Power supply build quality pictorial. part 2

[Agent24]

Re: Power supply build quality pictorial. part 2

This single-transistor self oscillating design is crap. It should not be used in any electronic device, except for perhaps a classroom experiment.

Yeah it's kinda cool to see just how basic you can go with something like that

[goodpsusearch]

Re: Power supply build quality pictorial. part 2

Notice that it is the same model with this charger but they are different inside.

They never fail. I don't think they are so bad after all.

[momaka]

Re: Power supply build quality pictorial. part 2

They may not fail, but these single-transistor self-osc. designs have absolutely no feedback. I guess for a phone, that is okay since the phone does have some high quality internal regulators to charge the battery. Just don't try to use those chargers for anything else that requires a constant, stable voltage.
I'm still surprised Astec would build something like that, though. I have a bunch of old PSUs made by them, and they are all top-notch, high quality inside with all Japanese caps.

[Agent24]

Re: Power supply build quality pictorial. part 2

As far as I can see, the first one mariushm posted doesn't actually say Astec.

[japlytic]

Re: Power supply build quality pictorial. part 2

FSP FSP-300-60GHS

180uF 420V Teapo LH primary unit.
2200uF 16V OST RLS before +5VSB inductor with 1000uF 16V Suscon HG after it.
2200uF Teapo SZ before and after +3.3V inductor.
1000uF 16V Suscon HG before and after +5V inductor.
1000uF 16V Suscon HG before +12V inductors and on both +12V rails after each inductor.
1000uF 16V Suscon HG for -12V rail.

SDB30A40CT rectifier for +3.3V and +5V rails.
STPS30L45CT rectifier for +12V rail.
GBU606 primary side rectifier.

FSBH0270 IC for +5VSB.
FDP18N50 with BYC5-600 rectifier for PFC stage.
AOTF8N50 x2 for output stage.

[Agent24]

Re: Power supply build quality pictorial. part 2

An otherwise nice design let down by trashy capacitors.

[Shocker]

Re: Power supply build quality pictorial. part 2

Looks on par with the FSP250-60HEN...which isn't saying much. After a recap, I'd prefer this, or maybe even this, even though they have no PFC.

[c_hegge]

Re: Power supply build quality pictorial. part 2

Those heat sinks look awful

[Behemot]

Re: Power supply build quality pictorial. part 2

Yeah, as Fortron increses efficiency, they use smaller and smaller heatsinks.

[c_hegge]

Re: Power supply build quality pictorial. part 2

yeah, but they are still too small (unless that PSU is 80+ platinum, which I doubt very much)

[Behemot]

Re: Power supply build quality pictorial. part 2

That's why, despite general talk, their PSU's aren't really quiet

[b700029]

Re: Power supply build quality pictorial. part 2

Those heat sinks look awful

Agreed, I've seen much bigger heatsinks on stuff like L&C and Powmax...

[PCBONEZ]

Re: Power supply build quality pictorial. part 2

Those heat sinks look awful

Might look inadequate at first glance but it's really not.
.
FSP-300-60GHS is an SFX type and it's 80+.
20% of 300w is only 60w of heat to cool [for the whole supply at 100% load] and due to the reduced casing size the 80mm fan is basically right on the PCB.
That's a lot of air for a little guy..
.
Hardware Secrets tested this one and he had to do it at 39C because he couldn't get enough heat out of it to make the test box heat to 45C.
.
It looked like a good unit all the way around.
Shame on FSP for the crappy caps though.
.

[pdavid]

Re: Power supply build quality pictorial. part 2

Here is whats inside a nice AT Compaq PSU. I saved it from getting "recycled". The cover is all messed up with some brown goo...
It's a 150W unit; +5V 18A, +12V 4A, -5V .3A -12V .4A. There was almost no dust inside. I couldn't find out anything about the OEM but it sure has quality all over it. It works fine too.

[PCBONEZ]

Re: Power supply build quality pictorial. part 2

Here is whats inside a nice AT Compaq PSU. I saved it from getting "recycled". The cover is all messed up with some brown goo...
It's a 150W unit; +5V 18A, +12V 4A, -5V .3A -12V .4A. There was almost no dust inside. I couldn't find out anything about the OEM but it sure has quality all over it. It works fine too.

UL Number?

[Scenic]

Re: Power supply build quality pictorial. part 2

It says something in the first pic on the right edge of the board

G???EN PO??? (power?) SYSTEMS INC

[pdavid]

Re: Power supply build quality pictorial. part 2

UL Number?

I havent found any UL number on the label just comaq spare, part numebr and s/n. On the pcb its writen: GOLDEN POWER SYSTEMS and product of India. All I found was that it's a Compaq GPC150 4000K Power supply.

[PeteS in CA]

Re: Power supply build quality pictorial. part 2

Maybe it's OK with a helicopter grade fan, but my first reaction, just seeing the thumbnails, was, "Where's the beef?!"

The core of the O/P inductor has me curious. A Micrometals -26 core is painted yellow, with one side painted white. It's a very decent GP core, assuming it's sized right, the switch frequency isn't too high, and cooling is decent. A better choice is the -52 material, which, IIRC, is green body with one side blue - lower loss (less heat!), better for higher switch frequencies. That core looks to be black, with writing on it.

[pdavid]

Re: Power supply build quality pictorial. part 2

I really wouldn't like to rip apart that inductor The core is yellow, it's visable at the bottom where windings are less dense.

[PeteS in CA]

Re: Power supply build quality pictorial. part 2

Yeah, those coupled inductors - where most or all the O/Ps have windings on the one core - are not as simple as they seem. The number of turns and wire gauge for each winding, and the order in which the windings are wound are optimized so that the inductor helps with the regulation of the O/Ps that are not part of the main regulator loop. Sounds like the core is Micrometals -26 material, which has been standard for use in P/S since before 1980, when I started working with power supplies.