Patents by Inventor Liwei Wang
Liwei Wang has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 9716425Abstract: A multilevel converter converting between AC and DC includes a phase arm with a number of cells between a DC pole and an AC terminal, the cells include at least one hybrid full bridge cell including a first cell connection terminal for coupling to the DC pole, a second cell connection terminal for coupling to the AC terminal, an energy storage element having a positive and a negative end, a first group of series connected semiconducting units in parallel with the energy storage element, where a junction between these forms one cell connection terminal, and a second group of series connected semiconducting units in parallel with the energy storage element and including a third semiconducting unit and a fourth semiconducting unit consisting of a number of unidirectional conducting elements including at least one unidirectional conducting element, where a junction between these forms a further cell connection terminal.Type: GrantFiled: January 21, 2013Date of Patent: July 25, 2017Assignee: ABB SCHWEIZ AGInventors: Alireza Nami, Liwei Wang
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Publication number: 20170170088Abstract: Some embodiments relate to an electronic package. The electronic package includes a first die and a second die stacked onto the first die. A first encapsulant is positioned between the first die and the second die. The first encapsulant includes a first material that covers a first volume between the first die and the second die. A second encapsulant is positioned between the first die and the second die. The second encapsulant includes a second material that covers a second volume between the first die and the second die. The first material has a higher thermal conductivity than the second material, and the second material more effectively promotes electrical connections between the first die and the second die as compared to the first material.Type: ApplicationFiled: June 17, 2015Publication date: June 15, 2017Inventors: Venmathy McMahan, Sivakumar Nagarajan, Elah Bozorg-Grayeli, Amrita Mallik, Kuang-Han Chu, Liwei Wang, Nisha Ananthakrishnan, Craig J. Weinman, Amram Eitan
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Publication number: 20170157806Abstract: Tubular casting processes, such as dip-coating, may be used to form substrates from polymeric solutions which may be used to fabricate implantable devices such as stents. The polymeric substrates may have multiple layers which retain the inherent properties of their starting materials and which are sufficiently ductile to prevent brittle fracture. Parameters such as the number of times the mandrel is immersed, the duration of time of each immersion within the solution, as well as the delay time between each immersion or the drying or curing time between dips and withdrawal rates of the mandrel from the solution may each be controlled to result in the desired mechanical characteristics. Additional post-processing may also be utilized to further increase strength of the substrate or to alter its shape.Type: ApplicationFiled: February 22, 2017Publication date: June 8, 2017Applicant: Amaranth Medical Pte.Inventors: Kamal RAMZIPOOR, Alfred N. K. CHIA, Liwei WANG
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Patent number: 9479076Abstract: It is presented a converter cell (10a; 10b) arranged to be used in a high voltage multilevel converter. The converter cell comprises: an energy storage element (16a; 16b) and a plurality of switching elements (S1, . . . , S8). The plurality of switching elements comprises at least one thyristor (S3; S8) and a plurality of transistors (S1, S2, S4; S5, S6, S7). Each one of the at least one thyristor (S3; S8) is provided in a position for a switching element in the converter cell where, during normal operation of the converter cell, the at least one thyristor is in a continuous conducting state. This reduces the power losses of the converter cell. A corresponding multilevel converter and a method are also presented.Type: GrantFiled: January 8, 2014Date of Patent: October 25, 2016Assignee: ABB SCHWEIZ AGInventors: Alireza Nami, Liwei Wang
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Publication number: 20150372612Abstract: It is presented a converter cell (10a; 10b) arranged to be used in a high voltage multilevel converter. The converter cell comprises: an energy storage element (16a; 16b) and a plurality of switching elements (S1, . . . , S8). The plurality of switching elements comprises at least one thyristor (S3; S8) and a plurality of transistors (S1, S2, S4; S5, S6, S7). Each one of the at least one thyristor (S3; S8) is provided in a position for a switching element in the converter cell where, during normal operation of the converter cell, the at least one thyristor is in a continuous conducting state. This reduces the power losses of the converter cell. A corresponding multilevel converter and a method are also presented.Type: ApplicationFiled: January 8, 2014Publication date: December 24, 2015Applicant: ABB Technology Ltd.Inventors: Alireza NAMI, Liwei WANG
