KR0176870B1 - Control method of refrigeration and keeping warm for microwave oven - Google Patents

Abstract

The present invention relates to a microwave / cold microwave oven and a method of controlling the same. In the related art, when the thermal insulation function of a cooked food in a microwave oven is performed by adjusting an on / off cycle of a magnetron, the cooked food is excessive in performing the thermal insulation function. It may be opened, there is a problem that the dryness or taste is dropped due to the change in the physical properties of the food, and also the heat retention function by the on / off cycle of the heater there is a problem that the surface may dry or burn.

Therefore, the present invention raises the temperature inside the heating chamber surrounded by the heat insulating layer using the principle of the thermoelectric element to enable the warming in the cooked state without changing the physical properties of the food and drying by heating storage, Stored in a refrigerator and stored in a refrigerator using a thermoelectric element in a microwave oven without the need for heating or heating again after moving to a microwave oven to perform the cooking function if necessary, and also if the cooked food is not eaten right away. It is more convenient to use the microwave oven as well as to use the microwave oven by storing it in the microwave and performing cooking function again when it is needed without having to move it back to the refrigerator.

Description

Cold / warm microwave oven and its control method

1 is a block diagram of a general microwave oven.

2 is a schematic diagram of a microwave oven of the present invention.

3 is a circuit diagram of FIG.

4 is a detailed configuration diagram of part A in FIG.

5 is a detailed configuration diagram of part B in FIG.

FIG. 6 is a diagram illustrating the operation principle of a thermoelectric device in FIG. 2, which performs a refrigerating function when power is supplied to the thermoelectric device in a forward direction.

FIG. 7 is a diagram illustrating an operation principle of a thermoelectric element in FIG. 2, which performs a warming function when power is supplied to the thermoelectric element in a reverse direction.

8 is a flowchart illustrating a control method of the microwave oven of the present invention.

* Explanation of symbols for main parts of the drawings

1: food 2: magnetron

3: waveguide 4: heating chamber

5: turntable 6: turntable motor

7: temperature sensor 8: circulation pin

9: upper heat exchanger 10: thermoelectric element

11: lower heat exchanger 12: cooling fan

13: heat insulation layer 14: cooling fan motor

15: heater 16: analog / digital conversion unit

17: microcomputer 18: key input unit

19: magnetron drive unit 20: forward / reverse power supply

30: thermoelectric module unit

The present invention relates to a microwave oven that can combine both a refrigeration function and a warming function, and in particular, by adding a cold / heating function that does not exist in a conventional microwave oven, as well as heating or warming the food, storing and cooking food. The present invention relates to a microwave / cold range microwave oven and a method of controlling the same, which expands the value of use of the microwave oven by allowing the thermal storage to be carried out.

A typical microwave oven has a turntable (5) capable of placing foods (1) in the heating chamber (4), as shown in FIG. 1, and rotating the turntable (5) at a constant rotational speed. A turntable motor 6 for providing a heat, a heater 15 for generating heat when the food is kept warm, a temperature sensor 7 for detecting a temperature of a heating chamber that changes as the food is cooked, and the temperature sensor 7 Analog / digital converter 16 for converting and outputting the temperature signal received through the digital data, and the temperature input and the key input from the key input unit 18 transmitted from the analog / digital converter 16 And a magnetron drive unit 19 for driving a magnetron 2 under the control of the microcomputer 17 so as to generate a high frequency into a heating chamber. In heating chamber (4) It consists of the waveguide (3) for guiding a.

Looking at the conventional technology configured as described above are as follows.

When the user places the food 1 on the turntable 5 located in the heating chamber 4 and presses the cooking function key through the key input unit 18, the microcomputer 17 recognizes this.

When the microcomputer 17 that recognizes the cooking function outputs a control signal for driving the magnetron to the magnetron driver 19, the magnetron driver 19 drives the magnetron 2 to generate high frequency.

When the waveguide 3 guides the high frequency generated in the magnetron 2 to the heating chamber 4, the high frequency is transmitted to the food 1 in the heating chamber 4 and starts to be heated. As 1) is heated, the temperature of the heating chamber 4 changes.

At this time, if the temperature sensor 7 transmits the temperature signal, which senses the temperature, to the analog (A) / digital (D) converter 16, the analog temperature signal is converted into digital data to the microcomputer 17. If so, the microcomputer 17 calculates the heating time and allows cooking for the calculated time.

And, if it is necessary to keep the food (1) insulated by operating a separate insulation key to properly control the on / off cycle of the magnetron 2 or to adjust the on / off cycle of the heater 15 to maintain the cooked food insulation function Perform.

However, in the prior art as described above, when the warming function of the cooked food in the microwave oven is performed by adjusting the on / off period of the magnetron, the cooked food may be excessively heated during the warming function, and the physical properties of the food. Due to the change, there is a problem that the taste dries or falls, and there is also a problem that the surface of the insulation function by the on / off cycle of the heater may dry or burn.

