XPost: alt.comp.hardware.pc-homebuilt, alt.comp.os.windows-10   
   From: nospam@needed.invalid   
      
   On Sat, 5/3/2025 6:43 PM, Ivano Rossi wrote:   
   > On Sat, 3 May 2025 17:04:01 -0500, Paul in Houston TX wrote:   
   >   
   >>>> Google:  Hyundai laptop power supply   
   >>>>   
   >>>> 12V, 2A   
   >>>   
   >>> That will only work if the company makes only one laptop power supply.   
   >>> Does it?   
   >>   
   >> IDK.  However, if you search the internet, including the Hyundai   
   >> website, you will only find the 12V, 2A or 3A models.   
   >   
   > Isn't 12 volts far too low for any modern laptop power supply?   
   > Aren't they usually around 20 volts?   
   >   
      
   They have to be high enough to charge the battery pack cheaply.   
   Like, with a buck converter.   
      
   A battery pack running between 14.4V and 16.8V, could likely   
   be charged from a 19V source. That might work.   
      
   A battery pack operating at 7.2V to 8.4V could be operated from a 12V source.   
   You would just put more chains in parallel (like a 2S3P or   
   a 2S4P pack) to get more watt-hours to compensate for the lower   
   voltage. Equalizing the charge might be more of a problem.   
      
   A disadvantage of doing this, is the SMPS for VCore is likely   
   less efficient. A higher voltage would work a bit better.   
      
   I would guess the engineer looked at the BOM cost, and made   
   that the number one priority. The 12V 2A adapter is a common   
   item for external 3.5" HDD enclosures. They have a spec like that,   
   with an unstated spec of allowing a bit more current for a few   
   seconds, without the current limiter cutting out. The HDD   
   adapters aren't exactly 12V @ 2A, cutting out at 2.000 A. They   
   should be able to deliver a bit more current, on demand. This adapter   
   won't have an opportunity to demonstrate that, but the design   
   may just be a HDD wall adapter with a slightly different skin.   
      
      Paul   
      
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