EP0352169A1 - Leistungssteuerungsgerät, insbesondere für Kochplatten oder dergleichen - Google Patents

Leistungssteuerungsgerät, insbesondere für Kochplatten oder dergleichen Download PDF

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Publication number
EP0352169A1
EP0352169A1 EP89401977A EP89401977A EP0352169A1 EP 0352169 A1 EP0352169 A1 EP 0352169A1 EP 89401977 A EP89401977 A EP 89401977A EP 89401977 A EP89401977 A EP 89401977A EP 0352169 A1 EP0352169 A1 EP 0352169A1
Authority
EP
European Patent Office
Prior art keywords
switch
load
closing
control device
triac
Prior art date
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.)
Granted
Application number
EP89401977A
Other languages
English (en)
French (fr)
Other versions
EP0352169B1 (de
Inventor
Pierre Scholtes
Michel Hoffmann
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.)
Scholtes Ste
Original Assignee
Scholtes Ste
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 Scholtes Ste filed Critical Scholtes Ste
Priority to AT89401977T priority Critical patent/ATE101780T1/de
Publication of EP0352169A1 publication Critical patent/EP0352169A1/de
Application granted granted Critical
Publication of EP0352169B1 publication Critical patent/EP0352169B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C15/00—Details
    • F24C15/10—Tops, e.g. hot plates; Rings
    • F24C15/102—Tops, e.g. hot plates; Rings electrically heated
    • F24C15/106—Tops, e.g. hot plates; Rings electrically heated electric circuits
    • 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
    • H05B3/00—Ohmic-resistance heating
    • H05B3/68—Heating arrangements specially adapted for cooking plates or analogous hot-plates
    • 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
    • H05B3/00—Ohmic-resistance heating
    • H05B3/68—Heating arrangements specially adapted for cooking plates or analogous hot-plates
    • H05B3/74—Non-metallic plates, e.g. vitroceramic, ceramic or glassceramic hobs, also including power or control circuits

