JPH07112457B2 - Microwave oven rice cooking control method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a microwave oven cooking control method, and more particularly to a rice cooking control method.

[0002]

2. Description of the Related Art A conventional method for controlling rice cooking in a microwave oven will be described with reference to FIG. As shown in FIG. 1, the entire rice cooking time is divided into a first heating time section (T ₁ ) and a second heating time section (T ₂ ).

First, in the first time, the maximum high frequency signal (P ₁ ) is generated so that the heating temperature in the heating chamber rapidly rises to about 100 ° C., and in the second time the maximum high frequency signal (P ₁ ) is reduced by about 40%. A high frequency signal corresponding to 60% is generated to cook rice.

However, the prior art has the following disadvantages.

In the first heating time section (T ₁ ), moisture absorption into rice and heating of rice are simultaneously performed. Therefore, the temperature rises sharply and the rice is heated without being fully absorbed by water.
After all, rice can be boiled as a whole.

Then, in the second heating time (T ₂ ), the residual water which is not absorbed by the rice in the first heating time section (T ₁ ) is boiled over. As a result, the water content became insufficient, and the rice was cooked raw, and the desired cooking was not realized.

[0007] A method for controlling rice cooking in a microwave oven to solve such inconvenience (Korean patent application No. 17629/1990, applicant Gold Star Co., Lt.
d.) was proposed.

According to this method, the user puts a container in which a predetermined amount of rice and water (for example, an amount corresponding to one serving or five servings) are mixed into the heating chamber of the microwave oven. After that, when the operation start key is pressed after pressing a key corresponding to a predetermined amount through the key signal input unit (1), the microcomputer performs the following operation according to a predetermined program stored in the internal memory. .

First, each rice cooking stage (ST _{1 to} ST ₅ )
When the microwave oven door is closed by the user after calculating the heating time (T _{1 to} T ₅ ) of the microwave oven, the microwave oven is operated by operating a plurality of relays linked to door switches provided on the door. Drive the lamp and fan. And each rice cooking stage (ST ₁ ~
The operation of the microwave oven is controlled by sequentially performing ST ₅ ).

[0010] That is, during the rice cooking stage corresponding to the moisture absorption process (ST ₁ ~ST ₂₎ heating time (T ₁ ~T _2), as the water is absorbed into the rice at a temperature of about 60 ° C. A high frequency signal for heating rice and water is output.

Then, during the heating time (T ₃ ) of the rice cooking stage (ST ₃ ) corresponding to the heating process, about 100 rice and water are mixed.
A high frequency signal for heating is output at a temperature of ℃ to 120 ℃.

After that, during the heating time (T _{4 to} T ₅ ) of the rice cooking stage (ST _{4 to} ST ₅ ) corresponding to the process of steaming rice, the rice and water are heated at substantially the same temperature as the heating process. The high frequency signal of is output.

When the process of steaming rice is completed, rice cooking is completed.

[0014]

However, such a conventional technique has the following disadvantages.

This method produces the optimum rice only when the ratio of rice to water for a predetermined amount selected by the user (for example, for one person, for two persons, for three persons, etc.) is accurate. Cooking was guaranteed. Therefore, in the case where the predetermined amount was not set (for example, for 1.2 persons or for 2.5 persons), satisfactory rice could not be cooked.

According to this method, satisfactory rice could not be cooked even when the ratio of rice to water for a predetermined amount was slightly different from the set ratio.

This method is inconvenient because the user has to troublesomely input the key signal corresponding to the predetermined amount according to the desired predetermined amount.

An object of the present invention is to eliminate the above disadvantages of the conventional technique. Even if a specific key signal is not input according to a predetermined ratio of rice and water, a water absorption process according to a predetermined amount is performed. Another object of the present invention is to provide a method for controlling rice cooking in a microwave oven, which can automatically control rice heating time, rice steaming time and high-frequency signal output to perform optimum rice cooking.

Another object of the present invention is to cook rice in a microwave oven capable of optimal rice cooking even if the ratio of rice to water for a predetermined amount does not slightly match. It is to provide a control method.

[0020]

In order to achieve the above-mentioned object, according to the present invention, first, by the control of a microcomputer, the first sensor for sensing the weight of food is used to separate rice and water. The mixed weight is sensed and the heating time intervals (T ₁ , T ₂ ) of the first stage and the second stage corresponding to the moisture absorption process are calculated according to the mixed weight. Then, after the gas (or vapor) remaining in the heating chamber is released for a predetermined time, a second sensor (for example, a humidity sensor) that senses the amount of humidity corresponding to the amount of change in the heating state in the heating chamber is initialized. .

