公开(公告)号：US08279144B2

公开(公告)日：2012-10-02

申请号：US12183492

申请日：2008-07-31

申请人： Bin Zhao ,  Jack W. Cornish ,  Brian B. Horng ,  Andrew M Kameya ,  Jan Krellner ,  Kenneth C. Kwok ,  Victor K. Lee ,  Weizhuang W. Xin

发明人： Bin Zhao ,  Jack W. Cornish ,  Brian B. Horng ,  Andrew M Kameya ,  Jan Krellner ,  Kenneth C. Kwok ,  Victor K. Lee ,  Weizhuang W. Xin

IPC分类号： G09G3/32

CPC分类号： H05B33/0815 ,  H05B33/0827 ,  H05B33/086

摘要： Disclosed are example techniques for frame-based power management in a light emitting diode (LED) system having a plurality of LED strings. A voltage source provides an output voltage to drive the LED strings. An LED driver generates a frame timing reference representative of the frame rate or display timing of a series of image frames to be displayed via the LED system. An update reference is generated from the frame timing reference. The LED driver monitors one or more operating parameters of the LED system. In response to update triggers marked by the update reference, the LED driver adjusts the output voltage of the voltage source based on the status of each of the one or more monitored operating parameters (either from the previous update period or determined in response to the update trigger), thereby synchronizing the updating of the output voltage to the frame rate (or a virtual approximation of the frame rate) of the video being displayed.

摘要翻译： 公开了具有多个LED串的发光二极管（LED）系统中用于基于帧的电源管理的示例技术。 电压源提供输出电压来驱动LED串。 LED驱动器生成表示要通过LED系统显示的一系列图像帧的帧速率或显示定时的帧定时参考。 从帧定时参考生成更新参考。 LED驱动器监视LED系统的一个或多个操作参数。 响应于由更新参考标记的更新触发器，LED驱动器基于一个或多个监视的操作参数中的每一个的状态来调节电压源的输出电压（从先前的更新周期或响应于更新确定） 触发），从而将输出电压的更新同步于正在显示的视频的帧速率（或帧速率的虚拟近似）。

公开(公告)号：US08115414B2

公开(公告)日：2012-02-14

申请号：US12363179

申请日：2009-01-30

申请人： Bin Zhao ,  Jack W. Cornish ,  Brian B. Horng ,  Victor K. Lee ,  Andrew M. Kameya

发明人： Bin Zhao ,  Jack W. Cornish ,  Brian B. Horng ,  Victor K. Lee ,  Andrew M. Kameya

IPC分类号： H05B37/02

CPC分类号： H05B33/0815 ,  H05B33/0827

摘要： Techniques for dynamic headroom control in a light emitting diode (LED) system are disclosed. An output voltage is provided to drive a plurality of LED strings. A feedback controller monitors the tail voltages of the LED strings to identify the minimum tail voltage and adjusts the output voltage based on the lowest tail voltage. The LED strings grouped into subsets and the feedback controller is segmented such that, for a certain duration, a minimum tail voltage is determined for each subset. The minimum tail voltages of the subsets are used to determine the overall minimum tail voltage of the plurality of LED strings for the certain duration so as to control the output voltage in the following duration. The segments of the feedback controller can be implemented in separate integrated circuit (IC) packages, thereby facilitating adaptation to different numbers of LED strings by integrating the corresponding number of IC packages.

摘要翻译： 公开了一种用于发光二极管（LED）系统中的动态裕量控制技术。 提供输出电压以驱动多个LED串。 反馈控制器监视LED串的尾部电压，以识别最小尾电压，并根据最低的尾部电压调节输出电压。 将LED串分组成子集，并且反馈控制器被分段，使得在一定持续时间内，为每个子集确定最小尾电压。 子集的最小尾电压用于在特定持续时间内确定多个LED串的总体最小尾电压，以便在随后的持续时间内控制输出电压。 反馈控制器的段可以在单独的集成电路（IC）封装中实现，从而通过集成相应数量的IC封装来促进适应不同数量的LED串。

