Electronics > Beginners
Weird switching topologies you don't see anymore
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soldar:
https://en.wikipedia.org/wiki/Single-ended_primary-inductor_converter (SEPIC)

https://en.wikipedia.org/wiki/%C4%86uk_converter (Cuk)
bd139:
Does a Royer converter count? Just built one today to drag +/-15V out of a 5V supply.



There's only 4 discrete components on the primary and I'm measuring ~ 85% efficiency! I'm rather pleased with it.
T3sl4co1l:
Not really, as it's a standard transformer-coupled push-pull topology?

It's another one on the list though.

An interesting case is synthesizing more alternatives; the V-I dual of the constant-voltage half-bridge is the constant-current push-pull.

The half bridge has two series transistors, and two series capacitors, with the load strung between the midpoints.
The CCPP has two parallel-acting transistors, and two parallel-acting (coupled) inductors (indeed, one centertapped inductor), with the load strung between the endpoints).  In other words, the Baxandall oscillator.  Mind, this is often misattributed as Royer, but it's not saturation commutated, but is resonant and current-fed (i.e., a large series inductor, or ideally a current source as such).

And the dual of the CVPP is the current-fed half bridge, which uses a centertapped inductor to serve the same purpose.  It's a really oddball one (and also not something you'll ever see, for the same reason), but interesting theoretically.  Hmm, I don't happen to have a schematic representation handy, for shame.  I'll have to re-synthesize it some time.

Tim
chris_leyson:
The Jensen converter is an improvement on the Royer, the saturable transformer is moved to the base drive and a conventional transformer is used for the main transformer. See picture below, a. Royer, b. Jensen, c. current driven Royer and d. interleaved boost derived. https://www.researchgate.net/publication/3280666_A_Novel_Self-Oscillating_Boost-Derived_DC-DC_Converter_With_Load_Regulation
EDIT: "Modern DC-to-DC Switchmode Power Converter Circuits" Severns and Bloom 1985 has several topologies that you never see.

David Hess:

--- Quote from: chris_leyson on July 24, 2019, 08:39:43 pm ---The Jensen converter is an improvement on the Royer, the saturable transformer is moved to the base drive and a conventional transformer is used for the main transformer.
--- End quote ---

I did not know there was a special name for that configuration.  Tektronix used the two transformer Royer configuration in their 22xx series oscilloscopes.  Later it was replaced by a current driven synchronous push-pull inverter.
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