EP0286044A2 - Circuit for supplying power to an indution heating cooking apparatus - Google Patents

Circuit for supplying power to an indution heating cooking apparatus Download PDF

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Publication number
EP0286044A2
EP0286044A2 EP88105358A EP88105358A EP0286044A2 EP 0286044 A2 EP0286044 A2 EP 0286044A2 EP 88105358 A EP88105358 A EP 88105358A EP 88105358 A EP88105358 A EP 88105358A EP 0286044 A2 EP0286044 A2 EP 0286044A2
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EP
European Patent Office
Prior art keywords
relay
microprocessor
mains voltage
plate
circuit according
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
EP88105358A
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German (de)
French (fr)
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EP0286044B1 (en
EP0286044A3 (en
Inventor
Gerard Dr. Ing. Rilly
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Thomson Electromenager SA
Original Assignee
Deutsche Thomson Brandt GmbH
Thomson Electromenager SA
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Priority to AT88105358T priority Critical patent/ATE70399T1/en
Publication of EP0286044A2 publication Critical patent/EP0286044A2/en
Publication of EP0286044A3 publication Critical patent/EP0286044A3/en
Application granted granted Critical
Publication of EP0286044B1 publication Critical patent/EP0286044B1/en
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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

  • induction currents are generated with an induction coil located below the hotplate in the container made of ferromagnetic metal and containing the cooking material, which heats the container and thereby the cooking material contained therein.
  • the hot plates are supplied e.g. from a power source that supplies an alternating current with a peak / peak amplitude of approximately 18-45 A and a frequency between 25 and 40 kHz.
  • the power supplied to each plate is e.g. between 300 W and 3 kW.
  • the current source contains a so-called half-bridge with two power transistors connected in series, which are alternately controlled and blocked with alternating motions of the working frequency and supply the AC voltage for the heating coil at their connection point.
  • An operating voltage which is obtained by rectifying the AC line voltage, is applied to the transistors.
  • This operating voltage is not a pure DC voltage, but a pulsating DC voltage with a frequency of 100 Hz. This is due to the fact that the effort required for screening to a real DC voltage would be prohibitively high for the processed services.
  • the invention has for its object to reduce the disturbances mentioned when switching a power source between different hot plates. This object is achieved by the invention described in claim 1. Advantageous developments of the invention are described in the subclaims.
  • the microprocessor is controlled by the current source with a voltage which contains information about the respective zero crossing of the mains voltage.
  • the microprocessor contains the values for the pick-up time and the drop-out time of the relays causing the changeover.
  • the microprocessor controls the relays assigned to the two hotplates in such a way that in the region of the zero crossing of the mains voltage, one hotplate is first switched off and then the other hotplate is switched on.
  • the inevitable pick-up time and fall-off time of the relay is thus factored in by the microprocessor, such that despite these times and regardless of the respective operating frequency, the duration of the connection of the individual plates to the power source and the power supplied to one plate, the switching between the plates always in the area of the zero crossing of the mains voltage with a tolerance of approximately ⁇ 1-2 ms.
  • the current source in the vicinity of the zero crossing of the mains voltage is preferably switched off, so that the relay contacts are always switched in the de-energized state.
  • the network is practically not loaded during the high amplitudes, that is to say in the middle between two zeros, and therefore no significant disturbances occur due to the switchover to the network.
  • two hotplates P1, P2 are connected to the output of the current source G via two relays A and B.
  • This delivers an alternating current to the hot plates P1 and P2 with an amplitude peak / peak of 20 - 40 A, a frequency of 20 - 40 kHz and a power of 300 W - 3 kW.
  • the operating voltage Ua is applied to the current source G, which is a pulsating equilibrium voltage obtained at 100 Hz from the mains voltage.
  • the microprocessor M controls the relays A and B and the current source G and is also supplied by the current source G with the voltage Uo, which contains information about the respective zero crossing of the voltage Ua.
  • the switchover between the hotplates P1 and P2 will be described with reference to FIG. 2.
  • the relay A is attracted by the voltage Ua and the hotplate P1 to the current source G connected.
  • the relay B is not attracted by the voltage UB, so that the hotplate P2 is not connected to the current source G.
  • the voltage UA is switched off at t1.
  • relay A does not drop out due to the fall time.
  • the voltage UB appears from the microprocessor M, but because of the pickup time of the relay B there is initially no changeover.
  • the current source G is switched off by the processor M by the voltage Us. The current flowing into the plate P1 is therefore interrupted.
  • the hotplate P1 is switched off by opening the contacts of relay A.
  • t4 lies within the surrounding area T of the zero point at t5 in the voltage Ua.
  • relay B responds after the tightening time of t2 - t6 has elapsed. Its contact is closed and thus the plate P2 is switched on to the current source G.
  • the current source G is switched on again by the manipulated variable Us, so that the plate P2 is now fed. It is thus ensured that the switching of the current source G between the plates P1 and P2 always takes place in the surrounding area T of approximately ⁇ 1-2 ms of the zero point at t5 and also when the current source G is switched off.
  • FIG. 4 shows a solution for the switchover, in which lower values for Tu can be selected even with larger powers up to 3 kW than are given per se by the regulation according to FIG. 3.
  • the plate P1 is fed with the power NP1 of 3 kw.
  • the plate P2 is switched off. This temporary shutdown is used to control the average power consumed by plate P2.
  • the system switches back to plate P1. 3 therefore corresponds to t11 and t15.
  • the maximum power of 3 kW and the relatively short period Tu of 20 s can be used.
  • a shorter period of connection has the advantage that with a given heat inertia of the pot, a lower temperature drop between two heating processes and thus a more uniform heating over time can be achieved.
  • the invention has been described for switching between two plates P1, P2. 1, 2 can also be used for a larger number of plates, for example if the current source G is switched in succession to four different plates.
  • Microprocessor M Type 6805 Motorola Relay A
  • B Type ON-SH 112 DM Original Electric Manufacturing Co, Ltd
  • Tightening time from t2 - t6 5 ms
  • Fall time from t1 - t4 10 - 15 ms

