KR20090003124U - Cooking apparatus - Google Patents

Abstract

The present invention relates to a cooking apparatus, and an object of the present invention is to provide a cooking apparatus capable of efficiently cooking food by varying the duty ratio of the heater according to the comparison result of the target temperature and the reference temperature.

To this end, the present invention performs a power supply mode for driving the heater to increase the cooking temperature and the cooking temperature to the target temperature inside the cooking chamber, and performs the power supply mode or the power-off mode when the cooking temperature reaches the target temperature. The controller may include a controller that periodically turns the heater on or off when the power supply mode is performed, and the controller compares the target temperature with the reference temperature and varies the duty ratio of the heater according to the comparison result.

Description

Cooking apparatus

The present invention relates to a cooking apparatus, and more particularly to a cooking apparatus having a grill heater that can cook food.

2. Description of the Related Art In general, microwaves generate microwaves by supplying electric current, and microwaves are irradiated to foods to heat foods. In the past, most microwave ovens use a single heat source method using only microwaves.

However, such a single heat source type microwave oven is insufficient to satisfy various cooking characteristics for various foods desired by the consumer, and thus, in recent years, microwave ovens in which other heat sources are built in the microwave are mainly used. Such heat sources include a convection heater for forcibly convection of hot air heated by a heater to heat the food inside the cooking chamber, and a grill heater for heating the food by radiating heat radiated from the heating wire radiated from the heated heater. .

The microwave oven with the grill heater is mounted inside the cooking compartment and the inside of the cooking compartment to accommodate the food, and the upper and lower grill heaters which radiate heat to the food by being located at the upper and lower portions of the cooking chamber respectively. And a microcomputer for turning on or off the upper and lower grill heaters. The temperature sensor periodically detects the temperature in the cooking chamber, and the microcomputer uses the temperature detected by the temperature sensor to determine whether the temperature in the cooking chamber is higher than the set temperature. If the temperature in the cooking chamber is higher than the set temperature, the heater is turned off. If is not higher than the set temperature, the heater is turned on or off at regular intervals to reach the current temperature.

However, the conventional microwave oven controls the internal temperature of the cooking chamber by turning the heater on or off in a state where the cycle is fixed, and controlled only by the cycle, not the influence of the temperature.

Therefore, when the temperature is high, the heater is turned off, and when the temperature is low, the heater is turned on or off at a predetermined cycle to control the microwave, and thus the cooking result of the food is not good, and there is a problem that it is difficult to make a countermeasure for improving it.

The present invention for achieving the above object performs a power supply mode for driving the heater to increase the cooking chamber temperature to the target temperature, and the heater is installed inside the cooking chamber, when the cooking chamber temperature is the target temperature A control unit configured to perform a power supply mode or a power cut-off mode and periodically turn on or off the heater when the power supply mode is performed, wherein the controller compares the target temperature with a reference temperature and compares the result with the comparison result. Accordingly, the duty ratio of the heater is varied.

Here, when the target temperature is lower than the reference temperature, the controller increases the duty ratio of the heater than the reference duty ratio.

The controller may reduce the duty ratio of the heater to the reference duty ratio when the target temperature is not lower than the reference temperature.

In addition, the heater includes an upper heater installed above the cooking chamber and a lower heater installed below the cooking chamber, and when the target temperature is not lower than the reference temperature, the duty ratio of the lower heater is reduced than the reference duty ratio. Let's do it.

Here, the reference temperature is characterized in that it is set differently according to the target temperature band.

As described above, according to the cooking apparatus of the present invention, the target temperature is compared with the reference temperature, and the duty ratio of the heater is controlled according to the comparison result, so that the cooking temperature is controlled by controlling the internal temperature of the cooking apparatus in an optimal state. Create the effect of cooking efficiently.

1 is a cross-sectional view showing the configuration of a microwave oven according to an embodiment of the present invention.

Referring to FIG. 1, a microwave oven according to an embodiment of the present invention includes a cooking chamber 11 for cooking food F inside a body 10 and a machine room 12 for embedding various electrical components. Compartment. The cooking chamber 11 has a front surface open to accommodate food F, and an open front surface is provided with a door (not shown) for opening and closing the cooking chamber 11, and food F inside the cooking chamber 11. ) Is mounted rotatably. In the machine room 12, a magnetron 14 for supplying a high frequency to the inside of the cooking chamber 11 and a high voltage transformer 15 for applying a high voltage to the magnetron 14 are installed. A cooling fan 16 is installed to cool the electrical parts inside the machine room 12.

