That rcgroup forum does not seem to have any credibility for me, hence why I am writing about it here, where we can properly discuss engineering aspects of the thing, not just randomly hacking the thing by making assumptions.
The module is already dismantled. Photo here:
Sorry for external link, I will upload images here later.
Quick but information dense description of the PSU:What is inside: It is a dual redundant PSU, two AC inputs, two separate active PFC correction circuit (boost topology), two separate DC links (each two caps is one of them). Not really interested in reverse engineering the PFC, there is nothing interesting in it, apart from it looking like it is an off-the-shelf bought module, as the design style is quite different, then the rest of it.
The main DC/DC: each separate DC bus has its separate DC/DC. The DC/DC converter is a full bridge, with a center-tapped secondary, choke in the center tap, two STTH2003 rectifiers, one per leg. Each STTH2003 is connected as a parallel pair. Each one has a parallel R-L network connected in series with its anode. The little chokes are heatsinked on a common heatsink with the diodes. What the fack is that RL network for?! R is I think 420ohm, 3W. (
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The H-bridge uses (WTF!) IRF840 low side mosfets driven by a common low side gate drive transformer. High side uses IRFP450, also driven by a common gate drive transformer. Not sure what type of modulation scheme it uses, as the combination of weak low side and high power high side fets does not make much sense. Combined together with the fact there is a common gate transformer for low and high sides, it means that you can never have both low and high sides turned on at the same time. O_o

What I can say more so far? Probably that I will throw some schematic on a paper in a minute, and that the decoupling caps for the H bridges are way tooo far from the transistors. (those small brown caps in the middle of the board, mosfets are on the large heatsink under the transformers.)