EP3611430B1 - Steuerschaltung für ein wasserversorgungssystem einer dampfgarvorrichtung - Google Patents

Steuerschaltung für ein wasserversorgungssystem einer dampfgarvorrichtung Download PDF

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Publication number
EP3611430B1
EP3611430B1 EP18189164.9A EP18189164A EP3611430B1 EP 3611430 B1 EP3611430 B1 EP 3611430B1 EP 18189164 A EP18189164 A EP 18189164A EP 3611430 B1 EP3611430 B1 EP 3611430B1
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EP
European Patent Office
Prior art keywords
control circuit
valve
feeding system
water feeding
temperature sensor
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.)
Active
Application number
EP18189164.9A
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English (en)
French (fr)
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EP3611430A1 (de
Inventor
Claudia PATELLA
Massimo Banzato
Elia SCHIARATURA
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.)
Electrolux Appliances AB
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Electrolux Appliances AB
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Publication date
Application filed by Electrolux Appliances AB filed Critical Electrolux Appliances AB
Priority to EP18189164.9A priority Critical patent/EP3611430B1/de
Publication of EP3611430A1 publication Critical patent/EP3611430A1/de
Application granted granted Critical
Publication of EP3611430B1 publication Critical patent/EP3611430B1/de
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
    • F22D5/00—Controlling water feed or water level; Automatic water feeding or water-level regulators
    • F22D5/26—Automatic feed-control systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B1/00—Methods of steam generation characterised by form of heating method
    • F22B1/28—Methods of steam generation characterised by form of heating method in boilers heated electrically

