KR20020096427A - A heating time control method of toaster in microwave oven - Google Patents

Abstract

PURPOSE: A method for controlling a heating time in a microwave oven having a function of a toaster is provided to toast constantly bread by checking a continuous operation time of a toaster and controlling automatically the heating time. CONSTITUTION: A user selects a toaster operation key(400). A micro computer compares a value of T with a setup time(410). A heater relay and a fan motor relay are turned on during a predetermined time of A if the value of T is more than the setup time(430). The micro computer compares the value of T with a value smaller than the setup value(420). The heater relay and the fan motor relay are turned on during a predetermined time of B if the value of T is more than the value smaller than the setup time(440). The heater relay and the fan motor relay are turned on during a predetermined time of C if the value of T is less than the value smaller than the setup time(450). The micro computer checks the setup time after the heater relay and the fan motor relay are turned on during the predetermined time(460). The heater relay is turned off if the setup time passes(470). The fan motor relay and the fan motor are turned off(480).

Description

A heating time control method of toaster in microwave oven

The present invention relates to a microwave oven for a toaster, 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 bread without 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 80 that automatically calculates the data of each relay, and outputs the operation signal back to each relay. The microcomputer 80 is connected with relays for microwave operation and relays for toaster operation.

First, the main relay 10, the power relay 20, the door detection switch 30, and the microwave operation key 40 required for the microwave operation are connected to the microcomputer 80. The fan motor relay 50, the toaster heater relay 60, and the toaster operation key 70 necessary for the toaster operation are connected to the microcomputer 80.

First, in the microwave mode of the toaster combined microwave oven having the above configuration, the main relay 10 is connected to a magnetron (not shown) that generates microwave (micro-wave) waves and input power applied from the outside. give. 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 (not shown) for converting 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 20 and the main relay 10 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 80. In response to the input signal, the microcomputer 80 operates the door detection switch 30 to determine whether the door of the microwave oven is open or closed. As a result of the determination, if the door is closed, the microcomputer 80 turns on the main relay 10 and the power relay 20 to obtain the microwave waves required for microwave cooking at the magnetron.

However, if the door state detected by the door detection switch 30 is an open state, the microcomputer 80 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, a description will be given of the toaster mode of the conventional microwave oven.

First, the toaster heater relay 60, the fan motor relay 50, and the toaster operation key 70 are connected to the microcomputer 80.

The toaster heater relay 60 connects an input power with a toaster heater that generates heat for baking bread. That is, when the toaster heater relay 60 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.

Therefore, looking at the operation process in the toaster mode, the user puts the bread in the toaster to bake the bread and selects the toaster operation key 70.

Thereafter, the toaster heater relay 60 is turned on according to a user's selection, and the toaster heater operates to apply heat. The fan motor relay 50 is turned on to operate the fan motor and 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. Thereafter, the user selects a desired operation key 40 of the microwave oven (step 100).

When the microwave oven operation key 40 selected by the user is turned on, the main relay 10, the power relay 20, and the fan motor relay 50 connected to the microcomputer 80 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 80 determines whether the set time for cooking the microwave has elapsed (step 120).

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 120, the main relay 10 and the power relay 20 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 50 for cooling the heat generated in the magnetron continues to operate for a predetermined time.

After the main relay 10 and the power relay 20 are turned off, the fan motor relay 50 is turned off when a predetermined time elapses (step 140).

When the fan motor relay 50 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 the bread in the toaster bread opening and selects the toaster operation key 70 to bake the bread (step 200).

When the toaster operation key 70 is turned on, the toaster heater relay 60 and the fan motor relay 50 are turned on (step 210).

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 60 is ON, the toaster heater receives power and generates heat.

In addition, the fan motor relay 50 drives a cooling fan to cool the toaster when the toaster heater generates heat.

After the toaster heater relay 60 and the fan motor relay 50 are turned on, the microcomputer 80 determines whether a set time for toast cooking has elapsed (step 220).

If the set time has not elapsed, the toaster heater relay 60 and the fan motor relay 50 continue to be in an ON state. If the set time has elapsed, the toaster heater relay 60 is turned off and the toaster heater is stopped (operation 230).

However, the fan motor relay 50 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 50 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.

