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switching power supplies w/o harmonic currents

Discussion in 'Electronic Basics' started by [email protected], Feb 25, 2004.

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  1. Guest

    Are there any good designs for switching power supplies that can pull current
    through the entire AC full wave cycle (1 phase or 3 phase)?
  2. A flyback (boost) converter run at a fixed duty cycle draws current
    that is just about proportional to applied voltage, so it can produce
    a very high power factor if the single phase line is filtered with a
    low value of capacitance. The effect is not as good for 3 phase
    sources, but three stages (one per phase) can do as well. If the
    converter is run in current mode, and the current setpoint is
    modulated with a factor proportional to the absolute line voltage the
    effect is even better. Gaining a high power factor this way
    necessitates ripple voltage on the output of the converter. I have
    seen designs that subsequently buck regulate the output a second time
    to eliminate the ripple.
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