GB2103910A - Improvements in electric cookers incorporating radiant heaters - Google Patents
Improvements in electric cookers incorporating radiant heaters Download PDFInfo
- Publication number
- GB2103910A GB2103910A GB08222257A GB8222257A GB2103910A GB 2103910 A GB2103910 A GB 2103910A GB 08222257 A GB08222257 A GB 08222257A GB 8222257 A GB8222257 A GB 8222257A GB 2103910 A GB2103910 A GB 2103910A
- Authority
- GB
- United Kingdom
- Prior art keywords
- heater
- radiant heater
- pad
- glass ceramic
- 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.)
- Granted
Links
Classifications
-
- 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
- H05B1/00—Details of electric heating devices
- H05B1/02—Automatic switching arrangements specially adapted to apparatus ; Control of heating devices
- H05B1/0227—Applications
- H05B1/0252—Domestic applications
- H05B1/0258—For cooking
- H05B1/0261—For cooking of food
- H05B1/0266—Cooktops
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/68—Heating arrangements specially adapted for cooking plates or analogous hot-plates
- H05B3/74—Non-metallic plates, e.g. vitroceramic, ceramic or glassceramic hobs, also including power or control circuits
- H05B3/746—Protection, e.g. overheat cutoff, hot plate indicator
-
- 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
- H05B2213/00—Aspects relating both to resistive heating and to induction heating, covered by H05B3/00 and H05B6/00
- H05B2213/04—Heating plates with overheat protection means
-
- 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
- H05B2213/00—Aspects relating both to resistive heating and to induction heating, covered by H05B3/00 and H05B6/00
- H05B2213/05—Heating plates with pan detection means
-
- 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
- H05B2213/00—Aspects relating both to resistive heating and to induction heating, covered by H05B3/00 and H05B6/00
- H05B2213/07—Heating plates with temperature control means
Abstract
A glass ceramic top cooker has at least one radiant heater arranged beneath the glass ceramic cooking surface, the or each radiant heater comprising a continuous base layer (4) of electrical and thermal insulating material, a peripheral wall (6) also of electrical and thermal insulating material and a heating element (10) arranged on the base layer. The radiant heater also includes means, such as a pad (18), disposed on the base layer for isolating a region within the peripheral wall from heat emitted by the heating element and a temperature sensor, such as a thermocouple (20) or a platinum resistance, mounted within the isolated region so as to be sensitive in use substantially only to the temperature of a cooking pan which is heated by the heater. The temperature sensor is effective because there is created on the glass ceramic plate a cold patch through which the temperature of the pan can be determined. <IMAGE>
Description
SPECIFICATION
Improvements in electric cookers incorporating radiant heaters
The present invention reiates to electric cookers incorporating radiant heaters and more particularly relates to glass ceramic top cookers, which have one or more radiant heaters arranged beneath the glass ceramic cooking surface.
A radiant heater of a glass ceramic top cooker generally comprises a metal dish containing a base layer and a peripheral wall made of an electrically and thermally insulating material.
Arranged on the base layer is a heater element in the form of a bare helically-coiled wire which radiates heat upwardly towards and through the glass ceramic top when the heater is switched on.
The heater is protected against overheating by means of a probe-type thermal cut-out device which extends across the heater element.
It is sometimes considered desirable to control the cooking process in a utensil placed on the glass ceramic cooking surface above a particular heater by means of a temperature sensor which senses the temperature of the bottom of the utensil and which controls the energy supplied to the heating element by means of an associated control device. Such a system is often called an "autocook" system. The temperature sensor may comprise a bulb filled with an expansible fluid, which bulb is inserted through a specially formed aperture through the base of the heater and is urged against the underside of the glass ceramic plate. Alternatively, the temperature sensor may be an electro-mechanical device which is inserted through the aperture in the heater and is urged against the underside of the glass ceramic plate.
However, with a glass ceramic top cooker there is a problem because it is not possible accurately to sense the temperature of the utensil through the glass ceramic top and, additionally, the radiant heat from the heating element affects the operation of the temperature sensor.
