KR20140069564A - System for induction heating and power dividing method for the same - Google Patents

Abstract

An induction heating system according to the present invention includes: a plurality of induction heating units which are separately formed on a heating target with a preset interval; a first power distributing unit which distributes total power for heating the heating target to a preset temperature in proportion to each maximum power of the induction heating units; a compensation power calculating unit which calculates a compensation power value for compensating a loss due to the induction heating unit which is abnormally operated when the heating target is heated; and a second power distributing unit which distributes the compensation power value to the induction heating unit following the induction heating unit which is abnormally operated.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an induction heating system and a power dividing method,

The present invention relates to an induction heating system and a power distribution method thereof, and more particularly, to an induction heating system including a plurality of induction furnaces and a power distribution method thereof.

The induction heating system uses the heat generated by the eddy current loss and the hysteresis loss caused by the high frequency alternating current in the heating body by flowing a high frequency alternating current to the heating coil surrounding the heating body, It is a system that heats the sieve. That is, when a high frequency current flows through the heating coil, a strong high frequency magnetic field is formed around the coil, and the surface of the heating target adjacent to the heating coil is heated.

The induction heating system may include a plurality of induction heaters formed at predetermined intervals in the moving direction of the heated body. Since the plurality of induction heating elements are spaced apart at a predetermined interval, the heating target can be continuously heated during the movement of the heating target.

However, even if a plurality of induction heating units are designed to have different capacities and even if they are designed with the same capacity, the maximum output power that can be actually output may be different as the device ages depending on use. In addition, the number of induction heating elements to be used may be varied depending on the characteristics of the heating target, the temperature to be heated, the induction heating operation cost, and the like.

However, in the induction heating system according to the related art, a power value obtained by dividing the total electric power for heating the object to be heated up to the set temperature by the number of total induced heaters is supplied to the induction heater, The power distribution can not be performed efficiently, which is an inefficient problem.

In addition, the induction heating system according to the related art has a problem in that it can not heat the object to be heated up to the set temperature because it does not perform compensation control for induction heating which operates abnormally during operation.

This will be described in more detail with reference to FIG.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a graph showing a change in temperature of a heating target with time in heating a heating target using an induction heating system according to the prior art; Fig.

In Fig. 1, a dotted line indicates a change in temperature of the heating target when all of a plurality of induction heating operations are normal, and a solid line indicates that the heating target can not be heated due to the abnormal operation of the induction heating corresponding to the second heating zone Indicates the temperature change of the heating target.

As can be seen from Fig. 1, when all of the induction heating furnaces operate normally, it can be seen that the temperature of the heating target body rises in a plurality of heating sections. In a plurality of cooling sections in which the induction heating furnace is spaced It can be seen that the temperature drops. As described above, the heated object passes through a plurality of heating sections and cooling sections and is heated to a set temperature to be controlled.

However, in the case where the induction heater for heating the object to be heated in the second heating section operates abnormally, the temperature of the object to be heated does not rise to a temperature that should be originally heated, and falls continuously until the third heating section starts.

In addition, even if the third heating period starts, the induction heater corresponding to the third heating period heats the heating target with an output as originally set. Therefore, as shown in FIG. 1, do.

That is, the heating target is not heated up to the set temperature to be heated, and is heated to a temperature as low as the temperature error. Such a temperature error causes a problem in the reliability of the induction heating system and adversely affects the quality of the heating target, which is problematic.

An object of the present invention is to provide an induction heating system and an electric power distribution method for efficiently dissipating electric power according to the performance of induction heating, the number of induction heating elements, and the like.

It is another object of the present invention to provide an induction heating system capable of heating a target to be heated to a target temperature even if there is a problem in induction heating during heating of the target to be heated, The technical problem is to provide.

According to an aspect of the present invention, there is provided an induction heating system comprising: m induction heating elements arranged at predetermined intervals on a heating body to sequentially heat the heating body; And a controller for distributing electric power to the m pieces of induction heater for sequentially heating the object to be heated, wherein, when the nth induction heating operation of the heating target body is abnormal, And the power of the n-th induction heating is redistributed to the induction heating after induction heating.

