-
公开(公告)号：US20250006423A1
公开(公告)日：2025-01-02
申请号：US18760320
申请日：2024-07-01
Applicant: VIRGINIA TECH INTELLECTUAL PROPERTIES, INC.
Inventor： Pranav Raj Prakash , Ahmed Nabih , Qiang Li
Abstract: An example transformer cell includes a printed circuit board (PCB) having a plurality of layers and at least two transformers. The at least two transformers include a primary winding implemented in a plurality of primary layers among the plurality of layers, a plurality of secondary windings implemented in a plurality of secondary layers among the plurality of layers, and a core extending through the primary winding and the plurality of secondary windings. The transformer cell further includes a first output capacitor located above a top layer among the plurality of layers and along a first edge of the PCB, a second output capacitor located above the top layer along a second edge of the PCB, the second edge being opposite the first edge. The transformer cell additionally includes one or more switching devices located between the first and the second output capacitors.
-
公开(公告)号：US12009146B2
公开(公告)日：2024-06-11
申请号：US16864868
申请日：2020-05-01
Applicant: Virginia Tech Intellectual Properties, Inc.
Inventor： Ahmed Nabih , Qiang Li , Fred C. Lee
CPC classification number: H01F27/346 , H01F27/24 , H01F27/2804 , H01F27/34 , H01F30/04 , H01F2027/2819 , H01F2038/026
Abstract: Various examples of magnetic integration of matrix transformers with controllable leakage inductance are described. In one example, a transformer includes a magnetic core comprising a plurality of core legs and a leakage core leg. The leakage core leg is positioned among the plurality of core legs to control a leakage inductance of the transformer. The transformer also includes a planar winding structure. The planar winding structure includes a primary winding and a plurality of secondary windings. The primary winding and the plurality of secondary windings extend in a number of turns around the plurality of core legs, without a turn around the leakage core leg, to further control the leakage inductance of the matrix transformer.
-
公开(公告)号：US11545900B2
公开(公告)日：2023-01-03
申请号：US16865236
申请日：2020-05-01
Applicant: VIRGINIA TECH INTELLECTUAL PROPERTIES, INC.
Inventor： Mohamed Ahmed , Fred C. Lee , Qiang Li
Abstract: Aspects of an efficient, wide voltage range, power converter system are described. In one example, a power converter system includes a first power converter, a second power converter, and a controller for the power converter. An input of the first power converter and an input of the second power converter are connected in series across an input voltage for the power converter system, and an output of the first power converter and an output of the second power converter are connected in parallel at an output of the power converter system. The controller is configured to regulate the second power converter and to determine whether or not to regulate the first power converter based on the input voltage for the power converter system and an output voltage of the power converter system, among other factors, for greater efficiency of the power converter system over wider input and output voltage ranges.
-
44.发明申请公开(公告)号：US20220385198A1
公开(公告)日：2022-12-01
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
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：US20220311277A1
公开(公告)日：2022-09-29
申请号：US17211215
申请日：2021-03-24
Applicant: VIRGINIA TECH INTELLECTUAL PROPERTIES, INC.
Inventor： Junjie Feng , Qiang Li , Fred C. Lee
Abstract: In one example, a planar omnidirectional wireless power transfer system includes high frequency power generator configured to generate a supply of high frequency oscillating power, a number of transmitter-side resonant tank circuits electrically coupled to the high frequency power generator, a planar coil arrangement including a number of coils arranged for omnidirectional power transfer to a device placed over the planar coil arrangement, and a controller configured to activate individual ones of the transmitter-side resonant tank circuits to wirelessly transmit power to the device. In one aspect, the controller can activate individual ones of the transmitter-side resonant tank circuits over time to generate an omnidirectional field distribution for wireless power transmission.
-
Patent Agency Ranking
公开(公告)号：US20220293326A1
公开(公告)日：2022-09-15
申请号：US17199953
申请日：2021-03-12
Applicant: Virginia Tech Intellectual Properties, Inc.
