KR0131952B1 - Tray insertion device of a microwave oven - Google Patents

Abstract

Install a weight detecting sensor(WS1) at the lower side of a microwave cooking room(10) on which wheels(2) of a tray(1) pass, to sense the weight of the tray(1). The tray(1) has different numbers of wheels as the sort of cooking changes. In case a tray is used, which does not fit with the sort of cooking, the operation of the microwave stops and the display shows the misuse of the tray. In case the weight sensor(WS1) senses the overweight of the food in a glass tray(1A), the operation of the microwave stops and shows misuse signal on the display.

Description

Microwave Tray Insertion Detection Device and Detection Method

1 is a driving circuit diagram of a microwave oven according to the present invention.

2 is a cross-sectional view showing the position of the tray and the weight sensor according to the present invention, (a) is an illustration of the glass tray (b) is an illustration of the enamel tray.

Figure 3 (a) and (b) is an exploded perspective view of the tray showing the attachment state of the wheel according to the invention, (a) is an illustration of the glass tray (b) is an illustration of the enamel tray.

4 is a flowchart of a tray misinsertion detection method of a 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: Weight Sensor

1: tray 2: wheels

3: hub 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 tray misuse prevention device and a prevention method. In general, a microwave oven is a multi-purpose bar that is equipped with a grill heater, a convection heater, and a convection fan in addition to a magnetron as a heating means. By rotating the convection fan installed at the rear of the convection heater while driving at the same time by the connection motor, the hot air is circulated inside the cooking chamber to cook 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 when the microwave oven is supplied with the user's manual attached to the sale, the consumer cannot fully understand the contents of the user's manual, and the product does not operate due to inexperienced use of the product even when the product is in normal use. 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 prevents the malfunction of the microwave oven generated when the tray is not selected according to the function selection by using the consumer without understanding the user manual. It is an object of the present invention to provide a tray misinsertion prevention device and a prevention method of a microwave oven. The present invention for achieving the object as described above, by installing a weight sensor on the bottom of the cooking chamber, the wheels attached to the tray three wheels on the glass tray and four wheels on the enamel tray, selection of the cooking method It is characterized in that the use of the tray according to the configuration is configured to be selected correctly. Hereinafter, with reference to the accompanying drawings, the present invention will be described in detail. In the microwave driving circuit according to the present invention, as shown in FIG. 1, one end of an input power source AC input through a line filter is connected to a magnetron thermostat MTH and a primary door switch SW1. It is connected to one end of the 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 stage of the low-voltage transformer (LVT) is connected to each power supply terminal such as a controller of a 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, and 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. 2 is a cross-sectional view showing the position of the tray and the weight sensor according to the present invention, as shown in this, the wheel (2) attached to the tray 1 is passed to the bottom surface 15 of the microwave cooking chamber 10 By installing a weight sensor (WS1) that can sense the weight in the position, by adjusting the number of wheels (2) attached to the tray 1, when the tray is not suitable for the type of cooking, the microwave oven stops driving Is configured to indicate misuse of the tray. That is, three wheels 2A, 2B and 2C are provided on the glass tray 1A of the microwave function as shown in FIG. 3A, and a third enamel tray 1B of the grill / convection function is provided on the glass tray 1A of the microwave function. As shown in (b) of FIG. 4, the four wheels 2a, 2b, 2c, and 2d are installed to detect the rotational speed of the wheels. It is configured to indicate misuse. 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 relay RY2 is turned on by the control of the controller on the control circuit board PCB, and the output control relay is controlled by the controller. The high-voltage transformer (HVT) is driven while 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 lamp CL, the turntable motor 9GM, 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 1 used in such a multi-functional microwave oven includes a glass tray 1A used in the microwave function and an enamel tray 1B used in the heater function. Will be used. Therefore, if the consumer wants to use the microwave function, as shown in FIG. 3 (a), the roller guide 4 having the three wheels 2A, 2B, and 2C attached thereto is coupled with the hub 3. After inserting the glass tray 1A on the roller guide 4, placing the material to be cooked on the glass tray 1A and operating the microwave oven, it is attached to the roller guide 4 for the glass tray 1A. As the three wheels 2A, 2B, and 2C rotate as they pass over the weight sensor WS1 installed on the bottom surface 15 of the cooking chamber 10, the