KR20110129720A - A cooking apparatus using microwave and method for operating the same - Google Patents

Abstract

PURPOSE: The resonance mode transform unit is activated. In that way only the scan duration does not repeat continuously. The heating zone can operate, a heating efficiently can operate. CONSTITUTION: A cooker using a microwave comprises a microwave generating unit, a oscillating mode changing unit, and a controller. It is created a plurality of microwaves for heating the object of the cavity inside and the microwave generating unit outputs(S410). The resonance mode transform unit at least varies one within cavity among the progressive direction of the outputted microwave, and the power and the frequency, the resonance mode is changed(S430). According to the microwave which the controller is reflected to among the outputted microwave from the cavity inside, the number of frequency of microwave more than the standards efficiency is less than the standard value based on the heating efficiency, it controls so that the resonance mode transform unit act(S435).

Description

A cooking apparatus using microwave and method for operating the same}

The present invention relates to a cooking apparatus using a microwave and an operation method thereof, and more particularly, to a cooking apparatus using a microwave and an operation method thereof that can improve the operation efficiency.

In general, when a microwave oven uses a microwave oven to store food and seals the food, and then presses an operation button, a voltage is applied to the high pressure generator, and a commercial voltage applied to the high pressure generator is boosted to apply power to the magnetron that generates the microwave. The microwave generated by the magnetron is transmitted to the cavity through a wave guide or the like.

In this case, the cooking apparatus using the microwave is to heat the food with friction heat generated by irradiating the microwaves generated from the magnetron to the food and vibrating the molecules constituting the food 245 million times per second.

Cooking apparatus using such a microwave is a situation that is widely spread in the general home due to various advantages such as easy temperature control, saving of cooking time, ease of operation.

However, when cooking food using microwaves, there is a problem that a temperature difference occurs partially in the food without being uniformly heated by the surface deviation of the food. In addition, there is a problem that the temperature deviation during cooking also varies depending on the type of food stored in the cooking apparatus.

An object of the present invention is to provide a cooking apparatus using a microwave and an operation method thereof that can improve the operating efficiency of the microwave.

Microwave cooking apparatus according to an embodiment of the present invention for solving the above problems, the microwave generating unit for generating and outputting a plurality of microwaves for heating the object inside the cavity, and the micro output to the cavity On the basis of the heating efficiency calculated according to the resonant mode converter for varying at least one of the wave propagation direction, power, and frequency to change the resonant mode and the microwaves reflected from the inside of the cavity among the output microwaves, And a control unit for controlling the resonance mode converter to operate when the number of frequencies of microwaves with efficiency is lower than a reference value.

In addition, the operation method of the cooking appliance using the microwave according to the embodiment of the present invention for solving the above problems, generating a plurality of microwaves, outputting the generated microwaves into the cavity, And calculating a heating efficiency based on the microwaves reflected from the inside of the cavity, and converting the resonance mode in the cavity when the frequency number of the microwaves equal to or greater than the reference efficiency is less than the reference value based on the calculated heating efficiency.

According to an embodiment of the present invention, in the scan period, the heating efficiency is calculated based on the reflected microwaves, and based on the calculated heating efficiency, if the frequency number of the microwaves equal to or greater than the reference efficiency is less than the reference value, the resonance mode conversion unit Operate. As a result, the resonance mode in the cavity can be changed to efficiently enter the heating section. By operating the resonance mode converter, the heating section can be performed without continuously repeating only the scan section, so that the heating can be performed efficiently.

On the other hand, despite the operation of the resonance mode converter, the reference efficiency is lowered when the number of frequencies of microwaves having a reference efficiency or more is less than the reference value. By lowering the reference efficiency, the heating section can be performed without continuously repeating only the scan section, so that the heating can be performed efficiently.

On the other hand, when the heating section is performed and the scan section is performed again according to the down-referenced reference efficiency, based on the heating efficiency calculated for each microwave, the frequency number of the microwaves of the down-regulated reference efficiency or more is greater than or equal to the reference value If so, the reference efficiency is adjusted again. Accordingly, according to the reference efficiency adjusted downward, the same heating section is not repeated repeatedly, and uniform heating of the object can be performed.