In addition, an upper heater 17 for heating and cooking food F in the upper portion is installed in the upper portion of the cooking chamber 11 by using the high frequency supplied from the magnetron 14 to the cooking chamber 11. The lower heater 18 is installed in the lower portion of the cooking chamber 11 to heat and cook the food F from the lower portion. In addition, in the cooking chamber 11 of the microwave oven, the food F is supported in the space between the upper heater 17 and the lower heater 18 so that the upper and lower portions of the food F may be heated evenly. The shelf 19 is mounted.

In addition, the inside of the cooking chamber 11 is installed a temperature sensor 20 for measuring the temperature in the cooking chamber 11, the front of the machine room 12 selects the cooking function desired by the user and displays the selected cooking function and operation status An operation panel (not shown) for installing is provided.

2 is a control block diagram of a cooking apparatus according to an embodiment of the present invention, as shown in FIG. 2, the cooking apparatus includes a key input unit 110, a temperature sensor 20, a storage unit 120, and a controller ( 130, an upper heater driving unit 140, a lower heater driving unit 150, and a display unit 160.

The key input unit 110 includes a plurality of keys on the operation panel for inputting cooking information desired by the user (cooking time, target temperature, cooking menu, automatic cooking using a sensor, cooking start / stop, etc.) to the controller 130. Doing. Here, the target temperature refers to a temperature set by the user for cooking the food F, and may be input in units of 5 ° C. from 40 ° C. to 230 ° C. in general.

The temperature sensor 20 is installed at a portion of the wall of the cooking chamber 11 to sense a temperature in the cooking chamber 11.

The storage 120 stores and stores the reference temperature differently according to the band of the target temperature. For example, in a section where the target temperature is 100 ° C. to 140 ° C., the reference temperature is set to 120 ° C., and in the section where the target temperature is 150 ° C. to 200 ° C., the reference temperature is set to 180 ° C. and stored.

The control unit 130 is a microcomputer for controlling the devices of the microwave oven. When the user inputs a desired input value (cooking time, target temperature) from the key input unit 110 during cooking of the microwave oven, the upper heater 17 and the lower portion Perform the power supply mode to continuously drive the heater 18 to increase the cooking chamber 11 temperature to the target temperature, and when the cooking chamber 11 temperature rises to the target temperature, the cooking chamber 11 temperature is maintained to maintain the target temperature. Periodically execute the power supply mode or power shutdown mode.

As described above, the controller 130 performs a power supply mode or a power cut mode such that the cooking chamber 11 temperature maintains a target temperature. In this case, the control unit 130 periodically operates the upper heater 17 and the lower heater 18. Configured to be turned on or off.

In addition, the controller 130 compares the target temperature with the reference temperature, and varies the duty ratio of the upper heater 17 and the lower heater 18 according to the comparison result. Here, the duty ratio is a ratio indicating how much the upper heater 17 or the lower heater 18 is turned on in one cycle, and the reference temperature is a measure of the target temperature input by the user. It is preferable that the temperature is set in advance according to the band of the target temperature. For example, the target temperature may be set to 180 ° C in a section of 150 ° C ~ 200 ° C.

When the target temperature is lower than the reference temperature, the controller 130 increases the duty ratio of the upper heater 17 or the lower heater 18 than the reference duty ratio, and the controller 130 when the target temperature is not lower than the reference temperature. The duty ratio of the upper heater 17 or the lower heater 18 is reduced than the reference duty ratio.

The upper heater driving unit 140 controls the on or off operation of the upper heater 17 so that the upper heater 17 is heated according to the control signal of the controller 130, and the lower heater driving unit 150 of the controller 130 The on-off operation of the lower heater 18 is controlled to heat the lower heater 18 according to the control signal.

The display unit 160 displays a cooking time, a target temperature, a cooking menu, or an operation state of a microwave oven, etc. input by a user according to a control signal of the controller 130 on an operation panel (not shown).

Hereinafter will be described the operation process and the effect of the cooking apparatus configured as described above.

When power is applied and a cooking start signal is input, the temperature sensor 20 detects a temperature in the cooking chamber 11.