Abstract

The current supply circuit uses a current source (G) supplied from the mains voltage (Ua) which is coupled to either or both of two inductive cooking plate (P1,P2) via respective relays (A,B). These are operated via a microprocessor (M) at the gas transition points of the mains voltage to prevent moustic noise. Pref. the opening of one relay and the closing of the other relay are effected within an interval of 1.2 M5 on either side of the zero transition point for the mains voltage. Alternate switching supplies both plates with a respective power lever under control of the microprocessor (M).

Description

Bei Kochstellen mit sogenannter induktiver Heizung werden mit einer unterhalb der Kochplatte befindlichen Induktions­spule in dem das Kochgut enthaltenden, aus ferromagnetischen Metall bestehenden Behälter Induktionsströme erzeugt, die den Behälter und dadurch das darin befindliche Kochgut erwär­mt. Diese Lösung hat den Vorteil, daß die bei bisherigen Her­den vorhandenen, mit Heizspiralen geheizten Kochplatten ent­fallen und der Wirkungsgrad erhöht wird.In the case of hotplates with so-called inductive heating, induction currents are generated with an induction coil located below the hotplate in the container made of ferromagnetic metal and containing the cooking material, which heats the container and thereby the cooking material contained therein. This solution has the advantage that the hot plates which are present in previous cookers and are heated with heating coils are eliminated and the efficiency is increased.

Die Speisung der Kochplatten erfolgt z.B. von einer Strom­quelle, die einen Wechselstrom mit einer Amplitude Spit­ze/Spitze von etwa 18 - 45 A und einer Frequenz zwischen 25 und 40 kHz liefert. Die jeweils einer Platte zugeführte Lei­stung beträgt dabei z.B. zwischen 300 W und 3 kW.The hot plates are supplied e.g. from a power source that supplies an alternating current with a peak / peak amplitude of approximately 18-45 A and a frequency between 25 and 40 kHz. The power supplied to each plate is e.g. between 300 W and 3 kW.

Bei einer bekannten Stromversorgungsschaltung für eine induk­tive Kochstelle (DE-PS 34 00 671) enthält die Stromquelle eine sogenannte Halbbrücke mit zwei in Reihe geschalteten Leistungstransistoren, die abwechselnd mot der Arbeitsfre­quenz leitend gesteuert und gesperrt werden und an ihrem Ver­bindungspunkt die Wechselspannung für die Heizspule liefern. An die Transistoren ist dabei eine Betriebsspannung ange­legt, die durch Gleichrichtung der Netzwechselspannung gewon­nen ist. Diese Betriebsspannung ist keine reine Gleichspan­nung, sondern eine pulsierende Gleichspannung mit einer Fre­quenz von 100 Hz. Das ist dadurch bedingt, daß für die verar­beiteten Leistungen der Aufwand für eine Siebung zu einer echten Gleichspannung untragbar hoch wäre.In a known power supply circuit for an inductive hotplate (DE-PS 34 00 671), the current source contains a so-called half-bridge with two power transistors connected in series, which are alternately controlled and blocked with alternating motions of the working frequency and supply the AC voltage for the heating coil at their connection point. An operating voltage, which is obtained by rectifying the AC line voltage, is applied to the transistors. This operating voltage is not a pure DC voltage, but a pulsating DC voltage with a frequency of 100 Hz. This is due to the fact that the effort required for screening to a real DC voltage would be prohibitively high for the processed services.

