[time-nuts] SMPS or conventional?

[Bob kb8tq]

Hi

There are two “zones” in the typical Rb physics package. They both need to be heated. Unfortunately they need
to be heated to *different* temperatures. This makes for an interesting design. Insulate things to well and the one
that is supposed to be at a slightly lower temperature is heated up by energy from the hotter zone. In addition, the 
board with all the electronics on it ( or boards) are full of very normal electronic components. Their failure rate goes 
up the hotter they get. 

Heat sinks do indeed help keep all of this in balance. The heaters are designed to get the physics package to the
appropriate temperature from some very low point ( 0 or maybe -30C). They have *plenty* of reserve power 
capability. In addition, they run at relatively low power (relative to their ratings) in normal operation. Optimizing 
to reduce their failure rate while increasing the failure rate of a few hundred other parts does not improve the life
of the Rb …

Bob


> On Nov 23, 2020, at 7:33 AM, 李 <bd4kc at 126.com> wrote:
> 
> 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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> 
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> 	
> 李
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