While I was at Agilent in Spokane, one of the engineers or technicians claimed
that he had changed the RF characteristics of a 6-hole ferrite bead (wound with
2 1/2 turns) used on a power supply trace to a noisy assembly. The normal
current was about 1 amp, but he accidently shorted the power
Heat buildup in a ferrite is self-limiting. Once temperature reaches the
material's Curie point, it looses its magnetic properties, and heat buildup
essentially stops. Mind you, this temperature can be as high as 200°C for some
power ferrites, so it may get rather toasty.
There is no actual
Hi Chris:
We use similar circuits.
The circuit is an inverter powered from SELV. The
inverter output is hazardous voltage. Usually, the
output is floating, but not always.
The output MAY be hazardous energy ONLY IF the SELV
is hazardous energy. If the SELV is hazardous energy,
the
Hi Susan,
Your response makes it much clearer. Sorry about the Ferrites 101 in my
previous response. Hope I didn't insult your intelligence.
Now that I see the true nature of your question, I only have one tidbit to
offer from experience.
In one telecom circuit we had (starting from the
Sorry that I wasn't clear; I typically try to keep my questions general so
not to get too detailed about the specific application. And thanks to Bob,
Chris and Mike who have responded ... putting it into Chris's words ... I
was just trying to find out if ferrites had ratings to prevent them from
Hi all,
Historically, we have made products with CCFT (Cold Cathode Flourescent Tube)
Backlight for the Liquid Crystal Displays.
These backlight circuits run from SELV, usually 12VDC; and then they create
1000VAC @ 60Khz (typical). These circuits typically use a small transformer
with
Yes, we have experienced similar problems at some sites in Japan.
This is one of the reasons why we specify our power supplies (we buy
them in) to cover the range from 85 V.
Regards,
Neil Helsby
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