Inventor： Feiyang Zhu , Qiang Li , Fred C. Lee
Abstract: Aspects of multi-phase integrated coupled inductors are described. In one embodiment, a multi-phase integrated coupled inductor includes a magnetic core and a coupled set of inductors. Each inductor can include conductive vias that are asymmetrically distributed in two symmetrical core slots in the magnetic core, so that each inductor has a different number of lateral-flux vias in each slot.
-
公开(公告)号：US20200350117A1
公开(公告)日：2020-11-05
申请号：US16864868
申请日：2020-05-01
Applicant: Virginia Tech Intellectual Properties, Inc.
Inventor： Ahmed Nabih , Qiang Li , Fred C. Lee
Abstract: Various examples of magnetic integration of matrix transformers with controllable leakage inductance are described. In one example, a transformer includes a magnetic core comprising a plurality of core legs and a leakage core leg. The leakage core leg is positioned among the plurality of core legs to control a leakage inductance of the transformer. The transformer also includes a planar winding structure. The planar winding structure includes a primary winding and a plurality of secondary windings. The primary winding and the plurality of secondary windings extend in a number of turns around the plurality of core legs, without a turn around the leakage core leg, to further control the leakage inductance of the matrix transformer.
-
公开(公告)号：US10109404B2
公开(公告)日：2018-10-23
申请号：US14956948
申请日：2015-12-02
Applicant: Virginia Tech Intellectual Properties, Inc.
Inventor： Yipeng Su , Dongbin Hou , Fred C. Lee , Qiang Li
IPC: H01F5/00 , H01F27/28 , H01F1/14 , H01F17/00 , H05K1/03 , H01F3/14 , H02M3/155 , H05K1/02 , H05K1/16
Abstract: A low profile inductor structure suitable for use in a high power density power converter has one or more windings formed by vias through a thin, generally planar body of magnetic material forming the inductor core and conductive cladding on the body of magnetic material or material covering the magnetic material body. Variation of inductance with load current and other operational or environmental parameters is reduced to any desired degree by forming a slot that removes all or a portion of the magnetic material between the locations of the vias.
-
公开(公告)号：US20180226182A1
公开(公告)日：2018-08-09
申请号：US15656198
申请日：2017-07-21
Applicant: Virginia Tech Intellectual Properties, Inc.
Inventor： Chao Fe , Fred C. Lee , Qiang Li
IPC: H01F27/245 , H01F27/28 , H02M3/335 , H01F27/30
CPC classification number: H01F27/245 , H01F27/2804 , H01F27/306 , H01F27/38 , H01F2027/2809 , H01F2027/2819 , H01F2038/006 , H02M3/285 , H02M3/33523 , H02M3/33592 , H02M3/3376 , Y02B70/1433 , Y02B70/1475
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：US09847710B2
公开(公告)日：2017-12-19
申请号：US15085225
申请日：2016-03-30
Applicant: Virginia Tech Intellectual Properties, Inc.
Inventor： Fred C. Lee , Xiucheng Huang , Qiang Li
CPC classification number: H02M1/4258 , H02M1/44 , H02M3/33592 , H02M2001/0058 , Y02B70/126 , Y02B70/1433 , Y02B70/1475 , Y02B70/1491
Abstract: A two-stage power converter architecture including an isolation transformer and rectification of the isolation transformer output by an LLC resonant circuit and methodology for operating the same feeds an output voltage back to a circuit for generating waveforms for controlling a totem pole circuit to provide output voltage regulation as well as rectification of AC input voltage. The circuit for controlling the totem pole circuit may also be responsive to the AC input power waveform to provide power factor correction (PFC), in which case, the feedback signal provides additional pulse width modulation of the PFC signals. Bus capacitor size may also be reduced by injecting harmonics of the AC input waveform into the feedback signal which also serves to substantially maintain efficiency of the (preferably LLC) resonant second stage.
-
-
-
-
-
-
-
-
-
Search Results
55
records
(took 0.025 seconds)
