公开(公告)号：US10542600B2

公开(公告)日：2020-01-21

申请号：US15936543

申请日：2018-03-27

Applicant: SAMSUNG ELECTRONICS CO., LTD.

Inventor： Bong Jin Lee ,  Kyu Cheol Kang ,  Kil Yoan Chung

IPC: H05B33/08 ,  H05B37/02

Abstract: A light emitting diode driving apparatus includes a rectifier, a converter, a feedback circuit, and a controller. The rectifier converts alternating current power to direct current (DC) power. The converter supplies driving power to a plurality of LEDs based on the DC power. The feedback circuit generates a feedback signal based on a current flowing in the plurality of LEDs and adjusts a magnitude of the feedback signal. The controller changes a maximum value of a current output by the converter based on the adjusted magnitude of the feedback signal.

公开(公告)号：US09854633B1

公开(公告)日：2017-12-26

申请号：US15437020

申请日：2017-02-20

Applicant: Samsung Electronics Co., Ltd.

Inventor： Bong Jin Lee ,  Kil Yoan Chung

IPC: H05B33/08

CPC classification number: H05B33/083 ,  H05B33/0827

Abstract: A light emitting device array comprises a plurality of light emitting diode (LED) strings connected in parallel to each other, each of which includes a plurality of light emitting devices connected in series. A sum of forward voltages (Vf) of a plurality of light emitting devices included in at least one LED string among the plurality of LED strings is less than that of forward voltages of a plurality of light emitting devices included in a different LED string. The at least one LED string includes a voltage compensation unit, to compensate for a difference in forward voltage levels between the at least one LED string and the different LED string.

公开(公告)号：US10362654B2

公开(公告)日：2019-07-23

申请号：US16168009

申请日：2018-10-23

Applicant: SAMSUNG ELECTRONICS CO., LTD.

Inventor： Sang Cheol Bong ,  Min Soo Han ,  Hyun Jung Kim ,  Kil Yoan Chung

IPC: H05B33/08

Abstract: A lighting apparatus includes first and second light emitting areas, a color temperature controller, and a balance circuit. The first light emitting area includes first light-emitting arrays connected in series and outputs light of a first color temperature. The second light emitting area includes second light-emitting arrays connected in series and connected to the first light emitting area in parallel. The second light-emitting arrays output light of a second color temperature different from the first color temperature. The color temperature controller is selectively connected to at least one of an input node of the first light emitting area and an input node of the second light emitting area. The color temperature controllers determines an on/off state of the first and second light emitting areas. The balance circuit is connected to at least one of the first and second light emitting areas in series.

公开(公告)号：US10123386B1

公开(公告)日：2018-11-06

申请号：US15941085

申请日：2018-03-30

Applicant: SAMSUNG ELECTRONICS CO., LTD.

Inventor： Sang Cheol Bong ,  Min Soo Han ,  Hyun Jung Kim ,  Kil Yoan Chung

IPC: H05B33/08

Abstract: A lighting apparatus includes first and second light emitting areas, a color temperature controller, and a balance circuit. The first light emitting area includes first light-emitting arrays connected in series and outputs light of a first color temperature. The second light emitting area includes second light-emitting arrays connected in series and connected to the first light emitting area in parallel. The second light-emitting arrays output light of a second color temperature different from the first color temperature. The color temperature controller is selectively connected to at least one of an input node of the first light emitting area and an input node of the second light emitting area. The color temperature controllers determines an on/off state of the first and second light emitting areas. The balance circuit is connected to at least one of the first and second light emitting areas in series.