KR20020089969A - A heating time control method of toaster in microwave oven - Google Patents

Abstract

PURPOSE: A toaster sensor is installed in a toaster case, then a heating time for baking bread is controlled by preheating state of the toaster case to improve bread baking performance. CONSTITUTION: To control heating time of a toaster, temperature in a toaster case is detected using a temperature sensor. The detected temperature is compared with a safe temperature limit. If the temperature of the toaster case in within the safe temperature limit, a constant is added to the temperature of the toaster case to calculate heating time of the heater.

Description

A heating time control method of toaster in microwave oven

The present invention relates to a toaster combined use microwave oven, and more particularly, to a method for controlling the toaster heating time of a microwave oven.

In general, a toaster combined use microwave oven is a cooking apparatus that is equipped with a toaster in one microwave oven to easily bake not only various dishes according to the function of the microwave but also bread.

The toaster combined use microwave oven includes a toaster heater in a microwave oven and bakes bread using heat from the toaster heater. That is, the user can be configured to bake bread using a toaster as well as various dishes using a microwave oven. Therefore, the user can easily bake without having a separate toaster.

It will be described in detail with reference to the accompanying drawings for the conventional toaster combined microwave oven as described above.

1 is a block diagram showing a control unit of a conventional toaster combined microwave oven.

Inside the control unit of the conventional toaster combined microwave oven is provided with a microcomputer 1 for automatically calculating the data of each relay, and outputs the operation signal to each relay again. The microcomputer 1 is connected with relays for microwave operation and relays for toaster operation.

First, a main relay 2, a power relay 3, a door detection switch 4, and a microwave operation key 5 necessary for microwave operation are connected to the microcomputer 1. The fan motor relay 6, the toaster heater relay 7, and the toaster operation key 8 necessary for the toaster operation are connected to the microcomputer 1.

First, in the microwave mode of the toaster combined microwave oven having the above configuration, the main relay 2 is connected to a magnetron (not shown) that generates microwave waves and input power applied from the outside. give. That is, when the main relay 2 is ON, the magnetron is operated to obtain heat required for microwave cooking.

The power relay 3 connects a high voltage transformer (not shown) for converting an input power supply and a home power supply into a high voltage required for the magnetron oscillation. That is, when the power relay 3 is ON, a high voltage transformer capable of driving the magnetron is operated.

In addition, the door detection switch 4 is a switch for controlling the operation of the microwave oven by detecting the opening and closing of the microwave oven door. That is, when the microwave oven door is opened, the door detection switch 4 disadvantages the power relay 3 and the main relay 2 so that the microwave oven is not operated even if the user selects the microwave operation.

Therefore, when the user presses the operation key 5 provided outside the microwave for cooking the microwave, the signal of the operation key 5 is input to the microcomputer 1. In response to the input signal, the microcomputer 1 operates the door detection switch 4 to determine whether the door of the microwave oven is open or closed. As a result of the determination, if the door is in the closed state, the microcomputer 1 turns on the main relay 2 and the power relay 3 to obtain the microwave waves required for microwave cooking at the magnetron.

However, if the door state detected by the door detection switch 4 is in the open state, the microcomputer 1 may turn off the main relay 2 and the power relay 3 to allow the user to cook the microwave. Control it so it doesn't.

Next, a description will be given of the toaster mode of the conventional microwave oven.

First, the toaster heater relay 7, the fan motor relay 6, and the toaster operation key 8 are connected to the microcomputer 1.

The toaster heater relay 7 connects an input power with a toaster heater that generates heat for baking bread. That is, when the toaster heater relay 7 is ON, the toaster heater receives power and generates heat to bake bread.

The pen motor relay 6 is connected to a fan motor that cools high heat generated from an input power source and a toaster heater. That is, when the fan motor relay 6 is ON, the high temperature generated by the toaster heater is driven by cooling the cooling fan.

Therefore, looking at the operation process in the toaster mode, the user puts the bread in the toaster and selects the toaster operation key 8 to bake the bread.

Thereafter, the toaster heater relay 7 is turned on according to the user's selection, and the toaster heater is operated to apply heat. The fan motor relay 6 is turned on to operate the fan motor to cool the heat of the toaster heater.

2 is a flowchart illustrating the operation of the microwave oven according to the related art.

The microwave toaster combined use will be described by dividing the operation in the microwave mode and the operation in the toaster mode.

