Low output noise switched mode power supply with shieldless transformers
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United States of America Patent
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Jan 25, 2005
Grant Date -
Nov 11, 2004
app pub date -
Jun 17, 2004
filing date -
Apr 12, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A switched mode power supply which uses a shieldless transformer (11) in the dc to dc converter. Common mode switching noise is reduced by connecting two capacitors (17, 18) in series between the transformer primary (12) and secondary (13) circuits and connecting an inductor (19) between the junction of the two capacitors (17, 18) and chassis earth. The values of the capacitors (17, 18) and inductor (19) are selected such that the capacitors (17, 18) present a low impedance to noise signals and the inductor (19) presents a high impedance to noise signals.
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