JPS618893A - High frequency heater - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is a high-frequency cooking device that uses high-frequency energy, in particular, that uses a program control function of a microcomputer (hereinafter abbreviated as microcomputer) to automatically control the defrosting output and defrosting time of food. This invention relates to a high-frequency cooker that allows settings.

Conventional Structure and Problems In recent years, with the spread of refrigerator-freezers and the development of frozen foods, frozen foods have become increasingly popular in our diets. There are various ways to defrost these frozen foods, such as natural defrosting and refrigerator defrosting, but it is well known that dielectric heating of a high-frequency cooker using high-frequency energy can defrost food quickly and quickly. ing. However, when using a high-frequency cooker, there may be uneven thawing due to the uneven distribution of the high-frequency cooker, or if a part of the food is thawed first, there will be a large difference in the dielectric loss rate of water and moisture.・Due to this change, radio waves concentrate in the thawed area, causing that area to heat up further and cause it to boil.

In order to solve this drawback, conventional high-frequency cookers employ a method of lowering the high-frequency output to around 200 W when defrosting, and increasing the heat to a so-called low heat to proceed with defrosting.

However, simply lowering the high frequency output to around 200 W is not a sufficient solution, and the speed cooking that is a feature of high frequency cookers cannot be utilized. Furthermore, the user cannot easily determine the defrosting output and time depending on the type of food and the weight of the food, which sometimes causes inconvenience.

Purpose of the Invention The present invention is intended to solve the above-mentioned conventional drawbacks, and aims to provide rapid and appropriate defrosting performance by providing an appropriate defrosting sequence depending on the type and weight of the food. shall be.

Structure of the Invention In order to achieve the above object, the high-frequency cooking device using high-frequency energy of the present invention is equipped with a switch that intermittents high-frequency output, and a microcomputer that controls the intermittent cycle, thawing output and time according to the weight of food. It consists of a control section and an operation section for setting the weight of the food, and by setting the total weight of the food, it is possible to defrost properly and quickly according to the set microcomputer program.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows an external view of the present invention. Reference numeral 1 denotes a main body of a high-frequency cooking device, and a heating chamber 2 is provided within this main body 1. A stirrer and a turntable (not shown) are provided in the heating chamber 2 in order to make the radio wave distribution more uniform and improve the finish 9 of the food. 3 is a door that can be opened and closed at the opening of the heating chamber 2, and switches 31, 32, 33, and 34 that are linked to the opening and closing of the door are provided.
(By opening and closing, it functions to stop the high frequency energy and to provide an input signal to the operation unit 4. 4 is the main body 1
The operation section provided on the front is used to transmit the weight of the food and a start signal, and also to manually set the defrosting time, output, etc. A control section 5 equipped with a microcomputer 5a is provided within the operation section 4. Based on the input information to the microcomputer 5a given by the cage operation section 4, the thawing output time is calculated, and the switch 7 is driven to control the cooking time and cooking sequence.

FIG. 2 shows a circuit diagram of an embodiment of the present invention. A magnetron 6 is provided as a high-frequency oscillator, and a switch 7 is provided for turning on and off the power of a transformer 8 that supplies power to the magnetron 6 to change the high-frequency output. The switch 7 can repeat predetermined opening/closing operations according to a control sequence controlled by the microcomputer 5a of the control section 5. As a third factor, a sequence diagram of an embodiment of the present invention is shown. The defrosting sequence of one embodiment of the present invention has a total defrosting time T obtained by a factor proportional to the set weight. The total defrosting time ff is calculated and divided equally into 1/3, and the switch 7 is turned on and off according to the divided time T, and the programmed high frequency output P, '+ p2. P3 is obtained, and time T1 is further divided into 1/8, and T when there is a predetermined high frequency output and T when magnetron 6 is not oscillating.
The switch 7 is configured to repeat intermittent opening and closing operations so as to alternately obtain the high frequency output "o".

The operation of the above configuration will be explained below.

When the object to be thawed and its weight are entered into the heating chamber 2 and the weight is inputted from the operating section 4, the microcomputer 5a of the control section 5 obtains this information, calculates the thawing output and thawing time according to the set program, and then calculates the thawing output and thawing time. Each time T is stored as a divided time t71.

In order to obtain a high-frequency output that has already been set according to the stage of the operation, the switch 7 starts to switch on and off, and the microcomputer 5a starts controlling the defrosting sequence. In the stage of each time T, the program is such that the time T1 is divided into eight, and the high frequency output set every 1A time and the high frequency output tr-on are alternately repeated.

Now, to explain the thawing situation within time T1, when the food to be thawed is heated by dielectric heating using high-frequency energy, since the food is frozen, most of its moisture is frozen, and the dielectric constant of ice is high, so the high frequency energy is
It cannot penetrate deep into the material to be thawed, and is digested only on the surface of the material to be thawed, resulting in heating only the surface. Next, when the high-frequency cover reaches time T, the thermal energy that has been partially or completely heated by dielectric heating within 1/F3 hours will be transferred to the surrounding non-heating area due to its heat transfer action. The temperature of the thawed portion is increased, and the local heating of the thawed portion is gradually averaged to the temperature of the entire press, which is transmitted to the inside of the food.

