The core loss depends on the working frequency, the working magnetic induction intensity, the working state of the circuit and the performance of the selected core material. For bipolar switching transformer, core loss Pc:
Where: Pb is the core loss per unit mass (w/kg) at working frequency and working magnetic induction intensity; Gc is the core mass (Kg).
For unipolar switching transformer, the loss of magnetic core is about half of that of bipolar switching transformer because the magnetic core works in the half area of hysteresis loop. Total transformer loss is the sum of total copper loss and core loss.
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