Patents by Inventor Feifei Zhao
Feifei Zhao 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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Publication number: 20240068936Abstract: An adaptive characteristic spectral line screening method and system based on atomic emission spectrum are provided, the method includes: using a set characteristic screening optimization method to perform a plurality of optimization rounds of characteristic screening, obtaining an initialized spectral dataset of each round of the characteristic screening and initialized characteristic population genes; obtaining an optimal characteristic population gene of each round by a set analysis method, a fitness function, and an iteration of a genetic algorithm; obtaining an optimized characteristic spectral information set when the plurality of optimization rounds reach set optimization rounds; performing combination statistics and discriminant analyses on the optimized characteristic spectral information set to complete an adaptive characteristic spectral line screening.Type: ApplicationFiled: October 10, 2022Publication date: February 29, 2024Inventors: Jia Liu, Feipeng Cui, Xiaopeng Li, Ling Liu, Hongwei Shi, Feifei Guo, Ying Zhao, Xuejing Shen, Haizhou Wang
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Publication number: 20230352257Abstract: The present invention relates to a relay protective device, a construction machine, a relay protection control method and apparatus, and a computer readable storage medium.Type: ApplicationFiled: February 7, 2021Publication date: November 2, 2023Applicant: XUZHOU XCMG EXCAVATOR MACHINERY CO., LTDInventors: Yadong LI, Jiawen GENG, Jian ZHANG, Bujun DONG, Yuzhong DONG, Fanjian MENG, Feifei ZHAO, Meng WEN
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Patent number: 11616369Abstract: Provided is a control method for a parallel MMC unit of a LCC-MMC hybrid cascade converter station. The control strategy includes: 1) numbering all MMC units connected in parallel in a MMC valve manifold; (2) for a MMC unit using a constant direct-current voltage control manner, calculating a direct-current instruction value of the MMC unit according to a direct-current measurement value; (3) for a MMC unit using a constant active power control manner, calculating an active power instruction value of the MMC unit according to the rated capacity of the MMC unit and a direct-current instruction value of a system rectifier station; (4) for the MMC unit using the constant direct-current voltage control manner, correcting a direct-current voltage instruction value of the MMC unit by using the direct-current instruction value and the direct-current measurement value, and controlling the MMC unit according to the corrected direct-current voltage instruction value.Type: GrantFiled: October 1, 2020Date of Patent: March 28, 2023Assignees: STATE GRID JIANGSU ELECTRIC POWER CO., LTD., STATE GRID JIANGSU ELECTRIC POWER CO., LTD. ECONOMIC RESEARCH INSTITUTE, STATE GRID JIANGSU ELECTRIC POWER DESIGN CONSULTING INSTITUTE CO., LTD., STATE GRID CORPORATION OF CHINA, STATE GRID JIANGSU ELECTRIC POWER CO., LTD. MARKETING CENTERInventors: Hui Cai, Zhenjian Xie, Zhuyi Peng, Feifei Zhao, Xingning Han, Caixuan Xu, Chengchen Huang, Zheng Xu, Ming Yan, Zheren Zhang, Wanchun Qi, Wenjia Zhang, Wentao Sun, Chen Li, Quanquan Wang, Boliang Liu
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Publication number: 20220397879Abstract: A method for evaluating resonance stability of a flexible direct current (DC) transmission system in an offshore wind farm includes: establishing an s-domain equivalent circuit of a flexible DC transmission system in an offshore wind farm, constructing an s-domain node admittance matrix of the flexible DC transmission system in the offshore wind farm, determining a resonant mode of the system based on a zero root of a determinant of the node admittance matrix, and determining stability of the system. In the method, an s-domain impedance model is used to describe dynamic characteristics of a wind turbine, a flexible DC converter, and other power devices, avoiding coupling between device modeling and an operation mode of the system. In addition, the node admittance matrix is used for analysis so as to fully consider a plurality of power electronic devices and a grid structure of the offshore wind farm, realizing comprehensive analysis.Type: ApplicationFiled: August 23, 2021Publication date: December 15, 2022Inventors: Hui Cai, Wenjia Zhang, Zhuyi Peng, Sixuan Xu, Feifei Zhao, Facai Xing, Chengchen Huang, Zhenjian Xie, Wanchun Qi, Wentao Sun, Zheng Xu
