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Digital power-factor correction for a capacitor-charging power supply

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3 Author(s)
Newsom, R.L. ; Syst. Technol. Design, IBM Corp., Poughkeepsie, NY, USA ; Dillard, W.C. ; Nelms, R.M.

The design and construction of a low-power low-cost power supply capable of charging an energy storage capacitor from a 120-V AC source and capable of power-factor correction (PFC) is presented. The load that is generally connected to a capacitor-charging power supply (CCPS) is a pulsed power load (i.e., laser, cardiac defibrillator, or flash lamp). A flyback converter was incorporated into the CCPS because it is capable of charging a capacitor while maintaining a high power factor. The control system of the CCPS uses peak current control to achieve PFC and is implemented using standard "off-the-shelf" digital logic components. A 300-V prototype has been constructed and tested. The experimental results show that a high power factor is obtained by the CCPS utilizing a flyback converter and the digital logic control system.

Published in:

Industrial Electronics, IEEE Transactions on  (Volume:49 ,  Issue: 5 )

Date of Publication:

Oct 2002

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