公开(公告)号：US20120039103A1

公开(公告)日：2012-02-16

申请号：US13207435

申请日：2011-08-11

申请人： Ming Xu ,  Julu Sun ,  Chao Sun

发明人： Ming Xu ,  Julu Sun ,  Chao Sun

IPC分类号： H02M7/06

CPC分类号： H02M1/425 ,  H02M1/4258 ,  Y02B70/126

摘要： A single-stage AC/DC converter is provided, and which includes a power-frequency follow-current circuit, an isolated transmission circuit (ITC), a high-frequency chopper modulation circuit (HFCMC), a power-frequency and high-frequency AC rectifying-circuit and a filter-circuit. The input of the ITC is connected to the output of an external power-frequency power source, the current-modulating side of the ITC is connected to the input of the HFCMC, the output of the ITC is connected to the input of the power-frequency and high-frequency AC rectifying-circuit, the output of the HFCMC is connected to the input of the external power-frequency power source through the power-frequency follow-current connected in series with the HFCMC , and the output of the power-frequency and high-frequency AC rectifying circuit is connected to a load through the filter circuit connected in series with the power-frequency and high-frequency AC rectifying-circuit. The invention simplifies the rectifier part with higher transformation efficiency.

摘要翻译： 提供了一个单级AC / DC转换器，它包括一个功率频率跟随电路，一个隔离传输电路（ITC），一个高频斩波调制电路（HFCMC），一个工频和高频 交流整流电路和滤波电路。 ITC的输入连接到外部电源电源的输出，ITC的电流调制侧连接到HFCMC的输入，ITC的输出端连接到电源 - 频率和高频交流整流电路，HFCMC的输出通过与HFCMC串联连接的工频跟随电流连接到外部电源电源的输入端， 频率和高频交流整流电路通过与电源频率和高频交流整流电路串联连接的滤波电路连接到负载。 本发明简化了转换效率较高的整流器部件。

公开(公告)号：US08587965B2

公开(公告)日：2013-11-19

申请号：US13208348

申请日：2011-08-12

申请人： Ming Xu ,  Julu Sun

发明人： Ming Xu ,  Julu Sun

IPC分类号： H02M3/335

CPC分类号： H02M3/3376 ,  H02M2001/0058 ,  Y02B70/1433 ,  Y02B70/1491

摘要： A current-input-type parallel resonant DC/DC converter and a method thereof are provided. The converter includes an inverter-circuit for inverting/converting an input DC current into a positive-and-negative alternating square-wave-current, a resonant-network for converting the square-wave-current into a sine-voltage, a transformer for realizing the isolation of the power transmission, a full-wave rectifier-circuit for rectifying the sine-voltage, and an output-filter-circuit for producing a DC output-voltage. The inverter-circuit is connected to both terminals of a primary-winding of the transformer through the resonant-network connected in series with the inverter-circuit, a common-polarity terminal of a first-winding at a secondary side of the transformer and an opposite-polarity terminal of a second-winding at the secondary side of the transformer are respectively connected to an input of the full-wave rectifier-circuit, and an output of the full-wave rectifier-circuit and a center-tap terminal at the secondary side of the transformer are respectively connected to an input of the output-filter-circuit.

摘要翻译： 提供电流输入型并联谐振DC / DC转换器及其方法。 该转换器包括用于将输入DC电流反相/转换为正负交替方波电流的逆变器电路，用于将方波电流转换为正弦电压的谐振网络，用于 实现电力传输的隔离，用于整流正弦电压的全波整流电路，以及用于产生直流输出电压的输出滤波电路。 逆变器电路通过与逆变器电路串联连接的谐振网络连接到变压器的初级绕组的两端，变压器次级侧的第一绕组的共极端子和 在变压器次级侧的第二绕组的极性极性端子分别连接到全波整流电路的输入端，全波整流电路的输出和中心抽头端子的输出端 变压器的次级侧分别连接到输出滤波电路的输入端。

公开(公告)号：US20060226819A1

公开(公告)日：2006-10-12

申请号：US11094438

申请日：2005-03-31

申请人： Ming Xu ,  Julu Sun ,  Jinghai Zhou ,  Fred Lee

发明人： Ming Xu ,  Julu Sun ,  Jinghai Zhou ,  Fred Lee

IPC分类号： G05F1/00

CPC分类号： H02M3/1582 ,  H02M3/338

摘要： A voltage converter uses a component such as a JFET or four-terminal power MOSFET having no body diode and exhibiting no body diode conduction characteristic as a synchronous rectifier to reduce switching losses and body diode conduction losses and to support high frequency switching so that use of smaller components and higher current densities can be achieved. These effects are enhanced by a self-driven circuit utilizing positive feedback to enhance switching speed and reduce switching losses which increase with switching frequency.

摘要翻译： 电压转换器使用诸如JFET或不具有体二极管导通特性的JFET或四端子功率MOSFET的组件作为同步整流器来减少开关损耗和体二极管导通损耗并支持高频开关，从而使用 可以实现更小的组件和更高的电流密度。 这些效应通过利用正反馈的自驱动电路增强，以提高开关速度并减少开关频率增加的开关损耗。

公开(公告)号：US08331110B2

公开(公告)日：2012-12-11

申请号：US12638261

申请日：2009-12-15

申请人： Ming Xu ,  Ke Jin ,  Fred C. Lee

发明人： Ming Xu ,  Ke Jin ,  Fred C. Lee

IPC分类号： H02M3/335 ,  G05F3/04

CPC分类号： H02M3/158 ,  H02M3/073 ,  H02M3/1584

摘要： A power converter topology operates as a switching capacitor (capacitive voltage divider) converter during a first, preferably short portion of a switching cycle to provide excellent dynamic transient response and as a pulse width modulated converter during a second portion of a switching cycle to provide flexibility of voltage regulation and generality of application. This topology can be made self-driven and is capable of zero voltage switching. Therefore the power converter can be used as one of a plurality of branches of a multi-phase converter to enhance transient response. The respective branches can also be independently optimized for particular load levels and can be operated independently in a phase shedding manner to improve efficiency at low load. Further, the power converter or respective branches of a multi-phase power converter are compatible with non-linear control to further improve dynamic response.

摘要翻译： 电源转换器拓扑在切换周期的第一，最好是短的部分期间用作开关电容器（电容分压器）转换器，以在开关周期的第二部分期间提供优异的动态瞬态响应和作为脉宽调制的转换器，以提供灵活性 的电压调节和一般性的应用。 该拓扑结构可以是自驱动的，并且能够进行零电压切换。 因此，功率转换器可以用作多相转换器的多个分支之一，以增强瞬态响应。 相应的分支也可以针对特定的负载水平独立地进行优化，并且可以以相位切换方式独立地进行操作，以在低负载下提高效率。 此外，功率转换器或多相功率转换器的各个分支与非线性控制兼容以进一步改善动态响应。

公开(公告)号：US20120014148A1

公开(公告)日：2012-01-19

申请号：US13184788

申请日：2011-07-18

申请人： Qian Li ,  Fred C. Lee ,  Ming Xu ,  Chuanyun Wang

发明人： Qian Li ,  Fred C. Lee ,  Ming Xu ,  Chuanyun Wang

IPC分类号： H02M1/00

CPC分类号： H02M1/4216 ,  H02M1/4225 ,  H02M1/44 ,  H02M2001/0032 ,  H02M2003/1586 ,  Y02B70/126 ,  Y02B70/16 ,  Y02P80/112

摘要： Light load efficiency of a power factor correction circuit is improved by adaptive on-time control and providing for selection between a continuous conduction mode and a discontinuous conduction mode wherein the discontinuous conduction mode increases time between switching pulses controlling connection of a cyclically varying voltage to a filter/inductor that delivers a desired DC voltage and thus can greatly reduce the switching frequency at light loads where switching frequency related losses dominate efficiency. The mode for controlling switching is preferably selected for each switching pulse within a half cycle of the cyclically varying input voltage. A multi-phase embodiment allows cancellation of EMI noise at harmonics of the switching frequency and adaptive change of phase angle allows for cancellation of dominant higher order harmonics as switching frequency is reduced.