It is an object of the present invention to provide a radiant heater and a glass ceramic top cooker in which the temperature sensor accurately senses the temperature of the cooking utensil through the glass ceramic plate.
According to one aspect of the present invention there is provided a radiant heater for an electric cooker, which heater comprises:
a continuous base layer of electrical and thermal insulating material;
a peripheral wall of electrical and thermal insulating material;
a heating element arranged on the base layer;
means disposed on the base layer for isolating a region within the peripheral wall from heat emitted by the heating element; and
a temperature sensor mounted within the isolated region so as to be sensitive in use substantially only to the temperature of a cooking pan which is heated by the heater.
According to a second aspect of the present invention there is provided a glass ceramic top cooker which includes at least one radiant heater, the heating comprising:
a continuous base layer of electrical and thermal insulating material;
a heating element arranged on the base layer;
means disposed on the base layer for isolating a region within the peripheral wall from heat emitted by the heating eiement; and
a temperature sensor mounted within the isolated region so as to be sensitive in use substantially only to the temperature of a cooking pan which is heated by the heater.
Thus, the temperature sensor is effective because there is created on the glass ceramic plate a cold patch through which the temperature of the cooking utensil can be determined.
The isolated region may be formed by a pad of insulating material. The pad may be arranged adjacent to the peripheral wall of the heater. The pad may be circular and may have a diameter of 40-50 mm. Alternatively, the pad may be partcircular at the radially inner region of the heater, but may conform to the curvature of the peripheral wall of the heater where the peripheral wall and the pad are close to one another. The pad may be made of ceramic fibre. Generally, the pad may have an area of approximately 4% to 8% of the area within the peripheral wall of the heater.
The temperature sensor may be a thermocouple and may be made for example of chromel/alumel or copper/constantan. The thermocouple wires may have a diameter of 1 mm to 2 mm. The temperature sensor may be mounted in the region of the centre of the isolated region. Alternatively, the temperature sensor may be mounted in the isolated region so as to be offset from the centre thereof towards the centre of the heater.
However, problems can still arise as a result of variations in the shapes and positions of cooking utensils. These problems may be overcome, though by providing means for determining the location of the base of the utensil relative to the glass ceramic top and by controlling the supply of electric current to a heating element of the radiant heater in response to the apparent temperature of the utensil detected by the temperature sensor and in response to the location of the base of the utensil.
The location determining means may comprise a transducer positioned in the isolated region adjacent to the temperature sensor. The transducer may be capacitative transducer.
For a better understanding of the present invention and to shown more clearly how it may be carried into effect reference will now be made, by way of example, to the accompanying drawings in which:
Figure 1 shows one embodiment of a radiant heater according to the present invention;
Figure 2 shows a part of a second embodiment of a radiant heater according to the present
invention;
Figure 3 shows a part of a third embodiment of a radiant heater according to the present invention;
Figure 4 is a diagrammatic cross-sectional view of a part of a glass ceramic top cooker according to the present invention with a utensil resting on the glass ceramic plate;
Figure 5 shows a part of a radiant heater according to the present invention with a transducer positioned adjacent to a temperature sensor;;
Figure 6 is a schematic representation of an electrical circuit incorporating the transducer and the temperature sensor; and
Figure 7 shows part of a radiant heater in which a transducer is positioned on both sides of the temperature sensor.
Throughout the figures, the same reference
numerals are used to denote the same or similar
parts.
There is shown in Figure 1 a radiant heater 1
comprising a metal dish containing a base layer 4
of electrical and thermal insulating material and a
peripheral wall 6 of electrical and thermal
insulating material. The base layer 4 is formed
with a pattern of grooves 8 and a heating
element 10 of bare helically coiled wire is secured
in the grooves, for example by means of staples
(not shown). The ends of the heating element are
connected to a terminal block 14 and in order to
prevent excessive temperatures a temperature
limiter 1 6 is arranged over the heating element
and is connected in series with the heating
element 10. The temperature limiter 1 6 may
comprise a snap-switch operated by a differential
expansion assembly in the form of an inconel rod
arranged within a quartz tube.
