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#148642 - 08/31/01 09:43 AM Full Wave Rectifier - 3 Phase Input
Scott35 Offline

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Registered: 10/19/00
Posts: 2707
Loc: Anaheim, CA. USA

Simple Full Wave Rectifier circuitry, using a 3 phase 3 wire Delta input.
Compare this schematic and wave plots to the 1 phase full wave bridge schematic and wave plots [separate topic]. This Rectifier has a raw pulsating output which is much smoother [stable] even before going through the filter.

Reference of AC output from transformer's secondary, to Rectifier's input. Plotted points are [AC] on the schematic.

Resulting pulsations [Pulsating DC] from Rectifier's output, and at filter's input. Plotted at [+DC] and [-DC] points.

Smoothed DC output from filter. Plotted at [+DC OUT] and [-DC OUT] points.

Compared to the 1 phase bridge circuit, this one has a much more stable DC output.

FYI: Trade this 3 phase 3 wire Delta transformer for one of the 6 or 9 phase ones I posted before [the "Rectifier Transformers"], and add another set [or two] of Diode Trios, then figure the pre filter DC output. The ripple will be lowered even more than the 3 phase one shown here.

What's all this mean, or is good for??? Who the heck knows
Seriously, it is a premium DC supply for things like Inverters, UPS's, Electronic stuff [like power amps, etc.]. The most common and ordinary example of a 3 phase input rectifier would be Automotive Alternators.
They are primarily Wye wound Stators, but some heavy duty applications use a Delta wound Stator.
The rotating field [2 pole mostly] is controlled via the regulator circuitry. This regulation controlls the peak voltage output and stuff like that [technically speaking].

Discussion thread and links to follow sometime this weekend [hopefully].

You may contact me directly if there's any questions that can't wait .

Scott SET 08/31/2001
Scott " 35 " Thompson
Just Say NO To Green Eggs And Ham!
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