Es ist auch bekannt, eine Stromquelle zeitlich nacheinander an zwei oder mehr Kochplatten anzuschließen, um mit einer einzigen Stromquelle mehrere Kochplatten betreiben zu kön­nen. Es hat sich gezeigt, daß bei einer derartigen Umschal­ tung hörbare Störgeräusche auftreten. Diese sind besonders nachteilig, weil die Umschaltung zwischen den einzelnen Koch­platten relativ häufig, etwa in einem Abstand von 2 - 100 s erfolgt.It is also known to connect a power source successively to two or more hotplates in order to be able to operate a plurality of hotplates with a single power source. It has been shown that with such a shawl audible noise. These are particularly disadvantageous because the switching between the individual hot plates takes place relatively frequently, for example at a distance of 2 to 100 s.

Der Erfindung liegt die Aufgabe zugrunde, die genannten Stö­rungen bei der Umschaltung einer Stromquelle zwischen ver­schiedenen Kochplatten zu verringern. Diese Aufgabe wird durch die im Anspruch 1 beschriebene Erfindung gelöst. Vor­teilhafte Weiterbildungen der Erfindung sind in den Unteran­sprüchen beschrieben.The invention has for its object to reduce the disturbances mentioned when switching a power source between different hot plates. This object is achieved by the invention described in claim 1. Advantageous developments of the invention are described in the subclaims.

Der Mikroprozessor wird von der Stromquelle mit einer Span­nung gesteuert, die eine Information über den jeweiligen Nulldurchgang der Netzspannung beinhaltet. Außerdem enthält der Mikroprozessor die Werte über die Anzugszeit und die Ab­fallzeit der die Umschaltung bewirkenden Relais. Mittels die­ser Informationen steuert der Mikroprozessor die zwei Koch­platten zugeordneten Relais derart, daß im Bereich des Null­durchgangs der Netzspannung zunächst die eine Kochplatte ab­geschaltet und danach die andere Kochplatte eingeschaltet wird. Die unvermeidbare Anzugszeit und Abfallzeit des Relais wird also durch den Mikroprozessor einkalkuliert, derart, daß trotz dieser Zeiten und unabhängig von der jeweiligen Ar­beitsfrequenz, der Dauer der Anschaltung der einzelnen Plat­ten an die Stromquelle und der jeweils einer Platte zugeführ­ten Leistung die Umschaltung zwischen den Platten stets im Bereich des Nulldurchgangs der Netzspannung mit einer Tole­ranz von etwa ± 1-2 ms erfolgt.The microprocessor is controlled by the current source with a voltage which contains information about the respective zero crossing of the mains voltage. In addition, the microprocessor contains the values for the pick-up time and the drop-out time of the relays causing the changeover. By means of this information, the microprocessor controls the relays assigned to the two hotplates in such a way that in the region of the zero crossing of the mains voltage, one hotplate is first switched off and then the other hotplate is switched on. The inevitable pick-up time and fall-off time of the relay is thus factored in by the microprocessor, such that despite these times and regardless of the respective operating frequency, the duration of the connection of the individual plates to the power source and the power supplied to one plate, the switching between the plates always in the area of the zero crossing of the mains voltage with a tolerance of approximately ± 1-2 ms.

Vorzugsweise ist zusätzlich die Stromquelle im Umgebungsbe­reich des Nulldurchgangs der Netzspannung abgeschaltet, da­mit die Relaiskontakte immer im stromlosen Zustand geschal­tet werden.In addition, the current source in the vicinity of the zero crossing of the mains voltage is preferably switched off, so that the relay contacts are always switched in the de-energized state.

Durch die Umschaltung der Kochplatten im Umgebungsbereich des Nulldurchgangs der Netzspannung werden die an sich auf­tretenden hörbaren Störungen vermieden. Ein Vorteil besteht darin, daß das Netz während der hohen Amplituden, also in der Mitte zwischen zwei Nullstellen, praktisch nicht bela­stet ist und somit keine nennenswerten Störungen durch die Umschaltung auf das Netz gelangen.By switching the hot plates in the vicinity of the zero crossing of the mains voltage, the audible disturbances that occur are avoided. One advantage is that the network is practically not loaded during the high amplitudes, that is to say in the middle between two zeros, and therefore no significant disturbances occur due to the switchover to the network.

