KR0131953B1 - Operation control device & method of a microwave oven - Google Patents

Abstract

The malfunction control device and method of a microwave oven is directed to sense the type of a tray which is selectively used in accordance with a cooking function by using weight sensors, to thereby prevent a misuse of the tray. The malfunction control device includes a first weight sensor(WS1) formed on the bottom surface of a cooking chamber of the microwave oven for sensing the weight of a glass tray(1); and a second weight sensor(WS2) separated by a predetermined interval from the first weight sensor(WS1) for sensing the weight of an enameled tray(5), whereby when the tray which is not adequate to the cooking type is used, the driving of the microwave oven is stopped and an indication of the misuse of tray is displayed.

Description

Microwave malfunction control device and control method

1 is a configuration diagram of a malfunction control apparatus for a microwave oven according to the present invention.

2 is a cross-sectional view showing the position of the glass tray and the weight sensor according to the present invention.

3 is a cross-sectional view showing the position of the enamel tray and the weight sensor according to the present invention.

4 is a flowchart of a malfunction control method of the microwave oven according to the present invention.

＊ Explanation of symbols for main parts of drawing

CM: Convection Motor CL: Cavity Lamp

GM: Turntable Motor FM: Fan Motor

H.V.T: High pressure transformer L.V.T: Low pressure transformer

SW1, SW2: Primary and Secondary Door Switch M-SW: Monitor Switch

RY1: Convection Motor Relay RY2: Start Relay

RY3: Output control relay RY4: Heater relay

PCB: Control Circuit Board WS1, WS2: Weight Sensor

1: glass tray 2: roller guide

3,6: wheels 4,7: hub

5: enamel tray 10: cooking chamber

15: bottom

The present invention relates to an automatic cooking control method for a microwave oven. In particular, the type of tray selected according to the cooking function of the microwave oven is detected using a weight sensor to prevent misuse of the microwave oven. It relates to a malfunction control device and a control method. In general, a microwave oven is a heating means, in addition to a magnetron, a grill heater, a convection heater, and a convection fan are installed for multi-functional use. The convection function includes a heater installed in a ceiling of a cooking chamber or a convection heater installed in a convection cover on a rear wall of a cooking chamber. By rotating the convection fan by the convection motor while driving, the hot air is circulated inside the cooking chamber to cook by the oven function. When cooking food by heating the heating means such as magnetron and heater as described above, the automatic cooking control is to control the cooking time, that is, the heating time, the automatic cooking method and the program type by the sensor type There is an automatic cooking method by the sensor type. The automatic cooking method of the sensor type is an automatic cooking control method which automatically detects the humidity generated from the food according to the heating by using a humidity sensor and automatically controls the cooking time. Is an automatic cooking control method that finds the cooking time defined by the experiment in advance by manually inputting the cooking amount according to the cooking name and the number of people, and performs heating control during the cooking time. As such, the method of selecting automatic cooking using the microwave is recorded in detail in the instruction manual and attached to the microwave oven at the time of sale. However, even if the microwave oven is attached to the user's manual when selling the product, the consumer cannot fully understand the contents of the user's manual, and even if the product is in a normal state, the product does not operate due to immature use of the consumer. In the case of product failure may be mistaken, and also may cause a failure of the product due to inexperienced use, which has a problem that lowers the life and reliability of the product. Therefore, the present invention was devised to solve the above-mentioned problems of the prior art, and it is possible to prevent the malfunction of the microwave oven when the user does not select the tray according to the function selection by using in a state in which the user does not know the instruction manual. It is an object of the present invention to provide a malfunction control apparatus and a control method of a microwave oven. The present invention for achieving the above object, the first weight sensor for sensing the weight of the glass tray and the second weight sensor for sensing the weight of the enamel tray on the bottom of the microwave cooking chamber By installing at predetermined intervals, when using the tray does not fit the type of cooking is stopped, the microwave oven is stopped, characterized in that configured to display the misuse of the tray on the display. Hereinafter, with reference to the accompanying drawings, the present invention will be described in detail. As illustrated in FIG. 1, in the microwave malfunction control apparatus according to the present invention, one end of the input power AC input through the line filter is provided through the magnetron thermostat MTH and the primary door switch SW1. It is connected to one end of the high voltage transformer HVT, and the other end of the input power source AC is through the contact A of the start relay RY2 and the contact A of the output control relay RY3 after the secondary door switch SW2. It is connected