公开(公告)号：US20090273288A1

公开(公告)日：2009-11-05

申请号：US12504335

申请日：2009-07-16

申请人： Bin Zhao ,  Jack W. Cornish ,  Brian B. Horng ,  Andrew M. Kameya ,  Kenneth C. Kwok ,  Victor K. Lee

发明人： Bin Zhao ,  Jack W. Cornish ,  Brian B. Horng ,  Andrew M. Kameya ,  Kenneth C. Kwok ,  Victor K. Lee

IPC分类号： H05B37/02

CPC分类号： H05B33/0827 ,  G09G3/342 ,  G09G2320/064 ,  H05B33/0815 ,  H05B33/0818

摘要： A light emitting diode (LED) system implements a LED driver to drive a set of one or more LED strings. The LED driver includes a voltage source to provide an adjustable output voltage to a head end of each LED string of the set for a first duration and a second duration following the first duration. The LED driver further includes a feedback controller to control the voltage source to adjust the output voltage for the second duration based on a digital code value generated from a minimum tail voltage of one or more tail voltages of the set at a sample point of the first duration. The LED driver further includes a power controller to temporarily enable one or more components of the feedback controller for a sample period of the first duration, the sample period comprising the sample point.

摘要翻译： 发光二极管（LED）系统实现LED驱动器以驱动一组或多个LED串。 LED驱动器包括电压源，以在第一持续时间和第一持续时间之后的第一持续时间和第二持续时间内向组的每个LED串的头端提供可调节的输出电压。 所述LED驱动器还包括反馈控制器，用于控制所述电压源，以基于在所述第一持续时间内的所述第一持续时间的采样点从所述组的一个或多个尾部电压的最小尾部电压产生的数字代码值来调整所述输出电压 持续时间 LED驱动器还包括功率控制器，用于临时使得反馈控制器的一个或多个部件在第一持续时间的采样周期内，该采样周期包括采样点。

公开(公告)号：US06163266A

公开(公告)日：2000-12-19

申请号：US207450

申请日：1998-12-08

申请人： Greg H. Fasullo ,  Jin He ,  Greg P. Jorgenson ,  Victor K. Lee

发明人： Greg H. Fasullo ,  Jin He ,  Greg P. Jorgenson ,  Victor K. Lee

IPC分类号： F04D27/02 ,  H02H3/04 ,  H02H7/093 ,  G08B21/00

CPC分类号： H02H7/093 ,  F04D27/008 ,  H02H3/04

摘要： For use with a DC fan, a detection circuit and a method of detecting an operational condition thereof. In one embodiment, the detection circuit includes: (1) a sensor, coupled to the DC fan, that senses a current through the sensorless DC fan and produces an intermediate signal based thereon and (2) an alarm circuit, coupled to the sensor, that compares the intermediate signal to a range defined by an upper limit signal and a lower limit signal and generates an alarm signal when the intermediate signal is outside of the range.

摘要翻译： 用于DC风扇，检测电路和检测其操作条件的方法。 在一个实施例中，检测电路包括：（1）耦合到DC风扇的传感器，其感测通过无传感器的DC风扇的电流并基于其产生中间信号;以及（2）耦合到传感器的报警电路， 其将中间信号与由上限信号和下限信号限定的范围进行比较，并且当中间信号在该范围之外时产生报警信号。

公开(公告)号：US5949671A

公开(公告)日：1999-09-07

申请号：US48246

申请日：1998-03-25

申请人： Victor K. Lee ,  Rui Liu

发明人： Victor K. Lee ,  Rui Liu

IPC分类号： H02M7/17 ,  G05F1/563 ,  H02M1/10 ,  H02M3/335 ,  H02M7/12

CPC分类号： H02M3/33561

摘要： For use with a DC power supply having first and second output rectifying circuits couplable in alternative configurations to provide dual voltages at an output of the DC power supply, an adaptive voltage controller and a method of adaptively controlling the output voltage. In one embodiment, the adaptive voltage controller includes: (1) a configuration determination circuit, coupled to the output, that generates a configuration signal that is a function of a configuration of the first and second output rectifying circuits, (2) a voltage feedback circuit, coupled to the configuration determination circuit, that develops a voltage feedback signal based on the configuration signal and (3) a voltage control circuit, coupled to the voltage feedback circuit, that receives the voltage feedback signal and controls an output voltage of the DC power supply as a function thereof.

