Guru
Joined: 21/06/2018
Location: AustraliaPosts: 1251
| Posted: 01:32am 27 Oct 2023 |
Hmm those figures of idling current seemed a bit high so I went and remeasured with a Variac and an accurate watt meter. Sure enough they were very wrong.
The figures I posted above were logged about a week before posting and were for the total DC Power idling Watts for various output voltages using an EG8010 controller drive, no wonder they were a tad high!
I relogged both windings separately against various 5V increments from 200V to 250V and made a table of the results for the Aerosharp 3.5KW Toroid.
So reposting the last paragraph from the previous post of the idling watts with the CORRECT values:
Stacking 3 such cores and using an 8T primary is also possible but would be hard to physically manage, the idling power for the 2 cores would be ~ 27W, 3 would be ~ 40.5W
If instead of removing 17T from the 250V winding you added 17T to each 230V winding and paralleled up all the 250V windings but ran the output voltage at 230V from the 250V windings for a 3 stack, driven from a 9T primary, idling is a bit better at ~ 10.8W for each toroid or 32.4W for the 3 toroids. Note this is AC power required for just idling an inverter with no load and does not take into account inverter and solenoid etc running currents.
Edited 2023-10-27 11:33 by wiseguy