公开(公告)号：US20140265888A1

公开(公告)日：2014-09-18

申请号：US13828703

申请日：2013-03-14

Applicant: CREE, INC.

Inventor： Ashish Ekbote

IPC: H05B37/02 ,  H05B33/08

CPC classification number: H05B33/0809

Abstract: A lighting apparatus includes an input power terminal, a light source element coupled to the input power terminal, and a current bleeder module that is connected to the input power terminal and is configured to draw a current from the input power terminal responsive to a phase cut input power signal received at the input power terminal during a first portion of a period of the phase cut input power signal and is configured as an open circuit so as not to draw current from the input power terminal during a second portion of the period of the phase cut input power signal.

Abstract translation: 照明装置包括输入电源端子，耦合到输入电源端子的光源元件和连接到输入电源端子的电流泄放模块，并且被配置为响应于相切而从输入电源端子吸取电流 在相位切断输入功率信号的周期的第一部分期间在输入电源端子接收的输入功率信号，并且被配置为开路，以便在所述相位切换输入功率信号的周期的第二部分期间不从所述输入电力端子抽取电流 相切输入功率信号。

公开(公告)号：US10348974B2

公开(公告)日：2019-07-09

申请号：US15665573

申请日：2017-08-01

Applicant: Cree, Inc.

Inventor： Daniel J. Pope ,  Michael James Harris ,  John Roberts ,  Ashish Ekbote ,  Robert D. Underwood

IPC: F21K9/00 ,  H03K7/08 ,  F21V23/00 ,  F21V23/04 ,  G03B15/03 ,  G03B17/00 ,  H03K3/017 ,  H04N5/235 ,  H05B33/08 ,  H05B37/02 ,  F21Y115/10

Abstract: An LED-based lighting fixture sets or adjusts a parameter of a drive signal that is used to drive its LEDs to be more compatible with the camera system; the camera system sets or adjusts an image capture parameter to be more compatible with the LED-based lighting fixture, or a combination thereof. The drive signal may be a PWM signal with a variable PWM frequency and/or duty cycle, a variable DC signal, or any combination thereof. The parameter of the drive signal that may be set or adjusted includes, but is not limited to, a PWM period, PWM frequency, PWM duty cycle, amplitude of the active and inactive portions of the PWM signal, and the like. The image capture parameter that may be adjusted includes, but is not limited to, frame rate, frame period, integration time, gain, shutter type (i.e. rolling shutter, global shutter, etc.), and the like.

公开(公告)号：US20150312974A1

公开(公告)日：2015-10-29

申请号：US14292001

申请日：2014-05-30

Applicant: Cree, Inc.

Inventor： Qingcong Hu ,  Ashish Ekbote

IPC: H05B33/08

CPC classification number: F21K9/20 ,  F21K9/23 ,  F21K9/64 ,  F21S8/088 ,  F21V3/00 ,  F21V7/0066 ,  F21V14/04 ,  F21V17/02 ,  F21V23/007 ,  F21V23/06 ,  F21V29/503 ,  F21V29/773 ,  F21W2131/10 ,  F21W2131/103 ,  F21Y2101/00 ,  F21Y2107/30 ,  F21Y2115/10 ,  H01R43/00 ,  H05B33/08 ,  H05B33/0815 ,  H05B33/0827 ,  H05B33/0848 ,  H05B33/089 ,  Y02B20/341 ,  Y02B20/347

Abstract: A SEPIC driver circuit with low input current ripple is disclosed. Embodiments of the present invention provide a driver circuit that accommodates universal input, has a wide output voltage range and good efficiency. An LED lighting system using such as circuit is also disclosed. In at least some embodiments, the circuit is configured as a single-ended primary inductor converter circuit using a magnetic element, and a floating capacitor is connected between the input winding and the output winding of the magnetic element. In some embodiments, an inductor is also included at the DC input to the circuit. An output rectifier such as a diode can also be connected to the output winding of the magnetic element, and an output capacitor can be connected across the output of the circuit. An FET, a bipolar transistor, or a plurality of FETs can be used as the switching device.

Abstract translation: 公开了具有低输入电流纹波的SEPIC驱动电路。 本发明的实施例提供一种适应通用输入的驱动电路，具有宽的输出电压范围和良好的效率。 还公开了使用诸如电路的LED照明系统。 在至少一些实施例中，电路被配置为使用磁性元件的单端初级电感器转换器电路，并且浮置电容器连接在输入绕组和磁性元件的输出绕组之间。 在一些实施例中，电感器也包括在电路的DC输入端。 诸如二极管的输出整流器也可以连接到磁性元件的输出绕组，并且输出电容器可以跨越电路的输出端连接。 可以使用FET，双极晶体管或多个FET作为开关器件。

公开(公告)号：US20180041681A1

公开(公告)日：2018-02-08

申请号：US15665573

申请日：2017-08-01

Applicant: Cree, Inc.