摘要翻译： 用于具有可替换配置的第一和第二输出整流电路的DC电源，以在DC电源的输出端提供双电压，自适应电压控制器和自适应地控制输出电压的方法。 在一个实施例中，自适应电压控制器包括：（1）耦合到输出的配置确定电路，其产生作为第一和第二输出整流电路的配置的函数的配置信号，（2）电压反馈 电路，耦合到配置确定电路，其基于配置信号产生电压反馈信号;以及（3）耦合到电压反馈电路的电压控制电路，其接收电压反馈信号并控制DC的输出电压 电源作为其功能。

公开(公告)号：US11949224B2

公开(公告)日：2024-04-02

申请号：US17704089

申请日：2022-03-25

申请人： Timothy T. Hsia ,  Victor K. Lee

发明人： Timothy T. Hsia ,  Victor K. Lee

IPC分类号： H02H3/20 ,  H02H1/00

CPC分类号： H02H3/20 ,  H02H1/0007

摘要： One example includes a power supply system. The system includes a voltage-limit power regulator to generate an output voltage and an instantaneous overvoltage sensor configured to detect an overvoltage condition associated with the output voltage. The system further includes an overvoltage latch-off timer system configured to initiate a latch-off timer in response to detecting the overvoltage condition. The latch-off timer can be uninterrupted by an amplitude of the output voltage. The overvoltage latch-off timer system can further be configured to detect a persistent overvoltage fault in response to detecting the overvoltage condition after expiration of the latch-off timer. The overvoltage latch-off timer system can be configured to generate a fault signal to disable the voltage-limit power regulator in response to detecting the persistent overvoltage fault.

公开(公告)号：US11209849B1

公开(公告)日：2021-12-28

申请号：US16563023

申请日：2019-09-06

申请人： Timothy T. Hsia ,  Victor K. Lee

发明人： Timothy T. Hsia ,  Victor K. Lee

IPC分类号： G05F1/575 ,  G05F1/625

摘要： A circuit includes a regulation module having a threshold input to receive a clamp threshold voltage and a feedback input to monitor a swing-limited output voltage. The regulation module generates a difference signal that indicates a difference between the clamp threshold voltage and the swing-limited output voltage. A current compensation module includes a clamp port and an input port. The clamp port to controls the swing-limited output voltage and the input port receives the difference signal. The clamp port generates an adjustment current to control the swing-limited output voltage based on the difference signal. An adjustment network receives an input voltage and the adjustment current from the clamp port. The adjustment current to generate a voltage across the adjustment network such that the swing-limited output voltage at the clamp port is adjusted within a voltage range of the input voltage.

公开(公告)号：US08373643B2

公开(公告)日：2013-02-12

申请号：US12244796

申请日：2008-10-03

申请人： Bin Zhao ,  Andrew M. Kameya ,  Victor K. Lee

发明人： Bin Zhao ,  Andrew M. Kameya ,  Victor K. Lee

IPC分类号： G09G3/36

CPC分类号： G09G3/3406 ,  G09G2320/064

摘要： A PWM generation module generates a PWM data signal used to control a light emitting diode (LED) driver for one or more strings of LEDs of a display device. The PWM data signal is synchronized with the frame boundaries of the video content being displayed. The PWM generation module can configure the PWM data signal such that a new PWM cycle is initiated at the start of each successive frame, and further whereby those PWM cycles that would be prematurely terminated at frame boundaries are instead driven at a constant reference level until the frame boundary. With this configuration, a substantially linear average light intensity can be achieved across frames, thereby reducing or eliminating display distortion that is often present in other PWM cycle synchronization techniques. The PWM generation module can use a self-learning process to make adjustments to the expected number of completeable PWM cycles per frame in response to dynamic changes in the frame rate, PWM frequency, or other related display parameters.

