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21. 发明授权

US07737673B2 Controlling a voltage regulator 有权
标题翻译：控制电压调节器
公开(公告)号：US07737673B2
公开(公告)日：2010-06-15
申请号：US11241334
申请日：2005-09-30
申请人： Xiaoyu Xi , Shyam S. Somayajula
发明人： Xiaoyu Xi , Shyam S. Somayajula
IPC分类号： G05F1/575 , G05F1/618
CPC分类号： H02M3/156
摘要： A technique includes energizing a storage element of a voltage regulator in response to the detection of an output voltage of the voltage regulator falling below a threshold level. The technique includes halting the energization of the storage element in response to the detection of a current in the storage element reaching a predetermined threshold.
摘要翻译：一种技术包括响应于电压调节器的输出电压的检测下降到阈值水平以下来激励电压调节器的存储元件。该技术包括响应于存储元件中的电流的检测达到预定阈值，停止存储元件的通电。

22. 发明授权

US07440249B2 Undervoltage detection circuit 失效
标题翻译：欠压检测电路
公开(公告)号：US07440249B2
公开(公告)日：2008-10-21
申请号：US11094610
申请日：2005-03-30
申请人： Wenjun Sheng , Xiaoyu Xi
发明人： Wenjun Sheng , Xiaoyu Xi
IPC分类号： H02H3/24
CPC分类号： G01R19/16552
摘要： An undervoltage detection circuit includes a first transistor and a second transistor coupled to a supply voltage node and arranged to form a current mirror. The undervoltage detection circuit also includes a first bipolar transistor and a second bipolar transistor. A collector of the first bipolar transistor is coupled to the first transistor, and an emitter of the first bipolar transistor is coupled to a reference voltage node. A collector of the second bipolar transistor is coupled to the second transistor and an emitter of the second bipolar transistor is coupled to the reference voltage node through a first resistor. The undervoltage detection circuit further includes a third transistor coupled through a second resistor to an input voltage node. An output signal indicative of an input voltage is derived from a voltage established at the collector of the second bipolar transistor.
摘要翻译：欠压检测电路包括耦合到电源电压节点并被布置成形成电流镜的第一晶体管和第二晶体管。欠压检测电路还包括第一双极晶体管和第二双极晶体管。第一双极晶体管的集电极耦合到第一晶体管，并且第一双极晶体管的发射极耦合到参考电压节点。第二双极晶体管的集电极耦合到第二晶体管，并且第二双极晶体管的发射极通过第一电阻耦合到参考电压节点。欠压检测电路还包括通过第二电阻器耦合到输入电压节点的第三晶体管。指示输入电压的输出信号是从在第二双极晶体管的集电极处建立的电压导出的。

23. 发明申请

US20070075693A1 Dynamic bias circuit for use with a stacked device arrangement 有权
标题翻译：用于堆叠设备布置的动态偏置电路
公开(公告)号：US20070075693A1
公开(公告)日：2007-04-05
申请号：US11241285
申请日：2005-09-30
申请人： Xiaoyu Xi
发明人： Xiaoyu Xi
IPC分类号： G05F1/00
CPC分类号： G05F3/205
摘要： A regulator circuit includes a first transistor coupled to a supply voltage and a second transistor coupled between the first transistor and an output node. The regulator circuit also includes a dynamic bias circuit that may selectively provide a bias voltage to a gate of the second transistor. During a first mode such as a low power mode, for example, the bias circuit may provide the bias voltage at a fixed percentage of the supply voltage as the supply voltage varies. In addition, during a second mode such as a high power mode, for example, the bias circuit may provide the bias voltage at a fixed offset from the supply voltage as the supply voltage varies.
摘要翻译：调节器电路包括耦合到电源电压的第一晶体管和耦合在第一晶体管和输出节点之间的第二晶体管。调节器电路还包括可以选择性地向第二晶体管的栅极提供偏置电压的动态偏置电路。在诸如低功率模式的第一模式期间，例如，当电源电压变化时，偏置电路可以以电源电压的固定百分比提供偏置电压。此外，在诸如高功率模式的第二模式期间，例如，当电源电压变化时，偏置电路可以将偏置电压提供在与电源电压固定的偏移处。

