Morsun power module capcitor selection - Page 1
Forum section: electronics / beginners

author: VEGETA
author_rank: Super Contributor
timestamp: April 04, 2024, 03:11:14 am
content: HelloI plan to use this power module:https://www.mornsun-power.com/html/pdf/LS15-23B12DR3.htmlthe thing i want to ask for is C1 which should be connected between pins 3 and 4. It shows a polarized capacitor and requires 450v rating, either 33u or 47u. My choice is an electrolytic of such ratings. it is very expensive compared to others too, even from LCSC.However, since it is on the AC side, won't this damage it being polarized?datasheet says:QuoteI also ran out of space but will manage to do it if I squeezed in a smaller footprint than 16mm diameter one.i could fit those:lelonNippon chemi-con-> can it be trusted to be new and ok from LCSC?CapXon--> i read here that it is a good brand. this cap fits specs.^ those are 47u, the 33u ones are noticeably cheaper.any recommendation?is my choice of elec. cap correct here?

author: Konkedout
author_rank: Frequent Contributor
timestamp: April 04, 2024, 04:05:15 am
content: C1 is not connected to AC voltage but rather appears to be filtering an AC voltage component of a DC voltage. This is probably the rectified output of the input bridge rectifier.This module is small and maybe does not have the internal room for all of the needed capacitors.They are recommending an electrolytic; I would try to follow their recommendation.Very roughly a 33 uF 450V electrolytic might be the size of my thumb. But that amount of capacitance and voltage in a film capacitor (not polarized) would be much larger.

author: dietert1
author_rank: Super Contributor
timestamp: April 04, 2024, 05:19:34 am
content: Interesting product with a nice datasheet. The size of the complete circuit will be bigger than the module for two reasons:1. At 15 W out the module will produce almost 3 W of heat.2. External parts: It's a mains connected circuit so better not fool around and implement application circuit 5 on page 6. I think the input resistor R1 is important, We have seen a lot of failures with those cheap chinese LED lamps because they omitted that resistor. The turn-on current can even destroy wall switches (contacts melted together).Regards, Dieter

author: VEGETA
author_rank: Super Contributor
timestamp: April 04, 2024, 01:39:43 pm
content: chosen components so far:CMC:RC212-0.5-10Mfuse:BK250-400-SZa bit higher than required?resistor:YAGEO PNP300JR-73-6R8x cap:PANASONIC ECQUAAF224Ky cap:TDK CD45-E2GA102M-VKAvaristor:Brightking 561KD14and big cap discussed here.what do you think?I tried implementing circuit 3 (indoor industrial). these components are on spec and still cheap from LCSC besides the CMC.

author: dietert1
author_rank: Super Contributor
timestamp: April 04, 2024, 02:18:42 pm
content: Mornsun recommend a different type of fuse. They write "slow-blow", but the PTC you found has a 9 second spec! Don't know if this protects against fire. For component failure (like rectifier short) you will rely on the existing mains fuse.

author: VEGETA
author_rank: Super Contributor
timestamp: April 04, 2024, 10:30:19 pm
content: Quote from: dietert1 on April 04, 2024, 02:18:42 pmI thought 9 seconds are good as "slow blow". I really want resettable fuse not regular one. I am open to recommendation for sure, so please do.holding current of 400mA is similar to max current recommended by the module, 800mA trip current is even less than they recommend which should be safer.

author: VEGETA
author_rank: Super Contributor
timestamp: April 07, 2024, 11:40:47 pm
content: I found this module:https://www.lcsc.com/product-detail/Power-Modules_HI-LINK-HLK-15M12C_C18203065.htmlnoticeably cheaper. what do you think? it does not require big cap

author: dietert1
author_rank: Super Contributor
timestamp: April 08, 2024, 04:33:34 am
content: If you look at fig. 8 on page 6 of the Hi-Link HLK-15MxxC datasheet, it resembles the Mornsun app. Fuse, primary filter and secondary storage cap are to be added. 83 % max efficiency and max inrush current of 34 A, about the same as 230 V / 6R8. One should get samples of both and compare them for reliability and EMI.Regards, Dieter

author: VEGETA
author_rank: Super Contributor
timestamp: April 08, 2024, 10:03:51 am
content: Quote from: dietert1 on April 08, 2024, 04:33:34 amfor this PSU desing, for sega saturn, i am still didn't really finish it. thus i could use hi-link but i want to make sure they are of good quality. as for emi and so on, i can put filters after it to minimize noise as i will get 2 buck regulators to give me 5v and 3.3v.I require low heat as well. very important for me