WO2010069789A1 - Appareil ménager comprenant au moins un onduleur - Google Patents

Appareil ménager comprenant au moins un onduleur Download PDF

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Publication number
WO2010069789A1
WO2010069789A1 PCT/EP2009/066469 EP2009066469W WO2010069789A1 WO 2010069789 A1 WO2010069789 A1 WO 2010069789A1 EP 2009066469 W EP2009066469 W EP 2009066469W WO 2010069789 A1 WO2010069789 A1 WO 2010069789A1
Authority
WO
WIPO (PCT)
Prior art keywords
damping
domestic appliance
semiconductor switches
capacitors
appliance according
Prior art date
Application number
PCT/EP2009/066469
Other languages
German (de)
English (en)
Inventor
Ignacio Garde Aranda
Pablo Jesus Hernandez Blasco
Sergio Llorente Gil
Oscar Lucia Gil
Daniel Palacios Tomas
Ramon Peinado Adiego
Original Assignee
BSH Bosch und Siemens Hausgeräte GmbH
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 BSH Bosch und Siemens Hausgeräte GmbH filed Critical BSH Bosch und Siemens Hausgeräte GmbH
Priority to EP09796993.5A priority Critical patent/EP2380394B1/fr
Priority to ES09796993.5T priority patent/ES2586465T3/es
Publication of WO2010069789A1 publication Critical patent/WO2010069789A1/fr

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
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2213/00—Aspects relating both to resistive heating and to induction heating, covered by H05B3/00 and H05B6/00
    • H05B2213/03—Heating plates made out of a matrix of heating elements that can define heating areas adapted to cookware randomly placed on the heating plate

