NL2004917C2 - Device and method for electrically controlled turning off of a gas flame of a gas hob. - Google Patents

Device and method for electrically controlled turning off of a gas flame of a gas hob. Download PDF

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Publication number
NL2004917C2
NL2004917C2 NL2004917A NL2004917A NL2004917C2 NL 2004917 C2 NL2004917 C2 NL 2004917C2 NL 2004917 A NL2004917 A NL 2004917A NL 2004917 A NL2004917 A NL 2004917A NL 2004917 C2 NL2004917 C2 NL 2004917C2
Authority
NL
Netherlands
Prior art keywords
gas
solenoid valve
switch
thermocouple
electrically controlled
Prior art date
Application number
NL2004917A
Other languages
Dutch (nl)
Inventor
Sjoerd Michiel Haaster
Theodorus Hermanus Tinneveld
Original Assignee
Intell Properties B V
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 Intell Properties B V filed Critical Intell Properties B V
Priority to NL2004917A priority Critical patent/NL2004917C2/en
Application granted granted Critical
Publication of NL2004917C2 publication Critical patent/NL2004917C2/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N1/00—Regulating fuel supply
    • F23N1/002—Regulating fuel supply using electronic means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/02—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium
    • F23N5/10—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using thermocouples
    • F23N5/102—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using thermocouples using electronic means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/20—Systems for controlling combustion with a time programme acting through electrical means, e.g. using time-delay relays
    • F23N5/203—Systems for controlling combustion with a time programme acting through electrical means, e.g. using time-delay relays using electronic means
    • 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
    • F24C3/00—Stoves or ranges for gaseous fuels
    • F24C3/12—Arrangement or mounting of control or safety devices
    • F24C3/126—Arrangement or mounting of control or safety devices on ranges
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/02—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium
    • F23N5/10—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using thermocouples
    • F23N5/107—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using thermocouples using mechanical means, e.g. safety valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/20—Systems for controlling combustion with a time programme acting through electrical means, e.g. using time-delay relays

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Combustion (AREA)

