Power supply build quality pictorial. part 2

[Pentium4]

Re: Power supply build quality pictorial. part 2

My friend said he'd give me $40 for a reliable 300W PSU, so I grabbed this Pixxo out of the bin at work and recapped it. Can't figure out the OEM. It had Asia X capacitors, replaced them with good parts but I used 680uF Fhy on the primary. Sorry I didn't snap a pic but this PSU implements the Viper22A. I think this will work well for him. Double forward with 14A FET's, 30A on the minor rails and what looks like two 12V rails with OCP, each schottky at 20A. has a really quiet fan. Also, I added that wimpy heatsink to the bridge rectifier, just because it was lying around

[goodpsusearch]

Re: Power supply build quality pictorial. part 2

Looks very nice! Well done.

[PeteS in CA]

Re: Power supply build quality pictorial. part 2

Looks good for 300W, especially if it has a 120mm fan. 680uF may be conservative as I/P lytics, but the O/P caps might appreciate it.

[Pentium4]

Re: Power supply build quality pictorial. part 2

Looks very nice! Well done.

Thank you

Looks good for 300W, especially if it has a 120mm fan. 680uF may be conservative as I/P lytics, but the O/P caps might appreciate it.

It does have a 120mm fan, the brand is "Dong Guan Zhan Yu Industrial Company Limited" 12V @ 0.13A. But it's well oiled and surprisingly quiet, so I left it. I too thought 680uF on the input was a little generous but they only read 570uF so I assumed they were exaggerated 560's

[momaka]

Re: Power supply build quality pictorial. part 2

I like simple reliable designs. And this PSU looks like one. No SMDs on the underside, too - very good! (IMO)

[Behemot]

Re: Power supply build quality pictorial. part 2

Could use some heatshrink on the fuse and thermistor. You also forgot to add veristors, there are positions between the caps (that means they are on the potential between the caps, half the final DC voltage). Besides that seems OK for 300 W

[370forlife]

Re: Power supply build quality pictorial. part 2

Most Pixxo's are built by Key Mouse (K-MEX) but the ZU markings on the transformer and choice of Asia-X caps makes me thing Zumax, which is a lower-end subsidy of Topower.

[Pentium4]

Re: Power supply build quality pictorial. part 2

I like simple reliable designs. And this PSU looks like one. No SMDs on the underside, too - very good! (IMO)

It does look pretty reliable, and always glad to see no 2 transistor 5VSB The soldering looks pretty good as well for a low end unit.

Could use some heatshrink on the fuse and thermistor. You also forgot to add veristors, there are positions between the caps (that means they are on the potential between the caps, half the final DC voltage). Besides that seems OK for 300 W

I did see that. kaboom was saying something about having to add resistors in series with the varistors??

Most Pixxo's are built by Key Mouse (K-MEX) but the ZU markings on the transformer and choice of Asia-X caps makes me thing Zumax, which is a lower-end subsidy of Topower.

I thought Zumax just rebranded PSU's, do they possibly make their own? There looks to be a UL number on the bottom of the PCB that I can't find any info on. "E141940"

[dmill89]

Re: Power supply build quality pictorial. part 2

There looks to be a UL number on the bottom of the PCB that I can't find any info on. "E141940"

This is what comes back from the UL site: SHANDONG JINBAO ELECTRONICS CO LTD (Category Name: Polymeric Materials - Filament-wound Tubing, Industrial Laminates, Vulcanized Fiber, and Materials for Use in Fabricating Recognized Printed Wiring Boards - Component)

Looks like they are a company who makes printed circuit boards, so they probably made the PCB but sold it to someone else that made the PSU.

[Pentium4]

Re: Power supply build quality pictorial. part 2

Thanks for the info dmill

[goodpsusearch]

Re: Power supply build quality pictorial. part 2

HP PS-5341-4CF 340W (LiteΟn)

-Active PFC

-GBU808 8A bridge rectifier attached to heatsink

-Full input filter including MOV protection. 3X caps, 6 Y caps

-CM6800 PFC/PWM CONTROLLER COMBO

-2X STW14NK50Z. Those can be found in 450W psus, such as Thermaltake TR2-500

-2SK2611 for APFC

-5vsb uses DM311 IC or similar, couldn't read its markings because of the heatsink attached to it.

-Impressive primary and secondary heatsink

-Very good soldering

-3.3V: STPS3045CT (30A), 2x 6.3V 3300uF Taicon

-5V: 2X STPS3045CT (60A), 1x 2200uF 10V Ltec & 1x 10V 3300uF Taicon

-12V: MBR30H100CT (30A), 1x 16V 3300uF Taicon & 1x 16V 2200uF OST

-large 92mm 12V 0.30A Adda fan

The caps are a mix of OST, Taicon and Ltec. Not good, but not too bad.