1 is a partial perspective view of a cooking apparatus using a microwave according to an embodiment of the present invention.
2 is a cross-sectional view of the cooking appliance of FIG.
3 is a block diagram schematically illustrating the inside of the cooking appliance of FIG. 1.
4 is a flowchart illustrating a method of operating a cooking appliance using microwaves according to an embodiment of the present invention.
5 to 9 are views for explaining the operating method of the cooking appliance of FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The suffixes "module" and "unit" for components used in the following description are merely given in consideration of ease of preparation of the present specification, and do not impart any particular meaning or role by themselves. Therefore, the "module" and "unit" may be used interchangeably.

1 is a partial perspective view of a cooking appliance using a microwave according to an embodiment of the present invention, Figure 2 is a cross-sectional view of the cooking appliance of FIG.

Referring to the drawings, the cooking appliance 100 using the microwave according to an embodiment of the present invention, the door 106 is attached to the cooking window 104 in the front portion of the main body 102 is coupled to open and close. The operation panel 108 is coupled to one side of the front surface of the main body 102.

The door 106 opens and closes the cavity 134, and although not shown in the drawing, a door choke (not shown) for shielding microwaves may be disposed inside the door 106.

The operation panel 108 includes an operation unit 107 for operating the operation of the cooking appliance, and a display unit 105 for displaying the operation of the cooking appliance, and the like.

The inside of the main body 102 is provided with a cavity 134 having an accommodation space of a predetermined size so that the heating target 140, for example, food is accommodated and cooked by a microwave.

In addition, a microwave generating unit 110 for generating a microwave is installed on the outer surface of the cavity 134, and a microwave generated by the microwave generating unit 110 on the output side of the microwave generating unit 110. The microwave transmission unit 112 for guiding the inside of the cavity 134 is disposed.

The microwave generator 110 may include a magnetron or a solid state power amplifier (SSPA) using a semiconductor. Solid-state power amplifiers (SSPAs) have the advantage of taking up less space than magnetrons.

On the other hand, the solid state power amplifier (SSPA), a hybrid high-frequency integrated circuit (HMIC), or a passive element (passive and passive elements (capacitors and inductors, etc.) and active elements (transistors, etc.) are separately provided for amplification; The active device may be implemented as a single high frequency integrated circuit (MMIC) implemented as a single substrate.

Meanwhile, the microwave generator 110 may implement a solid state power amplifier (SSPA) as one module, which may be referred to as a solid state power module (SSPM).

Meanwhile, according to the exemplary embodiment of the present invention, the microwave generator 110 may generate and output a plurality of microwaves. The frequency range of such microwaves may be around 900 MHz to 2500 Hz. In particular, it may be within a predetermined range around 915 MHz or within a predetermined range around 2450 MHz. A detailed description of the microwave generator 110 will be described later with reference to FIG. 3.

The microwave transmitter 112 transmits the microwave generated and output by the microwave generator 110 to the cavity 134. The microwave transmitter 112 may include a waveguide or a coaxial line. In order to send the generated microwaves to the microwave transmitter 112, as shown in the figure, the feeder 142 may be connected.

On the other hand, the microwave transmission unit 112, as shown in the drawing can be implemented in the form of opening with the opening 145 into the cavity 134, but is not limited to this, it is also possible that the antenna (antenna) is coupled to the end Do. The opening 145 may be formed in various shapes such as a slot shape. Through the opening 145 or the antenna, the microwaves are emitted to the cavity 134.

Meanwhile, although one opening 145 is illustrated above the cavity 134 in the drawing, the opening 145 may be disposed below or on the side of the cavity 134, and a plurality of openings may be disposed. It is also possible. The same applies to the case where the coupling is performed through the antenna instead of the opening 145.

Below the microwave generator 110, a power supply 114 for supplying power to the microwave generator 110 is provided.

