Clothing treatment apparatus

Abstract

The present application relates to a control method for a clothing treatment apparatus provided with: a drum rotatably provided inside a tub; a coil for generating a magnetic field for inducing an eddy current in the drum; a first control unit for controlling the rotation of the drum; a second control unit for controlling the operation of the coil; a first communication circuit for communicably connecting the first control unit and the second control unit; a relay communicably connected to the first control unit via a second communication circuit and supplying power to the second control unit according to an instruction from the first control unit; a blocking unit for opening the second communication circuit if the temperature of the tub or the temperature of the coil is equal to or higher than a preset reference temperature, and closing the second communication circuit if the temperature of the tub or the temperature of the coil is lower than the reference temperature; and a temperature detection unit for measuring the internal temperature of the tub and transmitting same to the first control unit.

Description

[Technical Field]

[0001] The present application relates to a laundry treating apparatus.[Background]

[0002] A laundry treating apparatus refers to an apparatus capable of washing, drying, or washing and drying laundry (an object-to-be-washed or an object-to-be-dried), and is a concept including a washing machine, a dryer, and a washer-dryer.

[0003] Among the laundry treating apparatuses (the dryers) capable of drying the laundry, there is one that heats a drum through induction heating to remove moisture from the laundry stored inside the drum. That is, among the existing laundry treating apparatuses, there is one that dries the laundry through a coil that induces an eddy current in the drum.

[0004] The laundry treating apparatus that induces the eddy current in the drum through the coil may include a tub in which the drum is rotatably accommodated, a driver that rotates the drum, a first controller that controls the driver, a second controller that controls the coil, a temperature control means that prevents overheating of the coil or overheating inside the tub, and a communication circuit that communicatively connects the first controller with the second controller.

[0005] The laundry treating apparatus having the above-described structure has a disadvantage in that, when a communication failure between the first controller and the second controller occurs, it is difficult to determine whether a cause of the communication failure is an error or a damage of the communication circuit or the overheating of the coil.[Summary][Technical Problem]

[0006] The present application is intended to provide a laundry treating apparatus and a method for controlling the laundry treating apparatus capable of, when a communication failure occurs between a first controller that controls rotation of a drum and a second controller that controls a coil for inducing an eddy current in the drum, determining a cause of the communication failure.[Technical Solutions]

[0007] The present application relates to a method for controlling a laundry treating apparatus including: a drum rotatably disposed inside a tub; a coil that generates a magnetic field inducing an eddy current in the drum; a first controller that controls rotation of the drum; a second controller that controls operation of the coil; a first communication circuit communicatively connecting the first controller with the second controller; a relay that is communicatively connected to the first controller through a second communication circuit and supplies power to the second controller in response to an instruction of the first controller; an interrupter that opens the second communication circuit when a temperature of the tub or a temperature of the coil is equal to or higher than a preset reference temperature, and closes the second communication circuit when the temperature of the tub or the temperature of the coil is lower than the reference temperature; and a temperature sensor that measures the temperature inside the tub and transmits the measured temperature to the first controller.

[0008] The method includes a drying step of rotating the drum at a first number of rotations and heating the drum through the coil; a rotation step of rotating the drum at a second number of rotations when a communication failure between the first controller and the second controller occurs through the first communication circuit during the drying step; and a measuring step of measuring the temperature inside the tub for a preset measurement duration during the rotation step, and whether the second communication circuit is opened by a failure of the first communication circuit and by the interrupter is determinable based on whether the temperature inside the tub has increased during the rotation step.

[0009] The method may further include notifying the failure of the first communication circuit when the temperature inside the tub has increased during the rotation step.

[0010] The method may further include determining whether the communication failure between the first controller and the second controller has been resolved after a preset reference time period has elapsed, when the temperature inside the tub has decreased during the rotation step.

[0011] The method may further include notifying a failure of one of the interrupter, the relay, and the second controller when the communication failure between the first controller and the second controller has not been resolved after the reference time period has elapsed.

