Electric power conversion systems – Current conversion – Including an a.c.-d.c.-a.c. converter
Patent
1992-01-30
1994-03-08
Voeltz, Emanuel T.
Electric power conversion systems
Current conversion
Including an a.c.-d.c.-a.c. converter
336118, 336119, 336178, 324392, 324402, H02M 5458
Patent
active
052933083
ABSTRACT:
A contactless inductive power distribution system operating at 10 KHz has a self tuning resonant power supply connected to a resonant primary conductive path comprising a pair of parallel litz wire conductors each encapsulated within an insulated sheath and supported on a structural monorail beam on which a plurality of electric vehicles can run. Each vehicle has an electric motor capable of deriving power from a resonant pick-up coil wound on a ferrite core mounted on the vehicle in close proximity to the primary conductors. Each vehicle also has switching means capable of preventing a lightly loaded vehicle from presenting a reduced load to the resonant primary. In one version this comprises an isolating coil having a switch to switch the coil between an open circuit and a short circuit, so that when the switch is switched from one state to another state the power coupled between the primary conductive path and the pick-up coil is changed.
REFERENCES:
patent: 3532934 (1970-10-01), Ballman
patent: 4914539 (1990-04-01), Turner et al.
"Inductive Power Transfer to an Electric Vehicle"; Lashkari et al; Proceedings of Eighth International Electric Vehicle Symposium; Washington D.C., Oct. 1986.
"The Roadway Powered Electric Vehicle-An All-Electric Hybrid System"; Lechner et al., Proceedings of Eighth International Electric Vehicle Symposium; Washington D.C., Oct. 1986.
"Inductive Power Transfer to an Electric Vehicle-Analytical Model", 40th IEEE Vehicular Technology Conference, May 6, 1990, By M. Eghtesadi, pp. 100-104.
Boys John T.
Green Andrew W.
Auckland UniServices Limited
Voeltz Emanuel T.
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