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1. 发明申请

US20130169172A1 Predictive Control of Power Converter for LED Driver 有权
标题翻译： LED驱动器电源转换器的预测控制
公开(公告)号：US20130169172A1
公开(公告)日：2013-07-04
申请号：US13339196
申请日：2011-12-28
申请人： John William Kesterson , Xiaoyan Wang , Xuecheng Jin , Enzhu Liang , Selcuk Sen
发明人： John William Kesterson , Xiaoyan Wang , Xuecheng Jin , Enzhu Liang , Selcuk Sen
IPC分类号： H05B37/02
CPC分类号： H05B33/0815 , Y02B20/346
摘要： A system controls a switching power converter to power LED strings using a predictive feedforward control mechanism. An LED controller determines programmed current levels and duty cycles for driving LED strings. The LED controller determines a predicted load for a subsequent cycle of a switching power converter driving the LED strings based on the programmed current levels and duty cycles. A power conversion controller uses the predicted load information to control switching of the switching power converter. This improves the dynamic response of the switching converter to changing load conditions, thereby improving overall power efficiency and performance of the system.
摘要翻译：系统使用预测前馈控制机制控制开关功率转换器为LED串供电。 LED控制器确定用于驱动LED串的编程电流电平和占空比。 LED控制器基于编程的电流电平和占空比确定驱动LED串的开关功率转换器的后续周期的预测负载。电力转换控制器使用预测负载信息来控制开关功率转换器的开关。这改善了开关转换器对变化的负载条件的动态响应，从而提高了系统的整体功率效率和性能。

2. 发明授权

US08791647B2 Predictive control of power converter for LED driver 有权
标题翻译： LED驱动器功率转换器的预测控制
公开(公告)号：US08791647B2
公开(公告)日：2014-07-29
申请号：US13339196
申请日：2011-12-28
申请人： John William Kesterson , Xiaoyan Wang , Xuecheng Jin , Enzhu Liang , Selcuk Sen
发明人： John William Kesterson , Xiaoyan Wang , Xuecheng Jin , Enzhu Liang , Selcuk Sen
IPC分类号： G05F1/00
CPC分类号： H05B33/0815 , Y02B20/346
摘要： A system controls a switching power converter to power LED strings using a predictive feedforward control mechanism. An LED controller determines programmed current levels and duty cycles for driving LED strings. The LED controller determines a predicted load for a subsequent cycle of a switching power converter driving the LED strings based on the programmed current levels and duty cycles. A power conversion controller uses the predicted load information to control switching of the switching power converter. This improves the dynamic response of the switching converter to changing load conditions, thereby improving overall power efficiency and performance of the system.
摘要翻译：系统使用预测前馈控制机制控制开关功率转换器为LED串供电。 LED控制器确定用于驱动LED串的编程电流电平和占空比。 LED控制器基于编程的电流电平和占空比确定驱动LED串的开关功率转换器的后续周期的预测负载。电力转换控制器使用预测负载信息来控制开关功率转换器的开关。这改善了开关转换器对变化的负载条件的动态响应，从而提高了系统的整体功率效率和性能。

3. 发明授权

US08710752B2 Adaptive switch mode LED system 有权
标题翻译：自适应开关模式LED系统
公开(公告)号：US08710752B2
公开(公告)日：2014-04-29
申请号：US13040229
申请日：2011-03-03
申请人： Xuecheng Jin , Minjong Kim , Enzhu Liang , John William Kesterson , Xiaoyan Wang
发明人： Xuecheng Jin , Minjong Kim , Enzhu Liang , John William Kesterson , Xiaoyan Wang
IPC分类号： H05B37/00
CPC分类号： H05B33/0815 , H05B33/0827 , H05B33/0851
摘要： A system that provides an intelligent approach to driving multiple strings of LEDs. A processing device determines an optimal current level for each LED string from a limited set of allowed currents. The processing device also determines a PWM duty cycle for driving the LEDs in each LED string to provide precise brightness control over the LED string. The settings for the current level and duty cycle are transmitted to an LED driver for regulating the current and on-off times of the LED strings. Beneficially, the system reduces the size of the LED driver while leveraging existing resources available in the processing device to operate the LEDs in a power efficient manner.
摘要翻译：提供智能方法来驱动多串LED的系统。处理装置从有限的允许电流集合确定每个LED串的最佳电流电平。处理装置还确定用于驱动每个LED串中的LED的PWM占空比，以提供对LED串的精确亮度控制。当前电平和占空比的设置被传送到LED驱动器，用于调节LED串的电流和开关时间。有利的是，该系统在利用处理装置中可利用的现有资源以功率有效的方式来操作LED的同时减小了LED驱动器的尺寸。

