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公开(公告)号：US09913327B2
公开(公告)日：2018-03-06
申请号：US14789520
申请日：2015-07-01
Applicant: Cree, Inc.
Inventor： Daniel Pope , Jun Zhang , Michael B. Gilliom
CPC classification number: H05B33/0815 , H05B33/0845 , H05B33/086 , H05B37/0218 , H05B37/0227 , H05B37/0254 , Y02B20/46
Abstract: According to one aspect, a control system for an LED luminaire includes a dimming control circuit that develops an analog dimming command signal that is variable between zero volts and ten volts to command LED brightness. The control system further includes a modulation circuit coupled to the dimming control circuit. The modulation circuit modifies the analog dimming command signal so as to include digital data for further commanding a parameter of LED operation.
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公开(公告)号：US09735617B2
公开(公告)日：2017-08-15
申请号：US14694669
申请日：2015-04-23
Applicant: Cree, Inc.
Inventor： Daniel Pope
CPC classification number: H02J9/061 , H05B33/0815 , H05B33/0845 , H05B33/0854 , H05B37/02
Abstract: According to one aspect, a load control system responsive to electric power from either a first power source or a second power source operable during first and second time periods, respectively, comprises a first circuit responsive to the first and second power sources to develop power waveforms having different characteristics during the first and second time periods. The load control system further includes a second circuit coupled to the first circuit and responsive to the characteristics of the power developed by the first circuit for developing first and second different outputs during the first and second time periods, respectively.
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13.发明授权Lighting apparatus with variable current switching frequency and methods of operating same 有权具有可变电流开关频率的照明装置及其操作方法公开(公告)号：US09585218B2
公开(公告)日：2017-02-28
申请号：US14465431
申请日：2014-08-21
Applicant: Cree, Inc.
Inventor： Daniel Pope , Xiuge Yang
CPC classification number: H05B33/0845 , H05B33/0818 , H05B37/0281 , Y02B20/347 , Y02B20/42
Abstract: An apparatus includes a current modulation circuit configured to modulate a current in at least one light-emitting device responsive to a pulse width modulated control signal and a control circuit configured to control a pulse width of the pulse width modulated control signal responsive to a first control input and to control a frequency of the pulse width modulated control signal responsive to a second control input. The first control input may include, for example, a current control input, and the second control input may include a light intensity control input, such as a dimming input. The control circuit may be configured to increase the frequency responsive to a change in the light intensity control input corresponding to a decrease in light intensity and to decrease the frequency responsive to a change in the light intensity control input corresponding to an increase in light intensity.
Abstract translation: 一种装置，包括：电流调制电路，被配置为响应于脉冲宽度调制控制信号调制至少一个发光器件中的电流;以及控制电路，被配置为响应于第一控制来控制脉宽调制控制信号的脉冲宽度 并且响应于第二控制输入来控制脉宽调制控制信号的频率。 第一控制输入可以包括例如电流控制输入，并且第二控制输入可以包括诸如调光输入的光强度控制输入。 控制电路可以被配置为响应于光强度控制输入的变化而响应于光强度的降低而增加频率，并且响应于光强度的增加对光强度控制输入的变化而降低频率。
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公开(公告)号：US09866117B2
公开(公告)日：2018-01-09
申请号：US13792457
申请日：2013-03-11
Applicant: Cree, Inc.
Inventor： Yuequan Hu , Daniel Pope
CPC classification number: H02M3/158 , H02M1/4258 , H02M3/157 , H02M2001/007 , H05B33/0815 , H05B33/0827 , Y02B20/347 , Y02B70/126
Abstract: A power supply circuit includes a pre-regulator configured to receive an input voltage and to generate an output voltage, and a switching current regulator coupled to an output of the pre-regulator and configured to regulate a level of current supplied to an output load. The switching current regulator is controlled by a switching signal having a duty cycle. The circuit further includes a controller that generates the switching signal. The controller monitors the duty cycle of the switching signal and controls a level of the output voltage generated by the pre-regulator by providing a control signal in response to the duty cycle of the switching signal.
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公开(公告)号：US09791110B2
公开(公告)日：2017-10-17
申请号：US14291829
申请日：2014-05-30
Applicant: Cree, Inc.
Inventor： Yuequan Hu , Daniel Pope , Qingcong Hu
IPC: F21K99/00 , F21V29/503 , F21V23/00 , F21V23/06 , F21V7/00 , F21V3/00 , H01R43/00 , H05B33/08 , F21V17/02 , F21K9/23 , F21W131/10 , F21S8/08 , F21V14/04 , F21V29/77 , F21Y101/00 , F21Y115/10 , F21Y107/30
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.
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Patent Agency Ranking
公开(公告)号：US09706611B2
公开(公告)日：2017-07-11
申请号：US14813308
申请日：2015-07-30
Applicant: CREE, INC.
