公开(公告)号：US08334662B2

公开(公告)日：2012-12-18

申请号：US12558275

申请日：2009-09-11

Applicant: Xuecheng Jin ,  Yu Cheng Chang ,  Yang Li ,  Maofeng Lan ,  John W. Kesterson ,  Xiaoyan Wang ,  Chenghung Pan

Inventor： Xuecheng Jin ,  Yu Cheng Chang ,  Yang Li ,  Maofeng Lan ,  John W. Kesterson ,  Xiaoyan Wang ,  Chenghung Pan

IPC: G05F1/00 ,  H05B37/02 ,  H05B39/04 ,  H05B41/36

CPC classification number: H05B33/0842 ,  H01L22/14 ,  H01L2924/0002 ,  H05B33/0818 ,  H05B33/0827 ,  Y02B20/341 ,  H01L2924/00

Abstract: An adaptive switch mode LED driver provides an intelligent approach to driving multiple strings of LEDs. The LED driver determines an optimal current level for each LED channel from a limited set of allowed currents. The LDO driver then determines a PWM duty cycle for driving the LEDs in each LED channel to provide precise brightness control over the LED channels. Beneficially, the LED driver minimizes the power dissipation in the LDO circuits driving each LED string, while also ensuring that the currents in each LED string are maintained within a limited range. A sample and hold LDO allows PWM control over extreme duty cycles with very fast dynamic response. Furthermore, fault protection circuitry ensures fault-free startup and operation of the LED driver.

Abstract translation: 自适应开关模式LED驱动器提供了一种智能方法来驱动多串LED。 LED驱动器从有限的一组允许电流确定每个LED通道的最佳电流电平。 然后，LDO驱动器确定用于驱动每个LED通道中的LED的PWM占空比，以在LED通道上提供精确的亮度控制。 有利的是，LED驱动器使驱动每个LED串的LDO电路的功耗最小化，同时还确保每个LED串中的电流保持在有限的范围内。 采样和保持LDO允许通过非常快的动态响应对极端占空比进行PWM控制。 此外，故障保护电路确保LED驱动器的无故障启动和操作。

公开(公告)号：US08199537B2

公开(公告)日：2012-06-12

申请号：US12388709

申请日：2009-02-19

Applicant: Liang Yan ,  Xiaoyan Wang ,  Jun Zheng ,  Junjie Zheng ,  Clarita Poon

Inventor： Liang Yan ,  Xiaoyan Wang ,  Jun Zheng ,  Junjie Zheng ,  Clarita Poon

IPC: H02M3/335

CPC classification number: H02M3/33523 ,  H02M2001/0032 ,  Y02B70/16

Abstract: A switching power converter detects low load conditions based on the ratio of a first peak current value for peak current switching in constant voltage regulation mode to a second peak current value for peak current switching in constant current regulation mode. The power supply load is considered to have a low load if the ratio is lower than a predetermined threshold. Once a low load condition is detected, the switching frequency of the switching power converter is reduced to a level that minimizes switching loss in the power converter. In addition, the switching power converter also adjusts the switching frequency according to the sensed input line voltage. An offset is added to the switching period to reduce the switching frequency of the switching power converter, as the input line voltage is increased.

Abstract translation: 开关电源转换器基于用于恒定电流调节模式下的峰值电流切换的恒定电压调节模式中的峰值电流切换的第一峰值电流值与用于恒定电流调节模式下的峰值电流切换的第二峰值电流值的比率来检测低负 如果该比率低于预定阈值，则电源负载被认为具有低负载。 一旦检测到低负载状态，则将开关功率转换器的开关频率降低到最小化功率转换器中的开关损耗的水平。 此外，开关功率转换器还根据感测的输入线电压来调节开关频率。 随着输入线电压的增加，偏置被加到开关周期以降低开关功率转换器的开关频率。

公开(公告)号：US20110286248A1

公开(公告)日：2011-11-24

申请号：US13198358

申请日：2011-08-04

Applicant: Xiaoyan Wang ,  Liang Yan ,  Junjie Zheng ,  John William Kesterson ,  Clarita Poon

Inventor： Xiaoyan Wang ,  Liang Yan ,  Junjie Zheng ,  John William Kesterson ,  Clarita Poon

IPC: H02M3/335

CPC classification number: H02M3/33507 ,  H02M2001/0032 ,  Y02B70/16

Abstract: In a switching power converter, PWM mode and PFM mode are separated into two independent control sections with the control voltage range in each control section determined independently. Each of the PWM and PFM modulation modes cannot operate continuously beyond its boundaries, thereby forming a control gap between the two control sections within which no continuous operation is allowed. In order to supply a load condition within the control gap, the power supply operates at the two boundaries of the control gap. Transition between PWM and PFM modes occurs fast, with low output voltage ripple. No limitation needs to be imposed on the control voltage range in each of the PWM and PFM control sections, because the control parameters in the PWM and PFM control sections need not be matched to one another, due to separation of the PWM and PFM modes by the control gap.

