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公开(公告)号：US09742336B2
公开(公告)日：2017-08-22
申请号：US14205614
申请日：2014-03-12
Applicant: LG Electronics Inc.
Inventor： Jonghyun Jeon , Taeyoung Park , Jungsong Moon , Sangyoung Kim , Joonsik An
CPC classification number: H02P27/06 , F24F11/89 , H02M7/06 , H02M7/1552
Abstract: A power converter and an air conditioner having the same, in which the power converter includes a rectifying unit configured to rectify an input AC current and an interleave converter that has a plurality of converters and that is configured to convert rectified output from the rectifying unit to DC power and output the converted DC power. The power converter also includes a capacitor connected to an output terminal of the interleave converter, and a converter controller configured to control the interleave converter. The converter controller controls the interleave converter by calculating a load level of both terminals of the capacitor and changing a number of operating converters in the plurality of converters of the interleave converter based on the determined load level of both terminals of the capacitor.
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公开(公告)号：US20180195772A1
公开(公告)日：2018-07-12
申请号：US15863314
申请日：2018-01-05
Applicant: LG ELECTRONICS INC.
Inventor： Jonghyun Jeon , Joonsik An , Keunwoo Jung
Abstract: The present disclosure relates to a chiller. A compressor driver includes: a compressor including a compressor motor and a magnetic bearing; a coil driver including a switching element and to apply a current to a bearing coil of the magnetic bearing by a switching operation of the switching element to cause a rotor of the compressor motor to be levitated from or land on the magnetic bearing; and a controller to control the switching element of the coil driver, wherein, when the rotor of the compressor motor lands, the controller is configured to gradually decrease the current flowing through the bearing coil. Accordingly, damage to the rotor of the compressor motor can be prevented when the compressor motor is stopped in a magnetic levitation system.
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公开(公告)号：US10951029B2
公开(公告)日：2021-03-16
申请号：US16132710
申请日：2018-09-17
Applicant: LG Electronics Inc.
Inventor： Kyung Min Kim , Joonsik An
Abstract: A power source input device for both AC/DC power sources includes a first power source input unit that is provided at a power source input terminal of an electric power device to convert an AC or DC commercial power source selectively input from the outside into a DC driving power source and supply the converted DC driving power source to an accessory device. A second power source input unit is provided in the accessory device to supply the DC driving power source supplied from the first power source input unit to at least one load, thereby simplifying a configuration of a power source input terminal of each of the electric power devices and reducing a manufacturing cost thereof.
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公开(公告)号：US11031859B2
公开(公告)日：2021-06-08
申请号：US16737994
申请日：2020-01-09
Applicant: LG Electronics Inc.
Inventor： Mun Seok Seo , Seongju Kim , Joonsik An
IPC: H02M1/088 , H02P27/08 , H02M1/44 , H02M1/08 , H02M3/156 , H02M7/48 , H02M1/00 , H02J1/00 , H02P27/06
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.
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Patent Agency Ranking
公开(公告)号：US10677496B2
公开(公告)日：2020-06-09
申请号：US15863314
申请日：2018-01-05
Applicant: LG ELECTRONICS INC.
Inventor： Jonghyun Jeon , Joonsik An , Keunwoo Jung
Abstract: The present disclosure relates to a chiller. A compressor driver includes: a compressor including a compressor motor and a magnetic bearing; a coil driver including a switching element and to apply a current to a bearing coil of the magnetic bearing by a switching operation of the switching element to cause a rotor of the compressor motor to be levitated from or land on the magnetic bearing; and a controller to control the switching element of the coil driver, wherein, when the rotor of the compressor motor lands, the controller is configured to gradually decrease the current flowing through the bearing coil. Accordingly, damage to the rotor of the compressor motor can be prevented when the compressor motor is stopped in a magnetic levitation system.
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6.发明授权公开(公告)号：US11306777B2
公开(公告)日：2022-04-19
申请号：US16169311
申请日：2018-10-24
Applicant: LG Electronics Inc.
Inventor： Keun Woo Jung , Kyung Min Kim , Jonghyun Jeon , Joonsik An
Abstract: A magnetic bearing control apparatus includes a plurality of output elements configured to generate electromagnetic force, a magnetic bearing configured to float a rotation shaft from a surface of the magnetic bearing based on the electromagnetic force generated by the plurality of output elements, at least one displacement sensor configured to sense a displacement of the rotation shaft, and a controller. The controller is configured to control a current supplied to the plurality of output elements, to control a position of the rotation shaft based on the current supplied to the plurality of output elements according to the displacement of the rotation shaft, and to determine a failure of the displacement sensor.
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公开(公告)号：US10771002B2
公开(公告)日：2020-09-08
申请号：US16124327
申请日：2018-09-07
Applicant: LG Electronics Inc.
Inventor： Seongju Kim , Mun Seok Seo , Joonsik An
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.
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公开(公告)号：US10554114B2
公开(公告)日：2020-02-04
申请号：US16132685
申请日：2018-09-17
Applicant: LG Electronics Inc.
Inventor： Mun Seok Seo , Seongju Kim , Joonsik An
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.
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公开(公告)号：US09732991B2
公开(公告)日：2017-08-15
申请号：US14582905
申请日：2014-12-24
Applicant: LG ELECTRONICS INC.
Inventor： Joonsik An , Sangyoung Kim , Taeyoung Park , Kyungmin Kim
CPC classification number: F25B1/005 , H02M1/4225 , H02M5/44 , H02P6/28 , Y02B70/126
Abstract: A motor driving device includes a rectifier to rectify inputted alternating current (AC) power, a boost converter to boost and to output the power rectified by the rectifier, and an inverter including a plurality of switching devices to output converted AC power to a motor using a voltage from the boost converter. Accordingly, a voltage utilization ratio of a voltage input to an inverter in the motor driving device using a low-capacitance capacitor is enhanced.
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