公开(公告)号：US10893590B2

公开(公告)日：2021-01-12

申请号：US16799469

申请日：2020-02-24

Applicant: LUMILEDS LLC

Inventor： Wouter Soer ,  Willem Sillevis-Smitt

IPC: H05B45/22 ,  G06T7/90 ,  H05B47/11 ,  F21V5/04 ,  F21V23/00

Abstract: Techniques and devices are provided for sensing image data from a scene and activating primary light sources based on information sensed from the scene. Subsets of a plurality of primary light sources may be activated to emit sensing spectrum of light onto a scene. Combined image data may be sensed from the scene while the subsets of the plurality of primary light sources are activated. Reflectance information for the scene may be determined based on the combined image data and combined sensing spectra. Spectrum optimization criteria for the primary light sources may be determined based on the reference information and a desired output parameter provided by a user or determined by a controller. The plurality of primary light sources may be activated to emit a lighting spectrum based on the spectrum optimization criteria.

公开(公告)号：US20190268983A1

公开(公告)日：2019-08-29

申请号：US15906797

申请日：2018-02-27

Applicant: Lumileds LLC

Inventor： Zhi Hua Song ,  Wouter Soer

IPC: H05B33/08 ,  H02M7/06 ,  H02M3/156 ,  H02M1/08

Abstract: An apparatus is disclosed, comprising: a first light source having a first threshold voltage; a second light source having a second threshold voltage; a rectifier configured to receive an AC voltage as input and generate a DC voltage based on the AC voltage; a single-stage Buck converter section coupled to the rectifier, the first light source, and the second light source, the Buck converter section being configured to output a current generated based on the DC voltage towards the first light source and the second light source; and a switching circuit configured to reduce a load on the Buck converter section by periodically diverting the current away from the second light source when a magnitude of the AC voltage is less than or equal to a sum of the first threshold voltage and the second threshold voltage.

公开(公告)号：US10165640B2

公开(公告)日：2018-12-25

申请号：US15587567

申请日：2017-05-05

Applicant: Lumileds LLC

Inventor： Zhihua Song ,  Wouter Soer ,  Ron Bonne ,  Yifeng Qiu

IPC: H05B33/08 ,  H05K1/05 ,  H05K3/40 ,  H05K3/00 ,  H01L25/16 ,  H01L25/00 ,  H05K1/11 ,  H05K3/44 ,  H05K3/10 ,  H05K3/46 ,  H05K3/14 ,  H01R13/6591 ,  H05K9/00 ,  H05K1/18 ,  H05K3/30 ,  H05K1/02 ,  H05K3/18 ,  H05K3/16 ,  H05K13/00

Abstract: A multi-layer metal core printed circuit board (MCPCB) has mounted on it at least one or more heat-generating LEDs and one or more devices configured to provide current to the one or more LEDs. The one or more devices may include a device that carries a steep slope voltage waveform. Since there is typically a very thin dielectric between the patterned copper layer and the metal substrate, the steep slope voltage waveform may produce a current in the metal substrate due to AC coupling via parasitic capacitance. This AC-coupled current may produce electromagnetic interference (EMI). To reduce the EMI, a local shielding area may be formed between the metal substrate and the device carrying the steep slope voltage waveform. The local shielding area may be conductive and may be electrically connected, to a DC voltage node adjacent to the one or more devices.

公开(公告)号：US20180035500A1

公开(公告)日：2018-02-01

申请号：US15606388

申请日：2017-05-26

Applicant: Lumileds LLC

Inventor： Zhihua Song ,  Wouter Soer ,  Ron Bonne ,  Yifeng Qiu

IPC: H05B33/08 ,  H05B39/04 ,  H03G1/00 ,  H05B37/02

CPC classification number: H05B33/0815 ,  H03G1/0005 ,  H05B33/0851 ,  H05B33/0863 ,  H05B37/02 ,  H05B39/041 ,  Y02B20/342

Abstract: Embodiments include systems, methods, and apparatuses for providing a dimming function in a single stage AC input light emitting diode (LED) driver with a controller that contains an on-chip error amplifier and an on-chip fixed reference voltage source coupled to a first input of the error amplifier. The controller controls a duty cycle of a switching transistor to cause a feedback voltage, applied to a first package input terminal, to match the reference voltage. To achieve a dimming function, a voltage across a current sense resistor in series with the LEDs is applied to a first input of a high gain differential amplifier, and a variable dimming control voltage is applied to a second input of the differential amplifier. The output of the differential amplifier is coupled to the first package input terminal. The differential amplifier input signals will be matched at the target LED current level.