Electronics > Beginners
The correspondence of capacity between accumulators and capacitors
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 :-)
Navigation
[0] Message Index
[*] Previous page
Go to full version