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Title:
INTELLIGENT POWER MANAGEMENT IN COOKING DEVICE CONTROL SYSTEMS
Document Type and Number:
WIPO Patent Application WO/2012/134412
Kind Code:
A2
Abstract:
The present invention is a method for implementing the intelligent power management systems, which allows controlling and limiting power drawn from the mains or alternative energy sources, to the electric cooking devices (1), wherein said method provides the following: allows using heating elements (2) of the electric cooking device (1) at full-power as long as the power limitation level is not exceeded; maintains power of the lastly selected resistance constant and decreases the power of the other hot plates when the limitation level is exceeded.

Inventors:
AKAR, Mustafa (10006 Sk. No:64 Ataturk Organize Sanayi Bolgesi, Çigli, Izmir, TR)
Application Number:
TR2012/000054
Publication Date:
October 04, 2012
Filing Date:
March 16, 2012
Export Citation:
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Assignee:
EN-KO ELEKTRONIK KONTROL SISTEMLERI SANAYI VE TICARET LIMITED SIRKETI (10006 Sk. No:64 Ataturk Organize Sanayi Bolgesi, Çigli, Izmir, TR)
AKAR, Mustafa (10006 Sk. No:64 Ataturk Organize Sanayi Bolgesi, Çigli, Izmir, TR)
International Classes:
H05B1/02
Domestic Patent References:
WO2008067999A12008-06-12
Foreign References:
DE29701430U11998-03-05
EP1018793A22000-07-12
EP0844807A11998-05-27
Other References:
None
Attorney, Agent or Firm:
DESTEK PATENT, INC. (Konak Mah. Lefkose Cad. NM Ofis Park B Blok No: 36 / 5 Besevler Nilufer, Bursa, 16110, TR)
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Claims:
CLAIMS

1- Method for implementing the intelligent power management systems, which allows controlling and limiting power drawn from the mains or alternative energy sources, to the electric cooking devices (1), wherein said method provides the following:

allows using heating elements (2) of the electric cooking device (1) at full-power as long as the power limitation level is not exceeded;

controls power consumption of active heating elements (2) proportionally when the limitation level is exceeded.

2- Method according to claim 1 , wherein the last level value of the heating element (2) selected by the user is maintained throughout the period.

3- Method according to claims 1 and 2, wherein the last level values of the heating element (2) is maintained by said method while the level values of the other heating elements (2) are changed automatically within the period.

4- Method according to claim 3, wherein changing level values are displayed on a monitor provided on the electric cooking device (1).

5- Method according to claims 1 to 4, wherein the power consumption of several or all heating elements (2) does not exceed the limited power.

Description:
DESCRIPTION

INTELLIGENT POWER MANAGEMENT IN COOKING DEVICE CONTROL SYSTEMS FIELD OF THE INVENTION

The invention relates to limiting the energy drawn from electrical installation by electric stoves used in kitchens.

Particularly, the invention relates to intelligent power management system developed for ensuring operation of the stove at desired efficiency when the electrical installation in buildings does not permit the use of the stove at full-power or becomes insufficient.

PRIOR ART

Today, electrical energy is increasingly employed for the stoves used in the kitchens. However, electrical energy used in these electric stoves is at very high power. Thus, the use of electric cooking devices together with different electric powered devices causes drawing more power from the installation and puts strain on the installation. This situation causes the fuses to blow or damages the installation over time and leads to melting of the cables and may result in dangerous consequences.

Development of an equipment integrated system that will limit the energy in required cases by detecting the power used in cooking devices is costly for the manufacturer.

In conclusion, the need for a method, which eliminates the drawbacks existing in the prior art and provides maximum power drawing from the electrical installation by limiting the power drawn from said installation and insufficiency of the existing solutions made the development in the respective technical field necessary.

PURPOSE OF THE INVENTION

The present invention relates to a method, which meets the aforementioned requirements, eliminates all the drawbacks, brings additional advantages, is referred to as intelligent power management system and enables maximum power drawing by limiting the power drawn from the electrical installation. Following are the advantages of the application of intelligent power management system in cooking device control systems for the product user:

-Enables limiting the power drawn from the installation when the user desires to operate the product at power levels that are not appropriate for the existing energy infrastructure and prevents potential hazards;

-Allows for saving energy by providing power limitation.

The application of intelligent power management system in cooking device control systems allows the manufacturer to produce cooking devices without power limitations. Following are the reasons as to why manufacturers limit the power of the cooking devices:

-The use of cooking devices such as stove, oven, etc. is possible within certain power limits depending on the local and regional infrastructure;

-The companies offering the use of the devices as a service desire to limit the energy used by said device, drawn from their installation;

-The operation of units used in the manufactured device is possible within a certain power limit.