As illustrated in Figure 1, in place of the
conventional autocook sensor, which extends
through a hole formed in the bottom of the heater,
the hole is absent and there is provided a circular
pad 18 of electrical and thermal insulating
material, such as ceramic fibre, on which there is
arranged a temperature sensor in the form of a
thermocouple 20. The wires of the thermocouple
extend outwardly over the peripheral wall 6,
avoiding any contact with the metal dish 2 which
terminates below the level of the top of the
peripheral rim, and enter a terminal block 22. The
thermocouple is maintained in good thermal
contact with the underside of the glass ceramic
cooking surface by means of the pad 1 8.
The position and size of the pad 1 8 are
selected to isolate the temperature sensitive
portion of the thermocouple as effectively as
possible from the heat emitted by the radiant
heater and to link the thermocouple thermally to
the temperature of a cooling utensil (not shown).
In this respect, the bases of most cooking utensils
are domed to a greater or lesser extent, as will be
explained in greater detail hereinafter, so that,
while the outer region of a utensil may be in
contact with the glass ceramic cooking surface,
the central region of the utensil is generally not in
contact with the cooking surface and it is
therefore not possible accurately to determine the temperature of the utensil in the central region thereof. For this reason it is convenient to position the pad 1 8 at the periphery of the heater 1.
Whilst it is desirable, in order effectively to decouple the thermocouple 22 from the heat emitted by the heating element, to have as large a pad 1 8 as possible, a pad having too large an area is undesirable because this will produce a large cold area on the cooking surface which is detrimental to cooking performance. The optimum size of pad is thus dependent on the power rating of the heater element and on the diameter of the heated area; for a 1800 watt heating element arranged within a heated area of 1 95 mm diameter a pad of 40 to 50 mm diameter is preferable for most situations, although this may be varied in individual cases. For heaters having smaller areas, the size of the pad may be reduced accordingly.The position on the pad of the temperature sensitive portion of the thermocouple can also be important, but in most cases it is preferable to arrange this portion generally in the region of the centre of the pad.
The dimensions of the thermocouple wires may also be varied. It has been found that thicker wires promote faster cooling of the thermocouple, which enable the thermocouple to follow the temperature of the utensil more clearly once the utensil has been heated to the desired temperature. However, thicker wires take longer to heat up and so give a relatively slow response to the initial heating of the utensil. Thus, although it is possible to determine the temperature of the utensil to within 20C during steady state conditions, there will be a larger temperature difference, perhaps as much as 200 C, during the initial transient conditions. The thermocouple may be made of many materials, but copper/ constantan, and particularly chromel/ alumel, have been found to be suitable.The thermocouple wires may have, for example, diameters of from 1 to 2 mm and in some cases it may be desirable particularly in the case of thicker wires to arrange the wires in a groove on the upper surface of the pad 18.
In the embodiment shown in Figure 2, the thermocouple has been replaced by a platinum resistance 24. The platinum resistance provides greater sensitivity, but is much more expensive than the thermocouple shown in Figure 1.
In the embodiment shown in Figure 3, the circular pad has been replaced by a pad 26 which is semicircular at the radially inner region of the heater, but conforms to the curvature of the peripheral rim of the heater where the peripheral rim and the pad are close to one another. The infilling of the gaps left by a circular pad more effectively decouples the sensor from the heater, or alternatively enables a smaller pad to be used.
Although a thermocouple is illustrated in Figure 3, this is merely by way of example and any suitable temperature sensor may be provided.
A measure of the effectiveness of the construction according to the present invention is the time taken to bring a predetermined volume of water to the boil compared with other forms of heater. By comparison, the heater according to the present invention takes not more than 50% longer than the time it would take the same heater using continuous full power. However, a standard autocook heater takes several times longer than the heater according to the present invention.