First, in the microwave mode, the user puts food in the microwave for cooking food and closes the door. Then, the user selects the operation key 2 of the microwave oven desired (step 100).

When the microwave oven operation key 2 selected by the user is turned on, the main relay 2, the power relay 3, and the fan motor relay 6 connected to the microcomputer 1 of the microwave oven are turned on. (Step 110).

The relays are turned on to operate the high pressure transformer, and thus the magnetron is operated, and a cooling fan for cooling the high temperature of the magnetron is driven.

After the operation is performed, the microcomputer 1 determines whether the set time for cooking the microwave has elapsed (step 120).

If the set time has not elapsed, the main relay 2, the power relay 3 and the fan motor relay 6 continue to operate.

If the set time has elapsed, the main relay 2 and the power relay 3 are turned off (step 130). In other words, the high-voltage transformer and the magnetron stop to finish cooking in the microwave.

However, the fan motor relay 6 for cooling the heat generated in the magnetron continues to operate for a predetermined time.

After the main relay 2 and the power relay 3 are turned off, the fan motor relay 6 is turned off when a predetermined time elapses (step 140).

When the fan motor relay 6 is OFF, the operation of the fan motor is terminated, and thus, all operations in the microwave mode are completed at the same time as the fan motor is terminated.

Next, we will look at the toaster mode of the microwave oven.

First, the user puts bread in the toaster bread opening and selects the toaster operating key 8 to bake the bread (step 200).

When the toaster operation key 8 is turned on, the toaster heater relay 7 and the fan motor relay 6 are turned on (step 210).

The toaster heater relay 7 connects an input power with a toaster heater that generates heat for baking bread in the toaster. That is, when the toaster heater relay 7 is ON, the toaster heater receives power and generates heat.

In addition, the fan motor relay 6 drives a cooling fan for cooling the toaster when the toaster heater generates heat.

After the toaster heater relay 7 and the fan motor relay 6 are turned on, the microcomputer 1 determines whether the set time for toast cooking has elapsed (step 220).

If the set time has not elapsed, the toaster heater relay 7 and the fan motor relay 6 continue to be in an ON state. If the set time has elapsed, the toaster heater relay 7 is turned off and the toaster heater is stopped (step 230).

However, the fan motor relay 6 remains ON to drive the cooling fan for a preset time even after the toaster heater is stopped. Thereafter, when the predetermined time elapses, the fan motor relay 6 is turned off and all operations of the toaster mode are stopped (step 140).

Conventional toaster combined microwave oven as described above has a toaster in one microwave oven to bake bread, but has some problems as follows.

First, the degree of baking varies depending on the preheating state of the toaster heater during the repeated continuous operation of the toaster. That is, if a new baking operation is performed even before the toaster which has already been operated more than once is cooled, the baking setting time is added to the toaster that has not yet cooled, and overheating occurs in the toaster.

Therefore, the toaster of the overheat state commits a malfunction of burning bread, resulting in dissatisfaction of the user.

Second, if the toaster does not have sufficient cooling time, it may cause not only damage to the device but also fire.

Therefore, an object of the present invention is to provide a temperature sensing sensor in the toaster case, and to control the baking time according to the toaster case preheating state to always provide the same baking performance.

1 is a block diagram showing a control unit of a conventional toaster combined microwave oven.

Figure 2 is a flow chart of the operation of the conventional toaster microwave oven.

Figure 3 is a block diagram showing a control unit of the microwave oven toaster combined according to the present invention.

Figure 4 is a toaster heating time control flowchart of the toaster combined microwave oven according to the present invention.

<Description of Symbols for Major Parts of Drawings>

1,90: microcomputer 2,10: main relay

3,20: power relay 4,30: door detection switch

5,40: Microwave Oven Key 6,50: Fan Motor Relay

7,60: toaster heater relay 8,70: toaster operation key

80: temperature sensing sensor

Toaster heating time control method of a toaster combined microwave oven according to the present invention comprises the steps of: sensing the temperature of the toaster case in the toaster using a temperature sensor; Comparing the toaster case temperature sensed by the sensor and the safety temperature limit to which the toaster is operable: Automatically setting the heater heating time according to the result of the comparison.

Hereinafter, a toaster heating time control method of a toaster combined microwave oven according to the present invention will be described in detail with reference to the accompanying drawings.

Figure 3 is a block diagram showing a control unit of a toaster combined microwave oven according to the present invention.

The microcomputer is a device for controlling various devices required for cooking of a microwave oven, and in the present invention, controls the microwave oven and the toaster together.

