Electromagnetic Emissions from a Modular Low Voltage Electro-Impulse De-Icing System
Abstract
An important consideration in the certification of Electro-Impulse De-icing (EDI) systems for aircraft ice protection is electromagnetic interference (EMI). When the capacitor bank in an EIDI system discharges a large pulse of current travels down a transmission line to the coil. Subsequent radiation by the transmission line and the coil produces EMI. The Low Voltage Electro-Impulse De-icing system (LVEIDI) is unique in that the capacitor bank is mounted adjacent to the coil thereby eliminating most of the cables. Electromagnetic emissions form this system would then be primarily from the coil. The performed tests investigate the EMI environment inside and outside of both a composite and an aluminum wing. Due to the absence of the shielding effect of aluminum the problem of electromagnetic emissions is particularly severe when the wing is constructed of composite materials. Measurements of the radiated electric field indicate that emissions from the aluminum wing were well within the standards. Some tests with the composite wing were within standards while others were not. It was found that the composite wing could be brought back into compliance through the addition of thin metallic shielding. Conducted emissions on the LVEIDI power feed cable were brought within standards with the addition of a line filter. An unshielded connection cable for a compass flux valve was run through the wing just behind the LVEDI module. Discharge of the capacitor bank had no discernible effect on operation of the compass flux valve. No problems were observed in other tests of the wing internal environment.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 1989
- Accession Number
- ADA208191
Entities
People
- Brent Huffer
- James Ng
- Pater Zieve