Contactless power distribution system

Electric power conversion systems – Current conversion – Including an a.c.-d.c.-a.c. converter

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307 101, 191 10, H02M 545

Patent

active

058318410

ABSTRACT:
A primary inductive path to which a high-frequency current is supplied from a power supply is laid along a guide rail for carrying car bodies and secondary electric power receiving circuit for receiving electric power from the primary inductive path in a contactless mode are disposed in the car bodies. Inductance in the primary inductive path is adjusted by disposing, in the power supply, a dummy inductor which is composed by overlapping a plurality of planar ferrite cores with gaps reserved so as to form a plurality of ferrite blocks and combining these ferrite blocks so as to form at centers thereof a run-through slot for passing the primary inductive path. Further, the secondary electric power receiving circuit is composed of a pick-up coil in which an electromotive force is generate by a magnetic flux produced by the primary inductive path, a capacitor which composes, together with the pick-up coil, a resonant circuit resonating with a frequency in the primary inductive path, a rectifier circuit connected to the capacitor, and a constant-voltage control circuit which is connected to the rectifier circuit and controls an output voltage to a standard voltage, and uses standard voltage generators which set the standard voltage of the constant-voltage control circuit at two steps in proportion to a load electric power as well as a controller for switching the standard voltage generators.

REFERENCES:
patent: 5293308 (1994-03-01), Boys et al.
patent: 5528113 (1996-06-01), Boys et al.
patent: 5669470 (1997-09-01), Ross

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