JP2539972B2 - Microwave cooking rice 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 method for controlling cooking rice in a microwave oven, and in particular, it is possible to cook high quality rice by performing three steps of a water absorbing step, a heating step and a steaming step. The present invention relates to a rice cooking control method for a microwave oven.

[0002]

2. Description of the Related Art Generally, according to a conventional rice cooking control method for a microwave oven, as shown in FIG. 1, the time for cooking rice is divided into two sections (t ₁ , t ₂ ). In one section (t ₁ ), the temperature inside the heating chamber rises rapidly (1
The high frequency output (P _a ) as
In the second section (t ₂ ), the high frequency output (p _b ) was heated to a state where it was reduced to about 40% to cook rice.

However, since the conventional rice-cooking control method simultaneously absorbs and heats moisture in the first section (t ₁ ), the moisture is not sufficiently absorbed by the rice due to the rapid temperature rise. So, it has been pointed out that rice is cooked raw,
In addition, in the second section (t ₂ ), the remaining water that has not been sufficiently absorbed in the first section (t ₁ ) begins to boil over, and the water content becomes insufficient. There was a problem.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention comprises a rice cooking process that is performed by three steps of a water absorption process, a heating process and a steaming process. Its main purpose is to provide a rice cooking control method that enables high quality rice cooking.

[0005]

SUMMARY OF THE INVENTION To achieve such an object, the present invention requires a high temperature so that water reaches a temperature below a predetermined boiling point for a certain period of time (T ₁ ). Moisture absorption step of heating to output and heating to low output for a certain time (T ₂ ) so as to keep the temperature of preheated water constant so that the rice absorbs sufficient amount of water ( T _A )
When a heating stage the water to heat during a certain time the water above the boiling point temperature to cook the rice, which is water _{(T 3) (T B)} , constant decreases the frequency output from the stage steaming during time (T ₄₎ of the characterized in that it is made from a stage (T _C) of heating as during high power periods of time the residual water to evaporate (T _5).

[0006]

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

As shown in FIG. 2, the embodiment of the present invention divides the water absorption process (T _A ) into two sections (t ₁ , t ₂ ), and increases in the first section (T ₁ ). The high frequency output (P ₁ ) is heated so as to reach a temperature below the boiling point of water at a high speed, and the high frequency output (P ₂ ) is reduced in the second section (T ₂ ) in the first section (T ₂ ). ₁₎ the temperature reached was controlled to maintain at, and heated so that the temperature above the boiling point of water at the water absorption process of the water (T _a) is increased by f the high-frequency output (P _3), Third section (T
It is controlled so that the rice cooking is promoted from the heating process (T _B ) of heating during ₃ ).

Then, following the heating process (T _B ), the fourth and fifth sections (T ₄ , T ₅ ) are further divided into a fourth section.
Reduced high frequency output (P ₄ ) in section (T ₄ ).
Then, in the fifth section (T ₅ ), the steaming process (T _C ) is performed by controlling the heating with the increased high frequency power (P ₅ ) to evaporate the remaining water.

In the embodiment of the present invention, as shown in FIG. 3, a microcomputer (1) for storing a predetermined program for executing the above rice cooking method and controlling the entire microwave oven.
And a time display section (2) under the control of the microcomputer (1)
And a load driving circuit unit (4) for driving a load by the microcomputer (1) and a key input unit (3) for inputting a key operation signal to the microcomputer (1). The control device is provided with a control signal (CL) that is input to the microcomputer (1) according to whether or not it can be driven.

The control circuit of the microwave oven under the control of the above-mentioned control device has a door switch (So ₁ , So ₂ , So ₃₎ which is turned on and off by opening and closing the door of the microwave oven as shown in FIG. ), And the relays (RY _{1 to} RY ₃ ) are turned on / off by the transistors (TR ₁ , TR ₂ , TR ₃ ) of the load drive circuit unit (4), the oven lamp (5), the fan (6), and It is composed of the contact switches (Y ₁ , Y ₂ , Y ₃ ) of the relays (RY ₁ , RY ₂ , RY ₃ ) for shutting off the power supply (AC) of the high frequency oscillating means (7).