The power supply unit 114 may include a high voltage transformer for supplying power to the microwave generator 110 by boosting the power input to the cooking apparatus 100 to a high pressure, or generated by one or more switching elements performing a switching operation. An inverter for supplying a high output voltage of about 3500V or more to the microwave generator 110 may be provided.

Meanwhile, a cooling fan (not shown) for cooling the microwave generator 110 may be installed around the microwave generator 110.

Meanwhile, a resonance mode converter 155 may be installed in the cavity 134. The resonance mode converter 155 changes the resonance mode by varying at least one of the advancing direction, power, and frequency of the microwaves output into the cavity 134.

In the drawing, the resonance mode converter 155 is illustrated as being disposed near the opening 145, but is not limited thereto. Do.

Examples of the resonance mode converter 155 may include at least one of a stirrer, a rotation table, and a sliding table. Among them, the rotary table and the sliding table may be disposed under the cavity 134, and the stirrer may be disposed at various positions such as the lower, side, and upper portions of the cavity.

Hereinafter, the resonant mode converter 155 disclosed in the drawing will be described mainly with respect to the stirrer, and in particular, will be described with respect to the one disposed near the opening 145.

In the cooking apparatus 100 using the microwaves described above, the user opens the door 106, puts the heating object 140 into the cavity 134, and then closes the door 106, and then the operation panel 108. ), In particular, by pressing the cooking selection button (not shown) and the start button (not shown) by operating the operation unit 107, it is operated.

That is, the power supply unit 114 in the cooking apparatus 100 boosts the input AC power to a high-pressure DC power supply to supply the microwave generator 110, and the microwave generator 110 supplies the corresponding microwave. It generates and outputs, the microwave transmitter 112 transmits the generated microwave to be emitted to the cavity 134. Accordingly, the heating target 140, for example, the food inside the cavity 134 is heated.

3 is a block diagram schematically illustrating the inside of the cooking appliance of FIG. 1.

Referring to the drawings, the cooking apparatus 100 according to the embodiment of the present invention, the microwave generator 110, the microwave transmitter 112, the cavity 134, the resonance mode converter 155, The driving unit 157 and the control unit 310 may be included.

The microwave generator 110 includes a frequency oscillator 332, a level adjuster 334, an amplifier 336, a directional coupler 338, a first power detector 342, and a second power detector 346. ) May be included.

The frequency oscillator 332 oscillates to output a microwave of a corresponding frequency by a frequency control signal from the controller 310. The frequency oscillator 322 may include a voltage controlled oscillator (VCO). According to the voltage level of the frequency control signal, the voltage controlled oscillator VCO oscillates a corresponding frequency. For example, the greater the voltage level of the frequency control signal, the greater the frequency generated by oscillation in the voltage controlled oscillator VCO.

The level adjuster 334 may oscillate the frequency signal oscillated by the frequency oscillator 332 to output a microwave at a corresponding power according to the power control signal. The level adjuster 334 may include a voltage controlled attenuator (VCA).

According to the voltage level of the power control signal, the voltage control attenuation unit VCA performs a correction operation so that microwaves are output at a corresponding power. For example, the greater the voltage level of the power control signal, the greater the power level of the signal output from the voltage control attenuation unit VCA.

The amplifier 336 amplifies the oscillated frequency signal based on the frequency signal oscillated by the frequency oscillator 332 and the power control signal by the level adjuster 334 to output a microwave.

As described above, the amplifying unit 336 may include a solid state power amplifier (SSPA) using a semiconductor device, and in particular, may include a single high frequency integrated circuit (MMIC) using a single substrate. . As a result, the size thereof is reduced, and the integration of the device can be achieved.

Meanwhile, the frequency oscillator 332, the level adjuster 334, and the amplifier 336 described above may be implemented as one, which may be referred to as a solid state power oscillator (SSPO).

 The directional coupler (DC) 338 transmits the microwaves amplified by the amplifier 336 to the microwave transmitter 112. The microwave output from the microwave transmitter 112 heats an object in the cavity 134.

