Ask : Does the power of the ring high frequency transformer depend on the size of the iron core or the diameter of the wire?
The size of the core, in other parameters (such as a certain switching frequency), the greater the power, the larger the transformer core.
Line diameter is related to the size of the current. When designing high-frequency transformers, the general current density is 3~5A/ mm square. Obviously, the larger the current is, the thicker the line is required.
But the magnitude of the current is not necessarily related to the power.
Please see the ETD Transformer design , ER Transformer design, POT Transformer , EC Transformer