According to another aspect of the present invention, there is provided a power distribution method for an induction heating system, the method comprising: dividing a total power required for heating a target to be heated to a set temperature into a plurality of proportional Calculating a distributed primary power distribution value; Wherein when the nth induction heater during heating the heating target according to the primary power distribution value fails to output the primary power distribution value, Calculating a compensation power value; And adding the compensation power value to the output of the induction heater after the n-th induction heating to heat the heating target to the set temperature.

According to the present invention, it is possible to efficiently dissipate the electric power applied to each induction heating considering the deterioration of induction heating, the total number of induction heating, and the difference between the induction heating capacity.

In addition, according to the present invention, there is an effect of compensating for a loss due to an abnormal operation when induction heating occurs abnormally during operation of the induction heating system, so that the heated object can be heated normally to a set temperature to be reached .

Further, according to the present invention, there is an effect of improving the reliability of the induction heating system through efficient power distribution and compensation control for abnormal operation.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a graph showing a change in temperature of a heating target with time in heating a heating target using an induction heating system according to the prior art; Fig.
2 is a block diagram schematically illustrating an embodiment of an induction heating system according to the present invention.
3 is a view showing one embodiment of induction heating of the induction heating system according to the present invention. FIG. 4 is a graph showing a change in temperature of the heating target with time when the heating target is heated using the power compensation value in the induction heating system according to the present invention. FIG.
FIG. 5 is a graph showing the temperature change of the heating target with time when the heating target is heated using the tertiary power distribution unit in the induction heating system according to the present invention. FIG.
FIG. 6 is a graph showing the temperature change of the heating target with time when the heating target is heated using the tertiary power distribution unit in the induction heating system according to the present invention. FIG.
7 is a flowchart showing an embodiment of a power distribution method of the induction heating system according to the present invention.

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

2 is a block diagram schematically illustrating an embodiment of an induction heating system according to the present invention.

2, the induction heating system 100 according to the present invention includes a plurality of induction furnaces 110, and a control unit 120. As shown in FIG.

A plurality of induction heater (s) 110 are formed at predetermined intervals in the traveling direction of the heated body 200.

Each of the plurality of induction heater heaters 110 causes a high frequency alternating current to flow through the heating coil surrounding the heating target 200 so that the eddy current loss generated in the heated body 200 due to the high frequency alternating current and the hysteresis The heating target 200 is heated by using the heat generated by the loss. That is, when a high-frequency current flows through the heating coil, a strong high-frequency magnetic field is formed around the coil, and the surface of the target 200 adjacent to the heating coil is heated.

To explain this in more detail, reference is made to FIG.

3 is a view showing one embodiment of induction heating included in the induction heating system according to the present invention.

2 and 3, the plurality of induction heater 110 is spaced apart from the heated body 200 by a predetermined distance to heat the heated body 200.

Since the plurality of induction heater 110 are arranged in parallel in parallel to the moving direction of the heating target 200 and spaced apart at predetermined intervals, the heating target 200 is continuously heated The body 200 can be heated.

That is, since the object to be heated 200 sequentially passes through the first heating section, the second heating section, the nth heating section, the (n + 1) th heating section, and the (n + And heated by a heater.

Since the plurality of induction heater openings 110 are spaced apart from each other by a predetermined interval, when the object to be heated 200 passes through the heating section and then passes through the interval between the induction heater, natural cooling occurs .

That is, the object to be heated 200 has a first cooling section after passing through the first heating section, a second cooling section after passing through the second heating section, an nth cooling section after passing through the nth heating section, The (n + 1) th cooling section, and the (n + 2) th heating section. The control unit 120 may include a primary power dividing unit 130 and a compensation power calculating unit 140, And may further include a secondary power distributor 150 and a tertiary power distributor 160.

The primary power distributor 130 distributes the total power required for heating the target object 200 to a set temperature in proportion to the respective maximum output powers of the induction furnaces.

The plurality of induction heater 110 may be designed to have different capacities depending on the case, and even if the same capacity is designed, the maximum output power that can be actually output may be different as the device ages depending on usage. In addition, the number of induction heating elements to be used may be varied depending on the characteristics of the heated body 200, the temperature to be heated, the induction heating operation cost, and the like.

Accordingly, the primary power distributor 130 reflects the number and characteristics of the induction heater so that the total power is distributed in proportion to the maximum output power of each induction furnace.