The glass ceramic top cooker shown in Figure 4 comprises a radiant heater 1 arranged beneath a glass ceramic plate 2. The base of the heater is enclosed by a base plate 28, for example of sheet metal. The radiant heater 1 may be the heater shown in any one of Figures 1 to 3.
A utensil 30 rests on the upper surface of the glass ceramic plate and, as can be seen from
Figure 4, the bottom of the utensil is domed and so creates an air pocket 32 between the top of the glass ceramic plate and the bottom of the utensil. The size and configuration of the air pocket varies from utensil to utensil and therefore makes it difficult to determine the actual temperature of the utensil, and thus of the contents of the utensil, with any accuracy or consistency.
It is current practice for manufacturers of cooling pans and other utensils, to form their utensils with a slight inwardly extending dome in the base in order to enhance the stability of the utensil on the cooker. However, the dome results in the formation of the air pocket 32 between the upper surface of the glass ceramic plate and the bottom of the utensil, in which pocket the temperature of the entrapped air tends to rise significantly above the temperature of the base of the utensil. This air pocket can itself lead to a temperature sensor detecting unexpectedly high temperatures.Moreover, the problem is magnified by the fact that no two utensils are alike and thus it is not possible to provide a generalised solution to the problem because the temperature detected will vary from one utensil to the next and, indeed, will vary depending on the position of the utensil on the cooking surface.
Figure 5 shows how the radiant heater 1 may be adapted so as to overcome the problems caused by the air pocket 32. As can be seen from
Figure 5, in addition to the temperature sensor (i.e. thermocouple 20 or platinum resistance 24), there is arranged on the pad 18 a metallic plate 34. Both the temperature sensor and the metallic plate 34 are connected to a control device (not shown in Figure 5) by way of a terminal block 22.
Figure 6 shows schematically one embodiment of an electric circuit of a control device for the heater. A capacitative transducer is formed by a combination of utensil 30, thermocouple 20 (or platinum resistance 24) and the metallic plate 34.
The utensil 30 forms with the thermocouple 20 a first capacitor and the plate 34 forms the utensil a second capacitor in series with the first capacitor
Therefore, as the utensil is moved towards or away from the area of glass ceramic plate under which the transducer lies, the combined capacitance of the two capacitors formed between the thermocouple 20, the utensil 30 and the plate 34 will change. Thus, for a domed utensil, it is possible to determine the extent of the doming by electrical means and also to compensate for the effects of the doming by means of the control device.
The thermocouple 20 operates in a similar manner to a conventional autocook sensor. That is, the thermocouple 20 is intended to produce a signal, in this case an electrical signal, which is representative of the temperature of the utensil.
The signal produced by the thermocouple 20 is processed by a controller C which controls an energy regulator R which itself controls an electric switch E such as a relay, transistor, thyristor or triac to supply electrical current to the heater H.
TL represents the temperature limiter.
In addition, there is shown in Figure 6 a constant frequency generator G which generates a signal of constant, relatively high frequency of, say 1000 Hz. The signal is injected into the thermocouple 20 and is transmitted to the metallic plate 34 by way of two capacitors formed by the utensil. The metallic plate 34 is also connected to the controller C by way of a capacitor C1 and a frequency-to-voltage converter F.
As is well known, the frequency detected by the frequency-to-voltage converter F will depend on the capacitance of the components through which the signal has passed-the higher the capacitance, the lower the frequency. However, since the only variable is the spacing of the bottom of the utensil from the thermocouple 20 and the metallic plate 34, the voltage produced by the frequency-to-voltage converter is representative of the spacing between the utensil and the plate 34.
The controller C uses the signal from the frequency-to-voltage converter F to modify the control of the regulator R which is based on the signal from the thermocouple 20 in order to compensate for the inaccuracies in the apparent temperature which is detected as a result of the doming of the utensil.
Figure 7 shows an alternative configuration for the components on the pad 1 8. As can be seen from Figure 7, the thermocouple 20 (or platinum resistance) and the metallic plate 34 are provided as in the embodiment of Figures 5 and 6.