Inventor： Mike Walters , Jason Taylor , Daniel Pope
IPC: H05B33/08
CPC classification number: H05B33/0812 , H05B33/0815 , H05B33/0872 , Y02B20/345
Abstract: A solid state lighting apparatus can include a variable color input signal configured to indicate a target color of light output from the apparatus. A string current Pulse Width Modulation (PWM) controller circuit can be coupled to the variable color input signal, where the string current PWM controller circuit can be configured to generate a plurality of PWM signals having respective variable duty cycles to enable/disable respective particular string currents for respective variable times as the variable color input signal changes.
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公开(公告)号：US09648687B2
公开(公告)日：2017-05-09
申请号：US14465580
申请日：2014-08-21
Applicant: Cree, Inc.
Inventor： Daniel Pope , Mike Walters
IPC: H05B33/08
CPC classification number: H05B33/0845 , H05B33/0815 , Y02B20/347
Abstract: An apparatus includes a plurality of series-connected current control circuits configured to control a current therethrough responsive to at least one current reference signal and to be coupled in parallel with a load, such as a string of LEDs. The apparatus further includes a voltage control circuit configured to control respective voltages across respective ones of the current control circuits. In some embodiments, the voltage control circuit may be configured to individually adjust responses of the current control circuits responsive to the voltages across the current control circuits. In further embodiments, the voltage control circuit may include respective voltage limiters coupled across respective ones of the current control circuits.
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18.发明申请VOLTAGE LEVEL SHIFTING CIRCUITS FOR SIGNAL LEVELS AND/OR POWER SUPPLY VOLTAGE LEVELS USING CONSTANT VOLTAGE CIRCUIT ELEMENTS, LIGHTING APPARATUSES AND METHODS OF OPERATING THE SAME 有权使用恒定电压电路元件的信号电平和/或电源电压电平的电压水平移动电路，照明装置及其操作方法公开(公告)号：US20160322972A1
公开(公告)日：2016-11-03
申请号：US14701025
申请日：2015-04-30
Applicant: Cree, Inc.
Inventor： Qingcong Hu , Daniel Pope
IPC: H03K19/0185 , H05B33/08
CPC classification number: H03K19/018521 , H05B33/0815 , Y02B20/346
Abstract: A level shifting circuit can include a level shifting circuit input node that can be coupled to an input signal, where the input signal can be configured to switch between discrete voltage levels in an input voltage domain. A level shifting circuit output node of the level shifting circuit can be configured to provide shifted voltage levels that are shifted relative to the input signal responsive to switching of the input signal. A constant voltage element can have a first terminal that can be coupled to the level shifting circuit input node and can have a second terminal that can be coupled to the level shifting circuit output node. The constant voltage element can be configured to provide a constant voltage level shift to the input signal to provide the shifted voltage levels responsive to switching of the input signal between the discrete voltage levels in the first voltage domain.
Abstract translation: 电平移位电路可以包括能够耦合到输入信号的电平移位电路输入节点，其中输入信号可被配置为在输入电压域中的离散电压电平之间切换。 电平移位电路的电平移动电路输出节点可以被配置为响应于输入信号的切换而提供相对于输入信号偏移的移位电压电平。 恒定电压元件可以具有可耦合到电平移位电路输入节点的第一端子，并且可以具有可耦合到电平移位电路输出节点的第二端子。 恒定电压元件可以被配置为向输入信号提供恒定的电压电平移位，以响应于第一电压域中的离散电压电平之间的输入信号的切换来提供移位的电压电平。
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19.发明申请LIGHTING APPARATUS WITH VARIABLE CURRENT SWITCHING FREQUENCY AND METHODS OF OPERATING SAME 有权具有可变电流切换频率的照明设备及其操作方法公开(公告)号：US20160057823A1
公开(公告)日：2016-02-25
申请号：US14465431
申请日：2014-08-21
Applicant: Cree, Inc.
Inventor： Daniel Pope , Xiuge Yang
CPC classification number: H05B33/0845 , H05B33/0818 , H05B37/0281 , Y02B20/347 , Y02B20/42
Abstract: An apparatus includes a current modulation circuit configured to modulate a current in at least one light-emitting device responsive to a pulse width modulated control signal and a control circuit configured to control a pulse width of the pulse width modulated control signal responsive to a first control input and to control a frequency of the pulse width modulated control signal responsive to a second control input. The first control input may include, for example, a current control input, and the second control input may include a light intensity control input, such as a dimming input. The control circuit may be configured to increase the frequency responsive to a change in the light intensity control input corresponding to a decrease in light intensity and to decrease the frequency responsive to a change in the light intensity control input corresponding to an increase in light intensity.
Abstract translation: 一种装置，包括：电流调制电路，被配置为响应于脉冲宽度调制控制信号调制至少一个发光器件中的电流;以及控制电路，被配置为响应于第一控制来控制脉宽调制控制信号的脉冲宽度 并且响应于第二控制输入来控制脉宽调制控制信号的频率。 第一控制输入可以包括例如电流控制输入，并且第二控制输入可以包括诸如调光输入的光强度控制输入。 控制电路可以被配置为响应于光强度控制输入的变化而响应于光强度的降低而增加频率，并且响应于光强度的增加对光强度控制输入的变化而降低频率。
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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。
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