USB Syncroized 5V@8A power supply POL. Now Taking Orders!!! - Page 6

Beehphy · 01-25-2008, 02:31 PM

1/25/08...They’re Done!!!

I have finished the first run of 10 ACPPSv1 and the first run of USB Isolators. I am very pleased with how this all turned out. Most of the ACPPS were sold before construction was complete. The paint on the ACPPS looks good, especially since I’m not a painter. And the USB Isolators are smaller than I pictured in my head while I was designing them.

All the power supplies passed a 30 minute “burn in” outside their chassis, delivering 5A @ 5V to a 1 ohm resistor. They were checked for output voltage stability and operating temperature, to ensure everything is functioning correctly. Once assembled and in their chassis they were checked again for proper operation. All 10 passed with flying colors.

The USB Isolators were checked for shorts between wires before final assembly. I also performed USB flash memory speed tests using SiSoftware Sandra Lite XII.SP1 and actually showed a slight performance increase when the USB Isolator was being used (324ops/min with the Isolator, 319ops/min w/o). But those results are probably within the margin of accuracy. Never the less, the USB isolator does not impact USB2.0 performance. I would still suggest USB cable lengths are minimized when using it, since there may be some signal attenuation because of the extra connection.

In the next few days I will be writing a manual for the USB Isolator, but if you bought one with your ACPPS, here’s the skinny:

Plug the USB Isolator in at the computer, not after a hub.
The White/Grey wire is connected to the computers 5V USB supply. Use this as the enable signal for the ACPPS.
The Black wire is ground, connect it to the ground of the ACPPS. If your computers power supply is floating (not internally connected to ground) the ACPPS needs this as a reference to determine if the computer is on.
The Red wire is connected to the 5V line at the output of the USB Isolator. You can connect this to the ACPPS 5V output, or leave it unconnected. There is a diode with a ~0.15V drop between the input and output of the USB Isolator. Most USB devices will still operate if the 5V line is only 4.85V (they usually operate down to 4.5V).

If you power the red wire from the ACCPS output, it will not have a 0.5A current limit. So a hub after the USB Isolator *could* act like a powered hub (provide 0.5A to multiple ports) even if you are not providing it power through the barrel connector normally used to power it. Remember though, USB standard says there won’t be any more than 0.5A traveling through a cable, so the wires and connectors are spec’d as such. This application is purely experimental and I would suggest extreme caution if you plan to use the USB Isolator in this manner. I cannot test all possible hub/device/cable combination, so I’m not going to guarantee it will work, or your stuff wont break. This application is AT YOUR OWN RISK!!

If you want to order an ACPPSv1 there are 3 left, Send me a PM (or email) with your PayPal email address, and preferred shipping method. I’ll send you a PayPal bill within 24hrs. When you pay, PayPal will give me a verified address (then I’m covered) and I’ll ship the next business day.

dmistry · 01-25-2008, 03:11 PM

you have my email address from before can you bill me?

2k1Toaster · 01-25-2008, 03:11 PM

Very well done! They look very professional.

dmistry · 01-25-2008, 03:58 PM

thanks Bee got and paid the invoice can not wait to try it out!

Beehphy · 01-25-2008, 04:12 PM

Quote: Originally Posted by dmistry

thanks Bee got and paid the invoice can not wait to try it out!

I'll try to ship to you by this afternoon. Thanks for the quick payment.

Beehphy · 01-27-2008, 09:20 PM

Update 1/27/08

I tested the prototype ACPPSv2 today and got mixed results, but mostly positive. The prototype fuctions as designed thought it runs a little hot and noisy for my liking. I was able to get some early efficiency measurements at full output (12V@2A and 5V@5A).

Input power: 12V@5.12A=61.44W
Output power 1: 12V@2A=24W
Output power 2: 5V@5A=25W
Efficiency=(24+25)/61.44=79.75%

I was hoping for 85-90%, and with some part substitutions that might be possible.

Both transistor were running hot! Like cant hold you finger on it for more than a few seconds. that means the transistors were dissipating a lot of power (maybe 2-3W each) With bigger transistors that value should come down signifigantly. The transistors on the ACPPSv1 are warm to the touch but definately not hot.

also the outputs are noisier than I'm comfortable with. Maybe I can firm them up with a different ouput capacitor scheme. I'll be making some changes to the design and trying again soon.

miak69 · 01-29-2008, 07:20 AM

Are you located in America? Im in Australia and im fairly interested in ordering one of those little babies. Could you give me an idea of postage etc..

