Power Quality Improvement in Bridgeless Ac–Dc Converter Based Multi-output Switched Mode Power Supply

Shihka Singh; Bhim Singh; G. Bhuvaneswari; Vashist Bist

doi:10.1515/ijeeps-2014-0124

Article

Power Quality Improvement in Bridgeless Ac–Dc Converter Based Multi-output Switched Mode Power Supply

Shihka Singh , Bhim Singh , G. Bhuvaneswari and Vashist Bist

Published/Copyright: October 16, 2014

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From the journal International Journal of Emerging Electric Power Systems Volume 15 Issue 6

Abstract

Computer power supplies are required to have multiple isolated regulated dc voltages with low ripple content and high input power factor at the utility interface. A dc–dc converter is used for obtaining these isolated multi-output dc voltages with excellent regulation. In this paper, a non-isolated ac–dc converter is proposed as the first stage converter to obtain a regulated dc output rather than using a simple uncontrolled diode bridge rectifier at the front end. A dc–dc converter is used at the second stage that has a high frequency transformer with multiple secondary windings to obtain different dc voltage levels at the output. The proposed bridgeless converter based power supply is designed using fundamental design equations, and different component values are calculated. Extensive simulations are carried out to demonstrate the improved performance of the proposed bridgeless converter based multi-output computer power supply at varying source voltages and load conditions. Experimental validation of the power supply is carried on a developed hardware prototype, and the test results are compared with the simulated performance for design verification.

Keywords: multi-output dc voltages; closed loop control; improved power quality; non-isolated Cuk converter; dc–dc converter

Funding statement: Research funding: Department of Science and Technology, Ministry of Science and Technology (Grant/Award Number: RPO 2506).

Appendix

Input voltage: 220 V
First non-isolated ac–dc converter input voltage 198 V, 2 A
Second isolated stage input voltage 311 V, 1.4 A
Final output voltages 12 V, 5 V, 3.3 V, –12 V, –5 V
Non-isolated dc–dc converter gains K_p & K_i: 0.5, 25
Isolated dc–dc converter gains K_p & K_i: 0.8, 35

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Published Online: 2014-10-16

Published in Print: 2014-12-1

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Articles in the same Issue

https://doi.org/10.1515/ijeeps-2014-0124

Keywords for this article

multi-output dc voltages; closed loop control; improved power quality; non-isolated Cuk converter; dc–dc converter