Inventor： Daniel J. Pope ,  Michael James Harris ,  John Roberts ,  Ashish Ekbote ,  Robert D. Underwood

IPC: H04N5/235 ,  H05B33/08 ,  H03K7/08 ,  H03K3/017 ,  G03B15/03 ,  F21V23/04

CPC classification number: H04N5/2354 ,  F21K9/00 ,  F21V23/003 ,  F21V23/0464 ,  F21Y2115/10 ,  G03B15/03 ,  G03B17/00 ,  G03B2206/00 ,  G03B2215/0567 ,  G03B2215/0596 ,  H03K3/017 ,  H03K7/08 ,  H04N5/2351 ,  H04N5/2352 ,  H04N5/2357 ,  H05B33/0815 ,  H05B33/0827 ,  H05B37/0272

Abstract: An LED-based lighting fixture sets or adjusts a parameter of a drive signal that is used to drive its LEDs to be more compatible with the camera system; the camera system sets or adjusts an image capture parameter to be more compatible with the LED-based lighting fixture, or a combination thereof. The drive signal may be a PWM signal with a variable PWM frequency and/or duty cycle, a variable DC signal, or any combination thereof. The parameter of the drive signal that may be set or adjusted includes, but is not limited to, a PWM period, PWM frequency, PWM duty cycle, amplitude of the active and inactive portions of the PWM signal, and the like. The image capture parameter that may be adjusted includes, but is not limited to, frame rate, frame period, integration time, gain, shutter type (i.e. rolling shutter, global shutter, etc.), and the like.

公开(公告)号：US09328876B2

公开(公告)日：2016-05-03

申请号：US14219627

申请日：2014-03-19

Applicant: Cree, Inc.

Inventor： Kurt Wilcox ,  Bernd Keller ,  James Ibbetson ,  Ashish Ekbote ,  Nalini Gupta

IPC: F21K99/00 ,  F21Y101/02 ,  F21Y103/00 ,  F21Y113/00

CPC classification number: F21K9/56 ,  F21K9/27 ,  F21K9/60 ,  F21K9/64 ,  F21Y2103/10 ,  F21Y2113/17 ,  F21Y2115/10

Abstract: A LED lamp includes a plurality of red LEDs and a plurality of blue LEDs, a phosphor covering at least the plurality of blue LEDs, where the lamp has an LPW of at least 200 in a steady state operation.

Abstract translation: LED灯包括多个红色LED和多个蓝色LED，至少覆盖多个蓝色LED的荧光体，其中灯在稳态操作中具有至少200的LPW。

公开(公告)号：US20150357899A1

公开(公告)日：2015-12-10

申请号：US14296196

申请日：2014-06-04

Applicant: Cree, Inc.

Inventor： Ashish Ekbote ,  Mike Walters

IPC: H02M1/08 ,  H02M3/335 ,  H05B33/08 ,  H02M3/156

CPC classification number: H05B33/0815 ,  H02M1/4225 ,  H02M1/4258 ,  H02M3/156 ,  H02M3/158 ,  H02M7/217 ,  H02M7/2176 ,  H02M2001/0025 ,  Y02B20/346 ,  Y02B70/126

Abstract: A switched mode power supply may include circuitry configured to output a bias signal that turns off and on switching circuitry of the switched mode power supply. The circuitry may wait for a first time period determined by the bias signal, and output the bias signal to turn off the switching circuitry when the time period expires. In addition or alternatively, the circuitry may begin waiting for a second time period when the bias signal turns off the switching circuitry. The circuitry may turn on the switching circuitry either when energy in inductive storage circuitry is depleted or when the second time period expires.

Abstract translation: 开关模式电源可以包括被配置为输出偏置信号的电路，所述偏置信号关断和开关模式电源的开关电路。 电路可以等待由偏置信号确定的第一时间段，并且当时间段到期时输出偏置信号以关断开关电路。 另外或替代地，当偏置信号关断开关电路时，电路可以开始等待第二时间段。 当电感性存储电路中的能量耗尽时或者当第二时间段到期时，该电路可以导通开关电路。

公开(公告)号：US09173258B2

公开(公告)日：2015-10-27

申请号：US13828703

申请日：2013-03-14

Applicant: Cree, Inc.

Inventor： Ashish Ekbote

IPC: H05B37/02 ,  H05B39/04 ,  H05B41/36 ,  H05B33/08

CPC classification number: H05B33/0809

Abstract: A lighting apparatus includes an input power terminal, a light source element coupled to the input power terminal, and a current bleeder module that is connected to the input power terminal and is configured to draw a current from the input power terminal responsive to a phase cut input power signal received at the input power terminal during a first portion of a period of the phase cut input power signal and is configured as an open circuit so as not to draw current from the input power terminal during a second portion of the period of the phase cut input power signal.

Abstract translation: 照明装置包括输入电源端子，耦合到输入电源端子的光源元件和连接到输入电源端子的电流泄放模块，并且被配置为响应于相切而从输入电源端子吸取电流 在相位切断输入功率信号的周期的第一部分期间在输入电源端子接收的输入功率信号，并且被配置为开路，以便在所述相位切换输入功率信号的周期的第二部分期间不从所述输入电力端子抽取电流 相切输入功率信号。