Primary inductive pathway

Details Primary inductive pathway Primary inductive pathway

1994-11-10

1997-04-08

Shoop, Jr., William M.

Electrical transmission or interconnection systems

Plural supply circuits or sources

Connecting or disconnecting

191 10, 191 6, 191 12R, 104287, 104288, 104292, 104298, H02J 306

Patent

active

056190786

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

1. Field of the Invention
This invention relates to power distribution systems, particularly those using inductive power transfer from high frequency resonant currents within the primary conductors, and more particularly to modular resonant magnetic field emitter units.
2. Description of the Related Art
Long-standing problems exist in the conventional transfer of electric power to self-powered moving vehicles. Those having a sliding brush rubbing along a fixed current-carrying conductive rail exhibit wear, dust production, intermittent loss of electrical contact, sparking, and electric shock hazards. Vehicles lacking the guidance of weight-bearing rails are particularly prone to wander away from a defined route and are then likely to lose electrical contact with a supply conductor.
Inductive power distribution systems overcome many of the problems by using the alternating magnetic field surrounding a fixed primary conductor to induce current in a secondary conductor at some distance from the primary conductor, thereby avoiding direct contact. They are particularly suited to providing motive power.
The use of high-frequency resonating currents within primary and secondary conductors has greatly improved the efficiency of inductive power distribution, and recent developments in semiconductor technology have permitted the application of improved inductive power systems as have been described by Boys & Green in WO 92/17929.
Resonant inductive power transfer systems been hampered by the difficulty of driving long tracks with sufficient power. Although a track of a given length can be supplied with more power simply by using higher voltages, reasonable safety requirements may be exceeded, and the ratings of presently available electronic components used in the power supply will generally be exceeded with output voltages above 600 V.
A further drawback of such systems is the risks to health understood to be caused by strong magnetic fields radiated by current-carrying conductors; risks that have resulted in stringent field strength guidelines being adopted. Delivery of realistic amounts of energy for motive power purposes is usually likely to breach these restrictions.


OBJECT OF THE PRESENT INVENTION

It is an object of the present invention to go some way towards providing an improved and safer inductive power transportation system, or at least to provide the public with a useful choice.


SUMMARY OF THE INVENTION

In one aspect the invention provides a primary inductive pathway for a resonant inductive power distribution system capable of operating at a system resonant frequency, said pathway adapted to be connected to a power supply and having two spaced apart conductors terminated by a bridging element and forming with said power supply a closed loop, conductor modules, each primary conductor module having a resonant frequency compatible with the system resonant frequency, each said primary conductor module comprising a first conductor and a second conductor spaced apart from one another, each conductor having a first connector and a second connector, each module having at least one capacitor; adjacent modules or to a bridging element at one end of the pathway, pathway, through the length of which an effective amount of inductive power can during use be propagated.
In another aspect the invention provides a primary inductive pathway for a resonant inductive power distribution system capable of operating at a system resonant frequency, said pathway adapted to be connected to a power supply and having a first conductor and a second conductor spaced apart from one another together, and the pathway includes a capacitor, and a linkage; end capable of being connected to a power supply, the capacitor being connected across the second ends of the first and second conductor, conductor and the second end of the second conductor, and a connection between the first end of the second conductor and the second end of the first conductor, along the length of the pathway.
Other aspects of the in

REFERENCES:
patent: 3792665 (1974-02-01), Nelson
patent: 5207304 (1993-05-01), Lechner et al.
patent: 5293308 (1994-03-01), Boys et al.

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