Page 2 of 2 FirstFirst 12
Results 11 to 16 of 16

Thread: Why is this PSU not recommended

  1. #11
    Join Date
    Jul 2009
    Location
    Germany
    Posts
    3,638
    Thanks Thanks Given 
    6
    Thanks Thanks Received 
    64
    Thanked in
    58 Posts

    Default

    Quote Originally Posted by rgbodosk View Post
    What happends when just connecting that to the 110V powergrid(When assuming there is no UVP)? Insufficient component specs? And if(surely) something goes wrong, why that happends?
    Depends how you use them and how the protections are implemented.

    In some cases you can use them but they blow up in other cases they shut down far before reaching max. load.

  2. #12
    Join Date
    Aug 2018
    Location
    Korea
    Posts
    236
    Thanks Thanks Given 
    122
    Thanks Thanks Received 
    10
    Thanked in
    8 Posts

    Default

    Why do they blow up? What component makes the 'incompatibility'?

  3. #13
    Join Date
    Jul 2009
    Location
    Germany
    Posts
    3,638
    Thanks Thanks Given 
    6
    Thanks Thanks Received 
    64
    Thanked in
    58 Posts

    Default

    Smaller coil, less current on PFC Switchers, less current for PFC Diode.

    Either one of those parts.

  4. The Following User Says Thank You to Stefan Payne For This Useful Post:

    rgbodosk (1 Day Ago)

  5. #14
    Join Date
    Aug 2014
    Posts
    980
    Thanks Thanks Given 
    330
    Thanks Thanks Received 
    21
    Thanked in
    13 Posts

    Default

    Also the current rating on the bridge rectifier.

    Quote Originally Posted by rgbodosk View Post
    Then... I wonder why there are 'only 230V' APFC psus?
    💲

  6. The Following User Says Thank You to Orion For This Useful Post:

    rgbodosk (1 Day Ago)

  7. #15
    Join Date
    Oct 2006
    Location
    jonnyGURU forums, of course!
    Posts
    16,059
    Thanks Thanks Given 
    538
    Thanks Thanks Received 
    265
    Thanked in
    194 Posts

    Default

    Quote Originally Posted by rgbodosk View Post
    Then... I wonder why there are 'only 230V' APFC psus?
    What happends when just connecting that to the 110V powergrid(When assuming there is no UVP)? Insufficient component specs? And if(surely) something goes wrong, why that happends?
    Quote Originally Posted by rgbodosk View Post
    Why do they blow up? What component makes the 'incompatibility'?


    You haven't been paying attention much then.

    J/K...

    V * A = W.

    230V is half of 115V. What happens to your current when you cut the voltage in half, but demand the same amount of wattage? It doubles!

    What makes a component "more robust"? Double the voltage or double the current? Double the current.

    Remember, if you cut the voltage in half, the PSU isn't just going to automatically put out half as much power. Power supplies OUTPUT the load demanded of them. So say you had a static 500W load. If your PSU is less efficient, it pulls more power (watts) from the wall. If your power supply is more efficient, it pulls more power. So if the power is consistent, what changes when the voltage input goes down? The current.

    So if you cut the capability of nearly all of your primary side components IN HALF, what gain is there to the manufacturer? SAVINGS!!!!! $$$

  8. The Following User Says Thank You to Jon Gerow For This Useful Post:

    ehume (1 Day Ago)

  9. #16
    Join Date
    Oct 2006
    Location
    jonnyGURU forums, of course!
    Posts
    16,059
    Thanks Thanks Given 
    538
    Thanks Thanks Received 
    265
    Thanked in
    194 Posts

    Default

    Quote Originally Posted by Stefan Payne View Post
    Smaller coil, less current on PFC Switchers, less current for PFC Diode.

    Either one of those parts.
    Quote Originally Posted by Orion View Post
    Also the current rating on the bridge rectifier.
    Or... All of the above!

    230V only PSUs still have (now, in most countries) mandatory APFC. The ONLY reason to not have it auto switch for full range of inputs is to save money by cutting the components "strength" or "capability" in half.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •