KR950004848B1 - Microwave oven having smoke control apparatus - Google Patents

Abstract

The device for removing the smoke in a microwave oven includes: a heater for heating food in the heating room; a selection key for selecting the sort of the food; an exhaust port for discharging the waste gas generated while heating the selected food to outside; a temperature sensor mounted close to the outer side of the exhausting port and thereby sensing the temperature of the waste gas discharged to outside; light sensors for sensing the amount of the smoke generated in heating the food; a power supply for supplying power to drive the light sensors; an amplifier for amplifying the output signal of the light sensors which sense the amount of the smoke; and a micro computer for receiving the amplified sensing signals and controlling the cooking time of the electronic range and On/Off operation of the heater.

Description

Smoke removal control device and control method of microwave

1 is a detailed view showing the structure of a conventional microwave oven.

2 is a detailed view showing the structure of the microwave oven according to the present invention.

3 is a graph showing the relationship between the temperature distribution and the smoke generation rate of the exhaust gas generated in the heating chamber of the microwave oven of the present invention.

4 is a waveform diagram of an optical sensor mounted on the microwave oven of the present invention.

Figure 5 is a flow chart showing a smoke removal process of the microwave oven of the present invention.

* Explanation of symbols for main parts of the drawings

11: heating chamber 12: heater

13: selection key 14: exhaust vent

15: temperature sensor 16: microcomputer

17a, 17b: optical sensor 18: power supply

19: amplification unit

The present invention relates to a smoke removal control device and a control method of a microwave oven in which a temperature sensor and an optical sensor are mounted in a microwave oven to detect smoke generated when food is heated in a heating chamber so that a smoke below a predetermined level is maintained.

As shown in FIG. 1, a conventional microwave oven includes a heater 2 for heating food in the heating chamber 1, a selection key 3 for selecting food to be heated, and exhaust gas generated during heating of the selected food. It is composed of an exhaust port 4 for discharging to the outside, a temperature sensor 5 mounted close to the exhaust port 4 for sensing the temperature of the exhaust gas discharged to the outside, and a microcomputer 6 for controlling each part of the microwave oven. will be.

In the conventional microwave oven configured as described above, as shown in FIG. 1, after the power is applied to the microwave oven, when the user operates the selection key 3 to select food in the heating chamber 1, the microcomputer 6 By detecting this, the heater 2 is operated to heat food in the heating chamber 1.

At this time, when the exhaust gas generated from the food in the heating chamber 1 by the heater 2 is discharged to the outside through the exhaust port 4, the exhaust gas to the outside by the temperature sensor 5 mounted close to the exhaust port 4 The temperature of exhaust gas is sensed.

Therefore, when the temperature of the exhaust gas detected by the temperature sensor 5 is applied to the microcomputer 6 through a detection circuit not shown, the microcomputer 6 is heated according to the temperature of the exhaust gas detected by the temperature sensor 6. (2) to control the operation of the microwave oven by automatically setting the food heating time.

However, in the conventional microwave oven, the temperature sensor 5 can detect the temperature of the exhaust gas generated during the food heating in the heating chamber 1, but when the fish is heated in the heating chamber 1 is generated in the fish There was a problem that the unpleasant feeling is accompanied when other foods are heated by the smoke generated during the heating of the fish remaining in the heating chamber 1 and the smoke discharged to the outside through the exhaust port 4 because the smoke cannot be detected.

In order to solve the conventional problems, the present invention is equipped with a temperature sensor and an optical sensor in a microwave oven to set an optimal cooking time and detect the smoke generated during food heating to properly use the heat generated from the heater to heat the food. When the smoke is generated to maintain a certain level or less to remove the discomfort during cooking and to maintain the optimal cooking state to explain the configuration and effect of the present invention by the attached side as follows.

First, the microwave oven of the present invention, as shown in Figure 2, the heater 12 for heating the food in the heating 11, the selection key 13 for selecting the type of food to be heated, and the selected food heating An exhaust port 14 formed to discharge exhaust gas to the outside, a temperature sensor 15 mounted close to the outside of the exhaust port 14 to sense the temperature of the exhaust gas discharged to the outside, and generated when the food is heated. Optical sensors 17a and 17b for detecting the amount of smoke to be made, a power supply unit 18 for supplying power to drive the optical sensors 17a and 17b, and an optical sensor 17a for detecting the amount of smoke Amplifying unit 19 for amplifying the output signal of the (17b), and the microcomputer 16 to perform the cooking time of the microwave oven and the on / off control of the heater 12 by receiving the amplified amount of smoke detection signal Reference numeral R1 denotes a resistor and Q1 denotes a transistor.