Thanks

Michael

Beehphy · 01-29-2008, 10:17 AM

Quote: Originally Posted by miak69

Are you located in America? Im in Australia and im fairly interested in ordering one of those little babies. Could you give me an idea of postage etc..

Thanks

Michael

Yes I am located in the US, Oregon to be exact.

I am currently working with someone in queensland, his shipping was ~$20 US for 7-10 day using the regular postal service. His total for a ACPPSv1, USBi, S/H was $110US.

UPS and FEDEX were $90-125 US and 2-day was the slowest option. Not really worth it, unless you need it FAST!!!

If your interested, send me an email (ACPPS@jopeldesigns.com)with your paypal email and shipping address and I'll get back to you promptly with a bill. I need your shipping address so I can accurately estimate the shipping costs.

I'll want the email address Paypal knows you by, so it's sent strait to your PayPal account. If you dont have a PayPal account I'll just use the one you write me with. If you dont have a PayPal account you can create one to pay the bill, or simply pay with a credit/Debit card. Very easy.

Hope to see your order.
Thanks,
Jesse

miak69 · 01-30-2008, 12:30 AM

Thanks for the quick reply,

Just so im sure, this has the 12v output that will power a lcd touch screen? My screen takes 12v 1.5A power. Sorry not very good with the electronics side of things. I know more about computers / software.

Michael

Beehphy · 01-30-2008, 12:54 AM

Quote: Originally Posted by miak69

Thanks for the quick reply,

Just so im sure, this has the 12v output that will power a lcd touch screen? My screen takes 12v 1.5A power. Sorry not very good with the electronics side of things. I know more about computers / software.

Michael

The ACPPSv1 has a regulated 5V and unregulated 12V output. I currently have 3 of therse left to ship before the next run.

The ACPPSv2 has regulated 12V and 5V outputs and an unregulated 12V output. This design is still in the development stage. A few post up I talk about testing the latest prototype with good results. Its not quite done though.

The v1 might work for you depending on your screen. if it can accept a range of input voltage there should be no problem using v1. If it is picky (12 only) I can't help you yet.

If you post what kind of screen you have I can research it and determine what it requires.
Jesse

bes51659 · 02-04-2008, 04:52 AM

Nice unit. I would have bought it if it had been around 2 years ago. Instead I bought two DC11

15W each was enough for my two hubs and the USB-DVD. $25 each at Opus, but then I still had not solved the problem of enable on/off.

(That I solved by use of an 8051 system that acctually do some more for me. I will put create a thread for that one when I'm 100% happy with the code and electrical interface. If you are interested in progress you can have a look at my site. A lot of tech stuff, but anyway)

So I think $80 is good value. That's what I wanted to say :-)

PacketSniffer · 03-24-2008, 10:27 PM

How's ACPPSv2 coming along? I'm interested in purchasing a unit.

Beehphy · 03-25-2008, 12:59 PM

Quote: Originally Posted by PacketSniffer

How's ACPPSv2 coming along? I'm interested in purchasing a unit.

Since the admin's moved my thread from hardware devlelopment to user inovations I haven't had any interest in either device. I actually haven't sold any in 2 months.

I was hoping profits from V1 sales would pay for V2 development.

I'll try to round up the $140 in the next couple weeks to make another V2 prototype and we'll see if the design is ready.

Beehphy · 04-11-2008, 12:21 PM

I have been hard at work updating and improving my designs. Have a look at the first post of this thread for more details.

I might be selling my PSU's through mp3car's online store soon!

I have redesigned V1 for a wider temperature range, ease of manufacturing and improved output charecteristics. And V2 got a selectabe secondary output (12, 18 or 19V) and hopefully higher efficency.

I am going to build new prototypes of both V1 r1.03 and V2 r0.03 very soon. Just though I'd give everyone, who's interested, an update.
J

Beehphy · 04-17-2008, 12:21 AM

I have ordered PCB's and parts for 2 prototypes of each of my designs.

V1 was changed drasticaly for the better. The layout was improved considerably and the circuit was improved for lower ripple (0.4% @ 25c, 2% @ -40C at full load) and opperating temperatures as low as -40 (for my peeps in Alaska). All these improvements require I build a prototype before it can go into production.

I'm quietly confident v2 wil be ready for production after testing. we'll see...

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