Power supply filtering

Details Power supply filtering Power supply filtering

2006-07-25

2006-07-25

Vu, Bao Q. (Department: 2838)

Electric power conversion systems

Current conversion

With means to introduce or eliminate frequency components

C363S049000, C363S055000

Reexamination Certificate

active

07082041

ABSTRACT:
A power supply is filtered while the amount of in-rush current required by the capacitive charging of the filter is limited. A resistor may be placed in parallel with a relay where the parallel combination is in series with the filtering capacitor. The relay is open upon applying power to the filter and remains open while the capacitor at least partially charges to cause charging current to pass through the resistor and thereby limit in-rush current. The relay is closed thereafter to provide a short circuit around the resistor and thereby unrestrict filtering by the capacitor. Alternatively, a common mode choke is disposed between a capacitor across input nodes and a capacitor across output nodes, whereby the size of the capacitors may be reduced to limit the in-rush current due to the common mode choke. The power supply filter may be included as part of a power distribution panel.

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