公开(公告)号：US07974107B2

公开(公告)日：2011-07-05

申请号：US12199471

申请日：2008-08-27

申请人： Yong Li ,  Junjie Zheng ,  Liang Yan ,  John Kesterson ,  Xiao Yan Wang

发明人： Yong Li ,  Junjie Zheng ,  Liang Yan ,  John Kesterson ,  Xiao Yan Wang

IPC分类号： H02M3/335

CPC分类号： H02M3/33523

摘要： A hybrid constant current control system that uses both pulse width modulation (PWM) and pulse frequency modulation (PFM) control. When transitioning from constant voltage mode to constant current mode the present invention can continue to control using PWM. Thereafter, when the voltage has dropped, the present invention smoothly transitions to PFM mode. The point of transition is based upon the switching frequency and the lowest rated voltage of operation. The system and method avoids very short (narrow) Ton times which ensures accurate constant current (CC) control with bipolar junction transistor (BJT) devices. The present invention also avoids acoustic noise because the switching frequency is maintained at a high enough level to avoid such acoustic noise even when the energy transferred through the transformer is still substantial and the output voltage is not too low. In addition the output current limit is insensitive to variation in the inductance-input voltage ratio, and is minimized against leakage inductance.

摘要翻译： 一种采用脉宽调制（PWM）和脉冲频率调制（PFM）控制的混合恒流控制系统。 当从恒定电压模式转换到恒定电流模式时，本发明可以使用PWM继续控制。 此后，当电压下降时，本发明平滑地转变为PFM模式。 转换点基于开关频率和最低额定工作电压。 该系统和方法避免了非常短（窄）的Ton次，从而确保使用双极结型晶体管（BJT）器件进行精确的恒定电流（CC）控制。 本发明还避免了声学噪声，因为即使当通过变压器传送的能量仍然很大并且输出电压不是太低时，开关频率被保持在足够高的水平以避免这种声学噪声。 此外，输出电流限制对电感 - 输入电压比的变化不敏感，并且对漏电感最小化。

公开(公告)号：US07443700B2

公开(公告)日：2008-10-28

申请号：US11745299

申请日：2007-05-07

申请人： Liang Yan ,  Junjie Zheng ,  John Kesterson ,  Xiaoyan Wang ,  Hien Bui

发明人： Liang Yan ,  Junjie Zheng ,  John Kesterson ,  Xiaoyan Wang ,  Hien Bui

IPC分类号： H02M3/335

CPC分类号： H02M3/33515 ,  H02M2001/0006

摘要： A primary side sensing power control system and method for constant current control that utilizes a relationship that involves the measured reset-time from the previous cycle to determine the primary side peak current and off-time for the next cycle. This control mechanism does not need the knowledge of input voltage or magnetizing inductance. Therefore, it removes the sensitivities of input voltage and magnetizing inductance to the output current limit. Furthermore, it uses a time measurement instead of a voltage measurement for the current calculation which in many cases is easier to perform.

摘要翻译： 用于恒定电流控制的初级侧感测功率控制系统和方法，其利用涉及来自前一周期的测量复位时间的关系来确定下一个周期的初级侧峰值电流和关断时间。 该控制机构不需要输入电压或励磁电感的知识。 因此，它可以消除输入电压和励磁电感对输出电流极限的敏感度。 此外，它使用时间测量而不是当前计算的电压测量，这在许多情况下更容易执行。

公开(公告)号：US20080067994A1

公开(公告)日：2008-03-20

申请号：US11856582

申请日：2007-09-17

申请人： John Kesterson ,  Junjie Zheng

发明人： John Kesterson ,  Junjie Zheng

IPC分类号： G05F1/44 ,  G05F1/02

CPC分类号： H02M3/33507

摘要： A modification of a control loop of a primary side sensing power control system that uses a different and unique relationship to accomplish the constant current control while attenuating the affects of a ripple voltage.

摘要翻译： 初级侧感测功率控制系统的控制回路的修改，其使用不同且独特的关系来实现恒定电流控制，同时衰减纹波电压的影响。

公开(公告)号：US20080112193A1

公开(公告)日：2008-05-15

申请号：US11745299

申请日：2007-05-07

申请人： Liang Yan ,  Junjie Zheng ,  John Kesterson ,  Xiaoyan Wang ,  Hien Bui

发明人： Liang Yan ,  Junjie Zheng ,  John Kesterson ,  Xiaoyan Wang ,  Hien Bui

IPC分类号： H02M3/335

CPC分类号： H02M3/33515 ,  H02M2001/0006

摘要： A primary side sensing power control system and method for constant current control that utilizes a relationship that involves the measured reset-time from the previous cycle to determine the primary side peak current and off-time for the next cycle. This control mechanism does not need the knowledge of input voltage or magnetizing inductance. Therefore, it removes the sensitivities of input voltage and magnetizing inductance to the output current limit. Furthermore, it uses a time measurement instead of a voltage measurement for the current calculation which in many cases is easier to perform.