Then, the first heating time period calculated for the first stage corresponding to the water absorption process is counted down, and the first high frequency heating signal has the maximum value until the heating time is finished. Is output.

When the first heating time period of the first stage is finished, the calculated second heating time period of the second stage is counted down to the second value corresponding to about 30% of the maximum value.
A high frequency heating signal is output. When the implementation of the second stage is completed, the third heating time period of the third stage corresponding to the heating process is counted up, and at the same time, the third high frequency heating signal is output as the maximum value. The third stage is performed until the amount of humidity sensed by the second sensor rises from the initial state value to the preset first humidity limit value. If the rise of the first humidity limit value is slow, the third heating time section of the third stage becomes as long as that value. Third
When all the stages have been executed, the fourth stage will start.

In the fourth stage, the fourth high frequency heating signal corresponding to about 50% of the maximum value is output during the fourth heating time period. The fourth stage is performed until the humidity amount sensed by the second sensor rises from the initial state value to a preset second humidity limit value or more. When the fourth stage is completed, the fifth stage corresponding to the process of steaming rice is performed. The fifth of this fifth stage
The heating time period is obtained by multiplying a value obtained by adding the first to fourth heating time periods by a preset constant value.

In the fifth stage, the calculated fifth
During the heating time period, the fifth high frequency heating signal corresponding to about 30% of the maximum value is output. Here, when the fourth stage is completed and only the fifth stage and the sixth stage in the process of steaming rice are present, the calculated fifth stage
The value obtained by adding the fifth heating time period of the stage and the preset sixth heating time period of the sixth stage is displayed through the time display unit, so that the user can cook rice in the process of steaming rice. I can recognize that there is.

Further, since the displayed remaining time is counted down, the user can know that cooking is completed.

When the fifth stage is completed, the next stage is the sixth stage, during which the preset sixth heating time period is
The sixth high frequency heating signal is output at the maximum value.

Therefore, it is possible to efficiently cook rice without the user having to enter a key signal for a predetermined ratio of rice and water.

[0028]

FIG. 2 is a block diagram showing a control unit of a microwave oven applied to the present invention. In FIG. 2, reference numeral 1 is a microcomputer that stores a predetermined program for automatically controlling the cooking of rice in the internal memory, and controls the operation of the microwave oven by this program. Reference numeral 2 is a time display unit for displaying the remaining heating time of rice cooking according to the control signal of the microcomputer (1), and reference numeral 3 is a predetermined key signal for operating the microwave oven according to the user's selection. ), A key signal input section, 4 is a load driving section for driving a load such as a fan and a lamp, 5 is a clock signal generating section for supplying a clock signal to the microcomputer (1), and 6 is each sensor. A sensing signal input / output unit that amplifies a signal sensed from the device to a predetermined amplification degree and outputs the amplified signal to a corresponding port of the microcomputer (1), and 7a senses the weight of food and drink placed in the heating chamber. The weight sensor 7b is a humidity sensor for detecting the humidity in the heating chamber based on the amount of change in the humidity state in the heating chamber.

FIGS. 3 and 4 are circuit diagrams showing the essential parts of two embodiments of the microwave oven applied to the present invention.

2 to 4, reference numeral 8 is a high-frequency signal generator for outputting a high-frequency signal under the control of the microcomputer (1), MGT is a magnetron, F is a fan, LP is a lamp, and RY ₁ ... RY ₃ is a relay, HV
T is a transformer, So is a switch, and S _{1 to} S
₃ is a relay contact switch, AC is an AC power supply, R _{1 to} R ₄ are resistors, Q _{1 to} Q ₃ are transistors, D _{1 to} D ₄ are diodes, and C ₁ is a capacitor.

The control process of rice cooking according to the present invention will be described with reference to the structure of the microwave oven shown in FIGS. 2 to 4 and the flow charts shown in FIGS.

First, in FIG. 2 and FIG. 3, in order to cook rice in a microwave oven, a container containing rice and water is placed in the heating chamber, and the microwave oven door is closed. turns on the switch (So) the microcomputer (1) together is switched on the relay (RY ₁ to Ry ₃₎ which - causes driving (on-where drive).