Definitions

  • the invention relates to a domestic appliance with at least one inverter according to the preamble of claim 1.
  • an induction hob with several inverters comprising two connected to one pole of a DC voltage source semiconductor switch. Parallel to each semiconductor switch, a damping capacitor is arranged, which prevents undesired ringing of a resonant resonant circuit comprising the inductors of the hob after switching operations of the semiconductor switches. The ringing leads to scattering losses, which can adversely affect the overall efficiency of the hob.
  • the snubber capacitor must be properly sized.
  • the dimensioning of the damping capacitor depends, in particular, on the expected power, which is transmitted via the semiconductor switches before or after the switching operations.
  • many similar inductors are flexibly grouped into heating zones which are formed depending on a position and / or size of a detected cookware element set up on the hob.
  • a desired heat output determined by a user selected power level is then fed to the various inducers of the heating zone.
  • An inverter can then supply one or more inductors with a suitable heating current.
  • the total power to be generated by an inverter is therefore much more dependent on the situation than in traditional induction hobs in which an inductor is always supplied by a single inverter.
  • the invention is in particular the object of providing a domestic appliance with an inverter that can be operated with a particularly high efficiency can.
  • the object is achieved by a domestic appliance having the features of the independent claim 1.
  • the invention is based, in particular, on a household appliance with at least one inverter which comprises at least two semiconductor switches connected to different poles of a DC voltage source.
  • Each of the semiconductor switches is associated with a damping arrangement which is arranged parallel to one of the semiconductor switches.
  • the poles of the DC voltage source may be a positive and a negative pole or a ground and a pole with a zero voltage value.
  • the DC voltage source may in particular comprise a rectifier for rectifying a mains voltage of a household power grid.
  • the term "damping constant" is intended to denote a complex-valued damping constant.
  • the damping arrangement may in particular comprise one or more capacitors and / or one or more resistors.
  • the damping arrangement comprises a damping capacitor system, wherein the means for adjusting a total capacity of the damping capacitor system is designed.
  • the damping capacitor system can either comprise a capacitor with an adjustable capacitance, for example a variable capacitor, or a plurality of capacitors which can be switched on and off.
  • a symmetrical damping of both semiconductor switches can be ensured if the means for simultaneous, in particular symmetrical changing the Damping constants of the damping arrangements of both semiconductor switches is designed.
  • the damping arrangement comprises a plurality of switching elements and a plurality of capacitors, each of which can be connected by closing a switching element.
  • capacitors have different capacitances and can be switched independently of one another, a particularly wide variety of possible values of the capacitances can be achieved by the choice of suitable combinations of capacitors.
  • the advantages of the invention in particular in connection with domestic appliances come to fruition, which are designed as induction hobs. Because of the widely varying loads, the inventive concept can be used particularly profitably in cooktops of the matrix type.
  • the domestic appliance comprises a control unit which adjusts the total capacity or damping constant as a function of a nominal power transmitted via the semiconductor switches.
  • Other parameters may be an amplitude of the AC voltage generated by the inverter, a dielectric loss angle of a consumer system powered by the inverter, and / or a total inductance of that system.
  • the attenuation constant may be changed in steps as the relevant parameters reach certain thresholds.
  • FIG. 2 shows a schematic representation of a circuit with an inverter and damping arrangements
  • FIG. 3 shows a circuit with an inverter and a damping arrangement according to an alternative embodiment of the invention
  • Fig. 1 shows an induction hob with a matrix of inductors 30 and a control unit 32 which can detect a cookware element 34 placed on the hob and determine the size and shape of the bottom of the cookware element 34 or several cookware elements.
  • the control unit 32 summarizes a plurality of inductors 30 to form a flexibly definable heating zone 36.
  • a user can set a power level for the heating zone 36 or for a plurality of heating zones 36.
  • the control unit 32 interconnects a plurality of inverters 10 of a power supply unit 40 with the inducers 30 of the heating zone 36 so that the inducers 30 of the heating zone 36 couple a total heating power dependent on the set power level into the cookware element 34.
  • the inverters 10 or an inverter 10 generate a high-frequency alternating current with a frequency in the order of magnitude of 50-100 kHz, which flows through the inductors 30 and generates a magnetic field which changes with the same frequency.
  • the magnetic field in turn, generates alternating currents in the ferromagnetic bottom of the cookware element 34, thereby heating that bottom.
  • the power supply unit 40 comprises a DC voltage source 12 which comprises a rectifier 42 and a filter circuit 44.
  • the rectifier 42 is connected to a phase of a household power network 46. Although only one power supply unit 40 is shown in FIG. 1, in practice the hob is fed by two power supply units which are connected to two phases of the household power network 46.
  • a likewise controlled by the control unit 32 circuitry 48 is provided, can be made and separated via the flexibly configurable connections between the inverters 10 and the inductors 30.
  • FIG. 2 shows a circuit with an inverter 10, which comprises two semiconductor switches 14, 16.
  • Each of the semiconductor switches 14, 16 consists of a transistor 50, in particular an insulated gate bipolar transistor (IGBT) and a diode 52.
  • IGBT insulated gate bipolar transistor
  • the inverter 10 with the two semiconductor switches 14, 16 is constructed in a half-bridge topology.
  • An upper contact point 54 is connected to a positive output of the DC voltage source 12, and a lower contact point 56 of the circuit is connected to the ground potential.
  • each of the damping assemblies 18, 20 includes two capacitors 28a, 28b. A first capacitor 28a is hardwired to the corresponding semiconductor switch 14, 16.
  • the two capacitors 28a of the upper and lower semiconductor switches 14, 16 are each connected to a center of the inverter 10, to which the inductor 30 is also connected.
  • Each of the damping arrangements 18, 20 additionally comprises a further capacitor 28b.
  • the two capacitors 28b are connected in common with an input of a switching element 26, which may be formed, for example, as an electromechanical relay. By closing the switching element 26, the two capacitors 28b can also be connected to the center of the inverter 10, so that the capacitors 28b are connected in parallel with the corresponding semiconductor switch 14, 16.
  • the switching element 26 therefore forms, in interaction with the capacitors 28a, 28b, a means 22 for varying a damping constant of the damping arrangements 18, 20.
  • By closing the switching element 26, the damping constants of both damping arrangements 18, 20 are changed simultaneously in the same way.
  • the capacitors 28a, 28b together form a flexibly configurable snubber capacitor system 24.
  • the control unit 32 (FIG. 1) can control the switching element 26 via a control line not shown here. In order to match the total capacitance of the damping assemblies 18, 20 to a load of the inductor 30, the control unit 32 closes the switching element 26 when a load of the inductor or a power transmitted through the semiconductor switches 14, 16 exceeds a threshold.
  • FIGS. 3 and 4 show alternative embodiments of the invention. The following description is essentially limited to differences from the embodiment of the invention shown in FIGS. 1 and 2 in order to avoid repetition. With regard to consistent features, reference is made to the description of FIGS. 1 and 2.
  • FIG. 3 shows a circuit with three pairs of capacitors 28a, 28b, 28c, wherein in each case a part of the pair is assigned to one of the semiconductor switches 14, 16 or one of the damping arrangements 18, 20.
  • the capacitors 28a are hardwired to the semiconductor switches 14, 16, and the capacitors 28b and 28c can each be switched on or off by switching elements 26a, 26b.
  • the control unit 32 can thereby choose between three possible values of the total capacitance of the damping arrangements 18, 20, between the capacitance of the capacitors 28a, between the sum of the capacitances of the capacitors 28a and 28b and between the sum of the capacitances of all three capacitors 28a, 28b, 28c.
  • the capacitances of the capacitors 28b and 28c have the same value, so that the total capacity of the damping capacitor system can be increased starting from a basic value in two stages with the same distance.
  • FIG. 4 shows a further alternative embodiment of the invention, in which switching elements 26a, 26b for connecting capacitors 28b, 28c of the damping capacitor system 24 are not connected in series one behind the other, as in the exemplary embodiment according to FIG. 3, but in parallel with the center of FIG Inverter 10 are connected.
  • the capacitors 28b, 28c preferably have different capacitances, so that a different total capacitance can be achieved by closing the switching element 26a when the switching element 26b is open than by closing the switching element 26b when the switching element 26a is open. Altogether four different values of the total capacity are adjustable.
  • the control unit 32 can prevent leakage during operation.
  • the total capacitance, and hence the attenuation constant, of the attenuator assemblies 18, 20 can be matched to the load, such that substantial ringing of the resonant circuits formed by the resonant capacitors 58 and the inductor 10 and discharge of oversized snubber capacitors of one attenuator assembly through the transistor 50 of another Semiconductor circuit can be avoided. At the same time too great inertia of the circuit can be avoided by an over-dimensioned at low power attenuation capacitor.
  • Fig. 5 shows power losses in an exemplary embodiment.
  • the power losses are composed of line losses, which are represented by a horizontal hatching and switching losses, which are represented by a vertical hatching.
  • the left-hand column in FIG. 5 shows the losses at a comparatively high power with the switching element 26 open in the exemplary embodiment according to FIG. 2, and the right-hand column in FIG. 5 shows the losses at the same power with the switching element 26 closed and capacitors 28b connected. It can be seen that the switching losses can be significantly reduced.