Die Erfindung wird im folgenden anhand der Zeichnung erläute­rt. Darin zeigen

  • Fig. 1 ein Prinzipschaltbild der erfindungsgemäßen Umschaltung,
  • Fig. 2 Kurven zur Erläuterung der Wirkungsweise der Schaltung nach Fig. 1,
  • Fig. 3 ein Diagramm zur Erläuterung einer für die Umschaltung bestehenden Vorschrift und
  • Fig. 4 eine Umschaltung gemäß einer Weiterbildung der Erfindung.
The invention is explained below with reference to the drawing. Show in it
  • 1 is a schematic diagram of the switchover according to the invention,
  • 2 curves to explain the operation of the circuit of FIG. 1,
  • Fig. 3 is a diagram for explaining an existing rule for switching and
  • 4 shows a switchover according to a development of the invention.

In Fig. 1 sind zwei Kochplatten P1, P2 über zwei Relais A und B an den Ausgang der Stromquelle G angeschlossen. Diese liefert an die Kochplatten P1 und P2 einen Wechselstrom mit einer Amplitude Spitze/Spitze von 20 - 40 A, einer Frequenz von 20 - 40 kHz und einer Leistung von 300 W - 3 kW. An die Stromquelle G ist die Betriebsspannung Ua angelegt, die eine aus der Netzspannung gewonnene pulsierende Gelichspannung mit 100 Hz ist. Der Mikroprozessor M steuert die Relais A und B sowie die Stromquelle G und wird außerdem von der Stromquelle G mit der Spannung Uo versorgt, die eine Informa­tion über den jeweiligen Nulldurchgang der Spannung Ua be­inhaltet.In Fig. 1, two hotplates P1, P2 are connected to the output of the current source G via two relays A and B. This delivers an alternating current to the hot plates P1 and P2 with an amplitude peak / peak of 20 - 40 A, a frequency of 20 - 40 kHz and a power of 300 W - 3 kW. The operating voltage Ua is applied to the current source G, which is a pulsating equilibrium voltage obtained at 100 Hz from the mains voltage. The microprocessor M controls the relays A and B and the current source G and is also supplied by the current source G with the voltage Uo, which contains information about the respective zero crossing of the voltage Ua.

Anhand der Fig. 2 wird die Umschaltung zwischen den Kochplat­ten P1 und P2 beschrieben. Bei to ist durch die Spannung Ua das Relais A angezogen und die Kochplatte P1 an die Strom­ quelle G angeschlossen. Das Relais B ist durch die Spannung UB nicht angezogen, so daß die Kochplatte P2 nicht an die Stromquelle G angeschlossen ist. Bei t1 wird die Spannung UA abgeschaltet. Das Relais A fällt jedoch aufgrund der Abfall­zeit noch nicht ab. Bei t2 erscheint die Spannung UB vom Mi­kroprozessor M, wobei jedoch wegen der Anzugszeit des Relais B zunächst keine Umschaltung erfolgt. Bei t3 wird durch die Spannung Us die Stromquelle G vom Prozessor M abgeschaltet. Der in die Platte P1 hineinfließende Strom wird also unter­brochen. Bei t4 erfolgt nach Ablauf der Abfallzeit t1 - t4 des Relais A die Abschaltung der Kochplatte P1 durch Öffnen der Kontakte des Relais A. t4 liegt innerhalb des Umgebungs­bereiches T der Nullstelle bei t5 in der Spannung Ua. Bei t6 spricht nach Ablauf der Anzugszeit von t2 - t6 das Relais B an. Dessen Kontakt wird geschlossen und somit die Platte P2 an die Stromquelle G angeschaltet. Bei t7 wird durch die Stellgröße Us die Stromquelle G wieder eingeschaltet, so daß jetzt die Platte P2 gespeist wird. Es wird also sicherge­stellt, daß die Umschaltung der Stromquelle G zwischen den Platten P1 und P2 immer im Umgebungsbereich T von etwa ± 1-2 ms der Nullstelle bei t5 und außerdem bei abgeschalteter Stromquelle G erfolgt.The switchover between the hotplates P1 and P2 will be described with reference to FIG. 2. At to the relay A is attracted by the voltage Ua and the hotplate P1 to the current source G connected. The relay B is not attracted by the voltage UB, so that the hotplate P2 is not connected to the current source G. The voltage UA is switched off at t1. However, relay A does not drop out due to the fall time. At t2, the voltage UB appears from the microprocessor M, but because of the pickup time of the relay B there is initially no changeover. At t3, the current source G is switched off by the processor M by the voltage Us. The current flowing into the plate P1 is therefore interrupted. At t4, after the fall-out time t1 - t4 of relay A, the hotplate P1 is switched off by opening the contacts of relay A. t4 lies within the surrounding area T of the zero point at t5 in the voltage Ua. At t6, relay B responds after the tightening time of t2 - t6 has elapsed. Its contact is closed and thus the plate P2 is switched on to the current source G. At t7, the current source G is switched on again by the manipulated variable Us, so that the plate P2 is now fed. It is thus ensured that the switching of the current source G between the plates P1 and P2 always takes place in the surrounding area T of approximately ± 1-2 ms of the zero point at t5 and also when the current source G is switched off.