摘要翻译： 通过自适应导通时间控制来提高功率因数校正电路的轻负载效率，并提供连续导通模式和不连续导通模式之间的选择，其中不连续导通模式增加了控制周期性变化的电压连接到开关脉冲之间的时间 滤波器/电感器提供所需的直流电压，因此可以大大降低开关频率相关损耗占优势的轻负载时的开关频率。 优选地，在循环变化的输入电压的半周期内针对每个开关脉冲选择用于控制切换的模式。 多相实施例允许在开关频率的谐波处消除EMI噪声，并且由于开关频率降低，相位角的自适应变化允许抵消主要高阶谐波。

公开(公告)号：US07821375B2

公开(公告)日：2010-10-26

申请号：US11668229

申请日：2007-01-29

申请人： Yan Dong ,  Ming Xu ,  Fred C. Lee

发明人： Yan Dong ,  Ming Xu ,  Fred C. Lee

IPC分类号： H01F27/28 ,  H01F5/00

CPC分类号： H02M3/1584 ,  H01F17/0006 ,  H01F27/255 ,  H01F37/00

摘要： A multiple phase buck converter or boost converter, or buck-boost converter has an inductor in each phase. The inductors are inversely coupled. In a first embodiment, the converter includes a toroidal magnetic core with inductors extending under and over opposite sides of the toroidal magnetic core. The coupled inductors are thereby inversely coupled and have a relatively low ohmic resistance. In a second embodiment, the converter comprises a ladder-shaped magnetic core (i.e. having parallel sides, and connecting rungs). In this case, the inductors extend under the sides, and over the rungs. Each inductor is disposed over a separate rung. The ladder-shaped magnetic core is preferably disposed flat on a circuit board. Inverse coupling and low ohmic resistance are also provided in the second embodiment having the ladder structure.

公开(公告)号：US07583065B2

公开(公告)日：2009-09-01

申请号：US12401815

申请日：2009-03-11

申请人： Ming Xu ,  Yuancheng Ren ,  Fred C. Lee ,  Andrew P. Schmit

发明人： Ming Xu ,  Yuancheng Ren ,  Fred C. Lee ,  Andrew P. Schmit

IPC分类号： G05F1/614 ,  G05F1/563

CPC分类号： H02M3/158 ,  H02M2001/0045

摘要： An active linear regulator circuit in parallel with a filter capacitor of a switching voltage regulator injects current to a load only when the switching regulator and capacitor cannot supply adequate current to follow high frequency load transients in a manner which is compatible with adaptive voltage positioning (AVP) requirements. control of current injection and determination of the insufficiency of current from the switching regulator and capacitors is achieved by impedance matching of the linear regulator to the switching regulator. The linear regulator thus operates at relatively low current and duty cycle to limit power dissipation therein. By matching impedances and increasing the bandwidth of the switching regulator, filter capacitor requirements can be reduced to the point of being met entirely by packaging and/or on-die capacitors which may be placed close to or at the point of load to reduce parasitic inductance, as can the linear regulator.

公开(公告)号：US20080239771A1

公开(公告)日：2008-10-02

申请号：US11834281

申请日：2007-08-06

申请人： Chuanyun Wang ,  Ming Xu ,  Fred C. Lee

发明人： Chuanyun Wang ,  Ming Xu ,  Fred C. Lee

IPC分类号： H02M1/12

CPC分类号： H02M1/12 ,  H02M1/42 ,  H02M3/1584 ,  H02M2003/1586 ,  Y02B70/12

摘要： In a power converter having m=two or more channels of power factor correction (PFC) circuits connected in parallel and an electromagnetic interference (EMI) filter connected in series therewith, phase shifts in switching between the respective PFC channels can allow increase of EMI filter corner frequency allowing reduction of size and cost of the EMI filter at some switching frequencies. Asymmetrical phase shifts (other than 360°/m) such as 360°/2m and other phase shifts and variations in m allow increase of EMI filter corner frequency at switching frequencies where symmetrical, 360°/m phase shifts provide no benefit to EMI filter design by providing cancellation or partial cancellation of different harmonics of the switching noise; which cancellation may be arranged to be complementary to the EMI filter function at more than one peak of the noise spectrum. (Such asymmetrical phase shifts do not significantly increase ripple and consequent switching noise). Alteration of m and corresponding alteration of phase shift may be performed adaptively for purposes of improving efficiency at light loads and the like.

