KR0138606B1 - Cooking control device of microwave oven - Google Patents

Abstract

The present invention relates to a cooking control apparatus and a method of a microwave oven for performing an optimal cooking operation by adjusting the position of the stirrer according to the distribution of the high frequency flow into the cooking chamber to distribute the high frequency evenly in the cooking chamber. In addition, a stirrer for adjusting the dispersion direction of the high frequency generated in the magnetron, high frequency detection means for detecting the amount of high frequency changes depending on the type, weight and heating state of the food placed in the cooking chamber when the magnetron is driven; Control means for determining the position of the stirrer at the same time as determining the high frequency distribution diagram in the cooking chamber according to the amount of high frequency detected by the high frequency detection means, and for determining the position of the stirrer in accordance with the position determined by the control means. Characterized in that it consists of a stirrer driving means for driving the stirrer driving motor to adjust, Irrespective of changes in dielectric constant due to plant type, weight, and heating conditions, the high frequency is evenly distributed in the cooking chamber to uniformly heat food and increase the efficiency of using high frequency energy to the maximum. have.

Description

Microwave cooking control device and method

1 is a schematic front view of a microwave oven according to an embodiment of the present invention.

2 is a schematic plan view of a microwave oven according to an embodiment of the present invention.

3 is a control block diagram of a cooking control apparatus for a microwave oven according to an embodiment of the present invention.

4 is a flowchart showing a cooking control operation sequence of the microwave oven according to the present invention.

5 is a position step diagram showing the rotational position of the stirrer applied to the present invention in eight steps.

* Explanation of symbols for main parts of the drawings

10: DC power supply means 20: cooking input means

30: control means 40: high frequency detection means

41 to 44: high frequency sensor 50: stirrer driving means

51: stirrer drive motor 52: stirrer

60: magnetron driving means 70: display means

The present invention adjusts the position of the stirrer according to the distribution of microwaves (hereinafter, referred to as high frequency) introduced into the cooking chamber so that the high frequency is evenly distributed in the cooking chamber. An apparatus and a method thereof are provided.

In general, in the conventional high frequency heating apparatus, when the food is placed in the cooking chamber formed on the inner part of the main body and then the start button is pressed, the high frequency generated from the magnetron is guided through the waveguide and distributed into the cooking chamber.

At this time, the high frequency introduced into the cooking chamber is reflected by the metal wall, which is the structure of the cooking chamber, is applied to the food from various directions, and directly applied to the food, and starts to cook the food rotated in the cooking chamber.

On the other hand, in the cooking chamber, an incident high frequency and a reflected high frequency interfere with each other to generate a standing wave formed by repetition of a portion having a high intensity and a low portion of a high frequency.

The intensity of the high frequency in the cooking chamber is partially shifted due to the generation of the standing wave, so that the high frequency is not evenly distributed in the cooking chamber, thereby making it difficult to uniformly heat food.

In addition, since the generation environment of the standing wave changes from time to time depending on the type, weight and dielectric constant of the food placed in the cooking chamber, the high frequency spraying method using the fixed impedance uniformly responds to various food changes. There is a problem that can not meet the consumer's satisfaction with the product because the operation can not be performed.

Therefore, the present invention has been made to solve the above problems, an object of the present invention is to adjust the position of the stirrer in accordance with the change in the distribution of the high frequency inflow and dispersion in the cooking chamber by varying the impedance of the food type, weight And a microwave cooking control device capable of uniformly heating food by heating high frequency evenly in the cooking chamber irrespective of a change in dielectric constant due to a heating state and the like, and maximizing utilization efficiency of high frequency energy. To provide that method.

