KR20000025539A - Method of cooking popcorn in microwave oven - Google Patents

Abstract

PURPOSE: A popcorn cooking method is provided to cook popcorn by the frequency of the noise generated when the corn pops. CONSTITUTION: A popcorn cooking method using a microwave oven composed of a key input part(20), a display part(25), a sound sensor(10) and a filter circuit part(15) comprises the steps of: detecting the frequency of the noise generated when the corn pops for a certain period; judging if the detected frequency is the maximum value; and performing popcorn cooking until the minimum frequency is detected after detecting maximum value. Herein, optimally cooked popcorn is obtained if the popcorn cooking is finished when the frequency is under a certain value.

Description

How to control popcorn cooking in microwave oven

The present invention relates to a popcorn cooking control method of a microwave oven, and more particularly, to a popcorn cooking control method capable of obtaining an optimum popcorn dish.

In the conventional popcorn cooking control method, as shown in FIG. 1, when the popcorn key is selected, heating is started and the microphone is operated at step S1. In addition, the cooking sound of the popcorn input through the microphone is recognized and determined (step S2). In step S3, the cooking time is sensed to determine whether 3 minutes have elapsed.

When the cooking time has elapsed in the step S3, the heating is stopped while the cooking of the popcorn is completed, and when the cooking time has not elapsed in the step S3, the sound perceived through the microphone is at a predetermined ratio (at a maximum). 20% to 50%) to determine whether the step S4.

When the recognized sound is reduced from the maximum value by a certain ratio, step S5 of detecting a cooking time and continuing heating until the detected time is included between 1 minute and 3 minutes are S6 to continue cooking popcorn. Consists of steps

That is, in the conventional popcorn cooking, the popcorn is sensed by the microphone installed on one side of the cavity, and the popcorn cooking is continuously heated until the predetermined ratio is reduced from the maximum value of the detected sound volume.

But when popcorn is cooked, popcorn pops out, and the sound produced is a discrete sound, like the sound of a gun, not a continuous sound. Therefore, there is a problem that it is difficult to detect that the sound volume of popcorn splashing by using a microphone is reduced to a certain ratio from the maximum value.

Accordingly, an object of the present invention is to provide a popcorn cooking control method capable of controlling popcorn cooking by the frequency of sounds generated when the popcorn is fried.

1 is a flowchart illustrating a popcorn cooking control method in a conventional microwave oven;

2 is a hardware configuration diagram of a microwave oven for cooking popcorn according to the present invention;

3 is a flowchart illustrating a popcorn cooking control method of the microwave oven according to the present invention;

4 is an input waveform diagram of a sensor of the present invention.

Explanation of symbols on the main parts of the drawings

10: acoustic sensor 15: filter circuit

20: key input unit 25: display unit

30: load driver 35: microcomputer

Popcorn cooking control method for achieving the above object comprises the steps of detecting the frequency of the sound generated when the popcorn is fried for a certain period; Determining whether the detected frequency is the maximum; And after performing the maximum value detection, performing popcorn cooking until the frequency of the minimum value is detected.

The popcorn cooking control method of this invention is characterized by controlling popcorn cooking by the frequency of the sound which is fried when cooking popcorn.

Hereinafter, a popcorn cooking control method according to the present invention will be described in detail.

2 is a hardware configuration of the microwave oven for cooking popcorn according to the present invention.

The microwave oven of the present invention includes a key input unit 20 for inputting cooking information, a display unit 25 for displaying input contents and cooking time of the key input unit 20, and one side inside the cavity of the microwave oven. A sound sensor 10 for detecting a sound generated when the popcorn is fried, and a filter circuit unit 15 for filtering and outputting only the sound generated when the popcorn is fried among the signals output from the sound sensor 10; . The acoustic sensor 10 may use a piezo sensor.

And the microwave oven of the present invention measures the frequency of sound from the output signal of the filter circuit unit 15, and the microcomputer 35 for controlling each load in accordance with the input information of the key input unit 20, and the microcomputer Under the control of 35, a load driving section 30 for driving a magnetron, a motor, a lamp and the like as a heating source is included.

