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：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：US20080252882A1

公开(公告)日：2008-10-16

申请号：US12102358

申请日：2008-04-14

申请人： JOHN KESTERSON

发明人： JOHN KESTERSON

IPC分类号： G01J3/00 ,  G02B27/28

CPC分类号： G02B27/28 ,  G01J2003/1213 ,  G01J2003/1243 ,  G02B5/208 ,  H04N5/2254 ,  H04N5/238 ,  H04N5/33

摘要： A filter assembly adapted to be used with a camera for selectively controlling the light that reaches the camera's aperture. In one embodiment, the filter assembly comprises three filters adapted to be independently moved between a first position wherein they are not in front of the camera's aperture and a second position wherein they are in front of the camera's aperture. The first and second filters are polarizing filters adapted to block portions of visible light. The third filter is an infrared filter adapted to block infrared light. In addition to moving between its first position and its second position, the second filter is also adapted to rotate up to 360 degrees. The image captured by the camera may be improved using a computer implemented image enhancement system that uses one or more of multi-spectral imaging, deconvolution, edge enhancement, and dynamic range translation.

摘要翻译： 适于与照相机一起使用的滤光器组件，用于选择性地控制到达相机光圈的光。 在一个实施例中，过滤器组件包括三个过滤器，其适于独立地在第一位置和第二位置之间独立地移动，其中第一位置不在照相机孔的前方，而第二位置处于相机孔的前方。 第一和第二滤光器是适于阻挡可见光部分的偏振滤光片。 第三个滤光片是适用于阻挡红外光的红外滤光片。 除了在其第一位置和其第二位置之间移动之外，第二过滤器还适于旋转高达360度。 可以使用使用多光谱成像，去卷积，边缘增强和动态范围转换中的一个或多个的计算机实现的图像增强系统来改进由相机拍摄的图像。

公开(公告)号：US07003143B1

公开(公告)日：2006-02-21

申请号：US09704508

申请日：2000-11-02

申请人： Charles W. Hewitt ,  Edward J. Doolin ,  John Kesterson ,  Peter D. Lauren ,  Gary Greenberg

发明人： Charles W. Hewitt ,  Edward J. Doolin ,  John Kesterson ,  Peter D. Lauren ,  Gary Greenberg

IPC分类号： G06K9/00

CPC分类号： G06K9/00134

摘要： Tomographic methods and device for obtaining images of microscopic specimens such as Pap smears.

摘要翻译： 用于获得诸如巴氏涂片的微观标本的图像的层析方法和装置。

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：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。