Wireless power feeder, wireless power receiver, and wireless power transmission system

a wireless power and receiver technology, applied in the direction of charging stations, electric vehicle charging technology, transportation and packaging, etc., can solve the problem of small electric power, and achieve the effect of easy increase the efficiency of wireless power feeding

Inactive Publication Date: 2012-12-27
TDK CORPARATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention relates to a wireless power transmission system that includes a wireless power feeder and a wireless power receiver. The wireless power feeder has multiple feeding coils and a power transmission control circuit for supplying AC power to the receiving coil. The receiving coil has a loading coil that is magnetically coupled to it and receives the AC power from the feeding coil. The system also includes a secondary battery connected to the loading coil. The feeding coils are arranged adjacent to each other, and their surfaces partially overlap. The technical effect of this invention is to increase the efficiency of wireless power feeding to a moving object.

Problems solved by technology

The type (B) utilizing radio wave is available in a long range; however, it has small electric power.

Method used

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  • Wireless power feeder, wireless power receiver, and wireless power transmission system
  • Wireless power feeder, wireless power receiver, and wireless power transmission system
  • Wireless power feeder, wireless power receiver, and wireless power transmission system

Examples

Experimental program
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Effect test

first embodiment

[0042]FIG. 1 is a view illustrating operation principle of a wireless power transmission system 100 in a first embodiment. A wireless power transmission system 100 according to the first embodiment includes a wireless power feeder 116 and a wireless power receiver 118. The wireless power feeder 116 includes a power supply circuit 110 and a feeding coil circuit 120. A power feeding LC resonance circuit 300 is formed by the feeding coil circuit 120. The wireless power receiver 118 includes a receiving coil circuit 130 and a loading circuit 140. A power receiving LC resonance circuit 302 is formed by the receiving coil circuit 130.

[0043]The power supply circuit 110 includes a power feeding source VG (power transmission control circuit) and an exciting coil L1. The feeding coil circuit 120 (power feeding LC resonance circuit 300) includes a capacitor C2 and a feeding coil L2. The receiving coil circuit 130 (power receiving LC resonance circuit 302) includes a capacitor C3 and a receivin...

second embodiment

[0059]FIG. 10 is a view illustrating operation principle of a wireless power transmission system 100 according to a second embodiment. The wireless power transmission system 100 according to the second embodiment includes a wireless power feeder 116 and a wireless power receiver 118. The wireless power feeder 116 includes a power feeding LC resonance circuit 300. The wireless power receiver 118 includes a receiving coil circuit 130 and a loading circuit 140. A power receiving LC resonance circuit 302 is formed by the receiving coil circuit 130.

[0060]In the second embodiment, the wireless power feeder 116 has the same configuration as that of the wireless power feeder 116 of the first embodiment except that it does not have the exciting coil L1. When the power feeding source VG supplies AC power to the power feeding LC resonance circuit 300 at a resonance frequency fr1, the power feeding LC resonance circuit 300 resonates at a resonance point 1 (resonance frequency fr1).

third embodiment

[0061]FIG. 11 is a view illustrating operation principle of the wireless power transmission system 100 according to a third embodiment. The wireless power transmission system 100 of the third embodiment also includes the wireless power feeder 116 and wireless power receiver 118. However, the wireless power receiver 118 includes the power receiving LC resonance circuit 302, while the wireless power feeder 116 does not include the power feeding LC resonance circuit 300. That is, the feeding coil L2 does not constitute a part of the LC resonance circuit. More specifically, the feeding coil L2 does not form any resonance circuit with other circuit elements included in the wireless power feeder 116. No capacitor is connected in series or in parallel to the feeding coil L2. Thus, the feeding coil L2 does not resonate in a frequency at which power transmission is performed.

[0062]The power feeding source VG supplies AC current of the resonance frequency fr1 to the feeding coil L2. The feedi...

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Abstract

To increase efficiency of wireless power feeding to a moving object in wireless power feeding of a magnetic field resonance type. A wireless power feeder includes a plurality of feeding coils and a power feeding source (power transmission control circuit) provided in common to the plurality of feeding coils and feeds power from the plurality of feeding coils to a receiving coil by wireless. The plurality of feeding coils are adjacently arranged such that coil surfaces thereof partially overlap each other.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to wireless power feeding and, more particularly, to arrangement of feeding coils or receiving coils.[0003]2. Description of Related Art[0004]A wireless power feeding technique of feeding power without a power cord is now attracting attention. The current wireless power feeding technique is roughly divided into three: (A) type utilizing electromagnetic induction (for short range); (B) type utilizing radio wave (for long range); and (C) type utilizing resonance phenomenon of magnetic field (for intermediate range).[0005]The type (A) utilizing electromagnetic induction has generally been employed in familiar home appliances such as an electric shaver; however, it can be effective only in a short range. The type (B) utilizing radio wave is available in a long range; however, it has small electric power. The type (C) utilizing resonance phenomenon is a comparatively new technique and is of part...

Claims

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Application Information

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Patent Type & AuthorityApplications(United States)
IPC IPC(8): H02J17/00
CPCH02J7/025H02J5/005B60L53/12H02J50/12Y02T10/70Y02T10/7072Y02T90/14H02J50/80H02J50/502H02J50/40Y02T90/12B60L5/005H01F27/006
InventorFUKUSHIMA, NORIYUKI
OwnerTDK CORPARATION