中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

54 records (took 0.021 seconds)

    Transformation structures for approximating color matching functions
    1.
    发明申请
    Transformation structures for approximating color matching functions 失效

    公开(公告)号：US20060045331A1

    公开(公告)日：2006-03-02

    申请号：US10538202

    申请日：2003-12-04

    Applicant: Chin Chang

    Inventor： Chin Chang

    IPC: G06K9/00

    CPC classification number: H04N1/48 ,  G01J3/46 ,  G01J3/465 ,  G01J3/501 ,  G01J3/51 ,  G01J2003/467 ,  H04L65/80 ,  H04L69/10 ,  H04L69/28 ,  H04L69/40

    Abstract: RGB filter set and color estimation performance for RGB LED color sensing is provided. A criteria function describing an error between desired color matching functions and a spectral response of an RGB filter set is constructed. RGB filter set response characteristics based on the criteria function are then determined. Finally, color estimation parameters for substantially optimal color estimation with the RGB filter set are determined based upon the determined RGB filter set response characteristics. Computer readable code for constructing a criteria function is provided. Computer readable code for determining RGB filter set response characteristics is also provided. Finally, computer readable code for determining color estimation parameters is provided.

    Voltage-fed push LLC resonant LCD backlighting inverter circuit
    3.
    发明授权
    Voltage-fed push LLC resonant LCD backlighting inverter circuit 失效
    电压推进LLC谐振LCD背光逆变电路

    公开(公告)号：US06784867B1

    公开(公告)日：2004-08-31

    申请号：US09713411

    申请日：2000-11-16

    Applicant: Chin Chang

    Inventor： Chin Chang

    IPC: G09G336

    CPC classification number: H05B41/2824 ,  H05B41/3927

    Abstract: An improved electronic LCD backlighting inverter circuit for high frequency operation under low frequency pulse width modulation (PWM) for dimming control. The improved electronic LCD backlighting inverter is based on a voltage-fed push-pull LLC resonant inverter circuit configuration including a resonant inductor (L), magnetizing inductance of an output transformer (L), and resonant capacitor (C). For large values of magnetizing inductance the LLC circuit effectively becomes an LC resonant circuit. By synchronizing the high frequency switching signal and the low frequency modulation frequency using logic control circuitry, a wide dimming range and higher efficiency are achieved under PWM control.

    Abstract translation: 改进的电子LCD背光逆变电路，用于低频脉宽调制（PWM）下的高频工作，用于调光控制。 改进的电子LCD背光逆变器基于包括谐振电感器（L），输出变压器（L）的磁化电感和谐振电容器（C））的电压推挽LLC谐振逆变器电路配置。 对于大的励磁电感值，LLC电路有效地成为LC谐振电路。 通过使用逻辑控制电路同步高频开关信号和低频调制频率，在PWM控制下实现了宽的调光范围和更高的效率。

    Integrated LED driving device with current sharing for multiple LED strings
    5.
    发明授权
    Integrated LED driving device with current sharing for multiple LED strings 有权
    集成LED驱动装置，具有多个LED串的电流共享

    公开(公告)号：US06621235B2

    公开(公告)日：2003-09-16

    申请号：US09922211

    申请日：2001-08-03

    Applicant: Chin Chang

    Inventor： Chin Chang

    IPC: H05B3702

    CPC classification number: H05B33/0827 ,  Y10S362/80

    Abstract: An integrated LED driving device for multiple LED strings which employs a single linear regulator or other controller and a multiple-output current mirror which is almost independent of the DC input voltage source, almost independent of the transistor's or MOSFET's variations from the semiconductor integration process, and almost independent of temperature variation. The multiple-output current mirror includes a plurality of transistors or MOSFETs each of which are integrated on the same substrate, with identical width-to-length channel ratios and with identical source and gate connections. The integrated LED driving device provides for automatic current sharing in a DC mode and, alternately, with minimized phase delays in a PWM mode. The mirror-output current mirror may include mirror-cascode transistor pairs.

