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Detecting device, power receiving device, contactless power transmission system, and detecting method

A detection device and detection part technology, applied in the direction of measuring devices, electromagnetic wave systems, radio wave measurement systems, etc., can solve the problems of high cost and imposing design restrictions, and achieve high metal foreign object detection, high precision, and realization of precision Effect

Active Publication Date: 2013-06-05
SONY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the detection method using a sensor, as in the magnetic resonance system, when the feeding range is wide, the cost is high
Also, for example, in the case of a temperature sensor, the output of the temperature sensor depends on the thermal conductivity of its surrounding environment, which imposes design constraints on devices on the power transmitting side and power receiving side

Method used

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  • Detecting device, power receiving device, contactless power transmission system, and detecting method
  • Detecting device, power receiving device, contactless power transmission system, and detecting method
  • Detecting device, power receiving device, contactless power transmission system, and detecting method

Examples

Experimental program
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no. 1 example

[0039] 2. First embodiment (detection section: an example including a resonance frequency adjuster and a first frequency remover)

[0040] 3. Second Embodiment (Separator: Example where a separator is provided on the load side of the resonance circuit)

[0041] 4. Third Embodiment (Frequency Remover: An Example in which a Second Frequency Remover is Provided Instead of a Separator)

[0042] 5. Other

[0043]

[0044] An embodiment of the present disclosure is a technique of measuring a quality factor (Q factor) of a circuit including a coil coupled to the outside when feeding power from a power transmitting side (primary side) to charge a power receiving side (secondary side); And based on the measurement result of the Q factor, it is judged whether there is a metal foreign object near the coil.

[0045] The Q factor is an index representing the relationship between energy retention and energy loss, and is generally used as a value representing the sharpness of the resonan...

no. 2 example

[0130] In order to accurately measure the Q factor of a resonant circuit, the impedance of the rectifier from the point of view of the resonant circuit should be high. For this purpose, as an example, the rectifier may be disconnected to be set in an open circuit state.

[0131] Therefore, in the second embodiment, the following example will be explained: for the power receiving device 20 according to the first embodiment (see figure 2 ) A separator for separating the load is provided so that the detection part can be separated from the load in Q factor measurement.

[0132] When the rectifier is disconnected, power cannot be received. However, even in this case, there is an advantage that the system does not need to go through a complicated control flow of stopping power transmission on the primary side. The power supply to the Q-factor measurement circuit in this case is driven by using the load 25 (battery, etc.) possessed on the secondary side or the charge stored in th...

no. 3 example

[0170] [Configuration example of power receiving device]

[0171] For example, when in figure 2 When the filter section is arranged in front of the rectifier 24 (resonant circuit side), although there is a possibility that the loss of the power transmission signal increases, the Q factor measurement can be performed without stopping the power reception.

[0172] Therefore, in the third embodiment, the power receiving device 20 according to the first embodiment (see figure 2 ) of the rectifier 24 (on the resonant circuit side) is provided with an example of a measurement signal removal filter unit 56 . This configuration makes the impedance on the rectifier side appear high to the Q-factor measurement signal.

[0173] Figure 15 is a circuit diagram showing a configuration example of a power receiving device according to a third embodiment of the present disclosure.

[0174] In the power receiving device 50 , a measurement signal removal filter section 56 is provided betw...

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Abstract

The invention relates to a detecting device, power receiving device, contactless power transmission system, and detecting method. Disclosed herein is the detecting device including a coil electromagnetically coupled to the external coil, a resonant circuit that includes at least the coil, and a detecting section that superimposes a measurement signal for measuring the Q-factor of the resonant circuit on a power transmission signal transmitted to the coil in a contactless manner and removes the power transmission signal from an alternating-current signal obtained by superimposing the measurement signal on the power transmission signal. The detecting section measures the Q-factor by using the alternating-current signal from which the power transmission signal is removed.

Description

technical field [0001] The present disclosure relates to a detection device, a power receiving device, a non-contact power transmission system, and a detection method for detecting the presence of a conductor such as metal. Background technique [0002] In recent years, non-contact power transmission systems that supply power in a non-contact manner (wireless power feeding) are being actively developed. As a system for realizing wireless power feeding, there are two techniques roughly classified. [0003] One is the well known electromagnetic induction system. In an electromagnetic induction system, the degree of coupling between the power transmitting side and the power receiving side is very high, and it is possible to realize high-efficiency power feeding. However, it is necessary to keep the coupling coefficient between the power transmitting side and the power receiving side high. Therefore, when the distance between the power transmitting side and the power receivin...

Claims

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Application Information

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IPC IPC(8): G01V3/10G01R27/26H02J17/00H02J7/00
CPCH02J7/025H02J5/005H01F38/14G01R27/04H02J50/12H02J50/60G01R27/2688G01V3/101H02J50/80H02J50/10G01V3/02
Inventor 文仙启吾中野裕章村上知伦福田伸一
Owner SONY CORP
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