公开(公告)号：US20240121871A1

公开(公告)日：2024-04-11

申请号：US18279278

申请日：2022-03-07

Applicant: SIGNIFY HOLDING B.V.

Inventor： SHAN QING ,  GUY LOUIS PAUL DE BONDT ,  JUNWEI TIAN ,  DALIBOR CVORIC ,  MORNA SHEN ,  HERMANUS JOHANNES MARIA VOS ,  FRITS TOBI DE JONGH

IPC: H05B45/59 ,  H05B47/17

CPC classification number: H05B45/59 ,  H05B47/17

Abstract: In order to provide a balance between a fast start-up in start-up phase and a low light output ripple in normal operation phase, it is provided a LED driving circuit comprising: an input to receive a LED driving current, a buffer circuit adapted to buffer said LED driving current, and an output to be connected to LED and adapted to output the LED driving current, after buffered, to the LED, characterized in that, further comprises a buffer adjustment circuit adapted to adjust the buffer capability of the buffer circuit at a first level, in a start-up phase of the LED driving circuit when the LED driving circuit starts to receive said LED driving current, and adjust the buffer capability of the buffer circuit at a second level larger than the first level in a normal operation phase later than the start-up phase.

公开(公告)号：US20220061142A1

公开(公告)日：2022-02-24

申请号：US17417173

申请日：2019-12-17

Applicant: SIGNIFY HOLDING B.V.

Inventor： XIAJUAN WU ,  DALIBOR CVORIC ,  YE LIU ,  HAIMIN TAO ,  YUN WANG ,  HAN LU ,  JING YANG ,  DEYONG KONG ,  JING LI

IPC: H05B47/20 ,  F21V25/04

Abstract: A lamp has a safety circuit connected to first and second electrical connection terminals. A test is used to detect if the first and second electrical connection terminals are both connected to external power without an interfering impedance such a human body, and only then enable operation of the lamp. A time for the test is different from a time when another lamp in the system applies a test.

公开(公告)号：US20200015329A1

公开(公告)日：2020-01-09

申请号：US16470272

申请日：2017-12-11

Applicant: SIGNIFY HOLDING B.V.

Inventor： DALIBOR CVORIC ,  YI WANG ,  HAIMIN TAO

IPC: H05B33/08

Abstract: A retrofit LED tube for connection to an electronic ballast, said retrofit LED tube comprising an LED array for emitting light, an alternating current, AC, LED driver arranged for receiving an AC supply voltage and for driving said LED array based on said received AC supply voltage, a filament circuit for supporting a filament current circulating back to said electronic ballast for enabling lamp recognition by said electronic ballast during a lamp recognition phase, and a lamp current to said AC LED driver for driving said LED array during a steady-state phase, and comprising a filament enhancement circuit arranged to reduce at least one of said filament current and said lamp current flowing through said filament circuit, during said steady-state phase.

公开(公告)号：US20240147590A1

公开(公告)日：2024-05-02

申请号：US18281104

申请日：2022-03-04

Applicant: SIGNIFY HOLDING B.V.

Inventor： GUY LOUIS PAUL DE BONDT ,  FRITS TOBI DE JONGH ,  DALIBOR CVORIC ,  HERMANUS JOHANNES MARIA VOS

IPC: H05B45/375 ,  H05B45/36

CPC classification number: H05B45/375 ,  H05B45/36

Abstract: A power converter for converting an input to an output for driving a load, said power converter comprising a switched mode power supply, SMPS, arranged for receiving an input and for converting said input to an output for driving said load, a buffer capacitor connected in a parallel branch across said load and arranged for buffering said output from said SMPS, a charge circuit, separate from said SMPS, and arranged for providing a charge current to said buffer capacitor until a voltage over said buffer capacitor exceeds a voltage threshold.