Meanwhile, microwaves that are not absorbed by the object in the cavity 134 and reflected may be input to the directional coupler 338 through the microwave transmitter 112. The directional coupler 338 transmits the reflected microwaves to the controller 310.

On the other hand, the first power detector 342 is disposed between the directional coupler 338 and the control unit 310, amplified by the amplifier 336 and outputted through the directional coupler 338 through the microwave transmission unit ( Detects the output power of the microwave delivered to 112. The detected power signal is input to the controller 310 to be used for calculating the heating efficiency. Meanwhile, the first power detector 342 may be implemented as a diode device for power detection.

Meanwhile, the second power detector 346 is disposed between the directional coupler 338 and the controller 310, and reflects the power of the reflected microwaves reflected from the cavity 134 and received by the directional coupler 338. Detect. The detected power signal is input to the controller 310 to be used for calculating the heating efficiency. Meanwhile, the second power detector 346 may be implemented as a diode device for power detection.

On the other hand, the microwave generator 110 is disposed between the amplifier 336 and the directional coupling unit 338, the microwave in the case of delivering the microwave amplified by the amplifier 336 to the cavity 134 Passing through, and the microwave reflected from the cavity 134 may further include an isolation (not shown) for blocking. Here, the isolation unit (not shown) may be implemented as an isolator.

The heating efficiency is calculated based on the microwaves reflected without being absorbed by the object among the microwaves emitted into the control unit 310 and the cavity 134.

Here, Pt represents the power of the microwave emitted into the cavity 134, Pr represents the power of the microwave reflected from the cavity 134, he represents the heating efficiency of the microwave.

According to Equation 1, the heating efficiency he becomes smaller as the power of the microwave to be reflected increases.

On the other hand, when a plurality of microwaves are emitted into the cavity 134, the control unit 310 calculates the heating efficiency (he) for each frequency of the plurality of microwaves. This heating efficiency calculation, according to an embodiment of the present invention, can be performed during the entire cooking period.

On the other hand, for efficient heating, the entire cooking section may be performed by dividing the scan section and the heating section. During the scan period, the plurality of microwaves may be sequentially output into the cavity 134 and the heating efficiency may be calculated based on the reflected microwaves. During the heating section, based on the heating efficiency calculated in the scan section, the microwaves are outputted with different output periods of the microwaves, or only microwaves of a predetermined frequency are output. On the other hand, the power of the microwave in the heating section is preferably significantly higher than the power of the microwave in the scan section.

The controller 310 generates and outputs a frequency control signal to vary the output period of the microwave depending on the calculated heating efficiency. The frequency oscillator 332 oscillates a corresponding frequency according to the input frequency control signal.

The controller 310 generates a frequency control signal to shorten the output period of the microwave when the calculated heating efficiency he is high. That is, while sequentially sweeping a plurality of microwaves, the output period of each microwave can be varied according to the calculated heating efficiency. In other words, the higher the heating efficiency he, the smaller the corresponding output period. Accordingly, the microwaves can be uniformly absorbed by the heating target 140 in the cavity 134 for each frequency, and the heating target 140 can be uniformly heated.

On the other hand, the control unit 310, it is also possible to control to output the microwave of the corresponding frequency only when the heating efficiency (he) calculated for each frequency is more than the set value. That is, the microwave of low frequency heating efficiency (he) is excluded from the actual heating period, it is possible to efficiently heat the heating target 140 uniformly.

Meanwhile, the directional coupler including the controller 310, the frequency control signal generator 310, the frequency oscillator 332, the level adjuster 334, and the amplifier 336 in the microwave generator 110 described above. 338, the first power detector 342, the second power detector 344, and the like may be implemented as one module. That is, it is possible to be all disposed on one substrate, to be implemented as one module.

The power supply unit 114 boosts the power input to the cooking appliance 100 to a high pressure and outputs the power to the microwave generator 110. The power supply unit 114 may be implemented as a high voltage transformer or an inverter.

