KR19990035657A - How to display available voltage of microwave - Google Patents

Abstract

The present invention relates to a method for displaying the usable time of a microwave oven. In the related art, only a cooking time is increased / decreased when a power supply voltage changes to cope with a change in power supply voltage. In this case, the output of the magnetron is weak, and the cooking is not performed properly, and the system also malfunctions.

Therefore, the present invention selectively compares the digitally converted power supply voltage (A / D value) and the usable maximum voltage (V'max) and usable minimum voltage (V'min) preset by the experiment (S1). (S4); If the digital power supply voltage is greater than the maximum usable voltage, indicating that the power supply voltage is greater than or equal to the threshold voltage through the display unit and stopping the cooking process (S2) (S3); If the digital power supply voltage is smaller than the minimum available voltage, the display unit indicates that the power supply voltage is less than the minimum voltage and stops cooking process sequentially by performing steps S5 and S3. It will prevent or malfunction in advance.

Description

How to display available voltage of microwave

The present invention relates to a method for displaying a usable voltage of a microwave oven, and more particularly, to detect a change in a power supply voltage and display the change voltage, and to automatically drive the system when the voltage is above the maximum voltage or below the minimum voltage. A method of displaying the usable voltage of a microwave oven which is turned off to prevent the cooking state from being deteriorated due to the change of the output of the magnetron due to the change of the power supply voltage, and to prevent the damage of the system due to the high voltage and the malfunction of the system due to the low voltage. will be.

In general, a microwave oven is an electronic device that cooks food using high frequency oscillated from a magnetron, and includes a thawing function, a warming function, and a cooking function by a multi-stage output of the magnetron.

In addition to the magnetron, there is a grill cooking function using a heater and a combination function using a heater and a magnetron at the same time. There is also an oven function for circulating hot air inside a cooking chamber with a convection heater and a convection pan installed at the rear of the cooking chamber.

In such a microwave oven, the cooking method is a sensor type automatic cooking control method that detects humidity generated from a food according to heating by using a humidity sensor and automatically controls cooking time, and cooking amount according to cooking name and serving. There is a program type automatic cooking control method that finds the cooking time set by experiment in advance and controls the heating during the cooking time by manually inputting.

In order to cook in a microwave oven as described above, the food is put into the cooking chamber with the power connected, the door is closed, the output level is selected, the cooking function is selected, and the start key is pressed to start cooking.

When the microwave oven is installed and the cavity lamp is being installed, the cavity lamp is turned on when cooking, and the cooking state of the food can be checked from the outside, and the food can be easily introduced into or taken out of the cooking chamber before or after cooking. The cavity lamp will automatically light when the door is opened.

In addition, when cooking food using a general microwave oven as described above, the user inserts the food into the cooking chamber while the user is already familiar with the cooking state of the food, and manually the cooking time and the output level of the magnetron from the outside. To adjust the cooking.

On the other hand, the cooking apparatus according to the fluctuation of the power supply voltage in the general battery range as described above is as shown in FIG.

As shown therein, the transformer 1 for lowering the incoming voltage, the diode D1 for half-wave rectifying the DC voltage induced to the secondary side of the transformer 1, and the half-wave rectified in the diode D1. The voltage divider resistor R1 (R2) for dividing the voltage and the voltage divided by the voltage divider resistor R1 (R2) are transmitted to the A / D port, converted into a digital signal, and according to the change of the converted digital voltage. A microcomputer 2 for changing cooking data to proceed with cooking, a key input unit 4 for inputting respective functions such as a cooking function, a warming function, a thawing function, etc. to the micom 2, and It is composed of a display unit 3 for displaying the cooking time, cooking menu and the like under control.

The cooking apparatus according to the conventional power source voltage variation configured as described above first drops the DC voltage applied from the transformer 1, and the diode D1 half-wave rectifies the DC voltage induced to the secondary side of the transformer 1. . The half-wave rectified DC voltage (power supply voltage) is divided by the voltage divider R1 and R2 and applied to the analog / digital port (A / D port) of the microcomputer 2.

Then, the microcomputer 2 determines whether the power supply voltage applied to the analog / digital port (A / D port) is changed, and if the power supply voltage is changed, the cooking data recorded on the ROM is changed in the power supply voltage. In order to proceed with cooking by adding / subtracting to.

Meanwhile, when power is supplied to the system, the key input unit 4 transmits a function (menu, warming function, thawing function, cooking time setting, etc.) operated by the user to the microcomputer 2, and the display unit 3 is Under the control of the microcomputer 2, a menu or cooking time selected by the user is visually displayed.

However, the conventional microwave oven overcomes cooking errors caused by fluctuations in the power supply voltage by converting the cooking data by adding / decreasing the cooking data when the power supply voltage is changed, but does not display a separate usage limit voltage. In the case of drawing above the set threshold voltage or below the set minimum threshold voltage, the output of the magnetron is changed, resulting in a problem of poor cooking.

