Technical Paper
High Power Density Converters for More Electric Aircraft Applications1
1999-08-02
1999-01-2546
A dc-dc converter and a dc-ac inverter have been developed for More Electric Aircraft (MEA) use. They are both highly compact and are designed to operate from 270 Vdc input power and produce output power that meets requirements for fighter aircraft, including compliance with MIL-STD-704E and MIL-STD-461D guidelines. Both units are designed to be cooled with Poly Alpha Olefin (PAO) at 30°C maximum inlet temperature and to operate for 30s after a loss of coolant flow before shutting down. Both units incorporate under/over voltage, short circuit, and over temperature protection. The dc-ac inverter also has over/under frequency, dc content, waveform distortion, and zero voltage content protection. The dc-dc converter provides 5.6 kW at 29±0.5 Vdc with an efficiency of 85%. It weighs 9.1 lb and is 6″ long by 5″ wide by 5.5″ high (165 in3). The dc-ac inverter provides 8 kVA of three phase power at (115±1.5)/200 Vac and 400 Hz with an efficiency of 75%.
