Commercial Switchmode PS: is there a spec that covers RFI suppression efficiency - Page 1
Forum section: electronics / beginners

author: nzo
author_rank: Regular Contributor
timestamp: April 17, 2013, 07:13:02 pm
content: If so, what terminology should I look for in the specs to ensure I get a PS that puts out the minimum of RF crap?IsWellForces- also trading asMean Wella reliable brand?Thanks!

author: qno
author_rank: Frequent Contributor
timestamp: April 17, 2013, 08:14:11 pm
content: look for UL or CE markings.

author: KJDS
author_rank: Super Contributor
timestamp: April 17, 2013, 09:02:47 pm
content: CE can mean Conformance European or China Export. The symbols are slightly different. Note also that a Chinese certificate of conformance usually only verifies that the issuer owns a printer.

author: Monkeh
author_rank: Super Contributor
timestamp: April 17, 2013, 09:04:46 pm
content: Quote from: KJDS on April 17, 2013, 09:02:47 pmThere's no such thing as a 'China Export' mark.

author: KJDS
author_rank: Super Contributor
timestamp: April 17, 2013, 09:36:24 pm
content: Quote from: Monkeh on April 17, 2013, 09:04:46 pmhttp://en.wikipedia.org/wiki/CE_marking#China_Export

author: Monkeh
author_rank: Super Contributor
timestamp: April 17, 2013, 09:41:38 pm
content: Quote from: KJDS on April 17, 2013, 09:36:24 pmQuote

author: c4757p
author_rank: Super Contributor
timestamp: April 17, 2013, 09:42:26 pm
content: Quote from: KJDS on April 17, 2013, 09:36:24 pmQuoteThe idea that they'd call it a "China Export" mark sounds kind of silly to me. They're often pretty bold about blatantly copying shit.

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: April 17, 2013, 10:17:08 pm
content: Quote from: nzo on April 17, 2013, 07:13:02 pmMean Well are generally good as Chinese suppliers go, but they do have a few dodgy products in their range.I generally prefer TDK-Lambda when quality & reliability counts more than minimum cost.

author: nzo
author_rank: Regular Contributor
timestamp: April 18, 2013, 12:15:51 am
content: The posts about what they do/don't do in China are interesting. However, can I therefore assume that all SMPS made in China (are there any not made there?) show no printed indication or standard of the efficacy of RFI suppression and that the whole show is just a bunch of techno lies and greed?

author: nzo
author_rank: Regular Contributor
timestamp: April 18, 2013, 06:56:01 am
content: And...in answer to my own question reWellForcesandMean Well- those areallChinese switchmode devices on their websites with no guarantee of electronic cleanliness. I spent some time on the phone with a guy from WellForces today and he was quite vague about their RFI/EMI specs.I told him the little story about Chinese SMPS designs and circuitsincludingsuppression components that were deliberately left out in the final manufacture, and that this was a widespread practice. His comment was that it rarely happened. Yeah right!Honesty in manufacture seems to have gone the way of US politics but what do I know.

author: David_AVD
author_rank: Super Contributor
timestamp: April 18, 2013, 07:51:15 am
content: I've seen an installation where a knock-off brand switch-mode power supply caused all sorts of grief. Interference to TV, modem, security camera, etc. They swapped it out for an equivalent model from Mean Well and all the problems were gone.