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1. 发明申请

US20130009617A1 CONTROL CIRCUITS FOR SWITCHING POWER CONVERTERS AND ASSOCIATED METHODS 有权
标题翻译：用于切换电源转换器和相关方法的控制电路
公开(公告)号：US20130009617A1
公开(公告)日：2013-01-10
申请号：US13542509
申请日：2012-07-05
申请人： Xiaoyu Xi , Paul Ueunten
发明人： Xiaoyu Xi , Paul Ueunten
IPC分类号： G05F1/10
CPC分类号： H02M3/156
摘要： The present application discloses a control circuit of a switching power converter, wherein the switching power converter comprises a power switch, and is configured to convert an input voltage into an output voltage, the control circuit comprises: a first time generating circuit configured to generate a first time signal; a phase lock circuit configured to generate a second time signal; and a switching signal generating circuit configured to generate a switching signal to control the ON and OFF switching of the power switch. The phase lock circuit generates the second time signal in accordance with the frequency difference between the switching signal and a reference clock signal, so as to get the frequency of the switching signal to be substantially equal to the frequency of the reference clock signal.
摘要翻译：本申请公开了一种开关电源转换器的控制电路，其中开关电源转换器包括电源开关，并且被配置为将输入电压转换为输出电压，该控制电路包括：第一时间生成电路，第一时间信号; 配置为产生第二时间信号的锁相电路; 以及切换信号发生电路，被配置为产生开关信号以控制电源开关的接通和断开。锁相电路根据切换信号和基准时钟信号之间的频率差产生第二时间信号，以使切换信号的频率基本上等于参考时钟信号的频率。

2. 发明授权

US08138734B2 Accurate current limit for peak current mode DC-DC converter 有权
标题翻译：峰值电流模式DC-DC转换器的精确电流限制
公开(公告)号：US08138734B2
公开(公告)日：2012-03-20
申请号：US12419217
申请日：2009-04-06
申请人： Xiaoyu Xi , Jian Zhou
发明人： Xiaoyu Xi , Jian Zhou
IPC分类号： G05F1/00
CPC分类号： H02M3/156
摘要： A DC-DC converter includes a switching stage and a control circuit coupled to provide an accurate current limit for peak current mode for the DC-DC converter. The control circuit is operative to provide a peak value of the peak current mode.
摘要翻译： DC-DC转换器包括开关级和控制电路，其耦合以为DC-DC转换器的峰值电流模式提供精确的电流限制。该控制电路用于提供峰值电流模式的峰值。

3. 发明授权

US07652457B2 Switching regulator circuit including an inductor shunt switch 有权
标题翻译：开关稳压电路包括电感分流开关
公开(公告)号：US07652457B2
公开(公告)日：2010-01-26
申请号：US11241286
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： H02M3/158
摘要： A switching regulator circuit includes a switching circuit that may be configured to alternately apply a supply voltage and a reference voltage to an inductor coupled between a first node and an output node. The switching regulator circuit also includes a switch such as a transistor, for example, that is coupled across the inductor. The switch may shunt the inductor when the current in the inductor reaches a predetermined current level.
摘要翻译：开关调节器电路包括可以被配置为交替地将电源电压和参考电压施加到耦合在第一节点和输出节点之间的电感器的开关电路。开关调节器电路还包括诸如晶体管的开关，例如被耦合在电感器两端的开关。当电感器中的电流达到预定电流水平时，开关可能会分流电感。

4. 发明申请

US20090195233A1 MANAGEMENT OF REGULATOR-INDUCED SWITCHING NOISE FOR SAMPLED SYSTEMS 有权
标题翻译：调节器感应开关噪声对采样系统的管理
公开(公告)号：US20090195233A1
公开(公告)日：2009-08-06
申请号：US12420684
申请日：2009-04-08
申请人： Xiaoyu Xi , Shyam S. Somayajula
发明人： Xiaoyu Xi , Shyam S. Somayajula
IPC分类号： G05F1/46
CPC分类号： H02M1/44 , G06F1/26
摘要： A system includes a sampler to sample an input voltage and a switching regulator. The switching regulator is adapted to regulate a switching operation of the regulator in response to the sampling by the sampler.
摘要翻译：系统包括用于对输入电压进行采样的采样器和开关调节器。开关调节器适于响应于采样器的采样来调节调节器的开关操作。

5. 发明申请

US20070075775A1 Amplifier 审中-公开
标题翻译：放大器
公开(公告)号：US20070075775A1
公开(公告)日：2007-04-05
申请号：US11240691
申请日：2005-09-30
申请人： Xiaoyu Xi
发明人： Xiaoyu Xi
IPC分类号： H03F3/45
CPC分类号： H03F3/45237
摘要： An amplifier includes a first amplifier stage, a second amplifier stage and an output stage. The output stage is driven in response to a first signal and a second signal to provide an output signal. The first amplifier stage provides the first signal in response to an indication of the second signal and a first component of a differential input signal. The second amplifier stage provides the second signal in response to an indication of the first signal and a second component of the differential input signal.
摘要翻译：放大器包括第一放大器级，第二放大级和输出级。响应于第一信号和第二信号来驱动输出级以提供输出信号。第一放大器级响应于第二信号的指示和差分输入信号的第一分量提供第一信号。响应于第一信号的指示和差分输入信号的第二分量，第二放大器级提供第二信号。

