the other two foci F3, F4 are connected in parallel with the second power phase of the power supply. power supply.
  • figure 2 the inductors associated with the first two foci F1, F2 are connected in parallel on a first phase of the power supply, and the concentric inductors associated with the focal point F5 are connected in parallel with a second power phase of the power supply.
  • these two inductors I1, I2 are connected in parallel on a power phase of the power supply and controlled respectively by two inverters 31, 32.
  • Each inductor I1, I2 is connected in parallel with a capacitor C1, C2.
  • the inductor I1, I2 and the capacitor C1, C2 then form a resonant circuit whose resonant frequency varies as a function of the receptacle disposed above the inductor I1, I2.
  • Each inverter 31, 32 can operate from any electronic switching means, and for example, from a voltage-controlled transistor type switch, known as IGBT (acronym for the term “ Insulated Gate Bipolar Transistor "). ). This switch is associated with a freewheeling diode.
  • IGBT Insulated Gate Bipolar Transistor
  • Such an inverter is conventionally used in an induction cooktop and need not be described in more detail here.
  • each inverter 31, 32 is controlled at a frequency F T1 , F T2 .
  • This frequency control is managed by a processing unit 33.
  • This processing unit 33 is adapted to control a frequency generator 34.
  • the processing unit 33 is adapted to control the frequency F T1 , F T2 at which the transistors of the inverters 31, 32 are conductive or lock.
  • measuring means 35, 36 respectively adapted to measure the current flowing between each inverter 31, 32 and the associated inductors I1, I2.
  • These measuring means 35, 36 make it possible in particular to measure the peak current Imax1, Imax2 and the switched current Icom1, Icom2 at the output of each inverter 31, 32.
  • the peak current Imax is deduced from the instantaneous current flowing in each inverter 31, 32.
  • the switching current Icom current for which the switch or associated freewheeling diode becomes conductive, is also deduced from the instantaneous current measured at the output of the inverter.
  • the power supply method of the inductor I is used to heat a container placed on this inductor I to a desired power Pd requested by the user.
  • the power supply method comprises a step E41 of container detection placed vis-à-vis the inductor I.
  • this container detection can be implemented from the analysis by the processing unit 33 of a current flowing in the inductor I.
  • a test step E42 makes it possible to determine the presence or absence of a container.
  • an incrementing step E43 of a counter and comparing E44 of the value of the counter with a limit value VI makes it possible, in a conventional manner, to repeat the steps of detecting the container E41 and the test E42 after the flow. a predetermined period of time.
  • the power supply method comprises a step of analyzing the inductor I associated with the container to be heated to determine a function connecting the instantaneous power. P supplying the inductor I and the period of the switching signal T generated by the frequency generator 34 controlling the inverters 31, 32.
  • This analysis step E45 is carried out before a power supply step E46 of the inductor I to the selected set power value Pd.
  • the power supply of the inductor I to a reference power Pd is implemented by determining the period of the switching signal T generated by the frequency generator 34 from the function connecting this period of the switching signal T to the instantaneous power P supplying the inductor I.
  • the analysis step E45 is carried out regularly during the power supply of the inductor I to the selected set power value Pd.
  • This periodic implementation of the analysis step E45 can be conveniently managed by a counter.
  • a test step E48 makes it possible to check whether the value of this counter has reached a second limit value VI 'or not.
  • the power supply method is adapted to implement an analysis step E45 every two minutes of operation of the inductor-container system.
  • the analysis step E45 is carried out periodically as a function of the cumulative operating time of the inductor-container system.
  • the analysis step E45 in the preceding example will be carried out periodically every 4 minutes.
  • the analysis step E45 first comprises a preliminary phase E45a in which the switching period T generated by the generator of frequency 34 controlling one of the inverters 31, 32 to supply the inductor I is gradually increased until the appearance of a switching current Icom across the inverter 31, 32.
  • This preliminary phase E45a aims to know the relationship between the value of the instantaneous power P supplying the inductor I and a measurement of the peak current Imax.
  • This solution has the advantage of allowing thereafter, by a measurement of the peak current Imax flowing in each inverter 31, 32, to deduce the instantaneous power P supplying the inductor I.
  • this preliminary phase E45a could be eliminated as soon as the processing unit 33 is adapted to know the value of the instantaneous power P supplying the inductor I from any other type of conventional measuring means.
  • the containers that can be used vary in terms of materials (aluminum, enamelled sheet, variable type stainless steel, cast iron, aluminum combined with stainless steel sheet).
  • the dimensions of the usable containers may also be variable, and for example for cylindrical containers, be between 12 and 24 cm in diameter.
