Re: [CAD_CAM_EDM_DRO] Sizing Rectifiers

Ah, that explains it. I had wondered about that, as the only three phase I've
seen torn down years ago, had all six transformer wires seperated out, i.e., 6
wires, no Y config.

Thanks.

Bill

On Sun Dec 2 15:48:34 2001, JanRwl@..., <JanRwl@...> wrote:

>In a message dated 30-Nov-01 23:33:38 Central Standard Time,
>ccq@... writes:
>
>
>> I've Never heard of a full wave _6_ diode bridge. I've seen plenty of 4
>> diode
>> bridges circuits, but never a 6. What do you do with the extras?
>>
>>
>
>Bill: Read again, THREE phases! That's three separate
>transformer-secondaries (six wires), connected in a "delta" configuration
>(three "terminals"). You connect TWO diodes to each "terminal", each facing
>opposite directions, and the other ends of those, then, to the pos. and neg.
>outputs. Repeat for all-three terminals. Two times three is SIX. Did I do
>the math right? (I flunked Differential Equations!). This is "Full-Wave,
>Three Phase". It gives you a ripple-frequency six times higher than
>half-wave, single-phase, so, each "bump" is very short and of low
>potential-difference. Thus, the "filtering" is very easy, and the "raw DC
>out" is nearly equal to PEAK-AC voltage (1.414 x RMS, isn't it?).
>
>A three-phase rectifier, all else being equal, is more expensive than a
>"good, full-wave single-phase", but it gives a nicer, easier-to-regulate
>DC-out, it does! (Not worth that extra in many cases, but good when
>high-currents are needed, with decent regulation).
>
>Hope to have been usefully helpful! Jan Rowland, Troll

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