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。

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。

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。

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。

公开(公告)号：US20110286248A1

公开(公告)日：2011-11-24

申请号：US13198358

申请日：2011-08-04

申请人： Xiaoyan Wang ,  Liang Yan ,  Junjie Zheng ,  John William Kesterson ,  Clarita Poon

发明人： Xiaoyan Wang ,  Liang Yan ,  Junjie Zheng ,  John William Kesterson ,  Clarita Poon

IPC分类号： H02M3/335

CPC分类号： H02M3/33507 ,  H02M2001/0032 ,  Y02B70/16

摘要： In a switching power converter, PWM mode and PFM mode are separated into two independent control sections with the control voltage range in each control section determined independently. Each of the PWM and PFM modulation modes cannot operate continuously beyond its boundaries, thereby forming a control gap between the two control sections within which no continuous operation is allowed. In order to supply a load condition within the control gap, the power supply operates at the two boundaries of the control gap. Transition between PWM and PFM modes occurs fast, with low output voltage ripple. No limitation needs to be imposed on the control voltage range in each of the PWM and PFM control sections, because the control parameters in the PWM and PFM control sections need not be matched to one another, due to separation of the PWM and PFM modes by the control gap.

摘要翻译： 在开关电源转换器中，PWM模式和PFM模式分为两个独立控制部分，每个控制部分的控制电压范围独立确定。 每个PWM和PFM调制模式都不能连续超过其边界，从而在两个控制部分之间形成一个控制间隙，在这两个控制部分之间不允许连续的操作。 为了在控制间隙内提供负载条件，电源在控制间隙的两个边界处工作。 PWM和PFM模式之间的转换发生得很快，输出电压波动较小。 在PWM和PFM控制部分的每个PWM控制部分的控制电压范围不受限制，因为PWM和PFM控制部分中的控制参数不需要彼此匹配，这是由于PWM和PFM模式的分离 控制差距。

公开(公告)号：US20100225293A1

公开(公告)日：2010-09-09

申请号：US12398878

申请日：2009-03-05

申请人： Xiaoyan Wang ,  Liang Yan ,  Junjie Zheng ,  John William Kesterson ,  Clarita Poon

发明人： Xiaoyan Wang ,  Liang Yan ,  Junjie Zheng ,  John William Kesterson ,  Clarita Poon

IPC分类号： G05F1/10

CPC分类号： H02M3/33507 ,  H02M2001/0032 ,  Y02B70/16

摘要： In a switching power converter, PWM mode and PFM mode are separated into two independent control sections with the control voltage range in each control section determined independently. Each of the PWM and PFM modulation modes cannot operate continuously beyond its boundaries, thereby forming a control gap between the two control sections within which no continuous operation is allowed. In order to supply a load condition within the control gap, the power supply operates at the two boundaries of the control gap. Transition between PWM and PFM modes occurs fast, with low output voltage ripple. No limitation needs to be imposed on the control voltage range in each of the PWM and PFM control sections, because the control parameters in the PWM and PFM control sections need not be matched to one another, due to separation of the PWM and PFM modes by the control gap.

摘要翻译： 在开关电源转换器中，PWM模式和PFM模式分为两个独立控制部分，每个控制部分的控制电压范围独立确定。 每个PWM和PFM调制模式都不能连续超过其边界，从而在两个控制部分之间形成一个控制间隙，在这两个控制部分之间不允许连续的操作。 为了在控制间隙内提供负载条件，电源在控制间隙的两个边界处工作。 PWM和PFM模式之间的转换发生得很快，输出电压波动较小。 在PWM和PFM控制部分的每个PWM控制部分的控制电压范围不受限制，因为PWM和PFM控制部分中的控制参数不需要彼此匹配，这是由于PWM和PFM模式的分离 控制差距。

公开(公告)号：US08199539B2

公开(公告)日：2012-06-12

申请号：US13198358

申请日：2011-08-04

申请人： Xiaoyan Wang ,  Liang Yan ,  Junjie Zheng ,  John William Kesterson ,  Clarita Poon

发明人： Xiaoyan Wang ,  Liang Yan ,  Junjie Zheng ,  John William Kesterson ,  Clarita Poon

IPC分类号： H02M3/335 ,  H02M3/157

CPC分类号： H02M3/33507 ,  H02M2001/0032 ,  Y02B70/16

摘要： In a switching power converter, PWM mode and PFM mode are separated into two independent control sections with the control voltage range in each control section determined independently. Each of the PWM and PFM modulation modes cannot operate continuously beyond its boundaries, thereby forming a control gap between the two control sections within which no continuous operation is allowed. In order to supply a load condition within the control gap, the power supply operates at the two boundaries of the control gap. Transition between PWM and PFM modes occurs fast, with low output voltage ripple. No limitation needs to be imposed on the control voltage range in each of the PWM and PFM control sections, because the control parameters in the PWM and PFM control sections need not be matched to one another, due to separation of the PWM and PFM modes by the control gap.

