公开(公告)号：US6147882A

公开(公告)日：2000-11-14

申请号：US215758

申请日：1998-12-19

申请人： Laszlo Huber ,  Jindong Zhang ,  Milan M. Jovanovic ,  Fred C. Lee

发明人： Laszlo Huber ,  Jindong Zhang ,  Milan M. Jovanovic ,  Fred C. Lee

IPC分类号： H02M1/00 ,  H02M1/10 ,  H02M1/42 ,  H02M1/12

CPC分类号： H02M1/4258 ,  H02M1/10 ,  Y02B70/126

摘要： A single-stage input-current-shaping (S.sup.2 ICS) converter of the present invention integrates a voltage-doubler-rectifier front-end with a DC/DC output stage. Two families of voltage-doubler S.sup.2 ICS converters are disclosed. In one family, a 2-terminal dither source is provided between a boost inductor and a common input terminal of a storage capacitor and the DC/DC output stage. The 2-terminal dither source includes two paths connected in parallel: a first path for charging and a second path for discharging the boost inductor at a high frequency (HF). In the other family, a 3-terminal dither source includes a third terminal coupled to a pulsating node of the DC/DC output stage. In the 3-terminal dither source, the HF charging path of the boost inductor is coupled between the boost inductor and the pulsating node of the DC/DC output stage, while the HF discharging path of the boost inductor is coupled between the boost inductor and the common input terminal of the storage capacitor and the DC/DC output stage. Due to the voltage-doubler-rectifier front-end, reduction of line-current harmonics can be achieved with a higher conversion efficiency, as compared to a corresponding S.sup.2 ICS converter with a conventional full-bridge rectifier. In addition, a converter of the present invention requires storage capacitors of a lower voltage rating and a smaller total capacitance than the conventional S.sup.2 ICS counterpart. The present invention thereby reduces the size and the cost of the power supply.

摘要翻译： 本发明的单级输入电流整形（S2ICS）转换器将倍压整流器前端与DC / DC输出级相集成。 公开了两个倍压器S2ICS转换器系列。 在一个系列中，在升压电感器和存储电容器的公共输入端子和DC / DC输出级之间提供2端子抖动源。 2端抖动源包括并联连接的两条路径：用于充电的第一路径和用于以高频（HF）放电升压电感器的第二路径。 在另一系列中，3端抖动源包括耦合到DC / DC输出级的脉动节点的第三端。 在三端抖动源中，升压电感器的HF充电路径耦合在升压电感器和DC / DC输出级的脉动节点之间，而升压电感器的HF放电路径耦合在升压电感器和 存储电容的公共输入端和DC / DC输出级。 由于电压 - 倍增器整流器前端，与具有常规全桥整流器的相应的S2ICS转换器相比，可以以更高的转换效率实现线路电流谐波的降低。 此外，本发明的转换器需要比传统的S2ICS对应物更低的额定电压和更小的总电容的存储电容器。 因此，本发明减小了电源的尺寸和成本。

公开(公告)号：US4860184A

公开(公告)日：1989-08-22

申请号：US249930

申请日：1988-09-27

申请人： Wojciech A. Tabisz ,  Fred C. Lee ,  Milan M. Jovanovic

发明人： Wojciech A. Tabisz ,  Fred C. Lee ,  Milan M. Jovanovic

IPC分类号： H02M3/155 ,  H02M3/335 ,  H02M3/337

CPC分类号： H02M3/337 ,  H02M3/155 ,  H02M3/335 ,  H02M3/33592 ,  Y02B70/1433 ,  Y02B70/1475

摘要： A half-bridge zero-voltage-switched multi-resonant converter. The converter basically comprises a device for converting an input voltage signal to a DC output signal to be imposed across a load. The device includes input terminals for receiving the input signal and output terminals for imposing the DC output signal across the load. Serially connected first and second switching assemblies are connected in parallel across the input terminals. Each of the first and second switching assemblies includes a transistor switch, a diode and a capacitor all arranged in parallel. The device further includes a transformer having a primary winding and serially connected first and second secondary windings. A first rectifier in parallel with a first resonant capacitor is used to connect the first secondary winding across the output terminals. Circuitry is provided for connecting the primary winding of the transformer to the input terminals and to the serial connection between the first and second switching assemblies. In order to complete the zero-voltage-switched multi-resonant converter for off-line use, a resonant circuit is formed with the first and second resonant capacitors and the total inductance of the primary winding of the transformer.