[PeteS in CA]

Re: Power supply build quality pictorial. part 2

6 1/2 years old. Nice heavy metal, beefy semiconductors, -52 material O/P inductor. I'd say ditch the fan and any Ltec O/P caps, maybe also the +5V Aux and PWM start-up caps.

[Pentium4]

Re: Power supply build quality pictorial. part 2

That's a nice PSU! A little overbuilt which is always good. I bet that could do 400W continuous no problem. Of those caps that they used I'm glad they at least put Taicon on the 12V filtering. Yeah those are some nice thick heatsinks!

[japlytic]

Re: Power supply build quality pictorial. part 2

QJE PS3010 laboratory power supply (30V 10A - 300W) - a variant of an old-school TL494 design

680uF 200V x2 primary units.
2.2uF 630V poly for series current limiting of output transformer.
3300uF 35V before output inductor with 1000uF 35V x2 after it.
220uF 25V and 100uF 25V each on 5V and 12V control rails.

TL494 main controller with TNY277 output control supply controller.
KBU810 primary rectifier with KCH30A20 (200V 33.3A) output rectifier.
12N50 x2 primary side MOSFETs.
BU9793 LCD segment driver and PIC16F676 microcontroller.
All ICs and large rectifiers are from well-knowm manufacturers.

Heatsink (for primary power MOSFETs and output rectifier) behind board is generous.

Teardown video: http://youtu.be/-oT83k-z0vo

[Behemot]

Re: Power supply build quality pictorial. part 2

What's the status of those caps?

BTW, are you going to upgrade your avatar?

[Pentium4]

Re: Power supply build quality pictorial. part 2

Cooler Power GX850. Looks to be a CoolerMaster knock off. It isn't too bad, except that it's not an 850W. It made it up to 500W on the load tester before one of the two 12V rectifiers went out. Interestingly, though, I only had about 40A worth of 12V load. With a pair of 30A schottkys, I would have expected to be able to go a bit higher, even in forward topology. Maybe the fact that the PFC choke blocks almost all airflow off the secondary heat sink (and doesn't leave that grille space free) might have something to do with it. The secondary heat sink stayed too hot to touch long after the primary heat sink and other parts had cooled down. The caps are BH and GoldLink, and the fan is a 140mm Yate Loon Ball Bearing. Not bad for a no-name unit. I believe the OEM to be Golden Tiger.

When I fix it up, I'll replace the 12V schottky rectifiers with 40A parts.

I just realized this, I think that's the exact same as the Diablotek PHD650. I have one sitting in the shop, I'll post some pics later

[mariushm]

Re: Power supply build quality pictorial. part 2

QJE PS3010 laboratory power supply (30V 10A - 300W) - a variant of an old-school TL494 design

680uF 200V x2 primary units.
2.2uF 630V poly for series current limiting of output transformer.
3300uF 35V before output inductor with 1000uF 35V x2 after it.
220uF 25V and 100uF 25V each on 5V and 12V control rails.

TL494 main controller with TNY277 output control supply controller.
KBU810 primary rectifier with KCH30A20 (200V 33.3A) output rectifier.
12N50 x2 primary side MOSFETs.
BU9793 LCD segment driver and PIC16F676 microcontroller.
All ICs and large rectifiers are from well-knowm manufacturers.

Heatsink (for primary power MOSFETs and output rectifier) behind board is generous.

Teardown video: http://youtu.be/-oT83k-z0vo

Some constructive criticism...
* half the video was you unscrewing the thing. Some editing wouldn't hurt.
* too much movement... motion thickness is a thing. Grab a bunch of books, stack them, put camera on books and you've got yourself a tripod.

The TNY277 is probably used only for 5v for the microcontroller and lcd segment driver and actual lcd display.
The TL494 is doing the heavy work.

If i remember correctly, the big problem with those power supplies is that one panel can bend and touch the live heatsink.. check if fets are insulated from heatsink, check the earth wire and where is connected... etc

[Pentium4]

Re: Power supply build quality pictorial. part 2

Awesome Macron power supply. Looks good for at least 350W continuous. Has two 12V rails, and OCP on every rail. Last 3 pics are after recapping it

[c_hegge]

Re: Power supply build quality pictorial. part 2

Note the MPT-5002 model. That's actually a 500W, and not a half bridge one (2TF topology). Macron do usually seem to rate their PSUs accurately. Nice save!

[domas]

Re: Power supply build quality pictorial. part 2

Awesome Macron power supply. Looks good for at least 350W continuous. Has two 12V rails, and OCP on every rail. Last 3 pics are after recapping it

regarding picture 11: is it a temp sensor on a sink or is the sink grounded this way? A little blurry, can't see shit there


EDIT: oh there is a component marked TH2.. a thermistor nevermind