EP2806328A1 - Kontrollsystem elektrischer Ladungen, das mindestens zwei Phasen eines elektrischen Verteilungsnetzes aufnimmt - Google Patents

Kontrollsystem elektrischer Ladungen, das mindestens zwei Phasen eines elektrischen Verteilungsnetzes aufnimmt Download PDF

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Publication number
EP2806328A1
EP2806328A1 EP14169171.7A EP14169171A EP2806328A1 EP 2806328 A1 EP2806328 A1 EP 2806328A1 EP 14169171 A EP14169171 A EP 14169171A EP 2806328 A1 EP2806328 A1 EP 2806328A1
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EP
European Patent Office
Prior art keywords
voltage
microcontroller
control system
charge control
supply voltage
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Granted
Application number
EP14169171.7A
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English (en)
French (fr)
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EP2806328B1 (de
Inventor
Cédric GOUMY
Etienne Alirol
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.)
Groupe Brandt SAS
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FagorBrandt SAS
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Publication of EP2806328A1 publication Critical patent/EP2806328A1/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
    • H05B6/065—Control, e.g. of temperature, of power for cooking plates or the like using coordinated control of multiple induction coils

Definitions

  • the present invention relates to an electrical charge control system powered by at least two phases of an electrical distribution network.
  • It also relates to an appliance with such a system for controlling electrical charges.
  • the voltage delivered by the electrical distribution network must be measured.
  • an electrical charge control system comprises a microcontroller configured to determine the powers to be delivered on the electrical charges.
  • an electronic system such as the electrical charge control system powered by at least two phases of an electrical distribution network
  • electronic circuits powered by different phases must be electrically isolated from each other.
  • each phase constitutes a supply voltage with respect to a reference potential.
  • the object of the present invention is to propose a system for controlling electrical charges, making it possible to reliably determine the power to be delivered to the electrical charges.
  • the present invention aims, in a first aspect, a system for controlling electrical charges receiving at least two phases of an electrical distribution network, each phase constituting a supply voltage with respect to a reference potential, the control system comprising a microcontroller, a reference potential associated with said microcontroller being different from at least one of the reference potentials associated with the phases.
  • control system comprises a device for measuring at least a first supply voltage with respect to a reference potential different from the reference potential associated with the microcontroller, the measurement device generating a representative output signal. at least said first supply voltage, the microcontroller being configured to determine the value of said first supply voltage at each instant as a function of said output signal.
  • the microcontroller determines supply voltage values that are not theoretical but real.
  • the power to be delivered to the electrical load is therefore reliably determined.
  • the electrical charge control system comprises, for each phase, power supply means comprising a voltage rectifier, the at least two power supply voltages constituting respectively the sinusoidal voltages of said at least two phases of the power supply network. electrical distribution after rectification, the period of the rectified sinusoidal voltages being predefined, and the measuring device measuring the rectified sinusoidal voltage corresponding to the first supply voltage at each predefined period.
  • the supply means comprise a full-wave voltage rectifier.
  • the voltage rectifier is a diode bridge.
  • the device for measuring a supply voltage comprises a resistive voltage divider bridge mounted across the supply means, a Zener diode connected in series with said voltage divider bridge and a transistor mounted across the terminals. a first resistor of said voltage divider bridge, galvanic isolation means disposed between said voltage divider bridge and the microcontroller and comprising an optocoupler mounted between said transistor and said microcontroller, said microcontroller being connected to the output of the optocoupler.
  • Zener diode connected in series with the voltage divider bridge, it is possible according to the value of the voltage present at the input of the voltage divider bridge to switch the transistor between a blocked state and a passing state so as to operate also switching the optocoupler.
  • the output signal of the measuring device is taken at the output of the optocoupler.
  • the detection of the on or off state of the transistor and the optocoupler by the microcontroller makes it possible to deduce the rms value of the supply voltage.
  • a galvanic isolation is provided between the microcontroller and the measuring device, these two elements receiving voltages referenced at different potentials.
  • the first resistor of the voltage divider bridge is mounted between the base and the emitter of said transistor, the collector of the transistor being connected in series with the emitter diode of the optocoupler.
  • the optocoupler comprises an emitter diode consisting of a light emitting diode and an output transistor.
  • a Zener diode is chosen such that the avalanche voltage of the Zener diode is less than Ueff x 2 , where Ueff is equal to the rms value of the supply voltage to be measured.
  • a Zener diode is thus chosen whose avalanche voltage satisfies this condition regardless of the fluctuations in the rms value of the supply voltage to be measured.
