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EP0393506A2 - Electric cooker - Google Patents

Electric cooker Download PDF

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Publication number
EP0393506A2
EP0393506A2 EP90107003A EP90107003A EP0393506A2 EP 0393506 A2 EP0393506 A2 EP 0393506A2 EP 90107003 A EP90107003 A EP 90107003A EP 90107003 A EP90107003 A EP 90107003A EP 0393506 A2 EP0393506 A2 EP 0393506A2
Authority
EP
European Patent Office
Prior art keywords
control circuit
outputs
hot plates
heating power
clock frequency
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
EP90107003A
Other languages
German (de)
French (fr)
Other versions
EP0393506B1 (en
EP0393506A3 (en
Inventor
Alfred Meisner
Erwin Potthof
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.)
Diehl Verwaltungs Stiftung
Original Assignee
Diehl GmbH and Co
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 Diehl GmbH and Co filed Critical Diehl GmbH and Co
Publication of EP0393506A2 publication Critical patent/EP0393506A2/en
Publication of EP0393506A3 publication Critical patent/EP0393506A3/en
Application granted granted Critical
Publication of EP0393506B1 publication Critical patent/EP0393506B1/en
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

Definitions

  • the innovation relates to an electric cooker with several hot plates, at least one of which can be switched over to increased heating output, in particular with glass ceramic cooktops.
  • the energy supply to the hot plates of electric cookers is usually clocked, i. H. at intervals.
  • the hotplate is controlled with a constant clock frequency, whereby the pulse-pause ratio of each energy pulse is changed depending on the setting of the hotplate controller.
  • the pulse time is small within a pulse period, whereas the pulse pause is large, with large powers, however, the pulse time is long and the pulse pause is short.
  • the provisions of the VDE for the operation of such devices stipulate that the clock frequency with a power input of 2000 watts in the 220V network must not be greater than 0.04167 Hz, with even higher powers of e.g. B. 2500 watts even a maximum of 0.025 Hz.
  • the object of the innovation is therefore to design an electric cooker in such a way that it is operated at the maximum permissible frequency when supplying energy to the hot plates or the hob.
  • an electronic control circuit for controlling the hot plates is provided, the clock frequency of which can be switched to a lower value with higher heating power.
  • a so-called roasting stage can be switched on, in which a heating power of 2500 watts constant can be supplied.
  • the innovation proposes that a changeover switch be provided which serves to switch a hotplate to increased heating power and which at the same time switches the clock frequency to a lower value in the control circuit. This lower value is 0.025 Hz according to VDE regulations.
  • control circuit it is also possible for the control circuit to output different clock frequencies at its outputs for controlling the individual hot plates, depending on the heating power set. This makes it possible to work with a higher clock frequency in accordance with the values permitted by the VDE, even in the range below the maximum heating power of 2000 watts and the possible clock frequency of at most 0.04167 at lower heating powers. This gives a more even cooking.
  • the control circuit for the cooker is preferably designed as a microprocessor, which is also used for clock generation. In principle, however, in the sense of the innovation, it would also be possible to carry out the clock generation by means of a frequency divider with switchable outputs.
  • hotplates 2, 3, 4 and 5 are provided, which can be controlled by the hotplate controllers 6 - 9 in their heating power.
  • a switch 10 is used to switch the hotplate 2 to an increased heating power of 2500 watts.
  • the electrical control circuit is designated 11, which contains a microprocessor 12, at the control inputs of which both the changeover switch 10 and the hotplate controller 6 - 9 are located.
  • These hotplate controllers are shown schematically as switches that can be adjusted in several positions.
  • the control signals for controlling the hotplates are taken from the outputs of the microprocessor.
  • a relay 13 is represented as a representative of the other outputs, which controls the heating power for the hotplate 2 by controlling the clock signals of the microprocessor.
  • a frequency f1 for heating power up to 2000 watts or a frequency f2 for a heating power of 2500 watts is given.
  • constant frequencies f 1 can be emitted for the remaining hot plates, provided that these hot plates are to be operated in the usual way.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Resistance Heating (AREA)
  • Electric Stoves And Ranges (AREA)

Abstract

The innovation relates to an electric cooker with a number of cooking plates, at least one of which can be switched to an increased heating output. It is envisaged, by means of the innovation, to make the timing frequency for the timed heating output supply switchably dependent upon the set heating output values. <IMAGE>

Description

Die Neuerung bezieht sich auf einen elektrischen Kochherd mit mehreren Kochplatten, von denen zumindest eine auf erhöhte Heizleistung umschalt­bar ist, insbesondere mit Glaskeramikkochfeldern.The innovation relates to an electric cooker with several hot plates, at least one of which can be switched over to increased heating output, in particular with glass ceramic cooktops.

