Method and apparatus for reducing audible acoustical noise in a power supply transformer by shaping the waveform of a primary side inductor current

摘要

An apparatus for reducing audible noise in a power supply (16) is provided. The apparatus comprises a shaper circuit (258) located on the secondary side (204) of a transformer (200) that is operable to control the shape of the current through a primary side inductor (222). By changing the shape of the current, acoustical noise is reduced in the transformer (200).