Patents by Inventor Zhishou Zheng

Zhishou Zheng 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).

  • Three-phase electric energy measurement apparatus
    Patent number: 8823359
    Abstract: This disclosure relates to a three-phase electric energy measurement apparatus, comprising: a voltage detection unit for detecting voltage of each phase in power transmitting lines where the voltage detection unit is; a current detection unit for detecting current of each phase in the power transmitting lines where the current detection unit is; an electric energy calculation unit, connected to said voltage detection unit and said current detection unit, for receiving signals outputted from said voltage detection unit and said current detection unit, and performing signal processing and calculation, and then outputting a calculation result; wherein both said voltage detection unit and said electric energy calculation unit are connected in a star connection mode, forming a common virtual ground. Through the above-mentioned grounding manner different from that in the prior art, a three-phase four-wire electric energy meter is formed using a three-phase three-wire connection method.
    Type: Grant
    Filed: December 11, 2009
    Date of Patent: September 2, 2014
    Assignee: National Institute of Metrology P.R. China
    Inventors: Zhigao Zhang, Zhishou Zheng, Qingchang Qu
  • THREE-PHASE ELECTRIC ENERGY MEASUREMENT APPARATUS
    Publication number: 20110267032
    Abstract: This disclosure relates to a three-phase electric energy measurement apparatus, comprising: a voltage detection unit for detecting voltage of each phase in power transmitting lines where the voltage detection unit is; a current detection unit for detecting current of each phase in the power transmitting lines where the current detection unit is; an electric energy calculation unit, connected to said voltage detection unit and said current detection unit, for receiving signals outputted from said voltage detection unit and said current detection unit, and performing signal processing and calculation, and then outputting a calculation result; wherein both said voltage detection unit and said electric energy calculation unit are connected in a star connection mode, forming a common virtual ground. Through the above-mentioned grounding manner different from that in the prior art, a three-phase four-wire electric energy meter is formed using a three-phase three-wire connection method.
    Type: Application
    Filed: December 11, 2009
    Publication date: November 3, 2011
    Inventors: Zhigao Zhang, Zhishou Zheng, Qingchang Qu