In the present invention, by repeating this four times, the added heat energy gradually raises the temperature to the inside of the food.
This completes the first stage.

In the next second stage, in order not to cook the part that has already started thawing in the first stage, the entire T1 time is divided into eight parts at a lower output than the first stage, and the set high frequency output is set. and I high frequency output "O" are repeated and further penetrate into the inside of the food in order to proceed with thawing, and in the third stage, the first.
The decompression sequence is completed after the time T elapses with a high frequency output lower than that of the second stage, and the decompression sequence is completed. Now, the heat generated when heated according to the high frequency output set at each stage is output as a high frequency output.
``At times, heat is transferred to other low temperature or unfrozen parts, and the thermal energy is < 9. When heating with high frequency energy, the high frequency output'' is repeated several times, and further internal heat transfer of the added thermal energy occurs. As the decompression progresses, the set high frequency output is gradually lowered, and this step is also repeated to perform stable decompression.

In this way, according to this embodiment, compared to the conventional defrosting method that uses only one type of high-frequency output, the thermal energy generated by dielectric heating of high-frequency energy is intermittent in high-frequency output, and when the high-frequency output is Radio wave distribution, which is a drawback of high-frequency heaters by transmitting heat to the interior and low-temperature parts and averaging the overall temperature 5 K, K Z 1aEf 41! l H″″−““
1-°5- Prevents the food from progressing from the thawing stage to the cooking stage due to excessive thawing, allowing for more uniform thawing. As a result, in the past, the high-frequency output was lowered to around 200 W, resulting in a longer thawing time, but in this example, the high-frequency output was reduced to around 400 W due to the heat transfer effect of the accumulated high-side energy. The total thawing time can be shortened, and at the same time, the actual high-frequency energy is reduced, and by incorporating power consumption and utilizing heating (heat transfer effect), energy savings can be practically halved. ing. In addition, because it has become possible to defrost more uniformly, a simple linear formula (T
=a w+b ) has the effect that a decompression sequence can be assembled.

Effects of the Invention As described above, according to the present invention, the following effects can be obtained.

(1) By providing a section where the high-frequency output is "o", the high-frequency energy that has been accumulated in the food is transferred to the inside of the food and to a low temperature, and the temperature of the food is averaged. At the same time, it is possible to partially decompress the material, and when the next high-frequency energy is applied, it is completely absorbed over a wide range, thereby reducing absorption unevenness due to differences in dielectric constant. Furthermore, by repeatedly interrupting the time when high-frequency energy is applied and the time when the temperature is 0°, the internal thawing of the food progresses more easily, and it is possible to prevent boiling if only the surface of the food is thawed. This results in more uniform thawing.

(2) As mentioned above, by using a strong high-frequency output at the beginning without worrying about boiling the surface, and gradually changing the high-frequency output used as the thawing progresses, stable thawing can be obtained and You can save time and keep food fresh. At the same time, by shortening the time and providing a section where the high frequency output is provided as described above, the amount of consumed power is halved, contributing to energy saving.

(3) In the defrosting device mentioned above, it is possible to set the high frequency output and each time according to the weight of the food, regardless of the type of food, and it is possible to automatically set the high frequency output and each time according to the weight of the food. You can unzip it. This saves the user the trouble of creating a cooking manual or a program that corresponds to the type and amount of food. By combining these, the ROM capacity of the microcontroller can be reduced, programs can be simplified, other specifications can be improved, and flexibility in microcontroller program design can be achieved, such as the ability to switch to a smaller-capacity, cheaper microcontroller. can be raised.

[Brief explanation of the drawing]

FIG. 1 is an external view of an embodiment of the present invention, FIG. 2 is a circuit diagram of an embodiment of the present invention, and FIG. 3A. B and C are operation explanatory diagrams, and FIG. 4 is a flowchart of the same. 1...Main body, 2...Heating chamber, 3...
...Door, 4...Operation unit, 5a...Microcomputer, 6...Magnetron, 7...
switch. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 3 (A) (B)

Claims (3)

[Claims] (1) A heating chamber that accommodates food, a high-frequency oscillator that supplies high-frequency output to the heating chamber, a control circuit device that includes a microcomputer that has a program function and controls the high-frequency output of the high-frequency oscillator, and the high-frequency oscillator. The microcomputer divides the heating time into two or more parts proportional to the weight of the food, and further divides each divided heating time into two or more times when high frequency output is present and when there is no high frequency output. A high-frequency heating device that is equipped with a program that divides into multiple equal parts and repeats them alternately. (2) The high-frequency heating device according to claim 1, comprising a program that reduces the high-frequency output in accordance with the operating order of the divided heating times during the divided heating times that are proportional to the weight of the food. . (3) Divide the heating time proportional to the weight of the food into two or more equal parts, let the divided heating time be T, a and b are constants, and w
The high-frequency heating device according to claim 1, comprising a program expressed as T=aw+b, where T=aw+b is the weight of the food.