JPH05840B2 - - Google Patents

Description

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

Configuration of conventional examples and their problems In recent years, with the spread of refrigerator-freezers and the development of frozen foods, frozen foods are increasingly being utilized in dietary habits. 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 be used to defrost food quickly and in a short time. There is. However, when using a high-frequency cooker, there may be uneven thawing due to uneven distribution of the high-frequency cooker, or if a part of the food is thawed first.
Due to the large difference and change in the dielectric loss factor between ice and water, radio waves concentrate in the thawed area, causing that area to further heat up and boil. To solve this problem, conventional high-frequency cookers lower the high-frequency output to around 200W when defrosting food, and use a method that allows defrosting to proceed over low heat.

However, simply lowering the high frequency output to around 200W was not a sufficient solution, and it was not possible to take advantage of the speed cooking that is a feature of high frequency cookers. 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 thawing performance by providing an appropriate thawing sequence depending on the type of food and the 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 provided with a switch that intermittents high-frequency output, and a microcomputer that controls the intermittent cycle and the defrosting output and time according to the weight of the food. Consists of a control section and an operation section for setting the weight of the food.By setting the weight of the food,
Appropriate and quick decompression can be performed 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 of the food. Reference numeral 3 denotes a door provided at the opening of the heating chamber 2 that can be opened and closed, and switches 31, 32, 33, and 34 that are linked to the opening and closing of the door. It functions as an input signal. Reference numeral 4 denotes an operation section provided on the front of the main body 1, which transmits the weight of the food and a start signal, and also manually sets defrosting time, output, etc. A microcomputer 5 is installed in the operation section 4.
A control section 5 is provided, which calculates the defrosting output time based on input information from the microcomputer 5a given from the operation section 4, and drives the switch 7 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 and closing operations according to a control sequence by the microcomputer 5a of the control section 5. FIG. 3 shows a sequence diagram of an embodiment of the present invention. In the defrosting sequence of one embodiment of the present invention, the total defrosting time _T0 obtained by a coefficient proportional to the set weight is calculated, the total defrosting time is equally divided into 1/3, and according to the divided time _T1 , Switch 7 is switched on and off to obtain programmed high frequency outputs P ₁ , P ₂ , P ₃ , time T ₁ is further divided into 1/8, and when the predetermined high frequency output is present, T ₁₁ and magnetron 6 are not oscillating. The switch 7 is configured to repeat intermittent opening and closing operations so that the high frequency output "O" at time _T12 can be obtained alternately.

Here, the method of outputting the high frequency outputs P ₁ , P ₂ , and P ₃ will be explained. As mentioned above, the output time of each high frequency output is T ₁ , and each output stage of this T ₁ time is further set to 1/8, and when a predetermined high frequency output is present, T ₁₁
And when there is no high frequency output, it is divided into T ₁₂ . The difference between the high frequency outputs P ₁ , P ₂ and P ₃ is determined by the difference in the high frequency output of T ₁₁ when this high frequency output is present. That is, when the high frequency output is present, _T11 is further divided into a time when the high frequency is oscillated and a time when the high frequency is not oscillated. P ₁ has the longest period of high frequency oscillation, P ₂ is the second, and P ₃ has the shortest period of high frequency oscillation. For example, high frequency output
For P ₁ , high frequency is oscillated for 80% of T ₁₁ time,
In the case of the output P ₂ , the high frequency is oscillated for 40% of the time T ₁₁ , and in the case of the output P ₃ , the high frequency is oscillated for 20% of the time T ₁₁ . Setting the time during which such a high frequency is oscillated, i.e., P ₁ ,
P ₂ and P ₃ are intermittent outputs that were already set in the program before the weight was set, and they operate at cycles unrelated to the weight.

The operation of the above configuration will be explained below.

When the object to be thawed is placed in the heating chamber 2 and its weight is keyed in 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. The divided parts are stored as T ₁ hours, and each time T ₁
In order to obtain a high-frequency output that has already been set according to the stage of , the switch 7 starts intermittent operation, and the microcomputer 5a starts controlling the defrosting sequence. In the stage of each time _T1 , the program is such that _T1 time is divided into 8 parts and the high frequency output set every 1/8 hour and the high frequency output "O" are alternately repeated.

Now, I will explain the thawing situation within T ₁ hour.

When the food to be thawed is heated by dielectric heating using high-frequency energy, most of the moisture in the food is frozen, and the dielectric constant of ice is high. It cannot penetrate and is digested only on the surface of the thawed object, heating only the surface. Next, high frequency output “O”
When T ₁₂ is reached, the thermal energy that has been partially or completely heated by dielectric heating within 1/8 hour will then increase the temperature of the surrounding unfrozen area due to its heat transfer action. By gradually thawing the food, the local heating of the thawed portion is averaged over the entire temperature of the presser foot, and is transmitted to the inside of the food.
In the present invention, by repeating this four times, the temperature is gradually raised to the inside of the food using the added thermal energy, thereby completing the first stage.

