Unlearn

Flyback “transformer” is NOT COUPLED INDUCTORS

The objective of this article is to correct two fundamental mistakes most POWER ELECTRONICS ENGINEERS make with following claims:

  1. Flyback transformer is no different than transformer since after all the same symbol is used as for 60Hz line transformer!
  2. Flyback transformer is really COUPLED INDUCTORS!

I am addressing the second claim here by claiming:

Flyback transformer is NOT COUPLED INDUCTORS. Here are the reasons.

First drawing shows flyback converter with its “transformer” with common ground between primary and secondary side. As shown in blue color, the ground connection can be separated to result in . . .

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Direct 48V to 1V, 200A uP Drive

Microprocessor Fast Load Current Changes
The microprocessors and SoC Integrated Circuits impose very demanding large and fast load current changes of 10A/usec to 50A/usec yet requiring ultra small transient voltage overshoot to settle very quickly. This is currently handled by up to 12 synchronous buck converter operating in parallel at 5MHz from 12V input resulting in poor efficiency, large size and high cost! This demand is currently met by third party vendors using the same multistage buck approach consisting of over 40 power management companies slicing the 10 billion dollar market among them by providing 12V to 2V . . .

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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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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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