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公开(公告)号：US20220029457A1
公开(公告)日：2022-01-27
申请号：US17331057
申请日：2021-05-26
Applicant: Drexel University
Abstract: A dynamic capacitive power transfer system for an elevator that can realize the real-time powering of the elevator when it is in the moving status. It includes a metal track along the building side as the power transmitter and a piece of metal at the elevator side as the power receiver. There is a gap between the transmitter and receiver, and up to kW power can be transferred wirelessly and efficiently to serve the air conditioner, lightning, and other electronic devices in the moving car. The steel wheels and ropes may be used to connect the moving car to the earth ground, which contributes to form the current returning loop. It eliminates the electric cables and the corresponding flexible cable carrier system for the linear movement.
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公开(公告)号：US20240109447A1
公开(公告)日：2024-04-04
申请号：US18479878
申请日：2023-10-03
Applicant: Drexel University
Inventor： Fei Lu , Hua Zhang , Yao Wang , Shuyan Zhao , Reza Kheirollahi
CPC classification number: B60L53/51 , B60L53/305 , B60L53/53 , B60L53/62
Abstract: An integrated portable extremely fast charger (XFC) may be installed for heavy-duty off-road vehicles, such as tractors and combine harvesters. The XFC shortens the charging period of plug-in hybrid electric vehicles (PHEVs) and battery electric vehicles (BEVs) by providing >500 kW in a single charger. The proposed XFC integrates a solar farm and local energy storage system (ESS) such that the local grid only needs to provide the power gap between the vehicle battery and the local ESS during charging events, yielding a low-cost XFC installation and higher renewable energy penetration. Two design approaches for the XFC, conductive and wireless, are based on multiphase interleaved dc-dc converter circuit, permitting flexible access to electricity. Smart fault protection mechanism is also proposed to achieve high safety during charging events. The hexagonal prism charger may be integrated into the power electronic devices with a transformer, yielding a high compactness and power density.
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公开(公告)号：US11870269B2
公开(公告)日：2024-01-09
申请号：US17331057
申请日：2021-05-26
Applicant: Drexel University
CPC classification number: H02J50/05 , B60L9/00 , B66B11/0226 , H02J50/005
Abstract: A dynamic capacitive power transfer system for an elevator that can realize the real-time powering of the elevator when it is in the moving status. It includes a metal track along the building side as the power transmitter and a piece of metal at the elevator side as the power receiver. There is a gap between the transmitter and receiver, and up to kW power can be transferred wirelessly and efficiently to serve the air conditioner, lightning, and other electronic devices in the moving car. The steel wheels and ropes may be used to connect the moving car to the earth ground, which contributes to form the current returning loop. It eliminates the electric cables and the corresponding flexible cable carrier system for the linear movement.
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4.发明公开公开(公告)号：US20240333277A1
公开(公告)日：2024-10-03
申请号：US18574128
申请日：2022-06-24
Applicant: Drexel University
Inventor： Fei Lu , Hua Zhang , Reza Kheirollahi
IPC: H03K17/0812 , H02H3/087
CPC classification number: H03K17/08122 , H02H3/087
Abstract: Solid-state circuit breakers (SSCBs) have been witnessing an impressive progress with the aid of wide bandgap (WBG) devices such as silicon carbide (SiC) MOSFETs. Along with obtaining high efficiency as the result of low on-state resistance, response times have been gaining remarkable achievements in microseconds range. Not only that, the reported successes in control and gate drivers design and incorporating fault detection/location techniques in SSCBs are promising. A MOV-resistive capacitive switch (MOV-RCS) snubber for solid state circuit breakers addresses the following: 1) the MOV degradation issue in DCCBs is solved, 2) the maximum allowable DC bus voltage on DCCBs is extended. The solid state circuit breaker and an active clamping snubber includes a first circuit including a fault current bypass based solid state breaker for low voltage direct current systems.
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Patent Agency Ranking
公开(公告)号：US20240146104A1
公开(公告)日：2024-05-02
申请号：US18406110
申请日：2024-01-06
Applicant: Drexel University
CPC classification number: H02J50/05 , B60L9/00 , B66B11/0226 , H02J50/005
Abstract: A dynamic capacitive power transfer system for an elevator that can realize the real-time powering of the elevator when it is in the moving status. It includes a metal track along the building side as the power transmitter and a piece of metal at the elevator side as the power receiver. There is a gap between the transmitter and receiver, and up to kW power can be transferred wirelessly and efficiently to serve the air conditioner, lightning, and other electronic devices in the moving car. The steel wheels and ropes may be used to connect the moving car to the earth ground, which contributes to form the current returning loop. It eliminates the electric cables and the corresponding flexible cable carrier system for the linear movement.
