Dc link inverter for army power conditioner requirements

This paper describes the 12.5 kVA dc link inverter being developed by Delco Electronics - Santa Barbara Operations for USA MERDC, Ft. Belvoir, Virginia. The inverter can produce 120/ 208 volts three-phase, 120 volts single-phase, or 120/240 volts single-phase power at 60 or 400 Hz. It has an efficiency of 84 to 94% and a breadboard weight of 150 pounds. Based on a patented design concept (No. 3,725,767), the inverter generates stepped wave and square wave voltage segments which are combined as a three-phase composite to produce line-to-line waveforms of 4% total harmonic content before filtering. Study results show that the basic inverter concept can take several circuit forms, and can be developed with ratings up to 100 kVA. The inverter is being developed as a candidate for the Army 15 kVA general purpose power conditioner, and as such must conform to MIL-STD-1332B and MIL-STD-461A.