In particular, when the incoming power supply voltage is above the set limit voltage, the system is damaged by overvoltage. When the incoming power supply voltage is below the set minimum limit voltage, the microcomputer malfunctions and the cooking becomes poor. It was.

Accordingly, an object of the present invention is to provide a method of displaying a usable voltage of a microwave oven, which detects a change in power supply voltage and displays the change in voltage.

Another object of the present invention, if the incoming power supply voltage is above the maximum use voltage or below the use minimum voltage, the drive of the system is automatically turned off, and the output of the magnetron is changed due to the change of the power supply voltage to prevent the cooking state from being bad. The present invention provides a method for displaying available voltage of a microwave oven.

Still another object of the present invention is to provide a method of displaying a usable voltage of a microwave oven, which prevents a system from being damaged due to a high voltage and a malfunction of a system caused by a low voltage when a power supply voltage is changed.

An object of the present invention as described above comprises the steps of: selectively comparing the power supply voltage converted into digital and the available maximum voltage and the minimum available voltage which are preset by the experiment; If the digital power supply voltage is greater than the maximum available voltage, indicating that the power supply voltage is greater than or equal to the threshold voltage and stopping the cooking process; If the digital power supply voltage is less than the minimum available voltage, indicating that the power supply voltage is less than or equal to the minimum voltage through a display unit and stopping cooking; When the digital power supply voltage is present between the maximum available voltage and the minimum available voltage, the step of performing cooking by changing the cooking time according to the power supply voltage variation is sequentially performed.

1 is a block diagram of a cooking apparatus according to a change in power supply voltage of a conventional microwave oven;

2 is a configuration diagram of a usable voltage display device of a microwave oven to which the present invention is applied;

Figure 3 is a flow chart showing a method of displaying the available voltage of the microwave oven according to the present invention.

Explanation of symbols for the main parts of the drawings

5: trance 6: micom

7: key input unit 8: display unit

9: power control unit

BEST MODE Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is a block diagram illustrating an available voltage display device of a microwave oven to which the present invention is applied.

As shown therein, a transformer 5 for lowering the input power supply voltage, a diode D2 for half-wave rectifying the power supply voltage induced to the secondary side of the transformer 5, and a half-wave rectification in the diode D2. The divided resistors R3 and R4 for dividing the supplied power supply voltage and the power supply voltage divided by the divided resistors R3 and R4 are converted into digital power supply voltages, and the converted digital power supply voltages are measured in advance by experiment. The microcomputer 6 selectively controls the set maximum available voltage and the minimum available voltage, and controls the power at the same time, and controls the progress of cooking, and the cooking function, the warming function, the thawing function, etc. Under the control of the microcomputer 6, a key input unit 7 for inputting various functions and cooking time, a display unit 8 for visually displaying the state of the power voltage under the control of the microcomputer 6, and Ex input If the source voltage is above the usable maximum voltage or below the usable minimum voltage, the power control unit 9 blocks the supply of the power supply voltage to the system.

3 is a flowchart illustrating a method of displaying an available voltage of a microwave oven according to the present invention.

As shown in the drawing, comparing the digital power supply voltage (A / D value) detected when cooking is started with the maximum usable maximum voltage V'max calculated by the experiment (S1) and the digital power supply voltage. If the display is greater than the maximum available voltage step (S2) indicating that the display unit is above the threshold voltage, and displaying the above threshold voltage and stopping the cooking process (S3), and the digital power supply voltage is used Comparing the digital power supply voltage with the minimum usable voltage V'min previously calculated by the experiment when the voltage is smaller than the maximum possible voltage (S4); and the threshold voltage when the digital power supply voltage is smaller than the minimum available voltage. Displaying the under-display on the display unit (S5) and if the digital power supply voltage is between the usable maximum voltage and the usable minimum voltage, Retrieving whether or not the time is adjusted (S6), and when the user manually changes the cooking time in step S6, performing cooking according to the changed cooking time (S7), and changing the power voltage. If the user does not manually change the cooking time step (S8) to check whether the power voltage fluctuation amount increases the cooking time, and if the power voltage fluctuation amount decreases the cooking time, and extracts the cooking data from the cooking data on the ROM And reducing the cooking time accordingly (S9) (S10), and if the amount of change in the power supply voltage increases the cooking time, extracting the cooking data from the cooking data on the ROM and increasing the cooking time accordingly (S11). S12 and changing the cooking time according to the amount of change in the power supply voltage, and then proceeding cooking according to the cooking time (S13).

Referring to Figures 2 and 3 attached to the available voltage display method of the microwave oven according to the present invention made as described above in detail as follows.

First, when a user puts food on a tray in a cooking chamber, closes a door, operates a function key provided in the key input unit 7, selects a desired function, and presses a start key. Recognize and perform the cooking function for the entire cooking time.

At this time, the transformer 5 drops the input power supply voltage, and the diode D2 half-wave rectifies the power supply voltage induced to the secondary side of the transformer 5. The half-wave rectified power supply voltage is divided by the voltage divider R3 and R4 and applied to the analog / digital port A / D of the microcomputer 6.