摘要翻译： 在具有并联连接的m = 2个或更多个功率因数校正（PFC）电路的通道和与其串联连接的电磁干扰（EMI））滤波器的功率转换器中，在相应PFC通道之间的切换中的相移可允许增加EMI滤波器 转角频率允许在某些开关频率下降低EMI滤波器的尺寸和成本。 360°/ 2m以外的不对称相移（360°/ 2m）和其它相移以及m的变化允许在对称的开关频率下增加EMI滤波器转角频率，360°/ m相移对EMI滤波器无益 通过提供消除或部分消除开关噪声的不同谐波的设计; 该消除可以被布置为在噪声谱的多于一个峰值处与EMI滤波器功能互补。 （这种非对称相移不会显着增加纹波和随之而来的开关噪声）。 m的改变和相移的相应改变可以自适应地进行，以提高轻负载等的效率。

公开(公告)号：US07196914B2

公开(公告)日：2007-03-27

申请号：US10992227

申请日：2004-11-19

申请人： Yuancheng Ren ,  Fred C. Lee ,  Ming Xu

发明人： Yuancheng Ren ,  Fred C. Lee ,  Ming Xu

IPC分类号： H02M3/335

CPC分类号： H02M3/33592 ,  H02M3/33569 ,  Y02B70/1433 ,  Y02B70/1475

摘要： Power converters having reduced body diode conduction loss, reduced reverse recovery loss and lower switching noise, among other benefits, have a resonant capacitor Cr connected across an unfiltered output. The resonant capacitor Cr resonates with the leakage inductance Lk of the transformer. The resonant capacitor and leakage inductance are selected such that ½ a LC resonance period is equal to an ON time of each secondary switch S1 S2. The resonance provides zero current switching for secondary switches S1 S2, eliminates zero body diode conduction during dead times, and eliminates reverse recovery losses in the secondary switches. The present invention is applicable to many different circuit topologies such as full bridge, active clamp forward, push-pull forward, and center-tap secondary. The present converters provide high energy conversion efficiency and high frequency operation.

摘要翻译： 具有降低的体二极管导通损耗，降低的反向恢复损耗和较低开关噪声以及其他益处的功率转换器具有连接在未滤波输出端的谐振电容器Cr。 谐振电容器Cr与变压器的漏电感Lk共振。 谐振电容器和漏电感被选择为使得LC共振周期的1/2相当于每个次级开关S 1 S 2的导通时间。 谐振为次级开关S 1 S 2提供零电流开关，在死区时间消除零体二极管导通，并消除次级开关中的反向恢复损耗。 本发明可应用于许多不同的电路拓扑，例如全桥，有源钳前进，推挽前进和中心抽头次级。 本转换器提供高能量转换效率和高频操作。

公开(公告)号：US07071660B2

公开(公告)日：2006-07-04

申请号：US11018920

申请日：2004-12-22

申请人： Ming Xu ,  Jinghai Zhou ,  Yuancheng Ren ,  Fred C. Lee ,  Jia Wei

发明人： Ming Xu ,  Jinghai Zhou ,  Yuancheng Ren ,  Fred C. Lee ,  Jia Wei

IPC分类号： H02M3/158

CPC分类号： H02M3/156 ,  H02M2001/0019 ,  H02M2001/0032 ,  H02M2001/007 ,  Y02B70/16

摘要： A two-stage power converter that dynamically adjusts to output current requirements includes a first stage regulator that provides power to a second stage regulator. The first stage can be a buck converter, and the second stage can be a multiple-phase buck converter. The output voltage of the first stage (intermediate bus voltage Vbus) is varied according to the load current to optimize conversion efficiency. To provide maximum efficiency, the Vbus voltage is increased as load current increases. The Vbus voltage provided by the first stage can be varied by duty cycle or operating frequency control. In another embodiment, the switching frequency of the second stage is varied as output current changes so that output current ripple is held constant. In an embodiment employing a multiple-phase buck converter in the second stage, the number of operating phases are varied as output current changes.

摘要翻译： 动态调节输出电流要求的两级功率转换器包括为第二级调节器提供电源的第一级稳压器。 第一级可以是降压转换器，第二级可以是多相降压转换器。 第一级（中间总线电压Vbus）的输出电压根据负载电流而变化，以优化转换效率。 为了提供最大的效率，Vbus电压随着负载电流的增加而增加。 第一级提供的Vbus电压可以通过占空比或工作频率控制来改变。 在另一个实施例中，当输出电流改变时，第二级的开关频率变化，使得输出电流纹波保持恒定。 在第二级采用多相降压转换器的实施例中，随着输出电流的变化，工作阶段的数量变化。