4. 发明申请

US20120223648A1 Adaptive Switch Mode LED System 有权
标题翻译：自适应开关模式LED系统
公开(公告)号：US20120223648A1
公开(公告)日：2012-09-06
申请号：US13040229
申请日：2011-03-03
申请人： Xuecheng Jin , Minjong Kim , Enzhu Liang , John William Kesterson , Xiaoyan Wang
发明人： Xuecheng Jin , Minjong Kim , Enzhu Liang , John William Kesterson , Xiaoyan Wang
IPC分类号： H05B37/02
CPC分类号： H05B33/0815 , H05B33/0827 , H05B33/0851
摘要： A system that provides an intelligent approach to driving multiple strings of LEDs. A processing device determines an optimal current level for each LED string from a limited set of allowed currents. The processing device also determines a PWM duty cycle for driving the LEDs in each LED string to provide precise brightness control over the LED string. The settings for the current level and duty cycle are transmitted to an LED driver for regulating the current and on-off times of the LED strings. Beneficially, the system reduces the size of the LED driver while leveraging existing resources available in the processing device to operate the LEDs in a power efficient manner.
摘要翻译：提供智能方法来驱动多串LED的系统。处理装置从有限的允许电流集合确定每个LED串的最佳电流电平。处理装置还确定用于驱动每个LED串中的LED的PWM占空比，以提供对LED串的精确亮度控制。当前电平和占空比的设置被传送到LED驱动器，用于调节LED串的电流和开关时间。有利的是，该系统在利用处理装置中可利用的现有资源以功率有效的方式来操作LED的同时减小了LED驱动器的尺寸。

5. 发明授权

US07382308B1 Reference buffer using current mirrors and source followers to generate reference voltages 有权
标题翻译：参考缓冲器使用电流镜和源跟随器来产生参考电压
公开(公告)号：US07382308B1
公开(公告)日：2008-06-03
申请号：US11676026
申请日：2007-02-16
申请人： Enzhu Liang , Xuecheng Jin
发明人： Enzhu Liang , Xuecheng Jin
IPC分类号： H03M1/38
CPC分类号： G05F3/262 , H03M1/168
摘要： A reference buffer includes a first current mirror, a second current mirror, a first source follower coupled in series to a branch of the first current mirror and receiving a first initial reference voltage and outputting a first reference voltage, a second source follower coupled in series to a branch of the second current mirror and receiving a second initial reference voltage and outputting a second reference voltage, and a resistor coupled between a first node and a second node outputting the first and second reference voltages, respectively. The first node is disposed between the first current mirror and the first source follower and the second node is disposed between the second current mirror and the second source follower. The voltage difference between the first reference voltage and the first initial reference voltage is substantially same as that between the second reference voltage and the second initial reference voltage.
摘要翻译：参考缓冲器包括第一电流镜，第二电流镜，与第一电流镜的分支串联耦合的第一源极跟随器，并接收第一初始参考电压并输出第一参考电压，串联耦合的第二源极跟随器耦合到第二电流镜的分支并且接收第二初始参考电压并输出第二参考电压，以及耦合在第一节点和第二节点之间的电阻器，分别输出第一和第二参考电压。第一节点设置在第一电流镜和第一源极跟随器之间，第二节点设置在第二电流镜和第二源极跟随器之间。第一参考电压和第一初始参考电压之间的电压差基本上与第二参考电压和第二初始参考电压之间的电压差相同。

6. 发明申请

US20110096572A1 LOW POWER CONSUMPTION START-UP CIRCUIT WITH DYNAMIC SWITCHING 有权
标题翻译：具有动态切换功能的低功耗启动电路
公开(公告)号：US20110096572A1
公开(公告)日：2011-04-28
申请号：US12907777
申请日：2010-10-19
申请人： Enzhu Liang , Jiang Chen , Xuecheng Jin
发明人： Enzhu Liang , Jiang Chen , Xuecheng Jin
IPC分类号： H02M3/335
CPC分类号： H02M1/36 , H02M3/33523 , H02M2001/0006
摘要： A start-up circuit in a switch-mode power converter that employs a Zener diode to provide a reference voltage to reduce the power consumption and the size of the start-up circuit. The start-up circuit also includes a coarse current source and a coarse reference voltage signal generator for producing current and reference voltage for initial startup operation of a bandgap circuit. The reference signal and current from coarse current source and the reference voltage signal generator are subject to large process, voltage and temperature (PVT) variations or susceptible to noise from the power supply, and hence, these signals are used temporarily during start-up and replaced with signals from higher performance components. After bandgap circuit becomes operational, the start-up receives voltage reference signal from the bandgap circuit to more accurately detect undervoltage lockout conditions.
摘要翻译：开关电源转换器中的启动电路采用齐纳二极管来提供参考电压，以降低功耗和起动电路的尺寸。启动电路还包括粗电流源和用于产生用于带隙电路的初始启动操作的电流和参考电压的粗略参考电压信号发生器。来自粗电流源和参考电压信号发生器的参考信号和电流受到大的工艺，电压和温度（PVT）变化或易受电源噪声影响，因此这些信号在启动期间暂时使用，取代了来自更高性能组件的信号。带隙电路工作后，启动接收来自带隙电路的电压参考信号，以更准确地检测欠压锁定条件。