to the other end of the high voltage transformer (HVT). The rear end of the magnetron thermostat (MTH) is connected to the primary side of the low-voltage transformer (LVT), and the output terminal of the secondary side of the low-voltage transformer (LVT) is connected to each power supply terminal such as a controller of the control circuit board (PCB). . The cavity lamp CL is connected between the rear end of the magnetron thermostat MTH and the rear end of the contact A of the start relay RY2, and the primary door switch SW1 and the secondary door switch SW2 are connected to each other. The turntable motor GM and the monitor switch M-SW are connected to the rear end of the fan motor, and the fan motor FM is connected in parallel, and one end of the heater H is connected to the rear end of the primary door switch SW1. The other end of the heater (H) is connected to the other end of the input power source (AC) through the contact A of the cavity thermostat (CTH) and the heater relay (RY4), the rear end of the magnetron thermostat (MTH) is a convection motor It is connected to one end of the CM, and the other end of the convection motor CM is connected to the primary side middle tap of the low pressure transformer LVT through the contact A of the convection motor relay RY1. On the bottom surface 15 of the microwave cooking chamber 10, a first weight sensor WS1 capable of sensing the weight of the glass tray 1 and a second weight capable of sensing the weight of the legal tray 5 are provided. By installing the detection sensor WS2 at predetermined intervals, the use of the tray is displayed on the display while driving of the microwave is stopped when the tray does not match the cooking type. Referring to the operation and effect of the present invention configured as described above in detail. First, when the ingredients to be cooked are put in the cooking chamber 10 of the microwave oven and the door is closed, the first and second door switches SW1 and SW2 are turned on and the monitor switch M-SW is turned off. If cooking is to be performed by a normal microwave, when the start button is pressed to start cooking, the start mill RY2 is turned on by the control of the controller on the control circuit board PCB, and the output is controlled by the controller. The high voltage transformer (HVT) is driven while the relay RY3 is controlled on / off at a cycle according to the output intensity selection to drive the magnetron to perform cooking by microwave, and as the start relay RY2 is turned on, the cavity is turned on. The lamp CL, the turntable motor GM and the fan motor FM are driven simultaneously. In the case of convection cooking, the start relay RY2, the convection motor relay RY1, and the heater relay RY4 are turned on to control the convection cooking. In the case of the convection cooking, the start relay RY2 and the heater relay RY4 are controlled. As the) is turned on, the cavity lamp CL is turned on, the turntable motor GM and the fan motor FM are driven, and the heater H is turned on to start heating. Subsequently, the inside temperature of the cooking chamber 10 is sensed through a temperature sensor, and the detected temperature is compared with a predetermined temperature (for example, 80 ° C.) or more, and then a constant temperature (for example, 80 ° C.) is compared. The convection motor relay RY1 remains turned off until it is reached. Subsequently, when the internal temperature is higher than a predetermined temperature (for example, 80 ° C.), the convection motor relay RY1 is turned on to drive the convection motor CM so that the initial temperature of the high temperature can be rapidly increased during the initial heating. When the CM) is turned off and rises above a certain temperature (for example, 80 ° C.), the convection motor CM is turned on so that hot air is circulated in the refrigerator. In addition, the conventional convection cooking control according to the temperature detection until the end of the cooking time, but also controls to increase the thermal efficiency by intermittently turning on / off the convection motor (CM). That is, when the convection heater is installed, the heat of the convection heater is circulated to the inside of the convection fan when the convection fan is operated.However, in the microwave oven in which the convection heater is removed, only the main heater (H) in the oven is operated. As a result, the heat loss is increased. Therefore, in the early stage of heating, the temperature in the refrigerator is raised to a desired constant temperature (for example, 80 ° C) within a short time without operating the convection fan until the temperature is raised to a constant temperature (for example, 80 ° C), and the constant temperature ( For example, it is possible to shorten the cooking time and to achieve the original convection cooking effect by turning off the convection pan intermittently after being raised to 80 ° C.) to improve thermal efficiency. Thereafter, when the cooking time ends, the start relay RY2 and the heater relay RY4 are turned off, and the convection motor relay RY1 continues to be turned on. The tray used in the multi-functional microwave oven includes a glass tray 1 used in the microwave function and an enamel tray 5 used in the heater function, so that the type of tray is selected and used according to the cooking function. Therefore, if the consumer wants to use the microwave function, as shown in FIG. 2, after inserting the glass tray 1 on the roller guide 2 coupled with the hub 4, the glass tray 1 When the microwave oven is placed on the material to be cooked, the wheel 3 attached to the roller guide 2 rotates