Circuits and methods for driving light sources
    21.
    发明授权
    Circuits and methods for driving light sources 失效
    用于驱动光源的电路和方法

    公开(公告)号:US08698419B2

    公开(公告)日:2014-04-15

    申请号:US13371351

    申请日:2012-02-10

    摘要: A circuit for driving a light-emitting diode (LED) light source includes a converter, a saw-tooth signal generator, and a controller. The converter includes a switch which is controlled by a driving signal. The converter provides a sense signal indicating the current through said LED light source. The saw-tooth signal generator generates a saw-tooth signal based on the driving signal. The controller generates the driving signal based on signals including the saw-tooth signal and the first sense signal to adjust the current through the LED light source to a target level and to correct a power factor of the driving circuit by controlling an average current of the input current to be substantially in phase with said input voltage.

    摘要翻译: 用于驱动发光二极管(LED)光源的电路包括转换器,锯齿信号发生器和控制器。 转换器包括由驱动信号控制的开关。 转换器提供指示通过所述LED光源的电流的感测信号。 锯齿信号发生器基于驱动信号产生锯齿信号。 控制器基于包括锯齿信号和第一感测信号的信号产生驱动信号,以将通过LED光源的电流调节到目标电平并通过控制驱动电路的平均电流来校正驱动电路的功率因数 输入电流与所述输入电压基本相同。

    Circuits and methods for alternating current-to-direct current conversion
    22.
    发明授权
    Circuits and methods for alternating current-to-direct current conversion 失效
    用于交流电流 - 直流电流转换的电路和方法

    公开(公告)号:US08441821B2

    公开(公告)日:2013-05-14

    申请号:US12966485

    申请日:2010-12-13

    IPC分类号: H02M7/04

    CPC分类号: H02M3/33507

    摘要: An AC-to-DC converter for converting an AC voltage to a DC voltage includes a first converter, a second converter, a sense circuit, a controller, and an enabling circuit. The first converter converts an AC voltage to a first DC voltage. The second converter converts the first DC voltage to a second DC voltage. The sense circuit coupled to the first and second converters provides a first sense signal indicative of the first DC voltage and a second sense signal indicative of the AC voltage. The controller coupled to the first and second converters controls the first and second DC voltages. The enabling circuit coupled to the sense circuit generates a control signal to the controller to disable both the first converter and the second converter by comparing the first sense signal to a first threshold voltage and comparing the second sense signal to a second threshold voltage.

    摘要翻译: 用于将AC电压转换为DC电压的AC-DC转换器包括第一转换器,第二转换器,感测电路,控制器和使能电路。 第一转换器将交流电压转换成第一直流电压。 第二转换器将第一直流电压转换成第二直流电压。 耦合到第一和第二转换器的感测电路提供指示第一DC电压的第一感测信号和指示AC电压的第二感测信号。 耦合到第一和第二转换器的控制器控制第一和第二DC电压。 耦合到感测电路的使能电路通过将第一感测信号与第一阈值电压进行比较并将第二感测信号与第二阈值电压进行比较来产生控制器的控制信号以禁用第一转换器和第二转换器。

    DIGITAL SIGNATURE COLLECTION AND AUTHENTICATION
    23.
    发明申请
    DIGITAL SIGNATURE COLLECTION AND AUTHENTICATION 有权
    数字签名收集和认证

    公开(公告)号:US20110090182A1

    公开(公告)日:2011-04-21

    申请号:US12978031

    申请日:2010-12-23

    申请人: Jianping Xu

    发明人: Jianping Xu

    IPC分类号: G06F3/033

    摘要: A digital signature collection and authentication system includes an ink pen having an ultrasonic transmitter that transmits ultrasonic energy to a plurality of ultrasonic receivers. A computer triangulates the location of the pen versus time to generate the signature shape, and to generate velocity and acceleration data. The pen also includes a pressure sensitive tip to record pressure applied to the pen tip. The pen also includes a higher frequency burst transmitter useful to generate a time reference, and to transmit the pressure information. The computer packetizes the shape, velocity, acceleration, and pressure data with a time stamp and an IP address or phone number, encrypts the packet and sends it to a host computer for authentication.

    摘要翻译: 数字签名收集和认证系统包括具有向超声波接收器发送超声波能量的超声波发射器的墨水笔。 计算机将笔的位置与时间进行三角测量以生成签名形状,并生成速度和加速度数据。 该笔还包括压力敏感的尖端以记录施加到笔尖的压力。 该笔还包括用于产生时间基准的较高频率脉冲串发射器,以及传送压力信息。 计算机使用时间戳和IP地址或电话号码对形状,速度,加速度和压力数据进行打包,对数据包进行加密,并将其发送到主机进行认证。

    Digital signature collection and authentication
    26.
    发明授权
    Digital signature collection and authentication 有权
    数字签名收集和认证

    公开(公告)号:US07279646B2

    公开(公告)日:2007-10-09

    申请号:US09865952

    申请日:2001-05-25

    申请人: Jianping Xu

    发明人: Jianping Xu

    IPC分类号: G09G5/00 G06K11/06

    摘要: A digital signature collection and authentication system includes an ink pen having an ultrasonic transmitter that transmits ultrasonic energy to a plurality of ultrasonic receivers. A computer triangulates the location of the pen versus time to generate the signature shape, and to generate velocity and acceleration data. The pen also includes a pressure sensitive tip to record pressure applied to the pen tip. The pen also includes a higher frequency burst transmitter useful to generate a time reference, and to transmit the pressure information. The computer packetizes the shape, velocity, acceleration, and pressure data with a time stamp and an IP address or phone number, encrypts the packet and sends it to a host computer for authentication.

