Low profile SMPS - Page 1
Forum section: electronics / projects

author: tszaboo
author_rank: Super Contributor
timestamp: November 28, 2017, 10:16:35 am
content: Does anyone know of any 110-230VAC input SMPS, which can fit into a 1 module width DIN rail mounted box?1 module width is 18mm, so after the box, there is about 16mm left. The other dimensions are about 35mm and 44mm. If the power supply is "high, narrow", like a SIP module, then the PCB is horizontal. But if the power supply is "low profile, wide" than I have even less than 16mm.I would need 1-3W, preferably isolated. It has to be EC, RoHS and UL, probably TÜV would be nice.I've disassembled a bunch of devices, which are this size, all of them seem to run their own SMPS. Which I would like to avoid as much as possible. Since there are USB chargers this size, this should be possible.

author: Twoflower
author_rank: Frequent Contributor
timestamp: November 28, 2017, 11:00:39 am
content: Do you need any additional space for any other circuit in it? If not, how about these: (as you haven't specified the voltage I also grabbed the first one I found):https://www.reichelt.de/Schaltnetzteile-fuer-Hut-Schiene/MW-HDR-15-12/3/index.html?ACTION=3&GROUPID=4961&ARTICLE=202991&START=0&OFFSET=16&SID=92WV-ah6wQATQAAAN6l5E5de9c8bfb379c7d08b54848c09860031&LANGUAGE=EN

author: daqq
author_rank: Super Contributor
timestamp: November 28, 2017, 11:13:36 am
content: There seems to be quite a few:http://uk.farnell.com/w/c/power-line-protection/power-supplies/ac-dc-converters/pcb-mount-converters-ac-dc?height=11.1mm|12.7mm|13.4mm|14.5mm|14mm|15.16mm|15.24mm|15.2mm|15.65mm|15mm|16mm

author: tszaboo
author_rank: Super Contributor
timestamp: November 28, 2017, 12:19:48 pm
content: Quote from: daqq on November 28, 2017, 11:13:36 amMost of these are 15-16mm. I need to mount it on a vertical PCB, which is additional 1.6mm + clearances + Through hole soldering on bottom . And when I said 16mm I realized, I was quite generous, the horizontal PCB is 14.7mm wide.Quote from: Twoflower on November 28, 2017, 11:00:39 amI am using these Meanwell supplies. The intention is to make self contained units, as small as possible. This is for big production, engineered to cost. The Meanwell IRM-02 and others fit into 2 module width anyway.

author: daqq
author_rank: Super Contributor
timestamp: November 28, 2017, 05:20:55 pm
content: QuoteA few of the devices listed on farnell are 14mm or less in height, a few are even 11mm. If you need anything less than that, well, you will probably have to roll your own... or maybe you can find something not switched in that height? A low power 50Hz low profile transformer?

author: tszaboo
author_rank: Super Contributor
timestamp: November 28, 2017, 05:53:40 pm
content: Quote from: daqq on November 28, 2017, 05:20:55 pm11-12mm is Recom 3W no longer manufactured and Vicor 300W versions.14mm doesnt fit the box.14mm+1,6mm PCB + through hole pin + clearance is more than 16mm.I dont know about the 50Hz transformer. I'll take a lokk at it tomorrow.

author: Nauris
author_rank: Regular Contributor
timestamp: November 28, 2017, 07:11:14 pm
content: Quote from: NANDBlog on November 28, 2017, 05:53:40 pmI have searched some time ago but haven't found that small. If isolation is not absolutely required, then there is the capacitive dropper

author: SeanB
author_rank: Super Contributor
timestamp: November 28, 2017, 07:35:43 pm
content: You do get 50Hz transformers that fit a 1 DIN wide box, but they probably are 1VA5 only, as I have some Pt100 controllers with them. Tiny, and type approved as well.There must be some 1 DIN wide power supplies though, but i guess most will be 24VDC at 0.5A I would guess.

author: daqq
author_rank: Super Contributor
timestamp: November 28, 2017, 07:37:10 pm
content: QuoteSome of the DIN boxes require a 1mm thick PCB - seehttps://cdn.sos.sk/productdata/28/3a/b41acb7f/cem17-gy.pdf

author: mariush
author_rank: Super Contributor
timestamp: November 29, 2017, 04:59:26 am
content: You could always go for extremely inefficient digital isolators likeAdum5000(500mW 5v to 5v with 33% efficiency) put 2 or more in parallel and you got your 1w or more. Capacitive dropper or something on the primary ..

author: T3sl4co1l
author_rank: Super Contributor
timestamp: November 29, 2017, 06:48:14 am
content: I've certainly seen PSUs twice that width, and maybe DC-DC isolators smaller, unsure. Have you went shopping for one, ready made?Pretty sure there are PSU modules that small, too, if you want to semi-roll your own.Tim

author: floobydust
author_rank: Super Contributor
timestamp: November 29, 2017, 08:06:49 am
content: I did a teardown of same size Phoenix Contact DIN-rail SMPS, and the caps are bent over and the transformer is the tallest part. If you are designing one, there are many low profile ferrite transformers out there.Arch power supplies Taiwanhas some small modules 15.4mm; What temperature range, quality etc. are you looking for? Don't forget the pins, PCB and interconnect wiring also eats up some room. Arch stuff is basic in quality. Hard to find UCC or Nichicon in there, lol.

author: tszaboo
author_rank: Super Contributor
timestamp: November 29, 2017, 09:36:40 am
content: Quote from: daqq on November 28, 2017, 07:37:10 pmThe drawing said: PCB THICKNESS= 1,6 +/- 0.1 mmQuote from: mariush on November 29, 2017, 04:59:26 amADUM would skyrocket the price. I would rather use those isolated DC-DC converters.Quite frankly, I would like to avoid capacitive dropper. I think it is a hack-job, not a proper power supply. And I dont want to run into troubles, like the thing expoding, if you set a different setting on the radio power amplifier.Quote from: floobydust on November 29, 2017, 08:06:49 amI'm not designing a power supply, it is needed for the internal electronics. It is a wireless smart meter. RG. Something that you connect to your electricity meter, and collect the pulses and send it to the cloud.But actually they want smart relays and other product built in this form factor.Quote from: SeanB on November 28, 2017, 07:35:43 pmCan you tell the part number/manufacturer, please?

author: tszaboo
author_rank: Super Contributor
timestamp: November 29, 2017, 12:09:50 pm
content: I've found some CUI power supplies, that would fit. They integrate less, than I would like to. Let's see how expensive they are. This is a 3W supply. It needs the input cap, CLC filter on the output, fuse, and the Y rated cap.http://www.cui.com/product/power/ac-dc-power-supplies/board-mount/pbk-3-series

author: daqq
author_rank: Super Contributor
timestamp: November 29, 2017, 01:16:50 pm
content: Nice find with those CUI modules!QuoteSee attachement.

author: tszaboo
author_rank: Super Contributor
timestamp: November 29, 2017, 04:10:45 pm
content: Quote from: daqq on November 29, 2017, 01:16:50 pmWe are exclusively using Italtronic boxes.