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If you use filter capacitors for smoothing of DC, it will increase voltage at the output by a factro of 1.41 thus some voltage divider or alternate can be resorted if the 240 AC to 240DC is critical.
These means, that you must have a DC/DC Converter with Dc Input of ca. 300-350V.
Check pls **broken link removed** has a good designer Sw (downloadable) & rich ApplNotes...
"PI Expert® Suite v7.1 simplifies the design of off-line power supplies and DC-DC converters based on PI products."
ST is another good source of ApplNotes.