KR102169639B1 - Induction heating device and method for controlling thereof - Google Patents

Abstract

The present invention relates to an induction heating device and a control method of the induction heating device. Among the energy generated by the working coil, the smaller the amount of energy transmitted to the container, that is, the lower the efficiency of the container, the greater the size of the resonance current value of the working coil. According to this characteristic, the main controller of the induction heating apparatus according to an embodiment of the present invention compares the resonance current value of the working coil with a reference value to check the driving state of the working coil. As a result of the comparison, when the resonance current value exceeds the reference value, the main controller of the induction heating device according to an embodiment of the present invention calculates the container efficiency index of the container placed on the working coil, and based on the container efficiency index, Adjust the required output value. According to the present invention, there is an advantage that the driving of the working coil is stabilized more quickly regardless of the characteristics of the container.

Description

Induction heating device and control method of induction heating device {INDUCTION HEATING DEVICE AND METHOD FOR CONTROLLING THEREOF}

The present invention relates to an induction heating device and a control method of the induction heating device.

An induction heating device is a device that heats a container by generating an eddy current in a magnetic container by using a magnetic field generated around the working coil when high frequency power of a predetermined size is applied to the working coil.

Since the container can be heated only when an eddy current is formed in the container by the magnetic field by the working coil, the types of containers that can be used in the induction heating device are limited. For example, iron frying pans, iron pots, and enamel pots can be used, but in the case of stainless steel products, the heat power may be weakened depending on the container. Also, containers made of aluminum, heat-resistant glass, copper, or ceramics cannot be used.

A user who wants to heat a container using an induction heating device sets the thermal power to be supplied to the container, that is, the output level. Accordingly, the induction heating device drives the working coil based on the required output value according to the output level requested by the user.

However, energy generated by the working coil cannot be transferred to the container as it is depending on the characteristics of the container to be heated, such as the size, location, and material of the container. Therefore, a difference occurs between the requested output value set by the user and the actual output value of the working coil by driving the working coil.

Energy generated by the working coil but not delivered to the container circulates in the circuit inside the induction heating device. As such, there is a problem in that the temperature of the working coil is increased due to energy circulating in the circuit inside the induction heating device without being transmitted to the container, and the thermal stress of various elements constituting the circuit is increased.

In order to solve the above-described problem, conventionally, a control method of continuously reducing the output value of the working coil by a predetermined size (eg, 100W) is used until the driving of the working coil is stabilized. According to this method, it takes too much time to stabilize the driving of the working coil. For this reason, there is a problem in that the working coil is continuously maintained in a high temperature state, and the possibility of burnout of elements constituting the internal circuit of the induction heating device increases.

The present invention adjusts the output of the working coil in consideration of the container efficiency index representing the ratio of the required output to the working coil and the actual output of the working coil, thereby stabilizing the driving of the working coil more quickly regardless of the characteristics of the container to be heated. An object of the present invention is to provide an induction heating device and a control method of the induction heating device.

In addition, the present invention provides an induction heating device and a control method of an induction heating device capable of quickly reducing the heat generation of the working coil by stabilizing the driving of the working coil more quickly and reducing the possibility of burnout of elements constituting the internal circuit of the induction heating device. It is aimed at.

The objects of the present invention are not limited to the above-mentioned objects, and other objects and advantages of the present invention that are not mentioned can be understood by the following description, and will be more clearly understood by examples of the present invention. In addition, it will be easily understood that the objects and advantages of the present invention can be realized by the means shown in the claims and combinations thereof.

The main controller of the induction heating apparatus according to an embodiment of the present invention drives the working coil based on the output level set by the user and the corresponding required output value. As described above, the actual output value of the working coil appears different from the required output value according to the characteristics of the container placed on the working coil.

When the working coil is driven, the main controller of the induction heating apparatus according to an embodiment of the present invention checks the resonance current value of the working coil and compares the resonance current value with a predetermined reference value.

Among the energy generated by the working coil, the smaller the amount of energy transmitted to the container, that is, the lower the efficiency of the container, the greater the size of the resonance current value of the working coil. According to this characteristic, the main controller of the induction heating apparatus according to an embodiment of the present invention compares the resonance current value of the working coil with a reference value to check the driving state of the working coil.

