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I'm trying to create a +160v and +/- 100v supply that with idle at 2A. The problem I'm having is I can't find capacitors that can handle the ripple currents for the prefilter. I need to order like $200 worth of caps to keep the ripple currents barely within spec. LC and RC filters don't work because without a capacitor before them the DC loss is too great. Is there a sane way to filter at these currents? A few volts of ripple is fine, I just need the caps to not die after a month. Any ideas? enter image description here

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  • \$\begingroup\$ What ripple currents are you expecting, and how did you determine them? \$\endgroup\$ – Bruce Abbott Jan 7 '18 at 1:48
  • \$\begingroup\$ There are high-ripple capacitors for SMPS applications. In what way are these not good enough? Is ESR a factor as well? \$\endgroup\$ – Sparky256 Jan 7 '18 at 1:50
  • \$\begingroup\$ For example, a 10,000uf capacitor filtering @ 2A DC will, according to LTSpice, have ripple currents of 29A @ 160v. A 10,000uf cap cannot handle that. \$\endgroup\$ – coinmaster Jan 7 '18 at 1:58
  • \$\begingroup\$ Could you post your LT Spice? \$\endgroup\$ – Tyler Jan 7 '18 at 2:28
  • \$\begingroup\$ Posted it to opener. \$\endgroup\$ – coinmaster Jan 7 '18 at 2:35

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