KR0118078Y1 - Cooking control device of microwave oven - Google Patents

Abstract

The present invention relates to a cooking control apparatus for a microwave oven that performs an optimal cooking operation by detecting a reflected wave that changes according to the weight of food (cooking material) and calculating an appropriate cooking time. Control means for determining the weight of the food according to the reflected high frequency detected by the reflected wave detection means 40 for detecting the reflected high frequency that changes according to the above, as well as for calculating the optimum cooking time 30, and drive means 50 for supplying or cutting off the driving power of the magnetron 4 to generate a high frequency in accordance with the cooking time calculated by the control means 30, the weight of food By calculating the cooking time according to the optimum cooking operation can be achieved while the configuration is simple to reduce the manufacturing cost.

Description

Microwave Cooking Controller

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

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

3 (A) is a graph showing the reflected frequency changes with the weight of the food.

FIG. 3B is a graph showing the temperature change amount of the reflected wave absorber absorbing the reflected high frequency wave.

3 (C) is a graph showing the weight of the food changes according to the amount of temperature change.

3 (D) is a graph showing the cooking time calculated according to the weight of the food.

＊ Explanation of symbols on main parts of drawing

10: cooking input means 20: DC power supply means

30: control means 40: reflected wave detection means

41: reflected wave absorber 42: temperature sensor

50: drive means 60: display means

The present invention relates to a cooking control apparatus for a microwave oven that performs an optimum cooking operation by calculating an appropriate cooking time for detecting a reflected high frequency that changes according to the weight of food (cooking material).

In general, in a conventional microwave oven, the weight sensor detects the weight of food in the cooking chamber and outputs the detected weight data to the controller.

Accordingly, the control unit sets the cooking time according to the weight of the food detected by the weight sensor, and controls the oscillation of the magnetron by the set cooking time so as to dielectrically heat the food in the cooking chamber.

In addition, the gas (water vapor) generated from the food in the cooking chamber is detected by a gas sensor and outputs the detected data to the controller.

Accordingly, the control unit uses a method of controlling the cooking operation by determining the cooking state of the food in the cooking chamber and supplying or cutting off the driving power of the magnetron.

However, in such a method, since the weight sensor and the gas sensor must be simultaneously installed at a predetermined position in the microwave oven, there is a problem that the configuration is complicated and the manufacturing cost increases accordingly.

Therefore, the present invention has been made to solve the above problems, the object of the present invention is to determine the weight of the food by detecting the reflected frequency changes according to the weight of the food, and according to the determined weight of the food The present invention provides a cooking control apparatus for a microwave oven that calculates a cooking time to achieve an optimal cooking operation.

Another object of the present invention is not only simple configuration by attaching the reflection detection means for detecting the reflected high frequency changes according to the weight of food, but also by attaching the reflection wave absorber and the normal temperature sensor to the upper part of the waveguide outside the cooking chamber. The present invention provides a cooking control apparatus of a microwave oven which can reduce manufacturing costs.

In order to achieve the above object, a cooking control apparatus for a microwave oven according to the present invention includes a reflection detection means for detecting a reflection frequency that changes according to the weight of food in a microwave oven, and a reflection frequency detected by the reflection detection means. The control means for determining the weight of the food, as well as for calculating the optimum cooking time, and supplying or cutting off the driving power of the magnetron to generate a high frequency for cooking food according to the cooking time calculated by the control means. Characterized in that the drive means.

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

First, as shown in FIG. 1, the cooking chamber 2 is formed in 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 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 a high pressure from the high-voltage transformer 3, and the magnetron 4 is generated at the upper left side of the magnetron 4. The waveguide 5 is formed to guide the high frequency into the cooking chamber 2.

In addition, the reflection wave detection means 40 is mounted on the upper end of the waveguide 5 to detect the reflection wave which varies in inverse proportion to the weight of the food in the cooking chamber 2, which is generated by the magnetron 4 As the high frequency is guided through the waveguide 5 and dispersed in the cooking chamber 2, it is reflected in the cooking chamber 2 and returned to the waveguide 5, as shown in FIG. Likewise, if the weight of food placed in the cooking chamber 2 is large, the reflected high frequency is low. If the weight of the food is low, the reflected high frequency is high.