Accordingly, an object of the present invention is to provide a cold / heated atmosphere in which the atmosphere temperature inside the heating chamber surrounded by the heat insulation layer is kept in a cooked state without changing the physical properties of the food and drying by using the thermoelectric element. The present invention provides a microwave oven and a control method thereof.

Another object of the present invention is a microwave oven and a cold / cold combination that allows the cooking function to be re-stored in a microwave oven when the food is not eaten right away without having to move it to the refrigerator and store it again. To provide a control method.

In order to achieve the above object, a constitution of a combined cold / warm range includes a heating chamber surrounded by a heat insulating layer for heating food, and a circulation pin mounted thereon as shown in FIGS. 2 and 3. A turntable, a turntable motor for rotating the turntable, a waveguide for guiding the microwaves emitted by the magnetron into the heating chamber, magnetron driving means for controlling on / off of the magnetron according to a control output, and a lower portion of the turntable. And a thermoelectric module unit for warming or refrigerating the food in the heating chamber according to the direct / reverse DC power supply, and a forward / reverse power supply for supplying direct / reverse DC power to the thermoelectric module module. It consists of a supply means.

As shown in FIG. 4, the thermoelectric module unit includes a thermoelectric element that generates or absorbs heat when a constant DC voltage is applied in a forward or reverse direction, and is attached to upper and lower portions of the thermoelectric element to absorb or absorb heat. It consists of upper and lower heat exchanger to discharge.

And, the control method of the microwave oven according to the present invention, as shown in Figure 8, the function determination step of determining what function selected by the user, and if the function selected in the function determination step is a cooking function After the magnetron and the turntable are turned on, when the food temperature reaches the appropriate heating temperature, the cooking operation is terminated. When the refrigeration function is selected in the function determination step, the DC power is supplied to the thermoelectric element and the turntable is rotated to rotate the turntable. A cold storage step of dissipating heat to the outside, and a selection function performing step of switching to a cooking function if the cooking function is selected during the refrigerating function in the cold storage step and continuing to perform the refrigerating function if not selected; When selecting the heating function in the judgment step, supply reverse DC power to the thermoelectric element and rotate the turntable. It consists of a warm storage step of discharging and storing heat around the thermoelectric element into the heating chamber.

When described in detail with respect to the operation and effect of the present invention configured as described above.

Referring to the basic principle of the thermoelectric module unit 30 according to FIGS. 4 to 7 prior to the description, a constant direct current is applied to both ends of the thermoelectric element 10 located below the external turntable motor 6 of the heating chamber 4. When a voltage is applied, both sides of the element absorb or generate heat other than Joule heat.The endothermic heat is easily absorbed by attaching the upper heat exchanger 9 to the cross section that absorbs heat as shown in FIG. To serve as a negative, the heat generating section has a lower heat exchanger (11) to release the heat to the outside.

In addition, when the direction of the DC power source to be applied is changed, heat generation and absorption occur at opposite sides. That is, as shown in FIG. 7, the upper heat exchanger 9 serves as a heat radiating part and the lower heat exchanger 11 serves as a heat absorbing part.

Here, it is a top view when the thermoelectric module part 30 shown in FIG. 4 is seen from the turntable 5. As shown in FIG.

When the user places the food 1 to cook on the turntable 5 in the heating chamber 4 surrounded by the heat insulation layer 13 and selects the cooking function key of the key input unit 18, the microcomputer 17 recognizes First, a control signal is output to the magnetron driver 19.

Accordingly, the magnetron 2 is turned on by the magnetron driver 19 so that the microwaves are radiated into the heating chamber 4 through the waveguide 3 to be transmitted to the food 1, and the food table 1 is loaded with a turntable ( 5) is rotated by the turntable motor 6 to allow food to be cooked.

As the cooking proceeds, when the temperature sensor 7 indirectly senses the temperature of the food 1 and transmits it to the analog / digital conversion unit 16, the analog / digital conversion unit 16 responds to the analog temperature signal. When the digital signal is converted into a digital signal and output to the microcomputer 17, the microcomputer 17 recognizes the progress of cooking and the digital temperature signal input through the analog / digital conversion unit 16 is appropriately heated. When the magnetron is reached, the magnetron 2 and the turntable 5 are turned off and the cooking is finished.

If the user does not withdraw the cooked food 1 within a certain time after the end of cooking, the microcomputer 17 switches to a heat retaining function to prevent cooling, which is controlled by the forward / reverse power supply unit 20. As described above, the reverse direction DC power is supplied to the thermoelectric element 10.

The thermoelectric element 10 supplied with the reverse DC power supply performs an endothermic action. That is, the lower heat exchanger 11 serves as an endothermic portion that absorbs the surrounding heat, and the upper heat exchanger 9 acts as a heat radiating part for dissipating heat into the heating chamber 4, so that the temperature in the heating chamber 4 is reduced. To raise the warmth function.

At this time, the microcomputer 17 rotates the turntable 5 with the circulation pin 8 attached to the lower part so as to mix the air inside the heating chamber 4 to increase the warming effect.

If the user withdraws the food 1 while performing the warming function as described above, the driving of the thermoelectric element 10 and the turntable 5 is stopped and finished.