[0012] The method may further include notifying a failure of one of the relay and the second controller when the communication failure between the first controller and the second controller has not been resolved after the reference time period has elapsed.

[0013] The method may further include determining whether the number of times the interrupter has operated is equal to or greater than a preset reference number of times when the communication failure between the first controller and the second controller has been resolved after the reference time period has elapsed, and notifying a failure of the interrupter when the number of times the interrupter has operated is equal to or greater than the preset reference number of times.

[0014] The second number of rotations may be set to be greater than the first number of rotations.

[0015] The present application provides a laundry treating apparatus including a drum rotatably disposed inside a tub, a coil that generates a magnetic field inducing an eddy current in the drum, a first controller that controls rotation of the drum, an inverter including a second controller that controls operation of the coil and a relay that supplies power to the second controller in response to an instruction of the first controller, a first communication circuit that communicatively connects the first controller with the second controller, a second communication circuit that communicatively connects the first controller with the relay, and an interrupter that opens the second communication circuit when a temperature of the tub or a temperature of the coil is equal to or higher than a preset reference temperature, and closes the second communication circuit when the temperature of the tub or the temperature of the coil is lower than the reference temperature.

[0016] The interrupter may include a first interrupter that opens the second communication circuit when the temperature inside the tub is equal to or higher than a first reference temperature, and closes the second communication circuit when the temperature inside the tub is lower than the first reference temperature, and a second interrupter that opens the second communication circuit when the temperature of the coil is equal to or higher than a second reference temperature, and closes the second communication circuit when the temperature of the coil is lower than the second reference temperature.

[0017] The laundry treating apparatus may further include an inverter power circuit that supplies power to the relay, and a power cut-off that opens the inverter power circuit when the temperature inside the tub is equal to or higher than a power cut-off temperature set to be higher than the first reference temperature.

[0018] The laundry treating apparatus may further include a temperature sensor that measures the temperature inside the tub and transmits the measured temperature to the first controller.

[0019] The temperature sensor may transmit two or more temperatures measured with a time interval to the first controller when the first controller and the second controller are not able to be in communication with each other through the first communication circuit.[Advantageous Effects]

[0020] The present application provides the laundry treating apparatus and the method for controlling the laundry treating apparatus capable of, when the communication failure occurs between the first controller that controls the rotation of the drum and the second controller that controls the coil for inducing the eddy current in the drum, determining the cause of the communication failure.[Brief Description of the Drawings]

[0021] FIGS. 1 and 2 show an example of a laundry treating apparatus. FIG. 3 shows an example of a heater. FIG. 4 shows an example of a heater, a first controller, and a second controller. FIG. 5 shows an example of a method for controlling a laundry treating apparatus. [Best Mode]

[0022] Hereinafter, embodiments of a laundry treating apparatus and a control method thereof will be described in detail with reference to the accompanying drawings. A configuration or the control method of the apparatus to be described below is only for describing the embodiments of the laundry treating apparatus and is not intended to limit the scope of the present application, and reference numerals identically used throughout the present document denote the same components.

[0023] As shown in FIG. 1, a laundry treating apparatus 100 may include a cabinet 1 having an inlet 11 defined therein, a tub 2 that is disposed inside the cabinet 1 and stores water therein, and a drum 3 that is rotatably disposed inside the tub and accommodates an object-to-be-treated (hereinafter, referred to as 'laundry') therein.

[0024] The inlet 11 may be defined in a front surface of the cabinet 1 and may be closed by a door 12 pivotably coupled to the cabinet 1.

[0025] A control panel 13 may be disposed on the cabinet 1. FIG. 1 shows a case in which the control panel 13 is disposed on the front surface of the cabinet 1 so as to be positioned above the inlet 11 as an example.

[0026] An input unit 131 and a display 132 may be disposed on the control panel 13. The input unit 131 may be equipped as a means for receiving a control command from a user, and the display 132 may be equipped as a means for displaying the control commands selectable by the user and displaying execution information of the control command selected by the user.

