Articles

Biggest Impact: Devices or Magnetics?

Comments on Rap Session 1 at APEC 2018
The Rap Sessions 1 last year concluded that “we have all the topologies we need” with flyback and LLC converter declared undisputed champions!? The same moderator and several returning panel members who adjudicated that last year changed this year their hats from topology to become either MAGNETICS or DEVICES experts!? With topologies declared dead on arrival, they invented an artificial contest for Rap Session 1 at this APEC 2018 entitled: BIGGEST IMPACT ON POWER CONVERSION: DEVICES OR MAGNETICS? This is like comparing Apples and Oranges! The only thing they have in common . . .

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Coupled-Inductor SEPIC converter

Perfectly Coupled-Inductor SEPIC converter
Reduces to WHICH Converter?
Analysis of Equivalent Circuit Transformations
by Professor Slobodan Ćuk
Perfectly Coupled-Inductor SEPIC Converter

Abstract
For quite a while now, the various “shortcuts” were circulated on LinkedIn media, such as IEEE Power Electronics Society and various websites extolling the virtues of the PWM switch small-signal model! In particular, the claim is made that the “magic shortcuts” could reduce frequency response of a Perfectly Coupled-Inductor Nonisolated SEPIC converter (CI Converter from now on!) to that of a Boost converter as included in a prior discussion to this group . . .

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What Comes First: Devices or Topology

Topologies Comparison

Present Power Electronics Systems are built upon and resemble an INVERTED pyramid which is by definition unsustainable and ready to collapse at any moment. Why? At its bottom it has the buck converter as its foundation which than supports the next level single ended isolated converter like flyback and forward to culminate on the third level into bridge type converter with even more switching devices. Consequence: buck converter problems lead to collapse of the whole structure irrespective what switching devices are used.

The buck converter does have huge problems: device voltage stresses much higher than output regulated DC . . .

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