Die Energiezufuhr zu den Kochplatten elektrischer Kochherde erfolgt üblicherweise getaktet, d. h. intervallweise. Dabei wird die Kochplatte mit einer konstanten Taktfrequenz angesteuert, wobei das Impulspausen­verhältnis jedes Energieimpulses, abhängig von der Einstellung des Kochstellenreglers, verändert wird. Bei kleinen Leistungen ist inner­halb einer Impulsperiode die Impulszeit klein, hingegen die Impuls­pause groß, bei großen Leistungen dagegen die Impulszeit lang und die Impulspause kurz. Die Bestimmungen des VDE zum Betrieb derartiger Ge­räte schreiben zur Vermeidung zu starker Störungen im Netz und umlie­gender Funkempfangsanlagen vor, daß die Taktfrequenz bei einer zuge­führten Leistung von 2000 Watt im 220V-Netz nicht größer als 0,04167 Hz sein darf, bei noch höheren Leistungen von z. B. 2500 Watt sogar nur noch maximal 0,025 Hz.The energy supply to the hot plates of electric cookers is usually clocked, i. H. at intervals. The hotplate is controlled with a constant clock frequency, whereby the pulse-pause ratio of each energy pulse is changed depending on the setting of the hotplate controller. With small powers, the pulse time is small within a pulse period, whereas the pulse pause is large, with large powers, however, the pulse time is long and the pulse pause is short. To avoid excessive interference in the network and surrounding radio reception systems, the provisions of the VDE for the operation of such devices stipulate that the clock frequency with a power input of 2000 watts in the 220V network must not be greater than 0.04167 Hz, with even higher powers of e.g. B. 2500 watts even a maximum of 0.025 Hz.

Moderne Kochplatten, insbesondere aber Glaskeramikkochfelder haben eine geringe Wärmespeicherkapazität, dies bedeutet, daß die Kochplatte oder das Kochfeld die Taktung der Energiezufuhr noch auf das Kochgut überträgt. Eine derartige Auswirkung ist jedoch unerwünscht.Modern hot plates, but in particular glass ceramic cooktops, have a low heat storage capacity, which means that the hot plate or the cooktop still transfers the timing of the energy supply to the food to be cooked. However, such an impact is undesirable.

Aufgabe der Neuerung ist es deshalb einen elektrischen Kochherd in der Weise auszugestalten, daß er bei der Energiezufuhr für die Kochplatten oder das Kochfeld jeweils mit der höchstzulässigen Frequenz betrieben wird.The object of the innovation is therefore to design an electric cooker in such a way that it is operated at the maximum permissible frequency when supplying energy to the hot plates or the hob.

Zur Lösung dieser Aufgabe wird daher vorgeschlagen, daß eine elektro­nische Steuerschaltung für die Ansteuerung der Kochplatten vorgesehen ist, deren Taktfrequenz bei höherer Heizleistung auf einen niedrigeren Wert umschaltbar ist.To solve this problem, it is therefore proposed that an electronic control circuit for controlling the hot plates is provided, the clock frequency of which can be switched to a lower value with higher heating power.

Bei Kochfeldern ist heute vorgesehen, daß über den normalen Kochbetrieb hinaus, welcher mit maximal 2000 Watt Heizleistung durchgeführt wird, eine sogenannte Bräterstufe eingeschaltet werden kann, bei welcher eine Heizleistung von konstant 2500 Watt zugeführt werden kann. Für derartige Einrichtungen schlägt die Neuerung vor, daß ein Umschalter vorgesehen ist, der zur Umschaltung einer Kochplatte auf erhöhte Heizleistung dient und der gleichzeitig in der Steuerschaltung die Taktfrequenz auf einen niedrigeren Wert umschaltet. Dieser niedrigere Wert beträgt entsprechend den VDE-Bestimmungen 0,025 Hz.In the case of hobs, it is now provided that, in addition to normal cooking, which is carried out with a maximum heating power of 2000 watts, a so-called roasting stage can be switched on, in which a heating power of 2500 watts constant can be supplied. For such devices, the innovation proposes that a changeover switch be provided which serves to switch a hotplate to increased heating power and which at the same time switches the clock frequency to a lower value in the control circuit. This lower value is 0.025 Hz according to VDE regulations.

Im Sinne der Neuerung ist es weiterhin möglich, daß die Steuerschaltung an ihren Ausgängen zur Ansteuerung der einzelnen Kochplatten, abhängig von der eingestellten Heizleistung, unterschiedliche Taktfrequenzen ab­gibt. Damit ist es möglich, auch im Bereich unterhalb der maximalen Heiz­leistung von 2000 Watt und der dabei möglichen Taktfrequenz von höchstens 0,04167 bei niedrigeren Heizleistungen mit einer höheren Taktfrequenz entsprechend den vom VDE zugelassenen Werten zu arbeiten. Damit ist eine Vergleichmäßigung des Kochens gegeben.In terms of the innovation, it is also possible for the control circuit to output different clock frequencies at its outputs for controlling the individual hot plates, depending on the heating power set. This makes it possible to work with a higher clock frequency in accordance with the values permitted by the VDE, even in the range below the maximum heating power of 2000 watts and the possible clock frequency of at most 0.04167 at lower heating powers. This gives a more even cooking.