In order to achieve the above object, a cooking control apparatus for a microwave oven according to the present invention applies a cooking chamber formed in a predetermined space to place food, a high voltage transformer for converting AC power input into the device into a high voltage, and a high voltage of the high voltage transformer. A microwave oven comprising a magnetron for receiving high frequency and a waveguide for guiding a high frequency generated from the magnetron into a cooking chamber, the stirrer being mounted to a feed hole of the waveguide so as to adjust the dispersion direction of the high frequency generated from the magnetron. And a high frequency detecting means for detecting a high frequency amount that changes depending on the type, weight, and heating state of the food placed in the cooking chamber when the magnetron is driven, and the high frequency amount detected by the high frequency detecting means in the cooking chamber. To determine the high frequency distribution of the And a stirrer driving means for driving the stirrer driving motor to adjust the position of the stirrer according to the position determined by the control means.

In addition, the cooking control method of the microwave oven according to the present invention is a positioning step of setting the current position of the stirrer to the initial position at the time of high frequency generation by the driving of the magnetron, and at the initial position of the stirrer set in the positioning step. A high frequency detection step for detecting a high frequency output that changes according to the type, weight, and heating state of the food placed in the cooking chamber, and a high frequency distribution calculation step for calculating a high frequency distribution diagram in the cooking chamber according to the high frequency output detected in the high frequency detection step. And a position discrimination step for determining whether the position of the stirrer is a predetermined step preset in the control means when calculating the high frequency distribution diagram in the high frequency distribution calculation step, and the position of the stirrer determined in the position discrimination step. In the case of a predetermined step, the position of the stirrer is determined according to the high frequency distribution diagram calculated at each position of the stirrer. A stirrer positioning step for determining and a cooking step for cooking food placed in the cooking chamber by rotating the stirrer to a position determined by the stirrer positioning step and adjusting a dispersion direction of high frequency generated in the magnetron. It is characterized by.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIGS. 1 to 2, the cooking chamber 2 is formed at a predetermined portion inside the main body 1 so as to prevent the heat source applied to the food from flowing out to the outside, and the food chamber is placed thereon. The high pressure transformer 3 is mounted on the lower right end of the c) to generate a high pressure.

In addition, the magnetron 4 is mounted on the upper portion of the high voltage transformer 3 to generate a high frequency by receiving the high pressure from the high voltage transformer 3, and the magnetron 4 is generated on the left side of the magnetron 4. The waveguide 5 is formed to guide the high frequency into the cooking chamber 2.

The feeder of the waveguide 5 has a metal stirrer 52 for controlling the high frequency generated in the magnetron 4 in the radiation (dispersion) direction of the high frequency so that the high frequency generated evenly flows into the cooking chamber 2. The lower portion of the stirrer 52, the stirrer driving motor 51 for generating a driving force for rotating the stirrer 52 is mounted.

In addition, the lower end of the cooking chamber (2) is equipped with a rotary plate (7) to rotate the food in the cooking chamber (2) when the magnetron (4) is driven so that the food is cooked evenly, the lower end of the rotary plate (7) The rotary plate support roll 8 which supports the rotary plate 7 is attached.

At the lower end of the rotary plate support roller 8, a rotary plate driving motor 9 is generated which generates a driving force to rotate the rotary plate 7 when the magnetron 4 is driven.

In the drawing, four high-frequency sensors 41 to 44 are mounted on the left and right sides of the cooking chamber 2 so as to be symmetrical with each other, and the type, weight, and heating state of foods placed on the rotary dish 7 are shown in FIG. A high frequency that changes from time to time is detected.

A block diagram for controlling a cooking operation of the microwave oven configured as described above will be described with reference to FIG. 3.

As shown in FIG. 3, the DC power supply unit 10 receives commercial AC power from an AC power input terminal (not shown), converts and outputs a predetermined constant voltage required for driving the microwave oven, and outputs the cooking input means ( 20) is provided with a plurality of function keys on the control panel to input a cooking function (cooking time, cooking menu, microwave output, microwave start / stop, etc.) desired by the user.

The control means 30 receives the cooking input signal selected by the user by the cooking input means 20 and at the same time receives the high frequency detected by the high frequency detecting means described later, and displays the high frequency distribution diagram in the cooking chamber 2. By determining and determining the position of the stirrer 52 so that the high frequency is evenly distributed in the cooking chamber 2 according to the determined high frequency distribution, the overall cooking operation is controlled while controlling the driving of the magnetron 4. It's a microcomputer.