摘要翻译： 用于恒定电流控制的初级侧感测功率控制系统和方法，其利用涉及来自前一周期的测量复位时间的关系来确定下一个周期的初级侧峰值电流和关断时间。 该控制机构不需要输入电压或励磁电感的知识。 因此，它可以消除输入电压和励磁电感对输出电流极限的敏感度。 此外，它使用时间测量而不是当前计算的电压测量，这在许多情况下更容易执行。

公开(公告)号：US20090059632A1

公开(公告)日：2009-03-05

申请号：US12199471

申请日：2008-08-27

申请人： Yong Li ,  Junjie Zheng ,  Liang Yan ,  John Kesterson ,  Xiao Yan Wang

发明人： Yong Li ,  Junjie Zheng ,  Liang Yan ,  John Kesterson ,  Xiao Yan Wang

IPC分类号： H02M7/155

CPC分类号： H02M3/33523

摘要： A hybrid constant current control system that uses both pulse width modulation (PWM) and pulse frequency modulation (PFM) control. When transitioning from constant voltage mode to constant current mode the present invention can continue to control using PWM. Thereafter, when the voltage has dropped, the present invention smoothly transitions to PFM mode. The point of transition is based upon the switching frequency and the lowest rated voltage of operation. The system and method avoids very short (narrow) Ton times which ensures accurate constant current (CC) control with bipolar junction transistor (BJT) devices. The present invention also avoids acoustic noise because the switching frequency is maintained at a high enough level to avoid such acoustic noise even when the energy transferred through the transformer is still substantial and the output voltage is not too low. In addition the output current limit is insensitive to variation in the inductance-input voltage ratio, and is minimized against leakage inductance.

摘要翻译： 一种采用脉宽调制（PWM）和脉冲频率调制（PFM）控制的混合恒流控制系统。 当从恒定电压模式转换到恒定电流模式时，本发明可以使用PWM继续控制。 此后，当电压下降时，本发明平滑地转变为PFM模式。 转换点基于开关频率和最低额定工作电压。 该系统和方法避免了非常短（窄）的Ton次，从而确保使用双极结型晶体管（BJT）器件进行精确的恒定电流（CC）控制。 本发明还避免了声学噪声，因为即使当通过变压器传送的能量仍然很大并且输出电压不是太低时，开关频率被保持在足够高的水平以避免这种声学噪声。 此外，输出电流限制对电感 - 输入电压比的变化不敏感，并且对漏电感最小化。

公开(公告)号：US20120274227A1

公开(公告)日：2012-11-01

申请号：US13495918

申请日：2012-06-13

申请人： Junjie Zheng ,  John W. Kesterson ,  Richard M. Myers ,  Baorong Chen ,  Gordon Chen

发明人： Junjie Zheng ,  John W. Kesterson ,  Richard M. Myers ,  Baorong Chen ,  Gordon Chen

IPC分类号： H05B37/02

CPC分类号： H05B33/0845 ,  H05B33/0815 ,  Y02B20/347

摘要： An LED lamp is provided in which the output light intensity of the LEDs in the LED lamp is adjusted based on the input voltage to the LED lamp. A dimmer control unit detects a type of dimmer switch during a configuration process. Using the detected dimmer type, the dimmer control unit generates control signals appropriate for the detected dimmer type to provide regulated current to the LEDs and to achieve the desired dimming effect. The LED lamp can be a direct replacement of conventional incandescent lamps in typical wiring configurations found in residential and commercial building lighting applications that use conventional dimmer switches.

摘要翻译： 提供了一种LED灯，其中LED灯的LED的输出光强度基于对LED灯的输入电压进行调节。 调光器控制单元在配置过程中检测调光器开关的类型。 使用检测到的调光器类型，调光器控制单元产生适合于检测到的调光器类型的控制信号，以向LED提供调节电流并实现期望的调光效果。 LED灯可以直接替代传统的白炽灯，它们在使用常规调光开关的住宅和商业建筑照明应用中发现的典型接线配置中。

公开(公告)号：US08199537B2

公开(公告)日：2012-06-12

申请号：US12388709

申请日：2009-02-19

申请人： Liang Yan ,  Xiaoyan Wang ,  Jun Zheng ,  Junjie Zheng ,  Clarita Poon

发明人： Liang Yan ,  Xiaoyan Wang ,  Jun Zheng ,  Junjie Zheng ,  Clarita Poon

IPC分类号： H02M3/335

CPC分类号： H02M3/33523 ,  H02M2001/0032 ,  Y02B70/16

摘要： A switching power converter detects low load conditions based on the ratio of a first peak current value for peak current switching in constant voltage regulation mode to a second peak current value for peak current switching in constant current regulation mode. The power supply load is considered to have a low load if the ratio is lower than a predetermined threshold. Once a low load condition is detected, the switching frequency of the switching power converter is reduced to a level that minimizes switching loss in the power converter. In addition, the switching power converter also adjusts the switching frequency according to the sensed input line voltage. An offset is added to the switching period to reduce the switching frequency of the switching power converter, as the input line voltage is increased.

摘要翻译： 开关电源转换器基于用于恒定电流调节模式下的峰值电流切换的恒定电压调节模式中的峰值电流切换的第一峰值电流值与用于恒定电流调节模式下的峰值电流切换的第二峰值电流值的比率来检测低负 如果该比率低于预定阈值，则电源负载被认为具有低负载。 一旦检测到低负载状态，则将开关功率转换器的开关频率降低到最小化功率转换器中的开关损耗的水平。 此外，开关功率转换器还根据感测的输入线电压来调节开关频率。 随着输入线电压的增加，偏置被加到开关周期以降低开关功率转换器的开关频率。

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：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。