As a result of the comparison, when the resonance current value exceeds the reference value, the main controller of the induction heating device according to an embodiment of the present invention calculates the container efficiency index of the container placed on the working coil, and based on the container efficiency index, Adjust the required output value.

In the present invention, the container efficiency index is defined as follows [Equation 1].

[Equation 1]

PEI = PR / PC

(Here, PEI is the container efficiency index, PR is the actual output value of the working coil, and PC is the requested output value)

The main controller of the induction heating apparatus according to an embodiment of the present invention calculates an adjustment value using the container efficiency index defined as in [Equation 1], and subtracts the calculated adjustment value from the currently set required output value to obtain a required output value. Reset.

Here, the adjustment value is defined as the following [Equation 2].

[Equation 2]

K = D / PEI

(Where, K is the adjustment value, D is a preset basic adjustment value, PEI is the container efficiency index)

As described above, in the present invention, when the size of the resonant current value of the working coil exceeds the reference value and the driving state of the working coil is unstable, by considering the container efficiency index in adjusting the required output value for the working coil, the driving state of the working coil is faster. Can be stabilized.

On the other hand, the main controller of the induction heating apparatus according to an embodiment of the present invention determines the currently set request output value as the final request output value of the working coil when the resonance current value is less than the reference value. Accordingly, the driving state of the working coil is stabilized, the temperature of the working coil is maintained at an appropriate level, and the possibility of burnout of elements included in the internal circuit of the induction heating device is reduced.

In addition, the main controller of the induction heating apparatus according to an embodiment of the present invention may output the calculated container efficiency index to the outside according to a user's request. For example, the main controller may display the container efficiency index calculated according to the container efficiency index display command input by the user in the operating area of the induction heating device or on a separate display unit. Accordingly, the user can intuitively check the container efficiency index of the container currently in use.

According to the induction heating device and the control method of the induction heating device according to an embodiment of the present invention, by adjusting the output of the working coil in consideration of the container efficiency index representing the ratio of the required output to the working coil and the actual output of the working coil. Regardless of the characteristics of the container to be heated, the driving of the working coil is stabilized more quickly.

In addition, according to the induction heating device and the control method of the induction heating device according to an embodiment of the present invention, the driving of the working coil is stabilized more quickly, so that heat generation of the working coil is rapidly reduced, and the elements constituting the internal circuit of the induction heating device are burned out. It has the advantage of being less likely.

1 is an exploded perspective view of an induction heating device according to an embodiment of the present invention.
2 is a block diagram of an induction heating apparatus according to an embodiment of the present invention.
3 is a flowchart illustrating a method of controlling an induction heating apparatus according to an embodiment of the present invention.
4 is a flowchart illustrating a method of controlling an induction heating device according to another embodiment of the present invention.
5 is a graph showing an output adjustment process of the induction heating device according to the prior art.
6 is a graph showing an output adjustment process of the induction heating apparatus according to the present invention.
7 shows a top plate of an induction heating device according to an embodiment of the present invention.
8 shows a display unit provided in an induction heating device according to another embodiment of the present invention.

The above-described objects, features, and advantages will be described later in detail with reference to the accompanying drawings, and accordingly, one of ordinary skill in the art to which the present invention pertains will be able to easily implement the technical idea of the present invention. In describing the present invention, if it is determined that a detailed description of known technologies related to the present invention may unnecessarily obscure the subject matter of the present invention, a detailed description will be omitted. Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals are used to indicate the same or similar elements.

1 is an exploded perspective view of an induction heating device according to an embodiment of the present invention.

Referring to FIG. 1, the induction heating apparatus 10 according to an embodiment of the present invention includes a case 102 constituting a main body and a cover plate 104 that is coupled to the case 102 to seal the case 102. Include.

The cover plate 104 is coupled to the upper surface of the case 102 to seal the space formed inside the case 102 from the outside. The cover plate 104 includes an upper plate portion 106 on which a container for cooking food can be placed. In an embodiment of the present invention, the upper plate part 106 may be made of a tempered glass material such as ceramic glass, but the material of the upper plate part 106 may vary according to embodiments.

Heating regions 12 and 14 corresponding to the working coil assemblies 108 and 110 are formed on the upper plate 106. Lines or figures corresponding to the heating regions 12 and 14 may be printed or displayed on the upper plate 106 in order to enable the user to clearly recognize the location of the heating regions 12 and 14.