    Abstract translation: 用于多个LED串的集成LED驱动装置，其采用单个线性调节器或其他控制器和几乎独立于DC输入电压源的多输出电流镜，几乎独立于晶体管或MOSFET与半导体集成过程的差异， 几乎独立于温度变化。 多输出电流镜包括多个晶体管或MOSFET，每个晶体管或MOSFET集成在相同的衬底上，具有相同的宽度与长度的沟道比并具有相同的源极和栅极连接。 集成LED驱动装置提供DC模式下的自动电流共享，或者以PWM模式的最小相位延迟。 镜像输出电流镜可以包括镜面共源共栅晶体管对。

    White light-emitting-diode lamp driver based on multiple output converter with output current mode control
    7.
    发明授权
    White light-emitting-diode lamp driver based on multiple output converter with output current mode control 失效
    基于多输出转换器的白色发光二极管灯驱动器，具有输出电流模式控制

    公开(公告)号：US06369525B1

    公开(公告)日：2002-04-09

    申请号：US09717969

    申请日：2000-11-21

    Applicant: Chin Chang ,  Subramanian Muthu ,  Gert W. Bruning

    Inventor： Chin Chang ,  Subramanian Muthu ,  Gert W. Bruning

    IPC: G05F100

    CPC classification number: H05B33/0815 ,  H02M3/33561 ,  H02M3/33569 ,  H02M2001/342 ,  H05B33/0818 ,  H05B33/086 ,  Y02B70/1491 ,  Y10S362/80

    Abstract: A white light-emitting-diode array driver circuit with a multiple output flyback (or forward) converter with output current mode control. The circuit comprises a power supply source and a transformer. The transformer has a primary winding coupled to, and configured to receive current from, the power supply, and a plurality of secondary windings coupled to the primary winding. The circuit also comprises a plurality of light-emitting-diode arrays, wherein each light-emitting-diode array is coupled to one of the secondary windings. A main controller is coupled to a first of the light-emitting-diode arrays and is configured to control a flow of current to the primary transformer winding. The circuit also comprises a plurality of secondary controllers, each of which are coupled to another of the light-emitting-diode arrays. In addition, each of the secondary controllers are configured to control a flow of current to its corresponding light-emitting-diode array. According to one embodiment of the invention, each of the light-emitting diodes has a resistor coupled to its cathode terminal. An output signal of each resistor is transmitted to the respective controller and is employed to determine the appropriate current flow to the light-emitting-diode array. The circuit may be configured as either a flyback converter, wherein the primary transformer winding is wound in the opposite direction of the secondary transformer windings, or as a forward converter, wherein the primary transformer winding is wound in the same direction as secondary transformer windings.

    Abstract translation: 具有输出电流模式控制的多输出反激（或正向）转换器的白色发光二极管阵列驱动电路。 电路包括电源和变压器。 变压器具有耦合到并且被配置为从电源接收电流的初级绕组和耦合到初级绕组的多个次级绕组。 该电路还包括多个发光二极管阵列，其中每个发光二极管阵列耦合到一个次级绕组。 主控制器耦合到第一个发光二极管阵列，并被配置为控制到初级变压器绕组的电流。 电路还包括多个次级控制器，每个次级控制器耦合到另一个发光二极管阵列。 此外，每个次级控制器被配置为控制到其对应的发光二极管阵列的电流。 根据本发明的一个实施例，每个发光二极管具有耦合到其阴极端子的电阻器。 每个电阻器的输出信号被发送到相应的控制器，并用于确定到发光二极管阵列的适当电流。 电路可以被配置为反激式转换器，其中初级变压器绕组沿次级变压器绕组的相反方向缠绕，或者作为正向转换器，其中初级变压器绕组沿与第二变压器绕组相同的方向缠绕。