  • the analysis step E45 comprises an analysis phase E45b adapted to determine a function between the instantaneous power P supplying the inductor I and the switching period T generated by the frequency generator 34. .
  • the analysis phase E45b for determining the curve connecting the instantaneous power P supplying the inductor-container system to the switching period T makes it possible to anticipate the behavior of this inductor-container system as a function of the switching period T applied to the inverters. 31, 32.
  • the supply method firstly comprises an analysis phase of the inductor-container system for nominal power values comprising at least a minimum reference power value Pmin corresponding to a minimum continuous power value PminCont accepted by the controller. inductor I and a maximum target power value Pmax corresponding to a maximum continuous power value PmaxCont accepted by the inductor I.
  • the minimum continuous power allowed PminCont on each inductor I depends in particular on the inverter 31, 32 supplying this inductor I, and in particular the operation of the IGBT switch, that is to say, its switching possibilities.
  • the permissible minimum continuous power value PminCont may be between 600 and 1800 W depending on the operating temperature, the type of container and its size, and the size of the inductor.
  • the value of the minimum reference power Pmin is set to a standard minimum continuous power value admitted PminCont, here equal to 1400 W.
  • a test step E52 is adapted to check if the minimum reference power Pmin is reached.
  • a delay step E53 is implemented to wait for a new sector period to achieve the servocontrol by the processing unit 33 at the working frequency F T1 , F T2 controlling the inverter 31, 32 supplying the inductor I.
  • the mains period corresponds to the periodicity of the alternating current supplying the electric cooking apparatus.
  • the value of the instantaneous power P supplying the inductor-container system is measured by virtue of the value of the peak current Imax flowing in the inductor I.
  • a test step E54 is adapted to check whether the switching current Icom is still present at the inverter 31, supplying the inductor I .
  • a setting step E55 is adapted to decrease the minimum setpoint power value Pmin and steps E52 to E54 are repeated.
  • the value minimum setpoint power Pmin is equal to the minimum allowable continuous power value PminCont below which the inductor-container system can not operate.
  • a storage step E56 is then adapted to store the torque of the minimum reference power Pmin associated with the period of the switching signal Tmin.
  • a second sampling step E57 is carried out for a maximum target power value Pmax corresponding to the maximum continuous power value admitted PmaxCont by the inductor I.
  • This permissible maximum continuous power PmaxCont also depends on the components of the inverters 31, 32, and in particular the IGBT switch.
  • this maximum continuous power admitted PmaxCont may be of the order of 2300 W.
  • a delay step E58 is implemented to wait for a new mains period to implement the servocontrol at the level of the processing unit 33 at the maximum setpoint power Pmax.
  • a test step E59 is adapted to verify that the period of the switching signal T applied to the inverter 31, 32 is well below a maximum value Tdmax.
  • the period of the switching signal T must be in a range of predetermined periods, between Tdmin and Tdmax.
  • the minimum period Tdmin may be substantially equal to 1/38 kHz and the maximum period Tdmax may be substantially equal to 1/28 kHz.
  • a safety step E60 is implemented, in particular to verify that the maximum permissible values on the peak current Imax are not reached.
  • a storage step E62 is adapted to store the maximum setpoint power Pmax and the period of the associated switching signal Tmax.
  • a comparison step E63 makes it possible to check whether the maximum power value Pmax and the minimum power value Pmin determined previously are close to each other.
  • the difference Pmax-Pmin is compared with a threshold value X, for example equal to 200 W.
  • the container associated with the inductor I has a low instantaneous power dynamic P and the analysis step E45b is complete.
  • the function connecting the instantaneous power P supplying the inductor I and the period of the clipping signal T generated by the frequency generator 34 controlling the inverter 31, 32 is here, by way of nonlimiting example, an affine function, represented by a straight line.
  • this analysis step E45 further comprises measurements implemented for a sample of nominal power values. comprising, in addition to the minimum setpoint power value Pmin and the maximum target power value Pmax, at least one intermediate setpoint power value between the minimum setpoint power value Pmin and the maximum setpoint power value Pmax.
  • a calculation step E65 makes it possible to determine two intermediate setpoint power values Pi1, Pi2.
  • Any method of determining such a straight line, and for example linear regression, can be applied.
  • a sampling step E66 makes it possible to set the target power value to a first intermediate command power value Pi1.
  • a timing step E67 is adapted to wait for a new mains period to implement the servocontrol at the level of the control of the inverter 31, 32.
  • a test step E68 is adapted as previously to check if the intermediate setpoint power value Pi1 is reached.
  • a storage step E69 is adapted to memorize the instantaneous power pair Pi1 and the period of the associated switching signal Ti1.