In the drawings, unexplained symbols R _{1 to} R ₃ are resistors,
D _{1 to} D ₃ are reverse direction preventing diodes, and F is a fuse.

[0012]

According to the embodiment of the present invention constructed as described above, first, in order to cook rice by a microwave oven, rice and water are put in a container, put in a heating chamber, and the door is closed. Door switch (S
o) and (So _{1 to} So ₃ ) are turned on. When this door switch (So) is turned on, the microcomputer (1)
Since a power source (Vcc) is applied to the output terminals and a high signal is output at the output terminals (m ₁ , m ₂ ) of the microcomputer (1), the relays (RY ₁ , RY ₂ ) are excited. Therefore, the contact switches (Y ₁ , Y ₂ ) of the relays (RY ₁ , RY ₂ ) are turned on, so that the oven lamp (5) is turned on and the fan (6) is driven.

In the state where the rice cooking key and the quantity key of the key input unit (3) connected to the microcomputer (1) are operated and input by the following process, the output terminal (m ₃ ) of the microcomputer (1) By outputting a high signal at
Y ₃ ) is excited and the relay contact switch (Y ₃ ) is turned on to control the high frequency output of the high frequency oscillating means (7) to perform rice cooking. This process will be described in more detail with reference to FIGS. 5 and 6. The explanation is as follows.

That is, it is determined whether or not the rice cooking key has been operated, and when the rice cooking signal is input, it is subsequently determined whether or not the quantity (water + weight of rice) has been set (step 101,
102), after setting the amount, for each section for performing the water absorption process (T _A ), the heating process (T _B ), and the steaming process (T _C ) as shown in FIG. 2 based on the input amount. Cooking time (T ₁ , T ₂ , T ₃ , T ₄ , T
_After calculating ₅ ) (step 105), the overall rice cooking time is displayed and it is determined whether or not a rice cooking start signal has been input (step 105).

If the rice cooking start signal is not input in the next process, the process is repeated from the above determination process of the quantity set,
If the rice cooking start signal is input, the microcomputer (1)
Relay (RY ₁ to Ry ₃₎ is turned ON by (step 106).

The microcomputer (1) uses the relay (RY
₃ ) is excited, so the relay switch (Y ₃ ) is turned on.
Then, since the power supply (AC) is supplied to the high frequency oscillating means (7), the high frequency oscillating means (7) oscillates and a high frequency signal is output to the heating chamber to start heating rice and water.

In the next process, the water absorption process (T _A ) is divided into two sections (T ₁ , T ₂ ), and is heated by the maximum high frequency output (P ₁ ) in the first section (T ₁ ). When the temperature in the heating chamber reaches 60 ° C., the second chamber (T ₂ ) is performed to heat the heating chamber by the reduced high frequency output (P ₂ ), while maintaining the temperature of 60 ° C. Make sure it absorbs enough water.

In the water absorption process (T _A ), the first section (T ₁ ) is counted while counting down the first section (T ₁ ).
If it is finished by judging whether or not the
To turn off the relay (RY ₃ ) (step 10
7, 108, 109) and the second section (T ₂ ) while counting down, the relay (R) in the second section (T ₂ ).
Counting down the ON time (T _n ) and the OFF time (T _f ) of Y ₃ ) and repeatedly performing the process of determining whether or not the end has occurred to maintain the reduced high frequency output (P ₂ ),
When it is determined whether or not the second section (T ₂ ) has ended,
After turning off the relay (RY ₃ ) (step 201
～209), ends the water of the water course (T _A) by moving to the process of counting down the third section of the heating, which is the next process (T _3).

Then, a heating process (T _B ) is performed. That heating process (T _B) while counting down the third section (T ₃₎ of the heating, the relay (RY ₃₎ from the third section (T ₃₎ within the heating time (T _n) and OFF time ( T _f ) is counted down (steps 301 and 302), and the process of determining whether or not it has ended is repeatedly performed (steps 302 to 3).
08) The increased high frequency power (P ₃ ) is used to maintain the temperature in the heating chamber at 100 to 120 ° C., and the temperature in the heating chamber is 100 to 120 ° C. during the heating process (T _B ).
Since it is kept at ℃, rice is boiled and water absorption process (T
No overflow boiled by residual moisture in the heating process by the water absorption of the water (T _B) by _A). And the third of heating
When the section (T ₃ ) is finished, the process proceeds to the fourth section (T ₄ ) of the steaming step (T _C ) which is the next step.

