Re: [CAD_CAM_EDM_DRO] Re: Re: Re: Power supply question.....

In a message dated 03-May-02 12:19:45 Central Daylight Time,
elson@... writes:

> There is a couple of volts of ripple on the capacitor,
> depending on how much droop occurs due to the load draining the
> capacitor between charging pulses from the transformer. If you put 34 V
> peak on a sizable capacitor, it will explode within seconds. At no load,
> there will be almost no AC on the capacitor. At full load, you would not
> want to see much more than 1 V droop (at 120 Hz) under normal conditions.
> If you use too small a capacitor, the droop will be larger, and the AC
> ripple
> current may cause the capacitor to run hot and fail early. Another reason
> to use a large capacitor is to ride through short power dips.

Jon: Maybe it's just Texas, but down here, we think DIFFERENTLY about these
details than you seem to. What school of electrical engineering says that
capacitors "run hot"? I was always taught that a capacitance neither "uses"
nor "supplies" energy! Ah, well . . . Perhaps things have changed since
I was a student.


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