On the other hand, the resonance mode converter 155 operates to change the resonance mode by varying at least one of the advancing direction, power, and frequency of the microwaves output into the cavity.

The resonance mode converter 155 is operated by the driving unit 157 under the control of the control unit 310. The drive unit 157 may include an electric motor (not shown) for driving a rotation operation or a reciprocating operation.

As described above, the resonance mode converter 155 may include at least one of a stirrer, a turn table, and a sliding table. Hereinafter, a description will be given of the stirrer.

The controller 310 controls the resonance mode converter 155 to operate when the number of frequencies of microwaves equal to or greater than the reference efficiency is less than the reference value, based on the heating efficiency calculated for each microwave in the scan period. For example, the stirrer 155 disposed near the opening 145 is rotated to operate at the first angle.

Thereafter, the scan section is performed again, and based on the heating efficiency calculated for each microwave, it is determined whether the number of frequencies of microwaves equal to or greater than the reference efficiency is less than the reference value. If less, the stirrer 155 is rotated to operate at a second angle greater than the first angle.

Based on the calculated heating efficiency calculated for each microwave after completion of the periodic operation of the stirrer 155, that is, one rotation operation, when the number of frequencies of microwaves equal to or greater than the reference efficiency is less than the reference value, the controller 310, Lower the reference efficiency. In other words, the number of frequencies of the microwaves with the lowered reference efficiency equal to or greater than the reference value. Accordingly, the heating section may be performed without continuously repeating only the scan section, and thus heating may be efficiently performed.

On the other hand, the control unit 310, according to the down-regulated reference efficiency, if the heating section is performed, and if the scan section is performed again, based on the heating efficiency calculated for each microwave, the microwave more than the down-regulated reference efficiency If the number of frequencies is equal to or greater than the reference value, the reference efficiency is adjusted again. Accordingly, according to the reference efficiency adjusted downward, the same heating section is not repeatedly repeated, and according to the change in the object, heating can be efficiently performed.

 Meanwhile, a block diagram of the cooking appliance 100 shown in FIG. 3 is a block diagram for one embodiment of the present invention. Each component of the block diagram may be integrated, added, or omitted according to the specifications of the cooking apparatus 100 that is actually implemented. That is, two or more constituent elements may be combined into one constituent element, or one constituent element may be constituted by two or more constituent elements, if necessary. In addition, the function performed in each block is for explaining an embodiment of the present invention, the specific operation or device does not limit the scope of the present invention.

4 is a flowchart illustrating a method of operating a cooking appliance using microwaves according to an embodiment of the present invention, and FIGS. 5 to 9 are views for explaining the method of operating the cooking appliance of FIG. 4.

Referring to the drawings, first, a plurality of microwaves are generated (S405). The microwave generator 110 may sequentially generate a plurality of microwaves having different frequencies.

Next, the generated microwaves are output into the cavity (S410), and the microwaves generated by the microwave generator 110 are output to the cavity 134 through the microwave transmitter 112. In this case, the plurality of microwaves may be sequentially output.

Next, the heating efficiency is calculated based on the microwaves reflected from the inside of the cavity (S415). The control unit 310 calculates the heating efficiency based on the power signal detected from the reflected microwaves received by the directional coupler 338, as shown in Equation 1 above. At this time, the output power signal of the microwave output to the cavity 134 may also be referred to.

Next, based on the calculated heating efficiency, it is determined whether the number of frequencies of the microwaves having the reference efficiency or more is less than the reference value (S420). If it is less than the reference value, it is determined whether the resonance mode conversion is performed (S425). If the resonance mode is not performed, the resonance mode in the cavity is converted (S430).

FIG. 6 (a) illustrates a heating efficiency curve S1 for each frequency of microwaves in a scan period. Referring to FIG. 6 (a), it can be seen that there is no frequency of microwaves having heating efficiency equal to or greater than the reference efficiency href. Accordingly, the heating section for heating only when the reference efficiency or more can not be performed.

