KR100238823B1 - Heating method for refrigeration food in microwave oven - Google Patents

Abstract

The present invention relates to a heating method for uniformly heating the frozen food in a microwave oven.

In the heating method according to the present invention, the first process of heating the frozen food to a normal output, the second process of determining whether the heated frozen food starts to melt, and if the frozen food does not melt, the first process continues to start melting The third process of intermittent heating, the fourth process of judging whether the frozen food has melted uniformly, and the third process if the frozen food does not melt uniformly, and if it melts uniformly, returns to normal output until the final target temperature. It consists of a 5th process of heating. The second process determines that the frozen food starts to melt when the surface temperature of the frozen food reaches a predetermined temperature, and the fourth process determines that the frozen food melts uniformly when the surface temperature of the frozen food reaches a predetermined temperature. do. In another embodiment of the determination of the melting state, it is determined that the frozen food starts to melt when the elevated temperature of the frozen food is slower or stops in the second process, and evenly melted when the temperature of the frozen food rises again in the fourth process. Will be judged.

Description

How to heat frozen food in microwave

1 shows an increase in the temperature of the object during heating of the microwave oven,

(a) is a graph showing the elevated temperature of a general food,

(b) is a graph showing the elevated temperature of the frozen food.

2 is a graph showing the heating state of the microwave oven according to the present invention.

3 is a flowchart showing a heating method according to the present invention.

The present invention relates to a heating method of a microwave oven, and more particularly, to a heating method of a frozen food configured to control the output intermittently while the frozen food is melted in order to uniformly heat the frozen food as a whole.

In a microwave oven, microwaves are cooked by heating an object. The microwave has a characteristic that the degree of absorption varies depending on the state of the object. For example, when microwaves are irradiated with ice, a large amount is transmitted, whereas when microwaves are irradiated with water, a large amount is absorbed.

Due to these characteristics, the rising temperature of the frozen foods and the frozen foods are different. This difference in temperature change is shown in FIG.

Figure 1 (a) is a graph showing the temperature rise of the general food, not frozen state, and (b) shows the temperature rise of the frozen food.

As shown, since the absorption rate of the microwave output is the same in the case of the general food, the temperature is increased while having the same rate of increase. However, in the case of frozen foods, there is a section (A) in which a certain temperature rise is slow or stopped.

The section (A) is a section in which frozen heat is heated by microwave for a predetermined time and partially defrosted, so that heat required for phase change is used as latent heat, and a section in which a substantial temperature rise does not appear. Means.

In other words, when heated in the frozen state, the temperature rises up to a certain portion, and in this state, latent heat for changing the ice into water is required. That is, there is no rise in temperature outside, and a certain amount of heat is required for the phase change inside. In this state, when the frozen food is continuously heated at a uniform output as in the prior art, a problem arises in which the object is unevenly heated.

In the section (A), the object is partly thawed, part is not thawed, and when the heating is continuously performed at the same output in this partially uneven state, the thawed part is heated and thawed in the unthawed state. You get the latent heat you need. However, as described above, the microwave has a large amount of permeation in the ice state and a large amount of absorption in the water state. Therefore, if the object is continuously heated in a non-uniform state as described above, the heated portion is heated more severely, The burned and unmelted parts, on the other hand, are cooked less cooked because the microwaves do not absorb much.

As described above, when the frozen food is continuously heated at the same output as the general food, a problem due to uneven heating of the object is pointed out. In addition, it is pointed out that the continuous heating in the section (A) requiring the latent heat of thawing frozen food as described above causes waste of power, such as partial overheating of the object.

That is, according to the conventional heating method of the microwave oven, in the case of frozen food, there is a disadvantage in that partial uneven cooking is performed and power is wasted.

The present invention is to solve the above disadvantages, to provide a heating method of the microwave oven that can evenly heat the frozen food.

Another object of the present invention is to provide a microwave oven which can reduce power consumption when heating frozen food.

The heating method of the frozen food according to the present invention for achieving the above object, the first process of heating the frozen food to a normal output, the second process of determining whether the frozen food is started to melt, and the frozen food is melted If not, continue with the first step, if the melting begins to intermittently heat the third process, to determine whether the frozen food melts evenly, and if the frozen food does not melt evenly continue to the third process If it melts uniformly, it consists of a fifth process of heating to a final output to the final target temperature.