摘要翻译： 半桥零电压开关多谐振转换器。 该转换器基本上包括用于将输入电压信号转换为跨负载施加的DC输出信号的装置。 该装置包括用于接收输入信号的输入端和用于在整个负载上施加直流输出信号的输出端。 串联的第一和第二开关组件在输入端子上并联连接。 第一和第二开关组件中的每一个包括并联布置的晶体管开关，二极管和电容器。 该装置还包括具有初级绕组和串联连接的第一和第二次级绕组的变压器。 与第一谐振电容器并联的第一整流器用于将第一次级绕组连接在输出端子上。 提供了用于将变压器的初级绕组连接到输入端子和第一和第二开关组件之间的串联连接的电路。 为了完成用于离线使用的零电压开关多谐振转换器，谐振电路与第一和第二谐振电容器和变压器初级绕组的总电感一起形成。

公开(公告)号：US5325283A

公开(公告)日：1994-06-28

申请号：US896093

申请日：1992-06-08

申请人： Richard W. Farrington ,  Milan M. Jovanovic ,  Fred C. Lee

发明人： Richard W. Farrington ,  Milan M. Jovanovic ,  Fred C. Lee

IPC分类号： H02M3/335 ,  H02M3/337

CPC分类号： H02M3/335 ,  H02M3/337 ,  Y02B70/1433

摘要： An isolated zero-voltage-switching converter in which the magnetizing inductance of the isolating transformer is a resonant element and an open circuit is provided on the secondary side of the transformer during the time interval when both primary switches are off. When the secondary of the transformer is open, the magnetizing inductance is in series with the capacitances of the primary switches, thus forming a resonant circuit.

摘要翻译： 隔离变压器的励磁电感是谐振元件的绝缘零电压开关变换器，并且在两个初级开关断开的时间间隔期间，在变压器的次级侧设置开路。 当变压器的次级开路时，励磁电感与初级开关的电容串联，从而形成谐振电路。

公开(公告)号：US08598807B2

公开(公告)日：2013-12-03

申请号：US13114181

申请日：2011-05-24

申请人： Shu Ji ,  Haoran Wu ,  Fred C. Lee

发明人： Shu Ji ,  Haoran Wu ,  Fred C. Lee

IPC分类号： H05B37/02

CPC分类号： H05B33/0815 ,  H05B33/0851 ,  Y02B20/347

摘要： A multi-channel circuit having respective channels powered through transformers having primary windings connected in series allows substantially equal constant currents to be provided through all channels by cross-regulation while only a single channel need be monitored and controlled. The variation in current between channels is generally small and largely insensitive to imbalances between voltages on loads due, for example, to different numbers of LEDs in series connected strings in illumination devices and can be further reduced by inverse coupling between inductors in respective channels. Efficiency is improved through reduction in the number of stages of the constant current source since the respective channels provided both DC-to-DC conversion and constant current regulation.

摘要翻译： 具有由具有串联连接的初级绕组的变压器供电的各个通道的多通道电路允许通过交叉调节提供通过所有通道的基本相等的恒定电流，而仅需要监测和控制单个通道。 通道之间的电流变化通常较小，并且对负载电压之间的不平衡很大程度上不敏感，这是由于例如照明装置中串联连接的串中的不同数量的LED，并且可以通过相应通道中的电感器之间的反耦合来进一步减少。 由于各个通道提供DC-DC转换和恒定电流调节，所以通过减少恒流源的级数来提高效率。

公开(公告)号：US20110291574A1

公开(公告)日：2011-12-01

申请号：US13114181

申请日：2011-05-24

申请人： Shu Ji ,  Haoran Wu ,  Fred C. Lee

发明人： Shu Ji ,  Haoran Wu ,  Fred C. Lee

IPC分类号： H05B37/02

CPC分类号： H05B33/0815 ,  H05B33/0851 ,  Y02B20/347

摘要： A multi-channel circuit having respective channels powered through transformers having primary windings connected in series allows substantially equal constant currents to be provided through all channels by cross-regulation while only a single channel need be monitored and controlled. The variation in current between channels is generally small and largely insensitive to imbalances between voltages on loads due, for example, to different numbers of LEDs in series connected strings in illumination devices and can be further reduced by inverse coupling between inductors in respective channels. Efficiency is improved through reduction in the number of stages of the constant current source since the respective channels provided both DC-to-DC conversion and constant current regulation.

摘要翻译： 具有由具有串联连接的初级绕组的变压器供电的各个通道的多通道电路允许通过交叉调节提供通过所有通道的基本相等的恒定电流，而仅需要监测和控制单个通道。 通道之间的电流变化通常较小，并且对负载电压之间的不平衡很大程度上不敏感，这是由于例如照明装置中串联连接的串中的不同数量的LED，并且可以通过相应通道中的电感器之间的反耦合来进一步减少。 由于各个通道提供DC-DC转换和恒定电流调节，所以通过减少恒流源的级数来提高效率。

公开(公告)号：US20110140679A1

公开(公告)日：2011-06-16

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： G05F1/10

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： 电源转换器拓扑在开关周期的第一，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冲宽度调制的转换器，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：US07602159B2

公开(公告)日：2009-10-13

申请号：US11678864

申请日：2007-02-26

申请人： Shuo Wang ,  Fred C. Lee

发明人： Shuo Wang ,  Fred C. Lee

IPC分类号： G05F1/00 ,  G05F1/33

CPC分类号： H04B15/02

摘要： A negative capacitance is developed by configuring an inductor as two inversely or opposingly coupled windings having different numbers of turns and connecting a capacitance to a center tap between the two windings. The negative capacitance is developed on the side of the inductor having the winding with the greater number of turns. The negative capacitance so developed may advantageously be used to cancel any capacitance or parasitic capacitance desired for reducing power loss, increasing switching speed or reducing or eliminating common mode noise in a switched circuit such as a switched power converter

