Transcription of EMI Filter Design - Reverse engineering
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EMI Filter Design - Reverse engineering
P1: IML/OVYP2: IML/OVYQC: IML/OVYT1: IMLMHBD017-03 Sandler 6, 200518:53 Chapter3 EMI Filter DesignNearly all power circuits contain an input electromagnetic interference(EMI) Filter . The main purpose of the EMI Filter is to limit the inter-ference that is conducted or radiated from the power circuit. Excessiveconducted or radiated interference can cause erratic behavior in othersystems that are in close proximity of, or that share an input sourcewith, the power circuit. If this interference affects the power circuit, itcan cause erratic operation, excessive ripple, or degraded regulation,which can lead to system level problems. Input EMI filters may alsobe used to limit inrush current, reduce conducted susceptibility, andsuppress spikes. The specifications for the allowable interference aregenerally driven by the power circuit specification. The most commonspecifications include MIL-STD-461 for military applications and FCCfor commercial applications. Many other EMI specifications also chapter will deal with the Design and analysis of EMI filtersthat will reduce conducted interference and conducted susceptibilityand limit inrush current.
P1: IML/OVY P2: IML/OVY QC: IML/OVY T1: IML MHBD017-03 Sandler MHBD017-Sandler-v4.cls October 6, 2005 18:53 EMI Filter Design 65 The input resistance is negative because as the input voltage in-
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