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Coil unit and apparatus for detecting foreign matter

A technology of foreign matter detection and coil unit, which is applied in the direction of measuring devices, circuit devices, battery circuit devices, etc., can solve the problem of heat generation of foreign objects, achieve the effects of suppressing multiple resonance frequencies, improving detection accuracy, and suppressing the reduction of Q value

Active Publication Date: 2015-06-03
TDK CORPARATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, when the power is transmitted in a non-contact form, if a foreign object is mixed into the gap between the power supply coil and the power receiving coil, if the foreign object is a metal, an eddy current generated by a magnetic flux passing through the metal foreign object, and When the foreign object is a magnetic body, there is a possibility that the foreign object may generate heat due to hysteresis loss caused by the magnetic flux passing through the magnetic object.

Method used

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  • Coil unit and apparatus for detecting foreign matter
  • Coil unit and apparatus for detecting foreign matter
  • Coil unit and apparatus for detecting foreign matter

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no. 1 Embodiment approach

[0043] Next, refer to figure 2 as well as image 3 Furthermore, the configuration of the power feeding coil unit L100 according to the preferred first embodiment of the present invention will be described in detail. figure 2 It is a schematic configuration diagram of the feeding coil unit according to the first embodiment of the present invention seen from the top. image 3 is along figure 2 A schematic cut-away end view of the power supply coil unit of the I-I line in .

[0044] Power supply coil unit L100 as figure 2 It shows a power supply coil L1 (coil for power transmission), a foreign object detection device D100, a signal generator SG, and a frequency characteristic analyzer A100.

[0045] Power supply coil L1 as figure 2 The shown one is substantially square, and is formed by winding about 2000 litz wires of φ0.1 (mm) insulated copper wires, for example, from several turns to tens of turns. That is, the feeding coil L1 is a so-called helical coil formed in a...

no. 2 Embodiment approach

[0057] Next, refer to Figure 4 Furthermore, the configuration of the feeding coil unit L200 according to the second embodiment of the present invention will be described in detail below. Figure 4 is equivalent to image 3 The feed coil unit according to the first embodiment of the present invention is shown along figure 2 A schematic cut-away end view of the power supply coil unit according to the second embodiment of the present invention of the schematic cut-out end face of the I-I line in FIG.

[0058] The power supply coil unit L200 is equipped with the power supply coil L1, the foreign object detection apparatus D200, the signal generator SG, and the frequency characteristic analyzer A100 similarly to the power supply coil unit L100 which concerns on 1st Embodiment. The configurations of the feeding coil L1, the signal generator SG, and the frequency characteristic analyzer A100 are the same as those of the feeding coil unit L100 according to the first embodiment. I...

no. 3 Embodiment approach

[0064] Next, refer to Figure 5 ~ Figure 7 Furthermore, the configuration of the feeding coil unit L300 according to the third embodiment of the present invention will be described in detail below. Figure 5 It is a schematic configuration diagram in which the feeding coil unit according to the third embodiment of the present invention is seen from the top. Figure 6 is along Figure 5 A schematic cutaway end view of the power supply coil unit of line II-II in . Figure 7 It is a system configuration diagram of a signal generator, a foreign object detection device, and a foreign object detection system in a power supply coil unit according to a third embodiment of the present invention.

[0065] The power supply coil unit L300 is provided with the power supply coil L1, the foreign object detection device D300, the signal generator SG, and the foreign object detection system S100 similarly to the power supply coil unit L100 which concerns on 1st Embodiment. The configuration...

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Abstract

The present invention aims to provide a coil unit for improving an accuracy in detecting foreign matter and an apparatus for detecting foreign matter which improves the accuracy in detecting foreign matter when a power is transmitted in a contactless manner. A power feeding coil unit L100 (a coil unit) of the present invention is provided with a power feeding coil L1 (a coil for power transmission) and an apparatus D100 for detecting foreign matter. The apparatus D100 for detecting foreign matter is provided with a plurality of resonators R1 having a resonator coil M1 and a resonator capacitor C1 and also an excitation coil E1 for exciting the plurality of resonators R1. The plurality of resonators R1 are disposed to cover at least an area interlinking with a magnetic flux generated by the power feeding coil L1 and to decrease an influence of mutual inductance.

Description

technical field [0001] The present invention relates to a coil unit and a foreign object detection device. Background technique [0002] A non-contact power transmission technology that supplies power without using a power cord is attracting attention. Current non-contact power transmission technologies are mainly of the type utilizing electromagnetic induction, and applications in various fields are expected. [0003] From such a background, for example, an electric vehicle is equipped with a power receiving coil (power receiving side) in the lower part of the vehicle, and a large power (for example, several kW to several 10kW) is also being considered, and if this non-contact power transmission technology is used, power transmission can be performed without mechanically connecting the power supply side and the power receiving side. [0004] However, when the power is transmitted in a non-contact form, if a foreign object is mixed into the gap between the power supply coi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J17/00G01N27/72H01F38/14H02J50/00H02J50/12H02J50/60
CPCH02J7/025G01N27/72H01F38/14H01F2038/146G01V3/105H01F27/402G01N27/025H02J50/12H02J50/60
Inventor 浦野高志
Owner TDK CORPARATION