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1. 发明授权

US10743380B2 Light emitting diode driving device and light emitting diode backlight module 有权
公开(公告)号：US10743380B2
公开(公告)日：2020-08-11
申请号：US16234531
申请日：2018-12-27
申请人： Power Forest Technology Corporation
发明人： Yang-Tai Tseng
IPC分类号： H05B33/08 , H05B45/10 , H02M1/08 , H05B45/37 , H02M1/00
摘要： A light emitting diode driving device and a light emitting diode backlight module are provided. A current is provided to a filter circuit by a controllable current source controlled by a dimming signal, so that the filter circuit generates a corresponding dimming voltage to control current flowing through a LED unit to dim the LED unit.

2. 发明申请

US20200120769A1 LIGHT EMITTING DIODE DRIVING DEVICE AND LIGHT EMITTING DIODE BACKLIGHT MODULE 审中-公开
公开(公告)号：US20200120769A1
公开(公告)日：2020-04-16
申请号：US16234531
申请日：2018-12-27
申请人： Power Forest Technology Corporation
发明人： Yang-Tai Tseng
IPC分类号： H05B33/08 , H02M1/08
摘要： A light emitting diode driving device and a light emitting diode backlight module are provided. A current is provided to a filter circuit by a controllable current source controlled by a dimming signal, so that the filter circuit generates a corresponding dimming voltage to control current flowing through a LED unit to dim the LED unit.

3. 发明申请

US20140339993A1 LIGHT EMITTING DIODE DRIVING APPARATUS AND LIGHT EMITTING DIODE BACKLIGHT SYSTEM USING THE SAME 有权
标题翻译：使用它的发光二极管驱动装置和发光二极管背光系统
公开(公告)号：US20140339993A1
公开(公告)日：2014-11-20
申请号：US13956383
申请日：2013-08-01
申请人： Power Forest Technology Corporation
发明人： Yang-Tai Tseng
IPC分类号： G09G3/34 , H05B33/08
CPC分类号： H05B33/0845 , G09G3/3426 , H05B33/086
摘要： A light emitting diode (LED) driving apparatus and an LED backlight system using the same are provided. The backlight control circuit suitable for driving an LED string includes a complex function pin, a driving circuit and a backlight control circuit. The backlight control circuit includes a control current generating unit, a first current comparing unit and a second current comparing unit. The control current generating unit receives a dimming control signal and an enable control signal from the complex function pin to generate a control current accordingly. The first and the second current comparing units are respectively configured to compare the control current with first and second predetermined currents to respectively generate a first and a second control signals. The driving circuit determines to be turned on or off according to the second control signal, and further adjusts a luminance of the LED string according to the first control signal.
摘要翻译：提供了一种发光二极管（LED）驱动装置和使用其的LED背光系统。适用于驱动LED串的背光控制电路包括复功能引脚，驱动电路和背光控制电路。背光控制电路包括控制电流产生单元，第一电流比较单元和第二电流比较单元。控制电流产生单元接收来自复功能引脚的调光控制信号和使能控制信号，从而相应地产生控制电流。第一和第二电流比较单元分别配置为将控制电流与第一和第二预定电流进行比较，以分别产生第一和第二控制信号。驱动电路根据第二控制信号确定为接通或关断，并且还根据第一控制信号调节LED串的亮度。