The second step of determining whether the frozen food starts to melt is determined that the frozen food starts to melt when the surface temperature of the frozen food reaches a preset temperature, and the fourth step is to determine the surface temperature of the frozen food at a preset temperature. When it reaches, it is judged that it melts uniformly.

According to another embodiment, the second process determines that the frozen food starts to melt when the rising temperature of the frozen food is slower or stops than before, and the fourth process determines that the frozen food melts uniformly when the temperature of the frozen food rises again. Done.

According to the heating method according to the present invention, it is possible to eliminate the partial temperature deviation generated during the heating of the frozen food, and then the present invention will be described in more detail based on the embodiment of the present invention shown. Let's do it.

The heating method of the frozen food according to the present invention comprises the steps of heating the frozen food just before melting, the step of periodically regulating the output while the frozen food melts, and the step of heating the frozen food completely melted again Make a point.

The heating method according to the present invention will be described in detail with reference to FIG.

When the frozen food to be heated is selected to operate the heating method according to the present invention, first, a final target temperature of the frozen food is set (step 102). The final target may be directly selected by the user or may be set by the user by the information input inside the microwave oven by the input of the cooking type during the automatic cooking function. By operating the magnetron inside the microwave oven, the microwave is oscillated to continuously heat the object, which is a frozen food, to a normal output state (step 104).

At this time, the change in the surface temperature of the object that is continuously heated, that is, the temperature rise is detected through an infrared sensor (not shown) mounted in the microwave oven.

Next, in step 108, it is determined whether the frozen food starts to melt, and if it is not yet melted, the object is continuously heated while maintaining step 104, and if it is determined that the frozen food starts to melt, the process proceeds to step 110.

Next will be described a specific embodiment for determining when the frozen food starts to melt.

First, the first embodiment relates to determining this by using a temperature change by continuously sensing the temperature of frozen food using an infrared sensor mounted inside the microwave oven.

That is, it is known that the temperature of the frozen food being heated in step 104 is constantly rising, and this normal temperature increase continues until just before the frozen food starts to melt. When the frozen food starts to melt, the energy is consumed by the latent heat required during the melting of the frozen food, and thus the temperature rises until it is completely melted or appears very slowly. Therefore, by using this phenomenon, while the internal infrared sensor detects the temperature change of the frozen sore, it is determined that the frozen food starts to melt when the normal temperature rise is stopped or the temperature rise becomes slower than before.

Specifically, the infrared sensor senses the temperature of the frozen food at regular intervals, and the detected temperature is sent to an internal microprocessor. The microprocessor calculates the difference between the current temperature and the temperature of the previous cycle, and determines when the frozen food begins to melt when the temperature difference between these cycles is significantly removed.

Next, a second embodiment for determining the timing at which the frozen food starts to melt will be described. In this embodiment, the state of the frozen food is determined based on the surface temperature of the frozen food. For example, when the surface temperature of frozen foods is, for example, about -2 ° C, it is determined that frozen foods begin to melt. This temperature setting is considered in consideration of the melting point of the frozen food that usually contains a lot of moisture, and will be convenient to use by pre-input to the microprocessor inside the microwave oven. Of course, the temperature is not a predetermined value, of course, it can be changed by the user or the designer of the product to the appropriate temperature. Therefore, according to this embodiment, when the surface temperature of the frozen food reaches a predetermined temperature, the internal microprocessor determines that the frozen food starts to melt.

In step 108, the output of the magnetron of the microwave oven, which is determined to be the time at which the frozen food starts to melt, is changed. That is, from this point on, the latent heat is required for the entire frozen food to be evenly melted, and part of the latent heat is a process for sufficiently conducting the heat of the frozen food itself.

Therefore, in this section, the microwave output from the minnetron is intermittently output. In other words, the microwave is output for a certain time (for example, 20 seconds), and then the intermittent heating is performed to stop the microwave output for a certain time (for example, 10 seconds) (step 110).

By such intermittent heating, in the frozen food, the thawing of the frozen food is continued by the output of periodic microwaves, such that the heat of the melted portion is heat-conducted internally to a portion which is not yet melted. By maintaining such an intermittent output state, the partial temperature deviation of the frozen food is eliminated, and it is possible to have a uniform temperature as a whole. During this time of intermittent output, the infrared sensor continuously detects the temperature of the surface of the frozen food.

