Wave transmission lines and networks – Coupling networks – Frequency domain filters utilizing only lumped parameters
Patent
1990-01-03
1992-01-21
LaRoche, Eugene R.
Wave transmission lines and networks
Coupling networks
Frequency domain filters utilizing only lumped parameters
333 12, 333185, 336212, 336229, 361328, H03H 700, H01F 2724
Patent
active
050831011
ABSTRACT:
An integrated electromagnetic interference filter includes an inductor assembly for attenuating both common mode and differential mode electromagnetic interference conducted emissions from electronic equipment. The inductor assembly includes an outer core of permeable material defining an outer window, and an inner core of permeable material disposed in the outer window and defining an inner window. A first power lead for connecting the equipment to a source of electrical power includes a portion wound in one direction about only the outer core. The inductor assembly includes a second power lead for connecting the equipment to the source of electrical power with a portion of the second lead wound about both the inner and outer cores in the opposite direction to the winding of the portion of the first power lead. The outer core provides a magnetic path for the attenuation of common mode emissions and the inner core provides a magnetic path for the attenuation of differential mode noise. The filter can also include a multiple function capacitor including three capacitive elements.
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Technical Notes, "Understanding RFI Power Line Filters", Corcom.
"Switching Power Supplies, Radio Frequency Interference, & Power Line Interference Filters", by Werner Neuman, Corcom, Inc.
Ham Seung
Integrated Power Components
LaRoche Eugene R.
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