Abstract

L'invention concerne un appareil ménager comprenant au moins un onduleur (10), lequel inclut au moins deux commutateurs à semiconducteur (14, 16) reliés par des pôles différents à une source de tension continue (12) et au moins deux arrangements atténuateurs (18, 20) qui sont respectivement disposés en parallèle avec l'un des commutateurs à semiconducteur (14, 16). Selon l'invention, pour réduire les pertes liées au courant de fuite résultant des opérations de permutation de l'onduleur (10), l'appareil ménager est équipé d'au moins un moyen (22) pour régler une constante d'atténuation d'au moins l'un des arrangements atténuateurs (18, 20).
PCT/EP2009/066469 2008-12-19 2009-12-07 Appareil ménager comprenant au moins un onduleur WO2010069789A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP09796993.5A EP2380394B1 (fr) 2008-12-19 2009-12-07 Plaque de cuisson à induction comprenant au moins un onduleur
ES09796993.5T ES2586465T3 (es) 2008-12-19 2009-12-07 Campo de cocción por inducción con al menos un inversor de potencia

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ES200803710A ES2354093B1 (es) 2008-12-19 2008-12-19 Aparato domestico con al menos un inversor.
ESP200803710 2008-12-19

Publications (1)

Publication Number Publication Date
WO2010069789A1 true WO2010069789A1 (fr) 2010-06-24

Family

ID=41683325

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2009/066469 WO2010069789A1 (fr) 2008-12-19 2009-12-07 Appareil ménager comprenant au moins un onduleur

Country Status (3)

Country Link
EP (1) EP2380394B1 (fr)
ES (2) ES2354093B1 (fr)
WO (1) WO2010069789A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2408863R1 (es) * 2011-10-26 2013-08-06 Bsh Electrodomesticos Espana Dispositivo de calentamiento por inducción dotado de elementos condensadores
WO2022233654A1 (fr) * 2021-05-03 2022-11-10 BSH Hausgeräte GmbH Dispositif d'alimentation en énergie par induction

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006114320A (ja) * 2004-10-14 2006-04-27 Mitsubishi Electric Corp 誘導加熱装置及び誘導加熱調理器
JP2007012490A (ja) * 2005-07-01 2007-01-18 Hitachi Appliances Inc 誘導加熱調理器
JP2007194006A (ja) * 2006-01-18 2007-08-02 Hitachi Appliances Inc 誘導加熱装置
JP2007335274A (ja) * 2006-06-16 2007-12-27 Mitsubishi Electric Corp 誘導加熱調理器
JP2008021469A (ja) * 2006-07-12 2008-01-31 Hitachi Appliances Inc 電磁誘導加熱装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006114320A (ja) * 2004-10-14 2006-04-27 Mitsubishi Electric Corp 誘導加熱装置及び誘導加熱調理器
JP2007012490A (ja) * 2005-07-01 2007-01-18 Hitachi Appliances Inc 誘導加熱調理器
JP2007194006A (ja) * 2006-01-18 2007-08-02 Hitachi Appliances Inc 誘導加熱装置
JP2007335274A (ja) * 2006-06-16 2007-12-27 Mitsubishi Electric Corp 誘導加熱調理器
JP2008021469A (ja) * 2006-07-12 2008-01-31 Hitachi Appliances Inc 電磁誘導加熱装置

Also Published As

Publication number Publication date
EP2380394B1 (fr) 2016-07-27
ES2354093B1 (es) 2012-01-26
ES2586465T3 (es) 2016-10-14
ES2354093A1 (es) 2011-03-10
EP2380394A1 (fr) 2011-10-26

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