7. 发明授权

US08710753B2 High performance adaptive switched LED driver 有权
标题翻译：高性能自适应切换LED驱动器
公开(公告)号：US08710753B2
公开(公告)日：2014-04-29
申请号：US13314103
申请日：2011-12-07
申请人： Minjong Kim , Enzhu Liang , Xuecheng Jin
发明人： Minjong Kim , Enzhu Liang , Xuecheng Jin
IPC分类号： H05B37/02
CPC分类号： H05B33/0815 , H05B33/0824 , H05B37/02
摘要： An LED driver controls current through an LED string. The LED driver generates a boosted PWM signal to drive a PWM transistor in the LED current path such that the PWM transistor maintains a substantially constant VGS, thus minimizing turn-on impedance of the PWM transistor. A current mirror circuit controls peak LED current when the PWM transistor is on. A trimming circuit includes a set of programmable switches to couple or decouple trimming transistor from the LED current path, and allowing for fine calibration of the LED current. By maintaining a low resistance and compensating for current mismatch in the LED current path, the LED driver provides efficient power performance and robustness that is particularly beneficial in high current applications.
摘要翻译： LED驱动器通过LED灯串控制电流。 LED驱动器产生升高的PWM信号以驱动LED电流路径中的PWM晶体管，使得PWM晶体管保持基本上恒定的VGS，从而最小化PWM晶体管的导通阻抗。当PWM晶体管导通时，电流镜电路控制峰值LED电流。修整电路包括一组可编程开关，用于将修整晶体管与LED电流路径耦合或去耦，并允许精确校准LED电流。通过保持低电阻并补偿LED电流路径中的电流失配，LED驱动器提供了有效的功率性能和鲁棒性，这在大电流应用中特别有益。

8. 发明授权

US08581568B2 Low power consumption start-up circuit with dynamic switching 有权
标题翻译：具有动态切换功能的低功耗启动电路
公开(公告)号：US08581568B2
公开(公告)日：2013-11-12
申请号：US12907777
申请日：2010-10-19
申请人： Enzhu Liang , Jiang Chen , Xuecheng Jin
发明人： Enzhu Liang , Jiang Chen , Xuecheng Jin
IPC分类号： G05F3/16
CPC分类号： H02M1/36 , H02M3/33523 , H02M2001/0006
摘要： A start-up circuit in a switch-mode power converter that employs a Zener diode to provide a reference voltage to reduce the power consumption and the size of the start-up circuit. The start-up circuit also includes a coarse current source and a coarse reference voltage signal generator for producing current and reference voltage for initial startup operation of a bandgap circuit. The reference signal and current from coarse current source and the reference voltage signal generator are subject to large process, voltage and temperature (PVT) variations or susceptible to noise from the power supply, and hence, these signals are used temporarily during start-up and replaced with signals from higher performance components. After bandgap circuit becomes operational, the start-up receives voltage reference signal from the bandgap circuit to more accurately detect undervoltage lockout conditions.
摘要翻译：开关电源转换器中的启动电路采用齐纳二极管来提供参考电压，以降低功耗和起动电路的尺寸。启动电路还包括粗电流源和用于产生用于带隙电路的初始启动操作的电流和参考电压的粗略参考电压信号发生器。来自粗电流源和参考电压信号发生器的参考信号和电流受到大的工艺，电压和温度（PVT）变化或易受电源噪声影响，因此这些信号在启动期间暂时使用，取代了来自更高性能组件的信号。带隙电路工作后，启动接收来自带隙电路的电压参考信号，以更准确地检测欠压锁定条件。

9. 发明申请

US20130147374A1 HIGH PERFORMANCE ADAPTIVE SWITCHED LED DRIVER 有权
标题翻译：高性能自适应开关LED驱动器
公开(公告)号：US20130147374A1
公开(公告)日：2013-06-13
申请号：US13314103
申请日：2011-12-07
申请人： Minjong Kim , Enzhu Liang , Xuecheng Jin
发明人： Minjong Kim , Enzhu Liang , Xuecheng Jin
IPC分类号： H05B37/02
CPC分类号： H05B33/0815 , H05B33/0824 , H05B37/02
摘要： An LED driver controls current through an LED string. The LED driver generates a boosted PWM signal to drive a PWM transistor in the LED current path such that the PWM transistor maintains a substantially constant VGS, thus minimizing turn-on impedance of the PWM transistor. A current mirror circuit controls peak LED current when the PWM transistor is on. A trimming circuit includes a set of programmable switches to couple or decouple trimming transistor from the LED current path, and allowing for fine calibration of the LED current. By maintaining a low resistance and compensating for current mismatch in the LED current path, the LED driver provides efficient power performance and robustness that is particularly beneficial in high current applications.
摘要翻译： LED驱动器通过LED灯串控制电流。 LED驱动器产生升高的PWM信号以驱动LED电流路径中的PWM晶体管，使得PWM晶体管保持基本上恒定的VGS，从而最小化PWM晶体管的导通阻抗。当PWM晶体管导通时，电流镜电路控制峰值LED电流。修整电路包括一组可编程开关，用于将修整晶体管与LED电流路径耦合或去耦，并允许精确校准LED电流。通过保持低电阻并补偿LED电流路径中的电流失配，LED驱动器提供了有效的功率性能和鲁棒性，这在大电流应用中特别有益。

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