Abstract translation: 在开关电源转换器中，PWM模式和PFM模式分为两个独立控制部分，每个控制部分的控制电压范围独立确定。 每个PWM和PFM调制模式都不能连续超过其边界，从而在两个控制部分之间形成一个控制间隙，在这两个控制部分之间不允许连续的操作。 为了在控制间隙内提供负载条件，电源在控制间隙的两个边界处工作。 PWM和PFM模式之间的转换发生得很快，输出电压波动较小。 在PWM和PFM控制部分的每个PWM控制部分的控制电压范围不受限制，因为PWM和PFM控制部分中的控制参数不需要彼此匹配，这是由于PWM和PFM模式的分离 控制差距。

公开(公告)号：US20110062872A1

公开(公告)日：2011-03-17

申请号：US12558275

申请日：2009-09-11

Applicant: Xuecheng Jin ,  Yu Cheng Chang ,  Yang Li ,  Maofeng Lan ,  John W. Kesterson ,  Xiaoyan Wang ,  Chenghung Pan

Inventor： Xuecheng Jin ,  Yu Cheng Chang ,  Yang Li ,  Maofeng Lan ,  John W. Kesterson ,  Xiaoyan Wang ,  Chenghung Pan

IPC: H05B37/00 ,  H01L21/66

CPC classification number: H05B33/0842 ,  H01L22/14 ,  H01L2924/0002 ,  H05B33/0818 ,  H05B33/0827 ,  Y02B20/341 ,  H01L2924/00

Abstract: An adaptive switch mode LED driver provides an intelligent approach to driving multiple strings of LEDs. The LED driver determines an optimal current level for each LED channel from a limited set of allowed currents. The LDO driver then determines a PWM duty cycle for driving the LEDs in each LED channel to provide precise brightness control over the LED channels. Beneficially, the LED driver minimizes the power dissipation in the LDO circuits driving each LED string, while also ensuring that the currents in each LED string are maintained within a limited range. A sample and hold LDO allows PWM control over extreme duty cycles with very fast dynamic response. Furthermore, fault protection circuitry ensures fault-free startup and operation of the LED driver.

Abstract translation: 自适应开关模式LED驱动器提供了一种智能方法来驱动多串LED。 LED驱动器从有限的一组允许电流确定每个LED通道的最佳电流电平。 然后，LDO驱动器确定用于驱动每个LED通道中的LED的PWM占空比，以在LED通道上提供精确的亮度控制。 有利的是，LED驱动器使驱动每个LED串的LDO电路的功耗最小化，同时还确保每个LED串中的电流保持在有限的范围内。 采样和保持LDO允许通过非常快的动态响应对极端占空比进行PWM控制。 此外，故障保护电路确保LED驱动器的无故障启动和操作。

公开(公告)号：US07443700B2

公开(公告)日：2008-10-28

申请号：US11745299

申请日：2007-05-07

Applicant: Liang Yan ,  Junjie Zheng ,  John Kesterson ,  Xiaoyan Wang ,  Hien Bui

Inventor： Liang Yan ,  Junjie Zheng ,  John Kesterson ,  Xiaoyan Wang ,  Hien Bui

IPC: H02M3/335

CPC classification number: H02M3/33515 ,  H02M2001/0006

Abstract: A primary side sensing power control system and method for constant current control that utilizes a relationship that involves the measured reset-time from the previous cycle to determine the primary side peak current and off-time for the next cycle. This control mechanism does not need the knowledge of input voltage or magnetizing inductance. Therefore, it removes the sensitivities of input voltage and magnetizing inductance to the output current limit. Furthermore, it uses a time measurement instead of a voltage measurement for the current calculation which in many cases is easier to perform.

Abstract translation: 用于恒定电流控制的初级侧感测功率控制系统和方法，其利用涉及来自前一周期的测量复位时间的关系来确定下一个周期的初级侧峰值电流和关断时间。 该控制机构不需要输入电压或励磁电感的知识。 因此，它可以消除输入电压和励磁电感对输出电流极限的敏感度。 此外，它使用时间测量而不是当前计算的电压测量，这在许多情况下更容易执行。

公开(公告)号：US08796974B2

公开(公告)日：2014-08-05

申请号：US13567815

申请日：2012-08-06

Applicant: Xiaoyan Wang ,  Yateendra Deshpande

Inventor： Xiaoyan Wang ,  Yateendra Deshpande

IPC: H02P6/08 ,  H02K29/12

CPC classification number: H02K29/12 ,  H02P21/32 ,  H02P2207/05

Abstract: A system for determining an initial position of a rotor (9) of a PMSM motor includes a motor controller (2) coupled to a plurality of phase windings of the motor by means of an actuation circuit (3). A processor (12) and an interface circuit (14) are coupled to the processor and the phase windings. The processor determines if the rotor speed is zero, and if so causes the actuation circuit to sequentially apply voltage signals (Vab, Vba, Vac, Vca, Vbc, and Vcb) to the phase windings to produce corresponding phase winding current signals (Iab, Icb, Ica, Iba, Ibc, Iac) in the various phase windings. The phase winding current signals are sensed and digitized. The processor then determines a position of a magnetic flux path associated with the rotor by computing the initial position of the rotor from one of the digitized phase winding current signals associated with the predetermined magnetic flux path.