24. 发明授权

US07151361B2 Current sensing circuitry for DC-DC converters 有权
标题翻译：用于DC-DC转换器的电流检测电路
公开(公告)号：US07151361B2
公开(公告)日：2006-12-19
申请号：US10984283
申请日：2004-11-09
申请人： Xiaoyu Xi
发明人： Xiaoyu Xi
IPC分类号： G05F1/10 , G05F1/40
CPC分类号： H02M3/156 , H02M2001/0009
摘要： An inductor based DC-DC converter of the present invention employs two power switches such that only a fraction of inductor current flows through sensing circuitry. The sensing circuitry itself is comprised of sense transistors instead of resistors in order to further reduce power dissipation and temperature variations. The sensing circuitry includes a differential power supply that modifies a sense current employed as feedback to one of its inputs. The sense transistors are selected and configured such that the sense current is a relatively constant fraction of the inductor current of the converter.
摘要翻译：本发明的基于电感器的DC-DC转换器采用两个功率开关，使得只有一部分电感电流流过检测电路。感测电路本身由感测晶体管代替电阻器，以进一步降低功耗和温度变化。感测电路包括差分电源，其将用作其输入之一的反馈的感测电流修改。感测晶体管被选择和配置为使得感测电流是转换器的电感器电流的相对恒定的分数。

25. 发明授权

US06995587B2 Low voltage low power bandgap circuit 有权
标题翻译：低压低功率带隙电路
公开(公告)号：US06995587B2
公开(公告)日：2006-02-07
申请号：US10951019
申请日：2004-09-27
申请人： Xiaoyu Xi
发明人： Xiaoyu Xi
IPC分类号： H03K5/22 , H03K5/153
CPC分类号： G05F3/30
摘要： Disclosed are methods and circuits for providing a bandgap reference in an electronic circuit having a supply voltage and ground. The methods include steps for generating a bandgap reference current, mirroring the bandgap reference current, summing the mirrored currents, and modulating and outputting a bandgap reference voltage from the sum. Representative preferred embodiments are disclosed in which the methods of the invention are used in providing under-voltage protection and in providing a regulated output voltage. Circuits are disclosed for a bandgap reference voltage generator useful for providing a bandgap reference voltage in a circuit. A first current mirror for provides current from a supply voltage. A bandgap reference current circuit between the first current mirror and ground is configured for deriving a bandgap current proportional to absolute temperature. A second current mirror and control circuit are provided for summing the mirrored currents and modulating a bandgap reference voltage output. Preferred embodiments of the invention include a bandgap under-voltage detection circuit using a comparator and a voltage regulator circuit having a regulated voltage output capability.
摘要翻译：公开了用于在具有电源电压和接地的电子电路中提供带隙基准的方法和电路。该方法包括用于产生带隙参考电流，镜像带隙参考电流，对镜像电流求和，以及从和的调制和输出带隙基准电压的步骤。公开了代表性的优选实施例，其中本发明的方法用于提供欠压保护和提供稳定的输出电压。公开了一种用于在电路中提供带隙参考电压的带隙参考电压发生器的电路。用于从电源电压提供电流的第一电流镜。第一电流镜和地之间的带隙参考电流电路被配置为导出与绝对温度成正比的带隙电流。提供第二电流镜和控制电路用于对镜像电流求和并调制带隙基准电压输出。本发明的优选实施例包括使用比较器的带隙欠压检测电路和具有调节电压输出能力的电压调节器电路。

