公开(公告)号：US09083246B2

公开(公告)日：2015-07-14

申请号：US13090680

申请日：2011-04-20

申请人： Qiang Zong ,  Huizhen Zhu ,  Pingan Zhao ,  Yajiang Zhu

发明人： Qiang Zong ,  Huizhen Zhu ,  Pingan Zhao ,  Yajiang Zhu

IPC分类号： H02M3/335

CPC分类号： H02M3/33507

摘要： A switched mode power supply (SMPS) includes a transformer with a primary winding, a secondary winding, an auxiliary winding, and a power switch coupled to the primary winding. During one switching cycle, the auxiliary winding provides a feedback signal which includes a first voltage pulse that is induced after the power switch is turned on and a second voltage pulse that is induced after the power switch is turned off. A control circuit includes a circuit for generating a sampling signal for sampling the second voltage pulse in a switching cycle at a time that is determined based on the first voltage pulse in the same switching cycle. A sample-and-hold circuit is configured for sampling and storing the second voltage pulse in response to the sampling signal. A switching signal generating circuit is configured to generate a switching signal for controlling the power switch based on an output of the sample-and-hold circuit.

摘要翻译： 开关模式电源（SMPS）包括具有初级绕组的变压器，次级绕组，辅助绕组和耦合到初级绕组的功率开关。 在一个开关周期期间，辅助绕组提供反馈信号，该反馈信号包括在电源开关导通之后感应的第一电压脉冲和在电源开关断开之后引起的第二电压脉冲。 控制电路包括用于产生采样信号的电路，所述采样信号用于在基于相同切换周期中的第一电压脉冲确定的时间的开关周期中对第二电压脉冲进行采样。 采样保持电路被配置为响应于采样信号对第二电压脉冲进行采样和存储。 开关信号发生电路被配置为基于采样保持电路的输出产生用于控制功率开关的开关信号。

公开(公告)号：US08891259B2

公开(公告)日：2014-11-18

申请号：US13198981

申请日：2011-08-05

申请人： PingAn Zhao ,  Huizhen Zhu ,  Hu Wang ,  Chao Gao

发明人： PingAn Zhao ,  Huizhen Zhu ,  Hu Wang ,  Chao Gao

IPC分类号： H02M3/335 ,  H02M1/00 ,  H02M1/44

CPC分类号： H02M3/33507 ,  H02M1/44 ,  H02M2001/0032 ,  Y02B70/16

摘要： A control circuit is configured for controlling a power switch to regulate an output of a power converter. The control circuit is configured to increase a switching frequency of the power switch when a first signal representing a magnitude of the power converter is below a first output level. In some embodiment, the first output level is selected such that when the first signal is below the first output level, the power converter may generate audible noise. In an embodiment, when the first signal is above the first output level, the control circuit is configured to turn off the power switch when a second signal representing a current in the power switch is above a first reference level. On the other hand, when the first signal is below the first output level, the control circuit is configured to turn off the power switch if the second signal reaches a lower reference level.

摘要翻译： 控制电路被配置为用于控制功率开关以调节功率转换器的输出。 控制电路被配置为当表示功率转换器的幅度的第一信号低于第一输出电平时，增加电源开关的开关频率。 在一些实施例中，选择第一输出电平，使得当第一信号低于第一输出电平时，功率转换器可产生可听见的噪声。 在一个实施例中，当第一信号高于第一输出电平时，控制电路被配置为当表示电源开关中的电流的第二信号高于第一参考电平时，关闭电源开关。 另一方面，当第一信号低于第一输出电平时，如果第二信号达到较低的参考电平，则控制电路被配置为关闭电源开关。

公开(公告)号：US08213203B2

公开(公告)日：2012-07-03

申请号：US12620420

申请日：2009-11-17

申请人： Ruixia Fei ,  Tao Sun ,  QingHua Su ,  Huizhen Zhu

发明人： Ruixia Fei ,  Tao Sun ,  QingHua Su ,  Huizhen Zhu

IPC分类号： H02M7/537

CPC分类号： H02M3/33523

摘要： A controller for providing a constant output current control signal in a switched mode power supply (SMPS) includes a conduction time compensation circuit that is configured to produce a compensated conduction time interval signal that includes compensation for a ringing waveform of a feedback signal. The compensated signal reflects more accurately the actual conductive time of a rectifying diode in a secondary winding of the switched mode power supply. In one embodiment, the compensated conduction time interval signal is used to generate a fixed ratio between the conduction time and the non-conduction time of the rectifying diode. In another embodiment, the controller also provides a constant voltage control signal.

