KR0139732B1 - Automatic cooking control device of microwave oven - Google Patents

Abstract

The present invention relates to an automatic cooking control apparatus for a microwave oven, which determines a total cooking time by calculating a time value set according to a type of food from the time point of the gas or steam change amount generated from food as a reference value. It prevents overheating due to delayed geographic time during continuous cooking and automatically controls cooking time regardless of the amount of food.

As described above, the present invention comprises the steps of setting the value of the time of change of the gas and steam temperature generated in the food at the start of cooking as a reference value, and reading the current gas and vapor temperature which is changed and input from the time of setting the reference value for a predetermined time. Comprising the step of calculating a reference value, multiplying the inverse of the operation value by a constant constant to convert the additional heating time, and operating the magnetron during the converted additional heating time to perform cooking to complete do.

Description

Automatic cooking control method and device of microwave oven

1 is a block diagram of a cooking control apparatus of a conventional microwave oven.

2 is a cooking time curve diagram according to the humidity and gas detection of the first temperature sensing member material.

3 is a block diagram of an automatic cooking control apparatus of the present invention microwave oven.

4 illustrates the FIG. 3 microprocessor in more detail.

5 is an output characteristic curve of the third temperature sensing member.

* Explanation of symbols for main parts of the drawings

202: microprocessor 203: temperature range adjustment means

202a: analogue / digital conversion means 202b: time generation means

202c: reference value storage means 202d: later value storage means

202e: calculation means 202f: time conversion means

206: load driving means 207: magnetron

The present invention relates to an automatic cooking control of a microwave oven, and more particularly, to automatically calculate the continuous heating time according to the type of food after the start of cooking without time delay and to prevent overheating phenomenon due to the cooking time delay during continuous cooking. In addition, the present invention relates to an automatic cooking control method and apparatus for a microwave oven to automatically control a cooking time of a food regardless of the amount of food.

In general, as shown in FIG. 1 of the accompanying drawings, the microwave oven outputs key data according to a user's selection of food type while cooking food, and displays a key operation and display unit 101 for displaying various states of the microwave oven. And the microcomputer 100 for controlling the entire operation of the system of the remaining range according to the type of food and the cooking time data selected and input from the key control unit 101, and the conduction according to the control signal of the microcomputer 100. A load driver 102 which cuts off and outputs a control voltage, a high voltage transformer 108 that boosts the output voltage of the load driver 102 to a high voltage, and is installed in the cavity 112 to output the load driver 102. The magnetron 113 is driven by the high voltage generated from the voltage and the high voltage transformer 108 to generate electromagnetic waves, and is installed in the inlet 109 of the cavity 112 and Cooling fan 110 for cooling the magnetron 113 and the high-pressure transformer 108 by suctioning external air through the inlet 109 by the operating voltage, and heating the food in the container with the electromagnetic waves generated from the magnetron 113. And a turntable motor 107 for rotating the turntable 106 by driving by the output voltage of the load driver 102 and the exhaust port 104 formed in the heating chamber 105. And an exhaust temperature sensing member 103 for sensing the exhaust temperature, and a signal processor 111 for processing the exhaust temperature signal detected by the exhaust temperature sensing member 103 and inputting the signal to the microcomputer 100.

In this way, the automatic cooking control device of the conventional microwave oven configured by the user first put the food to be cooked in the container in the heating chamber 105, select the type of cooking through the key operation and display unit 101, and then press the automatic cooking start key The microcomputer 100 drives the cooling fan 110 for a predetermined time through the load driving unit 102 to maintain the air temperature of the heating chamber 105 in an equilibrium state while introducing external air into the heating chamber 105. do.

As such, while the air temperature of the heating chamber 105 is maintained in parallel, the exhaust temperature detecting member 103 detects the air temperature in the heating chamber 105 exhausted through the exhaust port 104 and inputs the signal to the signal processing unit 111. The signal processor 111 processes the current air temperature detected by the exhaust temperature sensor 103 and inputs the signal to the microcomputer 100.

The microcomputer 100 drives the high voltage transformer 108 and the turntable motor 107 through the load driver 102 when the temperature of the air input from the signal processor 111 is determined to be in a parallel state. 108 boosts the output voltage of the load driver 102 to a high voltage to drive the magnetron 113.