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Patent number: 11440170Abstract: The present application discloses an apparatus for mounting an O-ring to a work piece, which includes a body including a plurality of connecting holes for connecting a pressure source to the body; an annular groove formed on the body and adapted to receive the O-ring; and a plurality of air channels formed in the body, the plurality of air channels being in fluid communication with the annular groove and the plurality of connecting holes to provide negative pressure with the pressure source in the annular groove to suck the O-ring in the annular groove, the annular groove is coaxial with a groove formed on a surface of the work piece during the mounting so that the O-ring is dropped into the groove when the pressure source is disconnected from the body or provides positive pressure to the plurality of air channels.Type: GrantFiled: August 12, 2020Date of Patent: September 13, 2022Assignee: ABB SCHWEIZ AGInventors: Cheng Li, Feifei Zhao, Yichao Mao
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Publication number: 20220132691Abstract: An electronic device includes: a first display, a transmission assembly, and at least two second displays. The first display includes a first surface and a second surface opposite to the first surface. The at least two second displays are connected to the transmission assembly. The transmission assembly drives the at least two second displays to move between first positions and second positions. When the at least two second displays are located at the first positions, at least part of each of the least two second displays is covered by a orthographic projection of the first display along a perpendicular direction of the second surface. When the at least two second displays are located at the second positions, at least two second displays are located on an periphery of the first display and abut against an outer peripheral wall of the first display.Type: ApplicationFiled: January 11, 2022Publication date: April 28, 2022Applicant: VIVO MOBILE COMMUNICATION CO.,LTD.Inventors: Feifei ZHAO, Rongfei SU
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Patent number: 11285592Abstract: An apparatus for mounting an O-ring to a work piece, including: a plurality of picking components operable to move away from each other to contact and expand the O-ring to pick the O-ring or to move towards each other to release the O-ring; and a guiding component including a frustum portion arranged coaxially with a groove of the work piece, a large end face of the frustum portion arranged adjacent to an end surface of the work piece on which the groove is formed, wherein a diameter of the large end face is substantially same as an inner diameter of the groove, wherein the picking components are operable to release the O-ring onto a tapered surface of the frustum portion so that the O-ring is pushed into the groove along the tapered surface.Type: GrantFiled: August 12, 2020Date of Patent: March 29, 2022Assignee: ABB Schweiz AGInventors: Cheng Li, Feifei Zhao, Weijie Yan
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Publication number: 20210143754Abstract: Provided is a control method for a parallel MMC unit of a LCC-MMC hybrid cascade converter station. The control strategy includes: 1) numbering all MMC units connected in parallel in a MMC valve manifold; (2) for a MMC unit using a constant direct-current voltage control manner, calculating a direct-current instruction value of the MMC unit according to a direct-current measurement value; (3) for a MMC unit using a constant active power control manner, calculating an active power instruction value of the MMC unit according to the rated capacity of the MMC unit and a direct-current instruction value of a system rectifier station; (4) for the MMC unit using the constant direct-current voltage control manner, correcting a direct-current voltage instruction value of the MMC unit by using the direct-current instruction value and the direct-current measurement value, and controlling the MMC unit according to the corrected direct-current voltage instruction value.Type: ApplicationFiled: October 1, 2020Publication date: May 13, 2021Inventors: Hui CAI, Zhenjian XIE, Zhuyi PENG, Feifei ZHAO, Xingning HAN, Caixuan XU, Chengchen HUANG, Zheng XU, Ming YAN, Zheren ZHANG, Wanchun QI, Wenjia ZHANG, Wentao SUN, Chen LI, Quanquan WANG, Boliang LIU
