دانلود رایگان مقاله انگلیسی,به حداقل رساندن اعوجاج از طریق حذف هارمونیک در اتصال نامتقارن مبدل DC-DC چند فازی

Ripple Minimization Through Harmonic Elimination in Asymmetric Interleaved Multiphase dc-dc Converters

سال انتشار : 2015

نوع مقاله : IEEE JOURNALS & MAGAZIENS

تعداد صفحات : 13

Abstract—Symmetric multiphase dc-dc converters are widely

used in power electronics, as they enable the processing of high

power through splitting the overall load-current into multiple

phases. Distributing the processed power symmetrically between

the phases and performing ripple minimization through interleaving

is well understood. However, in recent applications such

as maximum power point (MPP) tracking for solar photovoltaic

(PV), converters are forced to operate under asymmetric conditions,

due to differences in the sources or loads of each converter.

This work presents a control technique, based on harmonic

elimination, that allows for ripple minimization under asymmetric

conditions. The mathematical derivations are outlined and

simulations are used to evaluate the performance of the proposed

technique. Measurements taken from an experimental prototype,

consisting of three dc-dc buck converters, demonstrate significant

improvements in ripple reduction over conventional interleaving

techniques. When the multi-phase converter is operated at the

optimum asymmetric phase-shift found through the techniques

presented here, a more than 3x reduction in net current ripple

is observed under realistic operating conditions. Additionally,

the undesirable first harmonic ripple component is reduced by

14.8 dB with the proposed technique.

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