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Sources: ElectroBOOM and wikipedia. None of this is actually my work, I just copied what the circuit from what it said on wikipedia.
What happens here is a high voltage 3 phase power line comes in to be converted to DC (this is the three AC sources) which powers a regular 3-phase full bridge rectifier and also a 30 degree phase shift transformer (the input of the transformer is in delta configuration while the output is in star/wye configuration which produces a 30 degree phase shift and also multiplies the voltage by the square root of three, so the transformers have a similar ratio (989/571) to counter that. That 30 degree phase shifted three phase power goes to a second three phase full bridge rectifier which is placed in series with the first full bridge rectifier. This way, since the full bridge rectifier produces a “bumpy” output and the peaks in the waveform of one rectifier match the dips on the waveforms of the other rectifier it produces a stabler output voltage with less variation. However, there is still some 720Hz and harmonics to be filtered out, so that would be dealt with by a large capacitor, but EC doesn’t like it when I put in that capacitor or any capacitor really, even a 1pF one. Also, the 1GΩ load is such a high resistance because anything lower will distort the waveform because EC transformers aren’t good with high power. Also, the diodes here should actually be thyristors with a separate AC signal to turn them on and off at the correct times, but not only does EC not have thyristors but it would be too complex as EC already doesn’t really like the circuit how it is.
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