公开(公告)号：US06376999B1

公开(公告)日：2002-04-23

申请号：US09663807

申请日：2000-09-15

Applicant: Yushan Li ,  Chin Chang

Inventor： Yushan Li ,  Chin Chang

IPC: H05B3702

CPC classification number: H05B41/2853 ,  H05B41/2828 ,  Y02B20/186 ,  Y10S315/05

Abstract: An LCD backlight inverter that comprises a power stage that includes a first power switch and a second power switch that powers one or more cold cathode fluorescent lamps. A controller generates control signals, receives an IC supply input signal having a voltage level equaling or exceeding a prescribed threshold level, and provides a steady-state internal oscillation that drives said first and second power switches. A transient prevention circuit maintains said second power switch in a nonconducting state until at least a time at which said IC supply input signal reaches said prescribed voltage threshold. Alternatively, a transient prevention circuit maintains said second power switch in a nonconducting state until at least a time at which said IC supply input signal reaches said prescribed voltage threshold, and additionally prevents the controller oscillator from generating said internally generated oscillation until at least a time at which a supply voltage to the IC reaches a threshold value.

Abstract translation: 一种LCD背光逆变器，包括功率级，功率级包括第一电源开关和为一个或多个冷阴极荧光灯供电的第二电源开关。 控制器产生控制信号，接收具有等于或超过规定阈值电平的电压电平的IC电源输入信号，并提供驱动所述第一和第二电源开关的稳态内部振荡。 瞬态防止电路将所述第二电源开关保持在非导通状态，直到所述IC电源输入信号达到所述规定电压阈值的至少一个时间。 或者，瞬态防止电路将所述第二电源开关保持在非导通状态，直到所述IC电源输入信号达到所述规定电压阈值的至少一个时间，并且另外防止控制器振荡器产生所述内部产生的振荡直到至少一个时间 其中IC的电源电压达到阈值。

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.

公开(公告)号：US06888529B2

公开(公告)日：2005-05-03

申请号：US09735151

申请日：2000-12-12

Applicant: Gert Bruning ,  Chin Chang

Inventor： Gert Bruning ,  Chin Chang

IPC: G02F1/13357 ,  G02F1/133 ,  G09G3/34 ,  H05B33/08 ,  G09G3/36

CPC classification number: G09G3/3413 ,  G09G2310/0235 ,  G09G2320/0261 ,  G09G2320/041 ,  G09G2320/062 ,  G09G2320/064 ,  G09G2320/0666 ,  H05B33/0818 ,  H05B33/0857 ,  H05B33/0869 ,  Y02B20/346

Abstract: A backlight for an LCD display comprised of an array of LEDs. The backlight may be driven and controlled by a fast pulse power converter, thus providing a response time for the backlight on the order of microseconds. The backlight may thus be used for image display, for example, in the depiction of images in a video input to the LCD and removal of image artifacts.

Abstract translation: 用于由LED阵列组成的LCD显示器的背光源。 背光源可以由快速脉冲功率转换器驱动和控制，从而为微秒级的背光提供响应时间。 因此，背光可以用于图像显示，例如，在对LCD的视频输入中的图像的描绘和图像伪像的去除。

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。

公开(公告)号：US06753661B2

公开(公告)日：2004-06-22

申请号：US10173346

申请日：2002-06-17

Applicant: Subramanian Muthu ,  Frank J. Schuurmans ,  Chin Chang ,  James Gaines

Inventor： Subramanian Muthu ,  Frank J. Schuurmans ,  Chin Chang ,  James Gaines

IPC: G05F100

CPC classification number: G09G3/3413 ,  G09G2320/043 ,  G09G2320/0606 ,  G09G2320/0626 ,  G09G2320/0633 ,  G09G2320/064 ,  G09G2320/0666 ,  G09G2360/145 ,  H05B33/0869 ,  H05B33/0872

Abstract: Apparatus and method for backlighting an electronic display with LEDs to control luminosity, radiometric power, and color levels by means of feedback control through a microprocessor, thereby maintaining white backlight at substantially constant levels, which can be chosen by an operator.

Abstract translation: 用于用LED背光的电子显示器的装置和方法，以通过微处理器的反馈控制来控制亮度，辐射功率和色彩水平，从而将白色背光保持在基本恒定的水平，这可以由操作者选择。

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。

公开(公告)号：US06510995B2

公开(公告)日：2003-01-28

申请号：US09810142

申请日：2001-03-16

Applicant: Subramanian Muthu ,  Chin Chang

Inventor： Subramanian Muthu ,  Chin Chang

IPC: G06K714

CPC classification number: H05B33/0815 ,  H05B33/0827 ,  H05B33/0866

Abstract: A device for controlling and adjusting a display light for a retail display system comprising a computer associated with plural light sources for adjusting the light sources to optimally display particular products. The light sources are adjusted based upon a prestored table specifying optimal lighting conditions for each of plural products, and a feedback loop that feeds back actual lighting conditions.

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。

公开(公告)号：US5781418A

公开(公告)日：1998-07-14

申请号：US773243

申请日：1996-12-23

Applicant: Chin Chang ,  Joseph En-Cheng Chang

Inventor： Chin Chang ,  Joseph En-Cheng Chang

IPC: H05B41/24 ,  H02M7/5383 ,  H02M7/53846 ,  H05B41/282 ,  H05B41/285 ,  H05B41/298 ,  H05B41/392 ,  H02M3/335 ,  G05F1/00

CPC classification number: H02M7/53803 ,  H05B41/2828 ,  H05B41/2856 ,  H05B41/2986 ,  H05B41/3925 ,  H02M2007/4815 ,  H02M2007/53878 ,  Y02B70/1441

Abstract: A power supply is disclosed which includes a resonant circuit, and a voltage-fed inverter producing an applied voltage at an output coupled to the resonant circuit, the inverter responsive to a driving signal. A driving circuit has an input representing the sensed current flowing through the resonant circuit and includes phase-shifting circuitry. The driving circuit produces the driving signal based on phase-shift of the sensed current by the phase-shifting circuitry.

Abstract translation: 公开了一种电源，其包括谐振电路，以及在耦合到谐振电路的输出端处产生施加电压的电压反相逆变器，所述逆变器响应于驱动信号。 驱动电路具有表示流过谐振电路的感测电流的输入，并且包括相移电路。 驱动电路基于相移电路对感测电流的相移产生驱动信号。

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。