Anhand der Fig. 3 wird eine Vorschrift erläutert. Un ist die Netzspannung. Bis t8 ist in der Kochstelle keine Platte an das Netz angeschlossen, die dem Netz entnommene Leistung N = 0. Von t8 - t9 ist eine Platte an das Netz angeschlossen, so daß die dem Netz entnommene Leistung N = NP ist. Von t9 - ­t10 ist wiederum die Kochplatte abgeschaltet und N = 0. Es besteht jetzt die Vorschrift, daß die Periode dieses Umscha­ltzyklus Tu von t8 - t10 einen bestimmten Mindestwert hat, der von der Leistung NP abhängig ist. Einige Werte sind in Fig. 3 dargestellt. Diese Vorschrift besteht, um Störungen anderer Verbraucher wie insbesondere von Leuchtkörpern in der Nähe der Kochstelle zu vermeiden.A rule is explained with reference to FIG. 3. Un is the mains voltage. Up to t8, no plate is connected to the network in the hotplate, the power removed from the network N = 0. From t8 - t9, a plate is connected to the network, so that the power removed from the network is N = NP. The cooking plate is again switched off from t9-t10 and N = 0. There is now a requirement that the period of this switching cycle Tu from t8-t10 has a certain minimum value which is dependent on the power NP. Some values are shown in Fig. 3. This regulation exists in order to avoid disruptions to other consumers, in particular lighting elements in the vicinity of the hotplate.

Fig. 4 zeigt eine Lösung für die Umschaltung, bei der auch bei größeren Leistungen bis 3 kW geringere Werte für Tu ge­wählt werden können, als sie an sich durch die Vorschrift ge­mäß Fig. 3 gegeben sind. Ab t11 wird die Platte P1 mit der Leistung NP1 von 3 kw gespeist. Bei t12 wird die Platte P1 abgeschaltet und stattdessen die Platte P2 mit einer Lei­stungsaufnahme von NP2 = 1 kW angeschaltet. Von t13 - t14 ist die Platte P2 abgeschaltet. Diese vorübergehende Abschal­tung dient zur Steuerung der von der Platte P2 aufgenommenen mittleren Leistung. Bei t15 wird wieder auf die Platte P1 umgeschaltet. t15 entspricht also t11 und Tu von Fig. 3 der Zeit von t11 - t15. Wenn bei t12 die Platte P1 ganz abge­schaltet würde, also auf N = 0, wäre gemäß der Vorschrift von Fig. 3 eine Periode Tu von 80 s erforderlich. Da gemäß Fig. 4 aber nur eine Umschaltung von NP1 auf NP2 erfolgt, die Differenz in der Leistung also nur 2 kW beträgt, gilt für den Mindestwert von Tu gemäß Fig. 3 der Wert von 20 s. Trotz der hohen Leistungsaufnahme der Platte P1 von NP1 = 3 kW kann also die relativ geringe Periode Tu von 20 s gewählt werden. Darüberhinaus kann für die Dauer der Speisung der Platte P2 von t12 - t15 der relativ geringe Wert von 2 s ge­wählt werden, weil dort die Differenz in der der Platte P2 zugeführten Leistung nur 1 kW beträgt. Durch die Umschaltung gemäß Fig. 4 kann also mit der Maximalleistung von 3 kW und der relativ geringen Periode Tu von 20 s gearbeitet werden. Eine geringere Periode der Anschaltung hat den Vorteil, daß bei gegebener Wärmeträgheit des Topfes ein geringerer Tempe­raturabfalls zwischen zwei Heizvorgängen und somit eine zeit­lich gleichmäßigere Erwärmung erzielt werden kann.FIG. 4 shows a solution for the switchover, in which lower values for Tu can be selected even with larger powers up to 3 kW than are given per se by the regulation according to FIG. 3. From t11, the plate P1 is fed with the power NP1 of 3 kw. At t12, plate P1 is switched off and plate P2 is switched on instead with a power consumption of NP2 = 1 kW. From t13 - t14, the plate P2 is switched off. This temporary shutdown is used to control the average power consumed by plate P2. At t15, the system switches back to plate P1. 3 therefore corresponds to t11 and t15. If the plate P1 were switched off completely at t12, that is to say to N = 0, a period Tu of 80 s would be required according to the regulation of FIG. 3. Since, however, according to FIG. 4 there is only a switchover from NP1 to NP2, the difference in output is only 2 kW, the value of 20 s applies to the minimum value of Tu according to FIG. 3. Despite the high power consumption of the plate P1 of NP1 = 3 kW, the relatively short period Tu of 20 s can be selected. In addition, the relatively low value of 2 s can be selected for the duration of supplying the plate P2 from t12-t15, because there the difference in the power supplied to the plate P2 is only 1 kW. 4, the maximum power of 3 kW and the relatively short period Tu of 20 s can be used. A shorter period of connection has the advantage that with a given heat inertia of the pot, a lower temperature drop between two heating processes and thus a more uniform heating over time can be achieved.