To this end, in one embodiment, the first power divider 130 divides the maximum output power (PowerRate (n)) that the actual induction heating can maximally output into a plurality of induction heating maximum output powers (PowerRateRatio (n)), which is a value obtained by dividing the total power divided by the total power ratio (TotalPowerRate).

This can be expressed by the following equation (1).

[Equation 1]

PowerRateRatio (n) = PowerRate (n) / TotalPowerRate

The primary power distribution unit 130 multiplies the above-described power distribution ratio by the total power P_ref for heating the heating target 200 to the set temperature by the induction heating system to obtain the primary power distribution value P1_ref (n) And distributes the primary power distribution value to each induction heating element.

This can be expressed by the following equation (2).

&Quot; (2) "

P1_ref (n) = P_ref * PowerRateRatio (n)

For example, when the maximum output power (PowerRate (1)) of the first induction heating furnace is 10, the maximum output power (PowerRate (2)) of the second induction heating furnace is 20, When the output power (PowerRate (3)) is 30 and the maximum output power (PowerRate (4)) of the fourth induction heating furnace is 40, the total output power total output power to be.

Therefore, the power distribution ratios of the first to fourth induction heating fans are as follows.

PowerRateRatio (1) = 10/100 = 0.1

PowerRateRatio (2) = 20/100 = 0.2

PowerRateRatio (3) = 30/100 = 0.3

PowerRateRatio (4) = 40/100 = 0.4

At this time, if the total power P_ref for heating the heated body 200 to the set temperature is 33, the primary power distribution values distributed to the plurality of induction furnaces are as follows.

P1_ref (1) = P_ref * PowerRateRatio (1) = 33 * 0.1 = 3.3

P1_ref (2) = P_ref * PowerRateRatio (2) = 33 * 0.2 = 6.6

P1_ref (3) = P_ref * PowerRateRatio (3) = 33 * 0.3 = 9.9

P1_ref (4) = P_ref * PowerRateRatio (4) = 33 * 0.4 = 13.2

When the primary power distribution value is compared with the maximum output power of each induction heating coil, the induction heating ratio is considered as follows.

First induction heating operation rate = P1_ref (1) / PowerRate (1) * 100 = 33%

Second induction heating operation rate = P1_ref (2) / PowerRate (2) * 100 = 33%

Third induction heating operation rate = P1_ref (3) / PowerRate (3) * 100 = 33%

Fourth induction heating operation rate = P1_ref (4) / PowerRate (4) * 100 = 33%

On the other hand, as in the induction heating system according to the related art, when the total electric power is divided into the total induction heating number, the operation ratio of the induction heating is as follows.

First induction heating operation rate = (33/4) / 10 * 100 = 82.5%

Second induction heating operation rate = (33/4) / 20 * 100 = 41.25%

Third induction heating operation rate = (33/4) / 30 * 100 = 27.5%

Fourth induction heating operation rate = (33/4) / 40 * 100 = 20.625%

That is, according to the prior art, the first induction heater has an operating power ratio of 82.5%, which is an excessively large amount of output power compared to the maximum output power, while the fourth induction heater has a small amount of output power It can be seen that only 20.625% is not operated. In this case, the first induction heater causes a relatively severe heat generation, and there is a problem that the lifetime can be shortened due to a high utilization ratio or failure can be caused.

However, when the total power is divided according to the first power divider 130 according to the present invention, since the operation ratios of the first to fourth induction heating units are equalized (33%), The inefficiency such that the operation ratio is excessively high and the induction heating is overloaded can be eliminated, and the efficiency and stability of the system can be improved.

On the other hand, when the temperature of the heating target 200 passing through the plurality of induction heating coils is lower than the set temperature, that is, by the compensation by the compensation power value to be described later, The first power distribution value may be readjusted to compensate for the difference between the final temperature of the heating target 200 and the set temperature if the heating element 200 is not heated up to the set temperature. A detailed description thereof will be given later with reference to FIG. 6 after explaining the compensation power value.

The compensation power calculating unit 140 calculates a compensation power value for compensating for a loss due to induction heating that is abnormally operated during heating of the heating target 200. [

In one embodiment, the compensation power value includes the primary power distribution value that the induction heater failed to operate.