4. 发明授权

US09060403B2 Light emitting diode driving apparatus and light emitting diode backlight system using the same 有权
标题翻译：发光二极管驱动装置和使用其的发光二极管背光系统
公开(公告)号：US09060403B2
公开(公告)日：2015-06-16
申请号：US13956383
申请日：2013-08-01
申请人： Power Forest Technology Corporation
发明人： Yang-Tai Tseng
IPC分类号： G05F1/00 , H05B37/02 , H05B39/04 , H05B41/36 , H05B33/08 , G09G3/34
CPC分类号： H05B33/0845 , G09G3/3426 , H05B33/086
摘要： A light emitting diode (LED) driving apparatus and an LED backlight system using the same are provided. The backlight control circuit suitable for driving an LED string includes a complex function pin, a driving circuit and a backlight control circuit. The backlight control circuit includes a control current generating unit, a first current comparing unit and a second current comparing unit. The control current generating unit receives a dimming control signal and an enable control signal from the complex function pin to generate a control current accordingly. The first and the second current comparing units are respectively configured to compare the control current with first and second predetermined currents to respectively generate a first and a second control signals. The driving circuit determines to be turned on or off according to the second control signal, and further adjusts a luminance of the LED string according to the first control signal.
摘要翻译：提供了一种发光二极管（LED）驱动装置和使用其的LED背光系统。适用于驱动LED串的背光控制电路包括复功能引脚，驱动电路和背光控制电路。背光控制电路包括控制电流产生单元，第一电流比较单元和第二电流比较单元。控制电流产生单元接收来自复功能引脚的调光控制信号和使能控制信号，从而相应地产生控制电流。第一和第二电流比较单元分别配置为将控制电流与第一和第二预定电流进行比较，以分别产生第一和第二控制信号。驱动电路根据第二控制信号确定为接通或关断，并且还根据第一控制信号调节LED串的亮度。

5. 发明授权

US09661705B1 Power conversion apparatus for decreasing number of pins 有权
公开(公告)号：US09661705B1
公开(公告)日：2017-05-23
申请号：US15172160
申请日：2016-06-03
申请人： Power Forest Technology Corporation
发明人： Yang-Tai Tseng
IPC分类号： H05B41/28 , H05B33/08
CPC分类号： H05B33/0815 , H05B33/0845 , H05B33/089
摘要： A power conversion apparatus including a power conversion circuit, a light-emitting unit and a control chip is provided. The control chip has a multi-function pin and a feedback pin, where the multi-function pin and the feedback pin respectively receive a dimming signal and a feedback signal reflecting an output current of the light-emitting unit, and the control chip determines whether to generate a PWM signal to a power switch of the power conversion circuit according to the dimming signal and the feedback signal based on a duty ratio of the dimming signal.

6. 发明授权

US09510408B1 Light emitting diode backlight module and driving apparatus thereof 有权
标题翻译：发光二极管背光模块及其驱动装置
公开(公告)号：US09510408B1
公开(公告)日：2016-11-29
申请号：US14956394
申请日：2015-12-02
申请人： Power Forest Technology Corporation
发明人： Yang-Tai Tseng
IPC分类号： H05B33/08
CPC分类号： H05B33/0815 , H05B33/0848
摘要： A LED backlight module including a LED string and a driving apparatus is provided. The driving apparatus comprises a sensing resistor, an adjustable voltage-divider circuit, a comparator, a power converter and a control circuit. The sensing resistor is coupled between a cathode of the LED string and a ground potential and generates a feedback voltage. The adjustable voltage-divider circuit generates a reference voltage according to a dividing ratio which is controlled by a first signal set and a second signal set. The comparator compares the feedback voltage and the reference voltage, and generates a control signal accordingly. The power converter provides a DC voltage to an anode of the LED string according to the control signal. The control circuit counts a disable period of a dimming signal to generate the first signal set, and counts an enable period of the dimming signal to generate the second signal set.
摘要翻译：提供了包括LED串和驱动装置的LED背光模组。驱动装置包括感测电阻器，可调节分压器电路，比较器，功率转换器和控制电路。感测电阻器耦合在LED串的阴极和接地电位之间并产生反馈电压。可调节分压器电路根据由第一信号组和第二信号组控制的分频比产生参考电压。比较器比较反馈电压和参考电压，并相应地产生一个控制信号。功率转换器根据控制信号向LED串的阳极提供直流电压。控制电路对调光信号的禁止周期进行计数以产生第一信号组，并对调光信号的使能周期进行计数，以产生第二信号组。

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