wheels are controlled by the controller of the control circuit board PCB. The rotation speed of 2) is calculated, and the microwave function is continuously operated by the calculated rotation speed of the wheel 2. Here, if the rotational speed of the tray motor is set based on six revolutions per minute, one revolution per 10 seconds is performed, so that when the glass tray 1A is used, three wheels are provided on the roller guide 4 for the glass tray 1A. Since 2A, 2B, and 2C are provided, the number of revolutions of the wheel 2 has three revolutions per 10 seconds. However, when the consumer tries to cook by microwave using the microwave function as described above, if the enamel tray 1B is incorrectly inserted without using the glass tray 1A, the weight sensor WS1 is used. Since the number of revolutions of the wheels 2 detected through the rotation is not three revolutions per 10 seconds, the four wheels 2A, 2B, 2C, and 2D attached to the enamel tray 1B are not rotated by the microwave function. While detecting the tray insertion failure in the control circuit board (PCB) by the number of revolutions of the wheel (2) calculated as passing over the weight sensor (WS1) installed on the bottom surface 15 of the cooking chamber 10, The rotation of the tray is stopped, and a display for guiding replacement to the glass tray 1A is displayed through the function display window of the operation panel. On the other hand, if the consumer wants to use the heater function, as shown in (b) of FIG. 3, after inserting the enamel tray 1B to which the four wheels 2A, 2B, 2C, and 2D are attached, When the microwave oven is placed on the enamel tray 1B and the microwave oven is operated, four wheels 2A, 2B, 2C, and 2D attached to the enamel tray 1B rotate to rotate the bottom surface 15 of the cooking chamber 10. As it passes over the weight sensor WS1 installed in the controller, the rotation speed of the wheel 2 is calculated through the controller of the control circuit board PCB, and the microwave function is calculated by the calculated rotation speed of the wheel 2. This is operated continuously. Here, if the rotational speed of the tray motor is set based on six revolutions per minute, one revolution per 10 seconds is used, so that when the enamel tray 1B is used, four wheels 2A, 2B, and 2C are applied to the enamel tray 1B. , 2D) is installed so that the number of revolutions of the wheel 2 has a revolution of 4 revolutions per 10 seconds. However, when the consumer tries to cook using the heater function as described above, if the glass tray 1A is incorrectly inserted without using the enamel tray 1B, the wheel detected by the weight sensor WS1 is used. Since the number of revolutions of (2) is not four revolutions per 10 seconds, the heater function is not continuously operated, whereby the three wheels 2A, 2B, 2C, attached to the glass tray 1A are rotated, The tray rotation is automatically stopped by detecting a tray insertion failure in the control circuit board PCB by the number of revolutions of the wheel 2 calculated as it passes over the weight sensor WS1 installed on the bottom surface 15. And a display for guiding replacement by using the enamel tray 1B through the function display window of the operation panel. In addition, when the microwave function is thawed, when the glass tray 1A is used, the microwave function is normally operated by the rotation speed of the wheel 2 detected through the weight sensor WS1, but the weight sensor WS1 Detect the thawing weight on the glass tray 1A through), compare the detected thawing weight with a predetermined weight (for example, 2 kg) or more, and then determine the weight of the thawing weight over a predetermined weight (for example, 2 kg). By detecting a tray insertion failure due to the overweight on the control circuit board PCB, the rotation of the tray 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 Figure 4, the first step (S1) for controlling the on / off of the output control relay after turning on the start relay when cooking of the microwave function starts; A second step (S2) of determining whether the weight is detected through the weight sensor after turning on the start relay; A third step (S3) of turning off the start relay and the output control relay after displaying an error if the tray is not inserted into the tray when the weight is not detected through the weight detection sensor, and thus the tray is not inserted into the tray. A fourth step (S4) of determining whether the number of revolutions of the wheel attached to the roller guide is three revolutions for 10 seconds when the weight is sensed through the weight detection sensor in the step (S2); If the determined number of revolutions is not three revolutions in 10 seconds, the fifth error of turning off the start relay and the output control relay after displaying an error for the tray that is incorrectly inserted due to a tray type insertion failure. Step S5; A sixth step (S6) of determining whether the weight is less than a set weight (for example, 2 kg) during thawing when the rotation speed determined in the step S4 is three revolutions for 10 seconds; A seventh step (S7) of turning off the start relay and the output regulating relay after displaying the overweight error since the weight is exceeded when 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 finished, the cooking is completed, and when the cooking time is not finished, the process is sequentially performed in a 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 lifespan and improve the consumer's trust in the product.

