Hello Curt,
Over-Voltage Protection is normally done with a "crowbar" circuit.
There are several circuits but the gist is you have a comparator with a
very sharp knee that triggers an SCR. The SCR conducts the shorting
current and blows the fuse. I've seen circuits using a UJT and another
using a 723 voltage regulator. Mine uses a 723 voltage regulator. If I
can find the schematic, I'll scan it and send it to you.
73, Tim, W2UI
Hulett, Russell wrote:
Hello Mike,
As I read the datasheet for the 1.5KE15A, the breakdown voltage is nominally 15
VDC. So when the pass transistor shorts, won't the transient diode limit the
voltage to the load to nominal 15 VDC, bypassing enough current to ground to
trip the overload on the power supply?
I intend to incorporate a fast-blow fuse, not sure why the question prompted
the sarcasm.
73, Curt KB5JO
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