KR20180117906A - Microwave oven and method for controlling the same - Google Patents

Abstract

The present invention relates to a microwave oven and a control method thereof which can realize the same output with a product by compensating a performance deviation of a component through an output compensation algorithm. The microwave oven comprises: an inverter unit for switching a plurality of switching elements to provide power to drive a magnetron generating a microwave; a rectifying unit for converting alternating current power applied to the inverter unit to direct current power; and a compensation circuit unit for measuring the average value of the direct current power received from the rectifying unit based on reference power, and comparing a reference value corresponding to the reference power with the average value to determine a compensation value of a control signal controlling the plurality of switching elements.

Description

Microwave oven and method for controlling same [

The present invention relates to a control method of a microwave oven and a microwave oven, and more particularly, to a microwave oven and a microwave oven capable of realizing the same output of a product by performing compensation according to a performance deviation of a component through an output compensation algorithm. And a control method of the range.

≪ 2 > Generally, a microwave oven is a device for heating food by irradiating electromagnetic waves. The microwave oven is rapidly heated at the same time by the frictional heat generated between water molecules due to high frequency electromagnetic waves generated when a high voltage power is applied from the magnetron which is a high frequency oscillating tube and disturbing water molecules inside the food. Principle.

<3> FIG. 1 is a diagram showing the appearance of a conventional microwave oven. 2 is a block diagram showing a microwave oven including a conventional inverter.

When <4> 1 and 2, the microwave (M) is one of the devices using a high frequency as a cooking utensil using a dielectric heating method. The dielectric heating method is a method in which water molecules of water contained in the food are vibrated by heating the food into an oven and then the microwave is radiated. In contrast to a conventional heating cooking device heated from the surface of the food, Is heated first. For this purpose, a typical microwave oven uses a microwave whose wavelength is about 1/10 shorter than the TV wave.

<5> The heating source for generating the microwave is a special dipole tube called a magnetron (40), which concentrates the microwave on the food through the output antenna and heats it. An internal space through which the microwaves are resonated is referred to as a cavity 6, and the cavity 6 includes a turntable that rotates to uniformly heat food.

<6> In addition, the microwave (M) is shown a cooking command input section 1, a remaining time or the elapsed time according to the cooking command is input from the cooking instruction input section is formed on the exterior so that the user can input a cooking instruction And a door 3 for opening and closing the front surface of the cavity 6. [

In order to operate the magnetron 40, a commercial AC power source 220 of 220 V-60 Hz supplied to a household is converted into a high output DC voltage of about 3500 V or more through the inverter circuit device 100, 40).

<8> However, when making a plurality of microwaves, and each PCB is mounted on each of microwaves, may be present, the output error due to the components used, and thus the output of the microwave oven can vary. Each microwave oven can have different power consumption depending on the error of each component included in the PCB used in the microwave oven. Among them, AD (Analog to Digital) of the DC link terminal input to the micom, An error may occur depending on the dispersion of the output voltage of the regulator.

<9> In detail, the regulator to provide a reference voltage (ref_v) for measuring the value AD in the microcomputer, each of the regulator reference voltage (ref_v) provided in the microcomputer can cause a certain variation. Owing to the output deviation of each regulator, an output deviation of the microwave range of about 50 W per 0.1 V of the deviation of the reference voltage ref_v may occur. In other words, there has been a problem in that there is a variation in the output performance for each product to be shipped.

It is an object of the present invention to provide a control method of a microwave oven and a microwave oven which can realize the same output of a product by performing compensation through an output compensation algorithm in consideration of dispersion of an output voltage of a regulator.

It is to be understood that the objects of the present invention are not limited to the above-mentioned objects and other objects and advantages of the present invention which are not mentioned can be understood by the following description, Will be. Also, the objects and advantages of the invention will be readily appreciated that this can be realized by the means as claimed and combinations thereof.

According to an embodiment of the present invention, there is provided a microwave oven comprising: an inverter unit for providing a power source for magnetron driving for switching a plurality of switching elements to generate microwaves; an AC power source for applying a DC power to the inverter unit And a comparator for comparing the reference value corresponding to the reference power supply and the average value to calculate a compensation value of a control signal for controlling the plurality of switching elements, And a compensation circuit for determining a value.