On the other hand, the smoke removal control method of the microwave oven of the present invention, as shown in Figure 5, by driving the heater 12, the initial temperature (T1) and the changed time (Δt (t2-t1) in the heating chamber 11 The microcomputer 16 calculates the first process of detecting the elevated temperature T2 and the temperature rise width ΔT (T2-T1) of the initial temperature T1 and the elevated temperature T2 during In the second process of setting the cooking time, the third process of detecting the output voltage (Vo) of the light sensor (17a, 17b) for detecting the amount of smoke generated when the food heating, and the light sensor (17a, 17b) Comparing the output voltage Vo and the reference voltage V set in the microcomputer 16, the fourth process of driving the heater 12 to be turned off when Vo> V and turning on the heater 12 when Vo <V is performed. will be.

The operation and effect of the present invention configured as described above is shown in FIG. 2 and FIG. 5, after the power is applied to the microwave oven, when the user operates the selection key 13 to select the food type in the heating chamber 11. The microcomputer 16 detects this and operates the heater 12, thereby heating the food in the heating chamber.

At this time, when the exhaust gas generated during food heating is discharged to the outside through the exhaust port 14 formed in the heating chamber 11, the temperature sensor 15 mounted to the outside of the exhaust port 14 is shown in FIG. Similarly, after the initial temperature T1 is recognized, the temperature of the exhaust gas discharged through the exhaust port 14 during the changed time Δt is sensed to determine the magnitude of the load and the thawing state of the load, that is, the initial temperature T1 and the like. After sensing the rising temperature T2 after heating for the changed time Δt (t2-t1) and applying the changed temperature rising width ΔT (T2-T1) to the microcomputer 16, the microcomputer 16 calculates this. Set the optimum cooking time to heat the food. (The greater the load and the larger the temperature rise (△ T), the shorter the heating time.)

On the other hand, when the microcomputer 16 operates the heater 12 to heat food, the microcomputer 16 simultaneously drives the power supply unit 18 to supply power to the light emitting unit 17a and the light receiving unit 17b.

Powered photoelectric sensors 17a and 17b detect the amount of smoke generated during food heating.

In this case, as the amount of smoke detected by the photosensors 17a and 17b increases as shown in FIG. 4, the output voltage Vo increases, and the amplifier 19 amplifies them and applies them to the microcomputer 16.

Therefore, the microcomputer 16 compares the set reference voltage V with the output voltage Vo of the optical sensors 17a and 17b, and if the reference voltage V is less than the output voltage Vo, the microcomputer 16 smokes during heating of food. Is judged to have occurred, the operation of the heater 12 is turned off to suppress the generation of smoke, and if the reference voltage (V)> output voltage (Vo), the microcomputer 16 determines the amount of smoke in the heating chamber 11 at a predetermined level. By judging as follows, the heater 12 is turned on to heat food.

Thereafter, the food is heated for a predetermined heating time while repeatedly performing this, and the amount of smoke in the heating chamber 11 is kept below a predetermined level.

As described above, by installing the temperature sensor and light sensor in the microwave oven, the optimum cooking heating time is set to sense the amount of smoke generated during food heating, and the heater is repeatedly turned on and off to heat the food for the set heating time. When the amount of smoke generated in the food is kept below a certain level to eliminate the discomfort caused by the smoke during the food cooking, it is possible to proceed to the optimum cooking state has the effect of improving the reliability of the product.

Claims (2)

A heater 12 for heating food in the heating chamber 11, a selection key 13 for selecting a kind of food to be heated, an exhaust port 14 formed so that exhaust gas generated when heating the selected food is discharged to the outside, A temperature sensor 15 mounted close to the outside of the exhaust port 14 to sense the temperature of the exhaust gas discharged to the outside, and optical sensors 17a and 17b for detecting the amount of smoke generated when the food is heated; A power supply unit 18 for supplying power to drive the optical sensors 17a and 17b, an amplification unit 19 for amplifying an output signal of the optical sensors 17a and 17b that detects the amount of smoke; And a microcomputer (16) configured to receive the amplified amount of smoke detection signal and control the cooking time of the microwave and the on / off control of the heater (12). A first process of driving the heater 12 to sense the initial temperature T1 in the heating chamber 11 and the elevated temperature T2 during the converted time Δt (t2-t1), and the initial temperature T1 And a second process of setting the optimum cooking time by calculating the temperature rise width ΔT (T2-T1) of the rising temperature T2 and the light sensing the amount of smoke generated when the food is heated. A third process of detecting the output voltage Vo of the sensors 17a and 17b, and comparing the voltage Vo output from the optical sensors 17a and 17b with the reference voltage V set in the microcomputer 16 And if Vo &gt; V, the heater 12 is turned off, and if Vo &lt; V, the fourth step of driving the heater 12 is turned on.