However, in addition a further metallic plate 36 is arranged on the pad 18. The capacitative transducer in this case is therefore formed between the plate 34, the utensil 30 and the further plate 36, with the constant frequency generator G being connected to the further plate 36.
Clearly, the capacitative tranducer may take many forms. For example, one plate of the capacitor need not be the thermocouple 20 or the further plate 36, but may be any other metallic component of the heater such as the dish 12 (see
Figure 7) or part of the temperature limiter 1 6.
Moreover, the metallic plates 34 and 36 need not be arranged on the pad 18, but may be fixed to the underside of the glass ceramic plate at any convenient position.
Further the transducer need not be capacitative, but may operate on any principle which gives a response which is dependent on the position or shape of the utensil. for example, the tranducer may be inductive or magnetoresistive.
Claims (20)
1. A radiant heater for an electric cooker, which heater comprises:
a continuous base layer of electrical and thermal insulating material;
a peripheral wall of electrical and thermal insulating material;
a heating element arranged on the base layer;
means disposed on the base layer for isolating a region within the peripheral wall from heat emitted by the heating element; and
a temperature sensor mounted within the isolated region so as to be sensitive in use substantially only to the temperature of a cooking pan which is heated by the heater.
2. A radiant heater as claimed in claim 1, wherein the isolated region is formed by a pad of
insulating material.
3. A radiant heater as claimed in claim 2,
wherein the pad is arranged adjacent to the
peripheral rim of the heater.
4. A radiant heater as claimed in claim 2 or 3, wherein the pad is circular.
5. A radiant heater as claimed in claim 4, wherein the pad has a diameter of 40 to 50 mm.
6. A radiant heater as claimed in claim 2 or 3, wherein the pad is part-circular at the radially inner region of the heater but conforms to the curvature of the peripheral wall of the heater where the peripheral wall and the pad are close to one another.
7. A radiant heater as claimed -in any preceding
claim, wherein the pad is made of ceramic fibre.
8. A radiant heater as claimed in any preceding
claim, wherein the pad has an area of
approximately 4% to 8% of the area within the
peripheral wall of the heater.
9. A radiant heater as claimed in any preceding
claim, wherein the temperature sensor is a thermocouple.
10. A radiant heater as claimed in claim 9, wherein the thermocouple is made of chromel/alumel or copper/constantan.
11. A radiant heater as claimed in claim 9 or 10, wherein the thermocouple wires have a diameter of 1 mm to 2 mm.
1 2. A radiant heater as claimed in any one of claims 1 to 8, wherein the temperature sensor is a platinum resistance.
13. A radiant heater as claimed in any preceding claim, wherein the temperature sensor is mounted in the region of the centre of the isolated region.
14. A radiant heater as claimed in any one of claims 1 to 12, wherein the temperature sensor is mounted in the isolated region so as to be offset from the centre thereof towards the centre of the heater.
1 5. A radiant heater for an electric cooker substantially as hereinbefore described with reference to, and as shown in Figure 1, Figure 2 or
Figure 3 of the accompanying drawings.
1 6. A glass ceramic top cooker which includes at least one radiant heater as claimed in any preceding claim.
1 7. A glass ceramic top cooker as claimed in claim 1 6 and including means for determining the location of the base of a utensil relative to the glass ceramic top and means for controlling the supply of electric current to a heating element of the radiant heater in response to the apparent temperature of the utensil detected by the temperature sensor and in response to the location of the base of the utensil.
1 8. A glass ceramic top cooker as claimed in claim 17, wherein the location determining means comprises a transducer positioned in the isolated region adjacent to the temperature sensor.
1 9. A glass ceramic top cooker as claimed in claim 18, wherein the transducer is a capacitative transducer.