[0027] As shown in FIG. 2, the tub 2 may be equipped as a tub body 21 that is disposed inside the cabinet 1 and provides a space in which water is stored. The tub body 21 may be formed as a cylinder having a hollow defined inside, and a tub inlet 22 may be defined in one surface of the cylinder.

[0028] The tub body 21 may be fixed to the inside of the cabinet 1 through a support. FIG. 2 shows a case in which the support is composed of a spring 24 connecting an upper portion of a circumferential surface of the tub body 21 to the cabinet 1, and a damper 25 connecting a lower portion of the circumferential surface of the tub body 21 to the cabinet 1 as an example.

[0029] The tub inlet 22 may be connected to the inlet 11 through a gasket 23. To prevent water stored in the tub body 21 from leaking into the cabinet 1, the gasket 23 may be equipped as a tube connecting the inlet 11 with the tub inlet 22. In addition, the gasket 23 may be made of an elastic material such as rubber to minimize transmission of vibration of the tub body 21 to the cabinet 1.

[0030] The laundry treating apparatus 100 may further include a temperature sensor 27 that measures a temperature inside the tub body 21. FIG. 2 shows a case in which the temperature sensor 27 is fixed to an upper space of the circumferential surface of the tub body 21 and senses a temperature of a space between the tub body 21 and a drum body 31 as an example.

[0031] The drum 3 may include the drum body 31 that is disposed inside the tub body 21 and provides a space in which the laundry is stored.

[0032] The drum body 31 may be formed as a cylinder having a hollow defined inside, and a drum inlet 32 may be defined in one surface (a surface directed in a direction in which the tub inlet is located) of the cylinder. A material of the drum body 31 is preferably a conductor.

[0033] A communication hole 33 allowing the inside of the drum body 31 to be in communication with the inside of the tub body 21 may be defined in a circumferential surface or the like of the drum body 31, and a lifter that lifts the laundry inside the drum body 31 when the drum body 31 rotates may be disposed on the circumferential surface of the drum body 31.

[0034] The drum body 31 may be rotatably fixed to the tub body 21 through a driver 4.

[0035] The driver 4 may include a stator 41 that is fixed to a rear surface of the tub body 21 and forms a rotating field when a current is supplied, a rotor 42 positioned outside the tub body 21 so as to be rotated by the rotating field, and a rotation shaft 43 extending through the rear surface of the tub body 21 to connect the rotor 42 with a rear surface of the drum body 31.

[0036] The tub body 21 may receive water through a water supply 5, and water stored in the tub body 21 may be discharged to the outside of the tub body 21 through a water discharger 6.

[0037] The water supply 5 may include a water supply pipe 52 connecting a water supply source 51 to the tub body 21, and a water supply valve 53 that controls opening and closing of the water supply pipe 52.

[0038] The water discharger 6 may include a pump 61, a first drain pipe 62 connecting the tub body 21 to the pump 61, and a second drain pipe 63 that guides water discharged from the pump 61 to the outside of the cabinet 1.

[0039] The laundry treating apparatus 100 may further include a supply 7 that supplies a detergent to the tub body 21. The supply 7 may include a drawer that is extendable from a front surface of the cabinet 1, and a storage space defined in the drawer to store the detergent therein.

[0040] FIG. 2 shows a case in which the storage space connects the water supply pipe 52 with the tub body 21 as an example. In this case, the water supply pipe 52 may be composed of a first water supply pipe 521 that guides water supplied from the water supply source 51 to the storage space, and a second water supply pipe 522 that guides the detergent and water discharged from the storage space to the tub body 21.

[0041] The laundry treating apparatus 100 may further include a heater 8 that heats the drum body 31.

[0042] The heater 8 is a means for heating the drum body 21 by forming an eddy current in the drum body 21 through electromagnetic induction. An induction heater may be an example of the heater 8.

[0043] The heater 8 is preferably disposed in a space located above a horizontal line (a horizontal line passing through a center of rotation of the drum body) H passing through a center of the tub body on the circumferential surface of the tub body 21. This is because absence of water between the heater 8 and the drum body 31 is advantageous in heating the drum body 31.