The present invention is an implementation method of the intelligent power management systems, which allows controlling and limiting power drawn from the mains or alternative energy sources, to the electric cooking devices for the purpose of providing all the advantages, which are explained above and will be understood from the detailed description given below, wherein said invention provides the following:

-allows using heating elements of the electric cooking device at full-power as long as the power limitation level is not exceeded;

-controls power consumption of active heating elements proportionally when the limitation level is exceeded.

In a preferred embodiment of the invention, the last resistance level value selected by the user is maintained throughout the period.

In a preferred embodiment of the invention, the last resistance level value is maintained by said method while the level values of the other resistances are changed automatically within the period. In a preferred embodiment of the invention, changing level values are displayed on a monitor provided on the electric cooking device.

The structural and the characteristic features and all advantages of the invention will be understood more clearly with the detailed description written by referring to the following figures and therefore the evaluation needs to be done by taking these figures and the detailed description into consideration.

BRIEF DESCRIPTION OF THE FIGURES

Embodiment of the present invention and advantages thereof with the additional components must be considered together with the figures explained below in order to be fully understood.

Figure 1 : Shows representational view of a stove.

Scaling of drawings is not absolutely required and details, which are not needed for understanding the present invention can be neglected. Furthermore, elements, which are at least substantially identical or have at least substantially identical functions, are indicated with the same number.

REFERENCE NUMBERS OF PARTS GIVEN IN FIGURES

1. Cooking device

2. Heating element (Resistance)

DETAILED DESCRIPTION OF THE INVENTION

Power is limited electronically for the purpose of being able to use the stove when the electrical installation of the building falls short and doesn't permit the use of said electric stove operate at full-power. Thus, electric stoves with glass-ceramic surface coating can be used in all the buildings thanks to this power limitation.

Intelligent power management is drawing maximum power from the installation by means of the following:

-controlling the desired power according to the needs of the user;

-limiting this power when required. Intelligent power management system's area of utilization is the high power cooking devices (1) range where oven, stove and combination thereof can be used. When said intelligent power management system is applied to the stove range, power limitation can be provided individually to the stove range as well as to the range of products where the stove and oven used together. Power management can be performed in the double product range by means of said system, however, in this case, a hardware structure providing detection of the oven is used in addition to power management algorithm.

The stoves used in the kitchens generally comprises hot plates, positioned in three or four areas and referred to as radiant heaters. Some electrical installations are not sufficient for the operation of all the radiant heaters provided on the stove comprising four radiant heaters. In this case, either all of the radiant heaters should not be used at the same time or total power of the stove should be selected to be a lower value. When a low total stove power is selected heating or cooking process takes too long due to the low power given to the radiant heater. Thus, heating or cooking can not be done with desired duration and performance. This situation is avoided by means of power limitation and it enables radiant heaters to be used at maximum power as long as the power limit is not exceeded. When the maximum power is exceeded the power consumed by radiant heaters other than the ones used by the user is dropped down taking the power level preference of the user into account.

Power limitation applied to vitroceramic stoves by means of said method is carried out with electronic cards. In vitroceramic stoves, heating or cooking processes are done by means of the resistances (2) provided therein, because said stoves doesn't have burners like the standard stoves.

Different sized resistances (2) used in said stoves carry out the functions of large, medium or small sized stove heads provided in standard stoves. The power of different diameter resistances (2) used in vitroceramic stoves are also at different levels.

Diameters of the heaters (2) are selected differently for heating with appropriate diameter resistance (2), because base diameters of the equipments such as pan, coffee pot, etc. used by the user are different from each other. Thus, efficiency is provided by means of using resistances (2) with different diameters and power.

An embodiment for application of intelligent power management to the cooking devices ill: Figure 1 shows a representational view of a stove. In this stove, resistances (2) having three different diameters, hence different power are used in four different regions. Power values of the resistances (2) given in the example are used for describing the operation of the method without limiting the invention. Said numeric values such as power values, period duration can be different in different applications.

Power values of the resistances (2) based on size thereof at 240 V, AC mains voltage:

Small diameter: 1200 W

Medium diameter: 1800 W

Large diameter: 2300 W

Said stove is provided with two small, one medium and one large diameter resistance (2). Thus, total power of the stove at 240 V AC mains voltage is 6500 W.

All the heaters (2) can be turned on and off by means of electronic control card and heaters (2) are able to provide heating process at desired level. Resistances (2) used as heater are controlled by means of relay. Relay is a circuit element operating when current flows therethrough and can be used as an electrical switch, enabling opening and closing of the electric circuit. Thus, the level value selected by means of electronic card shows the duration by which the relay will have energy within the specified period. Said period is 40 seconds for this embodiment. Engagement duration of the heater (2) based on the selected level are as follows:

-Level 0: 0 sec

-Level 1 : 1.2 sec

-Level 2: 2.8 sec

-Level 3: 4.4 sec

-Level 4: 6 sec

-Level 5: 10 sec

-Level 6: 14 sec

-Level 7: 20 sec

-Level 8: 28 sec

-Level 9: 40 sec

Based on the above, when the heater (2) is desired to be operated at level 6, current flows through the relay controlling said heater (2) for 14 sec. Relay receives energy for 14 sec during the 40 second period and doesn't receive any energy for the remaining 26 sec. Heater (2) is heated with the energy given for 14 sec at level 6 and then, said heater (2) provides the heating process with this energy until the end of 40 second period. Subsequently, current again flows through the relay once the 40 second period is completed and heater (2) is again heated for 14 sec with the energy from the system. The heating process with such a cycle continues until it is finished for any reason or until the level is changed.