6. 发明申请

US20070075694A1 Controlling a voltage regulator 有权
标题翻译：控制电压调节器
公开(公告)号：US20070075694A1
公开(公告)日：2007-04-05
申请号：US11241334
申请日：2005-09-30
申请人： Xiaoyu Xi , Shyam Somayajula
发明人： Xiaoyu Xi , Shyam Somayajula
IPC分类号： G05F1/00
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。

7. 发明申请

US20050035813A1 Low voltage low power bandgap circuit 有权
公开(公告)号：US20050035813A1
公开(公告)日：2005-02-17
申请号：US10951019
申请日：2004-09-27
申请人： Xiaoyu Xi
发明人： Xiaoyu Xi
IPC分类号： G05F3/30 , G05F3/16
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.

8. 发明授权

US06465994B1 Low dropout voltage regulator with variable bandwidth based on load current 有权
标题翻译：基于负载电流的具有可变带宽的低压差稳压器
公开(公告)号：US06465994B1
公开(公告)日：2002-10-15
申请号：US10107922
申请日：2002-03-27
申请人： Xiaoyu Xi
发明人： Xiaoyu Xi
IPC分类号： G05F140
CPC分类号： G05F1/575
摘要： A low dropout voltage regulator includes: a first amplifier A1 having a reference voltage node VREF coupled to a first input; a second amplifier A2 having an input coupled to an output of the first amplifier A1; a variable bias current source I1 coupled to the first amplifier A1 and having a control node coupled to an output of the second amplifier A2; a power switch M1 having a control node coupled to the output of the second amplifier A2 and having a first end coupled to a source voltage node VDD; and a feedback circuit R1 and R2 having an input coupled to a second end of the power switch M1 and an output coupled to a second input of the first amplifier A1. The best node in the system that detects the load current level is the output of the second amplifier A2. This signal is used to modulate the bias current I1 of the first amplifier A1 by increasing the bias current when the load current increases and vice versa, which consequently modulates the transconductance of amplifier A1. This provides a higher bandwidth LDO with better transient performance and higher power supply rejection ratio.
摘要翻译：低压差稳压器包括：具有耦合到第一输入的参考电压节点VREF的第一放大器A1; 具有耦合到第一放大器A1的输出的输入的第二放大器A2; 耦合到第一放大器A1并且具有耦合到第二放大器A2的输出的控制节点的可变偏置电流源I1; 功率开关M1，其具有耦合到第二放大器A2的输出的控制节点，并且具有耦合到源电压节点VDD的第一端; 以及反馈电路R1和R2，其具有耦合到功率开关M1的第二端的输入和耦合到第一放大器A1的第二输入的输出。系统中检测负载电流电平的最佳节点是第二放大器A2的输出。该信号用于通过在负载电流增加时增加偏置电流来调制第一放大器A1的偏置电流I1，反之亦然，从而调制放大器A1的跨导。这提供了更高带宽的LDO，具有更好的瞬态性能和更高的电源抑制比。

9. 发明授权

US06300831B1 Compensating a Gm-boosted folded-cascode amplifier 有权
标题翻译：补偿Gm升压折叠共源共栅放大器
公开(公告)号：US06300831B1
公开(公告)日：2001-10-09
申请号：US09468505
申请日：1999-12-21
申请人： Xiaoyu Xi
发明人： Xiaoyu Xi
IPC分类号： H03F345
CPC分类号： H03F3/45291 , H03F3/45192 , H03F2203/45296 , H03F2203/45304 , H03F2203/45398 , H03F2203/45676
摘要： A folded-cascode amplifier (30) having a small signal gm being boosted and transferred from the input stage to the output stage to reduce current consumption and expand bandwidth. The amplifier has a pair of second amplifiers (A) operating as boosting amplifiers that provide a pole at its output node, which is at a fairly low frequency. A compensation scheme is employed to introduce a zero to cancel out this pole, and as a side benefit, another zero is brought in which is used to cancel out a second pole of the original folded-cascode amplifier so that bandwidth is actually expanded. Two compensation capacitors (C1, C2) serve two purposes, one, providing a dominant pole to the main amplifier due to a Miller Effect, where the value of the two capacitors are much smaller than for conventional folded-cascode amplifiers, and two, introduce two zeros which cancel out two high frequency poles so that bandwidth is expanded.
摘要翻译：具有小信号gm的折叠共源共栅放大器（30）被升压并从输入级传送到输出级，以减少电流消耗并扩大带宽。该放大器具有一对作为升压放大器工作的第二放大器（A），该放大器在其输出节点处提供极点，该极点处于相当低的频率。采用补偿方案来引入零以消除该极点，并且作为副作用，引入另一个零，以消除原始折叠共源共栅放大器的第二极点，从而实际上扩展了带宽。两个补偿电容器（C1，C2）用于两个目的，一个是由于米勒效应为主放大器提供了一个主极，其中两个电容器的值比传统的折叠共源共栅放大器要小得多，而两个补偿电容器两个零可以消除两个高频极点，从而扩展带宽。

10. 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。

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