  • the output signal of the measuring device is the voltage detected by the microcontroller, this voltage being zero when the rectified sinusoidal voltage at the input of the voltage divider bridge is greater than the avalanche voltage of said Zener diode and being equal to a non-zero predetermined value when the rectified sinusoidal voltage at the input of said voltage divider bridge is less than the avalanche voltage of said Zener diode.
  • the microcontroller comprises means for calculating the effective value of the supply voltage to be measured from parameters of the output signal, these parameters being said predefined period and a time interval corresponding to the duration during which the rectified sinusoidal voltage at the input of said voltage divider bridge is greater than the avalanche voltage of the Zener diode during said predefined period.
  • the electrical charge control system further comprises a device for measuring the current associated with each load electrical being able to measure the current delivered to the associated electrical charge.
  • the electrical charge control system comprises a galvanic isolation device between the microcontroller and each electronic circuit connected to the microcontroller and powered by the first supply voltage.
  • the electrical charge control system further comprises a second device for measuring at least a second supply voltage with respect to a reference potential similar to the reference potential associated with the microcontroller.
  • the second measurement device can directly measure the supply voltage directly.
  • control system it is not necessary to equip the control system with a galvanic isolation between the microcontroller and the electronic circuits connected to the microcontroller powered by the second supply voltage. This allows for a less expensive electrical charge control system.
  • the present invention also relates to a household appliance receiving at least two phases of an electrical distribution network and comprising a set of electrical charges.
  • the appliance comprises an electrical charge control system according to the invention.
  • This appliance has similar characteristics and advantages to those described above in connection with the electrical charge control system.
  • the invention is particularly applicable to an induction hob comprising a set of inductors and an electrical charge control system according to the invention, the electrical charges being the inductors.
  • FIG. figure 1 An exemplary embodiment of the electric charge control system 30 according to the invention is shown in FIG. figure 1 .
  • the electrical charges C1 to C6 are for example inductors in an induction hob, but can be any type of load, for example radiant hobs or furnace resistors.
  • the electrical charge control system 30 receives two phases PH1, PH2 of an electrical distribution network.
  • Each phase PH1, PH2 constitutes respectively a supply voltage U1 (t), U2 (t) with respect to a reference potential UREF1, UREF2 respectively.
  • a first phase PH1 constitutes a first supply voltage U1 (t) with respect to a first reference potential UREF1 and a second phase PH2 constitutes a second supply voltage U2 (t) with respect to a second reference potential UREF2.
  • the electric charge control system 30 could receive a third phase constituting a third supply voltage with respect to a third reference potential.
  • the voltage of the electrical distribution network or mains voltage has for example a value of 230 VRMS (325V peak value) for the French power grid.
  • mains voltage may have different values, depending on the power grid of the country in which we are located.
  • the electrical charge control system comprises, for each phase, supply means 20A, 20B comprising a voltage rectifier 21A, 21B.
  • the power supply voltages U1 (t), U2 (t) are respectively the sinusoidal voltages of the two phases PH1, PH2 of the electrical distribution network after rectification.
  • the period T0 of the rectified sinusoidal voltages is thus predefined.
  • the voltage rectifiers 21A, 21B are full-wave voltage rectifiers.
  • the rectifier is implemented by a diode bridge or Gra ⁇ tz bridge.
  • control system 30 comprises a microcontroller 11 configured to manage the operation of the control system.
  • the microcontroller 11 receives voltages referenced to the second reference potential UREF2.
  • the control system 30 comprises a measuring device 10A of the first supply voltage U1 (t) with respect to the first reference potential UREF1, this first reference potential UREF1 being different from the reference potential associated with the microcontroller 11 (second potential UREF2).
  • the measuring device 10A measures the first rectified sinusoidal voltage U1 (t) corresponding to the first supply voltage at each predefined period T0.
  • This period T0 of the sinusoidal voltage to be measured U1 (t) is known and stored, for example, at the microcontroller 11.
  • the period T0 is equal to 10 ms.
  • the microcontroller 11 is configured to determine the value of the first supply voltage U1 (t) at each instant as a function of a signal output u1 (t) of the measuring device 10A. This will be described with reference to Figures 2 and 3 .
  • the electric charge control system 30 comprises electronic control circuits 31 each controlling an electric charge C1 to C6.
  • the electrical charge control system 30 further comprises a current measuring device 32 associated with each electric charge C1 to C6 which is able to measure the current delivered to the associated electrical load.
  • galvanic isolation devices 33 are arranged.
  • the galvanic isolation device 33 is integrated in the current measuring device.
  • the electrical charge control system 30 further comprises a second measuring device 10B of the second supply voltage U2 (t).
  • This second measuring device 10B comprises for example a resistive voltage divider bridge mounted across the supply means 20B, that is to say at the output of the rectifier 21 B.
  • the microcontroller 11 is mounted across one of the resistors of the voltage divider bridge and thus measures an instantaneous value representative of the supply voltage at the input of the voltage divider bridge.