26. 发明授权

US06970339B2 Current limit protection scheme for PWM buck converter with synchronous rectifier 有权
标题翻译：带同步整流器的PWM降压转换器的限流保护方案
公开(公告)号：US06970339B2
公开(公告)日：2005-11-29
申请号：US10833683
申请日：2004-04-27
申请人： Kae Wong , Xiaoyu Xi
发明人： Kae Wong , Xiaoyu Xi
IPC分类号： H02H3/08 , H02H9/02 , H02M1/00 , H02M3/158
CPC分类号： H02M3/1588 , H02M1/32 , H02M2001/0009 , Y02B70/1466
摘要： A embedded overcurrent protection circuit within the PWM feedback controller (30) of a power converter (100) having an novel current limit detection function that minimizes the effects of the turn-on period of the power device (14) is disclosed herein. This power converter includes a current limit detection circuit (10–20) that is reset on the rising edge of the system clock in a first step. In a second step, the power device (14) that is turned on. In another step, a current detecting circuit (10–20) detects the drain-to-source voltage across the power device (14) and the output current generated thereby. A sense circuit (18) compares the output current detected with a first predetermined limit value in another step. When the output current is less than the first predetermined limit value, a step is conducted where the output current is regulated by modulating the pulse width of the signal sent by a driver (12) to the control node of the power device (14). In the alternative, when the output current exceeds the first predetermined limit value, the power device (14) is turned off and the synchronous rectifier (16) is turned on while its current is monitored at a second predetermined limit value in another step. This synchronous rectifier (16) monitoring step enables the current limit detection circuit (10–20) to minimize the effects of the turn-on period of the power device (14). Finally, the current limit detection circuit (10–20) is reset on the rising edge of the system clock and wherein this entire procedure is continuous.
摘要翻译：这里公开了功率转换器（100）的PWM反馈控制器（30）内的嵌入式过电流保护电路，其具有使功率器件（14）的导通周期的影响最小化的新型限流检测功能。该电力转换器包括在第一步骤中在系统时钟的上升沿复位的限流检测电路（10-20）。在第二步骤中，打开电源装置（14）。在另一步骤中，电流检测电路（10-20）检测功率器件（14）两端的漏极 - 源极电压和由此产生的输出电流。感测电路（18）将检测到的输出电流与另一步骤中的第一预定极限值进行比较。当输出电流小于第一预定极限值时，进行通过调制由驱动器（12）发送到电力设备（14）的控制节点的信号的脉冲宽度来调节输出电流的步骤。另一方面，当输出电流超过第一预定极限值时，功率器件（14）关闭，并且同步整流器（16）导通，同时在另一步骤中以第二预定极限值监视其电流。该同步整流器（16）监视步骤使电流限制检测电路（10-20）能够最小化功率器件（14）的接通周期的影响。最后，电流限制检测电路（10-20）在系统时钟的上升沿被复位，其中整个过程是连续的。

27. 发明授权

US06806690B2 Ultra-low quiescent current low dropout (LDO) voltage regulator with dynamic bias and bandwidth 有权
标题翻译：具有动态偏置和带宽的超低静态电流低压差（LDO）稳压器
公开(公告)号：US06806690B2
公开(公告)日：2004-10-19
申请号：US10395967
申请日：2003-03-25
申请人： Xiaoyu Xi
发明人： Xiaoyu Xi
IPC分类号： G05F140
CPC分类号： G05F1/575
摘要： An LDO regulator automatically switches from the SLEEP mode to the ON mode without the need for an externally generated control signal. The LDO regulator utilizes a pair of drive amplifiers to drive a SLEEP mode pass transistor and a normal ON mode pass transistor, respectively. The regulator also has a circuit for adjusting the bias applied to the amplifiers for each mode of operation.
摘要翻译： LDO调节器自动从休眠模式切换到ON模式，无需外部产生的控制信号。 LDO稳压器利用一对驱动放大器分别驱动SLEEP模式传输晶体管和正常的ON模式传输晶体管。调节器还具有用于调整每个操作模式对放大器施加的偏置的电路。

28. 发明授权

US08891258B2 Switch mode power supply and control method thereof 有权
标题翻译：开关电源及其控制方法
公开(公告)号：US08891258B2
公开(公告)日：2014-11-18
申请号：US13468706
申请日：2012-05-10
申请人： Yongliang Zhang , Xiaoyu Xi , Jiali Cai
发明人： Yongliang Zhang , Xiaoyu Xi , Jiali Cai
IPC分类号： H02M3/335 , H05B33/08
CPC分类号： H02M3/33507 , H05B33/0815 , Y02B20/341
摘要： In one embodiment, a switch mode power supply comprising a switch and a control circuit is disclosed. The control circuit may comprise a multi-function pin configured to receive a first current sampling signal and a first voltage sampling signal. A first comparing signal may be provided by comparing the first voltage sampling signal with a first threshold signal when the switch is turned OFF, and a second comparing signal may be provided by comparing the first current sampling signal with a second threshold signal when the switch is turned ON. The control circuit may be configured to control the switch in accordance with the first comparing signal and the second comparing signal.
摘要翻译：在一个实施例中，公开了一种包括开关和控制电路的开关模式电源。控制电路可以包括被配置为接收第一电流采样信号和第一电压采样信号的多功能引脚。可以通过在开关断开时将第一电压采样信号与第一阈值信号进行比较来提供第一比较信号，并且可以通过将第一电流采样信号与第二阈值信号进行比较来提供第二比较信号，当开关为打开。控制电路可以被配置为根据第一比较信号和第二比较信号来控制开关。

