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公开(公告)号：US09907135B2
公开(公告)日：2018-02-27
申请号：US15410907
申请日：2017-01-20
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Jeffrey Scott Farris , Michael David McCormick , Jason Ryan Thompson
CPC classification number: H05B33/086 , G02B27/01 , G02B27/0101 , G02B2027/0112 , G02B2027/0118 , H02J7/0068 , H02J7/007 , H05B33/0818 , H05B33/0827 , H05B33/089 , H05B37/0218 , Y10T307/625
Abstract: For controlling a level of luminance produced by a color light-emitting diode (LED) array, a method includes: for a predetermined flux bit-slice period, activating a color enable signal to select a primary color LED and to select a predetermined light flux magnitude set-point; selectively charging an energy storage device and discharging the energy storage device through the selected primary color LED to generate a light flux output during the flux bit-slice period; adjusting a rate of selectively charging the energy storage device to maintain a magnitude of the light flux output at the predetermined light flux magnitude set-point during the flux bit-slice period; and adjusting the predetermined light flux magnitude set-point over the life of the selected LED as the selected LED ages as a function of an anode-to-cathode voltage drop across the selected LED for a given magnitude of current flowing through the selected LED.
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公开(公告)号：US20170135164A1
公开(公告)日：2017-05-11
申请号：US15410907
申请日：2017-01-20
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Jeffrey Scott Farris , Michael David McCormick , Jason Ryan Thompson
CPC classification number: H05B33/086 , G02B27/01 , G02B27/0101 , G02B2027/0112 , G02B2027/0118 , H02J7/0068 , H02J7/007 , H05B33/0818 , H05B33/0827 , H05B33/089 , H05B37/0218 , Y10T307/625
Abstract: For controlling a level of luminance produced by a color light-emitting diode (LED) array, a method includes: for a predetermined flux bit-slice period, activating a color enable signal to select a primary color LED and to select a predetermined light flux magnitude set-point; selectively charging an energy storage device and discharging the energy storage device through the selected primary color LED to generate a light flux output during the flux bit-slice period; adjusting a rate of selectively charging the energy storage device to maintain a magnitude of the light flux output at the predetermined light flux magnitude set-point during the flux bit-slice period; and adjusting the predetermined light flux magnitude set-point over the life of the selected LED as the selected LED ages as a function of an anode-to-cathode voltage drop across the selected LED for a given magnitude of current flowing through the selected LED.
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公开(公告)号：US09554435B2
公开(公告)日：2017-01-24
申请号：US14030746
申请日：2013-09-18
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Jeffrey Scott Farris , Michael David McCormick , Jason Ryan Thompson
CPC classification number: H05B33/086 , G02B27/01 , G02B27/0101 , G02B2027/0112 , G02B2027/0118 , H02J7/0068 , H02J7/007 , H05B33/0818 , H05B33/0827 , H05B33/089 , H05B37/0218 , Y10T307/625
Abstract: Light flux levels sensed from a color LED array control both current availability to the array and disable/re-enable a current bypass switch to shunt stored-energy current to or away from a selected LED. In continuous mode, a single flux pulse is created for the duration of a pre-established period. Feedback from the flux sensor pulses current to an energy storage device to maintain the light flux at a predetermined set-point. A particular dimming level is achieved by establishing both the pulse period and the flux magnitude. In discontinuous mode, one or more short flux pulses are created. Both the turn-on and the turn-off time of each flux pulse is controlled by alternately removing and then re-establishing a current shunt from the energy storage device to ground. Flux pulse magnitude is controlled by recognizing when the flux pulse has reached a predetermined set-point and re-establishing the current shunt to abruptly turn off current to the selected LED.
Abstract translation: 从彩色LED阵列检测的光通量水平控制阵列的当前可用性，并禁用/重新启用当前旁路开关以将存储的能量电流分流到或远离所选择的LED。 在连续模式下，在预先建立的周期内创建单个磁通脉冲。 来自磁通传感器的反馈脉冲电流到能量存储装置，以将光通量保持在预定的设定点。 通过建立脉冲周期和通量幅度来实现特定的调光水平。 在不连续模式下，产生一个或多个短通量脉冲。 通过从能量存储装置交替地去除并重新建立电流分流到地来控制每个磁通脉冲的导通和关断时间。 通过识别通量脉冲何时达到预定的设定点并且重新建立电流分路以突然关闭所选LED的电流来控制通量脉冲幅度。
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公开(公告)号：US20140085731A1
公开(公告)日：2014-03-27
申请号：US14030746
申请日：2013-09-18
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Jeffrey Scott Farris , Michael David McCormick , Jason Ryan Thompson
CPC classification number: H05B33/086 , G02B27/01 , G02B27/0101 , G02B2027/0112 , G02B2027/0118 , H02J7/0068 , H02J7/007 , H05B33/0818 , H05B33/0827 , H05B33/089 , H05B37/0218 , Y10T307/625
Abstract: Light flux levels sensed from a color LED array control both current availability to the array and disable/re-enable a current bypass switch to shunt stored-energy current to or away from a selected LED. In continuous mode, a single flux pulse is created for the duration of a pre-established period. Feedback from the flux sensor pulses current to an energy storage device to maintain the light flux at a predetermined set-point. A particular dimming level is achieved by establishing both the pulse period and the flux magnitude. In discontinuous mode, one or more short flux pulses are created. Both the turn-on and the turn-off time of each flux pulse is controlled by alternately removing and then re-establishing a current shunt from the energy storage device to ground. Flux pulse magnitude is controlled by recognizing when the flux pulse has reached a predetermined set-point and re-establishing the current shunt to abruptly turn off current to the selected LED.
Abstract translation: 从彩色LED阵列检测的光通量水平控制阵列的当前可用性，并禁用/重新启用当前旁路开关以将存储的能量电流分流到或远离所选择的LED。 在连续模式下，在预先建立的周期内创建单个磁通脉冲。 来自磁通传感器的反馈脉冲电流到能量存储装置，以将光通量保持在预定的设定点。 通过建立脉冲周期和通量幅度来实现特定的调光水平。 在不连续模式下，产生一个或多个短通量脉冲。 通过从能量存储装置交替地去除并重新建立电流分流到地来控制每个磁通脉冲的导通和关断时间。 通过识别通量脉冲何时达到预定的设定点并且重新建立电流分路以突然关闭所选LED的电流来控制通量脉冲幅度。
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