Mitigation of EMI/RFI produced by a 1.2 kW uninterruptible power supply

Abstract

Recently installed equipment in naval receiving sites, such as Uninterruptible Power Supplies (UPS), digital telephone switching systems, and personal computers, inject noise into receiver systems via power conductors, cable shields, and grounds, thus reducing the probability of intercept of a signal of interest, in the 2-100 NMHz range. In this thesis a survey of EMI/RFI sources at receiving sites is performed. The effectiveness of a Barrier-Filter- Ground architecture in containing/eliminating EMI/RFI from a 1.2 kW UPS is tested. The spectral and temporal properties of the EMI/RFI from the UPS are recorded. estimates for the EMI/RFI power are obtained from 60Hz to l00kHz, and a possible solution is proposed for obtaining noise power estimates for higher frequencies.