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Publication number: 20150357905Abstract: A multilevel converter converting between AC and DC includes a phase arm with a number of cells between a DC pole and an AC terminal, the cells include at least one hybrid full bridge cell including a first cell connection terminal for coupling to the DC pole, a second cell connection terminal for coupling to the AC terminal, an energy storage element having a positive and a negative end, a first group of series connected semiconducting units in parallel with the energy storage element, where a junction between these forms one cell connection terminal, and a second group of series connected semiconducting units in parallel with the energy storage element and including a third semiconducting unit and a fourth semiconducting unit consisting of a number of unidirectional conducting elements including at least one unidirectional conducting element, where a junction between these forms a further cell connection terminal.Type: ApplicationFiled: January 21, 2013Publication date: December 10, 2015Applicant: ABB TECHNOLOGY LTDInventors: Alireza NAMI, Liwei WANG
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Patent number: 9099268Abstract: A mechanical switch in the form of a bypass switch assembly is arranged between two electrical conductors (busbars) and stays open during normal operation. When a cell fault happens, the fault and bypass information is transmitted to an actuator (acting as a trigger circuit) which activates inter alia a gas generator producing huge volume of gas in a very short time. The gas pressure pushes a movable member to bridge the two electrical conductors with ultrafast speed.Type: GrantFiled: June 13, 2012Date of Patent: August 4, 2015Assignee: ABB TECHNOLOGY LTDInventors: Åke Öberg, Filippo Chimento, Jian Qin, Liwei Wang, Ola Jeppsson
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Publication number: 20150108091Abstract: A mechanical switch in the form of a bypass switch assembly is arranged between two electrical conductors (busbars) and stays open during normal operation. When a cell fault happens, the fault and bypass information is transmitted to an actuator (acting as a trigger circuit) which activates inter alia a gas generator producing huge volume of gas in a very short time. The gas pressure pushes a movable member to bridge the two electrical conductors with ultrafast speed.Type: ApplicationFiled: June 13, 2012Publication date: April 23, 2015Applicant: ABB TECHNOLOGY LTDInventors: Åke Öberg, Filippo Chimento, Jian Qin, Liwei Wang, Ola Jeppsson
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Patent number: 8823307Abstract: A system, method and computer program product for monitoring including detecting internal faults especially inter-turn faults of a synchronous generator and thus protecting the synchronous generator. The synchronous generator includes a winding for each phase of a power network, a terminal for each phase arranged on a terminal side of the synchronous generator, and connected to the respective winding, the terminals on the terminal side are connected to an electrical power network, and the synchronous generator is arranged to input power to the electrical power network by means of the terminals.Type: GrantFiled: January 3, 2014Date of Patent: September 2, 2014Assignee: ABB Research Ltd.Inventors: Zoran Gajic, Mustafa Ibrahim, Antonis Marinopoulos, Pedro Rodriguez, Jianping Wang, Liwei Wang
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Publication number: 20140236285Abstract: Tubular casting processes, such as dip-coating, may be used to form substrates from polymeric solutions which may be used to fabricate implantable devices such as stents. The polymeric substrates may have multiple layers which retain the inherent properties of their starting materials and which are sufficiently ductile to prevent brittle fracture. Parameters such as the number of times the mandrel is immersed, the duration of time of each immersion within the solution, as well as the delay time between each immersion or the drying or curing time between dips and withdrawal rates of the mandrel from the solution may each be controlled to result in the desired mechanical characteristics. Additional post-processing may also be utilized to further increase strength of the substrate or to alter its shape.Type: ApplicationFiled: April 23, 2014Publication date: August 21, 2014Applicant: AMARANTH MEDICAL PTE.Inventors: Kamal RAMZIPOOR, Alfred N. K. CHIA, Liwei WANG
