Patents by Inventor Bhim Singh

Bhim Singh 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).

  • Reduced rating T-connected autotransformer for converting three phase AC voltages to nine/six phase shifted AC voltages
    Patent number: 7375996
    Abstract: The invention provides a T-connected autotransformer for converting three-phase ac input voltages to nine phase shifted ac voltages feeding three sets of three-phase diode rectifier bridges. The nine phase shifted voltages are at an angle of +20 degree or ?20 degree with respect to the supply voltages and their magnitudes are essentially identical. The present design requires substantially fewer coils than other autotransformers for 18-pulse AC-DC converters, resulting in saving in space, volume, weight, size and cost of the converter. The magnetics requirement is only about 30% of the drive rating. The output voltage ratio can also be selected to give an average dc output from the proposed converter same as that of a conventional three-phase diode bridge rectifier. However, it is also possible to step up or step down the output voltage as required.
    Type: Grant
    Filed: September 8, 2006
    Date of Patent: May 20, 2008
    Assignee: Indian Institute of Technology, Delhi-Department of Electrical Engineering
    Inventors: Bhim Singh, Gurumoorty Bhuvaneswari, Vipin Garg
  • Reduced Rating T-Connected Autotransformer For Converting Three Phase AC Voltages To Nine/Six Phase Shifted AC Voltages
    Publication number: 20070103125
    Abstract: The invention provides a T-connected autotransformer for converting three-phase ac input voltages to nine phase shifted ac voltages feeding three sets of three-phase diode rectifier bridges. The nine phase shifted voltages are at an angle of +20 degree or ?20 degree with respect to the supply voltages and their magnitudes are essentially identical. The present design requires substantially fewer coils than other autotransformers for 18-pulse AC-DC converters, resulting in saving in space, volume, weight, size and cost of the converter. The magnetics requirement is only about 30% of the drive rating. The output voltage ratio can also be selected to give an average dc output from the proposed converter same as that of a conventional three-phase diode bridge rectifier. However, it is also possible to step up or step down the output voltage as required.
    Type: Application
    Filed: September 8, 2006
    Publication date: May 10, 2007
    Applicant: INDIAN INSTITUTE OF TECHNOLOGY, DELHI
    Inventors: Bhim Singh, G. Bhuvaneshwari, Vipin Garg