As a result, the relay contact switches (S ₁ ~
S ₃ ) is turned on, the lamp (LP) of the microwave oven is turned on, the fan (F) is driven, and the high voltage transformer (HVT) 1
DC power is converted to AC and supplied to the next side.

At the same time, when the sensor cooking key signal is input through the key signal input section (3), the microcomputer (1) executes the programs shown in FIGS. 5 and 6. That is, as shown in FIG. 5, when the sensor cooking key signal is input and the start key signal is input, the microcomputer (1) drives the fan (F) so that the magnetron (MGT) does not oscillate in a predetermined state. Whether the weight sensor (7a) and the humidity sensor (7b) are electrically coupled to their corresponding ports via the sensing signal input / output unit (6) during a time (for example, about 4 seconds). Check.

If the weight sensor (7a) and the humidity sensor (7b) are not connected to their corresponding ports, an error corresponding to this state is displayed, the routine is terminated, and the corresponding ports are returned. If it is in a state of being combined with the food, the weight of food and drink (rice and water) placed on the rotary table in the heating chamber is detected through the weight sensor (7a), and the detected weight (Wo) is detected in advance. Set constant (k
₁ ) (k ₂ ) and the first heating time period (T ₁ ) and the second heating time period (T ₂ ) of the first stage (ST ₁ ) and the second stage (ST ₂ ) corresponding to the water absorption process. ) Is calculated by the following equation (1).

T ₁ = K ₁ W _o , T ₂ = K ₂ W _o ... (1)

At this time, the microcomputer (1)
After the fan (F) is driven for a predetermined time (for example, about 10 seconds) to release the residual gas and humidity in the heating chamber, the humidity sensor ( 7b), and the detected value is set to the initial state.

Along with this, the microcomputer (1)
Is a switching transistor (Q
₁ ) The first heating time of the first stage (ST ₁ ) and the second stage (ST ₂ ) corresponding to the calculated water absorption process by driving the relays (RY _{1 to} RY ₃ ) via (Q ₂ ). The output of the high frequency heating signal is controlled during the period (T ₁ ) and the second heating time period (T ₂ ).

That is, when the relays (RY _{1 to} RY ₃ ) of FIG. 3 are turned on, the relay contact switches (S _{1 to} S ₃ ) are turned on, and the high frequency signal generator (8) is supplied with the alternating current power (AC). As a result, the high frequency signal generator (8) oscillates and outputs a high frequency signal into the heating chamber, whereby rice and water begin to heat.

[0040] When performing the moisture absorption process, the microcomputer (1) the first stage flag logic value high state (ST ₁₎ flag set status check to the first stage of the (ST ₁₎ (hereinafter '1' 2), it is determined that the heating during the first heating time period (T ₁ ) of the first stage (ST ₁ ) is completed, and the second
Check the set state of the stage (ST ₂ ) flag.

The flag of the first stage (ST ₁ ) is "1".
Is set to the first stage (ST ₁ ) of the first stage
Heating period a (T ₁₎ reduced by 1 second counts down, the first heating period of the calculated first stage (ST ₁₎ (T ₁₎ to determine whether it has ended. When all the calculated first heating time period (T ₁ ) is counted (T ₁ =
0), the flag of the first stage (ST ₁ ) is released to the logic value low state (hereinafter referred to as “0”), and the flag of the second stage (ST ₂ ) is set to “1”.

The flag of the second stage (ST ₂ ) is
'1' and if set, the microcomputer (1) is a relay (RY ₁ to Ry ₃₎ of FIG. 3 are turned on / off by the oscillation frequency signal generator (8), the second stage (ST ₂ ), During the second heating time period (T ₂ ) of the maximum value of 3
The high frequency heating signal corresponding to 0% is output to the second stage (ST
₂₎ the second heating period (T ₂₎ is output until when all is counted down.

The cooking process of rice will be described below with reference to FIG.

In the first stage (ST ₁ ) of FIG. 7, the first stage
The high frequency heating signal (P ₁ ) is output as the maximum value to heat the rice and water during the first heating time period (T ₁ ), and when the first heating time period (T ₁ ) elapses, the second stage (ST _2). )
During the second heating time period (T ₂ )
The second high frequency heating signal (P ₂ ) corresponding to 0% is output. Therefore, the rice absorbs sufficient moisture.