Definitions

  • the present invention relates to a device for continuously varying the electric power supplied to any passive charge and applies more particularly although not exclusively to the heating of homes of a hob or stove, where these homes preferably use a lamp or several so-called halogen lamps as heating means.
  • Cooktops or other household appliances of the cooker type or the like in which the top consists of a plate of a given thickness of a ceramic glass material, have among their many advantages, in addition to that of very rapid provide the desired calorific power, the advantage of allowing the user a direct view of the filament of these fireplaces and consequently of authorizing their adjustment by simply varying the light intensity of the visible radiation emitted.
  • the variation of the electric power is carried out in two different ways.
  • the electrical supply of the homes is controlled by a cyclic switch or metering device which, in a determined and constant time interval, switches on the halogen lamps for a given period and switches them off for another, the sum of these two periods corresponding to the chosen time interval.
  • the latter is in particular fixed by a Standard and is substantially equal to 24 s. for a nominal power of around 2000 W.
  • the other conventional solution consists in using an electromechanical switch to power the halogen tubes of the baking oven, generally four in number, if necessary only two, by connecting them together, either in series and / or with a diode mounted on the supply from the network to allow only one or two half-waves of the current to pass, ie in parallel, with all the possible intermediate variants allowing in each case the obtaining of a determined unit power, supplied to each household between a minimum value and a maximum or nominal value.
  • FR-A-2 527 802 a device for controlling the heating of a load, more particularly constituted by a cooking plate comprising several hearths, this device involving an electronic switch of the triac type.
  • this device when the nominal power is reached, the triac is traversed by a high electric current which, without particular precautions, risks damaging it.
  • the present invention relates to a power variator device which avoids these drawbacks, by allowing, on the contrary, at the user's discretion, a continuous and precise adjustment of the power supplied from a zero value to the nominal power with a number of adjustment positions which can be limited or infinite, the variation offered from 0 to 100% can be linear or not, this thanks to the use of an electronic static switch of the triac type whose trigger voltage is adjusted in an adjustable manner by a potentiometer which thus plays on the opening angle of the switch, that is to say on the phase shift of a control signal determining the closing of the electrical supply circuit of the homes.
  • the invention also relates to an electronic variator device, arranged in such a way that it avoids overheating of the surrounding atmosphere even for operation at full power or in the vicinity thereof and also which is capable of achieving, during from the opening of the switch, the total galvanic isolation of the load from the mains voltage.
  • the first two switches are both open, ensuring complete galvanic isolation of the load from the network, which presents the advantage of particularly appreciable job security; in particular, in the event of accidental overvoltages, created by lightning or other external phenomena on the electrical power distribution line, the resistive drive and the triac assembly that it controls are permanently efficiently protected.
  • the closing of the third switch makes it possible to bypass the electronic assembly and to avoid parasitic heat dissipation, detrimental to the service life of the components used. .
  • the power variator device is provided for adjusting the electrical supply of cooking stoves made up, at least in part, by halogen lamps.
  • the load advantageously comprises a plurality of such halogen lamps arranged in parallel.
  • the load is mounted in series on the circuit with an electric filter, eliminating parasitic voltages, at high frequencies and comprising two inductors, provided in series respectively at each of the terminals of the network, the two inductors being joined in parallel by a capacity.
  • the electronic switch consists of a triac, the resistive variator possibly being a potentiometer with linear stroke or not.
  • this variator is constituted by a continuous potentiometer or even by a sequential potentiometer with n successive positions, joining in series n-1 resistors.
  • the potentiometer can be replaced by an interface controlled by a microprocessor which manages the phase shift of the control pulses.
  • the pulses supplied can be transmitted to the triac by an appropriate interface comprising means providing the galvanic isolation of the latter; such means may in particular consist of wound cores or optoelectronic semiconductor components.
  • the device comprises a support provided with tracks printed connections, making the electrical connections between the two network terminals and the coils of the filter chokes between which the rotary switch is arranged, the axis of which driving the resistive variator carried by the support, the Triac being mounted so separated on the chassis of the hob, preferably near a radiator element ensuring cooling.
  • the reference 1 schematically designates the domestic electrical supply network, usually supplying alternating current at 220 V at 50 periods.
  • the load 2 to be supplied consists of one or more cooking zones, preferably here of the type with halogen lamps mounted in parallel, the particular structure of these zones and the completion of their assembly being in themselves without affecting the provisions concerned. the present invention.
  • the charge is made up of four halogen fireplaces but in other variants could comprise only two, associated or not with fireplaces with more conventional resistances.
  • connection contacts are arranged, as will be seen later, to be operated simultaneously, in order to allow either to connect the load to the terminals of the network, or to separate it opposite. of these terminals, thus ensuring, due to their simultaneous opening, its galvanic isolation.
  • the power supplied from the network 1 to the load 2 is controlled, according to the invention, by means of an electronic static switch 4, the details of which will be specified later, this being controlled in particular at closing by means of a member 5, joined to the switch by a transmission member 6, forming an interface.
  • a filter 7 Between the switch 4 and the load 2 is also mounted a filter 7, intended to avoid disturbances of the network, in particular due to the high parasitic frequencies created by successive closings and openings of the switch at each alternation of the current 'food.
  • a third contact 8 is finally provided ensuring, under certain operating conditions specified below, the connection of an electrical shunt on the electronic switch 4 in order to avoid in particular parasitic and harmful heating thereof.
  • the diagram in Figure 2 diagrams the shape of the voltage and therefore of the effective power at the terminals of the load 2 from the power supply of the network 1.
  • the curve S illustrates the sinusoid representing the variation periodic of this voltage, this one, in each alternation increasing first for then decrease before canceling out and changing signs, the phase shift over a full period thus varying from 0 to 360 °.
