公开(公告)号：US07312668B2

公开(公告)日：2007-12-25

申请号：US10559837

申请日：2004-06-08

申请人： Qiong M. Li ,  Demetri Giannopoulos

发明人： Qiong M. Li ,  Demetri Giannopoulos

IPC分类号： H03B27/00

CPC分类号： H03K3/0315 ,  H03K5/133 ,  H03K7/08 ,  H03K2005/00026 ,  H03K2005/00032 ,  H03L7/0812

摘要： A high resolution pulse width modulation (PWM) or voltage controlled output (DCO) generator is disclosed. The resolution is increased over that of the circuit clock by delaying the generated signal through a series of delays, all of which are controlled by a delay locked loop. The delays are a small fraction of the clock period, thus providing resolution greater than that of the circuit clock.

摘要翻译： 公开了一种高分辨率脉宽调制（PWM）或压控输出（DCO）发生器。 通过将生成的信号延迟一系列延迟，所有这些都由延迟锁定环控制，分辨率比电路时钟的分辨率增加。 延迟是时钟周期的一小部分，因此提供比电路时钟更大的分辨率。

公开(公告)号：US06577076B2

公开(公告)日：2003-06-10

申请号：US09946062

申请日：2001-09-04

申请人： Qiong M. Li ,  Demetri Giannopoulos ,  Ihor T. Wacyk

发明人： Qiong M. Li ,  Demetri Giannopoulos ,  Ihor T. Wacyk

IPC分类号： G05F100

CPC分类号： H05B41/2858 ,  H05B41/2828 ,  H05B41/36 ,  Y10S315/04

摘要： An adaptive compensation circuit for controlling a universal lamp driver coupled to a lamp is disclosed. The adaptive compensation circuit utilizes an identification of a lamp type of the lamp to thereby generate a signal indicative of a time constant of the lamp. The adaptive compensation circuit subsequently determines a zero position and a pair of pole positions corresponding to the time constant, and generates a control voltage in response to a determination of the zero position and the pair of pole positions. The control voltage facilitates an operation of the universal lamp driver to stably provide a lamp current to the lamp.

摘要翻译： 公开了一种用于控制耦合到灯的通用灯驱动器的自适应补偿电路。 自适应补偿电路利用灯的灯类型的识别，从而产生指示灯的时间常数的信号。 自适应补偿电路随后确定对应于时间常数的零位置和一对极位置，并且响应于零位置和一对极位置的确定而产生控制电压。 控制电压有助于通用灯驱动器的操作，以稳定地向灯提供灯电流。

公开(公告)号：US07701194B2

公开(公告)日：2010-04-20

申请号：US11831237

申请日：2007-07-31

申请人： Cheng Hsun Lin ,  Qiong M. Li ,  Eric Labbe

发明人： Cheng Hsun Lin ,  Qiong M. Li ,  Eric Labbe

IPC分类号： G01R23/00

CPC分类号： H03K7/08 ,  H03F3/2173 ,  H03F2200/03 ,  H03F2200/351 ,  H03F2200/375

摘要： A system for detecting a direct current (DC) component of a pulse-width modulated (PWM) signal includes a modulator configured to provide at least one PWM signal to an input of an amplifier. A DC detector is configured to detect a DC component of a selected one of the at least one PWM signal as a function of a switching frequency of the selected PWM signal. The DC detector provides at least one report signal that indicates a level of the DC component of the selected PWM signal relative to a predetermined threshold.

摘要翻译： 用于检测脉冲宽度调制（PWM）信号的直流（DC）分量的系统包括被配置为向放大器的输入提供至少一个PWM信号的调制器。 DC检测器被配置为根据所选择的PWM信号的开关频率来检测所述至少一个PWM信号中所选择的一个的DC分量。 DC检测器提供至少一个报告信号，其指示所选择的PWM信号相对于预定阈值的DC分量的电平。

公开(公告)号：US20080054950A1

公开(公告)日：2008-03-06

申请号：US11831237

申请日：2007-07-31

申请人： CHENG HSUN LIN ,  Qiong M. Li ,  Eric Labbe

发明人： CHENG HSUN LIN ,  Qiong M. Li ,  Eric Labbe

IPC分类号： H03K5/153

CPC分类号： H03K7/08 ,  H03F3/2173 ,  H03F2200/03 ,  H03F2200/351 ,  H03F2200/375

摘要： A system for detecting a direct current (DC) component of a pulse-width modulated (PWM) signal includes a modulator configured to provide at least one PWM signal to an input of an amplifier. A DC detector is configured to detect a DC component of a selected one of the at least one PWM signal as a function of a switching frequency of the selected PWM signal. The DC detector provides at least one report signal that indicates a level of the DC component of the selected PWM signal relative to a predetermined threshold.

