SMPS EMI issues
in [Design]
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From: dbvanhorn on 4 May 2010 11:10 Is there someone on here who could share their experiences with a Bias Power BPS-1 module? They make some pretty impressive claims on their web site, "eliminates EMI without external filtering", but I am skeptical.
From: Martin Riddle on 4 May 2010 18:38 "dbvanhorn" <microbrix(a)gmail.com> wrote in message news:af28ceae-65e6-484d-8703-07fbf08b9f87(a)r34g2000yqj.googlegroups.com... > Is there someone on here who could share their experiences with a Bias > Power BPS-1 module? > They make some pretty impressive claims on their web site, "eliminates > EMI without external filtering", but I am skeptical. > I believe if you get the CE certification document, it will show what was required to pass the EMC tests. Cheers
From: legg on 4 May 2010 23:45 On Tue, 4 May 2010 08:10:06 -0700 (PDT), dbvanhorn <microbrix(a)gmail.com> wrote: >Is there someone on here who could share their experiences with a Bias >Power BPS-1 module? >They make some pretty impressive claims on their web site, "eliminates >EMI without external filtering", but I am skeptical. As with all supplies, you'll have to evaluate it in your application. EMC claims of class B compliance are for the stand-alone unit, with no indication of a ground wire connection. This will have to be accounted for in most applications, where as a minimum, an output contact may be unavoidable. In small power units, input to output capacitance may be very low. The claims for elimination of external filtering will apply to this stand-alone circuit. RL
From: krw on 4 May 2010 23:36 On Tue, 04 May 2010 22:45:31 -0500, legg <legg(a)nospam.magma.ca> wrote: >On Tue, 4 May 2010 08:10:06 -0700 (PDT), dbvanhorn ><microbrix(a)gmail.com> wrote: > >>Is there someone on here who could share their experiences with a Bias >>Power BPS-1 module? >>They make some pretty impressive claims on their web site, "eliminates >>EMI without external filtering", but I am skeptical. > >As with all supplies, you'll have to evaluate it in your application. > >EMC claims of class B compliance are for the stand-alone unit, with no >indication of a ground wire connection. This will have to be accounted >for in most applications, where as a minimum, an output contact may be >unavoidable. In small power units, input to output capacitance may be >very low. > >The claims for elimination of external filtering will apply to this >stand-alone circuit. > Not are the claims only good as a stand-alone unit, they're only applicable for the configuration tested (often full load into a resistor). We had serious problems with a wall wart that had alphabet soup ratings.
From: JB on 5 May 2010 00:40
"dbvanhorn" <microbrix(a)gmail.com> wrote in message news:af28ceae-65e6-484d-8703-07fbf08b9f87(a)r34g2000yqj.googlegroups.com... > Is there someone on here who could share their experiences with a Bias > Power BPS-1 module? > They make some pretty impressive claims on their web site, "eliminates > EMI without external filtering", but I am skeptical. We use the BPS-2-14-00 and will be using the BPS-0.5-14-00 in some of our designs. These BPS supplies require an external X2 100nF cap to meet the EN55015 specs and even then they only just scrape a pass. However a new design is currently in production as far as I'm aware which should improve matters. I'll be testing the the BPS-0.5 in a new design soon. I'll report back here if it's of interest. regds. JB |