past the first weight sensor WS1 installed on the bottom surface 15 of the cooking chamber 10. The microwave function operates continuously as it goes. However, when the consumer tries to cook by microwave using the microwave function as described above, if the enamel tray 5 is incorrectly inserted without using the glass tray 1, the second weight sensor WS1 is used. By passing the second weight sensor WS2 installed on the bottom surface 15 of the cooking chamber 10 while the wheel 6 attached to the enamel tray 5 is not rotated by the microwave function. Accordingly, by detecting a tray insertion failure in the control circuit board PCB, the rotation of the tray is automatically stopped, and a display for guiding the replacement to the glass trench 1 through the function display window of the operation panel is displayed. On the other hand, if the consumer wants to use the heater function, as shown in FIG. 3, after inserting the enamel tray 5 to be combined with the hub 7, the material to be cooked on the enamel tray 5 is prepared. When the microwave oven is placed and operated, the heater 6 functions as the wheel 6 attached to the enamel tray 5 rotates and passes over the second weight sensor WS2 installed on the bottom 15 of the cooking chamber 10. This is operated continuously. However, when the consumer tries to cook using the heater function as described above, if the glass tray 1 is inserted incorrectly without using the enamel tray 5, the first weight sensor WS2 may cause the electronic Control circuit board as the range function does not operate continuously and the wheel 3 attached to the glass tray 1 rotates and passes over the first weight sensor WS1 installed on the bottom surface 15 of the cooking chamber 10. By detecting the tray insertion failure in the PCB, the tray rotation is automatically stopped, and a display for guiding replacement to the enamel tray 5 is displayed through the function display window of the operation panel. In addition, when using the glass tray 1 when the microwave function is thawed, the microwave function is normally operated by driving of the first weight sensor WS1, but the glass tray is controlled through the first ditch detection sensor WS1. (1) detecting the above thawing weight, comparing the detected thawing weight with a predetermined weight (for example, 2 kg) or more, and if the predetermined thawing weight is not less than a predetermined weight (for example, 2 kg), the control circuit board ( By detecting the tray insertion failure due to overweight on the PCB), the tray rotation is automatically stopped and the overweight error is displayed through the function display window of the operation panel. When the operation is shown in a flow chart as shown in FIG. 4, a first step (S1) of turning on the start relay when the cooking of the microwave function starts and controlling the on / off of the output control relay; A second step S2 of determining whether the first weight sensor is operated; A third step (S3) of determining whether the second weight sensor is operated when the first weight sensor is not operated; A fourth step (S4) of turning off the start relay and the output control relay after displaying an error because the tray is not inserted into a tray in which the tray is not inserted when the second weight sensor is not operated; When the second weight sensor is operated in the step S3, after displaying the error for the tray which is misinserted due to a tray type insertion failure in which the tray type is incorrectly inserted, the start relay and the output control relay are turned on. A fifth step (S5) of turning off: a sixth step (S6) of determining whether the weight is less than a set weight (for example, 2 kg) when the first weight sensor is operated in the step (S2); A seventh step (S7) of turning off the start relay and the output control relay after displaying the overweight error because the weight is exceeded if the weight is not less than the set weight (for example, 2 kg) during thawing; An eighth step (S8) of determining whether the internal temperature of the refrigerator is less than the set temperature (eg 80 ° C.) when the weight at thawing in the step (S6) is less than the set weight (eg 2 kg); If the internal temperature is not lower than the set temperature (for example, 80 ° C.), the internal temperature is overheated, so that the internal temperature transient rise error is displayed, and the ninth step (S9) of turning off the start relay and the output control relay; A tenth step (S10) of determining whether rotation of the tray is periodically detected when the internal temperature of the refrigerator in the step (S8) is lower than a preset temperature (for example, 80 ° C); An eleventh step (S11) of turning off the start relay and the output control relay after displaying the tray rotation failure error because the tray is not rotated normally when the rotation of the tray is not detected periodically; A twelfth step (S12) of determining whether the set cooking time is over when the rotation of the tray is periodically detected in the step (S10); When the set cooking time is over, the cooking is completed, and when the cooking time is not over, the process is sequentially performed in the thirteenth step S13 to continue cooking. As described in detail above, the present invention can induce normal use by informing the consumer when the microwave oven is not operated due to the immature use of the consumer, thereby preventing the malfunction of the product, thereby improving the performance of the product and It can improve the horizontal, there is an effect to improve the consumer's confidence in the product.

