Lg Electronics Inc.

Research Cooperation Foundation of Yeungnam University

Iucf-hyu

Chungill Lee

Jungmoon Je

Hansu Jung

Kiwook Lee

Junho Lee

Soongkeun Lee

Seongwoo Kim

Namki Lee

Hoonbong Lee

Sangbok Choi

Minho Jang

Kuyoung Son

Yonghwan Eom

Kwang Sik Kim

Hoyong Jang

Junsung Kim

Seonwook Park

Seonghoon Han

Sungwan Kim

Seokhee Cho

Hanbeom Yeom

Kwangsik Kim

Kibae Lee

Aejin Byun

Jeongbin Rew

Jaejung Yun

Jeongtae Kim

Younggeun Lee

Jangmok Kim

Hyunkeun Ku

Sungwoo Bae

Sangil Kim

Jaehoon Joo

Raeyoung Kim

The present disclosure relates to a drain pump driving apparatus and a laundry treatment machine including the same. A drain pump driving apparatus according to an embodiment of the present disclosure includes a controller configured to drive a motor, during drainage, based on an output current and a direct current (DC) terminal voltage with a first power when a lift is at a first level and to drive the motor with the first power when the lift is at a second level that is greater than the first level, wherein the lift is a difference between a water level of a water introduction part through which water flows into a drain pump and a water level of a water discharge part through which the water is discharged out of the drain pump. Accordingly, water pumping can be performed smoothly even if the lift is changed during the drainage.

Drain pump driving apparatus and laundry treatment machine including the same

The present disclosure relates to a laundry treatment machine. A laundry treatment machine according to an embodiment of the present disclosure including 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 drain motor; and a controller to control the drain motor to operate at any one of a first speed, a second speed less than the first speed, and a stop when the washing tub motor is accelerated. Accordingly, according to the operation of the washing tub motor, it is possible to efficiently drive the drain motor.

Laundry treatment machine

The present disclosure relates to a drain pump driving apparatus and a laundry treatment machine including the same. A drain pump driving apparatus according to an embodiment of the present disclosure includes: a converter; a voltage dropper to drop the DC voltage from the converter; an inverter module to operate based on a first voltage from the voltage dropper and to output AC voltage converted by a switching operation to a drain pump motor; a controller to operate based on a second voltage from the voltage dropper and to control the inverter module; and a voltage adjuster to adjust the level of voltage information of the motor outputted from the inverter module and to output the adjusted voltage information to the controller. Accordingly, it is possible to stably drive the drain motor.

Disclosed herein is a drain pump driving apparatus and a laundry treatment machine including the same. The drain pump driving apparatus and the laundry treatment machine including the same according to an embodiment of the present invention include a motor to operate the drain pump, an inverter to convert a direct current (DC) power to an alternating current (AC) power by a switching operation and output the converted AC power to the motor, an output current detector to detect an output current flowing to the motor, and a controller to control the inverter, wherein the controller may calculate a speed ripple of the motor based on the output current and performs a control operation based on the calculated speed ripple of the motor to change a speed of the motor.

A refrigerator includes: an ice maker for generating ice; an ice bin for storing the ice and including a rotational blade that is rotated in order to discharge the ice; a motor for generating power for rotating the rotational blade; a manipulation pad provided on the door of the refrigerator and manipulated to discharge the ice from the ice bin; a manipulation sensing part for detecting the manipulation of the manipulation pad; and a controller for operating the motor when the manipulation of the manipulation pad is detected by the manipulation sensing part, wherein the controller rotates the motor in one direction to discharge the ice from the ice bin and the controller rotates the motor in the other direction, which is the opposite direction of the one direction, for a set period of time when the manipulation of the manipulation pad is no longer detected.

Refrigerator and control method thereof

Provided is a vacuum cleaner. The vacuum cleaner includes a cleaner body including a moving device for moving, a suction device connected to the cleaner body to suction dusts and air and guide the suctioned dusts and air to the cleaner body, the suction device including a handle, a detection device for detecting a distance between the handle and the cleaner body, and a controller determining whether movement of cleaner body is necessary on the basis of the distance between the cleaner body and the handle, the controller controlling the moving device when the movement of the cleaner body is necessary. The controller controls the moving device to allow the cleaner body to avoid an obstacle when it is determined that an operation for avoiding the obstacle is necessary while the moving device operates.