Therefore, the magnetron 113 generates electromagnetic waves by the high voltage of the high voltage transformer 108 to gradually heat food in the heating chamber 105, and the cooling fan 110 outputs the output voltage of the load driver 102. The external air is sucked into the inlet 109 of the cavity 112 to cool the magnetron 113 and the high pressure transformer 108 and to continuously introduce the air into the heating chamber 105.

As the food is gradually heated by the electromagnetic waves of the magnetron 113, steam or gas is generated, and the steam or gas is exhausted from the heating chamber 105 together with the external air sucked by the cooling fan 110. Exhaust through 104.

At this time, the exhaust temperature detecting unit 103 installed in the exhaust port 104 of the heating chamber 105 detects steam or gas generated from food and inputs it to the microcomputer 100 through the signal processing unit 111.

As shown in FIG. 2, the microcomputer 100 searches for the amount of change in steam or gas detected by the exhaust temperature detecting unit 103 after the start of cooking.

When the amount of change of steam or gas from the exhaust temperature detecting unit 103 reaches a constant value, the additional heating time T2 is obtained by multiplying the time T1 by a constant value (K: constant) at that time. The magnetron 113 is driven through the load driver 102 to perform additional heating.

Thereafter, when the additional heating time T2 elapses, that is, when the entire cooking time T elapses, the driving of the magnetron 113 and the turntable motor 107 is stopped, and then the driving of the cooling fan 110 is stopped after a predetermined time. Cooking is completed.

However, the cooking time is determined by multiplying a constant constant by the time from the start of cooking of the conventional microwave oven until the amount of change in the food gas or steam reaches a constant value to determine the additional heating time, which determines the total cooking time. In this case, there is a problem in that the overheating phenomenon occurs due to the delay of the cooking time, and the control detection range is limited depending on the amount of food or the amount of food.

Accordingly, an object of the present invention is to set the value of the gas or steam change amount generated in the food after the start of the cooking in consideration of such a conventional problem as a reference value and to calculate the total cooking time by calculating the time and set according to the type of food from the time point The present invention provides a method and apparatus for automatically cooking control of a microwave oven to prevent overheating due to a delay in cooking time during continuous cooking and to automatically control the cooking time regardless of the amount of food.

As a method for achieving the object of the present invention, the step of setting the value of the time of change of the gas and steam temperature generated in the food at the start of cooking as a reference value, the current gas is changed and input from the time of setting the reference value and Reading the steam temperature for a predetermined time and calculating the reference value; multiplying the inverse of the calculated value by a constant constant to convert the additional heating time; and operating the magnetron for the converted additional heating time to perform cooking. Is achieved by the step of completing.

As a means for achieving another object of the present invention, the time point of the temperature change according to the heating of the food at the start of cooking is determined from the temperature sensing member as a reference value and a predetermined time set according to the type of food from the time point of the temperature change The microprocessor generates a control signal according to the microprocessor which redetects the current temperature value which is changed after the input and determines the total cooking time of the microwave according to these two values, and the temperature sensing member by the control signal obtained by the microprocessor. It is achieved by including a temperature range adjusting means for selectively adjusting the temperature sensing range of the following, when described in detail with reference to the accompanying drawings of the present invention.

3 is a block diagram of the automatic cooking control apparatus of the present invention, as shown in this, installed in the exhaust port of the heating chamber (not shown in the drawing) to detect the exhaust temperature according to the heating of food and corresponding voltage A temperature amplifying member 200 for outputting a voltage, a voltage amplifying means 201 for amplifying and outputting a voltage of the exhaust temperature detected by the temperature sensing member 200 to a set gain value, and the voltage amplifying means after the start of cooking start ( 201) detects a time point at which the voltage of the temperature changes, sets it as a reference value, and redetects the current temperature value from the voltage amplifying means 201 for a predetermined time set according to the type of food from the time of change of the temperature voltage. The microprocessor 202 and the control system obtained by the microprocessor 202 determine the total cooking time of the microwave oven according to these two values and generate a control signal accordingly. A temperature range adjusting means 203 consisting of a resistor R1-R4 and a switch SW1 for selectively adjusting the temperature sensing range of the temperature sensing member 200 by an arc; and a control signal of the microprocessor 202. Display means 204 for displaying various functions of the microwave oven, function selection means 205 for inputting various kinds of food and various functions into the microprocessor 202, and control signals of the microprocessor 202; A load driving means 206 for outputting an operating voltage by using the same, a magnetron 207 for heating food in a heating chamber by generating electromagnetic waves by the load driving means 206, and an operating voltage for the microprocessor 202. It consists of a power supply means 208 for supplying a.

