Quote:
Originally Posted by enquirium
. . . most switch mode PSUs for computers etc use just such an arrangement after the bridge rectification input . Why that is . . .
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An SMPSU - as used in PCs - are frequently designed to be powered from 230v a.c. or 115v a.c. Often a switch is fitted to change from one to the other. This switch changes the rectifier / capacitor configuration: when on 230v setting, it becomes a conventional bridge rectifier with the caps. in parallel; when on 115v, it becomes a voltage doubler, with the caps. in series.
Al / Skywave.