Further, in another embodiment, the compensation power value is determined by the nth induction heating in the section through which the nth induction heater in which the heating target 200 operates abnormally does not heat the heating target 200 And may further include additional power for compensating for the temperature drop of the heated body 200,

This will be described in more detail with reference to FIG.

4 is a graph showing the temperature change of the heated body 200 with time when the heated body 200 is heated using the power compensation value in the induction heating system according to the present invention.

In Fig. 4, the dotted line indicates the temperature change of the heated object 200 when all of the induction heating furnaces are normally operated, and the solid line indicates that the n-th induction heating corresponding to the nth heating section is abnormal, When the body 200 is not heated, the temperature of the heated body 200 changes.

As can be seen from Fig. 4, when all of the induction heating furnaces operate normally, it can be seen that the temperature of the heated body 200 rises in a plurality of heating sections, and a plurality of induction heating furnaces It can be seen that the temperature falls in the cooling section. As described above, the heated object 200 is heated to a set temperature to be controlled through a plurality of heating and cooling sections.

However, when the induction heater for heating the object to be heated 200 in the n-th heating section is operated in an abnormal state, the temperature of the heating target 200 can not be raised to a temperature at which the heating target 200 is originally heated, Continue to descend until it starts.

At this time, the temperature drop due to the abnormal operation of the n-th induction heating can be expressed as follows.

? Td = Td1 + Td2

Td1 represents the temperature at which the primary power distribution value divided by the n-th induction heater is not outputted, and Td2 represents the temperature at which the n-th induction heater does not heat the heating target 200, Means the temperature drop that occurred during the passage.

The compensation power calculating unit 140 calculates a compensation power value CV (n) for compensating for the temperature drop ΔTd due to the abnormal operation of the n-th induction heating.

2 and 3, the secondary power dividing unit 150 divides the compensation power value into the induction heating after the induction heating for the abnormal operation to calculate the secondary power distribution value.

In one embodiment, the secondary power divider 150 may add the compensation power value to the (n + 1) -th induction heater in which the n-th induced induction heater is arranged after the abnormal operation.

In this case, the secondary power distribution value divided into the (n + 1) th induction heating can be expressed by Equation (3) as follows.

&Quot; (3) "

P2_ref (n + 1) = P1_ref (n + 1) + CV (n)

In this case, P2_ref (n + 1) is a secondary power distribution value distributed to the (n + 1)

P1_ref (n + 1) is the primary power distribution value divided by the (n + 1) th induction heating and CV (n) is the compensating power value due to the nth induced induction heating operation.

As shown in FIG. 4, when the (n + 1) th induction heater outputs a newly divided secondary power distribution value, the temperature of the heated body 200 at the end of the (n + 1) It can be seen that the heater is heated to the same temperature when the heater operates normally (dotted line portion).

In another embodiment, the secondary power distributor 150 may distribute the compensation power value in proportion to a maximum output power of each of a plurality of induction furnaces arranged next to the n < th > .

That is, in the above-described embodiment, CV (n) is distributed to all the induction heat from the n + 1th induction heating to the last induction heating, unlike the case where all the CV (n) Distribution. Also, for example, the value that is distributed to each induction heater can be distributed in proportion to the maximum output power of each induction heater.

When the sum of the compensation power value and the primary power distribution value distributed to the (n + 1) -th induction heater exceeds the maximum output power of the (n + 1) -th induction heater, the tertiary power distributor 160 , And the excess power is distributed to the (n + 2) -th induction heater.

Hereinafter, this will be described in detail with reference to FIG.

5 is a graph showing the temperature change of the heating target 200 with time when the heating target 200 is heated using the tertiary power distributing unit 160 in the induction heating system according to the present invention. to be.

5, the dotted line indicates a change in temperature of the heated object 200 when all of the plurality of induction heating appliances are normally operated, and the solid line indicates that the induction heater corresponding to the nth heating section operates abnormally, When the body 200 is not heated, the temperature of the heated body 200 changes.

As can be seen from Fig. 5, when all of the induction heating furnaces operate normally, it can be seen that the temperature of the heated body 200 rises in a plurality of heating sections, and a plurality of induction heating furnaces It can be seen that the temperature falls in the cooling section. As described above, the heated object 200 is heated to a set temperature to be controlled through a plurality of heating and cooling sections.