Die Erfindung wurde für die Umschaltung zwischen zwei Plat­ten P1, P2 beschrieben. Die Umschaltung gemäß Fig. 1, 2 ist auch für eine größere Zahl von Platten anwendbar, wenn z.B. die Stromquelle G zeitlich nacheinander auf vier verschiede­ne Platten geschaltet wird.The invention has been described for switching between two plates P1, P2. 1, 2 can also be used for a larger number of plates, for example if the current source G is switched in succession to four different plates.

Bei einem praktisch erprobten Ausführungsbeispiel lagen fol­gende Werte vor: Mikroprozessor M: Typ 6805 Motorola
Relais A, B: Typ ON-SH 112 DM Original Electric Manufacturing Co, Ltd
Anzugszeit von t2 - t6: 5 ms
Abfallzeit von t1 - t4: 10 - 15 ms
In a practical example, the following values were available: Microprocessor M: Type 6805 Motorola
Relay A, B: Type ON-SH 112 DM Original Electric Manufacturing Co, Ltd
Tightening time from t2 - t6: 5 ms
Fall time from t1 - t4: 10 - 15 ms

Claims (6)

1. Schaltung zur Stromversorgung einer induktiven Kochstel­le mit zwei nacheinander an eine von einer Netzspannung (Ua) gespeiste Stromquelle (G) anschließbaren Kochplat­ten (P1, P2) dadurch gekennzeichnet, daß die beiden Kochplatten (P1, P2) über je ein Relais (A, B) an die Stromquelle (G) angeschlossen und die Relais (A, B) durch einen Mikroprozessor (M) jeweils entsprechend der Anstiegs- und Abfallzeit der Relais (A, B) vor dem Null­durchgang (t5) der Netzspannung (Ua) so gesteuert sind, daß das Öffnen (t4) eines Relais (A) und das Schließen (t6) des anderen Relais (B) jeweils nacheinander im Um­gebungsbereich (T) des Nulldurchgangs (t5) der Netzspan­nung (Ua) erfolgen.1. Circuit for supplying power to an inductive hotplate with two hotplates (P1, P2) which can be connected in succession to a power source (G) fed by a mains voltage (Ua), characterized in that the two hotplates (P1, P2) each have a relay (A, B) connected to the power source (G) and the relays (A, B) controlled by a microprocessor (M) according to the rise and fall times of the relays (A, B) before the zero crossing (t5) of the mains voltage (Ua) are that the opening (t4) of a relay (A) and the closing (t6) of the other relay (B) take place successively in the surrounding area (T) of the zero crossing (t5) of the mains voltage (Ua). 2. Schaltung nach Anspruch 1, dadurch gekennzeichnet, daß der Umgebungsgereich (T) etwa ± 1-2 ms zum Nulldurch­gang (t5) beträgt.2. Circuit according to claim 1, characterized in that the surrounding area (T) is approximately ± 1-2 ms to the zero crossing (t5). 3. Schaltung nach Anspruch 1, dadurch gekennzeichnet, daß die beiden Platten (P1, P2) abwechselnd ohne zeitliche Unterbrechung der Einspeisung beim Übergang von einer Platte (P1) zur anderen Platte (P2) mit unterschiedli­chen Leistungen (NP1, NP2) gespeist werden (Fig. 4).3. Circuit according to claim 1, characterized in that the two plates (P1, P2) alternately without interruption of the feed in the transition from one Plate (P1) to the other plate (P2) with different powers (NP1, NP2) are fed (Fig. 4). 4. Schaltung nach Anspruch 3, dadurch gekennzeichnet, daß jeweils die Speisung einer Platte (P2) in sich Unterbre­chungen (t13 - t14) aufweist (Fig. 4).4. Circuit according to claim 3, characterized in that in each case the supply of a plate (P2) has interruptions (t13 - t14) (Fig. 4). 5. Schaltung nach Anspruch 1, dadurch gekennzeichnet, daß die Umschaltung zwischen den Platten (P1, P2) vom Mikro­prozessor (M) in derart zeitlichen Abständen er­folgt, daß der zur Vermeidung von Störungen anderer elektrischer Verbraucher vorgeschriebene, von der Lei­stung (NP) abhängige Mindestwert der Periode (Tu) des Umschaltzyklus (t11 - t15) eingehalten wird.5. Circuit according to claim 1, characterized in that the switching between the plates (P1, P2) by the microprocessor (M) takes place at such time intervals that the prescribed to avoid interference with other electrical consumers, dependent on the power (NP) Minimum value of the period (Tu) of the switching cycle (t11 - t15) is observed. 6. Schaltung nach Anspruch 1, dadurch gekennzeichnet, daß die Stromquelle (G) während des Umgebungsbereiches (T) durch den Mikroprozessor (M) abgeschaltet ist.6. Circuit according to claim 1, characterized in that the current source (G) is switched off during the surrounding area (T) by the microprocessor (M).
EP88105358A 1987-04-10 1988-04-02 Circuit for supplying power to an indution heating cooking apparatus Expired - Lifetime EP0286044B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88105358T ATE70399T1 (en) 1987-04-10 1988-04-02 CIRCUIT FOR THE POWER SUPPLY OF AN INDUCTIVE COOKING PLATE.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19873712242 DE3712242A1 (en) 1987-04-10 1987-04-10 CIRCUIT FOR POWERING AN INDUCTIVE COOKING POINT
DE3712242 1987-04-10

