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公开(公告)号：US20220310303A1
公开(公告)日：2022-09-29
申请号：US17211975
申请日：2021-03-25
发明人： Shuo Wang , Fred C. Lee , Qiang Li
摘要： 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.
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公开(公告)号：US10910140B2
公开(公告)日：2021-02-02
申请号：US15656198
申请日：2017-07-21
发明人： Chao Fei , Fred C. Lee , Qiang Li
IPC分类号： H01F17/04 , H01F27/245 , H01F27/28 , H02M3/335 , H01F27/30 , H02M3/28 , H02M3/337 , H01F27/38 , H01F38/00
摘要： 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.
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公开(公告)号：US10790081B2
公开(公告)日：2020-09-29
申请号：US16252990
申请日：2019-01-21
发明人： Chao Fei , Bin Li , Fred C. Lee , Qiang Li , Hongfei Wu
IPC分类号： H01F27/28 , H01F27/24 , H01F27/06 , H02M1/15 , H02M3/335 , H02M3/158 , H02M7/5387 , H01F27/36
摘要： 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：US10312805B2
公开(公告)日：2019-06-04
申请号：US15075553
申请日：2016-03-21
发明人： Virginia Li , Pei-Hsin Liu , Qiang Li , Fred C. Lee
IPC分类号： H02M3/156
摘要： 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.
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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
发明人： Syed Bari , Fred C. Lee , Qiang Li
IPC分类号： H02M3/04
CPC分类号： H02M3/156 , H02M2003/1566
摘要： 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.
摘要翻译： 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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6.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
发明人： Yipeng Su , Dongbin Hou , Fred C. Lee , Qiang Li
CPC分类号： H01F1/14 , H01F3/14 , H01F17/0033 , H01F2017/002 , H02M3/155 , H05K1/0233 , H05K1/0373 , H05K1/165 , H05K2201/0209 , H05K2201/0245 , H05K2201/086 , H05K2201/10015
摘要： 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.
摘要翻译： 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：US10673328B2
公开(公告)日：2020-06-02
申请号：US15089744
申请日：2016-04-04
发明人： Syed Bari , Fred C. Lee , Qiang Li
摘要： 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.
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公开(公告)号：US10658928B2
公开(公告)日：2020-05-19
申请号：US16372101
申请日：2019-04-01
发明人： Owen Jong , Qiang Li , Fred C. Lee
摘要： Various examples are provided related to switched-capacitor converters (SCCs) with multi resonant frequencies. In one example, a multi resonant SCC (MRSCC) includes a series of switches coupled between an input voltage and an output connection; a pair of diodes coupled across the output connection; and a resonant circuit coupled at a first end between first and second switches of the series of switches and at a second end between the pair of diodes. The resonant circuit can comprise a resonant tank including a first capacitor and a resonant inductor, and a resonant component in parallel with at least a portion of the resonant tank. The resonant component can be connected across the resonant tank or across the resonant inductor. The MRSCC topology can also be used with higher voltage conversion ratio converters.
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公开(公告)号：US20190334434A1
公开(公告)日：2019-10-31
申请号：US16372101
申请日：2019-04-01
发明人： Owen Jong , Qiang Li , Fred C. Lee
IPC分类号： H02M3/07
摘要： Various examples are provided related to switched-capacitor converters (SCCs) with multi resonant frequencies. In one example, a multi resonant SCC (MRSCC) includes a series of switches coupled between an input voltage and an output connection; a pair of diodes coupled across the output connection; and a resonant circuit coupled at a first end between first and second switches of the series of switches and at a second end between the pair of diodes. The resonant circuit can comprise a resonant tank including a first capacitor and a resonant inductor, and a resonant component in parallel with at least a portion of the resonant tank. The resonant component can be connected across the resonant tank or across the resonant inductor. The MRSCC topology can also be used with higher voltage conversion ratio converters.
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10.发明授权公开(公告)号：US10291109B2
公开(公告)日：2019-05-14
申请号：US15868486
申请日：2018-01-11
发明人： Zhengrong Huang , Zhengyang Liu , Fred C. Lee , Qiang Li , Furong Xiao
摘要： Critical-mode soft-switching techniques for a power converter are described. In one example, a power converter includes a converter electrically coupled between an alternating current (AC) power system and a direct current (DC) power system, where the converter includes a number of phase legs. The power converter can also include a control system configured, during a portion of a whole line cycle of the AC power system, to clamp a first phase leg of the converter from switching and operate second and third phase legs of the converter independently in either critical conduction mode (CRM) or in discontinuous conduction mode (DCM).
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