[time-nuts] SMPS or conventional?

[李]

When the Rb clock is working, it needs a high temperature, isn't heat dissipation breaking the heat balance?Increased power consumption？





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李
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邮箱bd4kc at 126.com
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On 10/23/2020 20:56, Bob kb8tq wrote:
Hi

I must admit, the longevity of the compressor based setup in the typical kitchen
fridge continues to amaze me. :).

=======

TEC’s have a fairly limited “pumping range”. It is not uncommon to discover you
need to stack them to get this or that job done. We wound up with a stack of
5 to get one project working.

In some designs the TEC / stack never does anything other than run at X current.
If the goal is “take care of an Rb out in the (-10 to +45C) garage”, it’s going to see
a lot of cycles …

Fun !!

Bob

> On Oct 23, 2020, at 6:29 AM, Poul-Henning Kamp <phk at phk.freebsd.dk> wrote:
>
> --------
>
>> TEC’s are indeed prone to wear out. That said, so is a compressor …..
>
> The mechanism is almost entirely mechanical and running a TEC at a
> stable current almost 100% mitigates it.
>
> The surefire way to force the wearout is to reverse the current
> direction a lot.
>
> Whatever you use to control the TEC, needs to understand that there
> is a 1:3 efficiency difference between the two directions, just
> slapping a PI(D) on a TEC is guaranteed to kill it.
>
> --
> 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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