Definitions

  • the present invention relates to a control circuit for a water feeding system of a steam cooking appliance. Further, the present invention relates to a water feeding system for a steam cooking appliance. Moreover, the present invention relates to a steam cooking appliance.
  • the water is delivered from a water tank to a steam generator, wherein the water flow is controlled by one or more valves.
  • said valves are controlled by an electronic control circuit with a microcontroller.
  • a switching AC/DC converter is required for supplying the control circuit. This results in a complex apparatus for controlling the water feeding system.
  • said valves are controlled by electromechanical circuits. Said electromechanical circuits may be enabled manually or by electromechanical components, e.g. thermal cut out switches.
  • US 2008/292761 A1 discloses a steam cooking device with a control system for regulating a feed water valve as a function of detected temperature of a heater unit of the steam cooking device.
  • CN 204 213 890 U discloses a circuit for detecting the opening of a boiler valve by detecting the temperature of the boiler valve using a Zener diode.
  • US 2012/061378 A1 discloses temperature control of a steam cooking appliance by a circuit comprising a Zener diode.
  • control circuit for a water feeding system of a steam cooking appliance according to claim 1.
  • a control circuit for a water feeding system of a steam cooking appliance is provided, wherein:
  • control circuit comprises passive analogue electronic elements only.
  • the control circuit does not require a microcontroller. This reduces the complexity of the control circuit.
  • the temperature sensor is a temperature dependent resistor element, preferably an NTC (negative temperature coefficient) resistor element.
  • NTC negative temperature coefficient
  • valve control circuit includes a series of a first resistor element and the Zener diode, wherein said series is connected to an DC output of the rectifier circuit.
  • the temperature sensor and a second resistor element may be connected in series, wherein said series is connected parallel to the Zener diode.
  • valve is connectable or connected parallel to the series of the first resistor element and the temperature sensor. More generally, the valve is connected to a switch controlled by the temperature sensor.
  • said switch may be a bipolar junction transistor or a metal oxide semiconductor transistor.
  • valve control circuit may include a square wave generator for controlling the opening and closing of the valve.
  • valve control circuit includes a NOT gate for resetting the square wave generator.
  • the rectifier circuit includes four diodes forming a bridge rectifier circuit.
  • the rectifier circuit may include at least one capacitor connected parallel to the DC output, wherein preferably the capacitor acts as smoothing capacitor.
  • control circuit is enabled by a selector switch.
  • the present invention relates to a water feeding system for a steam cooking appliance, wherein said water feeding system comprises at least one control circuit mentioned above, and wherein the water feeding system comprises at least one water tank and at least one steam generator, wherein said water tank and steam generator are interconnected by loading tube.
  • the loading tube is openable and closable by the valve.
  • the temperature sensor is arranged in, at or close to the steam generator.
  • the present invention relates to a steam cooking appliance comprising the control circuit and/or the water feeding system mentioned above.
  • FIG 1 illustrates a schematic block diagram of a water feeding system 10 for a steam cooking appliance according to a preferred embodiment of the present invention.
  • the water feeding system 10 comprises a water tank 12, a loading tube 14, a valve 16, a control circuit 18 and a steam generator 20.
  • the control circuit 18 includes a temperature sensor 22 arranged in the environment of the steam generator 20.
  • the loading tube 14 is interconnected between the water tank 12 and the steam generator 20.
  • the loading tube 14 delivers water from the water tank 12 to the steam generator 20.
  • the loading tube 14 is opened and closed by the valve 16.
  • the steam generator 20 generates steam by heating up water from the water tank 12.
  • the temperature sensor 22 detects the temperature of said steam.
  • the temperature sensor 22 is an NTC and fixed on the surface of the steam generator 20. Said NTC detects missing water by temperature detection. For example, the safety may be guaranteed by a thermal cut out switch.
  • the temperature sensor 22 is connected to an input of the control circuit 18.
  • An output of said control circuit 18 is connected to the valve 16.
  • the valve 16 is opened and closed by the control circuit 18.
  • the valve 16 is an electrical valve. Preferably, the valve is opened and closed by a solenoid.
  • the valve 16 is controlled by the control circuit 18.
  • the valve 16 provides water for the water feeding system 10, i.e. at least for the steam generator 20.
  • the temperature detected by the temperature sensor 22 correlates directly with the amount of water inside the steam generator 20. A low water level or absent water causes an increasing of the temperature detected by the temperature sensor 22.
  • FIG 2 illustrates a schematic circuit diagram of the control circuit 18 for the valve 16 of water feeding system 10 for the steam cooking appliance according to a first embodiment of the present invention.
  • the control circuit 18 includes a rectifier circuit 26 and a valve control circuit 28.
  • the rectifier circuit 26 and the valve control circuit 28 are arranged on a common printed circuit board.
  • the rectifier circuit 26 and the valve control circuit 28 are arranged on separate printed circuit boards.
  • the control circuit 18 includes a selector switch S1.
  • the rectifier circuit 26 includes four diodes D1, D2, D3 and D4 and a capacitor C1.
  • the diodes D1 to D4 form a bridge rectifier circuit.
  • Said bridge rectifier circuit includes an AC input and a DC output.
  • the capacitor C1 is connected parallel to the DC output.
  • the capacitor C1 acts as smoothing capacitor.
  • the valve control circuit 28 is connected to the DC output of the rectifier circuit 26.
  • the valve control circuit 28 includes a first resistor element R1, a second resistor element R2, a Zener diode Z1 and the temperature sensor 22.
  • the valve control circuit 28 includes more than one first resistor element R1 according to the power dissipation.
  • the temperature sensor 22 is a NTC (negative temperature coefficient) resistor element, wherein the resistance of said NTC resistor element 22 decreases with an increasing temperature.
  • the temperature sensor 22 and the second resistor element R2 are connected in series.
  • the Zener diode Z1 is connected parallel to said series of the temperature sensor 22 and the second resistor element R2.
  • the first resistor element R1 is connected in series with the Zener diode Z1 and the series of the temperature sensor 22 and the second resistor element R2.
  • the series of the first resistor element R1 and the Zener diode Z1 is connected to the DC output of the rectifier circuit 26.
  • the bond of the temperature sensor 22 and the second resistor element R2 is connected to a control input of the selector switch S1.
  • a temperature threshold value is defined by second resistor element R2.
  • the Zener diode Z1 provides a stable voltage across the resistive voltage divider.
  • the present invention allows the control of the water supply for the steam generator 20 by passive electric and electronic elements only. A microcontroller or the like is not required. Thus, the control of the water supply for the steam generator 20 is realised by low complexity.
  • FIG 3 illustrates a schematic circuit diagram of the control circuit 18 for the valve 16 of water feeding system 10 for the steam cooking appliance according to a second embodiment of the present invention.
  • the control circuit 18 includes the rectifier circuit 26 and the valve control circuit 28 are arranged either on a common printed circuit board or on separate printed circuit boards. Further, the control circuit 18 includes the selector switch S1.
  • the rectifier circuit 26 includes the four diodes D1, D2, D3 and D4 and the capacitor C1.
  • the diodes D1 to D4 form the bridge rectifier circuit including the AC input and the DC output.
  • the capacitor C1 is connected parallel to the DC output and acts as smoothing capacitor.
  • the valve control circuit 28 is connected to the DC output of the rectifier circuit 26.
  • the valve control circuit 28 includes the first resistor element R1, the second resistor element R2, the Zener diode Z1 and the temperature sensor 22.
  • the valve control circuit 28 of the second embodiment differs from that of the first embodiment by a NOT gate 30, a square wave generator 32 and a third resistor element R3.
  • the NOT gate 30, the square wave generator 32 and the third resistor element R3 are connected in series and interconnected between the bond of the temperature sensor 22 and the second resistor element R2 on the one hand and the input of the selector switch S1 on the other hand. Due to the thermal inertia of the system, the square wave generator 32 is used for controlling the opening and closing of the valve 16.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Cookers (AREA)