摘要翻译： PWM生成模块生成用于控制显示装置的一个或多个LED串的发光二极管（LED）驱动器的PWM数据信号。 PWM数据信号与正在显示的视频内容的帧边界同步。 PWM生成模块可以配置PWM数据信号，使得在每个连续帧的开始处启动新的PWM周期，并且进一步地，将在帧边界处过早终止的那些PWM周期以恒定的参考电平驱动直到 帧边界。 利用这种配置，可以跨帧实现基本线性的平均光强度，从而减少或消除其他PWM周期同步技术中经常出现的显示失真。 PWM生成模块可以使用自学习过程来响应于帧速率，PWM频率或其他相关显示参数的动态变化来调整每帧的可完成PWM周期的预期数量。

公开(公告)号：US08188771B2

公开(公告)日：2012-05-29

申请号：US12537443

申请日：2009-08-07

申请人： Bin Zhao ,  Andrew M. Kameya ,  Victor K. Lee

发明人： Bin Zhao ,  Andrew M. Kameya ,  Victor K. Lee

IPC分类号： H03B19/00 ,  H03K7/08

摘要： A pulse width modulation (PWM) frequency converter converts an input PWM signal to an output PWM signal having a different frequency while maintaining a substantially equal duty ratio. The PWM frequency converter samples the input PWM signal for a PWM cycle using a sampling clock. A filter module filters the resulting set of one or more PWM parameters to compensate for noise introduced by potential clock mismatch, clock jitter, ambient variations, and other non-deterministic issues, thereby generating filtered PWM parameters. The sampling employed by the filter module compares a difference between the one or more current PWM parameters and previous (or historical) PWM parameters from an earlier sampled PWM cycle to a predetermined change threshold in determining a filtered set of one or more PWM parameters. The filtered set of one or more PWM parameters then is used to generate one or more corresponding PWM cycles of the output signal.

公开(公告)号：US08049439B2

公开(公告)日：2011-11-01

申请号：US12363607

申请日：2009-01-30

申请人： Bin Zhao ,  Jack W. Cornish ,  Brian B. Horng ,  Victor K. Lee ,  Andrew M. Kameya

发明人： Bin Zhao ,  Jack W. Cornish ,  Brian B. Horng ,  Victor K. Lee ,  Andrew M. Kameya

IPC分类号： H05B37/02

CPC分类号： H05B33/0815 ,  H05B33/0827 ,  Y02B20/347

摘要： A voltage source provides an output voltage to drive a plurality of light emitting diode (LED) strings. A LED driver adjusts the level of the output voltage so as to maintain the lowest tail voltage of the LED strings at or near a predetermined threshold voltage so as provide sufficient headroom voltages for current regulators for the LED strings. The LED driver operates in an operational mode and a calibration mode, which can be implemented in parallel with, or part of, the operational mode. During the calibration mode, the LED driver determines, for each LED string, a code value representative of the level of the output voltage necessary to maintain the tail voltage of the corresponding LED string at or near the predetermined threshold voltage. In the operational mode, the code values from the calibration mode are used to control the voltage source to provide an appropriate level for the output voltage.

摘要翻译： 电压源提供输出电压以驱动多个发光二极管（LED）串。 LED驱动器调节输出电压的电平，以便将LED串的最低尾电压保持在预定阈值电压处或接近预定阈值电压，以便为LED串的电流调节器提供足够的净空电压。 LED驱动器在操作模式和校准模式下操作，其可以与操作模式并行或部分实现。 在校准模式期间，LED驱动器针对每个LED串确定代表将相应LED串的尾部电压维持在或接近预定阈值电压所需的输出电压电平的代码值。 在操作模式下，来自校准模式的代码值用于控制电压源以为输出电压提供适当的电平。