According to another aspect of the present invention, there is provided a method of controlling a microwave oven, the method comprising: converting an AC power applied to an inverter unit for providing power for driving the magnetron to DC power; Measuring an average value of the DC power source and comparing the average value with a reference value corresponding to the reference power source to determine a compensation value of the control signal provided to the inverter unit.

<14> a control method of the microwave oven and the microwave oven according to the present invention, by considering the variation of the output voltage of the regulator performs the compensation by the compensation algorithm the output, can be equally implemented with the output of the product. As a result, the same performance is realized in the same product, so that the performance reliability of the product of the consumer can be increased and the satisfaction of the consumer can be increased. In addition, it is possible to reduce the consumer's claim and the return rate according to the output deviation of the product, thereby reducing the cost required for the AS of the product and lowering the defect rate of the product.

<15> Figure 1 shows the appearance of a conventional microwave oven.
<16> Figure 2 is a block diagram showing a microwave oven including a conventional inverter.
<17> Figure 3 is a block diagram showing a microwave oven in accordance with some embodiments of the invention.
<18> Figure 4 is a block diagram showing the components of the compensation circuit of Fig.
<19> Figure 5 is a view for explaining the AD value corresponding to the variation of the regulators included in the compensation circuit of Fig.
<20> Figure 6 is a view for explaining the operation of the compensation circuit of Fig.
<21> Figure 7 is a flow chart illustrating a control method of a microwave oven according to an embodiment of the present invention.
<22> Figure 8 is a flow chart illustrating a control method of a microwave oven according to another embodiment of the present invention.
<23> Figure 9 is a graph for explaining the effect of the microwave oven in accordance with some embodiments of the invention.

The terms and words used in the present specification and claims should not be construed to be limited to ordinary or dictionary meanings and the inventor may design the concept of the term appropriately in order to describe its own invention in the best way possible. It should be construed as meaning and concept consistent with the technical idea of the present invention. It should be noted that the embodiments described in the present specification and the configurations shown in the drawings are only the most preferred embodiments of the present invention and do not represent all the technical ideas of the present invention, It should be understood that various equivalents and modifications are possible.

<25> In the following, with reference to Figures 3-9, it will be described in detail with respect to the control method of the microwave oven and a microwave oven in accordance with some embodiments of the invention.

<26> Figure 3 is a block diagram showing a microwave oven in accordance with some embodiments of the invention.

If <27> Referring to Figure 3, a microwave oven in accordance with some embodiments of the invention comprises a commercial AC power source 10, the inverter circuit unit 100, and a magnetron (40).

The inverter circuit device 100 may include an inverter unit 20, a magnetron driving unit 30, a rectifying unit 50, a compensation circuit unit 200, and a switching frequency generating unit 60.

<29> In particular, the commercial AC power supply input through the 10 AC power supply is via a DC voltage part 22 consisting of a diode bridge can be input to the switching unit 24.

The switching unit 24 includes a plurality of switching elements. The switching unit 24 turns on / off a plurality of switching elements by a switching frequency generating unit 60 that generates an appropriate operating frequency in accordance with a heating load (food) or a current level change of the inputted commercial AC power, And may apply the generated power to the magnetron driving unit 30. [

The magnetron driving unit 30 converts the AC power applied from the switching unit 24 into a DC voltage of high output suitable for driving the magnetron 40 and can drive the magnetron 40 using the DC voltage. Accordingly, the magnetron 40 has an appropriate output value and can heat and cook the food.

The switching frequency generator 60 for determining the frequency of the switching operation of the switching unit 24 is controlled by the compensation circuit unit 200. The compensation circuit unit 200 compares the cooking instruction The type of food, and the like), and the control signal corresponding to the current level variation of the AC power input from the commercial AC power supply unit 10 to control the switching frequency generator 60.

The compensation circuit unit 200 itself can determine the compensation value for the output of the components contained therein and output the compensated control signal. Thus, the microwave oven of the present invention can provide the same output to the user despite the error of the component output. This will be described in detail later.

The rectifying unit 50 can convert the commercial AC power source 10 applied to the inverter unit 20 into a DC power source. At this time, the rectifying unit 50 may include a transformer and a converter unit, though it is not clearly shown in the drawing. The transformer uses a transformer in which coils are wound on the primary side and the secondary side, respectively. The primary side senses the variation of the AC supplied from the commercial AC power source 10, and the secondary side coils are driven by the fluctuations of the primary side coils And forms an induced current to transfer it to the converter. The converter unit is connected to the secondary coil to rectify the variation of the alternating current. For example, the converter section may include a full-wave rectifying section, a half-wave rectifying section, and a plurality of diodes. However, the present invention is not limited thereto.

