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Power transmitting device, power receiving device and wireless power transmission system

A power receiving device and wireless power technology, which is applied in the direction of circuit devices, electromagnetic measuring devices, measuring devices, etc., can solve the problems of metal foreign body heating and power transmission efficiency reduction, etc.

Active Publication Date: 2017-04-12
PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the above-mentioned wireless power transmission system, if the position of the power transmitting and receiving coil is shifted during power transmission, not only the power transmission efficiency will decrease, but also there is a risk of heating metal foreign objects outside the coil due to the leakage magnetic flux of the coil

Method used

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  • Power transmitting device, power receiving device and wireless power transmission system
  • Power transmitting device, power receiving device and wireless power transmission system
  • Power transmitting device, power receiving device and wireless power transmission system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0089] Figure 5 It is a block diagram showing a schematic configuration of the wireless power transmission system according to the first embodiment of the present invention. This wireless power transmission system includes a power transmitting device 100 and a power receiving device 200 , and can wirelessly transmit power from the power transmitting device 100 to the power receiving device 200 . The power transmission device 100 is, for example, a wireless charger, and the power reception device 200 may be, for example, a device including a secondary battery, such as a portable information terminal and an electric vehicle. In the present embodiment, the aforementioned position detection device is provided on the side of the power transmission device 100 . