Laundry treatment machine
AssigneeLG Electronics Inc.
InventorsChangyoung Cheon, Jihoon Kim, Junho Park
Life of this patent
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Abstract
The present disclosure relates to a laundry treatment machine. A laundry treatment machine according to an embodiment of the present disclosure includes: an inverter converting a direct current (DC) voltage from a converter into an alternating current (AC) voltage based on a switching operation and outputting the converted AC voltage to a circulation pump motor; and a controller to control a speed of the circulation pump motor to be increased before a time point at which a speed of a washing tub motor increases. Accordingly, the washing tub motor and the circulation pump motor can be operated in synchronization with each other. As a result, it is possible to improve washing power based on circulation pumping during washing.
Claims19
A laundry treatment machine comprising:
- a washing tub;
- a washing tub motor to rotate the washing tub;
- a circulation pump to circulate wash water introduced from the washing tub by pumping;
- a circulation pump motor to operate the circulation pump;
- a converter to output a direct current (DC) voltage;
- an inverter to convert the DC voltage from the converter into an alternating current (AC) voltage based on a switching operation and to output the converted AC voltage to the circulation pump motor;
- and
- a controller to control a speed of the circulation pump motor to be gradually increased before a time point at which a speed of the washing tub motor increases,
- wherein the speed of the circulation pump motor is changed before the time point at which the speed of the washing tub motor increases,
- wherein the controller is configured to:
- perform power control to the circulation pump motor during circulation pumping, and
- in response to a determination that a water level in the washing tub decreases, control a supply of power to the circulation pump motor such that the supplied power to the circulation pump motor is within a first allowable range based on a first power.
A laundry treatment machine comprising:
- a washing tub;
- a washing tub motor to rotate the washing tub;
- a circulation pump to circulate wash water introduced from the washing tub by pumping;
- a circulation pump motor to operate the circulation pump;
- a converter to output a direct current (DC) voltage;
- an inverter to convert the DC voltage from the converter into an alternating current (AC) voltage based on a switching operation and to output the converted AC voltage to the circulation pump motor;
- and
- a controller to control a speed increase period of the circulation pump motor to be synchronized in response to a speed increase period of the washing tub motor,
- wherein the controller controls a speed of the circulation pump motor to be gradually increased in response to the speed increase period of the washing tub motor,
- wherein the controller is configured to:
- perform power control to the circulation pump motor during circulation pumping, and
- in response to determining that a water level in the washing tub is decreasing, control supply of a power to the circulation pump motor such that the power supplied to the circulation pump motor is within a first allowable range based on a first power.
A circulation pump driving apparatus comprising:
- a circulation pump to circulate wash water introduced from an inner tub by pumping;
- a circulation pump motor to operate the circulation pump;
- a converter to output a direct current (DC) voltage;
- an inverter to convert the DC voltage from the converter into an alternating current (AC) voltage based on a switching operation and to output the converted AC voltage to the circulation pump motor;
- and
- a controller to control a speed of the circulation pump motor to be gradually increased before a time point at which a speed of an inner tub motor increases,
- wherein the speed of the circulation pump motor is changed before the time point at which the speed of the inner tub motor increases,
- wherein the controller is configured to:
- perform power control of the circulation pump motor during circulation pumping, and
- in response to determining that a water level in the inner tub decreasing, control a supply of power to the circulation pump motor to be within a first allowable range based on a first power.
Dependencies are inferred from the claim text.