Referring back to FIG. 1, working coil assemblies 108 and 110 for heating the container are disposed in a space formed inside the case 102. In addition, inside the case 102, an interface unit having a function of allowing the user to apply power or adjusting the output of the working coil assemblies 108 and 110 and displaying information related to the induction heating device 10 ( 114) is provided. The interface unit 114 may be formed of a touch panel capable of both inputting and displaying information by touch, but the interface unit 114 having a different structure may be used according to embodiments.

In addition, the upper plate 106 is provided with an operation area 118 disposed at a position corresponding to the interface unit 114. For the user's manipulation, characters or images may be printed in advance on the manipulation area 118. The user can perform a desired operation by touching a specific point on the manipulation area 118 with reference to a preprinted character or image. In addition, information output by the interface unit 114 may be displayed through the upper panel unit 106.

In addition, a power supply unit 112 for supplying power to the working coil assemblies 108 and 110 or the interface unit 114 is disposed in a space formed inside the case 102.

For reference, in the embodiment of FIG. 1, two working coil assemblies 108 and 110 are exemplarily shown inside the case 102, but according to the embodiment, one working coil assembly is disposed inside the case 102 Or two or more working coil assemblies may be arranged.

The working coil assemblies 108 and 110 include a working coil that forms an induction magnetic field using a high-frequency alternating current supplied by the power supply unit 112, and an insulating sheet 116 for protecting the coil from heat generated by the container. Include. Depending on the embodiment, the heat insulating sheet 116 may be omitted.

In addition, although not shown in FIG. 1, a main control unit (not shown) may be disposed in a space formed inside the case 102. The main controller (not shown) receives a user's command through the interface unit 114 and controls the power supply unit 112 according to the user's command to control the driving of the working coil.

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

The rectifier circuit 204 rectifies and outputs the AC power supplied from the input power supply 202. The rectifying circuit 204 may include one or more diodes for rectifying operation, such as bridge diodes and/or inductors. Depending on the embodiment, a converter circuit having a switching element may be used instead of the rectifying circuit 204.

The inductor L1 removes the ripple component remaining in the voltage output from the rectifier circuit 204. Depending on the embodiment, other circuits or elements such as a relay circuit may be used instead of the inductor L1. Further, the smoothing capacitor C3 generates a DC voltage by smoothing the voltage output from the inductor L1.

The inverter circuit 208 converts the DC voltage output from the smoothing capacitor C3 into an AC voltage through a switching operation by the switching elements T1 and T2. The inverter circuit 208 may include one or more switching elements T1 and T2 for performing a switching operation.

The switching elements T1 and T2 may be turned on and off complementarily with each other by switching signals S1 and S2 applied by the inverter controller 24. Turning on and off of the switching elements T1 and T2 is referred to as a switching operation. The corresponding capacitors C1 and C2 are connected in parallel to the switching elements T1 and T2 of the inverter circuit 208, respectively.

The alternating current generated by the inverter circuit 208 is applied to the working coil 210. The working coil 210 causes a resonance phenomenon according to the application of an alternating current, and a resonance current flows through the working coil 210 due to this resonance phenomenon.

The inverter controller 24 outputs switching signals S1 and S2 in accordance with a control signal output from the main controller 20. The number of times the switching elements T1 and T2 are turned on and off per unit time by the switching signals S1 and S2 output by the inverter controller 24, that is, the operating frequency of the inverter circuit 208 is the main controller 20 It can be changed by the control signal output from ).

The input current measurement sensor 222 measures the magnitude of the current input to the rectifier circuit 204 when the working coil 210 is driven, that is, the input current value, and transmits the measured input current value to the main controller 20 do. In addition, the input voltage measurement sensor 224 measures the magnitude of the voltage input to the rectifier circuit 204 when the working coil 210 is driven, that is, the input voltage value, and transmits the measured input voltage value to the main controller 20. Deliver.

The main controller 20 is based on the input current value and input voltage value measured by the input current measurement sensor 222 and the input voltage measurement sensor 224, respectively, of the output actually generated by the working coil 210 being driven. The size, that is, the actual output value can be calculated. For example, the main controller 20 is based on the input current value (I), the input voltage value (V), and the phase difference (θ) between the input current value and the input voltage value according to a predetermined formula (PR = VIcosθ) according to the working coil 210 The actual output value (PR) of) can be calculated.

