LECTURE 34 HIGH FREQUENCY TRANSFORMER

1 LECTURE 34 HIGH FREQUENCY of Cu wire Windings and Core WireWinding wire Skin Effect and Multi-wireProximity Effects Alter Both Primary andSecondary R( wire coil) via Effective Acu ( wire ) Inductance s: Lm and Lla. Magnetizing Inductance, Lm: Core Fluxb. Leakage inductance, Ll: Air Window FluxA crude estimate for Ll is (1*Lm)/ andInterleaved Primary/Secondary Windingeffects Core Loss: Rma. Hysteresis Loss due to frictional movementb. Eddy Current Loss due to core is the TRANSFORMER Magnetization Current,im ,Created?a. im is Not effected by load current at allb. im = vLdt/Lm volt-second driven (max) of the core of a LossyTransformera.

use the largest wire that will fit into the window. This minimizes losses, and maximizes the power rating for a transformer. High frequency windings are more complex to deal with for reasons as described below. b. Single Wire Skin Effect multi-wire and proximity effects. The tendency for hf currents in wire coils to go to the wire surface, alters

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