Guide
1
calculation primitive W-shaped transformer best illustrated with an example.Suppose you need to calculate the transformer parameters: supply voltage U1 = 220;output voltage (secondary voltage) U2 = 12V;load current i2 = 0.5A.First, determine the output: P2 = U2 * i2 = 12 * 0.5 = 6W.For such a power can take the magnetic section of about four square centimeters (S = 4)
2
Next, calculate how much is needed for one volt coils.For the W-shaped transformer is the formula: K =
50 / S = 50/4 = 12.5 turns per volt.
3
Then, calculate the number of turns of the primary winding: W1 = U1 * K = 220 * 12.5 = 2750 turns.And the number of secondary turns: W2 = U2 * K = 12 * 12.5 = 150 turns.
4
After that, define the primary current: i1 = (1,1 * P2) / U1 = (1,1 * 6) / 220 = 30mA.And then be able to calculate the diameter of the wire of the primary winding insulation.The fact that the maximum current for copper wire is 5 amperes per square millimeter, so: d1 = 5A / (1 / i1) = 5A / (1 / 0,03A) = 0.15 mm.
5
Finally, calculate the diameter of the wire of the secondary winding of the formula, d2 = 0,025 * square root of i2, i2 value substitute in this formula milliamp: d2 = 0,025 * 22,4 = 0,56mm.