摘要翻译： 用于在开关模式电源（SMPS）中提供恒定输出电流控制信号的控制器包括导通时间补偿电路，其被配置为产生补偿的导通时间间隔信号，该信号包括对反馈信号的振铃波形的补偿。 补偿信号更准确地反映了开关模式电源的次级绕组中整流二极管的实际导通时间。 在一个实施例中，补偿导通时间间隔信号用于产生整流二极管的导通时间和非导通时间之间的固定比率。 在另一实施例中，控制器还提供恒定电压控制信号。

公开(公告)号：US20120293146A1

公开(公告)日：2012-11-22

申请号：US13198981

申请日：2011-08-05

申请人： PingAn Zhao ,  Huizhen Zhu ,  Hu Wang ,  Chao Gao

发明人： PingAn Zhao ,  Huizhen Zhu ,  Hu Wang ,  Chao Gao

IPC分类号： G05F1/10

CPC分类号： H02M3/33507 ,  H02M1/44 ,  H02M2001/0032 ,  Y02B70/16

摘要： A control circuit is configured for controlling a power switch to regulate an output of a power converter. The control circuit is configured to increase a switching frequency of the power switch when a first signal representing a magnitude of the power converter is below a first output level. In some embodiment, the first output level is selected such that when the first signal is below the first output level, the power converter may generate audible noise. In an embodiment, when the first signal is above the first output level, the control circuit is configured to turn off the power switch when a second signal representing a current in the power switch is above a first reference level. On the other hand, when the first signal is below the first output level, the control circuit is configured to turn off the power switch if the second signal reaches a lower reference level.

摘要翻译： 控制电路被配置为用于控制功率开关以调节功率转换器的输出。 控制电路被配置为当表示功率转换器的幅度的第一信号低于第一输出电平时，增加电源开关的开关频率。 在一些实施例中，选择第一输出电平，使得当第一信号低于第一输出电平时，功率转换器可产生可听见的噪声。 在一个实施例中，当第一信号高于第一输出电平时，控制电路被配置为当表示电源开关中的电流的第二信号高于第一参考电平时，关闭电源开关。 另一方面，当第一信号低于第一输出电平时，如果第二信号达到较低的参考电平，则控制电路被配置为关闭电源开关。

公开(公告)号：US08067727B2

公开(公告)日：2011-11-29

申请号：US11788844

申请日：2007-04-23

申请人： Michael Featherby ,  Carl S. Edwards ,  Huizhen Zhu

发明人： Michael Featherby ,  Carl S. Edwards ,  Huizhen Zhu

IPC分类号： H01J49/04

CPC分类号： G01N21/94 ,  H01J49/00

摘要： In a surface inspection system for detecting particles on a surface, a light source mounted to illuminate the surface provides multiple wavelength ranges of electromagnetic radiation. An optical detector produces an image of the surface. An optical signal is produced indicative of returned electromagnetic radiation at each of a plurality of the multiple wavelength ranges from a field of view on the surface. A processor operating on the optical signals resolves presence of a contaminant as a function of the optical signals, and produces a contaminant signal responsive to presence of a contaminant. A heating means positioned to evolve contaminants from the surface is responsively coupled to be activated in response to a contaminant signal. The multiple wavelength ranges comprise ultraviolet, visible, and infrared wavelengths. The processor comprises means to perform false color contrast stretching.

摘要翻译： 在用于检测表面上的颗粒的表面检查系统中，安装成照亮表面的光源提供电磁辐射的多个波长范围。 光学检测器产生表面的图像。 从表面的视野产生指示多个多个波长范围中的每一个处的返回的电磁辐射的光信号。 在光信号上操作的处理器根据光信号解决污染物的存在，并响应于污染物的存在产生污染物信号。 响应于污染物信号响应地耦合被定位成从表面放出污染物的加热装置被激活。 多个波长范围包括紫外线，可见光和红外波长。 该处理器包括执行假彩色对比度拉伸的装置。

公开(公告)号：US20110261596A1

公开(公告)日：2011-10-27

申请号：US13090680

申请日：2011-04-20

申请人： Qiang Zong ,  Huizhen Zhu ,  Pingan Zhao ,  Yajiang Zhu

发明人： Qiang Zong ,  Huizhen Zhu ,  Pingan Zhao ,  Yajiang Zhu

IPC分类号： H02M3/335

CPC分类号： H02M3/33507

摘要： A switched mode power supply (SMPS) includes a transformer with a primary winding, a secondary winding, an auxiliary winding, and a power switch coupled to the primary winding. During one switching cycle, the auxiliary winding provides a feedback signal which includes a first voltage pulse that is induced after the power switch is turned on and a second voltage pulse that is induced after the power switch is turned off. A control circuit includes a circuit for generating a sampling signal for sampling the second voltage pulse in a switching cycle at a time that is determined based on the first voltage pulse in the same switching cycle. A sample-and-hold circuit is configured for sampling and storing the second voltage pulse in response to the sampling signal. A switching signal generating circuit is configured to generate a switching signal for controlling the power switch based on an output of the sample-and-hold circuit.

