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Thread: Active PFC

  1. #11
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    Quote Originally Posted by psupply View Post
    sometimes there are 2 caps primary, but why? is it maybe parallel connected for increase the electric capacity?

    I would say inductance; if connected in parallel the capacitance doubles, but the inductance halves (above and beyond the fact that they each already have less inductance than a single one of double the capacitance).

    At first I thought that this is a silly argument as the frequency is low, but that is no longer true when part of an APFC circuit.
    Last edited by ashiekh; 06-24-2019 at 05:38 PM.

  2. #12
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    Also about APFC - is APFC just a boost converter which utilizes PWM to simulate linear load? (just checking my understanding)

  3. #13
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    Linear load = resistive load?

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    Quote Originally Posted by ashiekh View Post
    Linear load = resistive load?
    Resistive loads are linear, but not just resistive loads. Any electronic load that adds or removes harmonic content (i.e. transistors, diodes, saturated magnetics) is not linear.

  5. #15
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    I think APFC is trying to look resistive, not capacitive or inductive (i.e. phase is playing an important role).
    Last edited by ashiekh; 06-26-2019 at 09:53 AM.

  6. #16
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    Yes, just trying to be precise.

  7. #17
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    Absolutely; avoids confusion.

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