公开(公告)号：US20150277460A1

公开(公告)日：2015-10-01

申请号：US14674680

申请日：2015-03-31

Applicant: Virginia Tech Intellectual Properties, Inc.

Inventor： Pei-Hsin Liu ,  Qiang Li ,  Fred C. Lee

IPC: G05F1/56

CPC classification number: G05F1/56 ,  H02M3/1584 ,  H02M2003/1586 ,  H03L7/06

Abstract: In a multi-phase power converter using a phase-locked loop (PLL) arrangement for interleaving of pulse frequency modulated (PFM) pulses of the respective phases, improved transient response, improved stability of high bandwidth output voltage feedback loop, guaranteed stability of the PLL loop and avoidance of jittering and phase cancellation issues are achieved by anchoring the bandwidth at the frequency of peak phase margin. This methodology is applicable to multi-phase power conveners of any number of phases and any known or foreseeable topology for individual phases and is not only applicable to power converters operating under constant on-time control, but is extendable to ramp pulse modulation (RPM) control and hysteresis control. Interleaving of pulses from all phases is simplified through use of phase managers with a reduced number of PLLS using hybrid interleaving arrangements that do not exhibit jittering even when ripple is completely canceled.

Abstract translation: 在使用锁相环（PLL）布置用于交错各相的脉冲频率调制（PFM）脉冲的多相功率转换器中，改进的瞬态响应，改进的高带宽输出电压反馈回路的稳定性，保证了 通过将带宽锚定在峰值相位裕度的频率来实现PLL环路和避免抖动和相位消除问题。 该方法适用于任何阶段的任何阶段的多相功率调节器以及用于各个相的任何已知或可预见的拓扑，并且不仅适用于在恒定导通时间控制下工作的功率转换器，而且可扩展到斜坡脉冲调制（RPM） 控制和滞后控制。 通过使用具有减少数量的PLLS的相位管理器来简化来自所有相的脉冲的交错，即使在纹波被完全取消时也不会出现抖动的混合交错布置。

公开(公告)号：US20150062989A1

公开(公告)日：2015-03-05

申请号：US14177531

申请日：2014-02-11

Applicant: Virginia Tech Intellectual Properties, Inc.

Inventor： Yipeng Su ,  Qiang Li ,  Fred C. Lee ,  Wenli Zhang

IPC: H05K7/02

CPC classification number: H01F17/0033 ,  H01F2017/008 ,  H02M3/155 ,  H05K1/0233 ,  H05K1/0373 ,  H05K1/165 ,  H05K2201/0209 ,  H05K2201/0245 ,  H05K2201/086 ,  H05K2201/10015

Abstract: A low profile power converter structure is provide wherein volume is reduced and power density is increased to approach 1 KW/in3 by at least one of forming an inductor as a body of magnetic material embedded in a substrate formed by a plurality of printed circuit board (PCB) lamina and forming inductor windings of PCB cladding and vias which may be of any desired number of turns and may include inversely coupled windings and which provide a lateral flux path, forming the body of magnetic material from high aspect ratio flakes of magnetic material which are aligned with the inductor magnetic field in an insulating organic binder and hot-pressed and providing a four-layer architecture comprising two layers of PCB lamina including the embedded body of magnetic material, a shield layer and an additional layer of PCB lamina, including cladding for supporting and connecting a switching circuit, a capacitor and the inductor.

Abstract translation: 通过形成作为嵌入由多个印刷电路板形成的基板中的磁性材料的主体的电感器中的至少一个，提供体积减小并且功率密度增加到接近1KW / in 3的低剖面功率转换器结构（ PCB）层并且形成可以具有任何所需匝数的PCB包层和通孔的电感器绕组，并且可以包括反耦合绕组并且提供横向磁通路径，从磁性材料的高纵横比薄片形成磁性材料体 与绝缘有机粘合剂中的电感器磁场对准并热压，并提供包括两层PCB层的四层结构，包括磁性材料的嵌入体，屏蔽层和附加的PCB层的层，包括包层 用于支持和连接开关电路，电容器和电感器。

公开(公告)号：US20250046512A1

公开(公告)日：2025-02-06

申请号：US18362222

申请日：2023-07-31

Applicant: VIRGINIA TECH INTELLECTUAL PROPERTIES, INC.

