Capacitor-coupled converter question

by El Ectric   Last Updated January 14, 2018 02:25 AM

Recently, I've gotten myself acquainted with the three capacitor-coupled DC-DC converters, (Cuk, SEPIC, and Zeta). I've read somewhere that they are difficult to control, and some say that this is because they are fourth-order converters. Why is this, and how are they difficult to control (if they are actually)?

Additionally, how good are these converters at low-frequency (120-ish Hertz and below) ripple rejection?

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