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Registered Member #135
Joined: Sat Feb 11 2006, 12:06AM
Location: Anywhere is fine
Posts: 1735
You probably ought to try looking for a supply to match your lasing unit.
My supply, which is not continuous output by the way but pulsed, has a very large storage capacitor, 120uF at several kv, so no matter what you do the value is going to be pretty large.
You're just calculating for ripple and getting 30uF, well what happens when you discharge it in your system? You need a cap bigger still to handle discharging AND ripple reduction.
If you're going for a transformer-rectifier setup you would need the 3 phase arrangement because single phase will give you ripple of 35%-45%. Then you would need to have a large maybe 100uF 18kvdc filter cap, feeding a HV choke, then another HV filter cap. What you would probably end up with is a supply that blows itself out from the transient surge if you're not careful with ballasting.
If I were in your position I would call it a research project and have college foot the bill. Then call up Plastic Capacitors and see what they can do for you.
Registered Member #311
Joined: Sun Mar 12 2006, 08:28PM
Location:
Posts: 253
Masih wrote ...
the output voltage is not arbitrary and calculated by experts. actualy i can provide a transformer for producing HV from mains voltage. first I decided to chose the staright forward method of full bridge diodes and capacitor to achieve this High voltage. but when I calculated the capacity of capacitor for 100v of ripple I got disappointed of this way. the capacitance which yields is 30uF which is huge in size and cost. so I decided to work on switch mode.
Have you looked at inductive filtering on the output? As only the ripple voltage appears across the inductor, it would not need any special HV construction other than floating the whole thing above ground.
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