Next, when the refrigerating function of the food 1 is selected, the microcomputer 17 controls the forward / reverse power supply 20 to apply the direct current DC power to the thermoelectric element 10 as shown in FIG.

Accordingly, the thermoelectric element 10 performs a heat generating action. That is, the upper heat exchanger 9 serves as a heat absorbing part for absorbing heat inside the heating chamber 4, and the lower heat exchanger 11 serves as a heat radiating part for dissipating heat to the outside, thereby providing a temperature in the heating chamber 4. Drop it to perform the refrigeration function.

At this time, by rotating the turntable 5 equipped with the circulation pin 8, the air inside the heating chamber 4 is mixed to increase the refrigerating effect.

As described above, if the cooking function is selected again during the refrigerating function, the thermoelectric element 10 and the turntable 5 are turned off to perform the cooking function.

Referring to the operation as described above based on the operation flowchart shown in FIG. 8, first, it is checked whether the function selected by the user is a cooking function, a refrigeration function, or a warming function. After turning on the turntable 5 to heat the food, it detects the temperature at the time of heating the food, checks whether the proper heating temperature is reached, and when it arrives, turns off the magnetron 2 and the turntable 5 to finish cooking.

Next, if the refrigerating function is selected, the DC power supply is applied to the thermoelectric element 10 in the forward direction to absorb heat inside the heating chamber 4 and release the heat to the outside. 5) Turn on and rotate to mix air in the heating chamber (4) to increase the refrigeration effect.

If the cooking function is selected during the refrigerating function as described above, the power supply to the thermoelectric element 10 is turned off, and the turntable 5 is turned off, and then the magnetron 2 and the turntable 5 are turned off as in the operation. If the cooking function is not selected while the refrigeration function is being run, the thermoelectric element 10 and the turntable 5 are turned off when the refrigeration temperature is reached. Continue to 10) to supply DC power in the forward direction.

Finally, when the warming function is selected, the DC power is supplied in the reverse direction to the thermoelectric element 10 so that the surrounding heat is released into the heating chamber 4 so that the temperature is raised to perform the warming function, and the circulation at the bottom is performed. By rotating the turntable 5 equipped with the fins 8, the air inside the heating chamber 4 is mixed to increase the warming effect.

If the food 1 is not withdrawn for a certain time after the completion of the cooking function or the cooking function is performed, the heating function is continuously performed. If the food is withdrawn, the thermoelectric element 10 and the turntable 5 are turned off, and then all operations are terminated. .

As described in detail above, the present invention raises the temperature inside the heating chamber surrounded by the heat insulating layer using the principle of the thermoelectric element so that the food can be kept in a cooked state without changing the physical properties of the food and drying by heating. After refrigerated, stored in a separate refrigerator and then moved back to the microwave without heating or heating, it can be stored in a refrigerator using a thermoelectric element in a microwave oven, and then cooked if necessary. If you do not eat right away, you do not need to move back to the refrigerator to store it in the microwave just to keep the cooking function at the time required to provide convenience to the user.

Claims (5)

A heating chamber surrounded by an insulating layer for heating food, a turntable on which the food is loaded and a circulation pin, a turntable motor for rotating the turntable, a waveguide for guiding the microwaves emitted by the magnetron into the heating chamber; Magnetron driving means for controlling the on / off of the magnetron according to the jaer output, thermoelectric module unit located under the turntable to perform the heat insulation or refrigeration function for food in the heating chamber, and the thermoelectric module unit Combined cold / warm range microwave oven, characterized in that consisting of a forward / reverse power supply means for supplying a direct-current DC power supply. The thermoelectric module of claim 1, wherein the thermoelectric module module generates heat or an endothermic effect when a constant DC voltage is applied in a forward or reverse direction, and upper and lower heat exchangers attached to upper and lower portions of the thermoelectric element to absorb or release heat. Microwave oven for cold / hot, characterized in that consisting of. The microwave oven according to claim 1, wherein the circulation pin protrudes below the turntable to mix air in the heating chamber. A function determination step of determining what function is selected by the user; and if the function selected in the function determination step is a cooking function, a cooking execution step of ending cooking when the temperature of the food reaches an appropriate heating temperature after turning on the magnetron and the turntable; When the refrigeration function is selected in the function determination step, supplying a direct current DC power to the thermoelectric element and rotating the turntable to store the heat in the heating chamber to the outside to store, and the refrigeration function during the refrigeration function in the cold storage step If is selected, switch to cooking function, if not selected, performing the optional function to continue the refrigerating function, and when selecting the warming function in the function determination step, supply the reverse DC power to the thermoelectric element and rotate the turntable around the thermoelectric element It consists of a warm storage step to release and store heat into the heating chamber Cold / onjang control method of a combined microwave oven, characterized by. The method according to claim 4, further comprising: terminating the food when the food is taken out within a predetermined time after the end of cooking or during the heating function in the heating storage step, and continuing to perform the heating function if not withdrawn. A control method for a microwave oven for cold / warm use.