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Publication number: 20200368886Abstract: The present application discloses an apparatus for mounting an O-ring to a work piece, which includes a body including a plurality of connecting holes for connecting a pressure source to the body; an annular groove formed on the body and adapted to receive the O-ring; and a plurality of air channels formed in the body, the plurality of air channels being in fluid communication with the annular groove and the plurality of connecting holes to provide negative pressure with the pressure source in the annular groove to suck the O-ring in the annular groove, the annular groove is coaxial with a groove formed on a surface of the work piece during the mounting so that the O-ring is dropped into the groove when the pressure source is disconnected from the body or provides positive pressure to the plurality of air channels.Type: ApplicationFiled: August 12, 2020Publication date: November 26, 2020Inventors: Cheng Li, Feifei Zhao, Yichao Mao
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Publication number: 20200368888Abstract: An apparatus for mounting an O-ring to a work piece, including: a plurality of picking components operable to move away from each other to contact and expand the O-ring to pick the O-ring or to move towards each other to release the O-ring; and a guiding component including a frustum portion arranged coaxially with a groove of the work piece, a large end face of the frustum portion arranged adjacent to an end surface of the work piece on which the groove is formed, wherein a diameter of the large end face is substantially same as an inner diameter of the groove, wherein the picking components are operable to release the O-ring onto a tapered surface of the frustum portion so that the O-ring is pushed into the groove along the tapered surface.Type: ApplicationFiled: August 12, 2020Publication date: November 26, 2020Inventors: Cheng Li, Feifei Zhao, Weijie Yan
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Patent number: 8091002Abstract: A method for providing ordered capture clocks to detect or locate faults within N clock domains and faults crossing any two clock domains in an integrated circuit or circuit assembly in scan-test or self-test mode, where N>1, each clock domain having one capture clock and a plurality of scan cells, each capture clock comprising a plurality of capture clock pulses; said method comprising: (a) generating and shifting-in N test stimuli to all said scan cells within said N clock domains in said integrated circuit or circuit assembly during a shift-in operation; (b) applying an ordered sequence of capture clocks to all said scan cells within said N clock domains, the ordered sequence of capture clocks comprising at least a plurality of capture clock pulses from two or more selected capture clocks placed in a sequential order such that all clock domains are never triggered simultaneously during a capture operation; and (c) analyzing output responses of all said scan cells to locate any faults therein.Type: GrantFiled: June 9, 2010Date of Patent: January 3, 2012Assignee: Syntest Technologies, Inc.Inventors: Laung-Terng Wang, Shianling Wu, Zhigang Jiang, Jinsong Liu, Hao-Jan Chao, Lizhen Yu, Feifei Zhao, Fangfang Li, Jianping Yan
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Publication number: 20100287430Abstract: A method for providing ordered capture clocks to detect or locate faults within N clock domains and faults crossing any two clock domains in an integrated circuit or circuit assembly in scan-test or self-test mode, where N>1, each clock domain having one capture clock and a plurality of scan cells, each capture clock comprising a plurality of capture clock pulses; said method comprising: (a) generating and shifting-in N test stimuli to all said scan cells within said N clock domains in said integrated circuit or circuit assembly during a shift-in operation; (b) applying an ordered sequence of capture clocks to all said scan cells within said N clock domains, the ordered sequence of capture clocks comprising at least a plurality of capture clock pulses from two or more selected capture clocks placed in a sequential order such that all clock domains are never triggered simultaneously during a capture operation; and (c) analyzing output responses of all said scan cells to locate any faults therein.Type: ApplicationFiled: June 9, 2010Publication date: November 11, 2010Applicant: Syntest Technologies, Inc.Inventors: Laung-Terng WANG, Shianling Wu, Zhigang Jiang, Jinsong Liu, Hao-Jan Chao, Lizhen Yu, Feifei Zhao, Fangfang Li, Jianping Yan