Re: [CAD_CAM_EDM_DRO] Re: cap question

In a message dated 01-Apr-02 21:55:50 Central Standard Time,
pbweber@... writes:

> I'm thinking a zener diode to ground rated a little
> above the rated voltage of the cap?

Paul: This first must assume the zener you'd USE for that has a sufficient
WATTAGE to accept the over-voltage, and the current through it that would
result therefrom. This can cause WORSE "explosions", not to mention damage
to the power-supply bridge-rectifier, or VR, if used.

One way to "protect" the zener is to insert a low-R (0.1 ohm, etc.) of how
many, fifty watts?, in series with the zener. And, use a 50 W zener. Ever
price those???

This is simply one of those "good ideas on paper which are not practical".
Best engineering is to design with a CAP rated for the "worst case" voltage!
It doesn't have to be "close", just "over"! MUCH cheaper alternative to
"engineering a fix for an imagined, not-yet-experienced problem!!!!! Jan
Rowland


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