Patents by Inventor Jiecheng Zhao
Jiecheng 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: 20230336184Abstract: The present disclosure relates to a high-speed and low-power successive approximation register analog-to-digital converter (SAR ADC) and an analog-to-digital conversion method. Binary redundancy reassembly is performed to improve a digital-to-analog converter (DAC) capacitor array included in the SAR ADC such that the total number of capacitors included in a capacitor sub-array of the DAC capacitor array is greater than the number of precision bits of the SAR ADC, and the total number of unit capacitors included in all capacitors when the total number of capacitors included in the capacitor sub-array is greater than the number of precision bits of the SAR ADC is equal to the total number of unit capacitors included in all capacitors when the total number of capacitors included in the capacitor sub-array is equal to the number of precision bits of the SAR ADC.Type: ApplicationFiled: June 23, 2022Publication date: October 19, 2023Inventors: Zhixiang Huang, Xueshi Hou, Zongming Duan, Bowen Wu, Jiecheng Zhao
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Patent number: 11537086Abstract: A pulsar based timing synchronization method and system are disclosed. In one example, a method includes receiving, by a pulsar signal receiver device, a pulse signal emitted from one or more celestial objects and processing, by the pulsar signal receiver device, the pulse signal to discipline a local clock to determine an accurate time output. The method also includes generating, by the pulsar signal receiver device, a timing synchronization signal based on the determined accurate time output. The method further includes providing, by the pulsar signal receiver device, the timing synchronization signal to at least one of a local power system device and a timing distribution network server.Type: GrantFiled: April 29, 2019Date of Patent: December 27, 2022Assignees: University of Tennessee Research Foundation, UT-Battelle, LLCInventors: Jiecheng Zhao, Yilu Liu, Yong Liu, Peter Louis Fuhr, Tom King, He Yin, Lingwei Zhan, Marissa Morales-Rodriguez, Wenxuan Yao
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Patent number: 11372038Abstract: A system and methods for monitoring an impact of geomagnetic disturbances (GMDs) or an E3 component of electromagnetic pulses (EMP-E3), involving a transducer generating a transduced signal in response to a magnetic field of a current carrying element of a transmission line. The transduced signal reflects harmonic characteristics of the current carrying element, and is amplified and filtered, then digitally converted. Excessive impact is detected when a threshold condition is met with respect to a total harmonic distortion (THD) and/or a change in THD. The THD can be calculated from amplitudes of harmonic components of interest. The amplitudes can be calculated in various ways, including Fourier transforming the digital signal to locate peaks in the resulting spectral lines, or using a phase sensitive detection algorithm in which the digital signal is multiplied by a phase swept reference signal and then integrated.Type: GrantFiled: November 11, 2016Date of Patent: June 28, 2022Assignees: University of Tennessee Research Foundation, UT-BATTELLE, LLCInventors: Wenxuan Yao, Jiecheng Zhao, Yi Cui, Yilu Liu, Thomas J. King
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Patent number: 11069370Abstract: Systems and methods for detecting a tampering and identifying a location of a digital recording are provided. A frequency sequence and a phase angle sequence may be extracted from the digital recording. A portion of the frequency sequence may be matched to one of a plurality of reference frequency sequences, and a portion of the phase angle sequence may be matched to one of a plurality of reference phase angle sequences. Tampering of the digital recording may be detected when the frequency and phase sequences differ from the matched reference sequences. Moreover, a noise sequence may be extracted from the extracted frequency sequence. A location of the digital recording may be identified by matching the noise sequence to one of a plurality of noise sequences of the plurality of reference frequency sequences.Type: GrantFiled: January 11, 2016Date of Patent: July 20, 2021Assignees: UNIVERSITY OF TENNESSEE RESEARCH FOUNDATION, UT-BATTELLE, LLCInventors: Jidong Chai, Yilu Liu, Jiecheng Zhao, Wenxuan Yao, Thomas J. King
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Publication number: 20190332067Abstract: A pulsar based timing synchronization method and system are disclosed. In one example, a method includes receiving, by a pulsar signal receiver device, a pulse signal emitted from one or more celestial objects and processing, by the pulsar signal receiver device, the pulse signal to discipline a local clock to determine an accurate time output. The method also includes generating, by the pulsar signal receiver device, a timing synchronization signal based on the determined accurate time output. The method further includes providing, by the pulsar signal receiver device, the timing synchronization signal to at least one of a local power system device and a timing distribution network server.Type: ApplicationFiled: April 29, 2019Publication date: October 31, 2019Inventors: Jiecheng Zhao, Yilu Liu, Yong Liu, Peter Louis Fuhr, Tom King, He Yin, Lingwei Zhan, Marissa Morales-Rodriguez, Wenxuan Yao
