Where to buy the inductors for LC filter in low voltage high power converter designs?
Due to the current and special requirements, these inductors would most likely be custom wound to your specifications.
I'd suggest you contact a local transformer or specialist inductor company in your region.
Just so you get an idea of what size etc might be involved, there are online calculators for inductors. It is an iterative process as the first tradeoff is determining the conductor size and number of turns required. This calculation needs the core specifications, so you iterate until you get a core that can physically support the required number of turns. For 7200Hz, a core material of good quality laminated iron would probably suffice. This would most likely be an E &amp; I core as you'd find on many transformers.