Abstract translation: 用于确定PMSM马达的转子（9）的初始位置的系统包括通过致动电路（3）耦合到马达的多个相绕组的马达控制器（2）。 处理器（12）和接口电路（14）耦合到处理器和相绕组。 处理器确定转子速度是否为零，如果是，则使致动电路依次向相绕组施加电压信号（Vab，Vba，Vac，Vca，Vbc和Vcb）以产生相应的相绕组电流信号（Iab， Icb，Ica，Iba，Ibc，Iac）。 相绕组电流信号被感测和数字化。 然后，处理器通过从与预定磁通路径相关联的数字化相位绕组电流信号之一计算转子的初始位置来确定与转子相关联的磁通路径的位置。

公开(公告)号：US20130127344A1

公开(公告)日：2013-05-23

申请号：US13675515

申请日：2012-11-13

Applicant: Xuecheng Jin ,  Yu Chong Chang ,  Yang Li ,  Maofeng Lan ,  John W. Kesterson ,  Xiaoyan Wang ,  Chenghung Pan

Inventor： Xuecheng Jin ,  Yu Chong Chang ,  Yang Li ,  Maofeng Lan ,  John W. Kesterson ,  Xiaoyan Wang ,  Chenghung Pan

IPC: H05B33/08

CPC classification number: H05B33/0842 ,  H01L22/14 ,  H01L2924/0002 ,  H05B33/0818 ,  H05B33/0827 ,  Y02B20/341 ,  H01L2924/00

Abstract: An adaptive switch mode LED driver provides an intelligent approach to driving multiple strings of LEDs. The LED driver determines an optimal current level for each LED channel from a limited set of allowed currents. The LDO driver then determines a PWM duty cycle for driving the LEDs in each LED channel to provide precise brightness control over the LED channels. Beneficially, the LED driver minimizes the power dissipation in the LDO circuits driving each LED string, while also ensuring that the currents in each LED string are maintained within a limited range. A sample and hold LDO allows PWM control over extreme duty cycles with very fast dynamic response. Furthermore, fault protection circuitry ensures fault-free startup and operation of the LED driver.

Abstract translation: 自适应开关模式LED驱动器提供了一种智能方法来驱动多串LED。 LED驱动器从有限的一组允许电流确定每个LED通道的最佳电流电平。 然后，LDO驱动器确定用于驱动每个LED通道中的LED的PWM占空比，以在LED通道上提供精确的亮度控制。 有利的是，LED驱动器使驱动每个LED串的LDO电路的功耗最小化，同时还确保每个LED串中的电流保持在有限的范围内。 采样和保持LDO允许通过非常快的动态响应对极端占空比进行PWM控制。 此外，故障保护电路确保LED驱动器的无故障启动和操作。

公开(公告)号：US20130015794A1

公开(公告)日：2013-01-17

申请号：US13182270

申请日：2011-07-13

Applicant: Xiaoyan Wang ,  Yateendra Deshpande

Inventor： Xiaoyan Wang ,  Yateendra Deshpande

IPC: H02P6/20

CPC classification number: H02P6/20 ,  H02P6/188

Abstract: A method for driving a brushless direct current (DC) motor is provided. The brushless DC motor has a first phase that is coupled between a first terminal and a common node, a second phase that is coupled between a second terminal and the common node, and a third phase that is coupled between a third terminal and the common node. The first and second phases are coupled to a first supply rail and a second supply rail, respectively, such that the brushless DC motor is in a first commutation state. The first phase is then decoupled from the first supply rail so as to allow first terminal to float during a window period. A first voltage difference between the first terminal and the second terminal is compared to a second voltage difference between the third terminal and the second terminal during the window period, and the brushless DC motor is commuted to a second commutation state if the first voltage difference is approximately equal to the second voltage difference.

