Improving Transformer Efficiency

Sources of power loss in a transformer include:

• Magnetic flux leakage
• Resistance in coils
• Eddy currents in the core

The following provides causes and fixes for these.

Magnetic Flux Leakage

Not all magnetic flux links both the primary and secondary coil, reducing efficiency.

• Use ferromagnetic core
  • Outer cores to channel the magnetic fields through the cores
• Reduce air gaps
• Reduce distance between coils

Resistance in Coils

• Cooling of wires (resistance increases with heat)
  • Heatsink to increase rate of heat dissipation
  • Black case to absorb heat
  • Internal fan

Eddy Currents in the Core

• Lamination of core
• Layers insulated by natural oxide layers on surfaces or by varnish coatings