Power supply suggestions - Page 1
Forum section: electronics / projects

author: Red_Micro
author_rank: Regular Contributor
timestamp: June 18, 2021, 02:39:51 am
content: Is there a commercial solution for a Power Supply Input = 400VAC input (3 phase), Output = 36VDC, 2.2kW? From a design perspective, what topology is a fit for this requirement? Any literature is welcome.

author: bob91343
author_rank: Super Contributor
timestamp: June 18, 2021, 03:03:15 am
content: I presume you want an old school solution. A three phase transformer with appropriate rectifiers.The details can vary a lot depending on your specific need, but a Y - to Y set of transformers with full wave rectifiers should do it, although the ripple requirements may mean some hefty capacitors.See any textbook on AC circuits and/or transformers.

author: beanflying
author_rank: Super Contributor
timestamp: June 19, 2021, 07:53:51 am
content: Drop us a lot more detail first.Is this a test fixture for occasional use, casual short term usage (low duty cycle) or 100% duty cycle 36VDC @ circa 60A?What sort of spec do you need +-0.1VDC ok with a bit of ripple or do you need tight and a few mV and Linear/Low Ripple?Why three phase? Can you do it with split phase 220V (assuming you are on 110V?) instead?New or Secondhand?eBay auction: #264893002059just about bang on your rough spec. Several available in the USA it seems.

author: Terry Bites
author_rank: Super Contributor
timestamp: June 20, 2021, 09:22:59 pm
content: Three big car batteries? Meanwell RST-5000 series, seehttps://www.meanwell.com/productSeries.aspx?i=19&c=6#tag-6-19https://www.directindustry.com/industrial-manufacturer/ac-dc-power-supply-117949.html?originalFilter=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 your own values,

author: sandalcandal
author_rank: Unknown
timestamp: June 21, 2021, 03:21:34 pm
content: Do you really need 3 phase for only 2.2kW?Modern high efficiency designs would use a WBG totem-pole PFC into a high efficiency DC-DC converter, mostly LLC it seems like these days.Here's a reference design in your ball park:https://www.infineon.com/cms/en/product/evaluation-boards/eval_3kw_50v_psu/

author: penfold
author_rank: Frequent Contributor
timestamp: June 21, 2021, 07:53:39 pm
content: Quote from: Red_Micro on June 18, 2021, 02:39:51 amThey are not common. In a chassis mount unit, 2.2 kW doesn't really give much incentive to add the cost and space consumption of a three-phase front end. XP Power makes some three-phase unitsLike thesebut not at your voltage spec.(assuming youneedthree-phase, say for avoiding unbalance on a small power system), you could perhaps connect three single-phase units so long as their outputs allow parallel operation.Quote from: Red_Micro on June 18, 2021, 02:39:51 amFor the front-end, PFC stage, you can use one single-phase PFC per phase if you have a neutral, a Vienna rectifier can be quite suitable (not entirely intuitive to control though) or a three-phase IGBT/MOSFET-bridge boost converter. The DCDC bulk power conversion part would probably be good with a phase-shifted bridge with probably a push-pull secondary can work well, relatively simple to design and easy to control... other approaches can be more efficient.