Vacuum cleaner and method for controlling the same

Disclosed is a drain pump driving apparatus and a laundry treatment machine including the same. The laundry treatment machine includes: a drain pump driving apparatus configured to drive a drain pump, wherein the drain pump driving apparatus includes: a motor to drive the drain pump; an inverter to convert a direct current (DC) power to an alternating current (AC) power by a switching operation, and output the converted AC power to the motor; an output current detector to detect an output current flowing to the motor; and a controller configured to control the inverter, wherein the controller is further configured to calculate a speed of the motor based on an output current, and calculate a lift, which is a difference between a water level of a water introduction part through which water flows into the drain pump and s water level of a water discharge part for discharging water from the drain pump, based on the calculated speed.

The present disclosure relates to a motor driving apparatus and, more specifically, to a motor driving apparatus which allows a maximum torque operation by correcting an angle error occurring during quick acceleration of a motor in a sensorless system. The motor driving apparatus comprises: an inverter for driving a motor, using an alternating current voltage; and a control unit for outputting a PWM signal for controlling an operation of a switching element included in the inverter. Here, the control unit determines an inductance parameter used to calculate a speed command value for determining a duty ratio of a PWM signal, and determines whether the motor is being accelerated, on the basis of a current change measured from the inverter. When the motor is being accelerated, the control unit enables a maximum torque operation by reducing an angle error of a rotor through a correction of reducing a previously-determined inductance parameter.

Motor driving apparatus

The present invention relates to a vacuum cleaner. The vacuum cleaner of the present invention comprises: a cleaner body having a suction motor for generating suctioning force, and running in operating mode and charging mode; a suctioning part communicating with the cleaner body, for suctioning air and dust; a battery assembly capable of supplying power to the suction motor and having a plurality of battery packs; a controller for controlling the operation of the suction motor; a current regulating unit for regulating the current applied to the suction motor in a state in which the plurality of battery packs are serially connected; a first switching mechanism for serially connecting the plurality of battery packs; and a second switching mechanism for parallelly connecting the plurality of battery packs.

Vacuum cleaner

A home appliance is disclosed, including a first circuit unit including a converter configured to convert an Alternating Current (AC) power into a Direct Current (DC) power, a first coil, a first modulator/demodulator configured to wirelessly transmit the DC power generated by the converter using the first coil, and a first controller configured to control the first modulator/demodulator, and a second circuit including a second coil configured to receive a wireless power transmitted by the first circuit unit, a second modulator/demodulator configured to convert the wireless power received from the second coil, a rectifier configured to rectify an AC power generated by the second modulator/demodulator, and a second controller configured to control operation of the second modulator/demodulator, wherein the first modulator/demodulator and the second modulator/demodulator perform bidirectional time-division data communication.

Home appliance

A home appliance is disclosed, including a motor, a drive unit configured to drive the motor, a first circuit unit including a main controller configured to control the drive unit, a display unit, and a second circuit unit including a display controller configured to control the display unit. The first circuit unit transmits wireless power to the second circuit unit, using a first frequency, and the second circuit unit transmits data to the first circuit unit, using a second frequency different from the first frequency. Thereby, wireless power transmission and bidirectional communication are performed between the first and second circuit units.

A vacuum cleaner may include a cleaner body having a suction motor and a suctioning portion configured to be in communication with the cleaner body and to suction air and dust. One of a battery assembly having a battery or a cord reel assembly having a power cord may be installed in the cleaner body. The vacuum cleaner may also include a controller to control the suction motor by modifying a pulse width modulation (PWM) duty cycle of an inverter providing power to the suction motor based on whether the battery assembly or the cord reel assembly is installed in the cleaner body.

The present disclosure relates to a motor driving device and a laundry treatment apparatus. The motor driving device may include an inverter to convert DC power into AC power according to a switching operation and to output the converted AC power to a motor, an output current detector to detect an output current flowing through the motor, and a controller to control the inverter based on the detected output current. The controller changes a carrier frequency, changes a voltage command based on the changed carrier frequency and outputs an inverter switching control signal to the inverter based on the changed carrier frequency and the changed voltage command. Accordingly, noise may be reduced during operation of the motor.

Growing community of inventors

Seoul, South Korea

Chungill Lee