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Integrated high-quality rectifier-regulators

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3 Author(s)
Madigan, M.T. ; Unitrode Corp., Cary, NC, USA ; Erickson, R.W. ; Ismail, E.H.

A new family of AC-DC converters is derived which integrate the functions of low-harmonic rectification, low-frequency energy storage, and wide-bandwidth output voltage control into a single converter containing one, two, or four active switches. These converters utilize a discontinuous conduction mode input inductor, an internal energy storage capacitor, and transformer secondary circuits which resemble the bridge, forward, flyback, or Cuk DC-DC converters. A large-signal equivalent circuit model for this family is presented, which uses the “loss-free resistor” concept. Design strategies and experimental results are given. High-performance regulation with satisfactory line-current harmonics is demonstrated with conventional duty-ratio control. Further improvements in line current are possible by simultaneous duty-ratio and switching-frequency control

Published in:

Industrial Electronics, IEEE Transactions on  (Volume:46 ,  Issue: 4 )

Date of Publication:

Aug 1999

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