In the next second stage, be careful not to cook the parts that have already started thawing in the first stage.
At a lower output than the first stage, T ₁ hour is divided into 8 parts as in the first stage, and the set high frequency output and high frequency output "O" are repeated, allowing heat to penetrate inside the food and thawing. , in the third stage, thawing is performed for T ₁ hour in the same manner as described above with a high frequency output lower than that in the first and second stages,
Finish the decompression sequence. Now, the heat generated when heated according to the high frequency output set in each stage is transferred to other low temperature or unfrozen parts when the high frequency output is "O", and the thermal energy is diffused. The high frequency energy heating time and the high frequency output "O" time are repeated several times, and as thawing progresses due to internal heat transfer of the added thermal energy, the set high frequency output is gradually lowered, and this step is repeated to stabilize the product. Unzip the file.

As described above, according to this embodiment, compared to the conventional decompression method using only one type of high frequency output,
Thermal energy generated by dielectric heating of high-frequency energy is intermittent in high-frequency output, and when the high-frequency output is O, the heat is transferred to the interior and low-temperature parts, and the overall temperature is averaged. Radio wave distribution, which is a drawback of high-frequency heaters. In some cases, uneven thawing caused by uneven thawing can be prevented from being overheated and proceeding from thawing to cooking, allowing for more uniform thawing. As a result, in the past, the high-frequency output was lowered to around 200W, resulting in a longer thawing time, but in this example, the high-frequency output is reduced to around 400W due to the heat transfer effect of the accumulated high-frequency energy. The total thawing time can be shortened, and at the same time, the actual high-frequency energy is reduced, and by using repeated heating (heat transfer effect), the power consumption is virtually halved, resulting in energy savings. In addition, as it has become possible to thaw more uniformly, the type of food to be thawed,
For example, a simple linear formula that is not affected by minced meat, pork, chips, poultry, chunks of meat, or its weight (T=aw+b, T: time, W: weight of the item to be thawed, a, b: constants) This 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 applied to the food and accumulated up to that point is transferred to the inside of the food and to a low temperature, and the temperature of the food is averaged. By partially decompressing, when the next high-frequency energy is applied, it can be absorbed over a wide range, thereby reducing absorption unevenness due to differences in dielectric constant. Also, by repeating the time when high-frequency energy is applied and the time when "O" is applied with large intervals, it becomes easier to thaw the inside of the food.
Defrosting only the surface can prevent food from boiling. 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 thawing progresses, stable thawing can be obtained and the time spent on thawing can be increased. It 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 "O" as described above, the amount of power consumption is halved, contributing to energy saving.

(3) In the above defrosting sequence, the high frequency output and each time can be uniformly set according to the weight of the food, regardless of the type of food.
You can defrost food automatically by setting the weight of the food. This saves the user the trouble of creating a cooking manual or a program corresponding to the type and amount of food, and improves operability.

(4) The above decompression sequence is a simple linear equation T=
In addition to being able to express it as aw + b, by matching the setting time of different stages of each high frequency output, it is possible to reduce the ROM capacity of the microcontroller, simplify the program, improve other specifications, and The degree of freedom in microcomputer program design can be increased, such as by being able to switch to a small-capacity, inexpensive microcomputer.

[Brief explanation of the drawing]

Fig. 1 is an external view of one embodiment of the present invention;
The figure is a circuit diagram of an embodiment of the present invention, FIG. 3 is an operation explanatory diagram, 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.

Claims (1)

[Scope of Claims] 1. A control circuit device including a heating chamber that houses food, a high-frequency oscillator that supplies high-frequency output to the heating chamber, and a microcomputer that has a program function and controls the high-frequency output of the high-frequency oscillator. ,
a switch that controls the output of the high-frequency oscillator, and the microcomputer has a total defrosting time calculated in proportion to the weight of the food at least 2 times.
It is divided into three or more stages, and the decompression time of each divided stage is divided equally into a plurality of times when a predetermined high frequency output is present and when it is not, and this is repeated alternately. A high-frequency heating device comprising a program that outputs a high-frequency output preset for each stage by turning on and off the switch. 2 Divide the food into two or more equal parts in proportion to the weight,
Claim 1 comprising a thawing sequence expressed as T=aW+b, where T is the divided thawing time, a and b are constants common to each stage, and W is the weight of the food. The high frequency heating device described.