摘要翻译： 用于检测脉冲宽度调制（PWM）信号的直流（DC）分量的系统包括被配置为向放大器的输入提供至少一个PWM信号的调制器。 DC检测器被配置为根据所选择的PWM信号的开关频率来检测所述至少一个PWM信号中所选择的一个的DC分量。 DC检测器提供至少一个报告信号，其指示所选择的PWM信号相对于预定阈值的DC分量的电平。

公开(公告)号：US20090174485A1

公开(公告)日：2009-07-09

申请号：US11970289

申请日：2008-01-07

申请人： James Teng ,  Qiong M. Li ,  Cetin Kaya

发明人： James Teng ,  Qiong M. Li ,  Cetin Kaya

IPC分类号： H03F1/52 ,  H03F3/217

CPC分类号： H03F3/2173 ,  H03F1/523 ,  H03F2200/03 ,  H03F2200/351

摘要： Two transistors of a class D output stage are driven by complementary, variable duty cycle signals PWM+ and PWM−. When the pulse width of the PWM+ signal becomes too narrow for reliable operation of prior art over-current protection circuits sensing the drain to source voltage of FET1 driven by PWM+, a Narrow Pulse Detector generates a signal indicative of this narrow pulse condition. A Negative Current Sense circuit measures the drain to source voltage across FET2 during the much longer conduction time of FET2 driven by PWM−. Because of the energy stored in the series inductor coupled to the output of the class D stage, a negative current flows through this FET2 during its conduction time. The resulting drain to source voltage of FET2 is measured and compared to a threshold. If the voltage indicative of current is over the threshold, and the Narrow Pulse Detector output indicates a narrow pulse condition, then an inhibit signal is generated which reduces current. A second Negative Current Sense circuit is utilized to similarly detect over-current conditions when the pulse width of PWM− becomes too narrow for reliable operation of prior art over-current protection circuits, thus protecting both FETs in the class D output stage from excessive current.

摘要翻译： D类输出级的两个晶体管由互补的可变占空比信号PWM +和PWM-驱动。 当PWM +信号的脉冲宽度变得太窄，以便于感测由PWM +驱动的FET1的漏极 - 源极电压的现有技术的过电流保护电路的可靠操作时，窄脉冲检测器产生指示该窄脉冲条件的信号。 在由PWM驱动的FET2的更长的导通时间内，负电流检测电路测量FET2两端的漏源电压。 由于存储在串联电感器中的能量耦合到D级的输出端，所以在其导通时间期间，负电流流过该FET2。 测量FET2的所得到的源极到源极电压并将其与阈值进行比较。 如果指示电流的电压超过阈值，并且窄脉冲检测器输出指示窄脉冲条件，则产生减少电流的禁止信号。 使用第二负电流检测电路来类似地检测当PWM的脉冲宽度变得太窄以致于现有技术的过电流保护电路的可靠操作时的过电流状况，从而保护D类输出级中的两个FET免受过大的电流 。

公开(公告)号：US20080036430A1

公开(公告)日：2008-02-14

申请号：US11479035

申请日：2006-06-30

申请人： Qiong M. Li ,  Jeffrey W. Berwick ,  Eric Christophe Labbe

发明人： Qiong M. Li ,  Jeffrey W. Berwick ,  Eric Christophe Labbe

IPC分类号： G05F1/00

CPC分类号： H02M3/157

摘要： An apparatus for controlling a power converter operating in response to a modulating signal during successive switching cycles includes: (a) A signal sensor coupled with the converter and sensing an extant signal during the extant cycle. (b) A signal level predictor coupled for receiving a reference signal and establishing a predicted level for the extant switching cycle. (c) A comparer coupled with the signal sensor and the signal level predictor for presenting a first output signal when the extant signal and the predicted signal level have a first relationship and for presenting a second output signal when the extant signal and the predicted signal level have a second relationship. (d) A control unit coupled with the comparer and with the converter for interrupting presentation of the modulating signal to the converter device when the comparing unit presents a selected one of the first and second output signals.