In an embodiment of the present invention, to prevent this, a method of converting a resonance mode in the cavity 134 is provided. To this end, the resonance mode converter 155, which may vary at least one of the direction, power, and frequency of the microwave, is operated.

5 shows an example of the stirrer 155. The stirrer 155 can rotate about an axis. On the other hand, in the drawings, the disk form is illustrated, but not limited to this, various forms such as the propeller shape is possible. In addition, the stirrer 155 may be implemented with a metal member to change the resonance mode.

As described above, for example, as the stirrer 155 is rotated, the resonant mode can be changed by varying the advancing direction, power, and the like of the microwaves output inside the cavity.

For example, the stirrer 155 is rotated at a first angle of less than 360 degrees. Then, the above-described step 410 to step 420 (S410, S415, S420) is performed again.

That is, after rotating the stirrer 155 at a first angle, the microwave is output to the cavity, the heating efficiency is calculated according to the microwaves reflected from the inside of the cavity among the output microwaves, and based on the calculated heating efficiency Again, it is determined whether the number of frequencies of microwaves with a reference efficiency or more is less than the reference value.

FIG. 6 (b) illustrates the microwave heating efficiency curve S2 according to the operation of the stirrer 155 in the scan period. Referring to FIG. 6 (b), it can be seen that the heating efficiency curve is generally improved as compared with FIG. 6 (a) according to the operation of the stirrer 155.

In FIG. 6 (b), it can be confirmed that among the plurality of microwaves, microwaves having frequencies of f3, f4, f5, f8, f9, and f10 are equal to or greater than the reference efficiency and equal to or greater than the reference value (for example, three). Accordingly, in the heating section, the microwaves with the calculated frequencies of f3, f4, f5, f8, f9, and f10 are output at high power (S440), thereby enabling efficient heating.

FIG. 8 illustrates the operation of FIG. 6 converted to the entire cooking section.

The first scan section Ts1 calculates heating efficiency using n microwaves. As described above, in the first scan period Ts1, as shown in FIG. 6 (a), no microwaves having a frequency whose heating efficiency is greater than or equal to the reference efficiency may be absent. Accordingly, the resonance mode converter 155 such as a stirrer is operated and the second scan section Ts2 is performed.

 The second scan section Ts2 calculates the heating efficiency using n microwaves. As described above, according to the operation of the stirrer 155 in the second scan section Ts2, as shown in FIG.

Accordingly, in the heating section Th1, heating is performed based on the microwaves of the calculated frequencies f3, f4, f5, f8, f9 and f10. At this time, it may be divided into a first heating mode (mode1) and a second heating mode (mode2) according to the frequency concentration. The first heating mode mode1 indicates a mode of heating by using microwaves of the frequencies f3, f4, f5, and the second heating mode (mode2) is heating by using microwaves of the frequencies f8, f9, and f10. Can indicate a mode.

At this time, the higher the heating efficiency, the shorter the heating time. Thus, as illustrated in FIGS. 6 and 8, the heating time at the weighted high efficiency f4 frequency may be shortest, and at the lowest efficiency f3, f5, f8, f10 (i.e., the reference efficiency). The heating time can be set longest.

On the other hand, when the number of the frequency is less than the reference value in step 420 (S420), and if it is determined that the resonance mode conversion has already been performed (S420), the reference value is adjusted downward (S435).

Although the reference value downward adjustment may be performed immediately after performing one resonance mode conversion, it is preferable that the reference value is adjusted after completion of the periodic operation of the stirrer 155. That is, it is preferable that the stirrer 155 is performed when the one rotation operation is completed. Until one rotation, the output of the microwave and thus the heating efficiency calculation can be performed while rotating the stirrer 155 at a second angle or the like.

After the lowering of the reference value, the above-described output of the microwave and thus heating efficiency calculation may be performed. In operation S420, it is determined whether the number of frequencies of the microwaves with the reference efficiency lowered or lowered according to the reference value is adjusted lower than the reference value.