摘要翻译： 在开关电源转换器中，PWM模式和PFM模式分为两个独立控制部分，每个控制部分的控制电压范围独立确定。 每个PWM和PFM调制模式都不能连续超过其边界，从而在两个控制部分之间形成一个控制间隙，在这两个控制部分之间不允许连续的操作。 为了在控制间隙内提供负载条件，电源在控制间隙的两个边界处工作。 PWM和PFM模式之间的转换发生得很快，输出电压波动较小。 在PWM和PFM控制部分的每个PWM控制部分的控制电压范围不受限制，因为PWM和PFM控制部分中的控制参数不需要彼此匹配，这是由于PWM和PFM模式的分离 控制差距。

公开(公告)号：US08018743B2

公开(公告)日：2011-09-13

申请号：US12398878

申请日：2009-03-05

申请人： Xiaoyan Wang ,  Liang Yan ,  Junjie Zheng ,  John William Kesterson ,  Clarita Poon

发明人： Xiaoyan Wang ,  Liang Yan ,  Junjie Zheng ,  John William Kesterson ,  Clarita Poon

IPC分类号： H02M3/335 ,  H02M3/157

CPC分类号： H02M3/33507 ,  H02M2001/0032 ,  Y02B70/16

摘要： In a switching power converter, PWM mode and PFM mode are separated into two independent control sections with the control voltage range in each control section determined independently. Each of the PWM and PFM modulation modes cannot operate continuously beyond its boundaries, thereby forming a control gap between the two control sections within which no continuous operation is allowed. In order to supply a load condition within the control gap, the power supply operates at the two boundaries of the control gap. Transition between PWM and PFM modes occurs fast, with low output voltage ripple. No limitation needs to be imposed on the control voltage range in each of the PWM and PFM control sections, because the control parameters in the PWM and PFM control sections need not be matched to one another, due to separation of the PWM and PFM modes by the control gap.

摘要翻译： 在开关电源转换器中，PWM模式和PFM模式分为两个独立控制部分，每个控制部分的控制电压范围独立确定。 每个PWM和PFM调制模式都不能连续超过其边界，从而在两个控制部分之间形成一个控制间隙，在这两个控制部分之间不允许连续的操作。 为了在控制间隙内提供负载条件，电源在控制间隙的两个边界处工作。 PWM和PFM模式之间的转换发生得很快，输出电压波动较小。 在PWM和PFM控制部分的每个PWM控制部分的控制电压范围不受限制，因为PWM和PFM控制部分中的控制参数不需要彼此匹配，这是由于PWM和PFM模式的分离 控制差距。

公开(公告)号：US07724547B1

公开(公告)日：2010-05-25

申请号：US11847147

申请日：2007-08-29

申请人： Junjie Zheng ,  John William Kesterson

发明人： Junjie Zheng ,  John William Kesterson

IPC分类号： H02M3/335

CPC分类号： H02M3/33507 ,  H02M1/15 ,  H02M2001/385

摘要： A switch controller compensates the total on-time delay of the switch in a switching power converter. The intended on-time of the switching transistor for the present switching cycle is reduced by the time difference between the actual on-time and the intended on-time of the switching transistor in the previous switching cycle in the switching power converter. The total delay of the switch in the switching power converter, including propagation delay, switch turn-on delay, and switch turn-off delay, can be compensated in real time, cycle by cycle.

摘要翻译： 开关控制器补偿开关电源转换器中开关的总接通时间延迟。 用于当前开关周期的开关晶体管的预期接通时间通过开关功率转换器的先前开关周期中实际导通时间和开关晶体管的预期接通时间之间的时间差而减小。 开关电源转换器中的开关总延迟，包括传播延迟，开关导通延迟和开关关断延迟，可以逐个周期地实时补偿。

公开(公告)号：US20090322234A1

公开(公告)日：2009-12-31

申请号：US12164909

申请日：2008-06-30

申请人： Yuhui Chen ,  Junjie Zheng ,  John William Kesterson

发明人： Yuhui Chen ,  Junjie Zheng ,  John William Kesterson

IPC分类号： H05B37/02

CPC分类号： H05B33/0815 ,  H05B33/0818 ,  H05B33/0827 ,  H05B33/086

摘要： An LED driver includes at least two interlocked closed feedback loops. One feedback loop controls the duty cycle of the on/off times of a switch connected in series to the LED string, and the other feedback loop controls the duty cycle of the on/off times of a power switch in the switching power converter that provides a DC voltage applied to the LED string. The LED driver of the present invention achieves fast control of the LED brightness and current sharing among multiple LED strings simultaneously in a power-efficient and cost-efficient manner.

摘要翻译： LED驱动器包括至少两个互锁的闭合反馈回路。 一个反馈环路控制与LED串串联的开关的开/关时间的占空比，另一个反馈环控制提供的开关电源转换器中的电源开关的开/关时间的占空比 施加到LED串的DC电压。 本发明的LED驱动器以功率高效且成本有效的方式实现对LED亮度和多个LED串之间的电流共享的快速控制。