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1. 发明授权

US4720667A Zero-current switching quasi-resonant converters operating in a full-wave mode 失效
标题翻译：零电流开关准谐振转换器工作在全波模式
公开(公告)号：US4720667A
公开(公告)日：1988-01-19
申请号：US877184
申请日：1986-06-20
申请人： Fred C. Lee , Kwang-Hwa Liu
发明人： Fred C. Lee , Kwang-Hwa Liu
IPC分类号： H02M3/155 , H02M3/335 , G05F1/40
CPC分类号： H02M3/33538 , H02M3/155 , H02M3/335 , Y02B70/1433
摘要： A family of quasi-resonant converters for providing regulated power is disclosed as comprising a voltage source, a load and a resonant switch circuit, for periodically connecting the voltage source to the load. The resonant switch circuit includes a switch, and a resonant circuit comprised of a resonant capacitor and a resonant inductor. The switch is actuated to its first state to permit a current flow in a first direction from the voltage source to the load and to block a current flow in a second, opposite direction, and deactuated to a second state to permit a current flow in the second direction from the load to the voltage source and to block the current flow in the first direction, whereby the quasi-resonant converter is operative in a full-wave mode. More specifically, the switch in its first state couples the resonant capacitor and the resonant inductor together to form a resonant switch circuit. The impedances of the resonant capacitor and the resonant inductor are selected to establish a resonating current waveform on the resonant inductor to apply zero-current conditions to the switch at turn on and turn off.
摘要翻译：公开了一种用于提供稳压电源的准谐振转换器系列，其包括用于将电压源周期性地连接到负载的电压源，负载和谐振开关电路。谐振开关电路包括开关和由谐振电容器和谐振电感器组成的谐振电路。开关被致动到其第一状态以允许从电压源到负载的第一方向上的电流流动并且阻挡在第二相反方向上的电流，并且停止到第二状态以允许电流在从负载到电压源的第二方向，并且阻止在第一方向上的电流，由此准谐振转换器以全波模式工作。更具体地，其第一状态的开关将谐振电容器和谐振电感器耦合在一起以形成谐振开关电路。选择谐振电容器和谐振电感器的阻抗以在谐振电感器上建立谐振电流波形，以在开启和关闭时向开关施加零电流条件。

2. 发明授权

US4785387A Resonant converters with secondary-side resonance 失效
标题翻译：具有次级侧共振的谐振变换器
公开(公告)号：US4785387A
公开(公告)日：1988-11-15
申请号：US856775
申请日：1986-04-28
申请人： Fred C. Lee , Kwang-Hwa Liu
发明人： Fred C. Lee , Kwang-Hwa Liu
IPC分类号： H02M3/28 , H02M3/335 , H02M3/337
CPC分类号： H02M3/335 , H02M3/28 , H02M3/33538 , H02M3/337 , H02M3/3372 , Y02B70/1433
摘要： A family of quasi-resonant converters is disclosed as comprising a voltage source, a transformer having primary and secondary windings, and a switch for periodically coupling the voltage source to the primary winding, whereby a charging current appears on the secondary winding. The transformer exhibits a characteristic leakage inductance. A capacitor exhibiting a characteristic capacitance is coupled to the secondary winding to form a resonant circuit including the leakage inductance and the capacitor. The secondary winding is coupled to apply the charging current to the capacitor. A rectifying circuit couples the capacitor to a load, whereby the voltage stored in the capacitor is delivered to the load. The capacitor is directly connected to the secondary winding and to the rectifying circuit to permit positive and negative going voltages to be stored therein, whereby magnetic flux within the core of the transformer is dissipated and the transformer magnetically reset.
摘要翻译：公开了一种准谐振转换器，其包括电压源，具有初级和次级绕组的变压器以及用于将电压源周期性地耦合到初级绕组的开关，由此在次级绕组上出现充电电流。变压器表现出特性漏电感。具有特性电容的电容器耦合到次级绕组以形成包括漏电感和电容器的谐振电路。次级绕组被耦合以将充电电流施加到电容器。整流电路将电容器耦合到负载，由此存储在电容器中的电压被传送到负载。电容器直接连接到次级绕组和整流电路，以允许正负电压存储在其中，从而消除变压器磁芯内的磁通量并使变压器磁复位。

3. 发明授权

US4720668A Zero-voltage switching quasi-resonant converters 失效
标题翻译：零电压开关准谐振转换器
公开(公告)号：US4720668A
公开(公告)日：1988-01-19
申请号：US877185
申请日：1986-06-20
申请人： Fred C. Lee , Kwang-Hwa Liu
发明人： Fred C. Lee , Kwang-Hwa Liu
IPC分类号： H02M3/155 , G05F1/40
CPC分类号： H02M3/155
摘要： A quasi-resonant converter is disclosed as comprising a power source, a load and a resonant switch circuit for periodically connecting the power source to the load. The resonant switch circuit includes a switch for connecting the power source to the load and for disconnecting the power source from the load, and a resonant circuit comprised of a resonant capacitor and a resonant inductor. The switch is operated at a switching frequency in excess of 1 MHz and in the order of 10 to 20 MHz or greater. The resonant circuit is connected to the switch to impose thereon a voltage waveform as developed across the resonant capacitor. The resonant capacitor and the resonant inductor have respective impedances selected to shape the voltage waveform such that a zero-voltage condition is imposed upon the switch when it is disposed to its on state, whereby the parasitic capacitive losses associated with the switch are eliminated.
摘要翻译：公开了一种准谐振转换器，其包括用于将电源周期性地连接到负载的电源，负载和谐振开关电路。谐振开关电路包括用于将电源连接到负载并用于将电源与负载断开的开关，以及由谐振电容器和谐振电感器组成的谐振电路。开关以超过1MHz的开关频率操作，并且在10至20MHz或更大的量级下操作。谐振电路连接到开关以施加在谐振电容器两端形成的电压波形。谐振电容器和谐振电感器具有相应的阻抗，其被选择成使电压波形成形，使得当其被置于其导通状态时，零开关施加零电压状态，从而消除与开关相关联的寄生电容性损耗。

4. 发明授权

US08598807B2 Multi-channel constant current source and illumination source 有权
标题翻译：多通道恒流源和照明源
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。

5. 发明申请

US20110291574A1 MULTI-CHANNEL CONSTANT CURRENT SOURCE AND ILLUMINATION SOURCE 有权
标题翻译：多通道恒流源和照明源
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。

6. 发明申请

US20110140679A1 Switching Capacitor-PWM Power Converter 有权
标题翻译：开关电容 - PWM功率转换器
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。

7. 发明授权

US07602159B2 Common mode noise reduction using parasitic capacitance cancellation 失效
标题翻译：使用寄生电容消除的共模降噪
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

8. 发明申请

US20080094160A1 GENERALIZED CANCELLATION OF INDUCTOR WINDING CAPACITANCE 失效
标题翻译：电感式绕组电容的一般取消
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。

9. 发明授权

US07254047B2 Power converters having output capacitor resonant with autotransformer leakage inductance 有权
标题翻译：具有输出电容器的功率转换器与自耦变压器漏感谐振
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。

10. 发明授权

US07233132B1 Current sensing in multiple coupled inductors by time constant matching to leakage inductance 有权
标题翻译：通过时间常数匹配到漏电感的多个耦合电感中的电流检测
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。

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