Electric heating – Heating devices – With power supply and voltage or current regulation or...
Patent
1997-10-01
1999-09-14
Paschall, Mark
Electric heating
Heating devices
With power supply and voltage or current regulation or...
219494, 219501, 219435, 219431, 340870A, 341176, 99330, H05B 102
Patent
active
059519002
DESCRIPTION:
BRIEF SUMMARY
The automatic temperature measurement based power control device, preferentially on the pot led, allows for are or wireless selective power control of one or more power sources through identification of the controlled power source, as well as for the accordingly surveyed food preparation foiling the pre-sea programme. The invention has been classified into the F 24C 07/08 and G 05D 23/00 classes of the international patent classification.
The technical problem successfully solved by the device in question involves the design and the construction of the device that will enable pre-set and in-process supervised operation of one or more power sources, such as electric healers, gas heaters, microwave heaters etc. at thermal food processing (cooking, roasting etc.), depending on temperature changing, measured on the lid of the pot where the food is prepared.
There are several known solutions relating to the in-process food preparation control. With pots provided for cooking and roasting on electric and gas heaters of those cooking utensils which due to the cooking technology require the use of the lid, visual checking of the situation in the pot without lifting the lid is impossible, except in case of transparent lids. The cooking or roasting process itself is very sensitive to opening of lids because of vapour and power loss, in particular in cooking processes Without addition of water and/or oil. Well known temperature is control solutions consist of bimetallic and digital thermometers mounted in the lid handle. The heater power level is subject to manual control with reference to the visual information or acoustic signal provided by such devices.
There are also known power level control solutions in the heater itself; they are based on the information on the heater temperature or on the pre-set power changes in the time function. This control type is not precise enough, because the power required for food preparation depends on the size of the pot, on the water quantity, on the food quantity and type, on the room temperature as well as on other factors. In addition to many interdependent parameters, a serious problem is imposed by manual power control which mainly depends on the person and his/her qualification as well as on the controller type and precision. During the operation the attending person shall be constantly present, either watching the bimetallic thermometer or staying somewhere near to be able to hear the acoustic signal produced by the instrument. The respective temperature setting at which the instrument will produce the acoustic signal depends of the attending person and the correct setting is a matter of its experience. Useless power losses are significant and the quality of the device depends on man.
There is a known solution, described in the German patent document DE 2909129, where a special sensor on the lid of the pot allows for temperature measurement on the lid as well as for heater power control by a combination of ultrasonic transmitter & receiver, accompanied by time measurement. The problem not satisfactorily solved by the above solution involves control accuracy and assurance of process continuity; besides, the device is only useful for a certain power location.
The patent document DE 4422354 describes cooking control through infrared pot temperature measurement. Such control depends on the type of the pot used and it requires a specially treated heating plate.
The patent document DE 3836099 describes the system where a special measuring probe takes the temperature inside the cooking pot and, on the basis of the measured values, controls the power supply circuit of the heating spiral. The system allows for control of an exactly specified power source and is not applicable for bigger power sources located at shorter distances.
In addition to the above solutions the described technical problem has been solved by means of special custom designed cooking pots that include both sensor and power elements and have been designed for surveyed food preparation. Such solutions are describe
REFERENCES:
patent: 3828164 (1974-08-01), Fischer et al.
patent: 4535229 (1985-08-01), Wolf et al.
patent: 4740888 (1988-04-01), Ceste, Sr. et al.
patent: 5321229 (1994-06-01), Holling et al.
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