FIG. 7B illustrates a microwave heating efficiency curve S2 according to the operation of the stirrer 155 in the scan period. Referring to FIG. 7 (b), it can be seen that the heating efficiency curve is generally improved as compared with FIG. 7 (a) according to the operation of the stirrer 155. However, it can be seen that no number of microwaves is above the reference efficiency.

7 (c) shows that the reference efficiency is down-regulated compared to FIG. 7 (b), so that the number of microwaves with the down-regulated reference efficiency is greater than or equal to a predetermined value. That is, it can be confirmed that among the plurality of microwaves, microwaves having frequencies of f3, f4, f5, f8, f9, and f10 are equal to or greater than the reference efficiency and equal to or greater than the reference value (for example, three). Accordingly, in the heating section, the microwaves with the calculated frequencies of f3, f4, f5, f8, f9, and f10 are output at high power (S440), thereby enabling efficient heating.

FIG. 9 illustrates the operation of FIG. 7 converted to the entire cooking section.

The first scan section Ts1 calculates heating efficiency using n microwaves. As described above, in the first scan period Ts1, as shown in FIG. 7A, there may be no microwaves having frequencies whose heating efficiency is greater than or equal to the reference efficiency. Accordingly, the resonance mode converter 155 such as a stirrer is operated and the second scan section Ts2 is performed.

 The second scan section Ts2 calculates the heating efficiency using n microwaves. As described above, despite the operation of the stirrer 155 in the second scan period Ts2, as shown in FIG. 7B, there may be no microwaves having frequencies whose heating efficiency is greater than or equal to the reference efficiency. Accordingly, the reference efficiency is adjusted downward and the third scan period Ts3 is performed.

The third scan section Ts3 calculates heating efficiency by using n microwaves. As described above, in the third scan period Ts3, as shown in FIG. 7C, microwaves having a heating efficiency equal to or greater than the reference efficiency may be equal to or greater than the reference value according to the down-regulated reference efficiency.

Accordingly, in the heating section Th1, heating is performed based on the microwaves of the calculated frequencies f3, f4, f5, f8, f9 and f10. At this time, it may be divided into a first heating mode (mode1) and a second heating mode (mode2) according to the frequency concentration. The first heating mode mode1 indicates a mode of heating by using microwaves of the frequencies f3, f4, f5, and the second heating mode (mode2) is heating by using microwaves of the frequencies f8, f9, and f10. Can indicate a mode.

At this time, the higher the heating efficiency, the shorter the heating time. Thus, as illustrated in FIGS. 7 and 9, the heating time at the weighted high efficiency f4 frequency may be shortest, and at the frequency of the lowest efficiency f3, f5, f8, f10 (ie, reference efficiency). The heating time can be set longest.

On the other hand, when the scan interval is performed again after the reference value adjustment is lowered, when the frequency of the microwave frequency is greater than or equal to the reference value, the lowered reference efficiency may be adjusted upward. This is because performing the heating section on the original reference may be more suitable for uniform heating, etc., than to continue the heating on the lowered reference efficiency criterion.

Meanwhile, in operation S420, before performing the resonance mode conversion, when the frequency number of the microwaves having the reference efficiency or more is already greater than or equal to the reference value, the heating section may be performed using the microwaves of the corresponding frequency (S440). . At this time, the power of the microwave in the heating section may be greater than the power of the microwave in the scan section.

The cooking apparatus and the method of operating the microwave using the microwave according to the present invention is not limited to the configuration and method of the embodiments described as described above, the embodiments of the embodiments so that various modifications can be made All or part may be optionally combined.

On the other hand, the operating method of the cooking apparatus using the microwave of the present invention can be implemented as a processor-readable code in a processor-readable recording medium provided in the cooking apparatus. The processor-readable recording medium includes all kinds of recording devices that store data that can be read by the processor.

In addition, although the preferred embodiment of the present invention has been shown and described above, the present invention is not limited to the specific embodiments described above, but the technical field to which the invention belongs without departing from the spirit of the invention claimed in the claims. Of course, various modifications can be made by those skilled in the art, and these modifications should not be individually understood from the technical spirit or the prospect of the present invention.

