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11. 发明授权

US07705689B2 Synchronously stackable double-edge modulated pulse width modulation generators 有权
标题翻译：同步可堆叠双边缘调制脉宽调制发生器
公开(公告)号：US07705689B2
公开(公告)日：2010-04-27
申请号：US12123251
申请日：2008-05-19
申请人： William Todd Harrison , Xuening Li , Stefan Wlodzimierz Wiktor
发明人： William Todd Harrison , Xuening Li , Stefan Wlodzimierz Wiktor
IPC分类号： H03K7/08
CPC分类号： H03K7/08
摘要： Synchronously stackable double-edge modulated pulse width modulation generators are disclosed. An example pulse width modulation generator includes a ramp generator to generate first and second ramp signals that interact to form a virtual ramp signal; and a comparator module coupled to the ramp generator configured to produce a pulse width modulated signal based on a comparison between the virtual ramp signal and an input signal.
摘要翻译：公开了同步可堆叠的双边缘调制脉宽调制发生器。示例性脉冲宽度调制发生器包括斜坡发生器，用于产生相互作用以形成虚拟斜坡信号的第一和第二斜坡信号; 以及耦合到所述斜坡发生器的比较器模块，其被配置为基于所述虚拟斜坡信号和输入信号之间的比较来产生脉宽调制信号。

12. 发明授权

US07259687B2 System and method for distributing module phase information 有权
公开(公告)号：US07259687B2
公开(公告)日：2007-08-21
申请号：US11255312
申请日：2005-10-21
申请人： Stefan W. Wiktor , Xuening Li
发明人： Stefan W. Wiktor , Xuening Li
IPC分类号： G08B21/00 , H03K13/02
CPC分类号： H02J1/102
摘要： A multi-module DC-DC converter provides synchronization between modules based on identification of a module within a chain. A resistor network can be used for the chain so that each module obtains a particular voltage based on its position within the chain. A master module provides a source current to drive the chain so that each module can determine its relative position in the chain based on voltage readings. With this configuration, a master module can determine how many modules are in the chain, and each slave module can determine its relative position in the chain. The module information contributes to synchronization between the modules for use in current ripple cancellation, for example, in the multi-module DC-DC converter.

13. 发明申请

US20060043948A1 Load transient frequency modulation in fixed frequency PWM regulator 审中-公开
标题翻译：在固定频率PWM调节器中负载瞬态频率调制
公开(公告)号：US20060043948A1
公开(公告)日：2006-03-02
申请号：US10930449
申请日：2004-08-30
申请人： Xuening Li , Stefan Wiktor
发明人： Xuening Li , Stefan Wiktor
IPC分类号： G05F1/40
CPC分类号： H02M3/158
摘要： A regulator circuit to regulate a voltage for a load includes a sensing circuit to sense a charge in voltage for the load, a variable frequency circuit to output a signal having a frequency component; and a control circuit responsive to the sensing circuit to control the variable frequency circuit by changing the frequency component and the voltage.
摘要翻译：用于调节负载电压的调节器电路包括感测电路，用于检测负载的电压，变频电路输出具有频率分量的信号; 以及响应于感测电路的控制电路，通过改变频率分量和电压来控制可变频率电路。

14. 发明申请

US20050128005A1 Transconductance amplifier with multi-emitter structure for current balance in a multi-phase regulator 失效
标题翻译：具有多发射极结构的跨导放大器，用于多相调节器中的电流平衡
公开(公告)号：US20050128005A1
公开(公告)日：2005-06-16
申请号：US10803006
申请日：2004-03-17
申请人： Xuening Li , Thomas Jochum
发明人： Xuening Li , Thomas Jochum
IPC分类号： H03F1/56 , H03F3/04 , H03F3/347 , H03F3/45
CPC分类号： H03F3/45085 , H03F1/56 , H03F3/04 , H03F3/347 , H03F2200/363
摘要： A transconductance amplifier with multi-emitter structure for balancing current of a multi-phase regulator including multiple transistors, a bias current device, multiple current mirrors, and multiple current sources. Each transistor has first and second current terminals and a current control terminal receiving a corresponding one of multiple sense voltages. Each sense voltage is indicative of output inductor current of a corresponding phase of the multi-phase regulator. The bias current device is coupled to the first current terminal of each transistor. Each current mirror has an input coupled to a second current terminal of a corresponding transistor and an output coupled to a corresponding one of multiple correction nodes. Each current source is coupled to a corresponding one of multiple correction nodes. In this manner, each correction node provides a correction current for a corresponding phase of the regulator.
摘要翻译：具有多发射极结构的跨导放大器，用于平衡多个晶体管的多相调节器的电流，偏置电流器件，多个电流镜和多个电流源。每个晶体管具有第一和第二电流端子和电流控制端子，其接收多个感测电压中相应的一个。每个感测电压表示多相调节器的相应相位的输出电感器电流。偏置电流装置耦合到每个晶体管的第一电流端子。每个电流镜具有耦合到相应晶体管的第二电流端子的输入端和耦合到多个校正节点中对应的一个的输出端。每个电流源耦合到多个校正节点中的对应的一个。以这种方式，每个校正节点为调节器的相应相位提供校正电流。