Inventor： Ahmed Nabih ,  Feng Jin ,  Qiang Li

IPC: H01F27/28 ,  H01F27/26 ,  H02M1/00 ,  H02M3/335

Abstract: Power converters with integrated transformers and resonant inductors are described. An example power converter includes a primary-side converter stage, a number of secondary-side converter stages, and an integrated transformer and resonant inductor coupled between the primary-side and secondary-side converter stages. The integrated transformer includes a magnetic core having a first leg, an auxiliary leg, and a second leg. The integrated transformer also includes a first transformer having a first primary winding, a first secondary winding, and a first shield winding on the first leg, and a second transformer having a second primary winding, a second secondary winding, and a second shield winding on the second leg. The first shield winding is electrically coupled to provide an extension of the first primary winding for the first transformer, and an end of the first shield winding or the second shield winding is electrically coupled to a primary-side ground of the power converter.

公开(公告)号：US20240322668A1

公开(公告)日：2024-09-26

申请号：US18613616

申请日：2024-03-22

Applicant: VIRGINIA TECH INTELLECTUAL PROPERTIES, INC.

Inventor： Liyan Zhu ,  Qiang Li

IPC: H02M1/00 ,  H01F27/28 ,  H01F27/38 ,  H02M3/335

CPC classification number: H02M1/0064 ,  H01F27/2804 ,  H01F27/38 ,  H02M3/33584 ,  H01F2027/2819

Abstract: An example power converter may include a planar transformer including a magnetic core, a primary winding, a first secondary winding interleaved with the primary winding, and a second secondary winding interleaved with the primary winding. The magnetic core may include a first core half, a second core half, multiple auxiliary legs formed by the first core half and the second core half, and multiple core legs formed by the first core half and the second core half. The multiple core legs may include a central core leg, and the primary winding may be wound around the central core leg among the two or more core legs. The planar transformer may be electrically coupled between a primary-side converter stage and a secondary-side converter stage.

公开(公告)号：US11894778B2

公开(公告)日：2024-02-06

申请号：US17511753

申请日：2021-10-27

Applicant: VIRGINIA TECH INTELLECTUAL PROPERTIES, INC.

Inventor： Xin Lou ,  Qiang Li ,  Fred C. Lee

IPC: H02M3/335

CPC classification number: H02M3/33592

Abstract: Aspects of direct current (DC)-DC converters with an integrated matrix transformer and multiphase current doubler rectifiers are described. In some examples, a DC-DC converter can include a matrix transformer that has multiple magnetically integrated transformer components that are magnetically integrated using transformer components that share a top plate and a bottom plate. A multiphase current doubler rectifier can include multiple synchronous rectifiers corresponding to the plurality of transformer components of the matrix transformer.

公开(公告)号：US20230396180A1

公开(公告)日：2023-12-07

申请号：US18328372

申请日：2023-06-02

Applicant: VIRGINIA TECH INTELLECTUAL PROPERTIES, INC.

Inventor： Xin Lou ,  Qiang Li

IPC: H02M3/335 ,  H01F27/38 ,  H02M1/00 ,  H01F3/14 ,  H01F27/28

CPC classification number: H02M3/33592 ,  H01F27/38 ,  H02M1/0064 ,  H01F3/14 ,  H01F27/2804 ,  H01F2027/2819

Abstract: Power converters with current doubler rectifier output stages, current doubler rectifier output stages, and integrated transformers for current doubler rectifier output stages and related output stages are described. In one example, a power converter includes a switched bridged input stage and a current doubler rectifier output stage comprising an integrated transformer. The integrated transformer of the current doubler rectifier output stage includes magnetic cores. A primary winding and a secondary winding of the integrated transformer extend around each of the plurality of magnetic cores, and the integrated transformer further includes a coupling winding that extends around each of the plurality of magnetic cores to provide magnetic integration among the plurality of magnetic cores through an electrical coupling. The current doubler rectifier output stage relies upon magnetizing inductance of the integrated transformer to realize the function of inductors, and the integrated transformer current doubler rectifier does not include separate inductors.