The detected temperature of the cooking chamber 11 is input to the controller 130, and the controller 130 controls the upper heater 17 and the lower heater 18 until the temperature of the cooking chamber 11 reaches a target temperature input by the user. Perform a power supply mode that continuously drives).

When the cooking chamber 11 temperature reaches the target temperature, the controller 130 periodically performs the power supply mode and the power cut-off mode. During the power supply mode, the controller 130 periodically operates the upper heater 17 and the lower heater 18. To turn it on or off.

In this case, the controller 130 compares the target temperature with the reference temperature, and varies the duty ratio of the upper heater 17 or the lower heater 18 according to the comparison result. More specifically, when the target temperature is lower than the reference temperature, the controller 130 increases the duty ratio of the upper heater 17 or the lower heater 18 than the reference duty ratio.

Referring to FIG. 3, when the target temperature input through the key input unit 110 in FIG. 3 is 150 ° C., the reference temperature is 160 ° C., and the reference duty ratio is 60%, the controller 130 may control the upper heater 17. And the lower heater 18 is periodically turned on or off for a predetermined time t1. At this time, since the target temperature is lower than the reference temperature, the lower heater 18 of the upper heater 17 and the lower heater 18 is turned on within a period (60 seconds). The upper heater 17 and the lower heater 18 are driven by setting approximately 83% so that the duty ratio increases from 60%, which is the reference duty ratio.

That is, the controller 130 turns on the upper heater 17 and the lower heater 18 for 50 seconds from the starting point, and turns off the upper heater 17 and the lower heater 18 for 10 seconds after the 50 seconds. Is repeated for a predetermined time t1.

4 is a timing diagram illustrating operations of upper and lower heaters according to a sensing result of a temperature sensor according to another embodiment of the present invention. Referring to FIG. 4, when the target temperature is not lower than the reference temperature. The duty ratio of at least one of the upper heater 17 and the lower heater 18 is reduced than the reference duty ratio.

For example, when the target temperature input through the key input unit 110 is 170 ° C. and the reference temperature is 160 ° C., the controller 130 adjusts the duty ratio of the lower heater 18 because the target temperature is not lower than the reference temperature. Reduced than the standard duty ratio. Therefore, the controller 130 turns on the lower heater 18 for 30 seconds from the start point and repeats the operation of turning off the lower heater 17 for 30 seconds after the predetermined time (t1).

As such, when the target temperature is lower than the reference temperature, the duty ratio of the heater is increased to be higher than the reference duty ratio, and when the target temperature is not lower than the reference temperature, the duty ratio of the heater is lower than the reference duty ratio to reduce the internal temperature of the cooking apparatus. To optimally control the food to be cooked efficiently.

1 is a cross-sectional view showing the configuration of a cooking apparatus according to an embodiment of the present invention.

2 is a control block diagram of a cooking apparatus according to an embodiment of the present invention.

Figure 3 is a timing diagram showing the operation of the upper and lower heaters according to the detection result of the temperature sensor according to an embodiment of the present invention.

Figure 4 is a timing diagram showing the operation of the upper and lower heaters according to the detection result of the temperature sensor according to another embodiment of the present invention.

* Description of symbols on the main parts of the drawings *

17.Top heater 18 ... Bottom heater

20 ... temperature sensor 110 ... key input

120 storage 130 control unit

140 Top heater drive 150 Bottom heater drive

160 ... Display

Claims (5)

A heater installed inside the cooking chamber; Performing a power supply mode for driving the heater to raise a cooking chamber temperature to a target temperature, and performing the power supply mode or a power cut mode when the cooking chamber temperature reaches the target temperature, and when the power supply mode is performed, A control unit for periodically turning on or off the heater, The control unit compares the target temperature and the reference temperature, and the cooking apparatus for varying the duty ratio of the heater according to the comparison result. The method of claim 1, wherein the control unit, And the duty ratio of the heater is greater than the reference duty ratio when the target temperature is lower than the reference temperature. The method of claim 1, wherein the control unit, And the duty ratio of the heater is lower than the reference duty ratio when the target temperature is not lower than the reference temperature. The method of claim 3, wherein The heater includes an upper heater installed above the cooking compartment, a lower heater installed below the cooking compartment, The control unit, And the duty ratio of the lower heater is lower than the reference duty ratio when the target temperature is not lower than the reference temperature. The method of claim 1, The reference temperature is set differently according to the target temperature band.

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