The stove with given power values consumes a power of 6500 W when all the heaters (2) are operated at the same time at level 9 by the user. A power limitation is performed according to the heater (2) features of said cooking device (1) when power consumption of 6500 W is preferred.

For example, when power limitation is to be carried out with two different stoves having heaters (2) working at different power at 220 V and 240 V AC mains voltage, heaters (2) operate as follows:

Table 1. Exemplar information is given to apply the method to an oven.

S: Small diameter heater (2)

L: Large diameter heater (2)

Small diameter heater (2) operates at 1008 W at 220 V mains voltage;

and at 1200 W at 240 V mains voltage.

Large diameter heater (2), single, operates at 1513 W at 220 V mains voltage;

and at 1800 W at 240 V mains voltage.

Large diameter heater (2), double, operates at 1428 W at 220 V mains voltage; and at 1700 W at 240 V mains voltage.

In the table above, final selection feature, number of resistances (2) used and power limitation level are given. Final selection feature specifies whether the selection by the user will be maintained constant or not.

Two small and two large resistances (2) are used on the stove in Model 1. In this case, the power drawn from the installation is 5024 W at 220 V AC supply when no power limitation is applied.

In the case of power limitation at 3000 W, only two large resistances (2) are allowed to operate. The algorithm performing the power limitation starts the controls after the user selects the hot plates and adjusts the level. All resistances (2) for Model 1 can be operated until level 7.

As the operating period for level 7 is 20 seconds, it corresponds to half of the total operating period. Out of the resistances (2) provided on the stove, one large and one small resistance (2) are operated during the first 20 second half period while the other large and small resistances (2) are operated in the other half period. In this case, the instantaneous power drawn becomes 2521 W, which is below the desired limitation value of 3000 W.

However, the power has to be limited if one of the small resistances (2) is operated when two large diameter resistances (2) operate at a level higher than level 7. In this case, power limitation is done by keeping the level of the hot plate, selected lastly by the user, constant if said model has final selection feature. For example, if all the resistances (2) are selected to operate at level 9 by the user and lastly set resistance (2) is one of the small resistances (2), the lastly selected resistance (2) continues to operate at level 9. One of the large resistances (2) operates at level 7 and the other one at level 6 while the other small resistance (2) operates at level 4. The important point is that the level value of the resistance (2) selected lastly by the user is maintained and nearest desired power value from the stove is drawn.

After the determination of the power limitation value, the operation time periods of resistances (2) in the time scale are determined and levels are changed automatically by taking total duration of 40 seconds, operating durations by level and maximum power drawing into consideration. Changed level value is displayed to the user by a screen provided on the stove.

If intelligent power management is applied to said stoves and final selection feature exists, lastly selected resistance (2) operates for 40 seconds at the set level, namely at level 9. The level values of the other resistances (2) are changed within the period by the algorithm according to the invention. For example, in the case that one of the large resistances (2) is active at level 7 together with the lastly selected small resistance (2), current flows through the relay of the large resistance (2) for 20 seconds, throughout the half period. Then, when this relay, serving as switch, closes, said resistance (2), with the energy given during the first 20 seconds, continues to heating and cooking processes until the end of 40 second period. Subsequently, the other large resistance (2) operating at level 6 engages and said resistance (2) draws power from the mains for 14 seconds. It continues heating for the remaining 26 seconds of the period with the energy given to it. The large resistance (2) operating at level 4 draws energy from the mains within the last 6 seconds of the period.

In the case that final selection feature is not active and the lastly selected resistance (2) is one of the large diameter resistances (2), said large resistance (2) continues to operate for 40 seconds throughout the period. Meanwhile, the other resistances (2) engage and operate at certain segments of the period and continue to operate at levels set out by the algorithm such that they remain below the power limitation level. Thus, all the resistances (2) can be utilized by the user.

In conclusion, electric cooking device (1) according to the invention controls the power consumption of the heating elements (2) proportionally depending on the power drawn from the mains or another alternative power source (generator, battery, etc.). In other words, it can decrease or increase power consumption of the heating elements (2) depending on the number of heating elements (2) used. By this means, allocation of the limited power drawn from the mains or power source between the active heating elements (2) is provided.