KR101344544B1 - Method for controlling washing machine - Google Patents

Abstract

The present invention relates to a washing machine, and more particularly, to a method for preventing intellectual power module (IPM) burnout by overload of a motor in a washing or rinsing process.

In the washing machine control method according to the present invention, a washing or rinsing command is input, and the motor is driven according to the input command, controlling the motor driving to the basic IPM DUTY, and a switching unit (IPM). ) Sensing the temperature, controlling the IP duty to be changed after the motor is paused if the detected switching unit (IPM) temperature exceeds the first set temperature, and the temperature of the switching unit is set to the second set temperature. If exceeded, the step of controlling the basic IP duty after the motor is paused again is further included.

According to the control method of the washing machine according to the present invention, when the temperature of the IPM is increased due to the overload of the motor, the operation of the motor is stopped for a predetermined time, thereby preventing the burnout phenomenon of the IPM due to overheating.

Switch, Wash, Rinse

Description

Method for controlling washing machine

1 is a block diagram showing a motor drive system of a washing machine according to the spirit of the present invention.

2 is a flowchart showing a control method of a washing machine according to the spirit of the present invention.

<Description of the symbols for the main parts of the drawings>

10: motor 20: Hall sensor

30: speed sensing circuit 40: heat sink

50: temperature sensor 60: temperature sensing circuit

70: control unit 90: switching unit (IPM)

The present invention relates to a washing machine, and more particularly, to a method for preventing intellectual power module (IPM) burnout by overload of a motor in a washing or rinsing process.

In general, a washing machine includes a drum into which laundry is put, a tub surrounding the drum and washing water stored therein, a motor for rotating the drum, and the motor.

In detail, when washing is started, the drum is rotated by supplying a driving voltage to the motor under the control of the IPM. In addition, in the washing and rinsing process, the motor rotates forward and backward at low speed, and in the dehydration process, the motor rotates forward and at high speed.

More specifically, in the washing or rinsing process, a high current is applied to the motor because the starting torque of the motor must be large for the drum rotation due to the load of the wet laundry put into the drum. As a result, the temperature of the IPM increases.

In the conventional washing machine, the duty of the IPM is controlled during washing or rinsing so that the motor is driven for about 21 seconds and then stopped for 6 seconds. Then, when the temperature of the IPM rises above the first set temperature, the duty of the IPM is changed so that the motor is turned on for about 4 seconds and then turned off for 10 seconds. Then, the temperature of the IPM is measured again and programmed to turn off the motor power when the temperature reaches or exceeds the second set temperature.

Here, when the temperature of the IPM is overheated above the set temperature, when the power of the motor is turned off, a problem that the consumer is mistaken for the failure of the washing machine occurs. In addition, when the temperature of the IPM is overheated above the first set temperature, the risk of IPM burnout is very high since the IPM duty is continuously changed without stopping the motor.

The present invention has been proposed to solve the above problems, and an object of the present invention is to provide a control method of a washing machine for preventing a phenomenon in which IPM is overheated over a set temperature or burned out or the operation of the washing machine is stopped.

In the control method of the washing machine according to the present invention for achieving the above object, a washing or rinsing command is input, and the motor is driven according to the input command, and the motor driving is controlled by the basic IPM duty. Detecting the temperature of the switching unit (IPM); controlling the changed IP duty after the motor is paused when the detected switching unit (IPM) temperature exceeds the first set temperature; and If the temperature exceeds the second set temperature, controlling the default IP duty after the motor is paused again is included.

In another aspect, a control method of a washing machine according to the present invention includes the steps of inputting a washing or rinsing command; The motor is controlled to the basic IPM DUTY according to the input command to repeat the forward and reverse rotation; Sensing a switching unit (IPM) temperature; When the detected switching unit (IPM) temperature exceeds the first set temperature, the motor is paused and controlled by the changed IP duty; and when the second set temperature is exceeded in the process controlled by the changed IP duty, the motor is After pausing again, the step of controlling the basic IP duty is repeated.

By the above control method, not only the IPM burnout phenomenon due to the overload of the motor is prevented, but also the risk of fire occurrence in the washing machine is removed.

Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings. It should be understood, however, that there is no intention to limit the scope of the present invention to the embodiment shown, and that other embodiments falling within the scope of the present invention may be easily devised by adding, Can be proposed.