  • the electronic switch mounted in series in the load circuit is designed so that it is normally open, closing only at a given instant, variable in time during the period considered, this switch opening on the contrary to the zero crossing of the sinusoid during the inversion of the voltage.
  • FIG. 3 illustrates in more detail the practical implementation of the load control circuit 2, joined to terminals 11 and 12 of the network 1. These are themselves joined to contact pads 13 and 14 of two electromechanical switches 15 and 16 which allow synchronous opening and / or closing of the circuit simultaneously, by establishing or on the contrary by opening the connection with two homologous studs 17 and 18.
  • the load 2 is moreover associated with the filter 7, here comprising a capacitor 19 mounted between the studs 17 and 18 and two identical inductance coils 22 and 23 provided in series with conductors 20 and 21 respectively joined together through contacts 15 and 16 at terminals 11 and 12 of the network.
  • a potentiometer 24 is successively mounted in parallel, the cursor 25 of which makes it possible to deliver a variable voltage, a resistor 26 and a circuit comprising a resistor 27 and two capacitors 28 and 29 to its output terminals.
  • voltage at the output is clipped by a double diode 30 and adjusted by a resistor 31 before being routed on the trigger of a triac assembly 32 constituting the electronic switch 4, the latter preferably being a triac whose others terminals are respectively connected to conductors 20 and 21.
  • the circuit In parallel on the triac 32, the circuit includes two other studs 33 and 34 between which is mounted a third switch 35 which, in the closed position, thus shunts the triac 32.
  • the circuit is also associated with a rotary switch 36 whose movable axis (not shown) can be brought, from an initial neutral position to a first pad 37 and then beyond it in successive stages continuously or in leaps to a terminal pad 38, the travel of the switch 36 between these pads can be stopped in as many positions 39 each corresponding to the establishment of a given electrical power at the terminals of the load 2
  • the potentiometer 24 may or may not be linear, or alternatively be constituted by a switch with n positions to which n-1 resistors are wired in such a way that, with each change of position, there corresponds a separate arrangement of these resistors and a voltage of variable output step by step.
  • the axis of the switch 36 comprises a connecting member 40 respectively with the switches 15, 16 and 35 on the one hand, with the potentiometer 24 on the other hand, so that, when it passes from the neutral position to the first pad 37, it ensures the simultaneous switching of the switches 15 and 16 while then closing the circuit.
  • the axis of the switch 36 drives the cursor 25 of the potentiometer 24, gradually increasing the voltage at the output of the latter on the trigger of the triac 32.
  • the axis of the switch reaches the terminal pad 38, it closes the third switch 35, the connection established between the two pads 33 and 34 bypassing the triac by reducing the residual current flowing through it to a minimum value.
  • the rotary switch 36 makes it possible to obtain, under these conditions, a continuous adjustment or not of the useful electric power on the load 2, the variation of the triac tripping voltage realizing on the sinusoid of the network (see Figure 2) the corresponding phase shift of the pulses, and therefore the desired power setting between two extreme values, respectively where the power is zero and where it reaches its nominal value.
  • the filter 7, consisting of the capacitor 19 and the two inductors 22 and 23, is provided, which, by filtering the parasitic frequencies in the range from 0.1 to 30 MHz, prevents referral to the network of these frequencies and the radio interference they would cause.
  • Another advantage of the device considered also consists in the implementation on the circuit of the load 2 of the two switches 15 and 16 which, by operating simultaneously and in parallel, establish or cut the electrical connection between the terminals 11 and 12 and the conductors 20 and 21.
  • the opening of these switches provides the galvanic isolation of the circuit from the network 1, thereby ensuring effective protection of the triac 32 and associated electronic components against overvoltages created by lightning or other transient phenomena on distribution lines.
  • Figure 4 is illustrated an embodiment of the control device according to the invention, in which the various components are put in place so that the assembly can have a relatively reduced thickness not exceeding 30, at most 45 mm , thus allowing it to be housed in a cooking hob of the kind commonly used to date on the market.
  • the device comprises a support plate 41 on one of the faces of which are arranged conductive tracks (not shown), preferably obtained by the conventional technique of printed circuits to ensure all the necessary electrical connections between the different components.
  • conductive tracks not shown
  • On each side of the support are thus mounted the inductance coils 22 and 23 of the filter protecting the electronic switch 4 by preventing the return on the network of high parasitic frequencies created by the successive openings and closings of this switch.
  • the switch 36 comprises a rotary axis 42 on which are in particular cam-shaped sectors 43 and 44 respectively, the first allowing the simultaneous closing of the electromechanical switches 15 and 16 by means of rocking contacts 45 and 46.
  • the second sector 44 acts similarly on a contact 47 for the closing of the third switch 35, the sectors 43 and 44 being angularly offset on the axis 42 so that the corresponding switches are controlled for rotations of the switch of approximately 15 and 270 °.
  • the triac 32 is preferably separated from the support 41 so as to be able to be mounted on the chassis, not shown, of the cooking plate, the latter being able advantageously to serve as a radiator to improve the cooling of the triac before the latter. is bypassed as a result of the closure of the third switch 35 when the power delivered to the load has reached its nominal value, the switch 36 then being brought to the terminal pad 38 ( Figure 2).
  • the device is also designed in such a way that the constraints which arise from the use of an electronic static switch are eliminated in a safe manner, in particular by avoiding rejection on the network of parasitic components of high frequencies and also the prejudicial heating. of the switch when the plate is operating at its maximum power.
  • control pulses of the electronic switch could be generated by a microprocessor or similar system and transmitted to the triac by an appropriate interface preferably comprising a galvanic isolation from the network, this isolation which can be achieved using wound toroids or even using optoelectronic semiconductor components.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Resistance Heating (AREA)
  • Secondary Cells (AREA)
  • Mounting, Exchange, And Manufacturing Of Dies (AREA)
  • General Induction Heating (AREA)
  • Electric Stoves And Ranges (AREA)
EP89401977A 1988-07-20 1989-07-10 Leistungssteuerungsgerät, insbesondere für Kochplatten oder dergleichen Expired - Lifetime EP0352169B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89401977T ATE101780T1 (de) 1988-07-20 1989-07-10 Leistungssteuerungsgeraet, insbesondere fuer kochplatten oder dergleichen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8809832 1988-07-20
FR8809832A FR2634614A1 (fr) 1988-07-20 1988-07-20 Dispositif de commande de puissance, notamment pour foyers de plaques de cuisson ou analogues