As shown in FIG. 4, the microprocessor 202 includes time generation means 202b for generating a predetermined time clock according to the type of cooking selected by the function selection means 205, and the time generation means 202b. Analog / digital change means (202a) for converting the temperature voltage input from voltage amplifying means (201) into a digital signal and outputting the digital signal according to the time generated by the < RTI ID = 0.0 >), < / RTI > A reference value storing means (202c) for storing, as a reference value, a digital temperature value at the time when the temperature starts to change after the start of cooking from among the prepared temperature values, and a time generating means (202b) after the reference value is stored in the reference value storing means (202c). A later value storage means 202d for storing the temperature value of the last value converted and inputted by the analog / digital conversion means 202a after a predetermined time generated by the reference value storage means ( The inverse of the calculation means 202e for calculating the difference between the reference value stored in 202c and the later value stored in the later value storing means 202d and the value calculated by the calculation means 202e is multiplied by a constant and multiplied by the multiplied value. It is composed of time conversion means 202f for driving the magnetron 207 through the load driving means 206 in terms of the total cooking time.

Thus, when described in detail with reference to Figure 3 to Figure 5 the effect of the present invention configured as follows.

First, when a user puts food to be cooked in a container in a heating chamber, selects a cooking type through the function selection means 205, and then presses an automatic cooking start key, the microprocessor 202 initially loads the load driving means 206. The magnetron 207 is oscillated for a predetermined time to gradually heat food in the heating chamber.

Steam or gas is generated as the food is gradually heated by the electromagnetic waves generated by the magnetron 207, and the steam or gas is heated together with external air sucked by a cooling fan (not shown). Exhaust through the vent.

At this time, the temperature sensing member 200 installed in the exhaust port of the heating chamber detects the temperature of steam or gas generated from the food and inputs it to the voltage amplifying means 201 at a voltage corresponding thereto.

The voltage amplifying means 201 sufficiently amplifies the temperature voltage input from the temperature sensing member 200 and inputs it to the analog / digital converting means 202a of the microprocessor 202.

Here, the voltage amplifying means 201 may be deleted and the temperature voltage sensed by the temperature sensing member 200 may be directly input to the analog / digital converting means 202a.

The analog / digital converting means 202a converts the temperature voltage input from the voltage amplifying means 201 or the temperature sensing member 200 into a digital signal according to the time generated by the time generating means 202b to store the reference value. 202c or later value storing means 202d, wherein the analog / digital converting means 202a is detected by the voltage amplifying means 200 or the temperature sensing member 200, as shown in FIG. Using the digital value of the time T1 at which the temperature voltage starts to change in the positive direction as a reference value, the temperature value is stored in the reference value storage means 202c, and then the food type is selected from the time point T1 at which the temperature voltage changes in the positive direction. Accordingly, after a predetermined time T3 generated from the time generating means 202b has elapsed, the change amount ΔG of the temperature, which is changed from the voltage amplifying means 201 and is inputted, is converted into a digital signal and stored later ( Save to 202d) The.

In this way, when the reference value and the later value are completed, the calculation means 202e reads the reference value stored in the reference value storage means 202c and the later value stored in the later value storage means 202d, calculates these two values, and converts the difference values in time. Input to the means 202f.

The time converting means 202f calculates an additional heating time T2 by multiplying a reciprocal of the difference value input from the calculating means 202e by a constant constant α, and converts the obtained value into a total cooking time T. By driving the magnetron 207 through the load driving means 206 to complete the cooking.

The later value stored in the later value storage means 202d described above may be supplied directly to the calculation means 202e without being stored to be calculated with the reference value.

In addition, in FIG. 5, T1 is the time from the start of the stop to the time when the change in temperature sensed by the temperature sensing member 200 starts to change in the positive direction, and this depends on the amount or type of food.