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6.发明授权公开(公告)号：US12160096B2
公开(公告)日：2024-12-03
申请号：US17996088
申请日：2021-04-13
Applicant: Drexel University
Inventor： Fei Lu , Hua Zhang , Reza Kheirollahi , Yao Wang , Shuyan Zhao
Abstract: With the fasting growth of renewable energy resources and DC supplied loads, DC electrical systems have been increasingly received attentions all over the world. DC breaker systems play a key role in protection systems for disconnecting sources and loads, and they are also used mainly for removing faulted sections from the system accurately and reliably. Solid state DC breakers benefit from fast response time and compactness features; however, due to the lack of zero current realization and high-power losses, the reliability and efficiency of these devices is low. The system proposes a solid-state DC breaker for medium voltage DC (MVDC) systems. The presented structure have two main parts: 1) a main conduction branch including stacked MV Silicon-Carbide (SiC) devices to improve the efficiency and provide a fast response time, 2) a breaker branch including a wireless capacitive coupling to avoid metal-to-metal contact and increase the overall reliability, and also a modular current pulse power supply to realize zero-current switching.
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7.发明公开公开(公告)号：US20230187923A1
公开(公告)日：2023-06-15
申请号：US17996088
申请日：2021-04-13
Applicant: Drexel University
Inventor： Fei Lu , Hua Zhang , Reza Kheirollahi , Yao Wang , Shuyan Zhao
Abstract: With the fasting growth of renewable energy resources and DC supplied loads, DC electrical systems have been increasingly received attentions all over the world. DC breaker systems play a key role in protection systems for disconnecting sources and loads, and they are also used mainly for removing faulted sections from the system accurately and reliably. Solid state DC breakers benefit from fast response time and compactness features; however, due to the lack of zero current realization and high-power losses, the reliability and efficiency of these devices is low. The system proposes a solid-state DC breaker for medium voltage DC (MVDC) systems. The presented structure have two main parts: 1) a main conduction branch including stacked MV Silicon-Carbide (SiC) devices to improve the efficiency and provide a fast response time, 2) a breaker branch including a wireless capacitive coupling to avoid metal-to-metal contact and increase the overall reliability, and also a modular current pulse power supply to realize zero-current switching.
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8.发明公开公开(公告)号：US20230170901A1
公开(公告)日：2023-06-01
申请号：US18058440
申请日：2022-11-23
Applicant: Drexel University
Inventor： Fei Lu , Hua Zhang , Reza Kheirollahi
IPC: H03K17/73
CPC classification number: H03K17/73
Abstract: A thyristor-based dc solid state circuit breaker (SSCB) named Y-type includes a new complementary commutation circuit including a capacitor-capacitor pair, which features three advantages. First, a fast commutation is achieved using a countercurrent pulse injection by the capacitor-capacitor pair structure. Second, metal-oxide varistors (MOVs) are disconnected from the power line when SSCB is OFF, which solves the reliability issue due to the MOV degradation and enhances the voltage utilization rate of the main switch. Third, benefiting from the capacitor-capacitor pair structure, reliable reclosing and rebreaking are obtained for practical applications.
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9.发明公开公开(公告)号：US20230163587A1
公开(公告)日：2023-05-25
申请号：US18058447
申请日：2022-11-23
Applicant: Drexel University
Inventor： Fei Lu , Hua Zhang , Reza Kheirollahi
IPC: H02H3/087 , H01H9/16 , H01C7/108 , H01H9/54 , H03K17/687
CPC classification number: H02H3/087 , H01H9/16 , H01C7/108 , H01H9/542 , H03K17/687 , H01H2009/543
Abstract: There may be two active snubbers for direct current (dc) solid-state circuit breakers (SSCBs): metal-oxide-varistor with resistor-capacitor-switch (MOV-RCS) and active-MOV with resistor-capacitor-diode (AMOV-RCD). In the snubber branch, either half- or full-controlled switch can be used, leading to four topologies. The improved snubbers offer several improvements: 1) MOV is disconnected from the power line during SSCB OFF-state, which enhances reliability as neither voltage nor power appears on MOV; 2) voltage utilization rate ηv of the main switch is remarkably increased, which improves efficiency and power density, and reduces design cost shows experiments of five prototypes are conducted including four proposed snubbers and a comparison with conventional MOV-RCD snubber.
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