The block diagram of the microwave control unit will be described by dividing into devices required for the microwave mode and devices required for the toaster mode.

First, in the microwave mode, the main relay 10, the power relay 20, the door detection switch 30, and the microwave operation key 40 are connected to the microcomputer 90.

The main relay 10 connects an input power source from the outside with a magnetron generating microwave waves. That is, when the main relay 10 is ON, the magnetron operates to obtain heat required for microwave cooking.

The power relay 20 connects a high voltage transformer that transforms an input power supply and a home power supply into a high voltage required for the magnetron oscillation. In other words, when the power relay 20 is ON, a high voltage transformer capable of driving the magnetron is operated.

In addition, the door detection switch 30 is a switch for controlling the operation of the microwave oven by detecting the opening and closing of the microwave oven door. That is, when the microwave oven door is opened, the door detection switch 30 disadvantages the power relay 10 and the main relay 20 so that the microwave oven is not operated even if the user selects the microwave operation.

Therefore, when the user presses the operation key 40 provided outside the microwave for cooking the microwave, the signal of the operation key 40 is input to the microcomputer 90. In response to the signal, the microcomputer 90 operates the door detection switch 30 to determine whether the door of the microwave oven is open or closed. When the determination value is the door closed state, the main relay 10 and the power relay 20 are turned on to obtain microwave waves required for microwave cooking in the magnetron.

However, if the door state detected by the door detection switch 30 is an open state, the microcomputer 90 may turn off the main relay 10 and the power relay 20 to allow the user to cook the microwave. Control it so it doesn't.

Next, the toaster mode of the toaster combined microwave oven according to the present invention will be described.

First, in the toaster mode, the toaster heater relay 60, the fan motor relay 50, the toaster case temperature sensing sensor 80, and the toaster operation key 70 are connected to the microcomputer 90.

The toaster heater relay 60 connects an input power with a toaster heater that generates heat for baking bread in the toaster. That is, when the toaster heater relay is ON, the toaster heater receives power and generates heat to bake bread.

The pen motor relay 50 is connected to a fan motor that cools high heat generated from an input power source and a toaster heater. That is, when the fan motor relay 50 is ON, the high temperature generated by the toaster heater is driven by cooling the cooling fan.

The toaster case temperature sensor 80 detects the temperature of the toaster case and inputs the detected temperature value to the microcomputer 90. The microcomputer 90 determines the temperature value detected by the temperature sensor 80 and automatically adjusts the toaster baking heating time according to the preheating state of the toaster case.

In addition, the temperature sensor 80 inputs the toaster case temperature to the microcomputer 90 even after the toaster heating ends, and rotates the cooling fan until the case temperature reaches a set safety temperature.

In addition, the temperature sensor 80 detects the temperature of the toaster case, and also has a function of blocking the risk of overheating or fire of the toaster case due to misuse such as no-load operation.

Therefore, when the user selects the toaster operation key 70 for baking bread, the operation signal is input to the microcomputer 90, and according to the input signal, the microcomputer 90 transmits the toaster heater relay 60 and the fan motor. Relay 50 and the temperature sensor 80 is turned on (ON). That is, the toaster heater and the fan motor operate according to the signal of the microcomputer 90, and the case temperature sensor 80 detects the temperature of the toaster case according to the operation of the fan motor.

4 is a flowchart illustrating a toaster heating time control of the microwave oven according to the present invention.

The microwave toaster combined use will be described by dividing the operation in the microwave mode and the operation in the toaster mode.

First, in the microwave mode, the user puts a load on the microwave oven to cook the microwave, closes the door, and then selects the microwave operation key 40 (step 300).

When the microwave oven operation key 40 is ON, the microcomputer 90 turns on the main relay 10, the power relay 20, and the fan motor relay 50 (Step 310). ).

As the main relay 10 and the power relay 20 are turned on, the magnetron is operated to obtain microwaves required for microwave cooking. As the fan motor relay 50 is turned on, the fan motor operates to cool the high temperature of the magnetron.

According to the operation, the microcomputer 90 determines whether the set time for cooking the microwave has elapsed (step 320). If the set time has not elapsed, the main relay 10, the power relay 20, and the fan motor relay 50 continue to operate.

If the set time has elapsed in step 320, the main relay 10 and the power relay 20 are turned off (step 330). In other words, the high-voltage transformer and magnetron stop to finish cooking.