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Publication number: 20140117912Abstract: A system, method and computer program product for monitoring including detecting internal faults especially inter-turn faults of a synchronous generator and thus protecting the synchronous generator. The synchronous generator includes a winding for each phase of a power network, a terminal for each phase arranged on a terminal side of the synchronous generator, and connected to the respective winding, the terminals on the terminal side are connected to an electrical power network, and the synchronous generator is arranged to input power to the electrical power network by means of the terminals.Type: ApplicationFiled: January 3, 2014Publication date: May 1, 2014Inventors: Zoran Gajic, Mustafa Ibrahim, Antonis Marinopoulos, Pedro Rodriguez, Jianping Wang, Liwei Wang
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Publication number: 20140039600Abstract: Tubular casting processes, such as dip-coating, may be used to form substrates from polymeric solutions which may be used to fabricate implantable devices such as stents. The polymeric substrates may have multiple layers which retain the inherent properties of their starting materials and which are sufficiently ductile to prevent brittle fracture. Parameters such as the number of times the mandrel is immersed, the duration of time of each immersion within the solution, as well as the delay time between each immersion or the drying or curing time between dips and withdrawal rates of the mandrel from the solution may each be controlled to result in the desired mechanical characteristics. Additional post-processing may also be utilized to further increase strength of the substrate or to alter its shape.Type: ApplicationFiled: September 18, 2013Publication date: February 6, 2014Applicant: AMARANTH MEDICAL PTE.Inventors: Kamal RAMZIPOOR, Alfred N. K. CHIA, Liwei WANG
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Publication number: 20140035192Abstract: Tubular casting processes, such as dip-coating, may be used to form substrates from polymeric solutions which may be used to fabricate implantable devices such as stents. The polymeric substrates may have multiple layers which retain the inherent properties of their starting materials and which are sufficiently ductile to prevent brittle fracture. Parameters such as the number of times the mandrel is immersed, the duration of time of each immersion within the solution, as well as the delay time between each immersion or the drying or curing time between dips and withdrawal rates of the mandrel from the solution may each be controlled to result in the desired mechanical characteristics. Additional post-processing may also be utilized to further increase strength of the substrate or to alter its shape.Type: ApplicationFiled: September 18, 2013Publication date: February 6, 2014Applicant: AMARANTH MEDICAL PTE.Inventors: Kamal RAMZIPOOR, Alfred N. K. CHIA, Liwei WANG
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Patent number: 8423521Abstract: A method and an apparatus for storing document data in a docbase management system are provided. In the method, document data is described by using a tree structure, the document data is split into multiple data fragments based on the tree structure when the document data is being stored, and the data fragments are stored, and the relation of the data fragments is recorded, wherein, each data fragment corresponds to a subtree or a node in the tree structure.Type: GrantFiled: February 8, 2010Date of Patent: April 16, 2013Assignee: Sursen Corp.Inventors: Donglin Wang, Haifeng Jiang, Ningsheng Liu, Liwei Wang
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Publication number: 20120232644Abstract: Tubular casting processes, such as dip-coating, may be used to form substrates from polymeric solutions which may be used to fabricate implantable devices such as stents. The polymeric substrates may have multiple layers which retain the inherent properties of their starting materials and which are sufficiently ductile to prevent brittle fracture. Parameters such as the number of times the mandrel is immersed, the duration of time of each immersion within the solution, as well as the delay time between each immersion or the drying or curing time between dips and withdrawal rates of the mandrel from the solution may each be controlled to result in the desired mechanical characteristics. Additional post-processing may also be utilized to further increase strength of the substrate or to alter its shape.Type: ApplicationFiled: May 21, 2012Publication date: September 13, 2012Inventors: Kamal RAMZIPOOR, Alfred N. K. CHIA, Liwei WANG, Chang Yeul LEE
