[time-nuts] float chargers for oscillator backup power
phk at phk.freebsd.dk
Mon Oct 27 07:32:57 UTC 2014
In message <6C69ADEB-A4D8-4DEE-A5D4-AEC0FD16490A at n1k.org>, Bob Camp writes:
>We seem to have drifted a bit.
>This started out as a supply for the Z3xxx Lucent GPSDO’s. [...]
Which, being telco material, is likely built to work exactly the way
I described: An unclean, unregulated DC bus, and an internal DC/DC
converter to clean it up and isolate it.
I thought we were talking 'naked' OCXOs.
One interesting setup I've seen, and which I'm contemplating next
time I renovate my DC supply is this:
* 30V power supply powers DC bus through diode.
* Battery, also diode to DC bus
* Bulk charger for filling up battery after discharge, turns once
current decreases to setpoint.
* Per battery DC/DC converters from the DC bus does float-charge.
The two main points to this is that you can use a heavy duty
bulkcharger, without paying for its losses in float-mode, and that
each battery (if you have more than one) gets optimal float-charge
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
phk at FreeBSD.ORG | TCP/IP since RFC 956
FreeBSD committer | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence.
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