29. 发明授权

US08880969B2 Switching converter with pulse skipping mode and control method thereof 有权
标题翻译：具有脉冲跳跃模式的开关转换器及其控制方法
公开(公告)号：US08880969B2
公开(公告)日：2014-11-04
申请号：US13413906
申请日：2012-03-07
申请人： Xiaoyu Xi
发明人： Xiaoyu Xi
IPC分类号： G06F11/07 , G06F11/36
CPC分类号： H02M3/156 , H02M2001/0035 , Y02B70/16
摘要： The present invention provides a switching converter with pulse skipping mode. The switching converter comprises a switching circuit having at least one switch, a controller and a feedback circuit. The controller comprises an error amplifying circuit, a logic circuit, a ramp signal generator and a pulse skipping circuit. The error amplifying circuit generates a compensation signal based on comparing the feedback signal with a reference signal. The logic circuit generates a control signal to control the ON and OFF switching of the at least one switch based on the compensation signal. The ramp signal generator generates a ramp signal. The pulse skipping circuit generates a pulse skipping signal based on the compensation signal, the ramp signal and a threshold voltage. The logic circuit skips one or more switching pulses of the control signal in accordance with the pulse skipping signal.
摘要翻译：本发明提供一种具有脉冲跳跃模式的开关转换器。开关转换器包括具有至少一个开关，控制器和反馈电路的开关电路。控制器包括误差放大电路，逻辑电路，斜坡信号发生器和脉冲跳跃电路。误差放大电路基于将反馈信号与参考信号进行比较来产生补偿信号。逻辑电路产生控制信号，以根据补偿信号控制至少一个开关的ON和OFF切换。斜坡信号发生器产生斜坡信号。脉冲跳跃电路基于补偿信号，斜坡信号和阈值电压产生脉冲跳跃信号。逻辑电路根据脉冲跳跃信号跳过控制信号的一个或多个开关脉冲。

30. 发明授权

US08803719B2 Sample and hold circuit with toggle control and method thereof 有权
标题翻译：采样和保持电路与切换控制及其方法
公开(公告)号：US08803719B2
公开(公告)日：2014-08-12
申请号：US13538940
申请日：2012-06-29
申请人： Yike Li , Xiaoyu Xi , Fei Wang , Zhengxing Li
发明人： Yike Li , Xiaoyu Xi , Fei Wang , Zhengxing Li
IPC分类号： H03M1/66
CPC分类号： H03K5/1532
摘要： A sample and hold circuit and the method thereof are disclosed. The sample and hold circuit may be applied in voltage regulators or other circuits. The sample and hold circuit comprises: an input terminal configured to receive an input signal; an output terminal configured to provide an output signal; a control circuit configured to receive the input signal and the output signal, and wherein based on the input signal and the output signal, the control circuit generates a digital signal, and wherein the digital signal increases when the output signal is lower than the input signal, and maintains when the output signal is larger than or equal to the input signal; a digital-to-analog converter (DAC) configured to convert the digital signal to the output signal.
摘要翻译：公开了采样保持电路及其方法。采样保持电路可以应用在电压调节器或其他电路中。采样和保持电路包括：输入端，被配置为接收输入信号; 输出端子，被配置为提供输出信号; 控制电路，被配置为接收所述输入信号和所述输出信号，并且其中基于所述输入信号和所述输出信号，所述控制电路产生数字信号，并且其中当所述输出信号低于所述输入信号时，所述数字信号增加并且当输出信号大于或等于输入信号时保持; 配置为将数字信号转换为输出信号的数模转换器（DAC）。

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