Third, the baking time setting of the conventional toaster was a method of directly inputting the baking time appropriately by the user and the user's experience. In the same manner as described above, when the bread is continuously baked, the user needs to adjust and input the baking time repeatedly at each time, which causes the user to be dissatisfied.

It is therefore an object of the present invention to provide a method for controlling the toaster heating time of a microwave oven toaster such that the same time results in baking by checking the continuous operation time of the toaster and automatically adjusting the heating time in repeated use.

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 toaster heating time control flowchart of the toaster combined microwave oven according to the present invention.

<Description of Symbols for Major Parts of Drawings>

10: main relay 20: power relay

30: door detection switch 40: microwave oven operation key

50: fan motor relay 60: toaster heater relay

70: toaster operation key 80: microcomputer

Toaster heating time control method of the microwave oven toaster combined according to the present invention comprises the steps of counting the down time after the toaster heater relay off; Comparing the size of the down time for each predetermined time; And differentially setting an operation time of the toaster heater relay according to the comparison value.

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 flow chart of the toaster heating time control of the microwave oven toaster according to the present invention.

The toaster combined microwave oven will be described by dividing it into a microwave mode (MODE) and an operation method in the toaster mode (MODE). (Part numbers in the following drawings refer to conventional reference numerals.)

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

When the microwave oven operation key 40 is ON, the microcomputer 80 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 80 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 the magnetron stop to finish the microwave cooking.

On the other hand, the microcomputer 80 determines whether the heater relay is in an 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 by using the cooling fan of the microwave oven. Therefore, in order to stop the operation of the fan motor of the microwave oven, it is determined whether the heater relay 60 of the toaster is operated.

If it is determined in step 340 that the toaster heater relay 60 is in an OFF state, the microcomputer 80 may determine whether a predetermined time (N seconds) has elapsed after the heater relay 60 is turned off. (Step 350).

In step 350, the fan motor is further operated for a predetermined time (N seconds) even after the heater relay 60 is turned off. Therefore, if a predetermined time (N seconds) has elapsed after the heater relay 60 is turned off (OFF), the fan motor relay 50 is turned off (OFF) (step 360).

However, if the predetermined time (N seconds) has not elapsed in step 350, the fan motor relay 50 continues to be on for a predetermined time.

When the fan motor relay 50 is turned off in the 360 step, the fan motor is stopped and all operations of the microwave oven are terminated.

In operation 340, the microcomputer 80 determines whether the toaster heater relay 60 in the toaster mode described below is in an ON state.

That is, since the user can use the microwave oven and the toaster at the same time, if the user is using the toaster even after the operation of the microwave oven, the fan motor relay 50 should be kept ON.

Therefore, if the heater relay 60 in the toaster mode is ON in operation 340, the microcomputer 80 determines whether the operation setting time of the heater relay 60 has elapsed (operation 460).

If the set time has expired in step 460, the heater relay 60 is turned off (step 470). As the heater relay 60 is turned off, the operation of the toaster heater is stopped.

After operation 470, the microcomputer 80 determines whether a predetermined time (N seconds) has elapsed after the heater relay 60 is turned off (operation 480).

The step 470 is a step for removing latent heat remaining in the toaster heater by additionally operating the fan motor for a preset time after the heater relay 60 is turned off.

Therefore, when the predetermined time (N seconds) has elapsed, the fan motor relay 50 is turned off (step 480). And as the fan motor relay 50 is off, the operation of the fan motor is stopped.

When the fan motor relay 50 is turned off and the fan motor is stopped, all operations of the microwave oven and the toaster are completed.

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

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

When the toaster operation key 70 is turned on, the microcomputer 80 counts the time when the toaster heater relay is turned off and the time when the toaster heater relay is turned on again.

That is, the microcomputer 80 always stores the time when the toaster heater relay 60 was last turned off even after the toaster mode ends. Accordingly, when the user turns on the toaster operation key 70 again while the microcomputer 60 stores the last time when the toaster heater relay 60 is turned off, the microcomputer 60 newly starts the toaster from the stored time. The idle time until ON is counted.

In addition, the idle time counted by the microcomputer 80 (the elapsed time after the completion of the toaster heating) and the operating time of the heater relay 60 and the fan motor relay 50 preset in the microcomputer 80 are compared.

First, the microcomputer 80 determines whether the value of "T" (the time counted by the microcomputer after the heater relay off) is smaller than a predetermined predetermined time (120 seconds) (step 410).