The compensation circuit unit 200 receives the DC power from the rectifying unit 50 and can generate a control signal for controlling the switching frequency generator 60 using the DC power. At this time, the compensation circuit unit 200 measures the average value of the DC power received from the rectifying unit 50 based on the reference power supply, compares the reference value corresponding to the reference power supply with the average value, and controls the switching frequency generating unit 60 The compensation value of the control signal can be determined. As a result, the compensation circuit unit 200 can control the operation of the switching unit 24 including a plurality of switching elements through the control signal, and can provide a control signal with a reduced error using the compensation value .

Accordingly , the present invention realizes the same performance in the same product, thereby enhancing the performance reliability of the consumer's product and increasing the satisfaction of the consumer.

<37> Figure 4 is a block diagram showing the components of the compensation circuit of Fig. 5 is a view for explaining the AD value according to the scattering of the regulator included in the compensation circuit portion of FIG. FIG. 6 is a diagram for explaining the operation of the compensation circuit of FIG. 3. FIG.

If <38> 4, the compensation circuit 200 according to some embodiments of the invention may comprise a microcomputer 210 and the regulator 220. The

The microcomputer 210 receives the reference power source ref_v from the regulator 220 and receives DC power from the rectifier unit 50. The regulator 220 provides the reference power source ref_v to the microcomputer 210.

<40> In this case, the microcomputer 210 includes a AD through the DC link (DC link) terminal; may be input to (Analog to Digital hereinafter AD) value. At this time, the reference power source ref_v of the regulator 220 may affect the AD value measured through the DC link terminal.

If <41> Referring to Figure 5, the microcomputer 210 measures the DC power inputted from the rectifying section 50 is made using the reference power source (ref_v) received from the regulator 220. When the regulator 220 provides a reference power (ref_v) of exactly 5V in a microwave oven of 220 VAC commercial AC power, the microcomputer 210 outputs an accurate AD The value can be measured.

<42>, however, be provided as low as 4.9V to the reference power (ref_v) The microcomputer 210 of the regulator 220, if provided, as high as 5.1V, the AD value, the error between the original AD value actually measured . Such an error may increase as the reference power source ref_v of the regulator 220 is further away from 5V.

The regulator 220 should in principle generate a constant reference power ref_v. However, the regulator 220 may have a certain error during the production process of the regulator 220. Analysis of the plurality of regulators 220 shows that there is a certain amount of scatter in the reference power supply ref_v provided by the regulator 220 Able to know. The dispensing of this regulator 220 can also affect the final output of the microwave (see the description of FIG. 9, described below).

<44> The microcomputer 210 of the present invention by performing a compensation algorithm for compensating the error of the reference power (ref_v) of the regulator 220, it is possible to allow the microwave oven to implement a constant power.

If <45> Referring to Figure 6, the microcomputer of the present invention belonging to the reference power (ref_v) a first power range (e.g., 5V) to the average value of the AD value of the DC power received from the rectification part 50 belonging The compensation value of the reference power supply ref_v can be determined using a power supply period (for example, 4.9 V).

<46> More specifically, the microcomputer 210 stops the measurement of the AD value until the voltage of the DC link terminals stabilization.

If <47> Then, a voltage of the DC link terminals stabilized, the microcomputer 210 measures the AD value of the DC link terminal. For example, the AD value can be stabilized after 1.5 seconds from when the DC voltage of the rectifying part 50 is applied to the microcomputer 210 at the time when the voltage of the DC link terminal is stabilized. That is, the microcomputer 210 can measure the AD value using the measured value after 1.5 seconds after the direct current power is applied from the rectifying part 50. [

<48> Then, the microcomputer 210 calculates the average value of the AD value after the stabilized. Then, the microcomputer 210 determines which interval the average value of the AD values belongs to. For example, the interval in which the mean value of the AD value is included in the microcomputer 210 may be 4.9V.