摘要翻译： 开关模式电源（SMPS）包括具有初级绕组的变压器，次级绕组，辅助绕组和耦合到初级绕组的功率开关。 在一个开关周期期间，辅助绕组提供反馈信号，该反馈信号包括在电源开关导通之后感应的第一电压脉冲和在电源开关断开之后引起的第二电压脉冲。 控制电路包括用于产生采样信号的电路，所述采样信号用于在基于相同切换周期中的第一电压脉冲确定的时间的开关周期中对第二电压脉冲进行采样。 采样保持电路被配置为响应于采样信号对第二电压脉冲进行采样和存储。 开关信号发生电路被配置为基于采样保持电路的输出产生用于控制功率开关的开关信号。

公开(公告)号：US20100238689A1

公开(公告)日：2010-09-23

申请号：US12620420

申请日：2009-11-17

申请人： Ruixia Fei ,  Tao Sun ,  QingHua Su ,  Huizhen Zhu

发明人： Ruixia Fei ,  Tao Sun ,  QingHua Su ,  Huizhen Zhu

IPC分类号： H02M3/335

CPC分类号： H02M3/33523

摘要： A controller for providing a constant output current control signal in a switched mode power supply (SMPS) includes a conduction time compensation circuit that is configured to produce a compensated conduction time interval signal that includes compensation for a ringing waveform of a feedback signal. The compensated signal reflects more accurately the actual conductive time of a rectifying diode in a secondary winding of the switched mode power supply. In one embodiment, the compensated conduction time interval signal is used to generate a fixed ratio between the conduction time and the non-conduction time of the rectifying diode. In another embodiment, the controller also provides a constant voltage control signal.

摘要翻译： 用于在开关模式电源（SMPS）中提供恒定输出电流控制信号的控制器包括导通时间补偿电路，其被配置为产生补偿的导通时间间隔信号，该信号包括对反馈信号的振铃波形的补偿。 补偿信号更准确地反映了开关模式电源的次级绕组中整流二极管的实际导通时间。 在一个实施例中，补偿导通时间间隔信号用于产生整流二极管的导通时间和非导通时间之间的固定比率。 在另一实施例中，控制器还提供恒定电压控制信号。

公开(公告)号：US20070252084A1

公开(公告)日：2007-11-01

申请号：US11788844

申请日：2007-04-23

申请人： Michael Featherby ,  Carl Edwards ,  Huizhen Zhu

发明人： Michael Featherby ,  Carl Edwards ,  Huizhen Zhu

IPC分类号： G01T1/167

CPC分类号： G01N21/94 ,  H01J49/00

摘要： Foreign materials (contaminants) will usually affect many other properties of the surface as well as affecting the adhesion. This allows the use of indirect or off-contact measurement of surface energy to evaluate the quality of the surface. Our approach is environmentally friendly, uses no consumables and is totally benign to the surfaces being bonded. In order to detect contaminants on a substrate, the optical reflectivity properties of the materials can be compared. Metals and composites have different reflectivity than organics, which have low reflectivity (i.e. high absorption). This can usually be seen in white light by using a selected part of the light spectrum to enhance visual contrast between the two materials. This is because the reflectivity of a material changes with the wavelength of light. UV light can cause fluorescence of a few materials but this limits performance for a versatile machine. Extending the range from UV through the visible spectrum to IR gives a greater opportunity to find a frequency band where the reflectivity of the contaminant and the substrate are furthest apart for maximum contrast and sensitivity. By electronically enhancing these differences in the image through custom software, we can increase the sensitivity range even further. Thus UV/Vis./IR instruments can locate the contaminants but cannot identify them. A second technique such as a Mass Spectrometer can be used to identify and quantify the contaminant, the system uses a an ion mobility mass spectrometer (IMMS) to analyze and identify the contaminants evolved from a surface. The contaminants are released from the surface by local heating such as an IR laser or decomposed by a UV laser drawn into the IMMS and identified. These instruments can perform this identification separately or it may be combined in a hand-held spectroscope for this purpose. By using at least two types of illumination and filtering conditions and to add or subtract the images through software, we can pick out characteristic signatures for contaminants such as silicone.