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公开(公告)号：US20160301303A1
公开(公告)日：2016-10-13
申请号：US15089744
申请日：2016-04-04
Applicant: Virginia Tech Intellectual Properties, Inc.
Inventor： Syed Bari , Fred C. Lee , Qiang Li
IPC: H02M3/04
CPC classification number: H02M3/156 , H02M2003/1566
Abstract: an amount of charge transferred by a power converter is estimated by developing a signal that is a combination of signals representing an output voltage of a power converter and an inductor current of the power converter, charging a capacitor with a current proportional to that signal and comparing a voltage developed across the capacitor due to that charging to develop a signal for initiating a pulse to control input of power from a voltage source to the power converter. By using a signal developed in this way, response to both step-up and step-down transients can be improved and, in multi-phase embodiments, ripple cancellation problems such as noise susceptibility and loss of pulse generation can be entirely avoided.
Abstract translation: 通过开发作为代表功率转换器的输出电压的信号和电力转换器的电感器电流的组合的信号来估计由功率转换器传送的电荷量，用与该信号成比例的电流对电容器充电，并比较 由于充电而产生跨越电容器的电压，以产生用于启动脉冲以控制从电压源到功率转换器的功率输入的信号。 通过使用以这种方式开发的信号，可以提高对升压和降压瞬变的响应，并且在多相实施例中，可以完全避免纹波消除问题，例如噪声敏感性和脉冲产生损失。
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22.发明申请公开(公告)号：US20160086723A1
公开(公告)日：2016-03-24
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
CPC classification number: H01F1/14 , H01F3/14 , H01F17/0033 , H01F2017/002 , H02M3/155 , H05K1/0233 , H05K1/0373 , H05K1/165 , H05K2201/0209 , H05K2201/0245 , H05K2201/086 , H05K2201/10015
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.
Abstract translation: 适用于高功率密度功率转换器的低调电感器结构具有一个或多个绕组，其通过通过薄的大体平面的磁性材料体形成的通孔形成电感器芯和磁性材料或材料的主体上的导电包层， 磁性材料体。 具有负载电流和其他操作或环境参数的电感的变化通过形成在该通孔的位置之间去除磁性材料的全部或一部分的槽而减少到任何所需的程度。
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公开(公告)号：US20190355506A1
公开(公告)日：2019-11-21
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
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.
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公开(公告)号：US10454381B2
公开(公告)日：2019-10-22
申请号：US15693930
申请日：2017-09-01
Applicant: Virginia Tech Intellectual Properties, Inc.
Inventor： Bin Li , Zhengyang Liu , Fred C. Lee , Qiang Li
IPC: H02J7/00 , H02M3/335 , H02M1/088 , H02M1/42 , H02J7/04 , H02M1/14 , H01F27/24 , H01F27/28 , H02M3/337 , H02J7/02 , H01F27/34 , H02M1/00
Abstract: A variable direct current (DC) link power converter is described. In one example, the power converter includes a first converter stage configured to convert power from a power source to power at an intermediate link voltage and a second converter stage configured to convert the power at the intermediate link voltage to power for charging a battery. The power converter further includes a control system having an intermediate link voltage regulation control loop configured, in a first mode of operation, to regulate the intermediate link voltage through the first converter stage based on a voltage of the battery, and a ripple regulation control loop configured to sense a charging current for the battery and regulate a gain of the second converter stage based on the charging current to reduce ripple in the charging current. A new configuration of transformer suitable for use with the power converter is also described.
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公开(公告)号：US10404064B2
公开(公告)日：2019-09-03
申请号：US15239165
申请日：2016-08-17
Applicant: Virginia Tech Intellectual Properties, Inc.
Inventor： Yadong Lyu , Yi-Hsun Hsieh , Fred C. Lee , Qiang Li
Abstract: Aspects of capacitor voltage ripple reduction in modular multilevel converters are described herein. In one embodiment, a power converter system includes a modular multilevel converter (MMC) electrically coupled and configured to convert power between two different power systems. The MMC includes one or more phase legs having a cascade arrangement of switching submodules, where the switching submodules include an arrangement of switching power transistors and capacitors. The MMC further includes a control loop including a differential mode control loop and a common mode control loop. The differential control loop is configured to generate a differential control signal based on a target modulation index to reduce fundamental components of voltage ripple on the capacitors, and the common mode control loop is configured to inject 2nd order harmonic current into a common mode control signal to reduce 2nd order harmonic components of the voltage ripple on the capacitors.
