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| The correspondence of capacity between accumulators and capacitors |
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| digsys:
ok going back to your original requirements - --- Quote from: Kirill V --- For ultimate performance AC part can be turned off and in this case battery used as storage --- End quote --- Set your first regulator to 13.8V (trickle charge) and direct on to a lead-acid type battery. It can be SLA, AGM etc whatever you like. Lead-acid don't need fancy charge / energy profiles. They can stay on trickle charge voltage for ever. So that part is fixed --- Quote from: Kirill V --- rectifier - battery - voltage stabilizer - output. This is for low noise and ripple. Rectifier can be used for standby charge of battery and in this case battery able to smooth out ripples? --- End quote --- As I mentioned, batteries are no good for HF type ripple, so you'll need HF / low ESR type capacitors after the battery to fix that. By using the battery as well, you won't need huge bulk energy caps for storage, just filtering. Several smaller / low ESR are best for your application, as well as the usual types to cover your requirements (which we don't really know :-) ) |
| Kirill V.:
Thanks, digsys! --- Quote from: digsys ---(which we don't really know :-) ) --- End quote --- The brand-name power supplies have noise no more than several millivolts. But high quality supplies have noise in microvolt range. I want to get as close as possible to this result. It's very interesting technical problem. I want use battery of CSB brand. What can you say about this product? |
| digsys:
--- Quote from: Kirill V --- .. I want use battery of CSB brand. What can you say about this product? --- End quote --- Looks like a nice series .. I may check these out myself :-) One option I didn't mention - IF HF type ripple / noise is important, have you looked at linear P/Supplies? These are often specified in critical applications, where S/Mode is not allowed or dangerous. I have been designing these for years for mines / hospitals / intrinsic areas. Literally zero EMI / noise. Just some 50Hz ripple, which is easy to fix. The only possible downsides are size / weight and heat. The ones I design have far better efficiencies than most S/Modes, so the heat part can be fixed. |
| Kirill V.:
My supply will be linear only. I sayed already that: --- Quote ---Regulator after battery it is precision op-amp with power amplifier. Not LMxxx or similar ICs. --- End quote --- Simplified diagram: I choose electrolytic capacitors for bypassing. I can buy this: https://www.tdk-electronics.tdk.com/inf/20/30/db/aec/B41858.pdf Or this: https://www.tdk-electronics.tdk.com/inf/20/30/db/aec/B41859.pdf I found some types: high ripple current, low impedance, very low impedance, low ESR, In my opinion, for my application low/ultralow impedance or ESR is more suitable, I am correct? |
| digsys:
--- Quote from: Kirill V --- My supply will be linear only. I sayed already that ... --- End quote --- Yes, but some people use a S/Mode DC Input (from mains), at a slightly higher voltage to derive a stable fixed DC source. That was the part that wasn't clear. IF you are using a transformer, then is it way less of an issue - correct. --- Quote from: Kirill V --- ... Or this: https://www.tdk-electronics.tdk.com/inf/20/30/db/aec/B41859.pdf In my opinion, for my application low/ultralow impedance or ESR is more suitable, I am correct? --- End quote --- Yep, those are nice. You will STILL need to add - say 0.1uF, 1000pF, 100pF HF caps as well, and maybe even a common mode / choke. That will depend on exactly how clean you are looking for. No one can advise you on that - When I come across that situation, and I did last month, I left room on the PCB for various combinations of filtering etc, then tested the results in the "real world". Theory is fine, but real-world always like to mess with you. Even happens to me, after 40 yrs of the stuff :-) |
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