Die Steuerschaltung für den Kochherd, ist vorzugsweise als Mikroprozessor ausgebildet, welcher gleichzeitig auch zur Takterzeugung dient. Grund­sätzlich wäre es im Sinne der Neuerung jedoch auch möglich die Takter­zeugung durch einen Frequenzteiler mit umschaltbaren Ausgängen durchzu­führen.The control circuit for the cooker is preferably designed as a microprocessor, which is also used for clock generation. In principle, however, in the sense of the innovation, it would also be possible to carry out the clock generation by means of a frequency divider with switchable outputs.

Nachfolgend soll die Neuerung anhand der Zeichnung noch kurz erläutert werden.The innovation is to be briefly explained below using the drawing.

Es zeigen:

  • Figur 1 einen Elektroherd in perspektivischer Darstellung;
  • Figur 2 die elektrische Steuerschaltung in einem solchen Herd.
Show it:
  • Figure 1 shows an electric stove in perspective;
  • Figure 2 shows the electrical control circuit in such a stove.

In einem elektrischen Kochherd 1 sind 4 Kochplatten 2, 3, 4 und 5 vorgesehen, welche von Kochstellenreglern 6 - 9 in ihrer Heizleistung geregelt werden können. Ein Umschalter 10 dient zur Umschaltung der Kochplatte 2 auf eine erhöhte Heizleistung von 2500 Watt.In an electric cooker 1 4 hotplates 2, 3, 4 and 5 are provided, which can be controlled by the hotplate controllers 6 - 9 in their heating power. A switch 10 is used to switch the hotplate 2 to an increased heating power of 2500 watts.

In Figur 2 ist die elektrische Steuerschaltung mit 11 bezeichnet, welche einen Mikroprozessor 12 enthält, an dessen Steuereingängen so­wohl der Umschalter 10 als auch die Kochstellenregler 6 - 9 liegen. Diese Kochstellenregler sind schematisch als in mehrere Stellungen verstellbare Schalter dargestellt. An den Ausgängen des Mikropro­zessors werden die Steuersignale für die Ansteuerung der Kochplatten abgenommen. Am obersten Ausgang des Mikroprozessors 12 ist stellver­tretend für die anderen Ausgänge ein Relais 13 dargestellt, welches unter Ansteuerung der Taktsignale des Mikroprozessors die Heizleistung für die Kochplatte 2 steuert. An dem entsprechenden Ausgang des Mikro­prozessors wird entweder eine Frequenz f₁ für Heizleistungen bis 2000 Watt oder eine Frequenz f₂ für eine Heizleistung von 2500 Watt abgegeben. An den übrigen Ausgängen des Mikroprozessors können für die übrigen Kochplatten konstante Frequenzen f₁ abgegeben werden, so­weit diese Kochplatten in üblicher Weise betrieben werden sollen. Es ist jedoch auch möglich, im Bereich von Heizleistungen unter 2000 Watt die Taktfrequenz stufenweise zugeordnet den entsprechenden Heizlei­stungen zu erhöhen und jede Kochplatte individuell zur eingestellten Heizleistung mit unterschiedlicher Frequenz zu takten. Auf diese Weise erhält man innerhalb der vorgeschriebenen höchstzulässigen Taktfre­quenzen eine möglichst gleichmäßige Beheizung der Kochplatten.In FIG. 2, the electrical control circuit is designated 11, which contains a microprocessor 12, at the control inputs of which both the changeover switch 10 and the hotplate controller 6 - 9 are located. These hotplate controllers are shown schematically as switches that can be adjusted in several positions. The control signals for controlling the hotplates are taken from the outputs of the microprocessor. At the top output of the microprocessor 12, a relay 13 is represented as a representative of the other outputs, which controls the heating power for the hotplate 2 by controlling the clock signals of the microprocessor. At the corresponding output of the microprocessor either a frequency f₁ for heating power up to 2000 watts or a frequency f₂ for a heating power of 2500 watts is given. At the other outputs of the microprocessor, constant frequencies f 1 can be emitted for the remaining hot plates, provided that these hot plates are to be operated in the usual way. However, it is also possible to gradually increase the cycle frequency assigned to the corresponding heating outputs in the range of heating outputs below 2000 watts and to cycle each hotplate individually to the set heating output with a different frequency. In this way, the cooking plates are heated as evenly as possible within the prescribed maximum permissible clock frequencies.

