公开(公告)号：US09303823B2

公开(公告)日：2016-04-05

申请号：US14292001

申请日：2014-05-30

Applicant: Cree, Inc.

Inventor： Qingcong Hu ,  Ashish Ekbote

IPC: H05B37/02 ,  F21K99/00 ,  F21V29/503 ,  F21V23/00 ,  F21V23/06 ,  F21V7/00 ,  F21V3/00 ,  H01R43/00 ,  H05B33/08 ,  F21Y101/02 ,  F21W131/10

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，并且浮动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：US20150312983A1

公开(公告)日：2015-10-29

申请号：US14291829

申请日：2014-05-30

Applicant: Cree, Inc.

Inventor： Yuequan Hu ,  Daniel Pope ,  Qingcong Hu

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 high efficiency driver circuit with fast response is disclosed. Embodiments of the present invention relate to an LED driver that can drive a plural number of LED strings. The driver according to example embodiments includes a voltage converter stage with a feedback loop. The driver can include a speed-up circuit, and/or an adaptive output voltage control circuit, also referred to herein as an overhead control circuit. In at least some embodiments, an input inductor helps to attenuate input current ripple, which could otherwise lead to low high-frequency winding loss in other inductors. The speed-up circuit can provide current regulation of the LED strings and prevent flickering of the LEDs. The overhead control circuit can adjust the output voltage of the driver to an optimum value to improve operating efficiency.

Abstract translation: 公开了一种具有快速响应的高效率驱动电路。 本发明的实施例涉及可驱动多个LED串的LED驱动器。 根据示例实施例的驱动器包括具有反馈回路的电压转换器级。 驱动器可以包括加速电路和/或自适应输出电压控制电路，这里也称为开销控制电路。 在至少一些实施例中，输入电感器有助于衰减输入电流纹波，否则可能导致其它电感器中的低频绕组损耗。 加速电路可以提供LED串的电流调节并防止LED的闪烁。 架空控制电路可以将驱动器的输出电压调整到最佳值，以提高运行效率。

公开(公告)号：US09130465B2

公开(公告)日：2015-09-08

申请号：US14071733

申请日：2013-11-05

Applicant: Cree, Inc.

Inventor： Qingcong Hu

IPC: H05B41/28 ,  H02M3/335 ,  H05B33/08 ,  H02M1/00

CPC classification number: H02M3/33507 ,  H02M3/335 ,  H02M2001/0009 ,  H02M2001/0058 ,  H05B33/0815 ,  H05B41/28 ,  Y02B70/1491

Abstract: Systems and methods are provided for managing switching operation of a power converter, for example and without limitation, for powering LEDs in an efficient manner. According to one aspect, a system for managing a switching operation of a power converter includes an off time control system for managing operation modes of a power converter. The off time control system includes an active device for transmitting a bias signal, where the bias signal is configured for modulating a zero diode current signal for controlling a trigger signal, and a resistive body for discharging the bias signal.

Abstract translation: 提供了用于管理功率转换器的开关操作的系统和方法，例如但不限于用于以有效的方式为LED供电。 根据一个方面，一种用于管理功率转换器的开关操作的系统包括用于管理功率转换器的操作模式的关闭时间控制系统。 关断时间控制系统包括用于发送偏置信号的有源器件，其中偏置信号被配置用于调制用于控制触发信号的零二极管电流信号，以及用于对偏置信号进行放电的电阻体。

公开(公告)号：US20150123565A1

公开(公告)日：2015-05-07

申请号：US14071733

申请日：2013-11-05

Applicant: Cree, Inc.

Inventor： Qingcong Hu

IPC: H02M3/335 ,  H05B33/08

CPC classification number: H02M3/33507 ,  H02M3/335 ,  H02M2001/0009 ,  H02M2001/0058 ,  H05B33/0815 ,  H05B41/28 ,  Y02B70/1491

Abstract: Systems and methods are provided for managing switching operation of a power converter, for example and without limitation, for powering LEDs in an efficient manner. According to one aspect, a system for managing a switching operation of a power converter includes an off time control system for managing operation modes of a power converter. The off time control system includes an active device for transmitting a bias signal, where the bias signal is configured for modulating a zero diode current signal for controlling a trigger signal, and a resistive body for discharging the bias signal.

Abstract translation: 提供了用于管理功率转换器的开关操作的系统和方法，例如但不限于用于以有效的方式为LED供电。 根据一个方面，一种用于管理功率转换器的开关操作的系统包括用于管理功率转换器的操作模式的关闭时间控制系统。 关断时间控制系统包括用于发送偏置信号的有源器件，其中偏置信号被配置用于调制用于控制触发信号的零二极管电流信号，以及用于对偏置信号进行放电的电阻体。

公开(公告)号：US20140119078A1

公开(公告)日：2014-05-01

申请号：US13664979

申请日：2012-10-31

Applicant: CREE, INC.

Inventor： Michael Walters ,  Qingcong Hu

IPC: H02M7/04

CPC classification number: H02M1/4225 ,  Y02B70/126

Abstract: A power conversion circuit includes a voltage boost circuit including a boost inductor configured to generate an output voltage in response to an input voltage, and a boost controller configured to control operation of the voltage boost circuit. The boost controller is configured to control operation of the voltage boost circuit in response to a level of current in the boost inductor.

Abstract translation: 电力转换电路包括升压电路，其包括响应于输入电压而被配置为产生输出电压的升压电感器和被配置为控制升压电路的操作的升压控制器。 升压控制器被配置为响应于升压电感器中的电流电平来控制升压电路的操作。

公开(公告)号：US20140117964A1

公开(公告)日：2014-05-01

申请号：US13734327

申请日：2013-01-04

Applicant: Cree, Inc.

Inventor： Michael Walters ,  Qingcong Hu

IPC: H02M1/00

CPC classification number: H02M7/217 ,  H02M1/08 ,  H02M3/156 ,  H02M2001/0009 ,  H02M2001/0016 ,  H05B33/0815 ,  H05B33/0848

Abstract: A circuit for generating an output current includes a control signal generating circuit that is configured to generate a control signal. The control signal is a function of a level of an analog input voltage signal, and a level of the output current is a function of a level of an analog input current signal and the level of the analog input voltage signal.

Abstract translation: 用于产生输出电流的电路包括被配置为产生控制信号的控制信号发生电路。 控制信号是模拟输入电压信号的电平的函数，输出电流的电平是模拟输入电流信号的电平和模拟输入电压信号的电平的函数。