Electronics > Projects, Designs, and Technical Stuff
switching-PSUs: why can't you usually exceed the 50% of declared power?
nfmax:
--- Quote from: coppice on May 24, 2020, 04:45:46 pm ---
--- Quote from: Monkeh on May 24, 2020, 04:40:39 pm ---
--- Quote from: PKTKS on May 24, 2020, 02:15:18 pm ---Add to the list of costs a REQUIRED TRUE SINE INVERTER
for those setups using PFC based sensitive loads.
--- End quote ---
And yet I achieve uptimes measured in years with no REQUIRED TRUE SINE INVERTER in sight. No INVERTER at all, actually. Or anything else in all-caps you might want to mention..
--- End quote ---
Many countries are not familiar with a public power supply more reliable than the bulk of UPS solutions.
--- End quote ---
Though even there, it may not be TRUE SINE mains anyway:
https://www.eevblog.com/forum/projects/show-us-your-mains-waveform!/
Monkeh:
--- Quote from: coppice on May 24, 2020, 04:45:46 pm ---
--- Quote from: Monkeh on May 24, 2020, 04:40:39 pm ---
--- Quote from: PKTKS on May 24, 2020, 02:15:18 pm ---Add to the list of costs a REQUIRED TRUE SINE INVERTER
for those setups using PFC based sensitive loads.
--- End quote ---
And yet I achieve uptimes measured in years with no REQUIRED TRUE SINE INVERTER in sight. No INVERTER at all, actually. Or anything else in all-caps you might want to mention..
--- End quote ---
Many countries are not familiar with a public power supply more reliable than the bulk of UPS solutions.
--- End quote ---
Indeed. But that does not mean everyone using a computer globally requires a UPS.
wizard69:
--- Quote from: 0db on May 23, 2020, 09:04:53 pm ---
--- Quote from: wraper on May 23, 2020, 08:50:54 pm ---Really, is it that hard to figure it out?
--- End quote ---
I'd like to know details: is it for capacitors? if so, which is the difference between "good" capacitors and "bad" capacitors? And is there any table around telling which are good ones (vendor/models/etc)?
--- End quote ---
Why do you want to know, cheap or scam hardware is what it is. A bad supply can be the result of many things from one substandard component to the whole thing being built to one standard with a label slapped on it indicating another capability. In some cases it is a simple as that, a label gets slapped on a device that does not meet the devices designed specs.
--- Quote ---Is it for the transformer? Filters? Protection chip? Oscillators? What does make a PSU a "bad" PSU?
It's too easy to say "oh, because it's cheap". Cheap means all and nothing.
--- End quote ---
Cheap means everything. It can mean cutting corners. It can mean out right lies about a products capability. Or it can simply mean that the cheapest parts possible got embedded in the PSU. This really isn't hard to understand.
wizard69:
--- Quote from: Monkeh on May 24, 2020, 04:53:46 pm ---
--- Quote from: coppice on May 24, 2020, 04:45:46 pm ---
--- Quote from: Monkeh on May 24, 2020, 04:40:39 pm ---
--- Quote from: PKTKS on May 24, 2020, 02:15:18 pm ---Add to the list of costs a REQUIRED TRUE SINE INVERTER
for those setups using PFC based sensitive loads.
--- End quote ---
And yet I achieve uptimes measured in years with no REQUIRED TRUE SINE INVERTER in sight. No INVERTER at all, actually. Or anything else in all-caps you might want to mention..
--- End quote ---
Many countries are not familiar with a public power supply more reliable than the bulk of UPS solutions.
--- End quote ---
Indeed. But that does not mean everyone using a computer globally requires a UPS.
--- End quote ---
More importantly people can buy laptops with batteries included if power is a real issue. Cheaper than a UPS. Marginal utilities can be a problem anywhere and as such laptops are a good way to deal with that. Yes I realize that a laptop does not replace a workstation performance wise but that is another issue.
To pull the discussion back on track a bit laptop power adapters are not the most reliable things either. Again if varies from manufacture to manufacture but one can see awfully high failure rates in these adapters.
Monkeh:
--- Quote from: wizard69 on May 24, 2020, 06:46:38 pm ---To pull the discussion back on track a bit laptop power adapters are not the most reliable things either. Again if varies from manufacture to manufacture but one can see awfully high failure rates in these adapters.
--- End quote ---
Consequence of the primary design compromises: Size and cost. That and being left on carpets, getting blankets tossed on them, and so forth.
IME the ones used on cheap tat like MSI and Acer aren't stellar, the ones supplied with the business grade machines tend to be tougher.
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