3 ms·

They do help. Since HN finds it interesting I can write some on the most modern designs. I am currently designing a FOSS power supply. One of the goals is to go

by R0b0t1 5y ago

They do help. Since HN finds it interesting I can write some on the most modern designs. I am currently designing a FOSS power supply. One of the goals is to go for high efficiency. The end product will use GaN and SiC elements. The different chemistries give different switching characteristics. (Interesting aside is that some topologies can run forward as line conditioning AND backwards as a motor inverter.) There are also supply chain and security considerations, though. You can buy magic PSU chips but what if you can't?

Scene_Cast2 5y ago
Oh neat, sounds pretty cool. Is there a hackaday project page or similar? Is it an ATX PSU or something else? And I'm not up to date on modern electrical design, but a satellite-view on industry innovations & trends would be interesting.
- R0b0t1 5y ago
  Goal is to make it [optionally] smart, compact, modular, and ATX compatible. Hopefully with just the newer 12V standard. My original motivation for the project was lack of SMBus/PMBus support on desktops (on a laptop, it's the battery controller that allows you to see power usage). I'll make a Hackaday page. So far I've got: https://www.patreon.com/sidspry https://www.patreon.com/sidspry https://opencollective.com/sidspryfoss https://opencollective.com/sidspryfoss I just started putting myself out there. I have material queued up that I need to edit and I need to pick out the good parts for blog posts. I've started acquiring components for the prototypes. Sadly it's slow going, HW prototyping is kind of expensive for me right now. My design progress is way ahead of what I've actually documented and I need to start documenting so it looks better.
  - daper 5y ago
    After some searching I've found that Supermicro is selling ATX power supplies with SMBus (hopefully PMBus really) connection in reasonable price but never had one and I'm not able to find any review. Example: https://store.supermicro.com/865w-atx-pws-865-pq.html https://store.supermicro.com/865w-atx-pws-865-pq.html
zokier 5y ago
I'm kinda surprised there would be still significant margin in improving efficiency, considering that modern top tier PSUs are already 90-95% efficient
- R0b0t1 5y ago
  You are right, power supply improvements are asymptotic. It's not just about total efficiency, but also about how the heat is generated and where you can put it. A lot of the newer developments don't do a lot for total efficiency but produce smaller supplies by more efficiency managing heating. That said, most supplies for sale are based on old, fossilized designs created ~10 years ago, hovering at around 80%. If you spend more you can get the gold, titanium, etc. But then, even those tend to be below the maximum you can get, which is closer to 98% if you have information about your load. You can also design the system to have better efficiency at various loads. Typically half, but could be worth tracking newer CPU/mobo/GPU developments.
- rcxdude 5y ago
  The big improvement is you can get the same performance in a smaller space. This either lets you go more efficient (and the difference between 90% and 95% efficient is halfing the amount of heat to get rid of) in the same space or smaller for the same efficiency.

by R0b0t1 5y ago

Scene_Cast2 5y ago

Oh neat, sounds pretty cool. Is there a hackaday project page or similar? Is it an ATX PSU or something else? And I'm not up to date on modern electrical design, but a satellite-view on industry innovations & trends would be interesting.

R0b0t1 5y ago
Goal is to make it [optionally] smart, compact, modular, and ATX compatible. Hopefully with just the newer 12V standard. My original motivation for the project was lack of SMBus/PMBus support on desktops (on a laptop, it's the battery controller that allows you to see power usage). I'll make a Hackaday page. So far I've got: https://www.patreon.com/sidspry https://www.patreon.com/sidspry https://opencollective.com/sidspryfoss https://opencollective.com/sidspryfoss I just started putting myself out there. I have material queued up that I need to edit and I need to pick out the good parts for blog posts. I've started acquiring components for the prototypes. Sadly it's slow going, HW prototyping is kind of expensive for me right now. My design progress is way ahead of what I've actually documented and I need to start documenting so it looks better.
- daper 5y ago
  After some searching I've found that Supermicro is selling ATX power supplies with SMBus (hopefully PMBus really) connection in reasonable price but never had one and I'm not able to find any review. Example: https://store.supermicro.com/865w-atx-pws-865-pq.html https://store.supermicro.com/865w-atx-pws-865-pq.html

zokier 5y ago

I'm kinda surprised there would be still significant margin in improving efficiency, considering that modern top tier PSUs are already 90-95% efficient

R0b0t1 5y ago
You are right, power supply improvements are asymptotic. It's not just about total efficiency, but also about how the heat is generated and where you can put it. A lot of the newer developments don't do a lot for total efficiency but produce smaller supplies by more efficiency managing heating. That said, most supplies for sale are based on old, fossilized designs created ~10 years ago, hovering at around 80%. If you spend more you can get the gold, titanium, etc. But then, even those tend to be below the maximum you can get, which is closer to 98% if you have information about your load. You can also design the system to have better efficiency at various loads. Typically half, but could be worth tracking newer CPU/mobo/GPU developments.
rcxdude 5y ago
The big improvement is you can get the same performance in a smaller space. This either lets you go more efficient (and the difference between 90% and 95% efficient is halfing the amount of heat to get rid of) in the same space or smaller for the same efficiency.