With most equipment stating 'automotive nominal' input voltages of between 13.2v ~ 13.8v DC, they work just fine on 12.x volts DC -- ergo, first ascertain if you need to do anything at all.
edit: just to answer this one...
These details form part of the 'IP' (intellectual property) of the manufacturer, and rarely gets released into the wild. The details are available, one just needs to provide their own intellect =)My stumper here is finding schematics for the OVC and over current controller boards. They seem unobtainable.
*examine PSU to determine what controller IC(s) are used -- grab the datasheets for same
*reverse engineer the circuitry/components used to implement these devices -- reference results against datasheet application circuits/operational values to determine what the PSU manufacturer has done.
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