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Foreign object detection device, foreign object detection method, and non-contact charging system

A foreign object detection and detection circuit technology, which is applied in the direction of measuring devices, radio wave measurement systems, circuit devices, etc., can solve the problems of foreign object detection performance degradation, foreign object detection, detection coils and other problems

Active Publication Date: 2018-08-03
PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] As a result, the radiation resistance of the detection coil increases and the Q value decreases, resulting in a decrease in foreign object detection performance, and the detection coil cannot sufficiently function as an inductance, making it impossible to detect foreign objects.

Method used

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  • Foreign object detection device, foreign object detection method, and non-contact charging system
  • Foreign object detection device, foreign object detection method, and non-contact charging system
  • Foreign object detection device, foreign object detection method, and non-contact charging system

Examples

Experimental program
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Effect test

Embodiment approach 1

[0038] figure 2 It is a figure which shows the detailed structure of the foreign object detection apparatus 100 in Embodiment 1. The transmission circuit 101 generates high-frequency power (high-frequency power) of a predetermined frequency, and outputs the high-frequency power to a detection coil 103 described later via a coaxial cable 102 or the like that transmits a high-frequency unbalanced signal. The coaxial cable 102 is a transmission line in which the periphery of the central conductor is shielded with an outer conductor. The detection coil 103 is a coil that generates a high-frequency magnetic field for detecting the metal foreign object 201, and is composed of n (n is an integer equal to or greater than 2) coils L1, L2, . . . , Ln arranged.

[0039] The balun conversion circuit 104 is connected to a matching circuit 105 described later and the coaxial cable 102 , converts an unbalanced signal input from the coaxial cable 102 into a balanced signal, and outputs the ...

Embodiment approach 2

[0062] Below, yes Figure 7 Prevention of circuit damage in the foreign object detection device 200 shown will be described.

[0063] like figure 2 In this way, a non-contact charging system is configured by combining the foreign object detection device 100 , the power transmission coil 302 , and the high-frequency oscillation source 305 described in the first embodiment. The high-frequency oscillation source 305 supplies high-frequency power of a predetermined frequency to the power transmission coil 302 for non-contact charging.

[0064] Since the high-frequency oscillation source 305 transmits high power, if a magnetic field coupling occurs between the detection coil 103 and the power transmission coil 302, high power is input to the transmission circuit 101, the detection circuit 108, and the switch circuit 109, and each circuit is interrupted. risk of destruction. Therefore, the frequency of the high-frequency power output from the transmission circuit 101 is set to a...

Embodiment approach 3

[0068] Below, yes Figure 8 The mutual coupling reduction between the coils which comprise the detection coil 103 in the foreign object detection apparatus 300 shown will be demonstrated.

[0069] like Figure 4 As shown, since the plurality of detection coils 103 are arranged close to each other, mutual coupling occurs respectively. exist figure 2 In this case, when the coil L1 is selected among the detection coils 103 , unselected coils other than the coil L1 are coupled to the coil L1 to induce a current. As a result, the change in received power caused by the metal foreign object 201 becomes small, and the foreign object detection performance deteriorates.

[0070] Therefore, in this embodiment, if Figure 8 As shown, the two terminals of the unselected detection coil 103 are short-circuited by the short-circuit circuit 111 . In addition, the case where the short-circuit circuit 111 is provided between the matching circuit 105 and the parasitic capacitance 106 is sho...

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Abstract

The foreign matter detection device (100) includes: a detection coil (103); a transmission circuit (101) for generating an unbalanced signal; a balance-unbalance conversion circuit (104) for converting the unbalanced signal from the transmission circuit (101) into a balanced signal and a detection circuit (108) for detecting a foreign object based on a change in frequency characteristics of reflected power, which is a power component reflected from the detection coil (103). Even when the wiring between the detection coil (103) and the detection circuit (108) is long, foreign objects can be detected without operating the wiring as a wire antenna.

Description

technical field [0001] The invention relates to a foreign object detection device, a foreign object detection method and a non-contact charging system. Background technique [0002] In recent years, wireless power transmission systems (non-contact charging systems) have been developed for non-contact charging of, for example, electric vehicles. In the wireless power transmission system, a power transmitting coil and a high-frequency oscillation source are provided on the charging device side, and a power receiving coil is provided on the electric vehicle side. In addition, in the wireless power transmission system, by using the electromagnetic induction method, it is possible to realize highly efficient power transmission in a non-contact manner. [0003] In a wireless power transmission system based on an electromagnetic induction method, since a large amount of power is transmitted, if metal foreign objects are mixed between and / or around the power transmitting coil and t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V3/10H02J7/00H02J50/60
CPCG01V3/10H02J50/10H02J50/60H02J50/005
Inventor 宫下功宽
Owner PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD
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