公开(公告)号：US20240147590A1

公开(公告)日：2024-05-02

申请号：US18281104

申请日：2022-03-04

申请人： SIGNIFY HOLDING B.V.

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

IPC分类号： H05B45/375 ,  H05B45/36

CPC分类号： H05B45/375 ,  H05B45/36

摘要： 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.

公开(公告)号：US20240121871A1

公开(公告)日：2024-04-11

申请号：US18279278

申请日：2022-03-07

申请人： SIGNIFY HOLDING B.V.

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

IPC分类号： H05B45/59 ,  H05B47/17

CPC分类号： H05B45/59 ,  H05B47/17

摘要： 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.