[0044] As shown in FIG. 3, the heater 8 may include a housing 81 fixed to the upper space of the tub body 21, and a coil 82 that is fixed to the inside of the housing 81 and forms a magnetic field inducing the eddy current in the drum body 31.

[0045] The housing 81 may include a body 811 that is fixed to the tub body 21 and provides a space in which the coil 82 is seated, and a cover 812 that is fixed to the body 811 and prevents the coil 82 from being exposed to the outside of the housing.

[0046] As shown in FIG. 4, the laundry treating apparatus 100 may include a first controller 91 and an inverter 92.

[0047] The first controller 91 may control at least one of the water supply valve 53, the pump 61, the temperature sensor 27, the input unit 131, the display 132, and the stator 41, and the inverter 92 may control the heater 8.

[0048] The inverter 92, as a device for supplying an alternating current to the coil 82 of the heater, may include a second controller 922 that controls the coil 82 of the heater 8, and a relay 921 that controls an operation of the second controller 922 in response to a control signal of the first controller 91.

[0049] The laundry treating apparatus 100 receives power from a power source S. The first controller 91 may receive power through a first controller power circuit 95, and the inverter 92 may receive power through an inverter power circuit 97. The temperature sensor 27 may receive power through a sensor power circuit 96, and opening and closing of the sensor power circuit 96 may be controlled in response to a control signal of the first controller 91.

[0050] In one example, the laundry treating apparatus 100 may include a first communication circuit 93 that communicatively connects the first controller 91 with the second controller 922, and a second communication circuit 94 that communicatively connects the first controller 91 with the relay 921. In this case, the relay 921 may control the inverter power circuit 97 such that power is supplied to the second controller 922 when receiving a control command of the first controller 91 through the second communication circuit 94.

[0051] The laundry treating apparatus 100 having the above-described heater 8 is able to stably operate the laundry treating apparatus 100 only when overheating of the coil 82 is prevented and overheating of the drum body 31 is prevented.

[0052] To stably control the laundry treating apparatus 100, an interrupter may be disposed in the second communication circuit 94. The interrupter 941 and 942 is a means for opening the second communication circuit 94 when the temperature inside the tub body 21 or a temperature of the coil 82 is equal to or higher than a preset reference temperature, and closing the second communication circuit 94 when the temperature is lower than the reference temperature. The closed state of the second communication circuit 94 refers to a state in which the first controller 91 and the relay 921 are able to be in communication with each other, and the opened state of the second communication circuit 94 refers to a state in which the first controller 91 and the relay 921 are not able to be in communication with each other.

[0053] FIG. 4 shows a case in which the interrupter is composed of a first interrupter 941 that controls the opening and closing of the second communication circuit based on the temperature inside the tub body 21, and a second interrupter 942 that controls the opening and closing of the second communication circuit based on the temperature of the coil 82 as an example.

[0054] The first interrupter 941 may be fixed to the circumferential surface of the tub body 21 and measure the temperature of the space between the tub body 21 and the drum body 31, and the second interrupter 942 may be fixed to the cover 812 of the heater and measure the temperature of the coil 82.

[0055] A thermostat that opens the second communication circuit 94 when the temperature inside the tub body 21 is equal to or higher than a preset first reference temperature and closes the second communication circuit 94 when the temperature inside the tub body 21 is lower than the first reference temperature may be one example of the first interrupter 941.

[0056] A thermostat that opens the second communication circuit 94 when the temperature of the coil 82 is equal to or higher than a preset second reference temperature and closes the second communication circuit 94 when the temperature of the coil 82 is lower than the second reference temperature may be one example of the second interrupter 942.

[0057] The first interrupter 941 and the second interrupter 942 may be equipped as return-type thermostats capable of closing the second communication circuit 94 in the opened state without separate control when the temperature inside the tub and the temperature of the coil are lower than the reference temperatures set in the respective interrupters.

