Title explains most of it. Supply is 2 phase 240v (2 hots, 1 neutral). I would rather not use a transformer in this process. The main schematics I keep coming across gives +340 and -340 while I'm trying to get 676VDC relative to ground. If anyone has a route towards this goal (full wave rectification and doubling) that I'm missing I would be happy to hear. Thanks!