<49> Then, the microcomputer 210 may, for intermediate values and the interval is a reference power source (ref_v) (such as the mean value of the period belonging to the AD value (e.g., 4.9V in Fig. 6), as shown in FIG. 6 5V) and determines the difference value as a compensation value of the reference power supply ref_v. For example, it may be 0.1 V in Fig.

<50> Then, the microcomputer 210 may be applied to the measured value of the calculated compensation value AD. At this time, the microcomputer 210 can determine the compensation value of the reference power source ref_v within a certain range. For example, the microcomputer 210 can determine the compensation value of the reference power source within a range of -0.2V to 0.2V. However, the present invention is not limited thereto, and the range can be adjusted within a range of -0.1 V to 0.1 V. The range is determined in consideration of dispersion of the regulator 220, and may be changed as needed.

<51> Then, the microcomputer 210 stores the compensation value determined for the non-volatile memory included in the microwave oven, and by the microcomputer 210 upon restart of the microwave oven is used for the compensation value stored in the nonvolatile memory, AD The value can be measured. The non-volatile memory may be included in the compensation circuit section 200 or may be located outside the compensation circuit section 200.

<52> However, the present invention is not limited thereto, the microcomputer 210 compares the average value (that is, the average value of the AD value) and a predetermined voltage compensation table for the DC power received from the rectification part 50, the microcomputer The compensation value of the control signal output from the controller 210 can be determined. A detailed description thereof will be described later.

<53> Figure 7 is a flow chart illustrating a control method of a microwave oven according to an embodiment of the present invention.

<54> 7, the control method of the microwave oven according to an embodiment of the present invention, first, a magnetron (40 in Fig. 3) AC power is applied to the drive unit 20 to provide a power source for driving (10) is converted from the rectifying section (50) to DC power.

<55> Then, the microcomputer 210 includes a voltage of the DC link terminals to the average measurement of the AD value, the more accurate DC link terminals to receive via the single measuring the direct-current power supply of the holding portion 50 (that is, the DC link terminals) (S110). That is, the microcomputer 210 stops measuring the AD value until the voltage of the DC link terminal is stabilized, which may be about 1.5 seconds. However, the present invention is not limited thereto.

<56> Accordingly, the microcomputer 210 may, after the DC power applied through the DC link terminals, by using the AD value determined after about 1.5 seconds to calculate the average value of the direct current power source. However, this is only an example, and the present invention is not limited thereto.

<57> Then, the microcomputer 210 measures the DC voltage of only the measurement on the basis of the reference power (ref_v) (i.e., DC link terminal), and to calculate the average value of the measured voltage (S120).

<58> Then, the microcomputer 210 determines the compensation value of the control signal output by comparing the reference value corresponding to the calculated average voltage and the reference power (ref_v) in the microcomputer 210 (S130). At this time, the microcomputer 210 can control the operation of the switching unit 24 including a plurality of switching devices by determining the compensation value of the control signal for controlling the switching frequency generating unit 60. At this time, the microcomputer 210 may provide a control signal with a reduced error by the regulator 220 using the compensation value.

<59> Then, the compensated value of the control signal output from microcomputer 210 is stored in the memory (S140). At this time, the memory includes a nonvolatile memory.

<60> compensation value of the control signal stored in the memory can be used at the same time recovering the microwave again microcomputer 210. That is, at restart, the microcomputer 210 can measure the AD value using the compensation value stored in the nonvolatile memory. The non-volatile memory may be included in the compensation circuit section 200 or may be located outside the compensation circuit section 200.

<61> Figure 8 is a flow chart illustrating a control method of a microwave oven according to another embodiment of the present invention. 9 is a graph for explaining the effect of the microwave oven according to some embodiments of the present invention. For the sake of convenience of description, the same elements as those of the above-described embodiment will be described below with the exception of duplicate descriptions.

If <62> Referring to Figure 8, a control method of a microwave oven according to another embodiment of the present invention, it is determined whether the first voltage of the DC link terminals is a direct current power source is stabilized (S210). At this time, whether the voltage of the DC link terminal is stabilized can be determined whether or not a predetermined time has elapsed after the voltage is applied to the DC link terminal. For example, after a voltage is applied to the DC link terminal, it may be determined that the voltage of the DC link terminal has stabilized after about 1.5 seconds have elapsed. However, this is merely an example, and the present invention is not limited thereto.