Description

Device and method for electrically controlled turning off of a gas flame of a gas hob
The invention relates to a device and method for electrically controlled turning off of a gas flame of a gas hob.
5
The use of thermocouples in gas appliances is known as such. Such thermocouples produce an electrical output when a gas burner has been lit. This electrical output is used to maintain a solenoid valve open. If the flame is extinguished, the temperature of the thermocouple drops resulting in a reduced voltage being 10 produced which in turn results in the solenoid valve being forced into a closed position and thereby turning off the supply of gas. Typically, a thermocouple produces a voltage of 35 mV in an open circuit.
State of the art devices use relays incorporated into an electric circuit of the thermocouple to disconnect the circuit so as to close the gas valve. Although small, a 15 contact resistance of the relay limits the availability of current to the solenoid valve. Over time, the degree of resistance presented by the contact terminals of the relay may increase due to contact wear and contamination in the cooking environment. With a relatively small contact resistance, the circuit may still operate although a greater voltage will be required from the output of the thermocouple. In practice this will result in 2 0 a longer period being required before the solenoid is activated and as the contact resistance increases, an even longer period of time is required for the control devices to be manually held in place before the solenoid valve engages. In the extreme condition, the voltage drop across the resistance increases to an extent that there is no longer sufficient power available at the solenoid valve for it to maintain the valve in an open 25 state. If this is the case, the switch needs to be replaced.
In patent publication GB 2344877A, a resistance was placed in series between the thermocouple and the solenoid valve, and a switch was placed in parallel with the resistor. In this way, the resistor compensated for the presence of contact resistance at the contacts of the switch such that an additional transmission path is provided when 30 the switch is closed and a degree of resistance is provided when the switch connects the output of the output of the thermocouple to ground. The switch itself may still get polluted and eventually must be replaced.
Patent publication EP 1505344 A2 describes a device for electrically controlled turning off of a gas flame of a gas hob. The gas flame is turned off by applying a 35 compensation current onto the circuit formed by the thermocouple and the solenoid valve. The circuit is not disconnected since it is believed that this sensitive 2 thermocouple circuit must not be disconnected by means of a switch. The disadvantage of the solution of EP 1505344 A2 is that in the absence of electrical power, the thermocouple circuit can not be disturbed in order to turn off the gas flame. This may lead to unwanted situations.
5 It is the object of the present invention to overcome one or more of the problems of the state of the art mentioned above.
This object is achieved by providing a device for electrically controlled turning off of a gas flame of a gas hob, the device comprising: - a solenoid valve for opening and turning off a gas supply to the gas hob; 10 - a thermocouple for proving a current to the solenoid valve; - a switch for switching off the current to the solenoid valve resulting in the solenoid valve being forced into a closed position and thereby turning off the supply of gas, wherein the switch comprises a semiconductor transistor; - a control unit for controlling the switch.
15
By using a semiconductor as a switch, the resistance of the switch will not increase over time as was the case with the contact resistance of mechanical switches. Furthermore, pollution of the switch does not occur since it is a semiconductor switch which can not be influenced by filth or grease.
2 0 According to a particular embodiment, the semiconductor transistor comprises a
Field Effect Transistor (FET). By using a field effect transistor (FET) the switch has a very low resistance which will not, or little, influence the voltage across the solenoid valve.
According to an embodiment, the switch comprises a MESFET which may be a 2 5 MOSFET or any other type of MESFET.
In an embodiment, a MESFET is used having a drain-source resistance RDs(on) for which counts: RDS(on)< 2mQ at VGs > 4 V, with VGs being the applied voltage between the gate and source of the MESFET.
Alternatively, the semiconductor transistor may be a so-called IGBT.
30 In an embodiment, the device comprises a control unit for controlling the VGS of the FET. The control unit may comprise a connection to an on/off button for manually switching off the thermocouple and thus the gas flame. The control unit may also comprise a timer, which can be set by the user. If the time set in the timer expires, the gas flame will be turned off. This will increase the safety of the gas stove. If for example 35 the user forgets to turn off the flame himself, the timer will ultimately cause the thermocouple to be switched off and thus the gas flame.
3
The invention also relates to a method for electrically controlled turning off of a gas flame of a gas hob, the method comprising: - opening and turning off a gas supply to the gas hob by means of a solenoid valve; 5 - proving a current to the solenoid valve by means of a thermocouple; - switching off the current to the solenoid valve by means of a switch resulting in the solenoid valve being forced into a closed position and thereby turning off the supply of gas, wherein the switch comprises a semiconductor transistor; - controlling the switch by means of a control unit.
10
Further details and advantages of the present invention will become clear to the reader after reading the description of the embodiments described below with reference to the accompanying drawings, in which:
Figure 1 shows a scheme of a device for electronically controlling the gas flow to a 15 gas hob according to an embodiment;
Figure 2 shows a graph of the characteristics of the HEXFET® Power MOSFET.
Figure 1 shows a scheme of a device for electronically controlling the gas flow to a gas hob according to an embodiment. The device comprises a thermocouple 1 and a 2 0 solenoid valve 3. The solenoid valve 3 opens and closes a gas supply to a gas hob, not shown. In use, the thermocouple 1 is heated by a gas flame 2. The thermocouple 1 is connected to the solenoid valve 3 via a MOSFET 4. The gate-source voltage of the MOSFET 4 is controlled by a control unit 5. The control unit 5 comprises a timer and is also connected to a display unit 6. This display unit 5 may be integrated in a gas stove.
2 5 In the embodiment of Figure 1, an n-channel MOSFET enhanced type transistor is used. Other types of MOSFETs may be used as well such as p-channel MOSFETs or depletion type MOSFETs.
Alternatively, an IGFET could be used for switching the current. An IGFET is related to the MOSFET, though it has a gate insulator that is not oxide. A more general 30 term for IGFET and MOSFET is MESFET.
According to a further embodiment, the device comprises an IGBT transistor. An IGBT is normally used for high power switching but could as well be used to disconnect the thermocouple 1 from the solenoid valve 3. An IGBT combines the gate characteristics of a MOSFET transistor with the possibility of high currents and low 35 saturation voltages of a bipolar transistor by placing a MOSFET and a bipolar power transistor in a single housing.
4
In an embodiment, the FET used for switching comprises a HEXFET® Power MOSFET available at the company International Rectifier. Figure 2 shows a graph of the characteristics of the HEXFET® Power MOSFET. The graph shows the drain-to-source resistance Rds when the MOSFET is steered open as a function of the gate-to-5 source voltage Vgs- As can be seen from Figure 2, the resistance RDs is lower than 2 mQ when the voltage Vgs is higher than 4 V at room temperature, i.e. 25 °C. Using a semiconductor switch having such a low resistance, improves the functioning of the device, making it possible to disconnect the thermocouple 1 from the solenoid valve 3 without too much loss of voltage drop. The control unit 5 may comprise circuitry 10 powered by a 5V power supply. Such a unit will produce no more than Vgs=5V. But this is sufficient to put this MOSFET into its low resistive range, see Figure 2. Of course higher voltages are possible using suitable control units.
The invention is by no means limited to the use of a FET. Also other transistors may be used. Especially a JFET transistor or a so-called MODFET could be used to 15 switch the thermocouple on/off. Since a MESFET does not have a gate-source junction, the control current does not affect the current to be switched which is favourable for this application.
It is emphasized that the present invention can be varied in many ways, of which 2 0 the alternative embodiments as presented are just a few examples. These different embodiments are hence non-limiting examples. The scope of the present invention, however, is only limited by the subsequently following claims.
5
List of abbreviation.
MOSFET: metal-oxide-semiconductor field-effect transistor MODFET: modulation-doped field-effect transistor 5 MESFET: metal-semiconductor field-effect transistor JFET: Junction field-effect transistor FET: Field-effect transistor IGFET: insulated-gate field-effect transistor IGBT: Insulated gate bipolar transistor