On the other hand, the microcomputer 90 determines whether the heater relay 60 is in the ON state in the toaster mode described below (step 340).

That is, the microwave oven of the toaster of the present invention is configured to cool the heat generated in the toaster using a cooling fan of the microwave oven. Therefore, in order to stop the fan motor of the microwave oven, it is necessary to determine whether the heater relay 60 of the toaster is operated.

If the toaster heater relay 60 is in the OFF state in step 340, it is determined whether "K <N (° C)" is applied (step 350).

"K" represents the temperature of the toaster case sensed by the sensor 80.

"N" represents any temperature set to protect the surrounding components from the latent heat of the toaster case.

That is, the microcomputer 90 determines whether the temperature of the toaster case sensed by the sensor 80 is smaller than a predetermined temperature set to protect the surrounding components from the latent heat of the toaster case.

If the "K" value is larger than the "N" value, the microcomputer continues to operate the cooling fan until the "K" value is smaller than the "N" value.

However, when the "K" value is smaller than the "N" value, the fan motor relay 50 is turned off (step 360). That is, the fan motor relay 50 is turned off when the temperature of the toaster case falls below a predetermined temperature set to protect the component.

Therefore, when the fan motor relay 50 is turned off, the cooling fan no longer operates and all operations for the microwave oven are finished.

Meanwhile, if the heater relay 60 determined by the microcomputer 90 in the step 340 is ON, the microcomputer 90 determines whether the toaster heater relay 60 is operated in the toaster mode.

When the toaster heater relay 60 is in the operating state, the microcomputer 90 receives the case temperature detected by the sensor 80 every predetermined A second (operation 450).

At this time, if the temperature of the case sensed by the sensor 80 exceeds the limit temperature M to which the toaster can operate, the microcomputer 90 turns off the toaster heater relay 60 (operation 460).

When the toaster heater relay 60 is OFF, the toaster heater stops operating and heat required for toast is no longer applied. That is, the microcomputer 90 reads the temperature of the case detected by the sensor 80 every predetermined A seconds, and stops the toaster heater immediately after the case temperature exceeds the safety temperature limit M at which the toaster can operate. do.

If the value of "K" is smaller than the value of "M" in step 450, the microcomputer 90 determines whether the set time has elapsed again (step 470).

If the set time has not elapsed in step 470, the toaster heater and the fan motor continue to operate, and the microcomputer 90 checks the "K" value every A seconds.

If the set time has elapsed in step 470, the heater relay 60 is turned off (step 480) after the set time elapses. Therefore, the toaster heater stops operation by turning off the toaster heater relay 60.

When the toaster heater relay 60 is turned off and the toaster heater is stopped, the microcomputer 90 determines whether "K <N (° C)" is applied again (step 350).

That is, the microcomputer 90 determines whether the temperature of the toaster case sensed by the sensor 80 is smaller than a predetermined temperature set to protect the surrounding components from the latent heat of the toaster case.

If the "K" value is larger than the "N" value, the microcomputer 90 continues to operate the cooling fan until the "K" value is smaller than the "N" value.

However, when the "K" value is smaller than the "N" value, the fan motor relay 50 is turned off (step 360). That is, the fan motor relay 50 is turned off when the temperature of the toaster case falls below a predetermined temperature set to protect the component.

Therefore, when the fan motor relay 50 is turned off, the cooling fan no longer operates and all operations for the microwave oven and the toaster are finished.

The following describes the toaster mode of the flowchart according to the present invention.

First, the user puts bread in the toaster to bake the bread and then selects the toaster operating key 70 (operation 400).

When the toaster operation key 70 is turned on, the case temperature sensor 80 operates to transfer the detected case temperature value to the microcomputer 90. The microcomputer 90 checks the value of "K" (toaster case temperature) and determines whether the value of "K" is smaller than the value of "M" (safe temperature limit at which the toaster can operate) (step 410). .

If the value of "K" is greater than the value of "M" in step 410, the microcomputer 90 turns on the fan motor relay 50 (step 420).

When the fan motor relay 50 is ON, the fan motor is operated to cool the toaster until the value of "K" is smaller than the value of "M".

However, when the "K" value is smaller than the "M" value in step 410, the microcomputer 90 calculates the heater heating time (T) to drive the toaster (step 430).

The heater heating time calculation method of the microcomputer 90 is as follows.

T (sec) = K (° C) * A + α

※ T = Heater Heat Set Time (Toaster Heater Relay and Fan Motor Run Time).