If <63> Then, that this input voltage of the DC link terminals stabilized, the microcomputer 210 measures the AD value of the DC link terminal. At this time, the microcomputer 210 measures the DC voltage of the measurement terminal (i.e., DC link terminal) based on the reference power source ref_v and calculates an average value of the measured voltage (S220).

<64> Then, the microcomputer 210 determines the compensation value of the control signal output by comparing the reference value corresponding to the calculated average voltage and the reference power (ref_v) from the microcomputer 210. The At this time, the microcomputer 210 determines the compensation value using a predetermined voltage compensation table. For example, the voltage compensation table is shown in Table 1 below.

< Table 1>

<66> gawAdStepTable [] = {23208, 22972, 22741, 22515, 22291, 22073}

<67> gaswAdCompensationTable [] = { -462, -462, -228, 0, 224, 444}

<68> where, gawAdStepTable [] is an array for the AD values measured in the microcomputer (210), gaswAdCompensationTable [] is an array for the compensation value corresponding to gawAdStepTable []. That is, gawAdStepTable [] corresponds to the voltage value array, and gaswAdCompensationTable [] corresponds to the compensation value array.

<69> The voltage value array and the compensation value array may be a one-to-one basis. Hereinafter, it is assumed that the voltage value arrangement and the compensation value arrangement are '6' as in Table 1, respectively. However, the present invention is not limited thereto, and the size of the array may be varied.

<70> Then, the count (Count) value determines whether less than a size (e.g., 6) of the array to determine the compensation values (S231).

<71> Then, count (Count) value (e.g., 6) the size of the array is less a case, the microcomputer 210, the voltage value of the voltage average value of the AD value array calculated from more to determine the compensation value [Count] (S233). &Lt; / RTI &gt;

<72> If, when the average voltage is less than the voltage value array [Count], thereby increasing the count value (Count) (S235). Then, steps S231 and S233 are repeated using the increased count value.

<73> If, when the average voltage is greater than the voltage value array [Count], the voltage compensation value is a compensation value array [Count] value (S237).

<74> Specifically, for example, count (Count) value is '0', and the voltage average value in this case is "23000", the voltage value arranged so [0] is "23 208", a voltage average voltage value array [Count ]. Then, since the count value is increased to '1' and the count value is smaller than '6', the voltage average value '23000' is compared with the voltage value array [1] '22972'. In this case, since the voltage average value 23000 'is larger than the voltage value arrangement [1]' 22972 ', the voltage compensation value is determined to be -462, which is the compensation value arrangement [1]. However, this is merely one example, and the present invention is not limited thereto or limited thereto.

<75> Then, the determined voltage compensation values stored in the memory is used (S240). At this time, the memory includes a volatile memory or a nonvolatile memory. For example, the memory may comprise one or more volatile memory devices and / or electrical erasable programmable ROM (EEPROM), flash memory, etc., such as Double Data Rate Static DRAM (DDR SDRAM), Single Data Rate SDRAM Or non-volatile memory devices, such as non-volatile memory devices.

The voltage compensation value stored in the memory can be used again when the microwave oven is restarted. That is, the microcomputer 210 may measure the AD value during restart and apply the voltage compensation value stored in the nonvolatile memory to the measured AD value.

<77><B> of the Referring to Figure 9, <A> of Figure 9 shows the variation analysis prior to the compensation algorithm of the control method of the microwave oven according to the present invention is applied, Figure 9 is a microwave oven according to the present invention The results of the scatter analysis after applying the compensation algorithm of the control method are shown.

The results of the scatter analysis before applying the compensation algorithm of the microwave oven control method of the present invention are as follows. The maximum output is 1900 W, the average output is 1926 W, the maximum output and the minimum output are 1962 W and 1888 W, The difference between the minimum output is 74 W, which is above the 2% error range of the average output.

The results of the scatter analysis after applying the compensation algorithm of the control method of the microwave oven of the present invention show that the maximum output is 1900 W, the average output is 1899 W, the maximum output and the minimum output are 1930 W and 1866 W, respectively, The difference between the maximum output and the minimum output is 64W, which corresponds to a margin of error of 2% of the average output. However, this is only one experimental example, and the present invention is not limited thereto or limited thereto.

<80> Accordingly, through the compensation algorithm of the control method of the microwave oven according to the present invention, it can be confirmed that the variation of the output of the microwave improved.