Publications (3)

Publication Number Publication Date
EP0286044A2 true EP0286044A2 (en) 1988-10-12
EP0286044A3 EP0286044A3 (en) 1989-01-11
EP0286044B1 EP0286044B1 (en) 1991-12-11

Family

ID=6325367

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88105358A Expired - Lifetime EP0286044B1 (en) 1987-04-10 1988-04-02 Circuit for supplying power to an indution heating cooking apparatus

Country Status (6)

Country Link
EP (1) EP0286044B1 (en)
JP (1) JPS63269478A (en)
AT (1) ATE70399T1 (en)
DE (2) DE3712242A1 (en)
ES (1) ES2028923T3 (en)
GR (1) GR3004028T3 (en)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0724379A1 (en) * 1995-01-25 1996-07-31 MENEGHETTI Ampelio, STRAGLIOTTO Maria, MENEGHETTI Cesira, MENEGHETTI Tiziano dba MENEGHETTI AMPELIO & C. S.n.c. Control device particularly for induction cooking ranges with multiple heating elements
EP0817531A2 (en) * 1996-06-26 1998-01-07 Balay S.A. Flexible and re-configurable topology
EP0844807A1 (en) * 1996-11-21 1998-05-27 Balay S.A. Optimal Control of the installed power in domestic induction cooking hobs with re-configurable structure topology
ES2201937A1 (en) * 2003-11-03 2004-03-16 Bsh Electrodomesticos España, S.A. Method for avoiding or reducing noise interference in a converter circuit with multiple simultaneously operated outputs
EP1951003A1 (en) * 2007-01-23 2008-07-30 Whirlpool Corporation Control method for induction cooking hob and induction cooking hob adapted to carry out such method
WO2008092476A1 (en) * 2007-02-01 2008-08-07 Wmf Württembergische Metallwarenfabrik Ag Induction hob
EP2200399A1 (en) * 2008-12-22 2010-06-23 FagorBrandt SAS Method for supplying power to at least one induction unit and cooking device implementing said method
EP2200398A1 (en) * 2008-12-22 2010-06-23 FagorBrandt SAS Method for supplying power to two induction units and cooking device implementing said method
EP2214454A1 (en) * 2009-01-28 2010-08-04 BSH Bosch und Siemens Hausgeräte GmbH Induction hob with multiple inductors

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4208252A1 (en) * 1992-03-14 1993-09-16 Ego Elektro Blanc & Fischer INDUCTIVE COOKING HEATING
DE102008015036A1 (en) 2008-03-14 2009-09-17 E.G.O. Elektro-Gerätebau GmbH Apparatus and method for controlling induction heating of an induction hob
ES2362607B1 (en) * 2009-08-27 2012-06-05 Bsh Electrodomésticos España, S.A. MULTIPLEXATION OF INDUCTION HEATING LOADS.
ES2531904B1 (en) * 2013-09-18 2016-01-04 Bsh Electrodomésticos España, S.A. Cooking countertop device