110: microwave generator 112: microwave transmitter
134: cavity 155: resonance mode converter
310: control unit 338: directional coupling unit

Claims (15)

A microwave generator configured to generate and output a plurality of microwaves for heating an object in the cavity;
A resonance mode converter configured to change a resonance mode by varying at least one of a propagation direction, power, and frequency of the microwave output into the cavity; And
And a controller configured to control the resonance mode converter to operate when the number of frequencies of microwaves equal to or greater than a reference efficiency is less than a reference value based on a heating efficiency calculated according to microwaves reflected from the inside of the cavity among the output microwaves. Cooking apparatus using a microwave, characterized in that. The method of claim 1,
The control unit,
After the first operation of the resonance mode converter, based on the heating efficiency calculated according to the microwave reflected from the inside of the cavity of the output microwave, when the frequency of the microwave frequency of the reference efficiency or more is less than the reference value, the resonance Cooking apparatus using a microwave, characterized in that for controlling the mode conversion unit to operate a second. The method of claim 1,
The control unit,
After completion of the periodic operation of the resonance mode converter, the reference frequency when the frequency of the microwave of the microwave efficiency or more than the reference efficiency is less than the reference value based on the heating efficiency calculated according to the microwaves reflected from the inside of the cavity Microwave cooking apparatus characterized in that the efficiency is adjusted downward. The method of claim 3,
The control unit,
When the number of frequencies of the microwave above the reference efficiency is lower than the reference value, cooking apparatus using a microwave, characterized in that to control to perform a heating section using the microwave of the frequency. The method of claim 3,
The control unit,
On the basis of the calculated heating efficiency, when the frequency of the microwave frequency of the lowered reference efficiency or more is greater than the reference value, the cooker using a microwave, characterized in that for further adjusting the lowered reference efficiency again. The method of claim 1,
The resonance mode converter, at least one of a stirrer, a turn table, a sliding table cooking apparatus using a microwave, characterized in that. The method of claim 6,
The control unit,
When the resonance mode converter is the stirrer, the rotator is controlled to rotate,
And rotating the stirrer at a first angle, and calculating heating efficiency according to microwaves reflected from the inside of the cavity among the output microwaves. The method of claim 1,
And a microwave transmitter for transmitting a plurality of microwaves from the microwave generator into the cavity. The method of claim 1,
The microwave generator,
A frequency oscillator for oscillating a corresponding frequency according to an input frequency control signal; And
And an amplifier for amplifying the oscillated frequency signal and outputting a microwave for heating an object in the cavity. The method of claim 1,
And a directional coupler configured to transmit the microwaves output from the microwave generator into the cavity and to receive the microwaves reflected from the inside of the cavity. Generating a plurality of microwaves;
Outputting the generated microwaves into the cavity;
Calculating a heating efficiency based on the microwaves reflected from the inside of the cavity; And
And based on the calculated heating efficiency, converting a resonant mode in the cavity when the number of frequencies of microwaves equal to or greater than a reference efficiency is less than a reference value. The method of claim 11,
In the resonance mode conversion,
Method for operating a cooking appliance using a microwave, characterized in that for performing the output step, and the operation step again. The method of claim 11,
And adjusting the reference efficiency downward when the number of frequencies of microwaves equal to or greater than a reference efficiency is less than the reference value based on the calculated heating efficiency after performing the resonance mode conversion. How to cook. The method of claim 13,
After the downward adjustment step,
Based on the calculated heating efficiency, further adjusting the downlinked reference efficiency again when the number of frequencies of the microwaves above the lowered reference efficiency is greater than or equal to the reference value. The cooking apparatus using the microwave further comprising: How to operate. The method of claim 11,
And performing a heating section using microwaves of the corresponding frequencies when the number of frequencies of the microwaves equal to or greater than the reference efficiency is equal to or greater than the reference value.

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