  • the reference potential of the microcontroller 11 could be different from the first and second reference potentials UREF1, UREF2.
  • this supply voltage being here, the first supply voltage U1 (t) having as reference a first reference potential UREF1, this first reference potential UREF1 being different from reference potential associated with the microcontroller 11 (UREF2).
  • the measuring device 10A comprises a resistive voltage divider bridge composed here of two resistors R1, R2 connected in series across the supply means 20A of the electronic system.
  • a Zener diode D1 is connected in series with the voltage divider bridge R1, R2.
  • This Zener diode D1 is conventional and has an avalanche voltage Vz.
  • This avalanche voltage Vz is chosen so as to always be less than Ueff x 2 , where Ueff is equal to the rms value of the supply voltage to be measured U1 (t).
  • the avalanche voltage Vz must be less than 330V.
  • the Zener diode chosen has an avalanche voltage Vz of 200V.
  • a transistor T1 is mounted across a first resistor R1 of the voltage divider bridge R1, R2.
  • This transistor T1 may be a conventional transistor of the NPN type.
  • the first resistor R1 of the voltage divider bridge R1, R2 is connected between the base B and the emitter E of the transistor T1.
  • the collector C of the transistor T1 is connected in series with an emitting diode 12 of an optocoupler U1.
  • the optocoupler U1 may also be a standard optocoupler comprising the emitter diode 12, for example consisting of a light-emitting diode, and arranged opposite an output transistor 13.
  • This optocoupler U1 thus constitutes galvanic isolation means mounted between the transistor T1 and the microcontroller 11.
  • microcontroller 11 is mounted at the output of the output transistor 13 of the optocoupler U1.
  • the microcontroller 11 is connected across the first resistor R1 of the voltage divider bridge R1, R2 through the transistor T1 and the optocoupler U1.
  • An output signal u1 (t) of the measuring device is outputted from the optocoupler U1.
  • the microcontroller 11 thus receives as input the output signal u1 (t) of the measuring device 10A corresponding to the output voltage of the output transistor 13 of the optocoupler U1.
  • the output transistor 13 of the optocoupler U1 is biased by means of a resistor R4 connected to a DC voltage source prefixed, here equal to 5V.
  • the microcontroller 11 is adapted to detect an alternating logic level between 0 when the output transistor 13 is on and 1 when the output transistor 13 of the optocoupler U1 is off.
  • This diagram also shows the value of the avalanche voltage Vz of the Zener diode D1.
  • the lower part of the timing diagram illustrates the voltage u1 (t) detected by the microcontroller 11 at the terminals of the output transistor 13 of the optocoupler U1.
  • the transistor T1 is blocked so that the emitting diode 12 of the optocoupler U1 is also blocked.
  • the output transistor 13 of the optocoupler U1 is then also blocked, the voltage u1 (t) detected by the microcontroller 11 is equal to the DC voltage of 5V imposed by the bias resistor R4.
  • a non-zero current then flows in the resistive voltage divider bridge R1, R2.
  • the transistor T1 is then in an on state so that the emitting diode 12 of the optocoupler U1 is also on.
  • the output transistor 13 of the optocoupler U1 itself becomes in such a way that the voltage u1 (t) detected by the microcontroller 11 is equal to 0V.
  • the microcontroller 11 thus continuously monitors, over the predefined period T 0 of the sinusoidal supply voltage U 1 (t), the value of the voltage u 1 (t) at the output of the optocoupler U 1.
  • the microcontroller 11 can thus deduce the value of a time interval ⁇ t corresponding to the duration during which the voltage U1 (t) at the input of the voltage divider bridge R1, R2 is greater than the avalanche voltage Vz of the Zener diode D1 over the predefined period T0.
  • the microcontroller 11 measures the time interval ⁇ t between a falling edge (transition from logic state 1 to logic state 0) and a rising edge (transition from logic state 0 to logic state 1) of the voltage u1 (t) at the output of the optocoupler U1.
  • the supply voltage U1 (t) takes a value equal to the avalanche voltage Vz at two times t, t ', the time interval ⁇ t thus corresponding to t'-t.
  • the microcontroller 11 comprises means for calculating the effective value Ueff of the supply voltage U1 (t) from the predefined period T0 and of this time interval ⁇ t, this predefined period T0 and this time interval ⁇ t being output signal parameters u1 (t).
  • the measurement of the time interval ⁇ t by the microcontroller 11 makes it possible to know the value of the effective voltage Ueff of the supply voltage U1 (t).
  • the measurement device 10A described above thus makes it possible to measure the sinusoidal voltage of the electrical distribution network at any moment with galvanic isolation means U1 arranged between the voltage divider bridge R1, R2 and the microcontroller 11.
  • This voltage measuring device 10A can implement a standard optocoupler U1, and thus have a reduced cost.
  • the electrical charge control system 30 comprising this voltage measuring device 10A can be used in a domestic electrical appliance, and for example in an induction hob.
  • the induction hobs are connected to one or more phases of the electrical distribution network.
  • the use of a single microcontroller for measuring the voltage of at least two power supply phases requires the use of such a voltage measuring device.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Measurement Of Current Or Voltage (AREA)
EP14169171.7A 2013-05-23 2014-05-20 Kontrollsystem elektrischer Ladungen, das mindestens zwei Phasen eines elektrischen Verteilungsnetzes aufnimmt Active EP2806328B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1354629A FR3006121B1 (fr) 2013-05-23 2013-05-23 Systeme de controle de charges electriques recevant au moins deux phases d'un reseau de distribution electrique