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Patent Agency Ranking
公开(公告)号：US10333353B2
公开(公告)日：2019-06-25
申请号：US15417353
申请日：2017-01-27
Applicant: Virginia Tech Intellectual Properties, Inc.
Inventor： Junjie Feng , Qiang Li , Fred C. Lee , Minfan Fu
Abstract: In one example, an 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 receptacle including a number of coils arranged for omnidirectional power transfer to an electronic device placed in the receptacle, and a controller configured to activate individual ones of the transmitter-side resonant tank circuits to wirelessly transmit power to the electronic device through near-field resonant inductive coupling. In one example, the receptacle can be embodied as a bowl, and 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. In other aspects, various transmitter-side and receiver-side tank circuits for coupling independent resonance and ZVS operation are described.
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公开(公告)号：US10110122B2
公开(公告)日：2018-10-23
申请号：US14674704
申请日：2015-03-31
Applicant: Virginia Tech Intellectual Properties, Inc.
Inventor： Syed Bari , Fred C. Lee , Qiang Li , Pei-Hsin Liu
Abstract: Response of a variable frequency switching constant on-time or adaptive on-time controlled power converter to a large step-up or step-down change in load is improved with a simple circuit that detects magnitude and polarity of a change in output voltage and initiates, extends or terminates conduction of power pulses from an input source through said power converter. Both the amplitude and duration of undershoot or overshoot of the transient response are reduced or, alternatively, the capacitance of an output filter may be significantly reduced and still provide comparable transient performance. The fast adaptive on-time control is applicable to multi-phase power converters using phase managers or one or more phase-locked loops for interleaving of power pulses.
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公开(公告)号：US10013007B2
公开(公告)日：2018-07-03
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
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.
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公开(公告)号：US20170054294A1
公开(公告)日：2017-02-23
申请号：US15239165
申请日：2016-08-17
Applicant: Virginia Tech Intellectual Properties, Inc.
Inventor： Yadong Lyu , Yi-Hsun Hsieh , Fred C. Lee , Qiang Li
CPC classification number: H02J3/01 , H02J5/00 , H02M1/15 , H02M2007/4835
Abstract: Aspects of capacitor voltage ripple reduction in modular multilevel converters are described herein. In one embodiment, a power converter system includes a modular multilevel converter (MMC) electrically coupled and configured to convert power between two different power systems. The MMC includes one or more phase legs having a cascade arrangement of switching submodules, where the switching submodules include an arrangement of switching power transistors and capacitors. The MMC further includes a control loop including a differential mode control loop and a common mode control loop. The differential control loop is configured to generate a differential control signal based on a target modulation index to reduce fundamental components of voltage ripple on the capacitors, and the common mode control loop is configured to inject 2nd order harmonic current into a common mode control signal to reduce 2nd order harmonic components of the voltage ripple on the capacitors.
Abstract translation: 本文描述了模块化多电平转换器中的电容器电压纹波降低的方面。 在一个实施例中，功率转换器系统包括电耦合并被配置为在两个不同电力系统之间转换功率的模块化多电平转换器（MMC）。 MMC包括一个或多个具有开关子模块的级联布置的相位支路，其中开关子模块包括开关功率晶体管和电容器的布置。 MMC还包括一个包括差分模式控制回路和共模控制回路的控制回路。 差分控制回路被配置为基于目标调制指数生成差分控制信号，以减少电容器上的电压纹波的基本分量，并且共模控制环路被配置为将二阶谐波电流注入到共模控制信号中 降低电容器上电压纹波的二阶谐波分量。
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30.发明授权High frequency integrated point-of-load power converter with embedded inductor substrate 有权具有嵌入式电感基板的高频集成式负载点功率转换器公开(公告)号：US09564264B2
公开(公告)日：2017-02-07
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
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。
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