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- making up zener diodes
November 21, 2009, 7:39 am
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Re: making up zener diodes
Very impressive. Not that I can think of another practical way to do
Another "series zener" application I was told of years back , is in
very long distance communication cables. (probably also undersea
submarine cables). In the example I was told of (a 300km land based
cable) in order to power all of the the many inline booster/repeater
boxes they had a single supply cable in the line that was connected to
+750vdc at one end and -750vdc at the other end. All the "booster"
boxes in the line would wired in series along this high voltage line
that was at 1500v potential end to end.
The earth would be the return.
At each box, they would put a zener diode in series with this high
voltage line and draw the unit's supply rail voltage from across this
zener. For example, if each box required 50v, and there were 30
boxes , there would be a total of 30x 50v zeners in series in the
(I cant remember exactly how many boxes were used, or the supply
voltage for each - just used these figures as an example)
Even with fibre optic cables being used these days, they more than
likely still need to be boosted every so many KM over long runs ? so
this method no doubt would still be used for powering boosters.
If series zeners are reliable enough for extremely critical
applications like undersea cables, then they are reliable enough for
pretty much anything as far as I'm concerned.
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