In the next process, the steaming process (T _C ) is divided into the fourth and fifth sections (T ₄ , T ₅ ), and the fourth section (T ₄ ).
In the section ( ₅ ), the steam is heated to a reduced high-frequency output (P ₄ ) and steamed, and in the fifth section (T ₅ ), the remaining water heated as an increased high-frequency output (P ₅ ) is quickly evaporated to finish cooking rice. To do.

That is, the steaming process (T _C ) counts down the fourth section (T ₄ ) after the heating process (T _B ) is completed (step 401), and the fourth section (T ₄ ).
ON time (T _n ) and OFF of relay (RY ₃ ) from inside
The process of counting down the time (T _f ) and determining whether or not it has ended is repeatedly performed (steps 402 to 409) to heat the heating chamber with the reduced high frequency output (P ₄ ), and
When the section (T ₄ ) is completed, the fifth section (T ₅ ) is counted down (step 501), and the fifth section (T ₅ ) is counted.
₅ ) ON time (T _n ) and O of relay (RY ₃ ) from inside
The process of counting down the FF time (T _f ) and determining whether or not it has ended is repeatedly performed (steps 502 to 509) and heated by the increased high frequency output (P ₅ ), but in the fifth section (T ₅ ). When is finished, relay (RY _{1 to} RY ₃ )
Turn off all and complete all the steps of rice cooking control.

In the embodiment of the present invention, the relation between the high frequency outputs (P _{1 to} P ₅ ) output in the heating chamber during the rice cooking method is P ₁ ≧ P ₃ ≧ P ₅ > P ₄ ≧ P ₂ The time for each section is T ₄ > T ₂ ≧ T ₃ > T ₁ ≧ T ₅
The water absorption process (T _A ), the heating process (T _B ), and the steaming process (T _C ) are controlled so that T _C ≧ T _A ≧ T
It is most desirable to control so that it becomes _B.

[0023]

As described above, according to the present invention, rice can be made to absorb water sufficiently to cook high quality rice,
In addition, the phenomenon that the boiling water overflows is prevented, and even after the rice is cooked by the microwave oven, the heating chamber is always kept clean so it is hygienic and the effect that the microwave oven can be used conveniently is there.

[Brief description of drawings]

FIG. 1 is a graph showing a heating time, a heating temperature, and a high-frequency output relationship according to a conventional rice-cooking control method for a microwave oven.

FIG. 2 is a graph showing the relationship between heating time, heating temperature, and high-frequency output according to the method of the present invention.

FIG. 3 is a block diagram of a control device according to the present invention.

FIG. 4 is a control circuit diagram of a microwave oven according to the present invention.

FIG. 5 is a flow chart for explaining the operation of the method of the present invention.

FIG. 6 is a flowchart for explaining an operation according to the method of the present invention.

[Explanation of symbols]

 1 Microcomputer 2 Time display section 3 Key input section 4 Load drive circuit section 7 High frequency oscillation means

Claims (1)

(57) [Claims] 1. Heating at high power so that the water quickly reaches a temperature below a predetermined boiling point for a certain period of time T ₁ and a constant to keep the temperature of the heated water constant. The first step (T _A ) of heating at low power during the time T ₂ to allow the rice to fully absorb the moisture, and the water above the boiling point to boil the moisture-absorbed rice. a second step of heating for a fixed time T ₃ to a temperature (T _B), the second stage from the steaming between decreasing the output constant time T _4, a constant remaining moisture to evaporate Time T
₅ is heated at high output for a third phase _{(T C),} it consists of the length of the time _{T 1, T 2, T 3} , T 4, T 5, T 4
> T ₂ ≧ T ₃ > T ₁ ≧ T ₅ and the respective high frequency outputs P ₁ provided during the respective times T ₁ , T ₂ , T ₃ , T ₄ , T ₅ . P ₂ , P ₃ ,
The output values of P ₄ and P ₅ are set to P ₁ ≧ P ₃ ≧ P ₅ > P ₄ ≧ P ₂
A method for controlling rice cooking in a microwave oven.