公开(公告)号：US11754073B2

公开(公告)日：2023-09-12

申请号：US16683712

申请日：2019-11-14

Applicant: LG ELECTRONICS INC.

Inventor： Sehoon Kim ,  Jangsik Kim

IPC: F04C28/28 ,  F25B49/02 ,  H02P1/02 ,  F04D25/06 ,  F04D27/00 ,  F04C29/00 ,  F04C23/00 ,  F04B49/20 ,  F04C18/02 ,  F04B49/06 ,  F04B51/00

CPC classification number: F04C28/28 ,  F04B49/06 ,  F04B49/20 ,  F04B51/00 ,  F04C18/0215 ,  F04C23/008 ,  F04C29/0085 ,  F04D25/06 ,  F04D27/00 ,  F25B49/022 ,  F25B49/025 ,  H02P1/029 ,  F04B2203/0201 ,  F04C2270/72 ,  F04C2270/86 ,  F25B2700/151

Abstract: A compressor fault diagnostic apparatus including a current sensing unit to sense a current flowing through a motor of the compressor, a fault diagnostic unit to determine whether or not the motor performs a reverse rotation based on the current flowing through the motor, and a cut-off unit to remove power based on a determination of the fault diagnostic unit.

公开(公告)号：US11300118B2

公开(公告)日：2022-04-12

申请号：US16709213

申请日：2019-12-10

Applicant: LG Electronics Inc.

Inventor： Jangsik Kim ,  Daeho Choi

IPC: F04B49/06 ,  H02P7/00 ,  F04B49/20 ,  F25B31/02 ,  F25B49/02

Abstract: An operation controlling apparatus of a reciprocating compressor includes: a detector configured to detect a torque output by a motor of the reciprocating compressor, a rotation speed of the motor, a counter electromotive voltage of the motor, and a current applied to the motor; a controller configured to determine a mode switching time point for switching an operation mode of the reciprocating compressor based on the torque, the rotation speed, the counter electromotive voltage, and the current of the motor, and output a control signal for changing a wire ratio of the motor corresponding to the operation mode; and a driver configured to change the wire ratio of the motor based on the control signal and operate the reciprocating compressor in the operation mode among at least two operation modes.

公开(公告)号：US20200224948A1

公开(公告)日：2020-07-16

申请号：US16683712

申请日：2019-11-14

Applicant: LG ELECTRONICS INC.

Inventor： Sehoon KIM ,  Jangsik Kim

IPC: F25B49/02 ,  H02P1/02 ,  F04D27/00 ,  F04D25/06 ,  F04C28/28

Abstract: A compressor fault diagnostic apparatus including a current sensing unit to sense a current flowing through a motor of the compressor, a fault diagnostic unit to determine whether or not the motor performs a reverse rotation based on the current flowing through the motor, and a cut-off unit to remove power based on a determination of the fault diagnostic unit.

公开(公告)号：US11411392B2

公开(公告)日：2022-08-09

申请号：US16921014

申请日：2020-07-06

Applicant: LG ELECTRONICS INC.

Inventor： Jangsik Kim ,  Jaedong Kim

IPC: H02H9/00 ,  H02M1/32 ,  H02P27/06 ,  H02M7/537 ,  H02M5/458

Abstract: The present disclosure relates to a conversion circuit, an inverter, and a method of driving the inverter, wherein a switch is provided at an input terminal of a direct current (DC) link capacitor, so that power is charged in the DC link capacitor through a switching element at initial driving and charged in the DC link capacitor through a rectifier when a voltage level of the DC link capacitor is equal to or higher than a preset reference level, thereby limiting inrush current caused in the DC link capacitor through the switching element when the inrush current is caused.