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Publication number: 20120232643Abstract: Tubular casting processes, such as dip-coating, may be used to form substrates from polymeric solutions which may be used to fabricate implantable devices such as stents. The polymeric substrates may have multiple layers which retain the inherent properties of their starting materials and which are sufficiently ductile to prevent brittle fracture. Parameters such as the number of times the mandrel is immersed, the duration of time of each immersion within the solution, as well as the delay time between each immersion or the drying or curing time between dips and withdrawal rates of the mandrel from the solution may each be controlled to result in the desired mechanical characteristics. Additional post-processing may also be utilized to further increase strength of the substrate or to alter its shape.Type: ApplicationFiled: May 21, 2012Publication date: September 13, 2012Applicant: AMARANTH MEDICAL PTE.Inventors: Kamal RAMZIPOOR, Alfred N. K. CHIA, Liwei WANG
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Patent number: 8206636Abstract: Tubular casting processes, such as dip-coating, may be used to form substrates from polymeric solutions which may be used to fabricate implantable devices such as stents. The polymeric substrates may have multiple layers which retain the inherent properties of their starting materials and which are sufficiently ductile to prevent brittle fracture. Parameters such as the number of times the mandrel is immersed, the duration of time of each immersion within the solution, as well as the delay time between each immersion or the drying or curing time between dips and withdrawal rates of the mandrel from the solution may each be controlled to result in the desired mechanical characteristics. Additional post-processing may also be utilized to further increase strength of the substrate or to alter its shape.Type: GrantFiled: June 19, 2009Date of Patent: June 26, 2012Assignee: Amaranth Medical Pte.Inventors: Kamal Ramzipoor, Alfred N. K. Chia, Liwei Wang, Chang Y. Lee
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Patent number: 8206635Abstract: Tubular casting processes, such as dip-coating, may be used to form substrates from polymeric solutions which may be used to fabricate implantable devices such as stents. The polymeric substrates may have multiple layers which retain the inherent properties of their starting materials and which are sufficiently ductile to prevent brittle fracture. Parameters such as the number of times the mandrel is immersed, the duration of time of each immersion within the solution, as well as the delay time between each immersion or the drying or curing time between dips and withdrawal rates of the mandrel from the solution may each be controlled to result in the desired mechanical characteristics. Additional post-processing may also be utilized to further increase strength of the substrate or to alter its shape.Type: GrantFiled: June 20, 2008Date of Patent: June 26, 2012Assignee: Amaranth Medical Pte.Inventors: Kamal Ramzipoor, Alfred N. K. Chia, Liwei Wang
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Patent number: 7962176Abstract: The present invention discloses a base station system, including an indoor part and a remote RF subsystem (RRS). The indoor part includes a RIU, a CCU, a BBU, a GPSU and a local interface unit. The RRS includes a remote interface unit, a RF transceiver unit (TRU) and an antenna. The local interface unit and the remote interface unit are for signal intercommunicating between the indoor part of the base station and the RSS. The TRU is a RF transceiver module of the conventional RFU, for amplifying an analog RF signal from the remote interface unit and transmitting the signal to the antenna. By flexibly selecting between an optical cable and an If cable, the interface unit of the present invention provides a digital baseband remote manner and an IF remote manner.Type: GrantFiled: December 29, 2005Date of Patent: June 14, 2011Assignee: China Academy of Telecommunications TechnologyInventors: Shihe Li, Tiezhu Xu, Hongbo Wang, Liwei Wang, Xiaozhou Chen, Xian Liu, Guoxin Zhao, Jianfeng Wu
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Publication number: 20100146005Abstract: The present invention discloses method and apparatus for storing document data in a docbase management system. The method includes: describing document data by using a tree structure; splitting the document data into multiple data fragments based on the tree structure when storing the document data; and storing the data fragments, and recording the relation of the data fragments, wherein, each data fragment correspond to a subtree or a node in the tree structure.Type: ApplicationFiled: February 8, 2010Publication date: June 10, 2010Inventors: Donglin Wang, Haifeng Jiang, Ningsheng Liu, Liwei Wang