20. A glass ceramic top cooker substantially as hereinbefore described with reference to, and as shown in, Figures 4, 5, 6 and 7 of the accompanying drawings.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB08222257A GB2103910B (en) | 1981-08-08 | 1982-08-02 | Improvements in electric cookers incorporating radiant heaters |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB8124324 | 1981-08-08 | ||
GB08222257A GB2103910B (en) | 1981-08-08 | 1982-08-02 | Improvements in electric cookers incorporating radiant heaters |
Publications (2)
Publication Number | Publication Date |
---|---|
GB2103910A true GB2103910A (en) | 1983-02-23 |
GB2103910B GB2103910B (en) | 1985-08-21 |
Family
ID=26280401
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB08222257A Expired GB2103910B (en) | 1981-08-08 | 1982-08-02 | Improvements in electric cookers incorporating radiant heaters |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB2103910B (en) |
Cited By (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0146215A1 (en) * | 1983-12-01 | 1985-06-26 | THORN EMI Patents Limited | Thermal limiter |
DE3519035A1 (en) * | 1985-05-25 | 1986-11-27 | E.G.O. Elektro-Geräte Blanc u. Fischer, 7519 Oberderdingen | Electrical hotplate |
US4697068A (en) * | 1985-05-25 | 1987-09-29 | E.G.O. Elektro Gerate Blanc U. Fischer | Electric cooker heating unit |
FR2609357A1 (en) * | 1987-01-05 | 1988-07-08 | Gen Electric | METHOD AND DEVICE FOR LIMITING TEMPERATURE FOR A VITROCERAMIC COOKTOP |
EP0553425A1 (en) * | 1992-01-28 | 1993-08-04 | Whirlpool Europe B.V. | Method and device for detecting the presence of a body, for example a saucepan, on a glass ceramic cooking hob in correspondence with a heating element associated with said hob |
EP0627869A1 (en) * | 1993-06-03 | 1994-12-07 | Seb S.A. | Heating element and control apparatus for a glass ceramic cooking plate |
FR2706111A1 (en) * | 1993-06-03 | 1994-12-09 | Seb Sa | Heating device for glass-ceramic hobs |
WO1998051128A1 (en) * | 1997-05-07 | 1998-11-12 | Compagnie Europeenne Pour L'equipment Menager - Cepem | Kitchen range with container detection |
GB2339475A (en) * | 1998-07-09 | 2000-01-26 | Electrovac | Temperature sensor for a cooking hob |
EP1568980A1 (en) * | 2004-02-24 | 2005-08-31 | Electrovac, Fabrikation elektrotechnischer Spezialartikel Gesellschaft m.b.H. | Temperature sensor |
US6995344B2 (en) | 2001-06-28 | 2006-02-07 | Ceramaspeed Limited | Cooking appliance |
WO2007131852A1 (en) * | 2006-05-15 | 2007-11-22 | BSH Bosch und Siemens Hausgeräte GmbH | Apparatus for controlling radiation heating elements |
WO2012076392A1 (en) * | 2010-12-07 | 2012-06-14 | BSH Bosch und Siemens Hausgeräte GmbH | Heating device for a household appliance and household appliance comprising such a heating device |
-
1982
- 1982-08-02 GB GB08222257A patent/GB2103910B/en not_active Expired
Cited By (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0146215A1 (en) * | 1983-12-01 | 1985-06-26 | THORN EMI Patents Limited | Thermal limiter |
DE3519035A1 (en) * | 1985-05-25 | 1986-11-27 | E.G.O. Elektro-Geräte Blanc u. Fischer, 7519 Oberderdingen | Electrical hotplate |
US4697068A (en) * | 1985-05-25 | 1987-09-29 | E.G.O. Elektro Gerate Blanc U. Fischer | Electric cooker heating unit |
FR2609357A1 (en) * | 1987-01-05 | 1988-07-08 | Gen Electric | METHOD AND DEVICE FOR LIMITING TEMPERATURE FOR A VITROCERAMIC COOKTOP |
EP0553425A1 (en) * | 1992-01-28 | 1993-08-04 | Whirlpool Europe B.V. | Method and device for detecting the presence of a body, for example a saucepan, on a glass ceramic cooking hob in correspondence with a heating element associated with said hob |
