PCBSpiralInductor.pas
2025-05-08 15:16:00
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his is an popular coil geometri used in todays wireless charger circuits.
The formula used in this calculation is based on the
Harold A. Wheeler approximations
for air core flat spiral coil inductor.
…where:
- L = inductance in μH
- Di = inner diameter in inches.
- s = distance between windings in inches
- w = wire diameter in inches
- N = number of turns
1 inch = 0,0254m=2,54cm = 25,4mm.
This formula applies at ‘low’ frequencies (<30MHz)
using enameled copper wire. Some people call it “magnet
wire”.
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