The resonance current measurement sensor 226 measures the magnitude of the resonance current generated by the working coil 210 when the working coil 210 is driven, that is, the resonance current value of the working coil 210, and the measured resonance current value Is transmitted to the main controller 20.

When the user sets the output level for the container placed in the heating area through the operation area provided in the induction heating device, the main controller 20 determines an output value corresponding to the output level set by the user, that is, a request output value, and Generate a corresponding control signal. As the inverter controller 24 outputs the switching signals S1 and S2 by the control signal applied by the main controller 20, the working coil 210 is driven.

In an embodiment of the present invention, the main controller 20 may adjust the required output value for the working coil 210 until the driving of the working coil 210 is stabilized. Hereinafter, a method in which the main controller 20 adjusts the required output value of the working coil 210 after the user sets the required output value for the working coil 210 will be described.

3 is a flowchart illustrating a method of controlling an induction heating apparatus according to an embodiment of the present invention.

2 and 3, the main controller 20 drives the working coil 210 based on the requested output value set by the user (302).

The main controller 20 checks the resonant current value of the working coil 210 when the working coil 210 is driven (304). The resonance current value of the working coil 210 may be measured by the resonance current measurement sensor 226.

The main controller 20 may compare the measured resonance current value with a predetermined reference value (306), and determine whether to adjust the currently set requested output value according to the comparison result.

If the resonant current value exceeds the reference value, the main controller 20 calculates the container efficiency index of the container placed on the working coil 210 (308). The main controller 200 adjusts the currently set required output value for the working coil 210 based on the calculated container efficiency index (310).

Although not shown in the drawing, if the resonance current value is less than the reference value, the main controller 20 determines the currently set request output value as the final request output value and drives the working coil 210 according to the final request output value.

In addition, although not shown in the drawings, the main controller 20 may output the container efficiency index to the outside according to the user's request. For example, when the user requests the output of the container efficiency index by inputting a specific button in the operation area, the main controller 20 may display the container efficiency index on the operation area or the display unit. Accordingly, the user can intuitively check the efficiency index of the container currently being used.

Hereinafter, a control method of an induction heating device according to the present invention will be described in detail based on another embodiment.

4 is a flowchart illustrating a method of controlling an induction heating device according to another embodiment of the present invention.

2 and 4, the output level of the working coil 210 is set by the user (402). When the user sets the output level of the working coil 210, the required output value of the working coil 210 corresponding to the user set output level is determined. For example, if the user sets the output level of the working coil 210 to 9, the main controller 20 may set the required output value of the working coil 210 to 7000W corresponding to the output level 9.

The main controller 20 drives the working coil 210 by generating a control signal corresponding to the set requested output value (404). When the working coil 210 is driven, a resonance current flows through the working coil 210 due to resonance with a container placed on the working coil 210.

When the working coil 210 is driven, the main controller 20 measures the resonance current value of the working coil 210 through the resonance current measurement sensor 226 (406).

The main controller 20 compares the measured resonant current value with a predetermined reference value (408).

When the resonance current value exceeds the reference value, it means that the driving of the working coil 210 is unstable and some of the energy generated by the working coil 210 cannot be transferred to the container and circulates inside the induction heating device. As such, there is a problem in that the temperature of the working coil is increased due to energy circulating in the circuit inside the induction heating device without being transmitted to the container, and the thermal stress of various elements constituting the circuit is increased. Therefore, when the resonance current value exceeds the reference value, the main controller 20 adjusts the required output value to decrease the currently set required output value until the driving of the working coil 210 is stabilized, that is, the resonance current value decreases below the reference value. Perform.

When the resonant current value exceeds the reference value, the main controller 20 calculates the container efficiency index to adjust the required output value (410). In one embodiment of the present invention, the container efficiency index is defined as follows [Equation 1].

[Equation 1]

PEI = PR / PC

(Here, PEI is the container efficiency index, PR is the actual output value of the working coil, and PC is the current requested output value of the working coil)

For example, when the required output value (PC) for the working coil 210 is set to 7000W and the working coil 210 is driven, the actual output value (PR) of the working coil 210 calculated by the main controller 20 is 1400W On the other hand, the container efficiency index (PEI) of the working coil 210 is determined to be 0.2.