Claims (8)

1. Inrichting voor het elektrisch bestuurd uitzetten van een gasvlam van een gaskookelement, the inrichting omvattend: 5. een solenoïde klep voor het openen en sluiten van een gastoevoer richting het gaskookelement; - een thermokoppel voor het leveren van een stroom naar de solenoïde klep; - een schakelaar voor het uitschakelen van de stroom nar de solenoïde klep zodat de solenoïde klep in een gesloten stand wordt gedwongen zodat de 10 gastoevoer wordt afgesloten, waarbij de schakelaar een halfgeleider transistor omvat; - een besturingseenheid voor het besturen van de schakelaar.A device for electrically controlled expansion of a gas flame of a gas cooking element, the device comprising: 5. a solenoid valve for opening and closing a gas supply towards the gas cooking element; - a thermocouple for supplying a current to the solenoid valve; - a switch for switching off the flow to the solenoid valve so that the solenoid valve is forced into a closed position so that the gas supply is shut off, the switch comprising a semiconductor transistor; - a control unit for controlling the switch. 2. Inrichting volgens conclusie 1, waarbij de schakelaar een Field Effect Transistor 15 omvat.The device of claim 1, wherein the switch comprises a Field Effect Transistor 15. 3. Inrichting volgens conclusie 2, waarbij de schakelaar een MESFET omvat.The device of claim 2, wherein the switch comprises a MESFET. 4. Inrichting volgens conclusie 3, waarbij de MESFET een MOSFET is. 20The device of claim 3, wherein the MESFET is a MOSFET. 20 5. Inrichting volgens conclusie 3 of 4, waarbij de MESFET een drain-source weerstand Ros(on) heeft waarvoor geldt: RDS(on)< 2mQ bij VGs > 4 V, met VGs de toegepaste spanning tussen de gate en de source van de MESFET. 2 5Device according to claim 3 or 4, wherein the MESFET has a drain-source resistor Ros (on) for which the following applies: RDS (on) <2mQ for VGs> 4 V, with VGs the applied voltage between the gate and the source of the KNIFE. 2 5 6. Inrichting volgens conclusie 1, waarbij de schakelaar een IGBT omvat.The device of claim 1, wherein the switch comprises an IGBT. 7. Inrichting volgens een of meer van de voorgaande conclusies, waarbij de besturingseenheid een timer omvat.Device as claimed in one or more of the foregoing claims, wherein the control unit comprises a timer. 8. Werkwijze voor het elektrisch bestuurd uitschakelen van een gasvlam van een gaskookelement, de werkwijze omvattend: - het openen en sluiten van een gastoevoer richting een gaskookelement door middel van een solenoïde klep; - het leveren van een stroom voor de solenoïde klep door middel van een 35 thermokoppel; - het uitschakelen van de stroom naar de solenoïde klep door middel van een schakelaar zodat de solenoïde klep in een gesloten stand wordt gedwongen zodat de gastoevoer wordt afgesloten, waarbij de schakelaar een halfgeleider transistor omvat; 5. het besturen van de schakelaar met behulp van een besturingseenheid.A method for electrically controlled switching off a gas flame from a gas cooking element, the method comprising: - opening and closing a gas supply towards a gas cooking element by means of a solenoid valve; supplying a current for the solenoid valve by means of a thermocouple; - switching off the power to the solenoid valve by means of a switch so that the solenoid valve is forced into a closed position so that the gas supply is shut off, the switch comprising a semiconductor transistor; 5. controlling the switch with the help of a control unit.
NL2004917A 2010-06-18 2010-06-18 Device and method for electrically controlled turning off of a gas flame of a gas hob. NL2004917C2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
NL2004917A NL2004917C2 (en) 2010-06-18 2010-06-18 Device and method for electrically controlled turning off of a gas flame of a gas hob.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL2004917A NL2004917C2 (en) 2010-06-18 2010-06-18 Device and method for electrically controlled turning off of a gas flame of a gas hob.
NL2004917 2010-06-18