15. 发明授权

US09124177B2 Systems and methods of smooth light load operation in a DC/DC converter 有权
标题翻译：在DC / DC转换器中平滑轻载操作的系统和方法
公开(公告)号：US09124177B2
公开(公告)日：2015-09-01
申请号：US12854097
申请日：2010-08-10
申请人： Weidong Zhu , Xuening Li , Hal Chen , Wenkai Wu
发明人： Weidong Zhu , Xuening Li , Hal Chen , Wenkai Wu
IPC分类号： G05F1/00 , H02M3/158 , H02M1/00
CPC分类号： H02M3/1588 , H02M2001/0032 , Y02B70/1466 , Y02B70/16
摘要： Systems and devices for smooth light load operation in a DC/DC converter are presented. The disclosed systems and methods enable smooth discontinuous conduction mode (DCM)/continuous conduction mode (CCM) transition. The disclosed systems and methods of smooth light load operation in a DC/DC converter may also avoid the generation of sub-harmonics during light load operation. In an example embodiment, a rising ramp is used to control the ON time of the converter oscillator, while a falling ramp controls the OFF time. During DCM operation, the minimum value of the falling ramp is clamped. The clamping of the falling ramp ensures a substantially similar level of the error amplifier output in both CCM and DCM and avoids disturbances caused by a difference in the error amplifier outputs between the modes.
摘要翻译：介绍了在DC / DC转换器中平滑轻载操作的系统和设备。所公开的系统和方法实现了平滑的不连续导通模式（DCM）/连续导通模式（CCM）转换。所公开的在DC / DC转换器中平滑轻载操作的系统和方法也可以避免在轻负载操作期间产生次谐波。在示例实施例中，上升斜坡用于控制转换器振荡器的导通时间，而下降斜坡控制OFF时间。在DCM操作期间，下降斜坡的最小值被钳位。下降斜坡的钳位确保CCM和DCM中误差放大器输出的电平基本相似，并避免由模式之间误差放大器输出的差异引起的干扰。

16. 发明申请

US20080158922A1 DISTRIBUTING TIME SLOTS IN PARALLEL CONFIGURED, SWITCHING POWER SUPPLIES 有权
标题翻译：分配配置并行配置的时间段，切换电源
公开(公告)号：US20080158922A1
公开(公告)日：2008-07-03
申请号：US11684017
申请日：2007-03-09
申请人： William Todd Harrison , Xuening Li
发明人： William Todd Harrison , Xuening Li
IPC分类号： H02J1/10
CPC分类号： H02J1/10
摘要： A multi-phase power system including a plurality of Pulse Width Modulation (PWM) controllers is provided, including a first PWM controller and at least one second PWM controller. The first PWM controller is configured to generate at least one first output signal based on a first clock signal, and to insert at least one synchronizing pulse into the first clock signal, the synchronizing pulse having a predetermined characteristic differing from pulses of the first clock signal, and to provide the first clock signal including the synchronizing pulse to the second PWM controller. The second PWM controller is configured to generate at least one second output signal based on the first clock signal, and to synchronize the generation of the first and second output signals using the synchronizing pulse within the first clock signal, thereby maintaining a predetermined phase relationship between the first and second output signals. The synchronizing pulse may be, for example, a skinny pulse or a pulse having a magnitude larger than the pulses of the first clock signal.
摘要翻译：提供了包括多个脉宽调制（PWM）控制器的多相电力系统，包括第一PWM控制器和至少一个第二PWM控制器。第一PWM控制器被配置为基于第一时钟信号产生至少一个第一输出信号，并且将至少一个同步脉冲插入到第一时钟信号中，该同步脉冲具有与第一时钟信号的脉冲不同的预定特性并且向第二PWM控制器提供包括同步脉冲的第一时钟信号。第二PWM控制器被配置为基于第一时钟信号产生至少一个第二输出信号，并且使用第一时钟信号内的同步脉冲同步第一和第二输出信号的产生，从而保持第一时钟信号之间的预定相位关系第一和第二输出信号。同步脉冲可以是例如瘦的脉冲或具有大于第一时钟信号的脉冲的幅度的脉冲。