Then, the microcomputer 6 uses the digital power supply voltage (A / D value) applied to the analog / digital port (A / D) to experiment with the maximum usable maximum voltage (V'max) and the minimum usable voltage (V). 'min) to selectively control the overall cooking.

That is, when cooking starts, the digital power supply voltage (A / D value) detected and the maximum usable maximum voltage (V'max) calculated by the experiment are compared (S1), and the digital power supply voltage (A / D value) is compared. If it is greater than the maximum available voltage, the display unit 8 indicates that the threshold voltage or more (S2), the cooking process is stopped (S3).

In this case, when the power supply voltage is higher than the limit voltage, the display unit 8 displays Po-HI so that the user can easily recognize that the power supply voltage is overvoltage. When the power supply voltage is recognized as the overvoltage, the micom 6 ) Controls the power supply control unit 9 to prevent the input power supply voltage from being supplied to the system. This is to prevent the system if the overvoltage is supplied as it is, since the system may be damaged.

On the other hand, when the digital power supply voltage is smaller than the maximum usable voltage (V'max), the digital power supply voltage (A / D value) is compared with the minimum usable minimum voltage (V'min) calculated by experiment. In operation S4, when the digital power supply voltage is smaller than the minimum voltage available for use, the display device 8 displays a lower limit voltage on the display unit 8 (S5) and stops the cooking process (S3).

In this case, when the power supply voltage is below the limit voltage, the display Po 8 displays a letter of Po-LO so that the user can easily recognize that the power supply voltage is low voltage and operate the power control unit 9 as described above. If the power supply voltage below the minimum available voltage is supplied to the system, it will cut off the output of the magnetron when the low voltage is supplied to the microcomputer (6) or other system, but the cooking may not be performed properly due to the possibility of malfunction of the parts. Because it does not.

On the other hand, if the digital power supply voltage is present between the maximum available voltage and the minimum available voltage to search whether the user adjusts the cooking time manually (S6), if the user changes the cooking time manually the changed cooking Cooking will proceed according to the time (S7).

In addition, when the user does not manually change the cooking time when the power voltage fluctuates, it is checked whether the power voltage fluctuation amount increases the cooking time (S8). After extracting the cooking data and reducing the cooking time accordingly (S9) (S10), the cooking is performed according to the reduced cooking time (S13).

In addition, when the amount of change in the power supply voltage is increased in cooking time, the corresponding cooking data is extracted from the cooking data on the ROM, and the cooking time is increased accordingly (S11) (S12), and the cooking is performed according to the increased cooking time. (S13).

Here, since the change of the cooking time changes the output of the magnetron in proportion to the variation of the power voltage, if the variation of the power voltage increases within the set range, the cooking time is increased and the variation of the power voltage is within the set range. If the decrease in, the cooking time is changed in a direction of decreasing the cooking time.

As described above, the present invention detects an amount of fluctuation of the power supply voltage, and if the power supply voltage is greater than the maximum available voltage or less than the minimum available voltage, displays the display on the display and stops cooking at the same time. It is possible to fundamentally solve the problem that cooking is not performed properly due to a change in the power supply voltage by blocking the supply to the system, and also prevents damage to the system due to overvoltage or malfunction of the system due to low voltage.

In addition, there is an advantage in that the user can easily notify the user of the change in the power supply voltage through the display unit, thereby providing convenience for the user's follow-up.

Claims (3)

Selectively comparing the digitally converted power supply voltage (A / D value) with the usable maximum voltage (V'max) and the minimum available voltage (V'min) preset by the experiment (S1) (S4) ; If the digital power supply voltage is greater than the maximum usable voltage, indicating that the power supply voltage is greater than or equal to the threshold voltage through the display unit and stopping cooking (S2) (S3); When the digital power supply voltage is smaller than the minimum available voltage, it is possible to use a microwave oven, which indicates that the power supply voltage is lower than or equal to the minimum voltage through the display unit and stops the cooking process (S5) and S3. Voltage display method. The method according to claim 1, further comprising the step (S6-S13) of proceeding with cooking by changing the cooking time according to the power supply voltage variation when the digital power supply voltage is between the available maximum voltage and the available minimum voltage. Available voltage display method of the microwave oven, characterized in that made by. The method of claim 2, wherein if the digital power supply voltage is present between the maximum available voltage and the minimum available voltage, searching for whether the user controls the manual cooking time (S6), and in step S6, If the cooking time is changed manually, the process of cooking according to the changed cooking time (S7), and if the user does not manually change the cooking time when the power voltage changes, whether the change in the power voltage increases the cooking time. Checking (S8), and when the amount of change in the power supply voltage decreases the cooking time, extracting the cooking data from the cooking data on the ROM and reducing the cooking time accordingly (S9) (S10); If the amount of change increases cooking time, extracting the cooking data from the cooking data on the ROM and increasing the cooking time accordingly (S11) (S12). And changing the cooking time according to the variation of the power supply voltage and then proceeding cooking according to the cooking time (S13).