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In Reply to: How to determine the voltage drop in an unloaded and loaded PS posted by DAK on March 2, 2015 at 21:17:10:
I think it is important to understand that if unloaded a choke input supply gives you 1.4X the secondary voltage or around 550V. This means you should use at least 600V caps to avoid problems if a low or no current situation happens.
I would just build it as a pure choke input supply and then slowly add capacitance before L1 until you get near your desired voltage. I find that 1-2uf typically gives me a DC voltage close to the secondary AC voltage (i use mercury tubes) so I would figure you will need something like 2-3uf to get your 400V.
dave
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Follow Ups
- RE: How to determine the voltage drop in an unloaded and loaded PS - dave slagle 10:24:14 03/03/15 (1)
- RE: How to determine the voltage drop in an unloaded and loaded PS - DAK 11:45:35 03/03/15 (0)
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