17. 发明申请

US20080042634A1 DOUBLE-EDGE, STACKABLE PWM WITH BUILT-IN FEEDFORWARD 有权
标题翻译：双边，带内置式前置放大器的堆叠PWM
公开(公告)号：US20080042634A1
公开(公告)日：2008-02-21
申请号：US11695181
申请日：2007-04-02
申请人： William Todd Harrison , Xuening Li , Stefan W. Wiktor , Larry Joe Wofford
发明人： William Todd Harrison , Xuening Li , Stefan W. Wiktor , Larry Joe Wofford
IPC分类号： H02J1/10
CPC分类号： H02M1/084 , H02M2001/0022
摘要： A method and apparatus for use in a multi-phase power system. The power system is of the type having a plurality of Pulse Width Modulation (PWM) controllers including a first PWM controller and at least one second PWM controller. The first PWM controller generates at least one first PWM output signal based on a cyclic signal having a cyclically recurring parameter, and provides the cyclic signal including the cyclically recurring parameter to the second PWM controller. The second PWM controller generates at least one second PWM output signal based on the cyclic signal, and synchronizes the generation of the first and second output signals using the cyclically recurring parameter within the cyclic signal, thereby maintaining a predetermined phase relationship between the first and second output signals. The second PWM controller generates a cyclic, triangular RAMP waveform signal having a series of periods, the RAMP waveform having in each period a signal rising portion and a signal falling portion, and compares the RAMP waveform against an error signal to generate the second PWM signal, the RAMP waveform rising portion and falling portion being generated by charging and discharging, respectively, a capacitor. A feedforward path is provided by setting a charging current for the capacitor that is proportional to an input voltage.
摘要翻译：一种用于多相电力系统的方法和装置。电力系统是具有多个脉冲宽度调制（PWM）控制器的类型，包括第一PWM控制器和至少一个第二PWM控制器。第一PWM控制器基于具有周期性循环参数的循环信号产生至少一个第一PWM输出信号，并且将包括循环周期参数的循环信号提供给第二PWM控制器。第二PWM控制器基于循环信号产生至少一个第二PWM输出信号，并且使用循环信号内的循环循环参数来同步第一和第二输出信号的产生，由此保持第一和第二输出信号之间的预定相位关系输出信号。第二PWM控制器产生具有一系列周期的循环三角形RAMP波形信号，RAMP波形在每个周期中具有信号上升部分和信号下降部分，并且将RAMP波形与误差信号进行比较，以产生第二PWM信号分别由充电和放电产生RAMP波形上升部分和下降部分的电容器。通过设置与输入电压成比例的电容器的充电电流来提供前馈路径。

18. 发明申请

US20070091658A1 System and method for distributing module phase information 有权
标题翻译：用于分发模块相位信息的系统和方法
公开(公告)号：US20070091658A1
公开(公告)日：2007-04-26
申请号：US11255312
申请日：2005-10-21
申请人： Stefan Wiktor , Xuening Li
发明人： Stefan Wiktor , Xuening Li
IPC分类号： H02M7/48
CPC分类号： H02J1/102
摘要： A multi-module DC-DC converter provides synchronization between modules based on identification of a module within a chain. A resistor network can be used for the chain so that each module obtains a particular voltage based on its position within the chain. A master module provides a source current to drive the chain so that each module can determine its relative position in the chain based on voltage readings. With this configuration, a master module can determine how many modules are in the chain, and each slave module can determine its relative position in the chain. The module information contributes to synchronization between the modules for use in current ripple cancellation, for example, in the multi-module DC-DC converter.
摘要翻译：多模块DC-DC转换器基于链中的模块的识别来提供模块之间的同步。电阻网络可用于链条，以便每个模块基于其在链条内的位置获得特定的电压。主模块提供源电流来驱动链，使得每个模块可以基于电压读数确定其在链中的相对位置。通过这种配置，主模块可以确定链中有多少模块，每个从模块可以确定其在链中的相对位置。模块信息有助于用于电流纹波消除的模块之间的同步，例如在多模块DC-DC转换器中。