摘要翻译： 用于控制在连续切换周期期间响应于调制信号而工作的功率转换器的装置包括：（a）与转换器耦合的信号传感器，并在现存循环期间感测现存信号。 （b）信号电平预测器，用于接收参考信号并建立用于现存切换周期的预测电平。 （c）与信号传感器和信号电平预测器耦合的比较器，用于当存在信号和预测信号电平具有第一关系时呈现第一输出信号，并且当存在信号和预测信号电平时呈现第二输出信号 有第二个关系。 （d）当所述比较单元呈现所述第一和第二输出信号中的所选择的一个时，与所述比较器和所述转换器耦合的控制单元用于中断所述调制信号向所述转换器装置的呈现。

公开(公告)号：US07327177B2

公开(公告)日：2008-02-05

申请号：US10537577

申请日：2003-11-25

申请人： Qiong M. Li

发明人： Qiong M. Li

IPC分类号： H03K3/017

CPC分类号： H04L25/4902 ,  H03K7/08

摘要： A method and apparatus is provided to generate a pulse-width modulated (PWM) with enhanced features in accordance with a pre-determined protocol using a standard microprocessor. The method and apparatus is able to handle both variable on/off-timing control and multiple-event interrupts. The PWM functions of the present invention are implemented by software in the microprocessor that handles not only on/off events controlled by external pins, but is programmable on/off timing as well.

摘要翻译： 提供了一种方法和装置，以根据使用标准微处理器的预定协议来产生具有增强特征的脉冲宽度调制（PWM）。 该方法和装置能够处理可变开/关定时控制和多事件中断。 本发明的PWM功能由微处理器中的软件来实现，该处理器不仅处理由外部引脚控制的接通/断开事件，而且也是可编程的开/关时序。

公开(公告)号：US07705673B2

公开(公告)日：2010-04-27

申请号：US11970289

申请日：2008-01-07

申请人： James Teng ,  Qiong M. Li ,  Cetin Kaya

发明人： James Teng ,  Qiong M. Li ,  Cetin Kaya

IPC分类号： H03F21/00

CPC分类号： H03F3/2173 ,  H03F1/523 ,  H03F2200/03 ,  H03F2200/351

摘要： Two transistors of a class D output stage are driven by complementary, variable duty cycle signals PWM+ and PWM−. When the pulse width of the PWM+ signal becomes too narrow for reliable operation of prior art over-current protection circuits sensing the drain to source voltage of FET1 driven by PWM+, a Narrow Pulse Detector generates a signal indicative of this narrow pulse condition. A Negative Current Sense circuit measures the drain to source voltage across FET2 during the much longer conduction time of FET2 driven by PWM−. Because of the energy stored in the series inductor coupled to the output of the class D stage, a negative current flows through this FET2 during its conduction time. The resulting drain to source voltage of FET2 is measured and compared to a threshold. If the voltage indicative of current is over the threshold, and the Narrow Pulse Detector output indicates a narrow pulse condition, then an inhibit signal is generated which reduces current. A second Negative Current Sense circuit is utilized to similarly detect over-current conditions when the pulse width of PWM− becomes too narrow for reliable operation of prior art over-current protection circuits, thus protecting both FETs in the class D output stage from excessive current.

摘要翻译： D类输出级的两个晶体管由互补的可变占空比信号PWM +和PWM-驱动。 当PWM +信号的脉冲宽度变得太窄，以便于感测由PWM +驱动的FET1的漏极 - 源极电压的现有技术的过电流保护电路的可靠操作时，窄脉冲检测器产生指示该窄脉冲条件的信号。 在由PWM驱动的FET2的更长的导通时间内，负电流检测电路测量FET2两端的漏源电压。 由于存储在串联电感器中的能量耦合到D级的输出端，所以在其导通时间期间，负电流流过该FET2。 测量FET2的所得到的源极到源极电压并将其与阈值进行比较。 如果指示电流的电压超过阈值，并且窄脉冲检测器输出指示窄脉冲条件，则产生减少电流的禁止信号。 使用第二负电流检测电路来类似地检测当PWM的脉冲宽度变得太窄以致于现有技术的过电流保护电路的可靠操作时的过电流状况，从而保护D类输出级中的两个FET免受过大的电流 。

