DC to DC converter DPS5020 - Page 1
Forum section: electronics / beginners

author: Charlie86
author_rank: Regular Contributor
timestamp: February 03, 2018, 09:01:35 am
content: Hi,I want to build power supply from DPS5020, but I am not sure what kind of transformer should I use for it. I have at home power supply with 13,8V 10A output which one I do not need and few laptop power supplys, one of them is old Dell with 19V and 6A. Is there any way to increase output voltage of those power supplys so they can be part of my new project?Thanks

author: llkiwi2006
author_rank: Regular Contributor
timestamp: February 03, 2018, 09:17:30 am
content: What is your desired output voltage (or voltage range) and maximum current?

author: Charlie86
author_rank: Regular Contributor
timestamp: February 03, 2018, 09:42:19 am
content: Hi,30V (or more) and 5A would be OK.

author: ocset
author_rank: Super Contributor
timestamp: February 03, 2018, 10:35:34 am
content: you can build yourself a boost converter to boost up to >30vBut be careful as above 60V and you can give bad shock, even if isolated.Specially if you toch it with both hands.I mean, i attach a simple booster simulation. (its actually a flyback though)That DPS5020 thing is an interface to a adjustable psu i believe.(?)As you know, the way to build an adjustable vout power supply is to have an external error amplifier...and instead of a fixed reference to the error amp, you need to make the reference adjustable so your vout can change....presumbaly that dps5020 can give you this variable reference.(?)If you want to use the dps5020 with a different psu than the one that comes with dps5020, then you need to find where that adjustable ref voltage is so you can use it.Attached is an LTspice sim of an adjustable smps, demo'ing the principle......if you want to make any psu variable out...then you need access to the error amplifier's ref voltage

author: paulca
author_rank: Super Contributor
timestamp: February 03, 2018, 12:54:30 pm
content: I run my 5020 on one of these. A 48V 10A one. Works fine. You can of course get 20A at 24V or below, though I think I've only tested 20A at 12V once.(Obviously check the DC brick will support your local mains)https://www.ebay.co.uk/itm/AC-220V-to-DC-5V-12V-24V-48V-Switching-Power-Supply-Driver-Transformer-Adapter/391782456678?hash=item5b380ddd66:m:mmVw_bDwWvLj0RwTzdwygGw

author: Charlie86
author_rank: Regular Contributor
timestamp: February 03, 2018, 11:19:52 pm
content: This one you linked is nice, only problem is very unsecure input and output. Is there any good housing for it?DC to DC coverter will be inhttps://www.aliexpress.com/item/RD-DPS5015-DPS3012-DPH3205-Power-Supply-housing-Constant-Voltage-current-casing-digital-control-buck-Voltage-converter/32794029335.html?spm=2114.search0104.3.14.5ff2772eaeVHs0&ws_ab_test=searchweb0_0,searchweb201602_3_10065_10344_10068_10342_10343_10340_10341_10084_10083_10618_10304_10307_10301_5722316_10313_10059_10534_100031_10103_441_10624_442_10623_10622_10621_10620_10142,searchweb201603_2,ppcSwitch_5&algo_expid=9de86d05-afb4-470e-b83a-64825b3b82b4-1&algo_pvid=9de86d05-afb4-470e-b83a-64825b3b82b4&priceBeautifyAB=0

author: paulca
author_rank: Super Contributor
timestamp: February 04, 2018, 08:56:15 am
content: Unfortunately no. There is a little plastic cover on mine, that snaps down over the terminals, but it's not exactly "safe", definitely not child safe. There is exposed mains only a curious finger away from death.They are designed for installation into floor/ceiling space to run LEDs and 12V lights in houses.You could make a case.Other options are ATX PSUs. However for that you'll need a boost converter or you will be stuck with 11.xV. RD Tech do a Boost/Buck version but it's only rated to 5A (I'm sure they will up that with time).Server rack power supplies can give you 50V and 10-20A but they are LOTs of money.A Laptop brick (second hand) if you shop around I got one that produces 19V and 6.5Amps.For the full 48/50V you don't have many options that don't cost a fortune. Thus you are probably better using the LED lighting brick and buying an enclosure for it.

author: paulca
author_rank: Super Contributor
timestamp: February 04, 2018, 09:00:34 am
content: You could run this off an ATX PC Power supply no problem:I got one this week and run it off a 12V battery. It's limited to 5A though. Uses the same case as you linked.https://www.aliexpress.com/item/RD-DPH5005-Buck-boost-converter-Constant-Voltage-current-Programmable-digital-control-Power-Supply-color-LCD-voltmeter/32840324731.html?spm=2114.search0104.3.1.2439c699vZpSiC&ws_ab_test=searchweb0_0,searchweb201602_4_10065_10344_10130_10068_10324_10342_10547_10325_10343_10340_10548_10341_10192_10190_10084_10083_10618_10307_10301_10303_5722315_10313_10059_10184_10534_100031_10103_441_10624_442_10623_10622_10621_10620_10142,searchweb201603_40,ppcSwitch_7&algo_expid=e8b341a8-7322-4d11-8d88-45f9b1d86fe3-0&algo_pvid=e8b341a8-7322-4d11-8d88-45f9b1d86fe3&transAbTest=ae803_5&priceBeautifyAB=0

author: ChrisLX200
author_rank: Unknown
timestamp: February 04, 2018, 10:00:12 am
content: Quote from: Charlie86 on February 03, 2018, 09:01:35 amI bought one of these 50v board supplies to power my 5015http://www.ebay.co.uk/itm/800W-50V-LLC-Soft-Switching-Power-Supply-high-quality-HIFI-amp-PSU-board-DIY/192325585960?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2060353.m2749.l2649I've been waiting a month though and still no delivery. It will need a case of course - and a fan I expect.

author: Charlie86
author_rank: Regular Contributor
timestamp: February 04, 2018, 01:55:37 pm
content: Any idea where can I buy case like that?http://cxem.net/pitanie/5-341.phpThis one looks perfect for me.

author: paulca
author_rank: Super Contributor
timestamp: February 04, 2018, 04:19:20 pm
content: Quote from: ChrisLX200 on February 04, 2018, 10:00:12 am... and hopefully not a smoke extractor! Chinese bare board modules are grand. Mains DC power supplies are grand. Chinese bare board mains DC PSU modules... no thanks.

author: ChrisLX200
author_rank: Unknown
timestamp: February 04, 2018, 06:41:34 pm
content: Quote from: paulca on February 04, 2018, 04:19:20 pmJust about everything's Chinese! Your mains DC PSU is just a Chinese PCB in a perf Chinese ally boxAll are made as cheaply as possible, none are without potential fault. I've got two PSUs in my observatory which need to be reliable, they're not Chinese...