19. 发明授权

US06922044B2 Synchronization of multiphase synthetic ripple voltage regulator 有权
标题翻译：多相合成波纹电压调节器的同步
公开(公告)号：US06922044B2
公开(公告)日：2005-07-26
申请号：US10673684
申请日：2003-09-29
申请人： Michael M. Walters , Xuening Li , Thomas A. Jochum
发明人： Michael M. Walters , Xuening Li , Thomas A. Jochum
IPC分类号： H02M3/155 , G05F5/00 , H02J1/10 , H02M3/156 , H02M3/158 , H02M3/28 , G05F1/40
CPC分类号： H02J1/102 , H02M3/156 , H02M3/1584
摘要： A multiphase ripple voltage regulator generator employs a hysteretic comparator referenced to upper and lower voltage thresholds. The hysteretic comparator monitors a master ripple voltage waveform developed across a capacitor supplied with a current proportional to the difference between the output voltage and either the input voltage or ground. The output of the hysteretic comparator generates a master clock signal that is sequentially coupled to PWM latches, the states of which define the durations of respective components of the synthesized ripple voltage. A respective PWM latch has a first state initiated by a selected master clock signal and terminated by an associated phase voltage comparator that monitors a respective phase node voltage.
摘要翻译：多相纹波电压调节器采用基于上限和下限电压阈值的滞后比较器。迟滞比较器监视在电容器上产生的主纹波电压波形，其电流与输出电压和输入电压或地之间的差成比例。迟滞比较器的输出产生顺序耦合到PWM锁存器的主时钟信号，其状态限定合成纹波电压的各个分量的持续时间。相应的PWM锁存器具有由所选择的主时钟信号启动的第一状态，并且由相关联的相位电压比较器终止，监视相应的相位节点电压。

20. 发明申请

US20120032748A1 Systems and Methods of Ripple Reduction in a DC/DC Converter 有权
标题翻译： DC / DC转换器中波纹减少的系统和方法
公开(公告)号：US20120032748A1
公开(公告)日：2012-02-09
申请号：US12849799
申请日：2010-08-03
申请人： Xuening Li , Hal Chen , Weidong Zhu , Wenkai Wu
发明人： Xuening Li , Hal Chen , Weidong Zhu , Wenkai Wu
IPC分类号： H03K7/08 , G05F1/10 , H03K5/12
CPC分类号： H03K5/1252
摘要： Systems and devices for ripple reduction in a DC/DC converter are presented. The disclosed systems and methods enable ripple reduction in discontinuous conduction mode (DCM) operation. In DCM, the inductor current peak to peak ripple may be reduced based on the load current. To achieve the reduction of the inductor peak to peak current ripple, a digital counter is used to count the time between consecutive PWM pulses. The digital output of the counter is used to control the pulse width modulation. As the digital output of the counter increases, the PWM on-time decreases. Since the PWM pulse is demanded by the load in DCM mode, the peak to peak inductor ripple is modulated by the counter, or, in turn, modulated by the load current.
摘要翻译：介绍了DC / DC转换器中纹波降低的系统和器件。所公开的系统和方法使得不连续导通模式（DCM）操作中的纹波降低。在DCM中，电感电流峰峰值纹波可能会根据负载电流而减小。为了实现电感峰值电流纹波的降低，使用数字计数器对连续PWM脉冲之间的时间进行计数。计数器的数字输出用于控制脉宽调制。随着计数器的数字输出增加，PWM导通时间减小。由于PWM模式下的负载要求PWM脉冲，所以峰值电感纹波由计数器调制，或由负载电流调制。

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