As the intermittent output proceeds, the infrared sensor determines whether the frozen food is melted uniformly (step 112). If it is determined that it is not uniformly melted, the state of the intermittent output is maintained, and if it is determined that it is melted, normal continuous heating is performed (step 114).

Here, determining whether the frozen food is melted uniformly is the same as the above-described embodiment. That is, the first embodiment determines whether the frozen food melts uniformly by sensing the temperature change of the frozen food, and the second embodiment determines whether the surface temperature of the frozen food has increased by a predetermined value. You will be judged.

In the first embodiment, the sensor for detecting the temperature change of the frozen food continuously detects the temperature at regular intervals. That is, it is determined whether the current temperature is rising normally compared to the previous temperature, and the temperature is rising normally. At this point, it is determined that the frozen food is uniformly melted. This judgment is based on the fact that, when the frozen food is completely melted, no latent heat is needed, and the temperature rises normally as much as the amount of microwaves supplied therein.

According to the second embodiment, the surface temperature of the frozen food is set in advance, and when the temperature sensed by the constant sensor reaches a preset temperature (for example, + 5 ° C.), the frozen food is uniformly at this point. It is determined that it is molten. This preset temperature is built into the microwave's microprocessor.

In this manner, if the frozen food is melted uniformly, the process proceeds to step 114, and the frozen food is heated to the final target temperature. Then, it is detected whether the food to be heated has reached the final target temperature (step 116), and if it does not reach, the continuous heating is continued, and when the final target temperature is reached, the heating by the microwave is stopped. The cooking according to the present invention is completed (step 118).

In the above description of the present embodiment, the frozen food was intermittently heated by changing the output cycle if necessary while sensing the temperature change of the frozen food. However, it may be possible to simply heat the output to a predetermined target temperature by continuing the continuous output, the intermittent output, and the continuous output.

In this case, however, the amount of frozen food to be heated is input to the inside of the microwave oven before heating, and the inside of the microprocessor proceeds by considering the thawing and latent heat according to the amount.

Specifically, for example, the volume of the frozen food to be cooked is divided into several, such as large, medium, small, or in several steps according to the exact volume. Then, the frozen food to be cooked is put into the cavity, and a process corresponding to the volume (for example, pressing a button corresponding to the volume or using a control lever so that the microprocessor can recognize the volume) It can be achieved by performing the following. Of course, at this time, it is necessary to calculate the calories to be supplied in consideration of the volume of the frozen food, and output the microwaves corresponding to these calories.

According to the present invention as described above, even when the frozen food is cooked, the whole food is heated uniformly. Therefore, the problem caused by partial heating and temperature deviation of the frozen food is resolved as in the related art.

And in the process of melting frozen foods, the process until complete melting, partly dependent on the internal heat conduction of the food itself to eliminate the waste of unnecessary power, problems caused by partial overheating of the food due to unnecessary power supply Is solving.

Claims (4)

A first process of heating the frozen food to a normal output, a second process of heating intermittently while the frozen food to be heated melts, and a third process of heating the frozen food that has been melted uniformly to the target temperature at a normal output again. Frozen food heating method in microwave oven. A first step of heating the frozen food to a normal output power; A second step of judging whether the frozen frozen food starts to melt; A third step of continuing the first step if the frozen food is not melting and intermittently heating when it starts to melt; A fourth step of determining whether the frozen food is melted uniformly; If the frozen food is not melted uniformly continue to the third process, if the melted uniformly comprises a fifth step of heating to a normal output to the final target temperature. The method of claim 2, wherein the second process determines that the frozen food starts to melt when the surface temperature of the frozen food reaches a predetermined temperature, and the fourth process is uniform when the surface temperature of the frozen food reaches a predetermined temperature. Frozen food heating method of the microwave oven judged that it melted. The method of claim 2, wherein the second process determines that the frozen food starts to melt when the rising temperature of the frozen food is slower or stops than before, and the fourth process determines that the frozen food melts uniformly when the temperature of the frozen food rises again. Frozen food heating method in microwave oven.

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