Publications (2)

Publication Number Publication Date
EP2806328A1 true EP2806328A1 (de) 2014-11-26
EP2806328B1 EP2806328B1 (de) 2016-11-16

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EP14169171.7A Active EP2806328B1 (de) 2013-05-23 2014-05-20 Kontrollsystem elektrischer Ladungen, das mindestens zwei Phasen eines elektrischen Verteilungsnetzes aufnimmt

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EP (1) EP2806328B1 (de)
ES (1) ES2615889T3 (de)
FR (1) FR3006121B1 (de)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4599504A (en) * 1984-07-26 1986-07-08 Kabushiki Kaisha Toshiba Induction heating apparatus with protection against power interruption
EP2341757A1 (de) * 2009-12-31 2011-07-06 FagorBrandt SAS Verfahren und Vorrichtung zur Bestimmung der minimalen induzierten Dauerleistung, insbesondere eines Induktionskochgeräts
EP2386907A1 (de) * 2010-05-12 2011-11-16 Canon Kabushiki Kaisha Spannungsdetektionsvorrichtung und Bildwärmevorrichtung
EP2566036A2 (de) * 2011-08-30 2013-03-06 FagorBrandt SAS Verfahren und Vorrichtung zur Steuerung von zwei Leistungschaltern, insbesondere für ein Induktionskochgerät

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4599504A (en) * 1984-07-26 1986-07-08 Kabushiki Kaisha Toshiba Induction heating apparatus with protection against power interruption
EP2341757A1 (de) * 2009-12-31 2011-07-06 FagorBrandt SAS Verfahren und Vorrichtung zur Bestimmung der minimalen induzierten Dauerleistung, insbesondere eines Induktionskochgeräts
EP2386907A1 (de) * 2010-05-12 2011-11-16 Canon Kabushiki Kaisha Spannungsdetektionsvorrichtung und Bildwärmevorrichtung
EP2566036A2 (de) * 2011-08-30 2013-03-06 FagorBrandt SAS Verfahren und Vorrichtung zur Steuerung von zwei Leistungschaltern, insbesondere für ein Induktionskochgerät

Also Published As

Publication number Publication date
ES2615889T3 (es) 2017-06-08
FR3006121A1 (fr) 2014-11-28
EP2806328B1 (de) 2016-11-16
FR3006121B1 (fr) 2015-05-22

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