Publications (2)

Publication Number Publication Date
EP0352169A1 true EP0352169A1 (de) 1990-01-24
EP0352169B1 EP0352169B1 (de) 1994-02-16

Family

ID=9368612

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89401977A Expired - Lifetime EP0352169B1 (de) 1988-07-20 1989-07-10 Leistungssteuerungsgerät, insbesondere für Kochplatten oder dergleichen

Country Status (5)

Country Link
EP (1) EP0352169B1 (de)
AT (1) ATE101780T1 (de)
DE (1) DE68913092T2 (de)
ES (1) ES2049341T3 (de)
FR (1) FR2634614A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2884104A1 (fr) * 2005-03-29 2006-10-06 Pierre Dumas Reglage par commutateur

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2528090B1 (es) * 2013-08-02 2015-11-24 Eika, S.Coop. Método de control de un aparato de cocción y un aparato de cocción que lo implementa

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2400815A1 (fr) * 1977-07-14 1979-03-16 Ego Regeltech Dispositif de commande pour tables de cuisson electriques
FR2527802A1 (fr) * 1982-05-27 1983-12-02 Danfoss As Convertisseur incrementiel-numerique
FR2535569A1 (fr) * 1982-11-03 1984-05-04 Diehl Gmbh & Co Montage de commutation de l'alimentation en puissance de recepteurs electriques
EP0155546A2 (de) * 1984-03-05 1985-09-25 General Electric Company Kraftstrom-Regeleinrichtung für eine automatische Kochplatte
EP0188886A1 (de) * 1984-12-21 1986-07-30 Micropore International Limited Heizapparat
EP0223503A1 (de) * 1985-11-09 1987-05-27 THORN EMI Patents Limited Steuerungsschaltung für eine Heizeinheit

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2400815A1 (fr) * 1977-07-14 1979-03-16 Ego Regeltech Dispositif de commande pour tables de cuisson electriques
FR2527802A1 (fr) * 1982-05-27 1983-12-02 Danfoss As Convertisseur incrementiel-numerique
FR2535569A1 (fr) * 1982-11-03 1984-05-04 Diehl Gmbh & Co Montage de commutation de l'alimentation en puissance de recepteurs electriques
EP0155546A2 (de) * 1984-03-05 1985-09-25 General Electric Company Kraftstrom-Regeleinrichtung für eine automatische Kochplatte
EP0188886A1 (de) * 1984-12-21 1986-07-30 Micropore International Limited Heizapparat
EP0223503A1 (de) * 1985-11-09 1987-05-27 THORN EMI Patents Limited Steuerungsschaltung für eine Heizeinheit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2884104A1 (fr) * 2005-03-29 2006-10-06 Pierre Dumas Reglage par commutateur

Also Published As

Publication number Publication date
FR2634614A1 (fr) 1990-01-26
ATE101780T1 (de) 1994-03-15
ES2049341T3 (es) 1994-04-16
DE68913092D1 (de) 1994-03-24
EP0352169B1 (de) 1994-02-16
DE68913092T2 (de) 1994-06-09

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