Unity Power Factor Operated PFC Converter Based Power Supply for Computers

  • Shikha Singh
  • Bhim Singh
  • G. Bhuvaneswari
  • Vashist Bist
Original Contribution


Power Supplies (PSs) employed in personal computers pollute the single phase ac mains by drawing distorted current at a substandard Power Factor (PF). The harmonic distortion of the supply current in these personal computers are observed 75% to 90% with the Crest Factor (CF) being very high which escalates losses in the distribution system. To find a tangible solution to these issues, a non-isolated PFC converter is employed at the input of isolated converter that is capable of improving the input power quality apart from regulating the dc voltage at its output. This is given to the isolated stage that yields completely isolated and stiffly regulated multiple output voltages which is the prime requirement of computer PS. The operation of the proposed PS is evaluated under various operating conditions and the results show improved performance depicting nearly unity PF and low input current harmonics. The prototype of this PS is developed in laboratory environment and test results are recorded which corroborate the power quality improvement observed in simulation results under various operating conditions.


Computer PS Power quality Cuk converter Multiple dc voltages 



The authors are grateful to Department of Science and Technology, Government of India for funding their project.


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Copyright information

© The Institution of Engineers (India) 2017

Authors and Affiliations

  • Shikha Singh
    • 1
  • Bhim Singh
    • 2
  • G. Bhuvaneswari
    • 2
  • Vashist Bist
    • 3
  1. 1.Department of Electrical EngineeringShri Ramswaroop Memorial UniversityLucknowIndia
  2. 2.Department of Electrical EngineeringIndian Institute of Technology DelhiNew DelhiIndia
  3. 3.Texas InstrumentsBengaluruIndia

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