摘要翻译： 通过将电感器配置为具有不同匝数的两个反相或相对耦合的绕组并将电容连接到两个绕组之间的中心抽头来开发负电容。 在具有较大匝数的绕组的电感器的侧面上产生负电容。 这样显影的负电容可以有利地用于消除所需的电容或寄生电容，以减少功率损耗，提高开关速度，或者减少或消除诸如开关功率转换器的开关电路中的共模噪声

公开(公告)号：US20080094160A1

公开(公告)日：2008-04-24

申请号：US11850762

申请日：2007-09-06

申请人： Shuo Wang ,  Fred C. Lee

发明人： Shuo Wang ,  Fred C. Lee

IPC分类号： H01F29/02

CPC分类号： H01F17/062 ,  H01F27/34 ,  H01F27/38 ,  H03H7/427 ,  H03H2001/0035 ,  H03H2001/005 ,  H03H2001/0057 ,  H03H2001/0092

摘要： An inductor device or filter such as an electromagnetic interference (EMI) filter which includes an inductor provides cancellation of parasitic capacitance of the inductor and extends high frequency performance of the inductor or filter by using an inductor network (a special case being split windings) and including capacitors to couple signals corresponding to those which are passed by the equivalent parallel capacitance of an inductor of a network of inductors such as in a multi-phase power supply of voltage converter to another inductor terminal, ground or an inductor in the ground return path. Cancellation of parasitic capacitance is provided for differential mode and common mode windings where the windings may be either inductively coupled or not. Forming the windings as a bifilar winding to increase coupling coefficient further improves performance and allows cancellation (as distinct from parasitic capacitance reduction) and avoidance of resonance in circuits in which an inductor is not permitted in the ground return path. Different inductance values and turns ratios of any or all inductors of the network, including multi-phase networks, may be accommodated.

摘要翻译： 包括电感器的电感器件或滤波器例如电磁干扰（EMI）滤波器提供消除电感器的寄生电容，并通过使用电感器网络（特殊情况是分流绕组）来延长电感器或滤波器的高频性能，以及 包括电容器，用于耦合与电感器网络的电感器的等效并联电容（例如在电压转换器的多相电源）中的等效并联电容相对应的信号到另一个电感器端子，接地或接地返回路径中的电感器 。 为差分模式和共模绕组提供寄生电容的取消，其中绕组可以感应耦合或不耦合。 将绕组形成为双线绕组以增加耦合系数进一步提高性能并允许抵消（与寄生电容降低不同）和避免在接地返回路径中不允许电感器的电路中的谐振。 可以适应网络的任何或所有电感器（包括多相网络）的不同的电感值和匝数比。

公开(公告)号：US07254047B2

公开(公告)日：2007-08-07

申请号：US11094434

申请日：2005-03-31

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

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

IPC分类号： H02M3/335

CPC分类号： H02M3/33592 ,  H02M3/3376 ,  H02M2001/0058 ,  Y02B70/1433 ,  Y02B70/1475 ,  Y02B70/1491

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优点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：US07233132B1

公开(公告)日：2007-06-19

申请号：US11341874

申请日：2006-01-30

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

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

IPC分类号： G05F1/575 ,  G05F1/618

CPC分类号： H02M3/1584 ,  H02M2001/0009

摘要： Voltage regulators often have coupled output inductors because coupled output inductors provide improvements in cost and efficiency. Coupled inductors are often used in multi-phase voltage regulators. Feedback control of voltage regulators often requires accurate and responsive sensing of output current. Provided is a technique for accurately sensing the magnitude of output current in coupled inductors. An RC circuit (comprising a resistor and capacitor in series) is connected in parallel with the coupled inductor. The inductor has a leakage inductance Lk and a DC (ohmic) resistance of DCR. The resistor and capacitor are selected such that an RC time constant is equal to an L/R time constant of Lk/DCR. With the matching time constants, a sum of voltages on the capacitors is accurately proportional to a sum of currents flowing in the output inductors. Also provided is a technique for sensing current when an uncoupled center tap inductor is present.

摘要翻译： 电压调节器通常具有耦合输出电感器，因为耦合的输出电感器提供了成本和效率的改进。 耦合电感通常用于多相电压调节器。 电压调节器的反馈控制通常需要精确和响应的输出电流感测。 提供了一种用于精确地感测耦合电感器中的输出电流的大小的技术。 RC电路（包括串联的电阻器和电容器）与耦合的电感器并联连接。 电感器具有DCR的漏电感Lk和DC（欧姆）电阻。 选择电阻器和电容器使得RC时间常数等于Lk / DCR的L / R时间常数。 使用匹配的时间常数，电容器上的电压之和与输出电感器中流过的电流之和正好成正比。 还提供了当存在非耦合中心抽头电感器时感测电流的技术。