EP0627869A1 (en) * | 1993-06-03 | 1994-12-07 | Seb S.A. | Heating element and control apparatus for a glass ceramic cooking plate |
FR2706110A1 (en) * | 1993-06-03 | 1994-12-09 | Seb Sa | Method and circuit for regulating heating elements |
FR2706111A1 (en) * | 1993-06-03 | 1994-12-09 | Seb Sa | Heating device for glass-ceramic hobs |
WO1998051128A1 (en) * | 1997-05-07 | 1998-11-12 | Compagnie Europeenne Pour L'equipment Menager - Cepem | Kitchen range with container detection |
FR2763116A1 (en) * | 1997-05-07 | 1998-11-13 | Europ Equip Menager | COOKING FIREPLACE WITH DETECTION OF A CONTAINER |
GB2339475A (en) * | 1998-07-09 | 2000-01-26 | Electrovac | Temperature sensor for a cooking hob |
GB2339475B (en) * | 1998-07-09 | 2002-12-18 | Electrovac | Temperature sensors |
US6995344B2 (en) | 2001-06-28 | 2006-02-07 | Ceramaspeed Limited | Cooking appliance |
EP1568980A1 (en) * | 2004-02-24 | 2005-08-31 | Electrovac, Fabrikation elektrotechnischer Spezialartikel Gesellschaft m.b.H. | Temperature sensor |
US7214909B2 (en) | 2004-02-24 | 2007-05-08 | Electrovac, Fabrikation Elektrotechnischer Spezialartikel Ges.M.B.H. | Temperature sensor |
WO2007131852A1 (en) * | 2006-05-15 | 2007-11-22 | BSH Bosch und Siemens Hausgeräte GmbH | Apparatus for controlling radiation heating elements |
WO2012076392A1 (en) * | 2010-12-07 | 2012-06-14 | BSH Bosch und Siemens Hausgeräte GmbH | Heating device for a household appliance and household appliance comprising such a heating device |
Also Published As
Publication number | Publication date |
---|---|
GB2103910B (en) | 1985-08-21 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US4447710A (en) | Electric cookers incorporating radiant heaters | |
EP0481162B1 (en) | Domestic cooking apparatus | |
US5270519A (en) | Radiant heater having multiple heating zones | |
US4414465A (en) | Cooking apparatus | |
US5352864A (en) | Process and device for output control and limitation in a heating surface made from glass ceramic or a comparable material | |
US6555793B2 (en) | Advanced radiant electric heater | |
GB2103910A (en) | Improvements in electric cookers incorporating radiant heaters | |
US6046438A (en) | Thick film heating element with thermal sensor disposed in thinner part of substrate | |
JPH0658554A (en) | Method and device for indicating abnormal thermal stress state in heating surface manufactured from glass ceramic or similar material | |
JP5128589B2 (en) | Home appliances for liquid heating | |
US6552307B2 (en) | Temperature detection device for an electric radiant heater | |
KR20040026150A (en) | Radiant electric heater incorporating a temperature sensor assembly | |
EP1400151B1 (en) | Cooking appliance | |
JP3351849B2 (en) | Electric heating device for cooking range | |
EP1488666B1 (en) | Electrical heating assembly | |
EP1345473A2 (en) | Electrical heating assembly for a cooking appliance with temperature sensing means | |
FI91476C (en) | Temperature controlled hotplate | |
JPH03122992A (en) | Induction heting cooking apparatus | |
KR20060098365A (en) | Method of controlling boiling level | |
GB2218605A (en) | Control means for an electric heater unit for an electric ceramic hob | |
GB2225920A (en) | Controlling an electric heater unit for an electric ceramic hob | |
EP3883340A1 (en) | Cooking assembly and method for operating such cooking assembly | |
US20210029783A1 (en) | Radiant heating device and hob comprising a radiant heating device of this kind | |
JP2639030B2 (en) | Induction heating cooker | |
JP4231803B2 (en) | Induction heating cooker |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 20000802 |