The most effective half about autopsy teardowns of electronics is if you uncover some uncommon design options, whether or not or not these are associated to the unique fault. Within the case of a latest [DiodeGoneWild] video involving the teardown of an industrial DIN-rail mounted 24 V, 960 Watt energy provide, the supply of the reported bang was straightforward sufficient to identify. In the course of the subsequent teardown of this very properly modular PSU the automated energy issue correction (APFC) board confirmed it to have an uncommon design, which obtained captured in a schematic and is defined within the video.
Selecting such a APFC design appears to have been executed within the title of effectivity, bypassing two of the inner diodes within the bridge rectifier with the exterior MOSFETs and ultrafast diodes. Briefly, it prevents among the typical diode voltage drops by eradicating diodes within the path of the present.
Though not a brand new design, as succinctly identified within the feedback by [marcogeri], it’s defined how even reducing out one diode price of voltage drop in a PSU like this will save 10 Watt of losses. Since DIN rail PSUs hardly ever characteristic followers for energetic cooling, this type of APFC design is extremely related and helps to stop passively cooled PSUs from spiraling into much more of a thermal nightmare.
As for the trigger behind the sooty skid marks on one of many PCBs, that can be coated within the subsequent video.
