[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

primary side charging inductors

Original poster: Jim Lux <jimlux@xxxxxxxxxxxxx>

The recent discussion about CAUAC's primary side inductors brings up an interesting point. If you have 3 phase power, this works very nicely. The idea of putting the choke on the primary is very attractive because
a) it's at a reasonable voltage
b) you have the transformer working for you, so you don't need as much inductance

Rather than trying to make huge inductors (albeit at low currents) that can hold off tens of kV, you can make (or buy) a high current, low voltage inductor.

But, what if you have single phase power, still want to do DC resonant charging. (not rectified AC, but real DC).

Obviously, this doesn't work if you have a big honking (term of art) filter capacitor.

It might be that overall, the total system might be smaller and lighter weight if you used a rotary converter (or, maybe, some combination of L and C on the primary side, like big arc welders do) to synthesize 3 phases.

Ultimately, I suppose that the energy stored in the inductor is the same, so it will be about the same size, regardless of position.

In fact, perhaps the rotary converter could serve as the inductor (if it were a wound rotor var compensator/synchronous condenser, it almost certainly could).

We're talking here about systems that are >10kVA (for smaller, it's probably not worth it), but that are still running off single phase.