Low output noise switched mode power supply with shieldless...

Details Low output noise switched mode power supply with shieldless... Low output noise switched mode power supply with shieldless...

2005-01-25

2005-01-25

Sterrett, Jeffrey (Department: 2838)

Electric power conversion systems

Current conversion

With means to introduce or eliminate frequency components

C363S047000

Reexamination Certificate

active

06847530

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.

REFERENCES:
patent: 3731234 (1973-05-01), Collins
patent: 4326179 (1982-04-01), Lasar
patent: 4686614 (1987-08-01), Costello
patent: 4888675 (1989-12-01), Kumar et al.
patent: 5335161 (1994-08-01), Pellegrino et al.
patent: 6137392 (2000-10-01), Herbert
patent: 6765811 (2004-07-01), Chang
patent: 2000333463 (2000-11-01), None

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