[0058] In the laundry treating apparatus 100 having the above-described interrupters 941 and 942, when the coil 82 is overheated or the drum body 31 is overheated (the temperature inside the tub body exceeds the first reference temperature), the first controller 91 is not able to transmit the control command to the relay 921. When the relay 921 does not receive the control command from the first controller 91, the second controller 922 is not able to receive power. Accordingly, the laundry treating apparatus 100 may minimize the overheating of the coil and the drum body through the interrupters.

[0059] Unlike the second communication circuit 94, the first communication circuit 93 is preferably equipped as a communication circuit connecting the first controller 91 with the second controller 922 without the above-described interrupters.

[0060] Furthermore, to stably operate the laundry treating apparatus 100, a power cut-off 974 may be disposed in the inverter power circuit 97. The power cut-off 974 may be equipped as a thermostat that opens the inverter power circuit 97 when the temperature inside the tub body 21 reaches a preset power cut-off temperature. The power cut-off temperature is set to be higher than the first reference temperature.

[0061] The power cut-off 974 may be equipped as a non-return-type thermostat that connects the inverter power circuit 97 (closes the inverter power circuit) only when a process of cutting off power of the laundry treating apparatus 100 and then supplying power thereto again is performed, even when the temperature inside the tub body 21 becomes lower than the power cut-off temperature.

[0062] The power cut-off 974 may be fixed to the circumferential surface of the tub body 21. In this case, the inverter power circuit 97 may include a first power line 971 connecting a power source S with the power cut-off 974, a second power line 972 connecting the power cut-off 974 with the relay 921, and a third power line 973 connecting the relay 921 with the second controller 922.

[0063] The laundry treating apparatus 100 having the above-described structure is able to prevent the overheating of the drum body and the coil through the interrupters and power cut-off 941, 942, and 974, but when a communication failure between the first controller 91 and the second controller 922 occurs, it is difficult to determine whether the communication failure is caused by the first communication circuit 93 or the second communication circuit 94. This is because the communication failure between the first controller 91 and the second controller 922 may occur because of an operation error (a circuit damage or the like) of the first communication circuit 93, but may also occur because of an operation error (a case in which the second communication circuit is opened, a case in which the second communication circuit is damaged, or the like) of the second communication circuit 94.

[0064] FIG. 5 shows an example of a control method capable of solving the above-described problem, and the control method includes a drying step (S10).

[0065] The drying step (S10) may include a step of rotating the drum body 31 at a preset first number of rotations by controlling the driver 4, and a step of heating the drum body 31 by operating the heater 8.

[0066] The drying step (S10) may further include a cooling water supply step of supplying water to the circumferential surface of the tub body 21, the rear surface of the tub body 21, or a circumferential surface of the gasket 23 through the water supply 5 to cool air that has completed heat exchange with the laundry.

[0067] The control method determines (S15) whether the first controller 91 and the second controller 922 are able to be in communication with each other while the drying step (S10) is in progress. When the communication between the first controller 91 and the second controller 922 is smooth, the drying step is ended when a dryness of the laundry reaches a preset target dryness (S51). Whether or not the dryness of the laundry has reached the target dryness may be determined by whether an execution duration of the drying step has reached a set duration.

[0068] On the other hand, when it is determined (S15) that the first controller 91 and the second controller 922 are not able to be in communication with each other during the drying step (S10), the control method performs a rotation step (S20) of rotating the drum body 31 at a high speed (a second number of rotations).

[0069] Because the rotation step (S20) is a step of forming an airflow inside the tub body 31 by rotating the drum body 31 at the high speed, it is preferable that the second number of rotations is set to be higher than the first number of rotations.

[0070] In the control method, a measuring step (S30) of measuring a temperature change inside the tub body 21 is performed during the rotation step (S20). The measuring step (S30) may be a step in which the temperature sensor 27 measures the temperature inside the tub body 21 for a preset measurement duration and transmits the temperature to the first controller 91.