Abstract translation: 提供一种用于驱动无刷直流（DC）电动机的方法。 无刷直流电动机具有耦合在第一端子和公共节点之间的第一相位，耦合在第二端子和公共节点之间的第二相位，以及耦合在第三端子和公共节点之间的第三相位 。 第一和第二相分别耦合到第一电源轨和第二电源轨，使得无刷直流电动机处于第一换向状态。 然后，第一阶段与第一供电轨道解耦，以便允许第一端子在窗口期间浮动。 第一端子和第二端子之间的第一电压差在窗口期间与第三端子和第二端子之间的第二电压差进行比较，并且如果第一电压差是第一电压差，则将无刷直流电动机换向第二换向状态 大致等于第二电压差。

公开(公告)号：US20120269234A1

公开(公告)日：2012-10-25

申请号：US13511993

申请日：2009-12-29

Applicant: Zaichen Zhang ,  Jian Dang ,  Xiaoyan Wang ,  Guangguo Bi ,  Xutao Yu

Inventor： Zaichen Zhang ,  Jian Dang ,  Xiaoyan Wang ,  Guangguo Bi ,  Xutao Yu

IPC: H04B1/707 ,  H04L27/01 ,  H04B1/7097 ,  H04B1/7093

CPC classification number: H04L5/0007 ,  H04L27/264 ,  H04L27/2653

Abstract: The present invention is a double-layer multi-carrier ultra-wideband wireless communication method, wherein the frequency band for ultra-wideband communication is divided into a plurality of sub-bands, then one or more sub-bands are used for data transmission, and the Orthogonal Frequency Division Multiplex (OFDM) multi-carrier transmission technology is used in each sub-band. In the transmitting party, the data symbols to be transmitted are allocated on M branches corresponding to the M sub-bands, and the OFDM modulation is implemented on the data symbols on each branch to obtain M branches of parallel data, then digital baseband multi-carrier modulation is implemented on the M branches of parallel data. Thereby, the spectrum of data on each branch is moved onto the digital sub-band corresponding to the radio sub-band one to one, so the digital baseband signal of the radio signal to be transmitted is obtained. Then, the digital signal is converted to an analog signal with a D/A conversion and an up-conversion, and the signal spectrum is moved to the radio frequency band in use, then the analog signal is amplified, filtered and transmitted via an antenna, thus the task of modulating M branches of parallel data onto M sub-bands is completed.

Abstract translation: 本发明是一种双层多载波超宽带无线通信方法，其中用于超宽带通信的频带被划分为多个子带，然后使用一个或多个子带进行数据传输， 并且在每个子带中使用正交频分复用（OFDM）多载波传输技术。 在发送方中，将要发送的数据符号分配在对应于M个子带的M个分支上，并且在每个分支上的数据符号上实施OFDM调制以获得并行数据的M个分支， 在并行数据的M个分支上实现载波调制。 由此，将各分支的数据频谱一一对应地移动到与无线子带对应的数字子带上，得到要发送的无线信号的数字基带信号。 然后，数字信号被转换成具有D / A转换和上变频的模拟信号，并且信号频谱被移动到使用中的无线电频带，然后模拟信号经由天线被放大，滤波和发送 因此完成将并行数据的M个分支调制到M个子带上的任务。

公开(公告)号：US08199539B2

公开(公告)日：2012-06-12

申请号：US13198358

申请日：2011-08-04

Applicant: Xiaoyan Wang ,  Liang Yan ,  Junjie Zheng ,  John William Kesterson ,  Clarita Poon

Inventor： Xiaoyan Wang ,  Liang Yan ,  Junjie Zheng ,  John William Kesterson ,  Clarita Poon

IPC: H02M3/335 ,  H02M3/157

CPC classification number: H02M3/33507 ,  H02M2001/0032 ,  Y02B70/16

Abstract: In a switching power converter, PWM mode and PFM mode are separated into two independent control sections with the control voltage range in each control section determined independently. Each of the PWM and PFM modulation modes cannot operate continuously beyond its boundaries, thereby forming a control gap between the two control sections within which no continuous operation is allowed. In order to supply a load condition within the control gap, the power supply operates at the two boundaries of the control gap. Transition between PWM and PFM modes occurs fast, with low output voltage ripple. No limitation needs to be imposed on the control voltage range in each of the PWM and PFM control sections, because the control parameters in the PWM and PFM control sections need not be matched to one another, due to separation of the PWM and PFM modes by the control gap.

Abstract translation: 在开关电源转换器中，PWM模式和PFM模式分为两个独立控制部分，每个控制部分的控制电压范围独立确定。 每个PWM和PFM调制模式都不能连续超过其边界，从而在两个控制部分之间形成一个控制间隙，在这两个控制部分之间不允许连续的操作。 为了在控制间隙内提供负载条件，电源在控制间隙的两个边界处工作。 PWM和PFM模式之间的转换发生得很快，输出电压波动较小。 在PWM和PFM控制部分的每个PWM控制部分的控制电压范围不受限制，因为PWM和PFM控制部分中的控制参数不需要彼此匹配，这是由于PWM和PFM模式的分离 控制差距。