A single 3.7v LiPo cell has an ESR less than 0.1Ω . to provide 20A at 565V choose the A-h capacity you need to determine the number of parallel , series strings at desired current. It might end up looking like a Tesla battery pack or maybe just an array of 157S4P or about 628 X 16850 cells.
This will not be any cheaper to emulate.
You would need at least a 10kVA transformer, or more i.e. give 30% margin.
Then add 10kVA active PFC , 3 phase 100A diodes to give an ESR < 0.01 Ω then low ESR Caps such that ESR*C = 2/f to 5/f to regulate ripple.
total cost is likely to exceed your budget.
Assuming you are talking about 400v phase to phase, and 230v phase to neutral supply.
A straight six diode bridge will charge to twice the peak of 230v rms, or in theory about 650 volts dc. You can reduce that by any amount by using three bucking auto transformers.
A much nicer way would be to try and source a second hand three phase variac.
Connect that to a six diode bridge and some serious capacitance.
Then you have a monster 0 to 650v dc power source where you can tweak the output voltage under load to the exact voltage required.
Handy for testing under and over voltage functionality of the inverter too.
These variacs are normally rated for continuous operation in still air. If you submerge one into a tank of oil, the power rating can be safely just about doubled.
Also, because you can wind it up from zero manually, current inrush into your capacitors will not be an issue. Very simple an robust and should come in well under your budget.
I have a three phase 15A variac that I sometimes hook up as a high voltage dc supply, and it works very well,
A straight six diode bridge will charge to twice the peak of 230v rms, or in theory about 650 volts dc. You can reduce that by any amount by using three bucking auto transformers.
This is true when you have two capacitors at the output:A straight six diode bridge will charge to twice the peak of 230v rms, or in theory about 650 volts dc. You can reduce that by any amount by using three bucking auto transformers.
Do you know any industrial three-phase inverter that connects the star point?This is true when you have two capacitors at the output:
* one from bridge + output to star point
* the other from bridge - to star point
Then the voltage across both capacitors is about 650V
Yes have to agree.No doubt that a +/- 325 V supply with N-connected midpoint has some applications. I was just talking about 3-phase inverters state-of-the-art. And as Barry675 is asking for 565V rather than 650V DC, the usual solution seems to fit here as well.
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