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Re: No More USB-A Ports

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On 2024-06-16, Computer Nerd Kev wrote:
> Dan Purgert <dan@djph.net> wrote:
>> On 2024-06-08, Computer Nerd Kev wrote:
>>> The USB-PD standards are interesting. Upon first reading about them
>>> I was keen to find/design a device to just break out the outputs
>>> and have a mini variable power supply for general use, even battery
>>> powered from one of those power bank devices. But as with most
>>> things USB3/C it turns out the power supplies that are actually
>>> available only implement the bare minimum range of voltage outputs
>>> that the manufacturers think most people will need.
>> 
>> Mine here are all 5/9/15/20V.  I "think" they're missing only 1 or 2
>> voltages, but that's enough for my laptops and cell phones.  Not really
>> sure what'd ask for 9 or 15 volts ... 
>
> 9V plugpacks are pretty common for stuff I use, it's typical for
> devices that reduce that to 5V internally. Similarly 5V devices
> generally use 3.3V internally. My laptop's power supply is 16V, so
> 15V might work.

Not sure what a "9v plugpack" is -- maybe something leaning a little
more "professional grade", like what photographers tend to carry about?
All of my "5v(tm) devices" are certainly running lower voltages inside
-- batteries are only 3.7 to 4.2 volts (or thereabouts) anyway, and I
know my phone has a lot of 1.8 volt things inside.

I was more saying that I couldn't really think of anything that'd take
the middle voltages, given what I'm familiar with.

>
> But really what excited me were the newer PPS power supplies (USB-C
> 3.0 PD PPS, to use their full title). These are supposed to supply
> a requested voltage in 20mV steps between 3.3V and 21V+. The idea
> is to allow optimised battery charging by supplying a charge
> voltage/current specific to the state of charge that the battery is
> in. I just liked the idea of completely universal plugpacks, but
> when I went shopping for them (and granted they're quite new to the
> market in Australia) the models on offer had a much more limited
> voltage/current range.
>
>> Bear in mind that it's ONE output, and you negotiate the voltage on the
>> wire as part of the connection handshaking (IIRC CC1/2 or maybe
>> something more active later on, been a bit since I read up on how PD
>> works)
>
> Yes it's all rather complicated, but in theory a device to allow
> manual control of the output could be quite cheap because there
> are chips designed for doing that in relatively dumb USB-C-powered
> devices. However I found a project online from someone who'd tried
> making a bench power supply adapter from a wide-range USB-PD PPS
> power supply and they found the outputs were so far off what was
> requested that they ended up setting it to a fixed output and used
> another regulator for the final output. So not using the voltage
> programming ability of the USB power supply after all. I realised
> then that I was probably wasting my time - it's a standard for a
> perfect power supply, which might only be used to make
> barely-good-enough-to-sell power supplies. I shouldn't really have
> been surprised.

Happen to have a link to the project?  Or was it something you came
across ages ago?

-- 
|_|O|_| 
|_|_|O| Github: https://github.com/dpurgert
|O|O|O| PGP: DDAB 23FB 19FA 7D85 1CC1  E067 6D65 70E5 4CE7 2860

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No More USB-A Ports Lawrence D'Oliveiro <ldo@nz.invalid> - 2024-06-08 02:21 +0000
  Re: No More USB-A Ports "v55" <alittlespam@arandommailserver.tk> - 2024-06-07 23:46 -0400
  Re: No More USB-A Ports "v55" <alittlespam@arandommailserver.tk> - 2024-06-07 23:46 -0400
    Re: No More USB-A Ports Jan van den Broek <balglaas@dds.nl> - 2024-06-08 08:11 +0000
  Re: No More USB-A Ports "v55" <alittlespam@arandommailserver.tk> - 2024-06-07 23:46 -0400
  Re: No More USB-A Ports "v55" <alittlespam@arandommailserver.tk> - 2024-06-07 23:46 -0400
  Re: No More USB-A Ports "v55" <alittlespam@arandommailserver.tk> - 2024-06-07 23:46 -0400
  Re: No More USB-A Ports candycanearter07 <candycanearter07@candycanearter07.nomail.afraid> - 2024-06-08 06:10 +0000
    Re: No More USB-A Ports mm0fmf <none@invalid.com> - 2024-06-08 09:29 +0100
      Re: No More USB-A Ports "v55" <alittlespam@arandommailserver.tk> - 2024-07-03 22:08 -0400
        Re: No More USB-A Ports candycanearter07 <candycanearter07@candycanearter07.nomail.afraid> - 2024-07-04 14:30 +0000
  Re: No More USB-A Ports not@telling.you.invalid (Computer Nerd Kev) - 2024-06-09 09:08 +1000
    Re: No More USB-A Ports Dan Purgert <dan@djph.net> - 2024-06-16 13:03 +0000
      Re: No More USB-A Ports not@telling.you.invalid (Computer Nerd Kev) - 2024-06-17 08:41 +1000
        Re: No More USB-A Ports Dan Purgert <dan@djph.net> - 2024-06-17 12:00 +0000
          Re: No More USB-A Ports Rich <rich@example.invalid> - 2024-06-17 15:44 +0000
          Re: No More USB-A Ports Theo <theom+news@chiark.greenend.org.uk> - 2024-06-17 17:37 +0100
          Re: No More USB-A Ports not@telling.you.invalid (Computer Nerd Kev) - 2024-06-18 09:33 +1000
            Re: No More USB-A Ports Dan Purgert <dan@djph.net> - 2024-07-03 12:49 +0000
  Re: No More USB-A Ports Blue-Maned_Hawk <bluemanedhawk@invalid.invalid> - 2024-06-09 22:11 +0000
  Re: No More USB-A Ports Anssi Saari <anssi.saari@usenet.mail.kapsi.fi> - 2024-06-10 10:18 +0300
    Re: No More USB-A Ports Lawrence D'Oliveiro <ldo@nz.invalid> - 2024-06-10 07:22 +0000

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