On the other hand, when the second heating time period (T ₂ ) of the second stage (ST ₂ ) which is the process of absorbing water is completed, the microcomputer (1) is changed to the third stage (ST ₃ ).
Check if the flag is in the "1" state. At this time, the flag of the third stage (ST ₃₎ is '1' because it is state and set in the second stage (ST _2), the microcomputer (1) performs a third stage (ST _3), the 3 The heating time section (T ₃ ) is counted up in units of 1 second.

Further, the microcomputer (1) detects the amount of humidity (ΔG ₁ ) detected by the humidity sensor (7b).
(I.e., corresponding to the gas and steam in the heating chamber by heating) When rises to a preset first humidity limit value (G ₁₎ or more, the flag of the third stage (ST ₃₎ '1' from the state ' The humidity sensor (7
The flag of b) is also released from the “1” state to the “0” state, and then the flag of the fourth stage (ST ₄ ) is set to the “1” state.

As described above, the third heating time period (T ₃ ) of the third stage (ST ₃ ) has not been calculated previously, and may be longer or shorter depending on the state change in the heating chamber.

During the third heating time period (T ₃ ), the third high frequency heating signal (P ₃ ) changes the rice and water in the heating chamber to 100 ° C.
The maximum value is output in the same manner as the first high-frequency heating signal (P ₁ ) so that heating can be performed at a temperature of 120 ° C. to 120 ° C.

Here, the process of comparing the sensed humidity amount value (ΔG ₁ ) in the heating chamber with the preset first humidity limit value (G ₁ ) is as shown in FIG. Along with the process, a water absorption process can be performed.

This is to cope with the case where the weight sensor (7a) erroneously detects the weight of rice and water.

For example, when the weight of rice and water is detected to be larger than the actual weight, the first heating time period (T ₁ ) is calculated to be longer than the actual weight, so that excessive heating is required during the water absorption process. Done.

Therefore, if the humidity in the heating chamber increases above the first humidity limit value (G ₁ ) during the second stage (ST ₂ ) of the water absorption process (ΔG ₁ ≧ G ₁ ), Even if the second heating time period (T ₂ ) is not completely counted down, the second stage (ST ₂ ) is ended, the third stage (ST ₃ ) is omitted, and the fourth stage (ST ₄ ) is directly performed. Be seen.

However, the humidity amount value (ΔG ₁ ) in the heating chamber detected in the second stage (ST ₂ ) is the first humidity set until the end of the second heating time section (T ₂ ). If the limit value (G ₁ ) is not reached, as described above, the second heating time period (T ₂ ) is completely counted down until the second heating time period (T ₂ ) is counted down.
After the stage is performed, the third stage is performed.

As described above, when the third stage (ST ₃ ) is all performed during the third heating time period (T ₃ ), the flag of the fourth stage (ST ₄ ) corresponding to the heating process is also “1”. Set with state. In the state where the flag of the fourth stage (ST ₄ ) is set to the “1” state,
The stage (ST ₄ ) is performed, the fourth high frequency heating signal (P ₄ ) is output as a value corresponding to about 50% of the maximum value, and the rice in the heating chamber and the rice during the fourth heating time period (T ₄ ). Heat the water.

That is, during the third heating time period (T ₃ ) of the third stage (ST ₃ ), the third high-frequency heating signal (P ₃ ) is output as the maximum value to heat rice and water, and the fourth stage In (ST ₄ ), during the fourth heating time period (T ₄ ), the fourth high-frequency heating signal (P ₄ ) corresponding to 50% of the maximum value is output to heat rice and water.

Therefore, it is possible to prevent the boiling water from overflowing due to continuous high heating. The fourth heating time period (T ₄ ) is also not preset like the third heating time period (T ₃ ), and can be shortened due to the state change (that is, the humidity change) in the heating chamber. That is, in the fourth heating time period (T ₄ ), the humidity amount (ΔG ₂ ) in the heating chamber detected by the humidity sensor (7 b) immediately after the count-up.
Is the time until it reaches the preset second humidity limit value (G ₂ ).

Further, during the fourth heating time period (T ₄ ) of the fourth stage (ST ₄ ), the humidity amount (ΔG ₂ ) sensed by the humidity sensor (7 b) is preset to the second humidity limit. When it is higher than the value (G ₂ ) (ΔG ₂ ≧ G ₂ ), the humidity sensor (7b) and the flag of the fourth stage (ST ₄ ) are set to “1”.
The state is released to the '0' state.

Along with this, the fifth heating time period (T ₅ ) of the fifth stage (ST ₅ ) corresponding to the process of steaming rice.
Is calculated as in the following equation (2), and the flag of the fifth stage (ST ₅ ) is set to the '1' state.

T = K ₃ (T ₁ + T ₂ + T ₃ ) ... (2)

In the equation (2), K ₃ is a preset constant. Here, the fifth heating time period (T ₅ ) is the fourth
The heating time section (T ₄ ) may be included in the calculation, or the third heating time section (T ₃ ) may be excluded.

As described above, in the third stage (ST ₃ ) which is a heating process, a predetermined third heating time period (T ₃ )
During this period, the maximum value high frequency signal (P ₃ ) is output.

However, after the end of the third heating time period (T ₃ ), in the fourth stage (ST ₄ ), the _fourth value corresponding to 50% of the maximum value during the predetermined heating time (T ₄ ). It outputs a high frequency signal (P ₄ ).

The third stage (S
When T ₃ ) and the fourth stage (ST ₄ ) are completed, the first stage (S ₃ ) is added to the constant (K ₃ ) set as described above.
T ₁₎ first heating period of (T ₁₎ and the second stage (ST
₂ ) 2nd heating time section (T ₂ ) and 3rd stage (S
T ₃₎ of the third heating period (T ₃₎ and the fifth heating period of the fifth stage which is obtained by multiplying the summed value (ST ₅₎ (T _5), the process for cook by steam the rice The sixth heating time period (T ₆ ) (for example, 3 minutes) of the sixth stage (ST ₆ ) which is the last stage is added and displayed on the time display portion (2).

Thereafter, the microcomputer (1) is the fifth
The flag state of the stage (ST ₅ ) is checked, and the flag of the fifth stage (ST ₅ ) is already set to '1' at the end of the fourth stage (ST ₄ ). ₅ ) is performed.

Then, in the fifth stage (ST ₅ ), the fifth stage
The heating chamber is heated for the fifth heating time period (T ₅ ) with the high frequency signal (P ₅ ) corresponding to about 30% of the maximum value. When the fifth heating time period (T ₅ ) is all counted down, the flag of the fifth stage (ST ₅ ) is released from the '1' state to the '0' state.

If all of the fifth stage (ST ₅ ) is performed, then the sixth stage (ST ₆ ) is performed and heating is performed while the sixth heating time section (T ₆ ) corresponding to the remaining heating time is counted down. The sixth high-frequency signal (P
₆ ) Heated as. When the sixth stage (ST ₆ ) corresponding to the final process for steaming rice is completed, the relays (RY _{1 to} RY ₃ ) in FIG. 3 are turned off, and the whole process of rice cooking control is completed. .

Here, the water absorption process, the heating process, and the process for steaming rice are all in two stages, but they can be stages in more or less than that.

[0068]

As described above, according to the present invention,
It has the following effects.

The weight sensor detects the mixed weight of rice and water, and the weight determines the heating time in the water absorption process, which allows the rice to absorb water sufficiently.

Since the humidity amount corresponding to the change in the state of the heating chamber can be detected by using the humidity sensor and the heating time of the heating process can be determined twice or more, the water is boiled during the cooking of rice. It is possible to prevent overflow.

Since the cooking time of rice is adjusted according to the amount of humidity in the heating chamber, not only can the rice be cooked optimally even if the proportion of rice and water is improper, but the unnecessary heating time can be shortened. Waste can be prevented.

[Brief description of drawings]

FIG. 1 is a graph showing a relationship between a heating time, a heating temperature and an output of a high frequency signal according to a conventional method.

FIG. 2 is a block diagram showing an embodiment of a microwave oven control device applied to the present invention.

FIG. 3 is a circuit diagram showing a main part of a microwave oven according to an embodiment applied to the present invention.

FIG. 4 is a circuit diagram showing a main part of a microwave oven according to another embodiment of the present invention.

FIG. 5 is a part of a flowchart showing a rice cooking control process according to an embodiment of the present invention.

6 is a flowchart showing a rice cooking control process according to an embodiment of the present invention, which is a flowchart following FIG. 5;

FIG. 7 is a graph showing a relationship between a heating time and a heating stage and output of a high frequency signal according to an embodiment of the present invention.

