| 摘要 |
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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