Claims (7)

The bottom surface 15 of the microwave cooking chamber 10 is provided with a weight sensor WS1 capable of sensing a weight at a position at which the wheel 2 attached to the tray 1 passes, and the tray 1 is cooked. The tray trays of the microwave oven are provided with a plurality of trays having different numbers of wheels 2 according to the type, and the misuse of the trays is displayed on the display while the microwave oven is stopped when the tray is not suitable for the cooking type. Insertion detection device. The tray 1 is provided with three wheels 2A, 2B and 2C in the case of the glass tray 1A of the microwave oven function, and 4 in the case of the enamel tray 1B of the grill / convection function. By installing two wheels 2a, 2b, 2c, and 2d, the weight sensor WS1 detects the number of revolutions of the wheel passing by one rotation of the motor shaft, thereby stopping the driving of the microwave when the tray is not suitable for the type of cooking. Tray misinsertion detection device of the microwave oven, characterized in that the misuse of the tray on the display. The method of claim 2, wherein if the weight sensor WS1 detects that the weight of the thawed food placed on the glass tray 1A exceeds a set weight, the microwave oven is stopped and the display indicates that it is misused. The tray misinsertion detection apparatus of the microwave oven characterized by the above-mentioned. According to claim 2, wherein the enamel tray (1B) is detected by the number of revolutions of the four wheels (2a, 2b, 2c, 2d) to cook the heater, the temperature of the cooking chamber 10 detected by the temperature sensor is set The tray misinsertion detection device of the microwave oven, characterized in that to prevent the continuous use by stopping the operation of the microwave oven is displayed on the display to indicate that the misuse. According to claim 1, 2, 3, 4, even if the tray (1) for cooking selection is used, the operation of the microwave is stopped when the tray 1 is not rotated because it does not normally seat A tray misinsertion detection device for a microwave oven, characterized in that the display is misused. The tray misinsertion detection apparatus according to claim 1 or 2, 3 or 4, wherein the display is turned on or flashes when the display is misused. A first step (S1) of turning on the start relay when the cooking of the microwave function is started and controlling the on / off of the output control relay; A second step (S2) of determining whether the weight is detected through the weight sensor after turning on the start relay; A third step (S3) of turning off the start relay and the output control relay after displaying an error if the tray is not inserted into the tray when the weight is not detected through the weight detection sensor, and thus the tray is not inserted into the tray. A fourth step (S4) of determining whether the number of revolutions of the wheel attached to the roller guide is three revolutions for 10 seconds when the weight is sensed through the weight sensor in the step (S); If the determined number of revolutions is not three revolutions in 10 seconds, the fifth type of turning off the start relay and the output control relay after displaying an error for the tray that is incorrectly inserted due to a tray type misinsertion. Step S5; A sixth step (S6) of determining whether the weight is less than a set weight (for example, 2 kg) during thawing when the rotation speed determined in the step S4 is three revolutions for 10 seconds; 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 then the start relay and the output control relay are turned off (S9); 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 finished, the cooking is completed, and if the cooking time is not finished, the tray misinsertion detection method of the microwave oven, characterized in that the sequential operation in step 13 (S13) to continue the cooking.