Many HV caps are not rated for pulse discharge currents. Check with Plasti= c Capacitors, they have good data sheets which should at least be informati= ve. And keep your Jesus Stick handy! -- David VanHorn Lead Hardware Engineer Backcountry Access, Inc. 2820 Wilderness Pl, Unit H Boulder, CO =A080301 USA phone:=A0303-417-1345 =A0x110 email:=A0david.vanhorn@backcountryaccess.com=A0 -----Original Message----- From: piclist-bounces@mit.edu On Behalf Of Luis M= oreira Sent: Tuesday, September 24, 2019 1:24 AM To: Microcontroller discussion list - Public. Subject: [EE] Capacitor Bank upgrade Hi all, I'm working on a DC pulsed 30KV 50A power supply which uses a capacitor ban= k to store the energy required for the 30mS pulse. Currently it has 300uF b= ank of oil filled capacitors made up of 37.5uF caps in parallel. This is an old power supply (18 years old) and I don't really have that muc= h info on the caps except for working voltage (32KV), max tested voltage (45KV) and capacitance( 37.5uF). I have done some measurements on one of th= e caps using a LCR meter at 100Hz and 120Hz and that confirmed the capacita= nce value and gave me some resistance value also of R =3D120mohms. I also g= ot Z and L, although I'm not sure they are relevant. I need to increase the capacitor bank to extend the pulse time and this obv= iously raises the issue of if I can just order some HV capacitors with simi= lar voltage withstand and the required capacitance and add them in parallel= .. My issue is that I don't have any info on working current, peak current w= ithstand and ESR. looking at the info I have available current can go up to 140A, in some c= onditions, hence I was aiming to get some 300A peak current to have a bit o= f headroom. I can go higher but size and cost may become an issue. In principle I can't see any issue in adding the new capacitors to the exis= ting ones in parallel, they are charged from a common supply and discharged= via a common busbar, but I keep on having this doubt on instantaneous disc= harging and the effect of different ESR. What do you guys think, am I overt= hinking it? any insights would be appreciated. Thank you. Best Regards Luis -- http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/chang= e your membership options at http://mailman.mit.edu/mailman/listinfo/piclis= t --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .