AC → DC Power Supplies 'Fixed Voltage' ~75V 7A+ Manufacturers? - Page 1
Forum section: electronics / general

author: Chendy
author_rank: Contributor
timestamp: October 12, 2020, 03:47:44 pm
content: Hello,I'm looking to source 1,000+ AC → DC Power Supplies 'Fixed Voltage' of somewhere between 75V and 100V, current of 7A+. For integration in a product I'm working on. Voltage ripple doesn't have to be that great.Can anybody recommend any good value Manufacturers? I know of Meanwell, TDK Lambda. But any lesser known, cheaper but reliable brands? Perhaps far eastern.Especially forum guru insight. Such as 'Chinese company X is in fact the supplier/OEM for big-famous-brand-Y'.Thanks

author: tom66
author_rank: Super Contributor
timestamp: October 18, 2020, 11:59:11 am
content: Have you considered contacting Stontronics? A former employer used to buy through them, they handle the CE compliance/import aspect of buying in PSUs from the far East - I don't know if they do custom but I know we did have a dedicated 'variant' at least.An alternative is to source e.g. a 24V 800W PSU from a common supplier (like Meanwell) for a good price and design/build a boost converter board for it, I think you could make a passively cooled one (heatsink only) with the right parts now, and it wouldn't be that expensive. Probably less expensive than buying a custom PSU with a higher output voltage, in low volumes at least.

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: October 18, 2020, 12:30:33 pm
content: I'd think at that volume you may be able to find a manufacturer prepared to customize an existing design.Definitely worth talking to a local PSU distributor - in the UK, someone like Stontronics as mentioned above.Another option would be to use a pair of 48v units in series

author: Psi
author_rank: Super Contributor
timestamp: October 18, 2020, 12:40:11 pm
content: Have a look at powerstream, they have lots of psu available. Chances are pretty good they already have something close that they can easily tweak to get your specs.Flick them an email with your specs and qty and see what they come up with.https://www.powerstream.com/For the cheapest off-the-shelf solution with acceptable reliably you could look at two meanwell metal cage PSUs in series. like 2x48V@10A or something like that

author: pwrtrnx
author_rank: Newbie
timestamp: October 25, 2020, 12:26:44 am
content: we have used magnetpowernz ( . com ) for custom designs in the past, AC -> 75VDC @ 7A will be easy for them, 1000 off no worriesthey mainly do high reliability stuff... they do like a nice clear, fulsome spec thoughcheers.

author: opampsmoker
author_rank: Regular Contributor
timestamp: November 14, 2020, 09:43:05 pm
content: 2 CCM Boost PFCs in parallel......and then an open loop LLC converter with a fixed step down ratio.....that'll get you your 75-100v output, and very easily.Have one PFC controller and two FET/L/Diode stages...and switch from one to the other every 10ms to give you the heat handling capability....when you switch from one to the other...you wont get the zero crossing point abs right, so just have them both overlapping together near the zero cross , then switch the one stage out.Alternatively here is a 700w pfc module..https://www.synqor.com/products/pfcqor/pfcu390hpx07