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Wireless power feeder and wireless power transmission system

a technology of wireless power transmission system and wireless power feeder, which is applied in the direction of transformer/inductance circuit, transformer/inductance details, inductance, etc., can solve the problem of not being able to feed big electric power, and achieve the effect of safe wireless power feeding of magnetic field resonance typ

Active Publication Date: 2014-04-08
TDK CORPARATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0019]By making current to alternately flow in the first coil bi-directionally, AC power can be fed from the first coil of the power transmission control circuit to second coil of the exciting circuit or feeding coil circuit. This configuration eliminates the need to provide a resonance circuit in the power transmission control circuit itself, thus eliminating the need to connect a capacitor in series to the first coil. This makes it easy to apply high voltage to the first coil, facilitating suppression of voltage to be applied to a switch such as a MOSFET. Further, by adjusting the ratio of the number of windings between the first and second coils, the magnitude of voltage to be fed to the second coil can be adjusted.
[0021]Rectifying AC voltage in the rectification circuit allows the capacitor to be charged by an AC power supply. By using the capacitor as a DC voltage source, it is possible to make the most of the power supply voltage of the AC power supply. This facilitates setting of high input voltage.
[0024]The input voltage of the power transmission control circuit may be applied to one of a series circuit composed of the first coil and first switch and a series circuit composed of the first coil and second switch. Setting the inductance of the first coil to a large value easily prevents excessive voltage from being applied to the first or second switch.
[0030]According to the present invention, even in the case where high voltage is input, wireless power feeding of a magnetic field resonance type can be performed safely.

Problems solved by technology

The type (B) utilizing radio wave is available in a long range; however, it cannot feed big electric power.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

first embodiment

[First Embodiment]

[0040]FIG. 1 is a view illustrating operation principle of a wireless power transmission system 100 according to the first embodiment. The wireless power transmission system 100 in the first 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.

[0041]The power feeding LC resonance circuit 300 includes a capacitor C2 and a feeding coil L2. The power receiving LC resonance circuit 302 includes a capacitor C3 and a receiving coil L3. The values of the capacitor C2, feeding coil L2, capacitor C3, and receiving coil L3 are set such that the resonance frequencies of the feeding LC resonance circuit 300 and receiving LC resonance circuit 302 coincide with each other in a state where ...

second embodiment

[Second Embodiment]

[0081]FIG. 6 is a view illustrating operation principle of the wireless power transmission system 100 according to a second embodiment. As in the case of the first embodiment, the wireless power transmission system 100 according to the second embodiment includes the wireless power feeder 116 and wireless power receiver 118. However, although the wireless power receiver 118 includes the power receiving LC resonance circuit 302, the wireless power feeder 116 does not include the power feeding LC resonance circuit 300. That is, the power feeding coil L2 does not constitute a part of the LC resonance circuit. More specifically, the power 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 power feeding coil L2. Thus, the power feeding coil L2 does not resonate in a frequency at which power transmission is performed.

[0082]The power feeding so...

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Abstract

Power is fed from a feeding coil L2 to a receiving coil L3 by magnetic resonance. An oscillator 202 alternately turns ON / OFF switching transistors Q1 and Q2 to cause AC current IS of drive frequency fo to flow in a transformer T2 primary coil Lb. The AC current IS causes AC current I1 to flow in an exciting coil L1 and causes AC current I2 to flow in the feeding coil L2.

Description

RELATED APPLICATIONS[0001]This application is a Continuation-In-Part (CIP) of U.S. application Ser. No. 12 / 899,130, filed Oct. 6, 2010 claiming priority of Japanese Application No. 2010-151649, filed Jul. 2, 2010. The entire contents of each of the foregoing applications are hereby incorporated by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to a wireless power feeder for feeding power by wireless and a wireless power transmission system.[0004]2. Description of Related Art[0005]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).[0006]The type (A) utilizing electromagnetic induction has generally been empl...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): H01F27/42H01F37/00H01F38/00
Inventor URANO, TAKASHI
Owner TDK CORPARATION