[Explanation of symbols]

1 microcomputer 2 hours display unit 3 key signal input unit 4 humidity load driver 5 clock signal generator 6 sensing signal output part 7a weight sensor 7b sensitive sensor S _o switches S ₁ to S ₃ relay contact switch D ₁ to D ₄ diode Q ₁ to Q ₃ transistor RY ₁ to Ry ₃ relay R ₁ to R ₄ the resistance LP lamp F fan HVT high voltage transformer MGT magnetron

Claims (8)

[Claims] 1. A step of detecting a weight of a mixture of rice and water placed in a heating chamber of a microwave oven, a plurality of steps for absorbing moisture of rice from the detected weight of the mixture of rice and water. Calculating and setting a heating time section, outputting each high-frequency heating signal preset for each of the plurality of heating time sections for moisture absorption into the heating chamber in each heating time section And a step of performing a moisture absorption process for stimulating rice, and a step of performing a heating process of outputting preset high frequency heating signals to the heating chamber for each of a plurality of heating time intervals for heating. Until the humidity amount in the heating chamber corresponding to the cooking state in the heating chamber reaches each humidity limit value set for each heating time period, each high-frequency heating signal in each heating time period. Output And, the time to reach each of the humidity limit value is each heating time section, a step of performing a heating process, based on the heating time of the moisture absorption process and the heating process, for steaming rice Calculating a plurality of heating time intervals, in each of the plurality of heating time intervals for steaming, rice and water in the heating chamber are controlled by respective high frequency heating signals preset for each of the intervals. A method of controlling rice cooking in a microwave oven, the method comprising the steps of heating and steaming rice. 2. The method for controlling rice cooking in a microwave oven according to claim 1, wherein the last section of the plurality of heating time sections in the steaming process of the rice is preset. . 3. Each of the heating time intervals of the moisture absorption process comprises the detected weight of the mixture of rice and water,
The method for controlling rice cooking in a microwave oven according to claim 1, wherein the method is obtained by multiplying each of a plurality of preset constants. 4. Each of the heating time intervals in the steaming process of the rice is added by adding all of the heating time intervals of the heating process and the water absorption process, or a part of the interval. The method for controlling rice cooking in a microwave oven according to claim 1, wherein the value is obtained by multiplying a value by a preset constant. 5. A high-frequency heating signal having a maximum value is output in the first heating time section of each of the moisture absorption process and the heating process and the last heating time section of the steaming process of rice, and other than that, The method for controlling rice cooking in a microwave oven according to claim 1, wherein a high frequency heating signal equal to or less than the maximum value is output in the heating time section. 6. The step of absorbing moisture, wherein the moisture absorbing process is interrupted when the humidity amount in the heating chamber reaches a preset humidity limit value, and subsequently, the process from the latter half of the heating process is performed. The method for controlling cooking of rice in a microwave oven according to claim 1, further comprising: 7. The moisture absorption process includes a first heating time period and a maximum value during the first heating time period.
A first stage for providing a high frequency heating signal, and a second stage including a second heating time period and providing a second high frequency heating signal corresponding to about 30% of the maximum value during the second heating time period. In the heating process, the third high-frequency heating signal is applied and the third high-frequency heating signal is heated by the first high-frequency heating signal until the amount of humidity in the heating chamber rises to a preset first humidity limit value or more. A third stage, which is a section of heating time, and a third high frequency heating signal corresponding to about 50% of the maximum value, and a humidity amount in the heating chamber which is heated by the third high frequency heating signal are preset. A fourth stage in which a section of the fourth heating time is a time until the second humidity limit value is exceeded, and the process of steaming the rice includes a section of the first heating time,
A fifth value obtained by multiplying a value obtained by adding the second heating time period and the third heating time period by a preset constant.
A fifth stage including a heating time period and giving a fourth high frequency heating signal corresponding to about 30% of the maximum value to the fifth heating time period; and a preset sixth heating time period, and A sixth cooking stage for applying the first high-frequency heating signal to the sixth heating time period, the rice cooking control method of the microwave oven according to claim 1. 8. The second stage interrupts the second stage when the amount of humidity in the heating chamber rises above the preset first humidity limit value, without performing the third stage, The method for controlling rice cooking in a microwave oven according to claim 7, further comprising the step of immediately performing the fourth stage.