    Transformation structures for approximating color matching functions
    9.
    发明授权
    Transformation structures for approximating color matching functions 失效
    用于近似颜色匹配函数的变换结构

    公开(公告)号：US07593567B2

    公开(公告)日：2009-09-22

    申请号：US10538202

    申请日：2003-12-04

    Applicant: Chin Chang

    Inventor： Chin Chang

    IPC: G06K9/00 ,  H04N3/14 ,  H04N5/335 ,  H04N9/04

    CPC classification number: H04N1/48 ,  G01J3/46 ,  G01J3/465 ,  G01J3/501 ,  G01J3/51 ,  G01J2003/467 ,  H04L65/80 ,  H04L69/10 ,  H04L69/28 ,  H04L69/40

    Abstract: RGB filter set and color estimation performance for RGB LED color sensing is provided. A criteria function describing an error between desired color matching functions and a spectral response of an RGB filter set is constructed. RGB filter set response characteristics based on the criteria function are then determined. Finally, color estimation parameters for substantially optimal color estimation with the RGB filter set are determined based upon the determined RGB filter set response characteristics. Computer readable code for constructing a criteria function is provided. Computer readable code for determining RGB filter set response characteristics is also provided. Finally, computer readable code for determining color estimation parameters is provided.

    Abstract translation: 提供了RGB LED颜色感测的RGB滤镜组和色彩估计性能。 构建描述所需颜色匹配函数和RGB滤波器组的光谱响应之间的误差的标准函数。 然后确定基于标准函数的RGB滤波器组响应特性。 最后，基于所确定的RGB滤波器组响应特性来确定用于RGB滤波器组的基本上最佳颜色估计的颜色估计参数。 提供了用于构建标准函数的计算机可读代码。 还提供了用于确定RGB滤波器组响应特性的计算机可读代码。 最后，提供了用于确定颜色估计参数的计算机可读代码。

    Method and apparatus for improved current mode control for large conversion ratio synchronous buck converter with lossless current sense
    10.
    发明授权
    Method and apparatus for improved current mode control for large conversion ratio synchronous buck converter with lossless current sense 失效
    用于具有无损电流检测的大转换比同步降压转换器的改进电流模式控制的方法和装置

    公开(公告)号：US07508182B1

    公开(公告)日：2009-03-24

    申请号：US11553434

    申请日：2006-10-26

    Applicant: Chin Chang

    Inventor： Chin Chang

    IPC: G05F1/575 ,  G05F1/618

    CPC classification number: H02M3/1588 ,  H02M2001/0009 ,  Y02B70/1466

    Abstract: Methods and apparatuses are provided for monitoring an inductor output current delivered to a load by a power converter. For example, there is provided an apparatus comprising: at least one power switch operatively coupled to an input voltage source; an output inductor operatively coupled to the at least one power switch and to the load; and a current sensor operatively coupled to the output inductor, the current sensor providing a current sense signal corresponding to the inductor output current delivered to the load. In one embodiment, the current sensor comprises: a filter comprising a first resistor coupled in series with a first capacitor; and a second capacitor coupled in parallel with the first resistor, the first and second capacitors forming an AC voltage divider to increase the signal-to-noise ratio of the current sense signal.

    Abstract translation: 提供了用于监测由功率转换器传送到负载的电感器输出电流的方法和装置。 例如，提供了一种装置，包括：至少一个功率开关，其可操作地耦合到输入电压源; 输出电感器，可操作地耦合到所述至少一个电源开关和所述负载; 以及可操作地耦合到输出电感器的电流传感器，电流传感器提供对应于传递到负载的电感器输出电流的电流感测信号。 在一个实施例中，电流传感器包括：滤波器，包括与第一电容器串联耦合的第一电阻器; 以及与所述第一电阻器并联耦合的第二电容器，所述第一和第二电容器形成AC分压器以增加所述电流感测信号的信噪比。

Patent Agency Ranking