Method and apparatus for reducing audible acoustical noise in a power supply transformer by shaping the waveform of a primary side inductor current
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United States of America Patent
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Nov 5, 2002
Grant Date -
Jun 27, 2002
app pub date -
Apr 2, 2001
filing date -
Dec 21, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
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).
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