Claims (4)

1. Elektrischer Kochherd mit mehreren Kochplatten, von denen zumindest eine auf erhöhte Heizleistung umschaltbar ist, insbesondere mit Glaskeramikkochfeldern,
dadurch gekennzeichnet,
daß eine elektronische Steuerschaltung (11) für die Ansteuerung der Kochplatten (2 - 5) vorgesehen ist, deren Taktfrequenz bei höheren Heizleistungen auf einen niedrigeren Wert umschaltbar ist.1. electric cooker with several hot plates, at least one of which can be switched over to increased heating output, in particular with glass ceramic cooktops,
characterized,
that an electronic control circuit (11) for controlling the hot plates (2 - 5) is provided, the clock frequency of which can be switched to a lower value at higher heating outputs. 2. Kochherd nach Anspruch 1,
dadurch gekennzeichnet,
daß ein Umschalter (10) vorgesehen ist, der zur Umschaltung einer Kochplatte (2) auf erhöhte Heizleistung dient und der gleichzeitig in der Steuerschaltung (11) die Taktfrequenz auf einen niedrigeren Wert umschaltet.2. Cooker according to claim 1,
characterized,
that a changeover switch (10) is provided which serves to switch a hotplate (2) to increased heating power and which at the same time switches the clock frequency to a lower value in the control circuit (11). 3. Kochherd nach Anspruch 1,
dadurch gekennzeichnet,
daß die Steuerschaltung an ihren Ausgängen zur Ansteuerung der einzelnen Kochplatten (2 - 5), abhängig von der eingestellten Heizleistung, unterschiedliche Taktfrequenzen abgibt.3. cooker according to claim 1,
characterized,
that the control circuit outputs at its outputs for controlling the individual hot plates (2-5), depending on the heating power set, different clock frequencies. 4. Kochherd nach Anspruch 1,
dadurch gekennzeichnet,
daß die Steuerschaltung einen Mikroprozessor (12) zur Taktfrequenz­erzeugung aufweist.4. cooker according to claim 1,
characterized,
that the control circuit has a microprocessor (12) for clock frequency generation.
EP90107003A 1989-04-21 1990-04-11 Electric cooker Expired - Lifetime EP0393506B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE8905047U DE8905047U1 (en) 1989-04-21 1989-04-21 Electric cooker
DE8905047U 1989-04-21

Publications (3)

Publication Number Publication Date
EP0393506A2 true EP0393506A2 (en) 1990-10-24
EP0393506A3 EP0393506A3 (en) 1992-02-26
EP0393506B1 EP0393506B1 (en) 1995-03-01

Family

ID=6838534

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90107003A Expired - Lifetime EP0393506B1 (en) 1989-04-21 1990-04-11 Electric cooker

Country Status (2)

Country Link
EP (1) EP0393506B1 (en)
DE (2) DE8905047U1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19941299A1 (en) * 1999-08-31 2001-03-01 Eckhard Wahl Controller for electric cooker plate heat regulation has electronic time switch combined with heat sensor, each plate having only two connections, electronic time switch element controls heat

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2340664A1 (en) * 1976-02-06 1977-09-02 Nippon Steel Corp HEATING PROCESS BY INDUCTION OF METAL MATERIALS
DE2705528A1 (en) * 1977-02-10 1978-08-24 Weiss Kg Alfons Electric cooker heating elements control circuit - has counter supplied with clock pulses and with output gated to switch
DE2731782A1 (en) * 1977-07-14 1979-01-25 Ego Regeltech CONTROL UNIT FOR ELECTRIC COOKING PLATES
GB2120471A (en) * 1979-02-01 1983-11-30 Gen Electric Power control for appliance using resistive heating elements

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2340664A1 (en) * 1976-02-06 1977-09-02 Nippon Steel Corp HEATING PROCESS BY INDUCTION OF METAL MATERIALS
DE2705528A1 (en) * 1977-02-10 1978-08-24 Weiss Kg Alfons Electric cooker heating elements control circuit - has counter supplied with clock pulses and with output gated to switch
DE2731782A1 (en) * 1977-07-14 1979-01-25 Ego Regeltech CONTROL UNIT FOR ELECTRIC COOKING PLATES
GB2120471A (en) * 1979-02-01 1983-11-30 Gen Electric Power control for appliance using resistive heating elements

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19941299A1 (en) * 1999-08-31 2001-03-01 Eckhard Wahl Controller for electric cooker plate heat regulation has electronic time switch combined with heat sensor, each plate having only two connections, electronic time switch element controls heat

Also Published As

Publication number Publication date
DE59008560D1 (en) 1995-04-06
EP0393506B1 (en) 1995-03-01
DE8905047U1 (en) 1990-08-23
EP0393506A3 (en) 1992-02-26

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