When the container efficiency index is calculated, the main controller 20 calculates an adjustment value using the calculated container efficiency index (412). In one embodiment of the present invention, the adjustment value is defined as shown in [Equation 2] below.

[Equation 2]

K = D / PEI

(Where K is the adjustment value, D is the preset default adjustment value, and PEI is the container efficiency index)

In [Equation 2], the basic adjustment value D may be set in advance. For example, if the basic adjustment value D is set to 200 and the container efficiency index PEI is calculated as 0.2, the adjustment value K is determined as 1000.

When the adjustment value calculation is completed, the main controller 20 resets the requested output value based on the calculated adjustment value (414). The main controller 20 may reset the requested output value by subtracting the previously calculated adjustment value from the currently set request output value. For example, when the currently set request output value is 7000W and the adjustment value is determined to be 1000, the main controller 20 may reset the requested output value to 6000W.

When the requested output value is reset, the main controller 20 drives the working coil 210 again based on the reset request output value (404). Thereafter, the main controller 20 repeatedly performs steps 404 to 414 until the resonant current value of the working coil 210 is lowered below the reference value.

Whenever steps 404 to 414 are performed, the required output value for the working coil 210 decreases, and the actual output value of the working coil 210 increases. For example, when the working coil 210 is driven after the required output value is reset from 7000W to 6000W, the actual output value of the working coil 210 increases to 3000W. Accordingly, the container efficiency index is calculated as 0.5, the adjustment value is determined as 400, and the required output value is reset to 5400W.

As described above, when the resonant current value measured after the working coil 210 is driven while repeatedly adjusted as described above is lower than the reference value, the main controller 20 determines the reset request output value as the final requested output value ( 416), the working coil 210 is driven based on the determined final required output value (418). Accordingly, the container efficiency index of the working coil 210 is increased, and the working coil 210 is stably driven.

5 is a graph showing an output adjustment process of the induction heating device according to the prior art. In addition, Figure 6 is a graph showing the output adjustment process of the induction heating device according to the present invention.

5 and 6, respectively, when the user sets the same container in the heating area of the induction heating device and then sets the required output value of the working coil to 7000W, the working coil is shown until the resonance current value of the working coil falls below the reference value. It represents the time required to adjust the required output value. In this embodiment, when the required output value of the working coil is 4900W or less, the resonance current value of the working coil becomes less than or equal to the reference value, thereby stabilizing the driving of the working coil.

First, as shown in FIG. 5, in the induction heating apparatus according to the prior art, when the resonant current value of the working coil exceeds a predetermined reference value when the working coil is driven, the required output value of the working coil is set to a predetermined basic adjustment value (e.g., 200). ) Repeatedly decreases. That is, the induction heating apparatus according to the prior art compares the resonance current value of the working coil with the reference value while always reducing the required output value by the basic adjustment value without considering the characteristics of the container placed on the working coil at all.

Accordingly, the required output value of the working coil is decreased 11 times in total until the resonant current value of the working coil is less than the reference value, that is, the required output value of the working coil is adjusted to 4800W. Since it takes 6 seconds for the induction heating device to compare the resonance current value with the reference value and adjust the required output value once, it takes 66 seconds for the required output value of the working coil to reach 4800W.

On the other hand, the induction heating device according to the present invention is to reflect the characteristics of the container placed on the working coil in adjusting the required output value of the working coil when the resonance current value of the working coil exceeds a predetermined reference value when the working coil is driven. Calculate the container efficiency index. The induction heating apparatus according to the present invention calculates an adjustment value based on the calculated container efficiency index, and adjusts the required output value of the working coil based on the calculated adjustment value.

For example, as shown in FIG. 6, when the required output value of the working coil is 7000W and the container efficiency index is calculated as 0.2, the adjustment value is determined as 1000. Accordingly, the required output value of the working coil is reset to 6000W.

When driven with the required output value of the working coil set to 6000W, the container efficiency index is calculated as 0.5 and the adjustment value is determined as 400. Accordingly, the required output value of the working coil is reset to 5600W.

When driven with the required output value of the working coil set to 5600W, the container efficiency index is calculated as 0.7 and the adjustment value is determined as 285. Accordingly, the required output value of the working coil is reset to 5315W.

When the working coil is driven with the required output value set to 5315W, the container efficiency index is calculated as 0.8 and the adjustment value is determined as 250. Accordingly, the required output value of the working coil is reset to 5065W.