In addition, the high frequency detecting means 40 detects a high frequency that changes according to the type, weight and heating state of the food placed in the cooking chamber 2 and outputs the high frequency detecting means to the control means 30. 40 are four high frequency sensors 41 to 44 which are mounted symmetrically on the left and right sides so as to detect the amount of high frequency that changes with time in the cooking chamber 2.

Further, the stirrer driving means 50 moves the stirrer 52 to the position determined by the control means 30 according to the high frequency amount detected by the high frequency detection means 40, as shown in FIG. The stirrer driving motor 51 is driven to control the position of the stirrer 52 by rotating in eight stages.

In addition, in the drawing, the magnetron driving means 60 is constituted by a relay or the like which receives the control signal output from the control means 30 to supply or cut off the driving power of the magnetron 4, and the display means 70 is The cooking input means 20 displays the cooking time or cooking menu input by the user.

Hereinafter, an operation effect of the cooking control apparatus and method of the microwave oven configured as described above will be described with reference to FIG.

4 is a flowchart showing a cooking control operation procedure of the microwave oven according to the present invention. In FIG. 4, S denotes a step.

First, when power is supplied to the microwave oven, the DC power supply unit 10 receives commercial AC power from an AC power input terminal (not shown) and converts it into a predetermined constant voltage required for driving the microwave oven. Supply to the drive circuit.

Therefore, in step S1, the constant voltage supplied from the DC power supply means 10 is applied by the control means 30 to initialize the microwave oven in accordance with the cooking operation.

At this time, when the user places the food to be cooked on the rotating dish 7 in the cooking chamber 2 and then inputs the cooking menu and the cooking time with the cooking input means 20 and presses the cooking start button, the control in step S2 is performed. The means 30 outputs a control signal for controlling the driving of the magnetron 4 to the magnetron drive means 60.

Accordingly, the magnetron driving means 60 receives the control signal output from the control means 30 and turns on the relay so that commercial AC power from the AC power input terminal is applied to the high voltage transformer 3 to generate a high voltage.

When the relay is turned on, the magnetron 4 receives a high pressure from the high voltage transformer 3 to generate a high frequency, and the high frequency generated by the magnetron 4 is guided to the waveguide 5 to guide the waveguide 5. It is dispersed in the cooking chamber 2 while being interfered by the metal stirrer 52 mounted on the power supply port of.

At this time, the high frequency dispersed in the cooking chamber 2 is reflected on the metal wall, which is the structure of the cooking chamber 2, is applied to the food, or directly applied to the food while being placed on the rotating dish 7 to heat the rotating food. To start.

When the high frequency generated by the magnetron 4 is dispersed in the cooking chamber 2 and starts heating the food, the step S3 sets the predetermined position at which the stirrer 52 is currently positioned to zero (0). Step).

On the other hand, the high frequency generated in the magnetron 4 and distributed into the cooking chamber 2 is such that the amount of high frequency distributed in the cooking chamber 2 changes with time according to the change of the dielectric constant due to the kind, weight, and heating state of the food. In step S4, four high frequency sensors 41 to 44 mounted on the left and right walls of the cooking chamber 2 so as to be symmetrical with each other detect the high frequency inflow and dispersion in the cooking chamber 2, and the control means ( Output to 30).

Therefore, in step S5, the control means 30 has the maximum value Mmax and the minimum value Mmin among the high frequency output values detected by the four high frequency sensors 41 to 44, and is represented by the following formula (1). The high frequency distribution D in the cooking chamber 2 is calculated accordingly.

Distribution (D) = maximum value (Mmax)-minimum value (Mmin). … … … … … … … … … … … … … … (One)

As described above, when the high frequency distribution diagram DO is calculated in step 0, the control means 30 stores the current position step (step 0) of the stirrer 52 and the high frequency distribution diagram DO at this time in the memory. .