<81> In other words, such a control method of a microwave oven according to the present invention, by considering the variation of the output voltage to perform the compensation over the output compensation algorithm can be equally implemented with the output of the product. As a result, the same performance can be realized in the same product, so that the performance reliability of the product of the consumer can be increased and the satisfaction of the consumer can be increased. In addition, it is possible to reduce the consumer's claim and the return rate according to the output deviation of the product, thereby reducing the cost required for the AS of the product and lowering the defect rate of the product.

The foregoing embodiments are to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description. It is intended that all changes and modifications that come within the meaning and range of equivalency of the claims, as well as any equivalents thereof, be within the scope of the present invention.

10: Commercial AC voltage section 20: Inverter section
30: Magnetron drive unit 40: Magnetron
50: rectification part 60: switching frequency generator
100: inverter circuit device 200: compensation circuit part
210: Microcomputer 220: Regulator

Claims (17)

An inverter unit for switching a plurality of switching elements to provide a power source for magnetron driving for generating a microwave;
A rectifier for converting AC power applied to the inverter to DC power; And
A compensation unit that measures an average value of the DC power supplied from the rectifying unit based on the reference power supply and compares a reference value corresponding to the reference power supply with the average value to determine a compensation value of a control signal for controlling the plurality of switching devices Including circuitry
Microwave.
The method according to claim 1,
Wherein the compensation circuit section comprises:
A regulator for providing the reference power;
And a microcomputer receiving the reference power from the regulator and receiving the DC power from the rectifying unit,
Wherein the micom determines a compensation value of the reference power source using a first power source section to which the reference power source belongs and a second power source section to which an average value of the DC power source belongs.
3. The method of claim 2,
Wherein the micom determines a difference value between an intermediate value of the first power source interval and an intermediate value of the second power source interval as a compensation value of the reference power source.
The method of claim 3,
Wherein the microcomputer determines a compensation value of the reference power source within a range of -0.2V to 0.2V.
3. The method of claim 2,
Wherein the microcomputer calculates the average value of the DC power using a value measured after a predetermined time after the DC power is applied from the rectifying unit.
6. The method of claim 5,
Wherein the microcomputer calculates the average value of the DC power using a value measured after 1.5 seconds after the DC power is applied from the rectifying unit.
3. The method of claim 2,
Wherein the compensation circuit unit compares an average value of the DC power supply with a predetermined voltage compensation table to determine a compensation value of the control signal.
8. The method of claim 7,
Wherein the voltage compensation table includes a voltage value array corresponding to an average value of the DC power source and a compensation value array corresponding to the voltage value array.
The method according to claim 1,
Wherein the compensation circuit section stores the determined compensation value in the nonvolatile memory and uses the compensation value stored in the nonvolatile memory when the microwave oven is restarted.
A microwave oven control method for generating microwaves through magnetron driving,
Converting an AC power applied to an inverter unit that supplies power for driving the magnetron to DC power;
Measuring an average value of the DC power source based on a reference power source in the microcomputer; And
Comparing the average value with a reference value corresponding to the reference power source and determining a compensation value of a control signal provided to the inverter unit
Control method of microwave oven.
11. The method of claim 10,
Further comprising the step of determining whether the stabilization of the DC power source is completed in the microcomputer before the step of measuring the average value of the DC power source.
12. The method of claim 11,
Wherein the step of determining whether the stabilization of the DC power source is completed comprises:
And determining whether the stabilization is completed based on whether or not a predetermined time has elapsed after the direct current power is applied to the microcomputer.
11. The method of claim 10,
Wherein the step of measuring the average value of the direct-
And calculating the average value of the DC power using a measured value after 1.5 seconds after the DC power is applied to the microcomputer.
11. The method of claim 10,
Wherein the step of determining the compensation value of the control signal comprises:
And comparing the average value of the DC power supply with a predetermined voltage compensation table to determine a compensation value of the control signal.
15. The method of claim 14,
Wherein the voltage compensation table includes a voltage value array corresponding to an average value of the DC power source and a compensation value array corresponding to the voltage value array.
16. The method of claim 15,
Wherein the voltage value arrangement and the compensation value arrangement each include six array values.
11. The method of claim 10,
Storing the compensation value in a non-volatile memory and using the compensation value stored in the non-volatile memory upon restart of the microwave oven
And calculating the concentration of the microwave oven.

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