When driven with the required output value of the working coil set to 5065W, the container efficiency index is calculated as 0.95 and the adjustment value is determined as 210. Accordingly, the required output value of the working coil is reset to 4855W. When the required output value of the working coil is reset to 4855W and driven, the resonance current value of the working coil becomes less than the reference value, so that the working coil can be stably driven.

Accordingly, the required output value of the working coil is reduced five times until the resonant current value of the working coil becomes less than the reference value, that is, the required output value of the working coil is adjusted to 4855W. Since it takes 6 seconds for the induction heating device to compare the resonance current value with the reference value and adjust the required output value once, it takes 30 seconds for the required output value of the working coil to reach 4855W.

As described above, according to the present invention, when the resonance current of the working coil is higher than the reference value and the required output value of the working coil is adjusted, the characteristics of the container placed on the working coil are reflected. That is, the lower the container efficiency index of the container placed on the working coil, the larger the adjustment value is, and the required output value of the working coil decreases more quickly. The faster the required output value of the working coil decreases, the faster the resonance current value of the working coil decreases, and the container efficiency index quickly increases.

Therefore, when the induction heating device according to the present invention is used, the time for stabilizing the driving of the working coil is shortened compared to the prior art, so the heat generated by the working coil is reduced faster than in the prior art, and there is a possibility of burnout of elements constituting the internal circuit of the induction heating device. Lower than

7 shows a top plate of an induction heating device according to an embodiment of the present invention.

Referring to FIG. 7, three heating zones 12, 14, and 16 are disposed on the upper plate 106 of the induction heating apparatus according to an embodiment of the present invention. In addition, an operation region 118 for controlling a heating operation for a container placed on the heating regions 12, 14, 16 is disposed on the upper plate portion 106.

In the operation area 118, a button and a display area for controlling the heating operation for the container are disposed. The user may apply or cut off the power of the induction heating device by touching the power button 702. Whether or not power is applied is indicated by whether or not the power lamp 712 is turned on.

In addition, the user may change the manipulation area 118 to a locked state or unlocked state by touching the lock button 704 for a predetermined period of time. When the manipulation area 118 is locked, inputs to all buttons of the manipulation area 118 are blocked. The locked state of the induction heating device is indicated by whether or not the lock lamp 714 is lit.

In addition, the user may set or cancel the automatic container detection function by touching the automatic detection button 706. When the container automatic detection function is set, when a container is placed in the heating zones 12, 14, 16, whether or not the container is usable is displayed on the heating zone selection window 722. Whether or not the automatic container detection function is set is indicated by whether or not the automatic detection lamp 716 is turned on.

In addition, the user selects the heating area to be heated by touching the heating area selection buttons 722a, 722b, and 722c respectively corresponding to the heating areas 12, 14, 16 in the heating area selection window 722, and sets the output level. By touching the button 708, the output level for the selected heating area can be set.

In addition, the user may set a timer for the selected heating area by touching the timer buttons 710 and 712. The time set by the user using the timer buttons 710 and 712 is displayed on the timer window 730.

A user using the induction heating device having the configuration as shown in FIG. 7 can check the container efficiency index of the container placed in the heating area in real time by touching a specific button.

For example, while the user touches the heating zone selection button 722c and places a container on the selected heating zone 16, the output level is set to 7 while the heating operation is being performed, the user locks the lock button 704 And simultaneously touching the heating region selection button 722c to command output of the container efficiency index of the container placed on the heating region 16.

According to the user's command, the main control unit of the induction heating device calculates the container efficiency index according to [Equation 1], and displays the calculated container efficiency index on the timer window 730 for a predetermined time (eg, 3 seconds). . For example, when the container efficiency index is calculated as 0.2, the main controller may display a number '20' indicating that the current container efficiency index is 20% on the timer window 730.

8 shows a display unit provided in an induction heating device according to another embodiment of the present invention.

As shown in FIG. 8, in the induction heating apparatus according to another embodiment of the present invention, a display unit 80 for displaying information related to the operation of the induction heating apparatus separate from the operation area 118 shown in FIG. 7 It may include. The display unit 80 may be implemented as a display device such as an LCD, but is not limited thereto.