  • a sampling period E70 then makes it possible to set the value of the reference power to the second intermediate control power value Pi2, analogous timing steps E71 and of test E72 being implemented in a similar manner to the timer steps E67. and E68 test.
  • a storage step E73 is adapted to memorize the power pair Pi2 and the period of the associated clipping signal Ti2.
  • the analysis step E45 is carried out independently on the different inductor-container systems when a container is detected vis-à-vis an inductor I of the electric cooking apparatus.
  • the feed method described above can be adapted to power two power P1d, P2d two inductors I1, I2 connected in parallel on the same power phase and powered by the two inverters 31, 32 controlled by the generator of frequency 34.
  • An analysis step E45 is then carried out on the two inductor systems I1, I2 associated respectively with containers to be heated.
  • the analysis step E45 makes it possible to determine whether two inductor-receptacle systems admit operation in parallel, that is to say if it is possible to control at the same working frequency F T , and therefore to a same period of the switching signal T equal to T p , two inverters 31, 32 so as to obtain in parallel two instantaneous powers P1 p, P2p included in the operating range of each inductor-container system.
  • the maximum power values Pmax and minimum Pmin are very close to each other, that is to say that the curve shown in the figure 6 is a straight segment of very small dimensions, or even reduced to a point, the operation of this system in parallel with another inductor-container system will not be possible.
  • the working frequency F T is determined from the functions determined during the analysis step E45 described above, connecting the period of the switching signal T p generated by the frequency generator 34 controlling the two inverters 31, 32 and the instantaneous power P1p, P2p supplying each inductor I1, I2, the sum of the instantaneous powers P1p, P2p supplying each inductor I1, I2 during the parallel being equal to the maximum power provided by the power phase of the power supply.
  • the total power consumed is controlled by the power supplied by the mains supply, and for example, is equal to 3600 W.
  • each power P1p and P2p is not necessarily equal although the working frequency F T of the inverters 31, 32, corresponding to a period of the switching signal T p , is identical.
  • the period of the switching signal T p is then compared during parallel operation to the minimum value Tmin allowed for the period of the switching signal T and to the maximum value T max allowed for the period of the switching signal T.
  • the parallel mode can not be implemented and, alternately, a power supply phase. of the two inductors I1, I2 is implemented.
  • the instantaneous power P1p is determined for the two inductors I1, I2.
  • P ⁇ 2 ⁇ p AT ⁇ 2 ⁇ T p + B ⁇ 2.
  • the program period Tprog is a succession of sector periods.
  • the electrical standard EN-61000-3-3 (Flicker standard) fixes for the power supply network a maximum number of variations of the voltage per minute according to the amplitude of this variation.
  • the number of sector periods that make up the Tprog program period is determined according to the power difference existing over the Tprog program period, which must remain in compliance with the Flicker standard.
  • Tprog program period long enough, for example equal to fifteen seconds, likely to be suitable for a large power deviation of the order of 1800 Watts.
  • the average power P1 m, P2m restored during the program period Tprog by the inductors I1, I2 associated respectively with containers to be heated is determined by multiplying the duration Np of the parallel supply phase by the value of the instantaneous powers P1p, P2p .
  • the duration Np of the parallel supply phase is determined so that the average powers P1m, P2m delivered by the inductors I1, I2 are close to the values of reference powers P1d, P2d respectively associated with the two inductors I1, I2 and requested. by the user.
  • a parallel supply phase can not be implemented for a container R2 (white square curve) and a container R6 (black diamond curve).
  • At least one of the instantaneous powers P1p, P2p may be outside the limits of authorized powers, for example between 1400 and 2300 Watts.
  • This type of container can be powered at low power.
  • the present invention thus makes it possible to characterize an inductor-container system and to know the instantaneous power P supplying this system as a function of the period of the switching signal controlling the associated inverter.
  • control structure comprising a single IGBT switch
  • it can also be implemented on a half-bridge feed structure or a complete bridge assembly of the inductors.
  • the function connecting the instantaneous power P and the period of the switching signal T may be arbitrary, the invention not being limited to an affine function.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Inverter Devices (AREA)
  • General Induction Heating (AREA)
  • Electric Stoves And Ranges (AREA)
  • Control Of High-Frequency Heating Circuits (AREA)
EP09290982A 2008-12-22 2009-12-21 Verfahren zur Stromversorgung mit der Leistung von mindestens einem Induktor und Kochgerät, bei dem dieses Verfahren umgesetzt ist Revoked EP2200399B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL09290982T PL2200399T3 (pl) 2008-12-22 2009-12-21 Sposób zasilania mocą co najmniej jednego induktora oraz urządzenie do gotowania realizujące wspomniany sposób