Subsequently, in step S6, the position step of the stirrer 52 is increased by one step, which is the fifth by 360 degrees / N angles (45 degrees) obtained by dividing 360 degrees by N equals (for example, N = 8). As shown in the figure, the stirrer 52 is rotated in a rotational direction (clockwise) to increase the position step of the stirrer 52.

In step S7, it is determined whether the position step of the stirrer 52 increased in step S6 is N (i.e., the step value of the state in which the stirrer returns to the initial position). This is to determine whether the minimum high frequency distribution diagram D is calculated at the position stage and find the position stage of the stirrer 52 in which the high frequency in the cooking chamber 2 is most evenly distributed.

As a result of the discrimination in step S7, when the position step of the stirrer 52 is not N (NO), the stirrer 52 does not return to the initial position. In step S71, the control means 30 ) Outputs a control signal to the stirrer driving means 50 for moving the stirrer 52 to the increased position step in step S6.

Accordingly, in the stirrer driving means 50, the stirrer driving motor 51 is driven by the control of the control means 30, so that the stirrer 52 is 360 degrees / N as shown in FIG. Rotate in the rotational direction (clockwise) by the angle of 45 °.

When the stirrer 52 completes the rotation by an angle of 360 ° / N, the process returns to the step S4 to calculate the high frequency distribution in the rotated position step, and the cooking chamber is operated by the four high frequency sensors 41 to 44. (2) The inflow-dispersed high frequency wave is detected and output to the control means 30.

Therefore, in step S5, the control means 30 has the maximum value Mmax and the minimum value Mmin among the high frequency output values detected by the four high frequency sensors 41 to 44 in the formula shown in the above formula (1). Accordingly, the high frequency distribution diagram D in the cooking chamber 2 is calculated.

As described above, when the high frequency distribution diagram D1 is calculated in the first stage, the control means 30 stores the current position stage of the stirrer 52 and the high frequency distribution diagram D1 at this time in the memory. .

Next, in step S6, the position step of the stirrer 52 is increased by one step, and in step S7, it is determined whether the position step of the stirrer 52 increased in step S6 is N.

As a result of the discrimination in step S7, when the position step of the stirrer 52 is not N (N0), the process returns to the step S71 and the operation of step S71 or less is repeated.

On the other hand, when the determination result at step S7 indicates that the position step of the stirrer 52 is N (YES), the stirrer 52 is returned to the initial position, and the control means 30 at step S8. Compares the position steps (0-7) of each of the stirrers 52 calculated in the step S4 to step S5 with the high frequency distribution diagrams D0 to D7 at this time.

As a result of the comparison, when the high frequency distribution diagram D is minimum, the position of the stirrer 52 is determined by the control means 30 by finding the position of the stirrer 52.

Therefore, in step S9, the control means 30 outputs a control signal for rotating the stirrer 52 to the position determined in step S8 to the stirrer driving means 50.

Accordingly, the stirrer driving means 50 drives the stirrer driving motor 51 under the control of the control means 30 to move the position of the stirrer 52 to the position determined by the control means 30. Rotate

When the stirrer 52 completes the rotation to the determined position, in step S10, the cooking input means 20 determines whether the cooking time set by the user has elapsed, and when the cooking time has not elapsed (NO day). Case), the process returns to step S2 to continue cooking operation.

On the other hand, when the cooking time has elapsed (YES) as a result of the determination in step S10, the control means 30 sends a control signal to the magnetron driving means 60 to cut off the driving power of the magnetron 4. Output to.

Therefore, the magnetron driving means 60 receives the control signal output from the control means 30 to cut off the driving power of the magnetron 4 to end the cooking operation.

In the above embodiment, the rotation direction of the stirrer is rotated in the clockwise direction and the position step of the stirrer is divided into eight stages to calculate a harmonic distribution diagram. The stirrer rotates counterclockwise as well as being not limited thereto, and the object and effect of the present invention can be achieved by dividing the stirrer's position step into eight or less steps or eight or more steps according to product specifications. .