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Patent number: 10191094Abstract: A synchrophasor measurement method for a device configured to take synchronized measurements in a power system is provided. The synchrophasor measurement method includes receiving global positioning system (GPS)-synchronized samples of a signal sensed by the device from the power system; determining a level of distortion of the signal; selecting, based on the level of distortion, a computation method, the computation method being one of an improved zero-crossing (IZC) method and an enhanced phase-lock-loop (EPLL) method; performing the selected computation method to determine at least one parameter of the signal at a reporting frequency, which is at least twice a line frequency of the power system; and outputting, at the reporting frequency, the at least one parameter to an operator of the power system to allow the operator to perform at least one of a monitoring and a controlling of at least one element of the power system.Type: GrantFiled: May 31, 2017Date of Patent: January 29, 2019Assignees: University of Tennessee Research Foundation, UT-Battelle, LLCInventors: Wenxuan Yao, Jiecheng Zhao, Yilu Liu, Andrew N. Herron, Daniel J. King, Thomas J. King, Jr., Lingwei Zhan
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Publication number: 20180348266Abstract: A synchrophasor measurement method for a device configured to take synchronized measurements in a power system is provided. The synchrophasor measurement method includes receiving global positioning system (GPS)-synchronized samples of a signal sensed by the device from the power system; determining a level of distortion of the signal; selecting, based on the level of distortion, a computation method, the computation method being one of an improved zero-crossing (IZC) method and an enhanced phase-lock-loop (EPLL) method; performing the selected computation method to determine at least one parameter of the signal at a reporting frequency, which is at least twice a line frequency of the power system; and outputting, at the reporting frequency, the at least one parameter to an operator of the power system to allow the operator to perform at least one of a monitoring and a controlling of at least one element of the power system.Type: ApplicationFiled: May 31, 2017Publication date: December 6, 2018Applicants: University of Tennessee Research Foundation, UT-BATTELLE, LLCInventors: Wenxuan YAO, Jiecheng ZHAO, Yilu LIU, Andrew N. HERRON, Daniel J. KING, Thomas J. KING, JR., Lingwei ZHAN
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Publication number: 20180136267Abstract: A system and methods for monitoring an impact of geomagnetic disturbances (GMDs) or an E3 component of electromagnetic pulses (EMP-E3), involving a transducer generating a transduced signal in response to a magnetic field of a current carrying element of a transmission line. The transduced signal reflects harmonic characteristics of the current carrying element, and is amplified and filtered, then digitally converted. Excessive impact is detected when a threshold condition is met with respect to a total harmonic distortion (THD) and/or a change in THD. The THD can be calculated from amplitudes of harmonic components of interest. The amplitudes can be calculated in various ways, including Fourier transforming the digital signal to locate peaks in the resulting spectral lines, or using a phase sensitive detection algorithm in which the digital signal is multiplied by a phase swept reference signal and then integrated.Type: ApplicationFiled: November 11, 2016Publication date: May 17, 2018Inventors: Wenxuan Yao, Jiecheng Zhao, Yi Cui, Yilu Liu, Thomas J. King
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Publication number: 20170200457Abstract: Systems and methods for detecting a tampering and identifying a location of a digital recording are provided. A frequency sequence and a phase angle sequence may be extracted from the digital recording. A portion of the frequency sequence may be matched to one of a plurality of reference frequency sequences, and a portion of the phase angle sequence may be matched to one of a plurality of reference phase angle sequences. Tampering of the digital recording may be detected when the frequency and phase sequences differ from the matched reference sequences. Moreover, a noise sequence may be extracted from the extracted frequency sequence. A location of the digital recording may be identified by matching the noise sequence to one of a plurality of noise sequences of the plurality of reference frequency sequences.Type: ApplicationFiled: January 11, 2016Publication date: July 13, 2017Inventors: Jidong Chai, Yilu Liu, Jiecheng Zhao, Wenxuan Yao, Thomas J. King