Claims (6)

The bottom 15 of the microwave cooking chamber 10 has a first weight sensor WS1 capable of sensing the weight of the glass tray 1 and a second weight sensing capable of sensing the weight of the enamel tray 5. A sensor (WS2) is installed at predetermined intervals, the operation of the microwave oven control device, characterized in that the misuse of the tray is displayed on the display while the drive of the microwave is stopped when using the tray does not match the type of cooking. The display apparatus of claim 1, wherein when the first weight sensor WS1 detects that the weight of the thawed food placed on the glass tray 1 exceeds a set weight, the microwave is stopped and the display indicates that it is a misuse. Microwave malfunction control device characterized in that. The method according to claim 1, wherein after the cooking of the heater is detected by the second weight sensor (WS2) as the enamel tray (5), when the temperature of the cooking chamber (10) detected by the temperature sensor is higher than or equal to the set temperature, the display is misused. Microwave malfunction control device characterized in that the display is stopped while driving the microwave to prevent continuous use. The method according to claim 1, 2, or 3, wherein even if a tray suitable for cooking selection is used, when the tray is not seated normally and the rotation of the microwave is stopped, the display of misuse is displayed on the display. Microwave malfunction control device. 4. The malfunction control apparatus for a microwave oven according to claim 1, 2, or 3, wherein the display is lit or flashed to be a misuse indication. Turning on the start relay when the cooking of the microwave function is started, and controlling the on / off of the output control relay (S1); A second step S2 of determining whether the first weight sensor is operated; A third step (S3) of determining whether the second weight sensor is operated when the first weight sensor is not operated; A fourth step (S4) of turning off the start relay and the output control relay after displaying an error because the tray is not inserted into a tray in which the tray is not inserted when the second weight sensor is not operated; When the second weight sensor is operated in the step S3, after displaying the error for the tray which is misinserted due to a tray type insertion failure in which the tray type is incorrectly inserted, the start relay and the output control relay are turned on. A fifth step S5 of turning off; A sixth step (S6) of determining whether the weight is less than the set weight when the first weight sensor is operated in the step (S2); A seventh step (S7) of turning off the start relay and the output control relay after displaying the overweight error because the weight is exceeded when the weight is not less than the set weight during the thawing, that is, the weight is over the set weight; An eighth step (S8) of determining whether the internal temperature is less than the set temperature when the weight at the time of thawing in the step (S6) is less than the set weight; If the internal temperature is not less than the set temperature, that is, if the internal temperature is overheated because the internal temperature is overheated, and displaying the high temperature transient rise error, a ninth step (S9) of turning off the start relay and the output control relay; A tenth step (S10) of determining whether rotation of the tray is periodically detected when the internal temperature of the refrigerator is lower than the set temperature in the step (S8); An eleventh step (S11) of turning off the start relay and the output control relay after displaying a tray rotation error error because the tray is not rotated normally when the rotation of the tray is not detected periodically; A twelfth step (S12) of determining whether the set cooking time is over when the rotation of the tray is periodically detected in the step (S10); When the set cooking time is over, the cooking is completed, and if the cooking time is not finished, the operation of the microwave control method, characterized in that the sequential operation in step 13 (S13) to continue to proceed.