1 is a block diagram showing a motor driving system of a washing machine according to the spirit of the present invention.

Referring to FIG. 1, a motor driving system of a washing machine according to the present invention includes a motor 10, a switching unit (IPM: Intelligent Power Module) 90 driven by being supplied with the DC power, and the switching unit 90. A heat sink 40 that emits heat generated from the heat sink, a temperature sensor 50 mounted at a predetermined position of the heat sink 40 to sense a temperature of the switching unit 90, and the motor 10. In order to control the driving of the motor 10 according to the temperature of the Hall sensor 20 mounted on the motor 10 and the switching unit 90 sensed by the temperature sensor 50 to detect the rotational speed. A control unit 70 for outputting a control signal and a power device driver 80 for controlling the driving of the motor 10 in accordance with the control signal output from the control unit 70 is included.

Referring to the operation of the motor drive system constituting the above configuration as follows.

First, DC power is supplied to the switching unit 90, and the control element 70 outputs a control signal from the power device driving circuit 80 to the switching unit 90 according to the control signal of the control unit 70. The motor 10 is driven by the output control signal. Here, the motor 10 is preferably a BLDC motor capable of speed control.

On the other hand, the Hall sensor 20 mounted on the motor 10 detects the rotational speed of the motor 10 and outputs it to the speed detection circuit 30, the speed detection circuit 30 detects the detection result Transmission to the control unit 70.

In addition, the temperature sensor 50 mounted on the heat sink 40 measures the temperature of the switching unit 90 and transmits the temperature to the temperature sensing circuit 60, and the temperature sensing circuit 60 detects the result. The value is transmitted to the controller 70.

In detail, when the power is supplied and the washing stroke or the rinsing stroke is performed, the motor 10 is inverted in left and right directions, thereby increasing the temperature of the motor 10. When the pulsator or washing tank connected to the motor 10 is restrained due to an external factor or proceeds for a long time, the current value of the motor 10 is increased to increase the current value flowing through the switching unit 90. . As a result, the temperature of the switching unit 90 rises together.

Therefore, the temperature sensor 50 mounted on the heat sink 40 detects this and transmits it to the controller 70 through the temperature sensing circuit 60. The controller 70 receives the input and determines whether the temperature exceeds the set temperature to control the operation of the motor 10.

2 is a flowchart illustrating a control method of a washing machine according to the spirit of the present invention.

Referring to FIG. 2, first, a user inputs a washing or rinsing command (S101). Then, the motor is driven according to the input command (S102).

In detail, when the driving of the motor is started according to the input command, the motor is controlled to the basic IPM duty. In other words, the motor rotates forward and backward for 21 seconds and stops for 6 seconds.

On the other hand, the temperature sensor 50 detects the temperature of the switching unit 90 in real time (S104), the sensed temperature is transmitted to the controller 70. In addition, the controller 70 determines whether the detected temperature is higher than the first set temperature T1 (S105). Preferably, the first set temperature T1 is suitable for 85 degrees Celsius.

In detail, when the detected temperature is less than or equal to the first set temperature T1, it is determined whether the stroke according to the input command is completed (S115), and when the stroke is completed, the washing or rinsing stroke is finished. However, if it is determined that the stroke is being performed, the motor repeats the basic IPM duty control process.

If the detected temperature is higher than the first set temperature T1, the motor is temporarily stopped by the controller 70, and drainage and water supply are performed (S106). Preferably, the motor is stopped for 1 minute in the EOIR, and drainage and water supply are performed while the motor is stopped. The drainage may be partially or completely drained.

Conventionally, even if the temperature of the switching unit 90 is overheated to a predetermined temperature or more, since the IPM duty is changed to continue operation without stopping the motor, there is a problem that the overheating phenomenon of the switching unit cannot be prevented. However, in the case of the present invention, as described above, when the temperature of the switching unit 90 overheats a predetermined temperature or more, the motor has a temporary rest period, so that the heat of the switching unit 90 to release the switching unit 90 ) Burnout can be prevented.

On the other hand, after the motor is suspended, the stroke is continued again to operate the motor. In this case, the operation of the motor is controlled by changing the basic IPM duty (S107). In this case, the changed IPM duty is such that the motor operates for 4 seconds and stops for 10 seconds, thereby preventing the switching unit 90 from overheating. That is, the stop time is longer than the operation time of the motor, so that the overcurrent does not flow through the switching unit 90.