Claims (14)

  1. Steuerschaltung (18) für ein Wasserzufuhrsystem (10) eines Dampfkochgeräts, wobei:
    - die Steuerschaltung (18) eine Gleichrichterschaltung (26) und eine Ventilsteuerschaltung (28) umfasst,
    - die Ventilsteuerschaltung (28) mit einem Gleichspannungsausgang der Gleichrichterschaltung (26) verbunden ist,
    - die Ventilsteuerschaltung (28) zum Steuern eines elektrischen Ventils (16) für eine Wasserzufuhr vorgesehen ist,
    dadurch gekennzeichnet, dass die Ventilsteuerschaltung (28) wenigstens einen Temperatursensor (22) und wenigstens eine Zener-Diode (Z1) umfasst, und dass die Ventilsteuerschaltung (28) konfiguriert ist, das Ventil (16) in Abhängigkeit von einer Temperatur, die durch den Temperatursensor (22) detektiert wird, zu öffnen und zu schließen.
  2. Steuerschaltung nach Anspruch 1, wobei der Temperatursensor (22) ein temperaturabhängiges Widerstandselement, vorzugsweise ein NTC-Widerstandselement (Widerstandselement mit negativem Temperaturkoeffizienten) ist.
  3. Steuerschaltung nach Anspruch 1 oder 2, wobei die Ventilsteuerschaltung (28) eine Reihenschaltung eines ersten Widerstandselements (R1) und der Zener-Diode (Z1) umfasst, wobei die Reihenschaltung mit einem Gleichspannungsausgang der Gleichrichterschaltung (26) verbunden ist.
  4. Steuerschaltung nach einem der vorhergehenden Ansprüche, wobei der Temperatursensor (22) und ein zweites Widerstandselement (R2) in Reihe geschaltet sind, wobei die Reihenschaltung parallel zu der Zener-Diode (Z1) geschaltet ist.
  5. Steuerschaltung nach einem der vorhergehenden Ansprüche, wobei das Ventil (16) parallel zu der Reihenschaltung des ersten Widerstandselements (R1) und des Temperatursensors (22) geschaltet werden kann oder geschaltet wird.
  6. Steuerschaltung nach einem der Ansprüche 1 bis 4, wobei die Ventilsteuerschaltung (28) einen Rechteckwellengenerator (32) zum Steuern des Öffnens und Schließens des Ventils (16) umfasst.
  7. Steuerschaltung nach Anspruch 6, wobei die Ventilsteuerschaltung (28) ein NICHT-Gatter zum Zurücksetzen des Rechteckwellengenerators (32) umfasst.
  8. Steuerschaltung nach einem der vorhergehenden Ansprüche, wobei die Gleichrichterschaltung (26) vier Dioden (D1, D2, D3, D4) umfasst, die eine Brücken-Gleichrichterschaltung bilden.
  9. Steuerschaltung nach einem der vorhergehenden Ansprüche, wobei die Gleichrichterschaltung (26) wenigstens einen Kondensator (C1) umfasst, der zum Gleichspannungsausgang parallel geschaltet ist, wobei der Kondensator (C1) vorzugsweise als Glättungskondensator dient.
  10. Steuerschaltung nach einem der vorhergehenden Ansprüche, wobei die Steuerschaltung (18) durch einen Auswahlschalter (S1) aktiviert wird.
  11. Wasserzufuhrsystem (10) für ein Dampfkochgerät, wobei das Wasserzufuhrsystem (10) wenigstens eine Steuerschaltung (18) nach einem der vorhergehenden Ansprüche umfasst,
    wobei das Wasserzufuhrsystem (10) wenigstens einen Wassertank (12) und wenigstens einen Dampfgenerator (20) umfasst, wobei der Wassertank (12) und der Dampfgenerator (20) durch ein Laderohr (14) miteinander verbunden sind.
  12. Wasserzufuhrsystem nach Anspruch 11, wobei das Laderohr (14) durch das Ventil (16) geöffnet und geschlossen werden kann.
  13. Wasserzufuhrsystem nach Anspruch 11 oder 12, wobei der Temperatursensor (22) im, am oder nahe am Dampfgenerator (20) angeordnet ist.
  14. Dampfkochgerät, das eine Steuerschaltung (18) nach einem der Ansprüche 1 bis 10 und/oder ein Wasserzufuhrsystem (10) nach einem der Ansprüche 11 bis 13 umfasst.
EP18189164.9A 2018-08-15 2018-08-15 Steuerschaltung für ein wasserversorgungssystem einer dampfgarvorrichtung Active EP3611430B1 (de)

