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[SOLVED] Need help with transformer hookup

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Zak28

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Im a bit confused as how to hookup the primary to the wall in order to obtain the 385V from this transformers secondary. Im also unsure how much current the 385V will provide.

Doc: **broken link removed**
 

Like this if your mains is 240 VAC.
XFMR50Hz.png
 
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    Zak28

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Use BLK-WHT or BLU-BRN then.

I believe you are supposed to use the two 120V windings in parallel; if you use only one, your output power may be reduced.

This is a small transformer and the secondary winding resistance will limit the current in case of short circuit. But it may not be able to take a continuous short circuit.
 

your top diagram is correct, for 230Vac applied to the LHS, you will have 360 Vac on the sec at 119VA, this will peak rectify to 504V, need lots of C on the rectifier to keep the volts up for light loads ( < 0.5 amps )

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Oh yes, you can add in the 5Vac from the bottom winding to get 510VDc or thereabouts at light load...

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for short term operation ( 50% duty say ) you can overload the Tx up to 2x 240VA as long as you have good o/p bridge rectifiers, 1kV 25A say, and decent caps on the DC 385 - 450VDC in series with balancing / bleed resistors, and 1000uF or larger to reduce ripple and keep the average volts up ...
 

1000uF or larger to reduce ripple and keep the average volts up ...
Charging a cap with a full bridge circuit gives high peak current pulses, respectively high RMS currents in capacitors and diodes. Calculation is needed to see whether this capacitor is suitable or not for the rated XFMR.
 

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