In detail, in the process of operating the motor through the changed IPM duty control, the temperature sensor 50 continuously detects the temperature of the switching unit 90. The detected temperature is transmitted to the controller 70, and the controller 70 determines whether the sensed temperature is overheated above the first set temperature T1 (S108).

In more detail, when it is determined that the sensed temperature exceeds the first set temperature T1, it is again determined whether the sensed temperature is greater than or equal to the second set temperature T2 (S109). The second set temperature (T2) is preferably 100 degrees Celsius. When the detected temperature is less than or equal to the second set temperature T2, after determining whether the washing or rinsing process is completed (S116), the step (S106) of temporarily stopping the motor is repeatedly performed or before washing. The process ends.

However, if the detected temperature exceeds the second set temperature T2, it is determined whether the washing or rinsing process is completed (S110). When the input process is completed, the motor stops completely and all processes are finished. On the other hand, when the input process is incomplete, the motor is stopped (S111), and the draining or rewatering process is performed. Here, the stop time of the motor is preferably about 3 minutes. In addition, the drainage and resupply of some water may be performed during the time when the motor is stopped (S112). When the set time for stopping the motor has elapsed (S113), the remaining stroke is continued (S114), in which case the basic IPM duty control process (S103) is repeated. This is because the temperature of the switching unit 90 becomes sufficiently low while the motor is stopped for a predetermined time, and thus it is safe to proceed to the basic IPM duty control.

By the control method as described above, the switching unit 90 is prevented from being overheated and burned out by the operation of the motor in the washing or rinsing process, and the input process is performed even when the overheating of the switching unit 90 occurs. Since it is not interrupted, the dissatisfaction of the consumer is eliminated.

By the control method of the washing machine according to the present invention having the above configuration, when the temperature of the IPM is increased due to the overload of the motor, the operation of the motor is stopped for a certain time, thereby preventing the burnout of the IPM due to overheating It works.

In addition, by stopping the motor before the IPM is overheated, there is an effect that the risk of fire is removed.

In addition, even if the IPM overheating phenomenon occurs, the washing process is not completely stopped, and after a certain time elapses, the consumer's dissatisfaction is solved.

Claims (10)

delete A washing or rinsing command is input, and the motor is driven according to the input command; Controlling motor driving to a basic IPM duty; Sensing a switching unit (IPM) temperature; Controlling the changed IP duty after the motor is paused when the sensed switching unit IPM temperature exceeds the first set temperature; And If the temperature of the switching unit exceeds a second set temperature, controlling the basic IP duty after the motor is paused again. The method of claim 2, The control method of the washing machine, characterized in that the motor stop time is longer when the second set temperature exceeds the motor stop time when the temperature of the switching unit exceeds the first set temperature. The method of claim 2, And said second set temperature is higher than the first set temperature. The method of claim 2, The on-time of the motor is longer than the off time in the basic IP duty control, and the on-time of the motor is shorter than the off time in the modified IPM duty control. The method of claim 2, Method for controlling a washing machine, characterized in that all or part of the wash water drainage and water supply is performed while the motor is paused. A washing or rinsing command is input; The motor is controlled to the basic IPM DUTY according to the input command to repeat the forward and reverse rotation; Sensing a switching unit (IPM) temperature; Controlling the changed IP duty after the motor is paused when the sensed switching unit IPM temperature exceeds the first set temperature; and The control method of the washing machine comprising the step of repeating the forward and reverse rotation after the motor is paused again, when the second set temperature is exceeded in the process of being controlled by the changed IP duty, the basic IP duty. The method of claim 7, wherein The motor is stopped for 6 seconds after 21 seconds of operation by the basic IP duty, The control method of the washing machine characterized in that the motor is stopped for 10 seconds after the operation for 4 seconds by the changed IP duty. The method of claim 7, wherein The first set temperature is 85 degrees Celsius, the second set temperature is a control method of the washing machine, characterized in that 100 degrees Celsius. The method of claim 7, wherein When the temperature of the switching unit exceeds the first set temperature, the motor stop time is 1 minute, The motor stop time when the 2nd set temperature is exceeded is 3 minutes. The control method of the washing machine characterized by the above-mentioned.

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