In addition, in one embodiment of the present invention, four high-frequency sensors are mounted on the left and right walls of the cooking chamber so as to be symmetrical with each other in order to detect a distribution amount of the high frequency distributed in the cooking chamber, but the present invention is not limited thereto. Of course, the object and effect of the present invention can be achieved by arbitrarily varying the number of high-frequency sensors according to product specifications.

According to the cooking control apparatus and method of the microwave oven according to the present invention as described above, by adjusting the position of the stirrer in accordance with the change in the distribution of the high frequency inflow and dispersion in the cooking chamber, by changing the impedance, the type and weight of food And evenly distribute the high frequency in the cooking chamber irrespective of the change in dielectric constant due to the heating state, and in particular, it is possible to uniformly heat the food having no fluidity such as thawing of frozen food or pizza without partial heating. Therefore, there is an excellent effect that can maximize the use efficiency of high frequency energy.

Claims (10)

A cooking chamber having a predetermined space for placing food, a high voltage transformer for converting AC power input into the device into a high voltage, a magnetron generating high frequency by receiving the high voltage of the high voltage transformer, and a high frequency generated from the magnetron in the cooking chamber. In a microwave oven consisting of a waveguide for guiding a microwave, a stirrer for controlling the dispersion direction of high frequency generated in the magnetron, and changes depending on the type, weight and heating state of foods placed in the cooking chamber when the magnetron is driven. High frequency detection means for detecting a high frequency amount, control means for determining a position of the stirrer while determining a high frequency distribution diagram in the cooking chamber according to the high frequency amount detected by the high frequency detection means, and determined by the control means. Stirrer motor to adjust the position of the stirrer according to the position Cooking control apparatus of a microwave oven, which is characterized by being a stirrer drive means for driving. The microwave cooking control apparatus according to claim 1, wherein the stirrer is attached to a feed hole of the waveguide so as to adjust a dispersion direction of high frequency generated from the magnetron. The cooking control apparatus according to claim 1, wherein the stirrer is made of metal. The microwave oven according to claim 1, wherein the high frequency detecting means comprises four high frequency sensors for detecting the amount of high frequency which varies with time according to the type, weight and heating state of the food placed in the cooking chamber. Cooking control device. The cooking control apparatus according to claim 4, wherein the high frequency sensor is mounted on the left and right walls of the cooking chamber so as to be symmetrical to each other. Positioning step of setting the current position of the stirrer to the initial position at the time of high frequency generation by the driving of the magnetron, and type, weight and heating state of foods placed in the cooking chamber at the initial position of the stirrer set in the positioning step. A high frequency detection step for detecting a high frequency output that changes according to the step, a high frequency distribution calculation step for calculating a high frequency distribution diagram in the cooking chamber according to the high frequency output detected in the high frequency detection step, and a high frequency distribution diagram at the high frequency distribution calculation step A position discrimination step of determining whether or not the position of the stirrer is a predetermined step which is preset in the control means; and when the position of the stirrer determined in the position discrimination step is a predetermined step, calculation is performed at each position of the stirrer. A stirrer positioning step of determining the position of the stirrer according to the high frequency distribution diagram And a cooking step of cooking food placed in the cooking chamber by rotating the stirrer to a position determined in the forward step to adjust the dispersion direction of the high frequency generated in the magnetron. The cooking control method according to claim 6, wherein the stirrer is rotated clockwise by an angle corresponding to 1 / N divided by 360 °. 7. The electronic device as claimed in claim 6, wherein the high frequency detection step detects a high frequency output which varies according to the type, weight and heating state of the food at each position of the stirrer rotated by an angle corresponding to 1 / N. Cooking control method of the stove. The cooking control method according to claim 6, wherein the high frequency distribution calculating step calculates a high frequency distribution diagram according to a difference between the maximum value and the minimum value of the high frequency output detected by the high frequency detection step. The cooking control method of a microwave oven according to claim 6, wherein the stirrer positioning step determines a position of the stirrer at a point at which the high frequency distribution calculated in the high frequency distribution calculating step is minimum.