K = temperature of the toaster case detected by the sensor.

A, α = constant.

The "T" (heater set time) is calculated by multiplying the value of "K" (toaster case temperature detected by the sensor) with an arbitrary constant. The constants A and α in the above formula are automatically adjusted by the microcomputer 90 according to the temperature K of the toaster case detected by the sensor.

When the heater heating set time T is calculated by the microcomputer 90, the toaster heater relay 60 and the fan motor relay 50 are turned on (step 440).

When the toaster heater relay 60 and the fan motor relay 50 are turned on in operation 440, the toaster heater and the cooling fan operate.

On the other hand, when the toaster heater relay 60 is ON, the microcomputer 90 checks whether the heater relay 60 is in an ON state in step 340 of the microwave mode. When the toaster heater relay 60 is in the operating state, the microcomputer 90 receives the case temperature detected by the sensor 80 every predetermined A second (operation 450).

At this time, if the temperature of the case sensed by the sensor 80 exceeds the limit temperature M to which the toaster can operate, the microcomputer 90 turns off the toaster heater relay 60 (operation 460).

When the toaster heater relay 60 is OFF, the toaster heater stops operating and heat required for toast is no longer applied. That is, the microcomputer 90 reads the temperature of the case detected by the sensor 80 every predetermined A seconds, and stops the toaster heater immediately after the case temperature exceeds the safety temperature limit M at which the toaster can operate. do.

Accordingly, step 460 may prevent fire due to excessive heat during toaster operation, and may also prevent damage to the device.

If the value of "K" is smaller than the value of "M" in step 450, the microcomputer 90 determines whether the set time has elapsed again (step 470).

If the set time has not elapsed in step 470, the toaster heater and the fan motor continue to operate, and the microcomputer 90 checks the "K" value every A seconds.

If the set time has elapsed in step 470, the heater relay 60 is turned off (step 480) after the set time elapses. Therefore, the toaster heater stops operation by turning off the toaster heater relay 60.

When the toaster heater relay 60 is turned off and the toaster heater is stopped, the microcomputer 90 determines whether "K <N (° C)" is applied again (step 350).

That is, the microcomputer 90 determines whether the temperature of the toaster case sensed by the sensor 80 is smaller than a predetermined temperature set to protect the surrounding components from the latent heat of the toaster case.

If the "K" value is larger than the "N" value, the microcomputer 90 continues to operate the cooling fan until the "K" value is smaller than the "N" value.

However, when the "K" value is smaller than the "N" value, the fan motor relay 50 is turned off (step 360). That is, the fan motor relay 50 is turned off when the temperature of the toaster case falls below a predetermined temperature set to protect the component.

Therefore, when the fan motor relay 50 is turned off, the cooling fan no longer operates and all operations for the toaster are completed.

Therefore, the present invention relates to a microwave oven with a toaster, which is provided with a case temperature sensor in the toaster case to sense the temperature of the case, and automatically adjusts the toaster baking time according to the preheating state of the case, which is always the same result. It is configured to achieve the baking function of the toast, and even after heating the toaster, the toaster operates only at a safe temperature at which the toaster can operate, thereby providing a safe air conditioning environment for the user.

In addition, by detecting the latent heat remaining in the case using the case temperature sensor, it prevents overheating of the toaster in advance, thereby preventing damage to the device, and in advance to block the risk of fire due to overheating. Have

Claims (5)

Sensing the temperature of the toaster case using a temperature sensor; Comparing the toaster case temperature sensed by the temperature sensing sensor with a safe temperature limit operable to toaster; In the comparing step, when the toaster case temperature is below the safe temperature limit to which the toaster can operate, adding a constant constant to the toaster case temperature to calculate a heater heating time. Time control method. The method of claim 1, And operating the toaster heater relay and the fan motor relay according to the calculated heater heating time. The method of claim 2, Checking the temperature of the toaster case every predetermined time during the operation of the toaster heater; Comparing the temperature of the toaster case and the safety temperature limit of the toaster operation, and controlling the operation of the toaster heater relay is performed only below the safety temperature limit of the toaster operation, toaster heating control method of the microwave oven toaster configured . The method according to claim 1, wherein Sensing a temperature of the toaster case after the set heater heating time ends; And controlling the fan motor relay to cool the latent heat of the toaster case according to the sensed temperature. The method of claim 4, wherein And controlling a fan motor relay for cooling the heat of the case according to the degree of overheating of the toaster case before the toaster heater operation.