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0858976 2008-12-22

Publications (2)

Publication Number Publication Date
EP2200399A1 true EP2200399A1 (de) 2010-06-23
EP2200399B1 EP2200399B1 (de) 2011-08-10

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EP09290982A Revoked EP2200399B1 (de) 2008-12-22 2009-12-21 Verfahren zur Stromversorgung mit der Leistung von mindestens einem Induktor und Kochgerät, bei dem dieses Verfahren umgesetzt ist

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EP (1) EP2200399B1 (de)
AT (1) ATE520280T1 (de)
ES (1) ES2370297T3 (de)
PL (1) PL2200399T3 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2400528R1 (es) * 2011-03-10 2013-05-21 Bsh Electrodomesticos Espana Soporte de circuito para un aparato de placa de cocción por inducción y dicho aparato.

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0286044A2 (de) * 1987-04-10 1988-10-12 Thomson Electromenager S.A. Schaltung zur Stromversorgung einer induktiven Kochstelle
WO2006117182A1 (de) * 2005-05-04 2006-11-09 E.G.O. Elektro-Gerätebau GmbH Verfahren und anordnung zur leistungsversorgung mehrerer induktionsspulen bei einem induktionsgerät
EP1951003A1 (de) * 2007-01-23 2008-07-30 Whirlpool Corporation Verfahren zur Regelung eines Induktionskochfeldes und zur Ausführung dieses Verfahrens adaptiertes Induktionskochfeld

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0286044A2 (de) * 1987-04-10 1988-10-12 Thomson Electromenager S.A. Schaltung zur Stromversorgung einer induktiven Kochstelle
WO2006117182A1 (de) * 2005-05-04 2006-11-09 E.G.O. Elektro-Gerätebau GmbH Verfahren und anordnung zur leistungsversorgung mehrerer induktionsspulen bei einem induktionsgerät
EP1951003A1 (de) * 2007-01-23 2008-07-30 Whirlpool Corporation Verfahren zur Regelung eines Induktionskochfeldes und zur Ausführung dieses Verfahrens adaptiertes Induktionskochfeld

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2400528R1 (es) * 2011-03-10 2013-05-21 Bsh Electrodomesticos Espana Soporte de circuito para un aparato de placa de cocción por inducción y dicho aparato.
EP2498576B1 (de) 2011-03-10 2017-08-02 BSH Hausgeräte GmbH Schaltungsträger für ein Induktionskochfeld, auf welchem Elektronikkomponenten angeordnet sind, sowie Induktionskochfeld mit einem Schaltungsträger

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Publication number Publication date
EP2200399B1 (de) 2011-08-10
ES2370297T3 (es) 2011-12-14
PL2200399T3 (pl) 2012-01-31
ATE520280T1 (de) 2011-08-15

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