However, when the induction heater for heating the object to be heated 200 in the n-th heating section is operated in an abnormal state, the temperature of the heating target 200 can not be raised to a temperature at which the heating target 200 is originally heated, Continue to descend until it starts.

At this time, the temperature drop due to the abnormal operation of the n-th induction heating can be expressed as follows.

? Td = Td1 + Td2

Td1 represents the temperature at which the primary power distribution value divided by the n-th induction heater is not outputted, and Td2 represents the temperature at which the n-th induction heater does not heat the heating target 200, Means the temperature drop that occurred during the passage.

At this time, as described above, the compensation power calculating unit 140 calculates the compensation power value CV (n) for compensating the temperature drop ΔTd due to the abnormal operation of the n-th induction heating.

In one embodiment, the secondary power divider 150 may add the compensation power value to the (n + 1) -th induction heater in which the n-th induced induction heater is arranged after the abnormal operation.

At this time, the secondary power distribution value P2_ref (n + 1) distributed to the (n + 1) th induction heating can be expressed as P1_ref (n + 1) + CV (n).

However, when the secondary power distribution value newly allocated to the (n + 1) th induction heating exceeds the maximum output power (PowerRate (n + 1)) of the n + Can not output the newly distributed secondary power value.

In this case, since the (n + 1) -th induction heater does not output all of the compensation power values, a temperature drop corresponding to ΔT1 appears after the heating target 200 has passed the (n + 1) heating period.

Therefore, the third power divider 160 multiplies the (n + 1) th induction heating maximum output power (PowerRate (n + 1)) from the secondary power distribution value P2_ref +1)) to the induction heater located after the (n + 1) th induction heater. At this time, the power distribution value is referred to as a tertiary power distribution value.

If the (n + 2) -th induction heater in the embodiment receives all of the power excess, the newly distributed third power distribution value is output. As shown in FIG. 5, It can be seen that the temperature of the object 200 to be heated is heated to the same temperature as the n-th induction heating normally operates (dotted line portion).

Referring again to FIGS. 2 and 3, the induction heating system according to the present invention may further include a temperature sensor 170. The temperature sensor 170 is installed after the induction heating to measure the temperature of the heating target 200 and feeds back the measured temperature to the primary power distribution unit 130.

The temperature sensor 170 feeds back the final heating temperature of the heating target 200 through which a plurality of induction heating coils have passed to the primary power distributing unit 130 so that the primary power distributing unit 130 supplies the fourth power So that it is possible to judge whether the value should be calculated.

Hereinafter, FIG. 6 is referred to in order to explain this in more detail.

6 is a graph showing a change in temperature of the heating target 200 with time when the heating target 200 is heated using the tertiary power distributing unit 160 in the induction heating system according to the present invention. to be.

6, the dotted line indicates the temperature change of the heated object 200 when all of the induction heating furnaces are normally operated, and the solid line indicates that the n-th induction heating corresponding to the nth heating section operates abnormally, When the body 200 is not heated, the temperature of the heated body 200 changes.

6, when the induction heater for heating the object to be heated 200 in the nth heating section operates abnormally, the temperature of the heating target 200 does not rise up to a temperature at which the heating target 200 is originally heated, +1 Continue to descend until the heating section begins.

At this time, as described above, the compensation power calculating unit 140 calculates the compensation power value CV (n) for compensating the temperature drop ΔTd due to the abnormal operation of the n-th induction heating.

In one embodiment, the secondary power divider 150 may add the compensation power value to the (n + 1) -th induction heater arranged after the n-th induced induction heating to operate as the n + 1 th The secondary power distribution value (P2_ref (n + 1)) distributed to the induction furnace can be expressed as P1_ref (n + 1) + CV (n).

However, when the secondary power distribution value newly allocated to the (n + 1) th induction heating exceeds the maximum output power (PowerRate (n + 1)) of the n + Since the newly distributed secondary power value can not be output, a temperature drop corresponding to? T1 is obtained after the heating target 200 has passed the (n + 1) th heating period.

