公开(公告)号：US20120278658A1

公开(公告)日：2012-11-01

申请号：US13095269

申请日：2011-04-27

Applicant: Shi Han ,  Yingnong Dang ,  Song Ge ,  Dongmei Zhang ,  Bin Zhao ,  Feng Liang ,  Chao Bian ,  Xiangpeng Zhao ,  Cong Chen ,  Hang Li ,  Prashant Ratanchandani

Inventor： Shi Han ,  Yingnong Dang ,  Song Ge ,  Dongmei Zhang ,  Bin Zhao ,  Feng Liang ,  Chao Bian ,  Xiangpeng Zhao ,  Cong Chen ,  Hang Li ,  Prashant Ratanchandani

IPC: G06F11/36

CPC classification number: G06F11/3636

Abstract: Execution traces are collected from multiple execution instances that exhibit performance issues such as slow execution. Call stacks are extracted from the execution traces, and the call stacks are mined to identify frequently occurring function call patterns. The call patterns are then clustered, and used to identify groups of execution instances whose performance issues may be caused by common problematic program execution patterns.

Abstract translation: 从执行缓慢执行的性能问题的多个执行实例中收集执行跟踪。 从执行跟踪中提取调用堆栈，并且调用堆栈被挖掘以识别经常出现的函数调用模式。 呼叫模式然后被聚集，并用于识别其性能问题可能由常见的有问题的程序执行模式引起的执行实例组。

公开(公告)号：US20120249095A1

公开(公告)日：2012-10-04

申请号：US13216565

申请日：2011-08-24

Applicant: Bin Zhao ,  Jack Cornish ,  Victor Lee ,  Brian Horng

Inventor： Bin Zhao ,  Jack Cornish ,  Victor Lee ,  Brian Horng

IPC: G05F1/10

CPC classification number: H02M1/36 ,  H02M3/00

Abstract: In one general aspect, a power supply circuit can include a power stage configured to be coupled to a power source and configured to deliver an output voltage to a load circuit, and can include a comparator coupled to the power stage and configured to receive a reference voltage. The power supply circuit can also include a hysteresis control circuit configured to receive at least one of a feedback voltage or a reference voltage and configured to change a hysteresis of the comparator in response to the at least one of the feedback voltage or the reference voltage during a soft-start of the power supply circuit.

Abstract translation: 在一个一般方面，电源电路可以包括功率级，其被配置为耦合到电源并且被配置为将输出电压递送到负载电路，并且可以包括耦合到功率级并被配置为接收参考的比较器 电压。 电源电路还可以包括滞后控制电路，其被配置为接收反馈电压或参考电压中的至少一个，并且被配置为响应于反馈电压或参考电压中的至少一个响应比较器的迟滞 电源电路的软启动。

公开(公告)号：US08188771B2

公开(公告)日：2012-05-29

申请号：US12537443

申请日：2009-08-07

Applicant: Bin Zhao ,  Andrew M. Kameya ,  Victor K. Lee

Inventor： Bin Zhao ,  Andrew M. Kameya ,  Victor K. Lee

IPC: H03B19/00 ,  H03K7/08

Abstract: 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：US08179051B2

公开(公告)日：2012-05-15

申请号：US12367672

申请日：2009-02-09

Applicant: Bin Zhao

Inventor： Bin Zhao

IPC: H05B37/02

CPC classification number: H05B33/0827 ,  H05B33/0815 ,  H05B33/0857

Abstract: A power management technique in a light emitting diode (LED) system is disclosed. The LED system includes a plurality of LED driver connected in series, each LED driver configured to regulate the current flowing through a corresponding subset of a plurality of LED strings. Each LED driver determines the minimum tail voltage of the LED strings of the corresponding subset, compares the determined minimum tail voltage with an indicator of a minimum tail voltage of one or more other subsets provided from an upstream LED driver in the series, and then provides an indicator of the lower of the two tail voltages to the downstream LED driver. In this manner an indicator of the minimum tail voltage of the plurality of LED strings is cascaded through the series. A feedback controller monitors the minimum tail voltage represented by the cascaded indicator and accordingly adjusts an output voltage provided to the head ends of the plurality of LED strings.