    摘要翻译: 数字签名收集和认证系统包括具有向超声波接收器发送超声波能量的超声波发射器的墨水笔。 计算机将笔的位置与时间进行三角测量以生成签名形状,并生成速度和加速度数据。 该笔还包括压力敏感的尖端以记录施加到笔尖的压力。 该笔还包括用于产生时间基准的较高频率脉冲串发射器,以及传送压力信息。 计算机使用时间戳和IP地址或电话号码对形状,速度,加速度和压力数据进行打包,对数据包进行加密,并将其发送到主机进行认证。

    Resonance suppression circuit
    27.
    发明申请
    Resonance suppression circuit 有权
    谐振抑制电路

    公开(公告)号:US20050218972A1

    公开(公告)日:2005-10-06

    申请号:US10813169

    申请日:2004-03-31

    IPC分类号: B23K9/00

    摘要: A resonance suppression circuit is provided to suppress resonance on a power grid of a chip or die. The resonance suppression circuit may include a band-pass filter portion, a comparator portion, an amplification portion and a current dissipation portion. The band-pass filter portion may include an inverter coupled between two signal lines of the power grid. The comparator portion may sense voltage fluctuations at approximately the resonance frequency and trigger the current dissipation portion to turn ON and thereby change the frequency spectrum of the load current on the power grid to suppress the power grid resonance.

    摘要翻译: 提供谐振抑制电路以抑制芯片或管芯的电网上的共振。 谐振抑制电路可以包括带通滤波器部分,比较器部分,放大部分和电流消耗部分。 带通滤波器部分可以包括耦合在电网的两个信号线之间的反相器。 比较器部分可以感测大致谐振频率处的电压波动,并且触发电流耗散部分导通,从而改变电网上的负载电流的频谱以抑制电网谐振。

    Signaling medium and apparatus
    28.
    发明授权
    Signaling medium and apparatus 失效
    信号介质和仪器

    公开(公告)号:US06771862B2

    公开(公告)日:2004-08-03

    申请号:US09995434

    申请日:2001-11-27

    IPC分类号: G02B644

    摘要: A signaling medium is disclosed. The signaling medium includes several optical media and electrical conductors arranged such that one or more of the electrical conductors are disposed between the optical media. The medium may be shielded, and may included multiple groupings of electrical conductors and optical media. A connector; a signaling assembly, including a signaling medium and connector; a circuit board; and a signal communication system (including multiple circuit boards and one or more signaling media) are also disclosed.

    摘要翻译: 公开了一种信令介质。 信令介质包括若干光学介质和布置成使得一个或多个电导体设置在光学介质之间的电导体。 介质可以被屏蔽,并且可以包括多个电导体和光学介质的分组。 连接器 信令组件,包括信令介质和连接器; 电路板; 并且还公开了信号通信系统(包括多个电路板和一个或多个信令介质)。

    Ultrasonic wireless pen position determination system and method
    29.
    发明授权
    Ultrasonic wireless pen position determination system and method 失效
    超声波无线笔位置确定系统及方法

    公开(公告)号:US06535206B1

    公开(公告)日:2003-03-18

    申请号:US09507078

    申请日:2000-02-18

    申请人: Jianping Xu

    发明人: Jianping Xu

    IPC分类号: G09G500

    摘要: The invention in one embodiment provides a system and method for determining the position of an ultrasonic pen device, and for providing calculated position information to a computer system. The system of one embodiment comprises a first and second ultrasonic sensor that detect an ultrasonic signal emitted by an ultrasonic pen. The system further includes analog-to-digital converters to digitize the sensed ultrasonic signal and a processor to process the ultrasonic signal and determine the position of the ultrasonic pen. Some embodiments of the invention incorporate an algorithm that comprises calculating a first ultrasonic signal arrival time and calculating a second ultrasonic signal arrival time, and that further comprises using the first and second arrival times in calculating a final ultrasonic signal arrival time.

    摘要翻译: 本发明在一个实施例中提供了一种用于确定超声波笔装置的位置并用于向计算机系统提供计算的位置信息的系统和方法。 一个实施例的系统包括第一和第二超声波传感器,其检测由超声波笔发射的超声波信号。 该系统还包括用于数字化感测的超声波信号的模数转换器和处理器以处理超声波信号并确定超声波笔的位置。本发明的一些实施例结合了一种算法,其包括计算第一超声信号到达时间 以及计算第二超声波信号到达时间,并且还包括在计算最终超声信号到达时间时使用第一和第二到达时间。