公开(公告)号：US20180367024A1

公开(公告)日：2018-12-20

申请号：US15739925

申请日：2016-06-24

Applicant: LG ELECTRONICS INC.

Inventor： Kyeongtae KIM ,  Yonghwa LEE ,  Jeongeon OH

IPC: H02M1/12 ,  H02M3/07 ,  H02M5/451 ,  H02M1/14

CPC classification number: H02M1/12 ,  F24F11/88 ,  F24F11/89 ,  H01F30/12 ,  H02M1/143 ,  H02M1/15 ,  H02M1/4225 ,  H02M3/07 ,  H02M5/451 ,  H02M5/458 ,  H02M7/48 ,  H02M7/5395 ,  H02M2001/0009 ,  H02M2001/007 ,  H02M2003/1566 ,  H02M2003/1586

Abstract: The present invention relates to a power conversion device and an air conditioner comprising the same. The power conversion device according to one embodiment of the present invention comprises: a rectification unit for rectifying input alternating current power; a boost converter for boosting power rectified from the rectification unit and outputting the same; a dc-end capacitor connected to an output end of the boost converter; an inductor current detection unit for detecting an inductor current flowing in an inductor within the boost converter; a dc-end voltage detection unit for detecting voltages of both ends of the dc-end capacitor; and a control unit for controlling the boost converter, wherein the control unit generates and outputs a converter switching control signal by performing proportional resonant control for a duty command value of a switching element within the boost converter, on the basis of the detected inductor current and dc-end voltage. Therefore, a harmonic current component flowing through a dc-end capacitor induced by a ripple component of an input voltage can be reduced.

公开(公告)号：US20220224276A1

公开(公告)日：2022-07-14

申请号：US17574879

申请日：2022-01-13

Applicant: LG Electronics Inc.

Inventor： Yonghwa LEE ,  Songhee YANG ,  Jeongeon OH

IPC: H02P29/028 ,  H02P27/08 ,  F24F1/20

Abstract: A motor driving device and an air conditioner having the same of the present disclosure limits the switching of a winding switching device when there is a possibility that the winding switching device is deteriorated, in order to increase the life of winding switching device of a motor and prevent malfunction.

公开(公告)号：US20210270511A1

公开(公告)日：2021-09-02

申请号：US17185339

申请日：2021-02-25

Applicant: LG Electronics Inc.

Inventor： Sunghwan KIM ,  Jeongeon OH ,  Yonghwa LEE ,  Songhee YANG

IPC: F25B49/02 ,  H02P27/08

Abstract: A motor driving apparatus includes: an inverter that includes a plurality of switching elements and that is configured to output AC power to a motor by a switching operation of the plurality of switching elements, a switching unit that includes a relay and that is configured to switch a connection mode of the motor by an operation of the relay, and an inverter controller configured to control the inverter and the switching unit. The inverter controller is configured to, based on the relay being turned off, apply a reverse voltage to the relay.

公开(公告)号：US20180191279A1

公开(公告)日：2018-07-05

申请号：US15855012

申请日：2017-12-27

Applicant: LG ELECTRONICS INC.

Inventor： Yonghwa LEE ,  Donggeun LEE ,  Jeongeon OH

IPC: H02P6/17 ,  H02P6/18

CPC classification number: H02P6/17 ,  H02P6/18 ,  H02P21/24 ,  H02P27/08 ,  H02P27/085

Abstract: Provided are a motor control device and a method for controlling a motor control device. A switching frequency is varied with respect to a control sampling for controlling an inverter, whereby controlling is performed by securing a required control sampling according to a motor speed.

公开(公告)号：US20220220966A1

公开(公告)日：2022-07-14

申请号：US17570910

申请日：2022-01-07

Applicant: LG Electronics Inc.

Inventor： Yonghwa LEE ,  Sanghyeon KIM ,  Jeongeon OH

IPC: F04D25/06 ,  H02M1/08 ,  H02M3/158

Abstract: The present disclosure relates to a motor driving apparatus and an air conditioner including the same. The motor driving apparatus and the air conditioner including the same according to an embodiment of the present disclosure include: a switching device disposed between an inverter and a motor; and a controller, which in response to windings of the motor being switched from a first connection to a second connection, controls an operating frequency of the motor to be less than or equal to a first frequency, and in response to the windings of the motor being switched from the second connection to the first connection, controls an operating frequency of the motor to be less than or equal to a second frequency which is less than the first frequency. Accordingly, burnout of the switching device for switching connection of the motor windings may be prevented.

公开(公告)号：US20220205673A1

公开(公告)日：2022-06-30

申请号：US17563492

申请日：2021-12-28

Applicant: LG Electronics Inc.

Inventor： Yonghwa LEE ,  Yongsoo CHO ,  Jeongeon OH

IPC: F24F11/88 ,  F24F11/38 ,  F24F11/89

Abstract: The present disclosure relates to a motor driving apparatus and an air conditioner including the same. The motor driving apparatus and the air conditioner including the same according to an embodiment of the present disclosure include: a switching device disposed between an inverter and a motor, wherein while windings of the motor are connected in a first connection, an output current at a first level is output from the inverter, and while the windings of the motor are connected in a second connection, the output current at the first level is output from the inverter, such that it is possible to determine whether the switching device for switching connection of the motor is abnormal.