公开(公告)号：US20220310303A1

公开(公告)日：2022-09-29

申请号：US17211975

申请日：2021-03-25

Applicant: VIRGINIA TECH INTELLECTUAL PROPERTIES, INC.

Inventor： Shuo Wang ,  Fred C. Lee ,  Qiang Li

IPC: H01F27/28 ,  H01F27/24 ,  H01F27/34 ,  H02M1/42

Abstract: Various examples of systems and methods for a coupled inductor winding structure for common-mode noise reduction is described herein. The coupled inductor structure can include a magnetic core including a first leg, a second leg, and a center leg; and a planar winding structure. The planar winding structures can include a first inductor winding for a forward path of a first phase of a power converter; a second inductor winding for a forward path of a second phase of the power converter; a third and fourth inductor winding for a return path. The third inductor winding having at least one turn interleaved within the number of first leg turns of the first inductor winding and configured to achieve unity coupling. The fourth inductor winding having at least one turn interleaved within the number of second leg turns of the second inductor winding and configured to achieve unity coupling.

公开(公告)号：US10910140B2

公开(公告)日：2021-02-02

申请号：US15656198

申请日：2017-07-21

Applicant: Virginia Tech Intellectual Properties, Inc.

Inventor： Chao Fei ,  Fred C. Lee ,  Qiang Li

IPC: H01F17/04 ,  H01F27/245 ,  H01F27/28 ,  H02M3/335 ,  H01F27/30 ,  H02M3/28 ,  H02M3/337 ,  H01F27/38 ,  H01F38/00

Abstract: A matrix transformer particularly suited to large voltage step-down, high current applications achieves increased good current sharing uniformity or air gap and electrical characteristics and reduced or eliminating termination losses, core losses and winding losses with a unitary magnetic core structure featuring sheets of magnetic material and a two-dimensional array of pillars on which windings, oriented in opposite directions on pillars that are adjacent in orthogonal directions, can be formed or placed comprising metallization on or embedded in a printed circuit board (PCB) structure. Magnetic flux density is reduced by at least one-half by dividing the magnetic flux in each pillar into two paths of increased width in the sheets of magnetic material. Magnetic flux density may be further decreased and flux uniformity improved by extending the sheets of magnetic material beyond a periphery defined by the pillar array.

公开(公告)号：US10790081B2

公开(公告)日：2020-09-29

申请号：US16252990

申请日：2019-01-21

Applicant: Virginia Tech Intellectual Properties, Inc.

Inventor： Chao Fei ,  Bin Li ,  Fred C. Lee ,  Qiang Li ,  Hongfei Wu

IPC: H01F27/28 ,  H01F27/24 ,  H01F27/06 ,  H02M1/15 ,  H02M3/335 ,  H02M3/158 ,  H02M7/5387 ,  H01F27/36

Abstract: Three-phase interleaved LLC and CLLC resonant converters, with integrated magnetics, are described. In various examples, the primary sides of the phases in the converters rely upon a half-bridge configuration and include resonant networks coupled to each other in delta-connected or common Y-node configurations. The secondary sides of the phases can rely upon a full-bridge configurations and are coupled in parallel. In one example, the transformers of the phases in the converters are integrated into one magnetic core. By changing the interleaving structure between the primary and secondary windings in the transformers, resonant inductors of the phases can also be integrated into the same magnetic core. A multi-layer PCB can be used as the windings for the integrated magnetics.

公开(公告)号：US10312805B2

公开(公告)日：2019-06-04

申请号：US15075553

申请日：2016-03-21

Applicant: Virginia Tech Intellectual Properties, Inc.

Inventor： Virginia Li ,  Pei-Hsin Liu ,  Qiang Li ,  Fred C. Lee

IPC: H02M3/156

Abstract: A power converter using constant on-time (COT) or ramp pulse modulation (RPM) control achieves more rapid resumption of steady-state operation after a step-up load transient by extending an on-time of a switching pulse by interrupting a ramp voltage waveform that is compared with a threshold that equals a threshold voltage at the termination of a switching pulse or increasing a voltage with which the ramp voltage is compared. These techniques are applied to both single-phase and multi-phase power converters.