I'm building a -30v series regulator which will be used to power 4 2 amp current sources but I have come across some practical issues.
For starters I cannot figure out a way to pre filter the AC going into the regulator because I cannot find any lytic caps that can handle the ripple current. I either get large caps which sink huge ripple currents or I get small caps and use a big RC resistor which drops the voltage to nothing with amps of current. There are no cheap inductors that will work and even if they did I would have to use large caps anyway.
I also have a question about heat dissipation. The entire setup will dissipate about 936W across 18 mosfets, 24 if I decide to go with separate regulators per current source.
I currently have a 12 inch by 12 inch alluminum heatsink that has thick 1.3 inch deep fins throughout the surface area on one side. I purchased it here http://www.heatsinkusa.com/12-000-wide-extruded-aluminum-heatsink/
How much heat can I expect this thing to dissipate?
For starters I cannot figure out a way to pre filter the AC going into the regulator because I cannot find any lytic caps that can handle the ripple current. I either get large caps which sink huge ripple currents or I get small caps and use a big RC resistor which drops the voltage to nothing with amps of current. There are no cheap inductors that will work and even if they did I would have to use large caps anyway.
I also have a question about heat dissipation. The entire setup will dissipate about 936W across 18 mosfets, 24 if I decide to go with separate regulators per current source.
I currently have a 12 inch by 12 inch alluminum heatsink that has thick 1.3 inch deep fins throughout the surface area on one side. I purchased it here http://www.heatsinkusa.com/12-000-wide-extruded-aluminum-heatsink/
How much heat can I expect this thing to dissipate?