This is a Parametrics FHP motor drive – a three phase inverter. This is called a six-step inverter. Parametrics was a small company in Orange Connecticut. I began my power electronics education there in 1978 and was fortunate to have been able to work with some outstanding engineers while I was there.
The Parajst GX was an inverter I worked on while at ABB. The Parajust was a pulse width modulated three phase inverter. It used high frequency transformer coupled gate drives, and a flyback power supply that ran off the DC bus. The GX introduced a software defined overload protection scheme which UL signed off on. The base was an investment casting and the cover was injection molded. This was a very popular motor drive at the time.
The MK 48 torpedo has been around for a long long time. Many of the MK48 torpedos are fired during practice shots and then retrieved. I was a diver and retrieved many out of Pearl Harbor. More recently I have been involved with a new power supply for the MK48. The new power supply uses a dozen LiFePO4 cells to produce 300VDC at a kilowatt. This power supply must run for 12 seconds to start the torpedo.
This is a Lithium battery pack for the Gulfstream Personal Jet. I worked on the design while I was contract at Secruraplane in Tucson, AZ. The pack uses 224 lithium ion cells, wired to produce 24vdc. The stack is 8 high with 8 individual chargers for each row. This pack is used to start the aircraft. I enjoyed the winter I spent in Arizona, and was happy to have been able to help Securaplane. I made a 32 point presentation to management which highlighted problems and included suggestions towards improving designs