| 摘要 |
A switched mode power supply includes a dc-to-dc converter with a transformer T1 operable at the converter switching frequency. The transformer includes a primary winding and a secondary winding, a pair of capacitors C1, C2 connected in series between the secondary transformer circuit and the primary transformer circuit, and an inductor connected between the junction of the two capacitors and chassis earth. The capacitance of the capacitors and the inductance of the inductor are selected so that the capacitors in series present a low impedance to noise signals and the inductor presents a high impedance to noise frequencies.
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