In addition, the rotary house 6 is mounted at the lower end of the cooking chamber 2 so that the food is evenly cooked by rotating the food in the cooking chamber 2 when the magnetron 4 is driven.

A block diagram for controlling a cooking operation of the microwave oven configured as described above will be described with reference to FIG. 2.

As shown in FIG. 2, the cooking input means 10 controls a plurality of function keys to input a cooking function (cooking time, cooking menu, output of the microwave, start / stop of the microwave, etc.) desired by the user. It is provided on the panel, the DC power supply means 20 receives the commercial AC power from the AC power input terminal (not shown) and converts it into a predetermined constant voltage required for driving the microwave oven.

And, the control means 30 receives the cooking input signal selected by the user by the cooking input means 10 and at the same time receiving the Vasa high frequency detected by the reflected wave detection means described later cooking time and cooking completion state of the food The microcomputer controls the overall cooking operation while controlling the driving of the magnetron 4 by determining.

In addition, the reflected wave detection means 40 detects the reflected high frequency which varies in inverse proportion to the weight of the food in the cooking chamber 2, so that the reflected wave detection means 40 generates the high frequency generated by the magnetron 4; When the light is guided through the waveguide 5 and dispersed in the cooking chamber 2, the reflected wave absorber 41 absorbs the high frequency reflected in the cook chamber 2, and the reflected high frequency wave absorbed by the reflected wave absorber 41. In order to determine the weight of the food according to the temperature changes in accordance with the reflected high frequency is composed of a temperature sensor 42 for outputting the detected temperature sensing data to the control means (30).

In addition, in the drawing, the driving means 50 receives the control signal output from the control means 30 to generate a high frequency in the magnetron 4 according to the cooking time calculated by the control means 30 and the magnetron ( And a relay for supplying or interrupting the driving power of 4), and the display means 60 includes a cooking time or cooking set in the control means 30 in accordance with the reflected high frequency detected by the reflected wave detection means 40. In addition to displaying the status, a cooking time or cooking menu input by the user is displayed by the cooking input 10.

Hereinafter, the effect of the cooking control apparatus of the microwave oven configured as described above will be described.

First, when the microwave power is supplied, the DC power supply unit 20 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 control unit 30 and each driving circuit. Supply to the furnace.

Therefore, the control means 30 receives the constant voltage supplied from the DC power supply means 20 and initializes the microwave oven according to the cooking operation.

At this time, when the user places the food to be cooked on the rotating dish 6 in the cooking chamber 2 and then presses the start button of the cooking input means 10, the high voltage transformer 3 is connected to an AC power input terminal (not shown). The commercial AC power is applied to generate a high pressure, and the control means 30 outputs a control signal for controlling the driving of the magnetron 4 to the driving means 50.

Therefore, the drive means 50 receives the control signal output from the control means 30 to turn on the relay to supply the drive power of the magnetron (4).

Accordingly, the high frequency is generated by applying the high pressure from the high pressure transformer 3 in the magnetron 4, and the high frequency generated in the magnetron 4 is guided into the cooking chamber 2 through the waveguide 5 and dispersed therein. do.

At this time, the high frequency dispersed in the cooking chamber (2) is reflected by the side of the cooking chamber (2) is applied to the food, or directly applied to the food while being placed on the rotating dish (6) to start cooking the rotating food.

When the high frequency generated in the magnetron 4 is dispersed in the cooking chamber 2, the reflected high frequency reflected in the cooking chamber 2 and returned to the waveguide 5 is absorbed by the reflected wave absorber 41.

When the reflected high frequency wave is absorbed by the reflected wave absorber 41, the temperature of the reflected wave absorber 41 increases, and the temperature sensor 42 senses this and outputs the detected temperature data to the control means 30.

At this time, when the weight of food in the cooking chamber 2 is large, since the high frequency generated in the magnetron 4 is absorbed by the food much, as shown in FIG. 3 (A), by the reflected wave absorber 41 The reflected high frequency wave is reduced.

