[Elecraft] Re: Anyone know this info about switching supplies?

[wayne burdick]

Tom Hammond wrote:

> WB:
>
> We're discussing it here right now... what would the 'damages' be if a 
> supply (ANY supply) could/would fail placing 24VDC at up to 30A on the 
> K3's DC line?
>
> I'm thinking about designing an external plug-in OVP kit.  Unless YOU 
> want to do it.
>

The K3 already has OVP built-in, in the form of high-current, 
high-power zener clamp that kicks in at around 16 V. It can handle 
hundreds of amps for long enough to blow the self-resetting polyfuse 
(F2 on the RF board schematic). An identical device is used on the 
KPA3, which has its own circuit breaker. So the OVP is very rugged and 
reliable.

In addition, as a backup, the K3 will turn itself off if it senses an 
over-voltage condition.

73,
Wayne
N6KR


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