Abstract translation: 公开了一种发光二极管（LED）系统中的电源管理技术。 LED系统包括串联连接的多个LED驱动器，每个LED驱动器被配置为调节流过多个LED串的相应子集的电流。 每个LED驱动器确定相应子集的LED串的最小尾电压，将所确定的最小尾电压与从该系列中的上游LED驱动器提供的一个或多个其他子集的最小尾电压的指示器进行比较，然后提供 指示下游LED驱动器的两个尾部电压中较低的一个。 以这种方式，多个LED串的最小尾电压的指示器通过该系列级联。 反馈控制器监视由级联指示器表示的最小尾电压，并相应地调整提供给多个LED串的头端的输出电压。

公开(公告)号：US20120107549A1

公开(公告)日：2012-05-03

申请号：US13284273

申请日：2011-10-28

Applicant: Qingwu Wang ,  Guiquan Pan ,  Bin Zhao

Inventor： Qingwu Wang ,  Guiquan Pan ,  Bin Zhao

IPC: B32B27/34 ,  B32B7/12 ,  B05D5/06 ,  C09K9/02 ,  B32B3/02 ,  B32B38/00 ,  B82Y30/00

CPC classification number: C09K9/02 ,  B05D5/06 ,  B05D2504/00 ,  B32B3/02 ,  B32B7/12 ,  B32B27/34 ,  B32B2307/40 ,  B82Y30/00 ,  E04D7/00 ,  Y10T428/239 ,  Y10T428/31725

Abstract: Devices using thermochromic materials, where the thermochromic materials are stable for long time exposure to UV light and heat, have higher index of refraction, can be produced cost-effectively at large scale for large surface coating, allow convenient installation and a fast color switch are disclosed hereinbelow. Also disclosed are methods of use and fabrication.

Abstract translation: 使用热变色材料的设备，其中热变色材料长时间暴露于紫外光和热下是稳定的，具有较高的折射率，可大规模生产成本效益大的表面涂层，允许方便的安装和快速的颜色切换 下面公开。 还公开了使用和制造的方法。

公开(公告)号：US08169245B2

公开(公告)日：2012-05-01

申请号：US12703249

申请日：2010-02-10

Applicant: Bin Zhao

Inventor： Bin Zhao

IPC: H03K3/017

CPC classification number: H05B33/0818 ,  G06F1/025 ,  Y02B20/346

Abstract: A pulse width modulation (PWM) signal generator generates a PWM signal with an adjustable PWM duty based on a programmable or otherwise adjustable value. In response to a change or update to this value, the PWM signal generator initiates a duty transition process that generates a series of groups of PWM cycles that gradually transition from the original duty to the new duty. Each group includes a corresponding set of a predetermined number of PWM cycles that is repeated one or more times over a predetermined duration for the group. Each set has a certain proportion of PWM cycles having the new duty to PWM cycles having the original duty, whereby the proportion increases for each successive group of the series. This gradual transition in the PWM signal from the original duty to the new duty effectively provides an effective higher duty resolution for the PWM signal generator during the duty transition.

Abstract translation: 脉冲宽度调制（PWM）信号发生器基于可编程或其他可调整的值产生具有可调PWM占空比的PWM信号。 响应于该值的更改或更新，PWM信号发生器启动占空比转换过程，该过程产生逐渐从原始占空比转换到新占空比的一系列PWM周期。 每个组包括在该组的预定持续时间内重复一次或多次的预定数量的PWM周期的相应组。 每组具有一定比例的PWM周期，其具有具有原始占空比的PWM周期的新占空比，由此该系列的每个连续组的比例增加。 在占空比过渡期间，PWM信号从原始占空比到新占空比的逐渐转换有效地为PWM信号发生器提供了更高的占空比分辨率。

公开(公告)号：US08049439B2

公开(公告)日：2011-11-01

申请号：US12363607

申请日：2009-01-30

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

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

IPC: H05B37/02

CPC classification number: H05B33/0815 ,  H05B33/0827 ,  Y02B20/347

Abstract: 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.

Abstract translation: 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。

公开(公告)号：US08035315B2

公开(公告)日：2011-10-11

申请号：US12340985

申请日：2008-12-22

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

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

IPC: H05B37/02 ,  G09G5/00

CPC classification number: H05B33/0818 ,  H05B33/0827 ,  H05B33/0851

Abstract: Power management in a light emitting diode (LED) system having a plurality of LED strings is disclosed. A voltage source provides an output voltage to drive a plurality of LED strings. An LED driver implements a feedback mechanism to monitor the tail voltages of the active LED strings to identify the minimum tail voltage and adjust the output voltage of the voltage source based on the lowest tail voltage. A loop calibration module of the LED driver calibrates the feedback mechanism of the LED driver based on a relationship between a digital code value used to generate a particular output voltage and another digital code value generated based on the minimum tail voltage resulting from the particular output voltage.

