[Elecraft] Battery Charging with DC Power Supply

[Ron D'Eau Claire]

Tnx Wes! 

 

So the battery voltage across  the power supply terminals keeps the SCR
turned on, even though the supply voltage is turned off by the crowbar.

 

That would surely lead to a dead SCR without a suitable fuse in the battery
circuit. 

 

Ron AC7AC 

 

 

 


Since Astron has been mentioned in this thread, I'll use that as an example.

The SCR that is part of the crowbar is connected directly across the output
terminals of the supply.  When used normally, the firing of the SCR shorts
the output and the supply goes into current limit, if still functional, or
hopefully blows the primary fuse if not.

With a battery across the output, if the SCR fires, something is going to
fuse.  It will be either a user-installed external fuse or something else.
It would probably not be a good idea to rely on the something else.

Wes  N7WS