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：US06509696B2

公开(公告)日：2003-01-21

申请号：US09815089

申请日：2001-03-22

Applicant: Gert Bruning ,  Chin Chang

Inventor： Gert Bruning ,  Chin Chang

IPC: H05B4116

CPC classification number: H05B41/282 ,  H01J61/56 ,  H01J61/70 ,  H01J61/78 ,  H01J65/046 ,  Y02B20/183 ,  Y10S315/05

Abstract: A capacitively coupled fluorescent lamp package having a capacitively coupled fluorescent lamp; an inverter circuit for driving the lamp; and supply nodes for receiving a supply voltage is disclosed. The capacitively coupled fluorescent lamp package includes a resonant circuit lamp driving scheme for driving the capacitively coupled fluorescent lamp. The driving scheme reduces parasitic capacitance leakage current; compensates the reactive power using the secondary side leakage inductance in order to have the resonant frequency approximately equal the inverter circuit operating frequency for current source-type driven circuits; and forms a series resonant sub-circuit with the embedded ballasting capacitor and the secondary side leakage inductance for voltage source-type driven circuits, such that the resonant frequency is substantially less than the inverter circuit operating frequency and that the lamp current is properly shaped along with current ballasting.

公开(公告)号：US06373725B1

公开(公告)日：2002-04-16

申请号：US09716698

申请日：2000-11-20

Applicant: Chin Chang ,  Adan Hernandez ,  Gert Bruning

Inventor： Chin Chang ,  Adan Hernandez ,  Gert Bruning

IPC: H02M3335

CPC classification number: H02M1/4208 ,  H02M1/10 ,  H02M2003/1557 ,  Y02B70/126

Abstract: A switchable power converter includes an input section that receives an AC input voltage and rectifies the AC input voltage and a switchable converter section operative to receive the rectified AC input voltage and convert the rectified AC input voltage to an intermediate DC output voltage. The switchable converter section includes at least one configuration switch operative to switch the switchable converter section between a boost converter topology, for low input line voltages, and either a flyback or SEPIC converter circuit topology, for high input line voltages.

Abstract translation: 可切换电力转换器包括接收AC输入电压并整流AC输入电压的输入部分和可操作以接收经整流的AC输入电压并将整流的AC输入电压转换为中间DC输出电压的可切换转换器部分。 可切换转换器部分包括至少一个配置开关，用于对于高输入线路电压，在用于低输入线路电压的升压转换器拓扑以及反激式或SEPIC转换器电路拓扑之间切换可切换转换器部分。

公开(公告)号：US06441558B1

公开(公告)日：2002-08-27

申请号：US09732197

申请日：2000-12-07

Applicant: Subramanian Muthu ,  Chin Chang ,  Gert Bruning

Inventor： Subramanian Muthu ,  Chin Chang ,  Gert Bruning

IPC: H05B3702

CPC classification number: H05B33/0863 ,  H05B33/0869 ,  H05B33/0872

Abstract: An LED luminary system for providing power to LED light sources to generate a desired light color comprises a power supply stage configured to provide a DC current signal. A light mixing circuit is coupled to said power supply stage and includes a plurality of LED light sources with red, green and blue colors to produce various desired lights with desired color temperatures. A controller system is coupled to the power supply stage and is configured to provide control signals to the power supply stage so as to maintain the DC current signal at a desired level for maintaining the desired light output. The controller system is further configured to estimate lumen output fractions associated with the LED light sources based on junction temperature of the LED light sources and chromaticity coordinates of the desired light to be generated at the light mixing circuit. The light mixing circuit further comprises a temperature sensor for measuring the temperature associated with the LED light sources and a light detector for measuring lumen output level of light generated by the LED light sources. Based on the temperatures measured, the controller system determines the amount of output lumen that each of the LED light sources need to generate in order to achieve the desired mixed light output, and the light detector in conjunction with a feedback loop maintains the required lumen output for each of the LED light sources.

Abstract translation: 用于向LED光源提供功率以产生期望的光色的LED照明系统包括被配置为提供DC电流信号的电源级。 光混合电路耦合到所述电源级，并且包括具有红色，绿色和蓝色颜色的多个LED光源，以产生具有期望色温的各种期望的光。 控制器系统耦合到电源级，并且被配置为向电源级提供控制信号，以便将DC电流信号保持在期望的电平以维持期望的光输出。 控制器系统还被配置为基于LED光源的结温度和在光混合电路处产生的期望光的色度坐标来估计与LED光源相关联的流明输出分数。 光混合电路还包括用于测量与LED光源相关的温度的温度传感器和用于测量由LED光源产生的光的流明输出水平的光检测器。 基于测量的温度，控制器系统确定每个LED光源需要产生的输出腔的量以实现期望的混合光输出，并且光检测器结合反馈回路保持所需的流明输出 对于每个LED光源。

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：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。