Therefore, the third power divider 160 multiplies the (n + 1) th induction heating maximum output power (PowerRate (n + 1)) from the secondary power distribution value P2_ref +1)) is subtracted from the output power of the induction heater disposed after the (n + 1) th induction heating.

However, if the n + 2th induced induction heater has been allotted the power excess, the newly distributed third power divided value exceeds the maximum output power (PowerRate (n + 2)) of the induction heating of n + 2th , It can be seen from FIG. 6 that the temperature of the heated body 200 at the end of the (n + 2) -th heating section is decreased by? T2 as compared with when the nth induction heating normally operates .

At this time, if the (n + 2) -th induction heater is the last induction heater of the induction heating system according to the present invention, the heated object 200 may not be heated up to the set temperature which is the target temperature.

When the final temperature of the heating target 200 becomes lower than the set temperature after the plurality of induction heating by the temperature sensor 170 has been completed in this way, And the fourth-order power distribution value is calculated to compensate for the difference between the set temperature and the set temperature.

In one embodiment, the primary power divider may raise the primary power distribution value of the induced heater disposed prior to the n-th induction heating to yield a fourth order power distribution value. When the induction heater starts outputting the fourth power distribution value, the heating target 200 can be heated again to the set temperature.

7 is a flowchart showing an embodiment of a power distribution method of the induction heating system according to the present invention.

7, in the electric power distribution method of the induction heating system according to the present invention, the total electric power required for heating the target to be heated to a set temperature is distributed in proportion to the respective maximum output powers of the plurality of induction furnaces The primary power distribution value is calculated (S1100).

To this end, in one embodiment, the primary power dividing unit may calculate the sum of the maximum output powers of the induction heating units (TotalPowerRate (n)) that normally operates the maximum output power (PowerRate ) (PowerRateRatio (n)) is calculated for each induction heating.

The primary power distribution unit calculates the above-described power distribution ratio by multiplying the above-described power distribution ratio by the total power (P_ref) for heating the heating target body to the set temperature by the induction heating system to calculate the primary power distribution value P1_ref (n) The distribution values are distributed to each induction heater.

Next, if the nth induction heater during heating of the heating target according to the primary power distribution value fails to output the primary power distribution value (S1200), it is determined that the nth induction heating operation A compensation power value for compensating the loss is calculated (S1300).

The compensation power value includes an additional power for compensating for the temperature drop of the heated body due to the abnormal power operation of the n-th induced induction heater and the primary power distribution value that the n-th induced induction heater fails to output.

More specifically, at this time, the temperature drop due to the abnormal operation of the n-th induction heater can be expressed as ΔTd = Td1 + Td2 (see FIG. 4). In this case, Td1 represents the temperature at which the primary power distribution value divided by the n-th induction heater is not outputted, and Td2 represents the temperature at which the n-th induction heater does not heat the heating target, And the temperature drop during the heating operation.

The compensation power calculation unit calculates a compensation power value (CV (n)) for compensating for the temperature drop ΔTd due to the abnormal operation of the n-th induction heating.

Next, the total sum of the power values that can be further output by the induction heater from the compensation power value and the (n + 1) th induction heating to the final induction heating is compared to determine whether the heating target can be finally heated to the set temperature (S1400).

Next, when the heating target can be finally heated to the set temperature, the compensation power value is added to the output of the induction heating after the n-th induction heating to calculate the secondary power distribution value, (S1500).

In one embodiment, the step S1400 may calculate the secondary power distribution value by adding the compensation power value to the output of the (n + 1) -th induction heater. Also, in another embodiment, the step S1400 may further include distributing the compensation power value to the induction furnace after the n-th induction heating, wherein the compensating power value is distributed in proportion to the maximum output power of the induction furnace after the n-th induction heating can do.

Next, it is determined whether the secondary power distribution value distributed to the (n + 1) th induction heater exceeds the maximum output power of the (n + 1) th induction heater in operation S1600.

Then, when the secondary power distribution value distributed to the (n + 1) -th induction heater exceeds the maximum output power of the (n + 1) -th induction heater, the excess power is added to the (n + 2) And calculates a difference power distribution value (S1700).