That is, when the popcorn key is input from the key input unit 20, the microcomputer 35 controls the load driver 30 to drive the magnetron as a heating source, and popcorn popping sounds detected from the acoustic sensor 10. Control your popcorn cooking by measuring the frequency of it.

Next, a popcorn cooking control method of the present invention having the above configuration will be described in detail with reference to the accompanying drawings.

3 is a flowchart illustrating a popcorn cooking control method of the microwave oven according to the present invention.

When the user selects the popcorn key through the key input unit 20, the microcomputer 35 recognizes that the input key is to perform popcorn cooking, and firstly controls the load driver 30 to drive the magnetron as a heating source. do. And as the popcorn cooking is performed, the set cooking time, cooking temperature, etc. are displayed on the display unit 25.

Thereafter, the popcorn placed in the cavity is flipped while the magnetron is driven, and the sound generated when the popcorn is flipped is detected by the acoustic sensor 10. The acoustic sensor 10 outputs the detected sound to the filter circuit unit 15, and the filter circuit unit 15 filters only the sound generated when the popcorn is splashed from the input sound signal and transmits the sound to the microcomputer 35. do.

In this process, a sound signal generated when popcorn is splashed into the microcomputer 35 is input. At this time, the sound signal detected by the acoustic sensor 10 and input to the microcomputer 35 is shown in Figure 4, a popcorn popping sound generated in the first section, b in the second section,. In N-th section, it becomes maximum. In the N + 1 section, Max-x points are reduced by the maximum number of x, ....., and in the N + n section, the Max-M points are reduced by M number. Where a <b <Max and x, n, N are any number.

That is, the frequency of the sound generated when the popcorn is fried while the heating source is heated gradually increases, and gradually decreases at a certain point to reach the minimum frequency.

Therefore, the microcomputer 35 counts the number of sounds detected from the acoustic sensor 10 for a predetermined period T (step 100), and when the value counted in the 100th step (ie, popcorn is fried). The frequency of the generated sound) is compared with the previously measured value to determine whether the currently detected value is large (step 102). That is, the step 102 detects that the frequency of the popping sound of the popcorn detected during the predetermined period becomes the maximum value.

Subsequently, the previously detected frequency is replaced with K '(step 104), and the operation of continuously detecting and comparing the frequency K of popping sounds for a predetermined period T is repeated until the maximum value is calculated. do.

By performing the above procedure, if the highest frequency of sound generated by popping popcorn for a certain period (T) is calculated, then the frequency of sound generated by popping popcorn for the predetermined period (T) is the highest. The process of calculating a low value is performed.

By repeating the steps 100-104, the previously detected frequency K 'is the highest maximum, and the currently detected frequency K is smaller than the maximum. In step 106, it is detected whether the currently detected frequency K is greater than the minimum value. In the step 106, the minimum value may be set to the minimum value among the frequencies detected in the detection operation of the maximum value previously, or may be set to a predetermined number before cooking.

When the frequency K currently detected in step 106 is greater than the minimum value, an operation of counting the number of sounds generated when the popcorn input from the acoustic sensor 10 is splashed for the next predetermined period is performed (108). step).

After the step 108, the operation of comparing the detected frequency greater than the minimum value in step 106 is repeated, where the frequency of the sound detected from the acoustic sensor 10 for the predetermined period T is the lowest. Detect.

When the frequency of the sound detected from the acoustic sensor 10 becomes the lowest during the predetermined period T, it is determined that cooking of the popcorn is completed (step 110).

That is, the present invention measures the frequency of sound generated while the popcorn is fried for a predetermined time T, and after the maximum value is detected, continuously controls the cooking of the popcorn until the minimum value is detected again.

As described above, the present invention controls the popcorn cooking by the frequency of sounds generated when the popcorn is squeezed. Therefore, when the popcorn is more and more popping sound at the point where the number of splashes is less than a certain number of times when the popcorn is finished, the popcorn cooked in the optimal state is effective.

Claims (1)

Detecting a frequency of sounds generated when popcorn is fried for a predetermined period; Determining whether the detected frequency is the maximum; And after the maximum value is detected, performing popcorn cooking until the frequency of the minimum value is detected.