As a result of the determination in step 410, when the "T" value is greater than a predetermined time (120 seconds), the heater relay 60 and the fan motor relay 50 are turned on for a predetermined "A second". (Step 430).

In one embodiment of the present invention, when the "T" value is 120 seconds or more, the operation setting time of the heater relay 60 and the fan motor relay 50 is illustrated as 2 minutes 30 seconds (A second). The operation time (2 minutes 30 seconds) represents the minimum time for the bread to be baked while the toaster is fully preheated.

When the value of "T" is smaller than the predetermined time (120 seconds) in step 410, the microcomputer 80 again sets the time when the value of "T" is set smaller than the predetermined time (60 seconds). It is determined whether or not less than (step 420).

If it is determined in step 420 that the value of "T" is smaller than 120 seconds and larger than 60 seconds, the heater relay 60 and the fan motor relay 50 are turned on for a predetermined "B second" ( Step 440).

In operation 440, the preset operating time of the heater relay 60 and the fan motor relay 50 is illustrated as 2 minutes. If the value of "T" is greater than 120 seconds, assuming that the operation setting time is "A second", the operation setting time of step 440 is to set a new "B second" by subtracting the unknown value α from A seconds. do. That is, the operation setting time of the toaster heater relay 60 and the fan motor relay 50 in step 440 is "B = A-α second".

Therefore, when the value of "T" is smaller than 120 seconds and larger than 60 seconds, the heater relay 60 and the fan motor relay 50 for a predetermined time, that is, two minutes (B seconds) preset in the microcomputer 80. Will be activated.

When the value of "T" is smaller than the preset time (60 seconds) in step 420, the heater relay 60 and the fan motor relay 50 are turned on for the preset "C seconds". (ON) (step 450).

The preset operating time of the heater relay 60 and the fan motor relay 50 in step 450 is illustrated as 1 minute 50 seconds (C seconds). The operation setting time (1 minute 50 seconds) represents a time obtained by subtracting a predetermined time by "β" from the time set to B seconds in step 440.

The operation time setting process of the toaster heater relay 60 and the fan motor relay 50 is performed as follows.

Set A sec = 2 min 30 sec.

B seconds = A-α (α = about 30 seconds) = 2 minutes

C seconds = A-α-β (β = about 10 seconds) = 1 minute 50 seconds.

The above steps are for the microcomputer 80 to store the idle time between the operation times of the toasters and to adjust the operation time of the toasters differently according to each idle time.

When the toaster heater relay 60 and the fan motor relay 50 operate for a predetermined time in each step, the microcomputer 80 determines whether the set time has elapsed again (step 460).

If the set time has elapsed in step 460, the heater relay 60 is turned off (step 470). As the heater relay 60 is turned off, the toaster heater stops operating and heat required for the toaster is no longer applied.

When the heater relay 60 is turned off in step 470, the fan motor is further operated for a predetermined time (N seconds). When the predetermined time elapses, the fan motor relay 50 is turned off and the fan motor is stopped (step 480). As the fan motor stops, all operation in toaster mode is terminated.

As described above, the present invention measures the preheating time of the toaster, and sets the toaster heating time differentially according to the preheating time, so that the user can always bake the same result.

Therefore, the present invention relates to a microwave oven for a toaster, and the microcomputer counts the time of using the toaster anew from the time of the last use of the toaster during continuous use of the toaster, and based on the counted time, the toaster heating time for each time difference. Differential adjustments have the effect of always giving the same baking results to the user.

In addition, it is possible to provide a safer and more convenient cooking environment to the user by adjusting the toaster heating time according to the toaster rest time.

Claims (2)

In a toaster combined microwave oven comprising a toaster heater for supplying heat for baking bread toaster and a toaster heater relay for connecting the toaster heater and a power source, Counting an idle time after the toaster heater relay is turned off; Comparing the size of the down time for each predetermined time; Toaster heating time control method of the microwave oven toaster configured to include the operation time of the next toaster heater relay in accordance with the comparison value configured. The method of claim 1, The setting of the operation time of the heater relay may include setting the operation time of the toaster heater relay to be long when the counted down time of the toaster heater relay is greater than or equal to the reference time, and setting the operation time of the toaster heater relay to be shorter than the reference time. Toaster heating time control method of a microwave oven toaster configured to include.