And, T3 is a predetermined time in the predetermined time generating means 202b according to the type of food, ΔG is the amount of temperature change detected by the temperature sensing member 200 for a predetermined time (T3).

T2 is an additional heating time, which is a function of the temperature change amount ΔG.

Accordingly, the additional heating time T2 = f (1 / ΔG) may be represented by T2 = α × 1 / ΔG, and α may be a variable according to a constant or ΔG.

If the above description is expressed again as a formula, the total cooking time T is as follows.

T = T1 + T3 + T2 --------------------- (Equation 1)

T = T1 + T3 + f (1 / ΔG) --------------------- (Equation 2)

T = T1 + T3 + α × 1 / ΔG --------------------- (Equation 3)

Becomes

In the above, (α) is variable as a function of 1 / ΔG, and (3) is an equation when α is a constant.

On the other hand, the switch SW1 of the temperature range adjusting means 203 is connected to the fixed terminals b, c, d, and e by the control signal of the microprocessor 202, so that the temperature The sensing range of the temperature sensing member 200 is adjusted by the values of the sensing member 200 and the selected resistors R1-R4.

As described in detail above, according to the present invention, by setting the value of the gas or steam change amount of time generated from the food after the start of cooking as a reference value and determining the total cooking time by calculating the time and the time set according to the type of food from the time, Overheating due to delayed cooking time during continuous cooking is prevented and the cooking time can be automatically controlled regardless of the amount of food.

Claims (10)

Setting a value of a time point of change of gas and vapor temperature generated from food at the start of cooking as a reference value, and reading the current gas and vapor temperature change amount inputted from the time point of setting the reference value for a predetermined time and calculating the reference value; And multiplying the reciprocal of the calculated value by a constant and converting the cooking time into a cooking time, and operating the magnetron during the converted cooking time to perform cooking to complete the cooking time. . The method of claim 1, wherein the setting time varies depending on the type of food. The method of claim 1, wherein the setting time varies depending on the amount of food. At the start of cooking, the time of temperature change according to the heating of food is detected from the temperature sensing member as a reference value, and the amount of gas and steam temperature re-detected for the time set according to the type of food from the time of the temperature change, Microwave oven including a microprocessor for determining the overall cooking time of the range and generates a control signal according to the range, and a temperature range adjusting means for selectively adjusting the temperature sensing range of the temperature sensing member by the control signal obtained from the microprocessor Automatic cooking control system. The microprocessor of claim 4, wherein the microprocessor comprises: a time generating means for generating a clock according to a type of cooking, and an analog / output for converting and outputting a temperature signal input from a temperature sensing member into a digital signal according to a time obtained by the time generating means. A reference value storage means for storing, as a reference value, a digital conversion means and a digital temperature value at the time when the temperature starts to change after the start of cooking among the temperature values converted into digital by the analog / digital conversion means, and the reference value and time generating means. A calculation means for calculating a difference between the temperature value of the latter value obtained by a change in the analog / digital conversion means after a predetermined time of and multiplying the inverse of the value calculated by the calculation means by a constant constant and converting the product value to the total cooking time. And a time conversion means for driving the magnetron through the load driving means. Automatic cooking control system for microwave ovens. 5. The automatic cooking control apparatus according to claim 4, further comprising a voltage amplifying means for amplifying the temperature voltage value of the temperature sensing member to a predetermined level and inputting the same to the microprocessor. The automatic cooking control apparatus for a microwave oven according to claim 5, further comprising a later value storing means for storing the later value in the analog / digital converting means and supplying the latter value to the calculating means. The automatic cooking control apparatus of a microwave oven according to claim 5, wherein the time of the time generating means is generated differently according to the type of food. The method of claim 4, wherein the temperature range adjusting means is configured in accordance with a control signal obtained from the microprocessor comprises a switch for selectively connecting at least one or more resistors having different resistance values to the temperature sensing member. Microwave automatic cooking control device. 5. The automatic cooking control apparatus according to claim 4, wherein the total cooking time (T) satisfies the following condition. T = T1 + T3 + α × 1 / ΔG Under the above conditions, T1 is a time from the start of the stop to the time when the temperature starts to change, T3 is a time set according to the type of food, α is a constant, and ΔG is a temperature change amount.