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    Color Mixing for Solid State Lighting using Direct AC Drives
    1.
    发明申请
    Color Mixing for Solid State Lighting using Direct AC Drives 有权

    公开(公告)号：US20170171933A1

    公开(公告)日：2017-06-15

    申请号：US15373580

    申请日：2016-12-09

    申请人： ABL IP Holding LLC

    发明人： Towfiq Chowdhury ,  Michael Z. Gielniewski ,  Feng Chen ,  Alejandro Lopez

    IPC分类号： H05B33/08

    CPC分类号： H05B33/0857 ,  H05B33/0809 ,  H05B33/083 ,  H05B33/0845

    摘要： Techniques are described to allow a low-cost light fixture to produce light with a relatively high color rendering index (CRI) across a range of color temperatures. A rectified AC voltage may be provided to multiple groups of light-emitting diodes (LEDs) having characteristics related to a range of color temperatures and a target CRI level. The multiple groups of LEDs may be controlled based on a received control signal, such that the combined groups of LEDs produce combined light having a produced color temperature within the range of color temperatures, and having a produced CRI level that is approximately the target CRI level. In some implementations, the received control signal is modified by a modification circuit, and the multiple groups of LEDs may be controlled based on the modified control signal.

    Controlling LED current from a constant voltage source
    2.
    发明授权
    Controlling LED current from a constant voltage source 有权

    公开(公告)号：US09769894B2

    公开(公告)日：2017-09-19

    申请号：US14317621

    申请日：2014-06-27

    申请人： ABL IP Holding LLC

    发明人： Towfiq Chowdhury ,  Feng Chen

    IPC分类号： H05B33/08

    CPC分类号： H05B33/0845 ,  H05B33/0815

    摘要： An LED driver circuit provides dimming control in LED lighting applications that can accommodate an AC/DC constant voltage converter. The driver circuit provides a dimming control signal that is used to directly control the DC output current of a downstream DC/DC converter driving an LED array. The dimming control signal tracks the AC or DC output from a dimming controller such that variations in the AC or DC voltage are reflected in the dimming control signal. This dimming control signal is then provided to the downstream DC/DC converter, bypassing the AC/DC constant voltage converter to directly control dimming of the LED array. Such an arrangement lets lighting design engineers deploy the familiar and well-understood constant voltage converter topology in LED lighting applications while retaining the ability to control dimming in the LED lighting applications.

    Color mixing for solid state lighting using direct AC drives
    5.
    发明授权
    Color mixing for solid state lighting using direct AC drives 有权

    公开(公告)号：US09844114B2

    公开(公告)日：2017-12-12

    申请号：US15373580

    申请日：2016-12-09

    申请人： ABL IP Holding LLC

    发明人： Towfiq Chowdhury ,  Michael Z. Gielniewski ,  Feng Chen ,  Alejandro Lopez

    IPC分类号： H05B37/02 ,  H05B33/08

    CPC分类号： H05B33/0857 ,  H05B33/0809 ,  H05B33/083 ,  H05B33/0845

    摘要： Techniques are described to allow a low-cost light fixture to produce light with a relatively high color rendering index (CRI) across a range of color temperatures. A rectified AC voltage may be provided to multiple groups of light-emitting diodes (LEDs) having characteristics related to a range of color temperatures and a target CRI level. The multiple groups of LEDs may be controlled based on a received control signal, such that the combined groups of LEDs produce combined light having a produced color temperature within the range of color temperatures, and having a produced CRI level that is approximately the target CRI level. In some implementations, the received control signal is modified by a modification circuit, and the multiple groups of LEDs may be controlled based on the modified control signal.

    Dynamic PWM frequency control
    6.
    发明授权
    Dynamic PWM frequency control 有权

    公开(公告)号：US12022585B1

    公开(公告)日：2024-06-25

    申请号：US18093151

    申请日：2023-01-04

    申请人： ABL IP Holding, LLC

    发明人： Feng Chen ,  Towfiq Chowdhury

    IPC分类号： H05B45/325

    CPC分类号： H05B45/325

    摘要： The present disclosure provides a dynamic pulse width modulation (PWM) system that includes current frequency determination circuitry to determine a DC value of a source current, and to determine a frequency of the source current generate a plurality of pulses from an AC power source; and PWM generation circuitry to generate a first PWM signal having a first frequency based on the DC value of the current source; the PWM circuitry also to generate a second PWM signal having a second frequency based on the frequency of the current source; wherein the first frequency is less than the second frequency.

    Combination dimmable driver
    7.
    发明授权
    Combination dimmable driver 有权

    公开(公告)号：US10104731B2

    公开(公告)日：2018-10-16

    申请号：US14962968

    申请日：2015-12-08

    申请人： ABL IP Holding LLC

    发明人： Feng-Kang Hu ,  Hangyang Wang ,  Feng Chen ,  Towfiq Chowdhury ,  Charles J. Spencer

    IPC分类号： H05B33/08

    摘要： A dimmable driver for an LED light fixture allows multiple types of dimmers to be used with the light fixture. The dimmable driver may be disconnected from one type of dimmer and subsequently connected to another type of dimmer without having to replace or otherwise adjust the driver for each dimmer. Multiple types of dimmers may be connected to dimmable driver at the same time and the dimmable driver may use dimming signals from one or several of these dimmers. In some embodiments, the dimmable driver is configured to accommodate a step dimmer, a 0-10 V dimmer, and a phase-cut dimmer. Other dimmers and dimming protocols may be accommodated by the dimmable driver in alternative embodiments. Such an arrangement maximizes flexibility for lighting specifiers, contractors, and distributors while minimizing potential errors, costs, delays, and obsolete inventory.