Non-contact power feeding apparatus

Abstract

In a non-contact power feeding apparatus 7 of the present invention, power is fed through an air gap G from a power transmission coil 8 of a power feeding side circuit 4 to a power receiving coil 9 of a power receiving side circuit 5, which are closely located to face each other, based on a mutual induction effect of electromagnetic induction. The power transmission coil 8 and the power receiving coil 9 are respectively composed of a planar assembly of a number of unit coils 8' and 9'. Each unit coil 8' (9') is formed in a spirally wound flat structure, wherein the direction of an electric current I is set in reverse to make the north and south magnetic poles reverse between each unit coil 8' (9') which is juxtaposed to another to directly come into line. As a result, the unit coils 8' (9'), which are juxtaposed to another to directly come into line, are provided in such a manner that an overlapping area of a respectively formed magnetic field H cancels another out to be offset.

Description

technical field [0001] The present invention relates to a non-contact power supply device. The present invention relates to a non-contact power supply device that supplies electric power in a non-contact state from a power transmission side on the ground side to a power receiving side on the vehicle side, for example. Background technique [0002] A non-contact power supply device that supplies electric power to a vehicle such as an electric car from the outside without mechanical contact such as a cable has been developed and put into practical use as required. [0003] This non-contact power supply device is based on the mutual inductance of electromagnetic induction. From the power transmission coil of the power transmission side circuit fixed on the ground to the power reception coil of the power reception side circuit mounted on the mobile body such as a vehicle, there is a distance of, for example, tens of millimeters or more to several tens of millimeters. Power is s...

AI Technical Summary

Problems solved by technology

[0016] However, if the air gap G is enlarged, the exciting reactive power of the power transmission coil 2 increases proportionally, and thus it is necessary to increase the exciting apparent power.

As a result, the electromagnetic field radiation D to the outside is expanded and the electromagnetic field intensity r is increased, which increases the risk of damage caused by electromagnetic waves to the neighbors mentioned above.

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