公开(公告)号：US20210006192A1

公开(公告)日：2021-01-07

申请号：US16919660

申请日：2020-07-02

Applicant: LG Electronics Inc.

Inventor： Seongju KIM ,  Donggeun LEE

IPC: H02P27/12 ,  H02P21/13 ,  H02P21/18 ,  H02P21/22 ,  H03H1/02 ,  A47L9/28

Abstract: A motor driving apparatus for a home appliance includes: a power supply part configured to supply DC power, a DC-Link capacitor connected to the power supply part, an inverter connected to the DC-Link capacitor and comprising a plurality of switching elements, the inverter being configured to convert, by operating the plurality of switching elements, the DC power into AC power and output the converted AC power to a motor, a DC-Link resistor element disposed between the DC-Link capacitor and the inverter, a signal generator connected to the DC-Link resistor element and configured to generate and output a plurality of signals based on an output current flowing through the DC-Link resistor element, and a controller configured to control the inverter based on the plurality of signals received from the signal generator.

公开(公告)号：US20210068313A1

公开(公告)日：2021-03-04

申请号：US17010935

申请日：2020-09-03

Applicant: LG Electronics Inc.

Inventor： Seongju KIM ,  Donggeun LEE

IPC: H05K7/20 ,  A47L9/28 ,  H02K11/33 ,  H02P27/06

Abstract: A motor driving apparatus for a cleaner includes a DC terminal capacitor, an inverter including switching elements configured to convert the DC power into AC power, a motor configured to operate the inverter, an impeller connected to the motor and configured to circulate air, and a printed circuit board having a first surface that mounts the switching elements and faces toward the motor and the impeller, and a second surface that mounts the DC terminal capacitor. The printed circuit board includes circuit elements mounted on a first area of the first surface and configured to carry a current having a level greater than or equal to a predetermined level. The first area is positioned in a flow path of the air circulated by the impeller.

公开(公告)号：US20210021220A1

公开(公告)日：2021-01-21

申请号：US16929636

申请日：2020-07-15

Applicant: LG Electronics Inc.

Inventor： Jungsong MOON ,  Seongju KIM ,  Donggeun LEE

IPC: H02P21/09 ,  H02P21/18 ,  H02P21/22 ,  H02P27/12

Abstract: A motor driving apparatus and a control method thereof, including a dc-link capacitor configured to store DC power, an inverter including a plurality of switching elements and converting the DC power stored in the dc-link capacitor into AC power to output the power to a motor, a dc-link resistor element disposed between the dc-link capacitor and the inverter; and a controller configured to control an operation of the inverter. The controller calculates a phase difference between a first reference voltage vector among a plurality of reference voltage vectors that are preset on the space vector and a voltage command, generates a switching frequency, determines a first operating point located in a dead band that is a one-phase current undetectable area in one switching cycle and a second operating point located at an outer position including a boundary of the dead band, and controls operation of the plurality of switching elements.

公开(公告)号：US20190103803A1

公开(公告)日：2019-04-04

申请号：US16132685

申请日：2018-09-17

Applicant: LG Electronics Inc.

Inventor： Mun Seok SEO ,  Seongju KIM ,  Joonsik AN

IPC: H02M1/088 ,  H02P27/08 ,  H02M1/08 ,  H02M1/44

Abstract: A device for stabilizing a direct current (DC) distribution system includes a capacitor unit charged by a DC voltage supplied by a power supply stage of the distribution system. The device further includes an inverter that has three pair of switching elements. The device also includes a controller that controls a plurality of switches thereof to selectively enable an inverter circuit or a voltage stabilizing circuit of the DC distribution system. The device alleviates instability of DC voltage which may be generated in a transient period, or to drive a motor connected to the device.

公开(公告)号：US20190081586A1

公开(公告)日：2019-03-14

申请号：US16124327

申请日：2018-09-07

Applicant: LG Electronics Inc.

Inventor： Seongju KIM ,  Mun Seok SEO ,  Joonsik AN

IPC: H02P27/08 ,  H02M1/14 ,  H02M1/088 ,  H02M1/08 ,  F04B35/04

CPC classification number: H02P27/08 ,  F04B35/04 ,  H02M1/083 ,  H02M1/088 ,  H02M1/143 ,  H02M7/53871 ,  H02M2001/0058

Abstract: A device for stabilizing a direct current (DC) distribution system includes a capacitor unit charged by a DC voltage supplied by a power supply stage of the distribution system. The device further includes an inverter that has three pair of switching elements. The device also includes a voltage stabilization circuit constructed using one pair out of the three pairs of switching elements in the inverter. The device also includes a controller that controls the voltage stabilization circuit to alleviate instability of a DC voltage generated in a transient period.