Abstract translation: 公开了具有多个LED串的发光二极管（LED）系统中的电源管理。 电压源提供输出电压以驱动多个LED串。 LED驱动器实现反馈机制来监测有源LED串的尾部电压以识别最小尾电压，并且基于最低的尾部电压来调节电压源的输出电压。 LED驱动器的回路校准模块基于用于产生特定输出电压的数字代码值与基于由特定输出电压产生的最小尾部电压产生的另一数字代码值之间的关系来校准LED驱动器的反馈机制 。

公开(公告)号：US07843242B1

公开(公告)日：2010-11-30

申请号：US12537692

申请日：2009-08-07

Applicant: Bin Zhao

Inventor： Bin Zhao

IPC: H03K3/017

CPC classification number: G06F1/025 ,  H03K5/15013 ,  H03K7/08

Abstract: A pulse width modulation (PWM) signal generator generates multiple output PWM signals from an input PWM signal, whereby each output PWM signal has a frequency and duty ratio substantially similar to the input PWM signal and each output PWM signal is phase-shifted in relation to the other output PWM signals. The PWM signal generator samples a PWM cycle of the input PWM signal to determine various PWM parameters representative of the duration of the active portion of the sampled PWM cycle and the total duration of the sampled PWM cycle. The PWM signal generator then uses the PWM parameters to generate corresponding PWM cycles for the output PWM signals using a set of two independent counters. This process of sampling a PWM cycle of the input PWM signal and generating the output PWM signals based on the PWM parameters resulting from the sampling process can be repeated for one or more iterations.

Abstract translation: 脉冲宽度调制（PWM）信号发生器从输入PWM信号产生多个输出PWM信号，由此每个输出PWM信号的频率和占空比基本上类似于输入的PWM信号，并且每个输出PWM信号相对于 另外输出PWM信号。 PWM信号发生器对输入PWM信号的PWM周期进行采样，以确定表示采样PWM周期的有效部分的持续时间和采样PWM周期的总持续时间的各种PWM参数。 PWM信号发生器然后使用PWM参数来使用一组两个独立计数器为输出PWM信号产生相应的PWM周期。 对采样过程产生的PWM参数进行采样输入PWM信号的PWM周期并产生输出PWM信号的过程可重复进行一次或多次迭代。

公开(公告)号：US20100201279A1

公开(公告)日：2010-08-12

申请号：US12690972

申请日：2010-01-21

Applicant: Bin Zhao

Inventor： Bin Zhao

IPC: H05B37/02

CPC classification number: H05B33/0818 ,  H05B33/0857

Abstract: A light emitting diode (LED) system implements a power management technique. The LED system includes a plurality of LED drivers connected in series, each LED driver configured to regulate the current flowing through a corresponding subset of a plurality of LED strings. Each LED driver determines the tail voltages of the one or more LED strings of the corresponding subset. Each LED driver, except for the first LED driver in the series, also receives a voltage representative of the minimum tail voltage of the other subsets regulated by the upstream LED drivers. Each LED driver then provides the lowest of the voltage received from the upstream LED driver and the one or more tail voltages of the corresponding subset to the downstream LED driver. In this manner a voltage representative of the minimum tail voltage of the plurality of LED strings is cascaded through the series. A feedback controller monitors the minimum tail voltage represented by this cascaded voltage and accordingly adjusts an output voltage provided to the head ends of the plurality of LED strings.

Abstract translation: 发光二极管（LED）系统实现电源管理技术。 LED系统包括串联连接的多个LED驱动器，每个LED驱动器配置成调节流过多个LED串的相应子集的电流。 每个LED驱动器确定相应子集的一个或多个LED串的尾部电压。 除了该系列中的第一个LED驱动器之外，每个LED驱动器还接收代表由上游LED驱动器调节的其他子集的最小尾电压的电压。 然后，每个LED驱动器将从上游LED驱动器接收的最低电压和相应子集的一个或多个尾部电压提供给下游LED驱动器。 以这种方式，表示多个LED串的最小尾电压的电压通过该系列级联。 反馈控制器监视由该级联电压表示的最小尾电压，并相应地调节提供给多个LED串的头端的输出电压。