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NL2004917C2 true NL2004917C2 (en) 2011-12-20

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022194550A1 (en) * 2021-03-18 2022-09-22 BSH Hausgeräte GmbH Gas stove
WO2022194551A1 (en) * 2021-03-18 2022-09-22 BSH Hausgeräte GmbH Gas stove

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0288390A1 (en) * 1987-04-24 1988-10-26 Chaffoteaux & Maury Security apparatus for gas valves
WO2001029483A1 (en) * 1999-10-18 2001-04-26 Pierre Repper Electronic gas cooktop control with simmer system and method thereof
US20020094498A1 (en) * 2000-08-17 2002-07-18 Jorge Rodriguez-Rodriguez Programmable burner for gas stoves
EP1394469A2 (en) * 2002-09-02 2004-03-03 RB Controls Co., Ltd. Combustion control device
EP1505344A2 (en) * 2003-08-02 2005-02-09 Siebe Appliance Controls GmbH Electric activated device to shut off the gas flame of a cooking unit
WO2009011994A1 (en) * 2007-07-16 2009-01-22 Charley Parks Energy saving cooktop
AT508263A4 (en) * 2009-11-09 2010-12-15 Anstoss Regelgeraete Ges M B H VALVE DEVICE AND METHOD FOR THERMOELECTRIC IGNITION PROTECTION FOR GAS-OPERATED DEVICES

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0288390A1 (en) * 1987-04-24 1988-10-26 Chaffoteaux & Maury Security apparatus for gas valves
WO2001029483A1 (en) * 1999-10-18 2001-04-26 Pierre Repper Electronic gas cooktop control with simmer system and method thereof
US20020094498A1 (en) * 2000-08-17 2002-07-18 Jorge Rodriguez-Rodriguez Programmable burner for gas stoves
EP1394469A2 (en) * 2002-09-02 2004-03-03 RB Controls Co., Ltd. Combustion control device
EP1505344A2 (en) * 2003-08-02 2005-02-09 Siebe Appliance Controls GmbH Electric activated device to shut off the gas flame of a cooking unit
WO2009011994A1 (en) * 2007-07-16 2009-01-22 Charley Parks Energy saving cooktop
AT508263A4 (en) * 2009-11-09 2010-12-15 Anstoss Regelgeraete Ges M B H VALVE DEVICE AND METHOD FOR THERMOELECTRIC IGNITION PROTECTION FOR GAS-OPERATED DEVICES

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022194550A1 (en) * 2021-03-18 2022-09-22 BSH Hausgeräte GmbH Gas stove
WO2022194551A1 (en) * 2021-03-18 2022-09-22 BSH Hausgeräte GmbH Gas stove

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V1 Lapsed because of non-payment of the annual fee

Effective date: 20140101