If it is determined in step S1300 that the set temperature is not reached, that is, even if the compensation power value is added to the induction heat after the n-th induction heating, if the heating target can not be heated to the set temperature , And redistributes the primary power distribution value distributed to the induction heater before the n-th induction heating (S1800).

It will be understood by those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof.

It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.

100: induction heating system 110: plural induction heating furnace
120: control unit 130: primary power distribution unit
140: Compensation power calculation unit 150: Secondary power distribution unit
160: tertiary power distribution unit 170: temperature sensor

Claims (14)

Calculating a first power distribution value obtained by dividing a total power required for heating the target object to a set temperature in proportion to a respective maximum output power of the plurality of induction furnaces;
Wherein when the nth induction heater during heating the heating target according to the primary power distribution value fails to output the primary power distribution value, Calculating a compensation power value; And
And adding the compensation power value to the output of the induction heater after the n-th induction heating to heat the heating target. The method according to claim 1,
Wherein the compensating power value is added to the induction furnace after the n-th induction heating and when the heating target can not be heated to the set temperature, Further comprising the step of redistributing the primary power distribution value. ≪ RTI ID = 0.0 > 31. < / RTI > The method according to claim 1,
Wherein the heating step comprises:
And adding the compensation power value to the (n + 1) th induction heating output to calculate a secondary power distribution value. The method of claim 3,
Wherein the heating step comprises:
If the secondary power distribution value distributed to the (n + 1) -th induction heater exceeds the maximum output power of the (n + 1) -th induction heater, the excess power is added to the (n + 2) Further comprising calculating a difference power distribution value between the first and second power distribution values. The method according to claim 1,
Wherein the heating step comprises:
Wherein the compensating power value is distributed to the induction furnace after the n-th induction heating, and is distributed in proportion to the maximum output power of the induction furnace after the n-th induction heating. Distribution method. The method according to claim 1,
Wherein the compensation power value includes an additional power for compensating for a temperature drop of the heated body due to an abnormal operation of the n-th induced induction heater and the primary power distribution value that the n-th induced induction heater fails to output Wherein the power distribution method of the induction heating system. M induction heating elements which are spaced apart from each other at a predetermined interval on the heating body to sequentially heat the heating body; And
And a controller for distributing electric power to the m induction heater for sequentially heating the heating target,
Wherein the control unit redistributes the power of the n-th induced induction heating to induction heating after the n-th induced induction heating when the n-th induced induction heating of the heated body is abnormal. . 8. The method of claim 7,
Wherein the control unit includes a primary power dividing unit that calculates a primary power dividing value obtained by dividing a total power required to heat the heating target to a set temperature in proportion to a maximum output power of each of the m induction heating units ≪ / RTI > 8. The method of claim 7,
The control unit may include a secondary power dividing unit for adding a compensation power value including the power of the (n + 1) -th induction heater to the (n + 1) -th induction heater arranged after the n-th induced induction heater to operate abnormally Characterized by an induction heating system. 10. The method of claim 9,
If the sum of the compensation power value and the primary power distribution value distributed to the (n + 1) -th induction heater exceeds the maximum output power of the (n + 1) -th induction heater, And a tertiary power distributor for distributing the heat to the heater. 8. The method of claim 7,
Wherein the controller divides the compensation power value including the power of the n-th induced induction heater to induction heat from the (n + 1) -th induction heater arranged after the n-th induction heater to the m- And a secondary power distributor for distributing the compensation power value in proportion to a maximum output power of the (n + 1) -th induction heater to the m-th induction heater. 8. The method of claim 7,
Further comprising a temperature sensor installed after the m induction heating to measure the temperature of the heating target and feed back the measured temperature to the control unit. 8. The method of claim 7,
Wherein the control unit controls the temperature of the heated object to be heated to a temperature lower than the predetermined temperature to which the heated object has passed through the mth induction heater, Of the induction heating element of the induction heating element. 8. The method of claim 7,
Wherein the controller controls the power of the n-th induced induction heater that the n-th induction heater does not output to compensate for the loss due to the n-th induction heating that is operating abnormally during heating of the heated object, calculating a compensating power value including an additional power for compensating for the temperature drop of the heating target generated due to failure of the n-th induction heating to heat the heating target in a section where the n-th induction heating passes And a compensating power calculating unit for calculating a compensating power of the induction heating apparatus.

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