[0071] The temperature sensor 27 is fixed to the upper space of the circumferential surface of the tub body 21. Further, the airflow moving along the circumferential surface of the tub body will be formed inside the tub body 21 during the rotation step (S20). Therefore, when the measuring step (S30) is executed during the rotation step (S20), the temperature change inside the tub body will be detected more quickly. When the measuring step (S30) is completed, the control method ends the rotation of the drum body 31 (S31).

[0072] When two or more temperatures measured with a time interval are measured through the measuring step (S30), the control method proceeds to a step (S32) of determining the temperature change inside the tub body 21. The determination step (S32) may be a step of determining whether the temperature inside the tub body 21 has increased or decreased through an operation of data transmitted from the temperature sensor 27 by the first controller 91.

[0073] The control method may determine whether the communication failure is caused by a failure of the first communication circuit 93 or by the interrupters 941 and 942 based on whether the temperature inside the tub body 21 has increased, which is identified through the determination step (S32).

[0074] That is, when it is determined through the determination step (S32) that the temperature inside the tub body 21 has decreased, the control method may determine that the second communication circuit 94 is opened by the first interrupter 941 or the second interrupter 942. This is because the decrease in the temperature inside the tub body 21 in the situation in which the communication failure has occurred means that the heater 8 is not in operation. This indicates that the relay 921 does not receive the control command from the first controller 91 and thus power is not supplied to the coil 82.

[0075] When it is determined that the communication failure between the controllers 91 and 922 is because of the interrupters 941 and 942, the control method proceeds to a waiting step (S40) of waiting for a preset reference time period.

[0076] After the reference time period has elapsed (after completion of the waiting step), the control method proceeds to a step (S41) of determining whether the communication failure has been resolved. The step (S41) of determining whether the communication failure has been resolved may include determining that the communication failure has been resolved when the first controller 91 receives a control signal transmitted from the second controller 922.

[0077] When it is determined that the communication failure has been resolved, the control method may proceed to a step (S42) of determining whether the number of times the communication failure has occurred by the interrupters 941 and 942 is smaller than a reference number of times.

[0078] When the number of times that communication failure has occurred by the interrupters 941 and 942 is equal to or greater than the reference number of times, the control method proceeds to a notification step (S421) of notifying a user of a failure of the interrupter through the display 132. However, when the number of times that communication failure has occurred by the interrupters 941 and 942 is smaller than the reference number of times, the control method proceeds to a re-execution step (S50) of resuming the stopped drying step (S10).

[0079] The re-execution step (S50) may include a step of rotating the drum body 31 at the first number of rotations and a step of heating the drum body by operating the heater 8 while the drum body rotates. The re-execution step (S50) ends when the dryness of the laundry reaches the preset target dryness (S51).

[0080] On the other hand, when the communication failure has not been resolved even after the completion of the waiting step (S40), the control method proceeds to a notification step (S411) of notifying the user of a failure of the inverter 92 or a failure of the second communication circuit 94 through the display 132. Because there is a high possibility that the communication failure is caused by a problem of the inverter 92 or the second communication circuit 94 itself when the interrupters 941 and 942 are in a normal operation state.

[0081] Unlike the above description, when it is determined in the determination step (S32) that the temperature inside the tub body 21 has increased, the control method may determine that the first communication circuit 93 has failed.

[0082] This is because the increase in the temperature inside the tub body 21 in the situation in which the communication failure has occurred means that the heater 8 is operating. This indicates that the relay 921 is normally receiving the control command from the first controller 91, the second controller 922 is normally receiving power through the relay 921, and the coil 82 is normally operating in response to the control signal of the second controller 922.

[0083] When it is determined that the first communication circuit 93 has failed (S32), the control method may proceed to a notification step (S321) of notifying the user of the failure of the first communication circuit 93 through the display 132, and a step (S322) of ending the operation of the heater 8.

[0084] Because the above-described structure or control method is the description of the embodiments of the laundry treating apparatus and the method for controlling the laundry treating apparatus, the scope of the present application is not limited to the above-described structure or control method.

