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1. 发明申请

WO2009114279A3 LED DRIVER WITH DYNAMIC POWER MANAGEMENT 审中-公开
标题翻译：带动态电源管理的LED驱动器
公开(公告)号：WO2009114279A3
公开(公告)日：2009-12-17
申请号：PCT/US2009035284
申请日：2009-02-26
申请人： FREESCALE SEMICONDUCTOR INC , ZHAO BIN , CORNISH JACK W , HORNG BRIAN B , LEE VICTOR K , KAMEYA ANDREW M
发明人： ZHAO BIN , CORNISH JACK W , HORNG BRIAN B , LEE VICTOR K , KAMEYA ANDREW M
IPC分类号： G09G3/32 , G02F1/133 , G09G3/14 , G09G3/36 , H05B37/02
CPC分类号： H05B33/0827 , H05B33/0815 , Y02B20/347
摘要： Power management in a light emitting diode (LED) system (100) having a plurality of LED strings (102) is disclosed. A voltage source provides an output voltage to drive the LED strings (102). An LED driver (114) monitors the tail voltages of the active LED strings to identify the minimum, or lowest, tail voltage and adjusts the output voltage of the voltage source based on the lowest tail voltage. The LED driver (114) can adjust the output voltage so as to maintain the lowest tail voltage at or near a predetermined threshold voltage so as to ensure that the output voltage is sufficient to properly drive each active LED string with a regulated current in view of pulse width modulation (PWM) performance requirements without excessive power consumption.
摘要翻译：公开了具有多个LED串（102）的发光二极管（LED）系统（100）中的电力管理。电压源提供输出电压以驱动LED串（102）。 LED驱动器（114）监视有源LED串的尾电压以识别最小尾电压或最低尾电压，并且基于最低尾电压来调整电压源的输出电压。 LED驱动器（114）可以调节输出电压以便将最低尾电压维持在预定阈值电压或接近预定阈值电压，从而确保输出电压足以适当地驱动每个有源LED串，脉宽调制（PWM）性能要求，而无需过多的功耗。

2. 发明申请

WO2010074879A2 LED DRIVER WITH FEEDBACK CALIBRATION 审中-公开
标题翻译：带有反馈校准的LED驱动器
公开(公告)号：WO2010074879A2
公开(公告)日：2010-07-01
申请号：PCT/US2009065913
申请日：2009-11-25
申请人： FREESCALE SEMICONDUCTOR INC , ZHAO BIN , CORNISH JACK W , HORNG BRIAN B , KAMEYA ANDREW M , KRELLNER JAN , KWOK KENNETH C , LEE VICTOR K , XIN WEIZHUANG W
发明人： ZHAO BIN , CORNISH JACK W , HORNG BRIAN B , KAMEYA ANDREW M , KRELLNER JAN , KWOK KENNETH C , LEE VICTOR K , XIN WEIZHUANG W
IPC分类号： H05B37/02
CPC分类号： H05B33/0818 , H05B33/0827 , H05B33/0851
摘要： Power management in a light emitting diode (LED) system (100) having a plurality of LED strings (105-107) is disclosed. A voltage source (112) provides an output voltage to drive a plurality of LED strings (105-107). An LED driver (104) 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 (112) based on the lowest tail voltage. A loop calibration module (136) of the LED driver (104) calibrates the feedback mechanism of the LED driver (104) 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.
摘要翻译：公开了具有多个LED串（105-107）的发光二极管（LED）系统（100）中的电力管理。电压源（112）提供输出电压以驱动多个LED串（105-107）。 LED驱动器（104）实施反馈机制以监视有源LED串的尾电压以识别最小尾电压并且基于最低尾电压来调整电压源（112）的输出电压。 LED驱动器（104）的环路校准模块（136）基于用于产生特定输出电压的数字代码值与基于该LED产生的另一数字代码值之间的关系校准LED驱动器（104）的反馈机制由特定输出电压产生的最小尾部电压。

3. 发明申请

WO2011017245A2 PULSE WIDTH MODULATION FREQUENCY CONVERSION 审中-公开
标题翻译：脉冲宽度调制频率转换
公开(公告)号：WO2011017245A2
公开(公告)日：2011-02-10
申请号：PCT/US2010044067
申请日：2010-08-02
申请人： FREESCALE SEMICONDUCTOR INC , ZHAO BIN , KAMEYA ANDREW M , LEE VICTOR K
发明人： ZHAO BIN , KAMEYA ANDREW M , LEE VICTOR K
IPC分类号： H03K7/08 , H02M7/48
CPC分类号： H03K7/08
摘要： A pulse width modulation (PWM) frequency converter (100) 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 (100) samples the input PWM signal for a PWM cycle using a sampling clock (112). A filter module (108) 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.
摘要翻译：脉冲宽度调制（PWM）频率转换器（100）将输入PWM信号转换为具有不同频率的输出PWM信号，同时保持基本相等的占空比。 PWM频率转换器（100）使用采样时钟（112）对PWM周期的输入PWM信号进行采样。滤波器模块（108）对所得到的一个或多个PWM参数进行滤波，以补偿由潜在的时钟失配，时钟抖动，环境变化和其他非确定性问题引入的噪声，从而产生滤波后的PWM参数。滤波器模块采用的采样将一个或多个当前PWM参数和先前（或历史）PWM参数之间的差异从较早采样的PWM周期与预定的变化阈值进行比较，以确定一个或多个PWM参数的滤波集合。一个或多个PWM参数的经过滤波的组然后用于产生输出信号的一个或多个相应的PWM周期。

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