On the other hand, if the amount of food in the cooking chamber 2 is small, since the high frequency generated in the magnetron 4 is absorbed by the food, the reflected wave absorber 41 as shown in FIG. The amount of reflected high frequency absorbed by the wave increases.

As such, the temperature of the reflected wave absorber 41 changes according to the amount of reflected high frequency absorbed inversely proportional to the weight of the food, which is monitored by the temperature sensor 42.

When the amount of reflected high frequency absorbed by the reflected wave absorber 41 decreases, as shown in FIG. 3 (B), the temperature change amount ΔT1 of the reflected wave absorber 41 sensed by the temperature sensor 42. The smaller the reflected high frequency amount is, the larger the amount of change of temperature DELTA T2 of the reflected wave absorber 41 detected by the temperature sensor 42 is, as shown in FIG.

As described above, when the temperature sensor 42 senses a change in temperature of the reflected wave absorber 41 and outputs the detected temperature data to the control means 30, the control means 30 transmits to the temperature sensor 42. The analog signal of the detected temperature data is converted into digital.

Then, the temperature change amount T for a predetermined time (to) is calculated by the temperature data converted into digital, and then the calculated temperature change amount T is expressed in the following equation (Fig. 3 (C)). The weight of food (W) is calculated according to the formula shown in the weight calculation formula obtained from the inverse graph of the temperature change and the weight of the food.

W = -a DELTA T + b... … … … … … … … … ①

Thus, with the calculated weight of food (W), the optimum cooking time according to the formula shown in the following formula ② (calculation of the cooking time that varies depending on the weight of the food shown in Figure 3 (D)). (ts) is calculated and a control signal for controlling the driving of the magnetron 4 is output to the driving means 50.

ts = CW... … … … … … … … … ②

Therefore, the magnetron 4 generates a high frequency by the cooking time ts calculated by the control means 30 to cook the food in the cooking chamber 2.

As the cooking time ts calculated by the control means 30 gradually passes, the amount of water vapor generated from the food in the cooking chamber 2 begins to increase, which is reflected in the cooking chamber 2 to cause the waveguide 5 As the reflected high frequency returned to the inside strikes water vapor, the waveform of the reflected high frequency starts to change little by little.

At this time, when the cooking time ts calculated by the control means 30 passes completely, the amount of water vapor generated in the food in the cooking chamber 2 is maximized, and thus is reflected in the cooking chamber 2. The waveform of the reflected high frequency changes greatly.

Accordingly, the control means 30 determines that the food in the cooking chamber 2 is cooked according to the reflected high frequency detected by the reflected wave detection means 40, and controls to cut off the driving power of the magnetron 4. The signal is output to the driving means 50.

Therefore, the driving means 50 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.

According to the cooking control apparatus of the microwave oven according to the present invention as described above, the weight of the food is determined by detecting the reflected high frequency that changes according to the amount of food, and the appropriate cooking time is determined according to the weight of the determined food. It has the effect of making the optimum cooking operation by calculating, and the reflection detection means for detecting the reflected high frequency changing according to the weight of food is composed of the reflection wave absorber and the normal temperature sensor and attached to the upper part of the waveguide, which is outside the cooking room. Not only is it simple, it also has an excellent effect of reducing the consumption costs.

Claims (2)

In the microwave oven, the reflected wave detection means 40 for detecting the reflected high frequency that changes in accordance with the weight of the food and the reflected high frequency detected by the reflected wave detection means 40, as well as determine the weight of the food It consists of a control means 30 for calculating the cooking time and a drive means 50 for supplying or interrupting the driving power of the magnetron 4 to generate a high frequency in accordance with the cooking time calculated by the control means 30. Microwave cooking control device. The reflected wave detector (41) according to claim 1, wherein the reflected wave detection means (40) absorbs high frequencies reflected in the cooking chamber (2) when the high frequency generated in the magnetron (4) flows into the cooking chamber (2). ) And a temperature sensor 42 which senses the temperature of the reflected wave absorber 41 which changes according to the reflected high frequency absorbed by the reflected wave absorber 41 and outputs the detected temperature data to the control means 30. Microwave cooking control device characterized in that the configuration.