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Application Number Priority Date Filing Date Title
EP18189164.9A EP3611430B1 (de) 2018-08-15 2018-08-15 Steuerschaltung für ein wasserversorgungssystem einer dampfgarvorrichtung

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Application Number Priority Date Filing Date Title
EP18189164.9A EP3611430B1 (de) 2018-08-15 2018-08-15 Steuerschaltung für ein wasserversorgungssystem einer dampfgarvorrichtung

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EP3611430A1 EP3611430A1 (de) 2020-02-19
EP3611430B1 true EP3611430B1 (de) 2021-07-21

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CN111911907B (zh) * 2020-06-17 2022-02-15 东南大学 一种基于归一化误差积分的加热器水位控制品质评估方法

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH448304A (de) * 1963-11-05 1967-12-15 Philips Nv Uberwachungsgerät für Kochzwecke
US4430540A (en) * 1981-06-15 1984-02-07 Texas Instruments Incorporated Data input apparatus for microwave oven controllers
JP3414043B2 (ja) * 1994-04-22 2003-06-09 松下電器産業株式会社 電熱器具
FR2861974B1 (fr) * 2003-11-06 2006-02-10 Brandt Ind Procede et four de cuisson a la vapeur ayant une alimentation en eau perfectionnee
CA2759322C (en) * 2009-05-16 2017-01-17 Ideas Well Done Llc Food steamer containers with sequential ohmic water heating
US8743523B2 (en) * 2010-07-28 2014-06-03 General Electric Company Systems, methods, and apparatus for limiting voltage across a switch
JP6145919B2 (ja) * 2013-02-13 2017-06-14 パナソニックＩｐマネジメント株式会社 点灯装置及びそれを用いた照明器具
CN204017836U (zh) * 2014-08-05 2014-12-17 江苏国立化工科技有限公司 反应容器
CN204213890U (zh) * 2014-10-13 2015-03-18 杭州乾龙电器有限公司 锅炉开阀检测器

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