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US4114009A (en) * 1976-02-03 1978-09-12 Matsushita Electric Industrial Co., Ltd. Switching and heat control mechanism for induction heating cooking apparatus having a plurality of work coils
US4308443A (en) * 1979-05-01 1981-12-29 Rangaire Corporation Induction cook-top with improved touch control
DE3400671C1 (en) * 1984-01-11 1985-10-24 Thomson Brandt Gmbh Inverter for feeding a consumer with an inductive component

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US3925633A (en) * 1974-09-06 1975-12-09 Donald F Partridge Circuit for controlling power flow from a high frequency energy source to a plurality of high frequency loads
DE2901556A1 (en) * 1979-01-16 1980-07-24 Ego Regeltech COOKING DEVICE FOR INDUCTIVE HEATING OF A COOKING VESSEL
EP0040017B1 (en) * 1980-05-08 1984-07-18 LUCAS INDUSTRIES public limited company Switching system for sequential connection of loads to an electrical supply
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US4527049A (en) * 1984-02-09 1985-07-02 Raytheon Company Microprocessor controlled electric range

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Publication number Priority date Publication date Assignee Title
DE1264643B (en) * 1960-05-18 1968-03-28 Werner & Pfleiderer Temperature control device for electrically heated ovens, especially baking and drying ovens
US4114009A (en) * 1976-02-03 1978-09-12 Matsushita Electric Industrial Co., Ltd. Switching and heat control mechanism for induction heating cooking apparatus having a plurality of work coils
US4308443A (en) * 1979-05-01 1981-12-29 Rangaire Corporation Induction cook-top with improved touch control
DE3400671C1 (en) * 1984-01-11 1985-10-24 Thomson Brandt Gmbh Inverter for feeding a consumer with an inductive component

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5714739A (en) * 1995-01-25 1998-02-03 Meneghetti Ampelio & C. S.N.C. Control device particularly for induction cooking ranges with multiple heating elements
EP0724379A1 (en) * 1995-01-25 1996-07-31 MENEGHETTI Ampelio, STRAGLIOTTO Maria, MENEGHETTI Cesira, MENEGHETTI Tiziano dba MENEGHETTI AMPELIO & C. S.n.c. Control device particularly for induction cooking ranges with multiple heating elements
EP0817531A2 (en) * 1996-06-26 1998-01-07 Balay S.A. Flexible and re-configurable topology
EP0817531A3 (en) * 1996-06-26 1998-04-08 Balay S.A. Flexible and re-configurable topology
EP0844807A1 (en) * 1996-11-21 1998-05-27 Balay S.A. Optimal Control of the installed power in domestic induction cooking hobs with re-configurable structure topology
USRE43263E1 (en) 2003-11-03 2012-03-27 Bsh Bosch Und Siemens Hausgeraete Gmbh Method for operating a frequency converter circuit
ES2201937A1 (en) * 2003-11-03 2004-03-16 Bsh Electrodomesticos España, S.A. Method for avoiding or reducing noise interference in a converter circuit with multiple simultaneously operated outputs
EP1951003A1 (en) * 2007-01-23 2008-07-30 Whirlpool Corporation Control method for induction cooking hob and induction cooking hob adapted to carry out such method
EP1951003B2 (en) † 2007-01-23 2022-11-16 Whirlpool Corporation Control method for induction cooking hob and induction cooking hob adapted to carry out such method
WO2008092476A1 (en) * 2007-02-01 2008-08-07 Wmf Württembergische Metallwarenfabrik Ag Induction hob
EP2200399A1 (en) * 2008-12-22 2010-06-23 FagorBrandt SAS Method for supplying power to at least one induction unit and cooking device implementing said method
EP2200398A1 (en) * 2008-12-22 2010-06-23 FagorBrandt SAS Method for supplying power to two induction units and cooking device implementing said method
EP2214454A1 (en) * 2009-01-28 2010-08-04 BSH Bosch und Siemens Hausgeräte GmbH Induction hob with multiple inductors

Also Published As

Publication number Publication date
GR3004028T3 (en) 1993-03-31
ATE70399T1 (en) 1991-12-15
DE3866751D1 (en) 1992-01-23
EP0286044B1 (en) 1991-12-11
JPS63269478A (en) 1988-11-07
DE3712242A1 (en) 1988-10-27
ES2028923T3 (en) 1992-07-16
EP0286044A3 (en) 1989-01-11

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