On the display unit 80, heating area icons 82, 84, and 86 corresponding to each of the heating areas 12, 14, and 16 shown in FIG. 7 are displayed. As mentioned above, when the user touches the lock button 704 and the heating zone selection button 722c at the same time or touches a separate button to command the output of the container efficiency index of the container placed on the heating zone 16, the main The controller may display a container efficiency index (40%) of a container placed on the heating region 160 on the icon 86 corresponding to the heating region 16.

As described above, in the induction heating apparatus according to the present invention, when the user commands the output of the container efficiency index of the container placed on the heating area using a predetermined button combination or a separate button, the container efficiency index of the corresponding container through the operation area or display Can be displayed in real time.

As mentioned above, various containers may be used in the induction heating apparatus, but the container efficiency index may vary depending on the characteristics of the container. However, it is impossible for the user to grasp the characteristics of the container only by the outer shape of the container or to identify the characteristics of the container by directly cooking food using the container.

However, according to the present invention, since the container efficiency index of the container currently being heated is displayed in real time according to the user's request, the user can check the characteristics of the container very easily and quickly.

As described above with reference to the drawings illustrated for the present invention, the present invention is not limited by the embodiments and drawings disclosed in the present specification, and various by a person skilled in the art within the scope of the technical idea of the present invention. It is obvious that transformation can be made. In addition, even if not explicitly described and described the effects of the configuration of the present invention while describing the embodiments of the present invention, it is natural that the predictable effects of the configuration should also be recognized.

Claims (12)

Driving the working coil based on the requested output value set by the user;
Checking a resonant current value of the working coil when the working coil is driven;
Comparing the resonance current value with a predetermined reference value;
Calculating a container efficiency index of a container placed on the working coil based on an actual output value of the working coil and a required output value of the working coil when the resonance current value exceeds the reference value;
And adjusting the required output value based on the container efficiency index.
Control method of induction heating device.
The method of claim 1,
The container efficiency index is defined as the following [Equation 1]
Control method of induction heating device.

[Equation 1]
PEI = PR / PC
(Here, PEI is the container efficiency index, PR is the actual output value of the working coil, and PC is the requested output value)
The method of claim 1,
Adjusting the required output value based on the container efficiency index
Calculating an adjustment value using the container efficiency index; And
And resetting the requested output value by subtracting the adjustment value from the requested output value.
Control method of induction heating device.
The method of claim 3,
The adjustment value is defined as the following [Equation 2]
Control method of induction heating device.

[Equation 2]
K = D / PEI
(Where, K is the adjustment value, D is a preset basic adjustment value, PEI is the container efficiency index)
The method of claim 1,
If the resonant current value is less than or equal to the reference value, determining a currently set required output value as a final required output value of the working coil.
Control method of induction heating device.
The method of claim 1,
Further comprising the step of outputting the container efficiency index to the outside according to the user's request
Control method of induction heating device.
An inverter circuit including a plurality of switching elements and applying an alternating current to the working coil;
An inverter controller for applying a switching signal for a switching operation of the plurality of switching elements to the inverter circuit;
And a main controller generating a control signal corresponding to a required output value for the working coil and applying it to the inverter controller,
The main controller is
Drive the working coil based on the requested output value set by the user, check the resonance current value of the working coil when the working coil is driven, compare the resonance current value with a predetermined reference value, and the resonance current value If the reference value is exceeded, the container efficiency index of the container placed on the working coil is calculated based on the actual output value of the working coil and the requested output value of the working coil, and the required output value is adjusted based on the container efficiency index.
Induction heating device.
The method of claim 7,
The container efficiency index is defined as the following [Equation 1]
Induction heating device.

[Equation 1]
PEI = PR / PC
(Here, PEI is the container efficiency index, PR is the actual output value of the working coil, and PC is the requested output value)
The method of claim 7,
The main controller is
Calculating an adjustment value using the container efficiency index, and resetting the requested output value by subtracting the adjustment value from the requested output value.
Induction heating device.
The method of claim 9,
The adjustment value is defined as the following [Equation 2]
Induction heating device.

[Equation 2]
K = D / PEI
(Where, K is the adjustment value, D is a preset basic adjustment value, PEI is the container efficiency index)
The method of claim 7,
The main controller is
If the resonant current value is less than or equal to the reference value, the currently set requested output value is determined as the final requested output value of the working coil
Induction heating device.
The method of claim 7,
The main controller is
Outputting the container efficiency index to the outside according to the user's request
Induction heating device.

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