Guru
Joined: 09/08/2007
Location: AustraliaPosts: 4406
| Posted: 05:00am 13 Jan 2022 |
That is a rather interesting idea.
Multiple inverters could be running connected in parallel at 50Hz, but as far as the individual mosfet switching on/ff times at the pwm switching frequency, they would be quite independent.
So one inverter could have slow lazy mosfets, the other slightly faster mosfets and it would hardly make any difference.
Certainly a lot more forgiving than directly hard wiring multiple mosfets in direct parallel in one inverter.
In fact this principle is used a lot in radio transmitters using transistors. Multiple power modules where the outputs are combined. And for similar reasons.
Magnetizing current at a particular flux density is measured as "watts per Lb".
So five 10Kg transformer cores end up with the same core loss as one 50Kg transformer core. No difference there in no load losses.