Claims

1. A method for controlling a laundry treating apparatus including: a drum rotatably disposed inside a tub; a coil configured to generate a magnetic field inducing an eddy current in the drum; a first controller configured to control rotation of the drum; a second controller configured to control operation of the coil; a first communication circuit communicatively connecting the first controller with the second controller; a relay communicatively connected to the first controller through a second communication circuit and configured to supply power to the second controller in response to an instruction of the first controller; an interrupter configured to open the second communication circuit when a temperature of the tub or a temperature of the coil is equal to or higher than a preset reference temperature, and close the second communication circuit when the temperature of the tub or the temperature of the coil is lower than the reference temperature; and a temperature sensor configured to measure the temperature inside the tub and transmit the measured temperature to the first controller, the method comprising: a drying step of rotating the drum at a first number of rotations and heating the drum through the coil; a rotation step of rotating the drum at a second number of rotations when a communication failure between the first controller and the second controller occurs through the first communication circuit during the drying step; and a measuring step of measuring the temperature inside the tub for a preset measurement duration during the rotation step, wherein whether the second communication circuit is opened by a failure of the first communication circuit and by the interrupter is determinable based on whether the temperature inside the tub has increased during the rotation step.

2. The method of claim 1, further comprising notifying the failure of the first communication circuit when the temperature inside the tub has increased during the rotation step.

3. The method of claim 1, further comprising determining whether the communication failure between the first controller and the second controller has been resolved after a preset reference time period has elapsed, when the temperature inside the tub has decreased during the rotation step.

4. The method of claim 3, further comprising notifying a failure of one of the interrupter, the relay, and the second controller when the communication failure between the first controller and the second controller has not been resolved after the reference time period has elapsed.

5. The method of claim 3, further comprising notifying a failure of one of the relay and the second controller when the communication failure between the first controller and the second controller has not been resolved after the reference time period has elapsed.

6. The method of claim 5, further comprising: determining whether the number of times the interrupter has operated is equal to or greater than a preset reference number of times when the communication failure between the first controller and the second controller has been resolved after the reference time period has elapsed; and notifying a failure of the interrupter when the number of times the interrupter has operated is equal to or greater than the preset reference number of times.

7. The method of claim 1, wherein the second number of rotations is set to be greater than the first number of rotations.

8. A laundry treating apparatus comprising: a drum rotatably disposed inside a tub; a coil configured to generate a magnetic field inducing an eddy current in the drum; a first controller configured to control rotation of the drum; a second controller configured to control operation of the coil; a relay configured to supply power to the second controller in response to an instruction of the first controller; a first communication circuit configured to communicatively connect the first controller with the second controller; a second communication circuit configured to communicatively connect the first controller with the relay; and an interrupter configured to open the second communication circuit when a temperature of the tub or a temperature of the coil is equal to or higher than a preset reference temperature, and close the second communication circuit when the temperature of the tub or the temperature of the coil is lower than the reference temperature.

9. The laundry treating apparatus of claim 8, wherein the interrupter includes: a first interrupter configured to open the second communication circuit when the temperature inside the tub is equal to or higher than a first reference temperature, and close the second communication circuit when the temperature inside the tub is lower than the first reference temperature; and a second interrupter configured to open the second communication circuit when the temperature of the coil is equal to or higher than a second reference temperature, and close the second communication circuit when the temperature of the coil is lower than the second reference temperature.

10. The laundry treating apparatus of claim 9, further comprising: an inverter power circuit configured to supply power to the relay; and a power cut-off configured to open the inverter power circuit when the temperature inside the tub is equal to or higher than a power cut-off temperature set to be higher than the first reference temperature.

11. The laundry treating apparatus of one of claims 8 to 10, further comprising a temperature sensor configured to measure the temperature inside the tub and transmit the measured temperature to the first controller.

12. The laundry treating apparatus of claim 11, wherein the temperature sensor is configured to transmit two or more temperatures measured with a time interval to the first controller when the first controller and the second controller are not able to be in communication with each other through the first communication circuit.

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