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公开(公告)号：US20250087410A1
公开(公告)日：2025-03-13
申请号：US18462723
申请日：2023-09-07
Applicant: VIRGINIA TECH INTELLECTUAL PROPERTIES, INC.
Inventor： Feng Jin , Ahmed Nabih , Qiang Li
Abstract: Power converters with integrated transformers and resonant inductors are described. An example integrated transformer can be electrically coupled between a primary-side converter stage and a secondary-side converter stage in a power converter. The integrated transformer can include a magnetic core with plurality of core legs, a primary winding extending around each of the plurality of core legs, and a secondary winding extending around each of the plurality of core legs. A winding direction of the primary winding is alternated between adjacent core legs among the plurality of core legs, and a winding direction of the secondary winding is alternated between adjacent core legs among the plurality of core legs. Additionally, a number of winding turns of the primary winding and a number of winding turns of the secondary winding on a first core leg is different than on a second core leg among the plurality of core legs.
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公开(公告)号：US20240204652A1
公开(公告)日：2024-06-20
申请号：US18068144
申请日：2022-12-19
Applicant: VIRGINIA TECH INTELLECTUAL PROPERTIES, INC.
Inventor： Adhistira Madhyasta Naradhipa , Qiang Li
CPC classification number: H02M1/14 , H02M3/1584
Abstract: Aspects of a transient control scheme for a multiphase power converter are described. In one example, a power converter system includes a multiphase power converter that includes a plurality of converter phases, with each converter phase comprising a switching transistor and an inductor coupled between an input power source and a load. The power converter system also includes a controller configured to distribute an on-time signal to each converter phase during operation of the multiphase power converter. The controller includes circuitry configured to enable an on-time signal phase overlap between non-subsequent phases of the multiphase power converter when a load current increase is detected during a transient state of the multiphase power converter. The on-time signal phase overlap refers to a simultaneous on-state of two or more switching transistors of the non-subsequent phases during a duration of time within the transient state.
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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
Applicant: Virginia Tech Intellectual Properties, Inc.
Inventor： Syed Bari , Fred C. Lee , Qiang Li
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.
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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
Applicant: Virginia Tech Intellectual Properties, Inc.
Inventor： Owen Jong , Qiang Li , Fred C. Lee
Abstract: 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
Applicant: Virginia Tech Intellectual Properties, Inc.
Inventor： Owen Jong , Qiang Li , Fred C. Lee
IPC: H02M3/07
Abstract: 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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Patent Agency Ranking
6.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
Applicant: Virginia Tech Intellectual Properties, Inc.
Inventor： Zhengrong Huang , Zhengyang Liu , Fred C. Lee , Qiang Li , Furong Xiao
Abstract: 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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公开(公告)号：US10217559B2
公开(公告)日：2019-02-26
申请号：US15484641
申请日：2017-04-11
Applicant: Virginia Tech Intellectual Properties, Inc.
Inventor： Yuchen Yang , Mingkai Mu , Fred C. Lee , Qiang Li
Abstract: A power factor correction (PFC) power converter, particularly of a multiphase totem-pole or other topology presenting a switching bridge that can potentially provide bi-directional power transfer control, reduces a nominal switching frequency and achieves zero voltage switching over an increased portion of a half line cycle by providing positive or inverse coupling of inductors in an inductor structure that can be formed of a multi-layer printed circuit board such that at least three different inductances are presented during each half line cycle period; allowing increased switching frequency and simplifying EMI filtering arrangements. Parasitic capacitances can be balanced with additional coupled windings to reduce differential mode and common mode noise. The PFC power converter is particularly applicable to provide bi-directional power control from an on-board battery charger in an electrically powered vehicle.
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8.发明申请公开(公告)号：US20180205306A1
公开(公告)日：2018-07-19
申请号：US15868486
申请日：2018-01-11
Applicant: Virginia Tech Intellectual Properties, Inc.
Inventor： Zhengrong Huang , Zhengyang Liu , Fred C. Lee , Qiang Li , Furong Xiao
CPC classification number: H02M1/083 , H02M1/126 , H02M7/219 , H02M7/797 , H02M2001/0058 , Y02B70/1491
Abstract: 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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公开(公告)号：US20180076723A1
公开(公告)日：2018-03-15
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: H02M3/335 , H02M1/088 , H02M1/42 , H02J7/04 , H02J7/00 , H02M1/14 , H01F27/24 , H01F27/28 , H01F27/34
CPC classification number: H02M3/33569 , H01F27/24 , H01F27/28 , H01F27/346 , H01F2027/2819 , H02J7/0063 , H02J7/022 , H02J7/04 , H02J2007/0067 , H02M1/088 , H02M1/14 , H02M1/4208 , H02M3/3378 , H02M2001/0048 , H02M2001/007 , Y02B40/90 , Y02B70/126 , Y02B70/1491
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：US09544956B2
公开(公告)日：2017-01-10
申请号：US14628372
申请日：2015-02-23
Applicant: Virginia Tech Intellectual Properties, Inc.
Inventor： Xuebing Chen , Daocheng Huang , Qiang Li , Fred C. Lee
IPC: H05B33/08
CPC classification number: H05B33/0815 , H05B33/0851
Abstract: In a two-stage power converter providing voltage regulation in a first stage, zero voltage switching (ZVS) is provided in switches in an unregulated, constant frequency second stage of a two-stage power converter by an inductor of a CLL resonant circuit connected in parallel with both a series connection of an external inductor and a primary winding of one or more transformers connected in series and an output of the switching circuit so that the output capacitances of the switches can be charged and discharged, respectively, by current in the parallel-connected inductor and independently of current in the magnetizing inductance of the transformer. Therefore, the magnetizing inductance of the transformer can be made sufficiently large to balance currents delivered to respective loads as is particularly desirable for driving a plurality of unbalanced LED strings independently of the value of the parallel-connected inductor which is desirably small.
Abstract translation: 在第一级提供电压调节的两级电力转换器中，通过CLL谐振电路的电感器连接在两级功率转换器的未调节恒定频率第二级的开关中提供零电压开关（ZVS） 与串联连接的一个或多个变压器的外部电感器和初级绕组的串联连接和开关电路的输出两者并联，使得开关的输出电容可以分别由并联的电流充电和放电 并且独立于变压器励磁电感中的电流。 因此，可以使变压器的磁化电感足够大以平衡输送到各个负载的电流，这是特别适合于驱动多个不平衡LED串，独立于期望较小的并联电感器的值。
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