公开(公告)号：US20120139345A1

公开(公告)日：2012-06-07

申请号：US13106773

申请日：2011-05-12

申请人： Mao Ye ,  Richard Stair ,  Suheng Chen ,  Jinrong Qian ,  Qiong M. Li

发明人： Mao Ye ,  Richard Stair ,  Suheng Chen ,  Jinrong Qian ,  Qiong M. Li

IPC分类号： H02J9/04

CPC分类号： H02J7/0063 ,  H02J7/0068 ,  H02J2007/0059 ,  H02M1/10 ,  H02M1/32 ,  H02M3/1582 ,  Y02T90/127 ,  Y10T307/625

摘要： A power supply system and method for operating same. The power supply system is connectable to receive power from an adapter and supply power to a load. The power supply system includes a rechargeable battery, a buck mode circuit, and a boost mode circuit. A switching circuit switches between the buck mode circuit and boost mode circuit for supplying power to the load. If the power required by the load reaches a first predetermined level related to an adapter overload condition for a first predetermined time, the switching circuit disconnects said buck mode circuit from the load and connects the rechargeable battery and the boost mode circuit to said load. The first predetermined level may be established by a first predetermined percent of the current of a dynamic power management level established by the load, which is related to a power level below that which can be provided by the adapter.

摘要翻译： 供电系统及其运行方法。 电源系统可连接，以从适配器接收电力并向负载供电。 电源系统包括可充电电池，降压模式电路和升压模式电路。 开关电路在降压模式电路和升压模式电路之间切换，以向负载供电。 如果负载所需的功率达到与适配器过载状态相关的第一预定时间的第一预定电平，则开关电路将所述降压模式电路与负载断开，并将可再充电电池和升压模式电路连接到所述负载。 可以通过由负载建立的动态功率管理电平的电流的第一预定百分比来建立第一预定电平，其与低于可由适配器提供的功率电平相关联。

公开(公告)号：US07595615B2

公开(公告)日：2009-09-29

申请号：US11396859

申请日：2006-03-31

申请人： Qiong M. Li ,  Michael Joseph Tsecouras ,  Dale James Skelton ,  James Teng

发明人： Qiong M. Li ,  Michael Joseph Tsecouras ,  Dale James Skelton ,  James Teng

IPC分类号： G06F1/573

CPC分类号： H02M1/32 ,  H02M3/156 ,  H05B6/06 ,  Y10S323/908

摘要： A system and method is provided for providing integrated over-current protection in a switching power supply. In one embodiment, a switching power supply could comprise a gate drive circuit operative to receive a pulse-width modulated (PWM) signal and to drive at least one power field effect transistor (FET) between alternating activated and deactivated states based on a pulse-width of the PWM signal. The switching power supply could also comprise a current sense circuit operative to measure a current associated with the at least one power FET during the activated state. The switching power supply could also comprise a first over-current protection circuit providing a first adjustment to the PWM signal in response to the current being substantially between a first threshold and a second threshold. The second threshold could be greater than the first threshold. The switching power supply could further comprise a second over-current protection circuit providing a second adjustment to the PWM signal in response to the current being substantially greater than the second threshold.

摘要翻译： 提供了一种用于在开关电源中提供集成的过电流保护的系统和方法。 在一个实施例中，开关电源可以包括栅极驱动电路，其操作以接收脉冲宽度调制（PWM）信号并且基于脉冲宽度调制（PWM）信号来驱动交替的激活和去激活状态之间的至少一个功率场效应晶体管（FET） PWM信号的宽度。 开关电源还可以包括电流检测电路，其可操作以在激活状态期间测量与至少一个功率FET相关联的电流。 开关电源还可以包括第一过电流保护电路，其响应于大体上在第一阈值和第二阈值之间的电流而向PWM信号提供第一调整。 第二阈值可能大于第一阈值。 开关电源还可以包括响应于电流基本上大于第二阈值而向PWM信号提供第二调整的第二过电流保护电路。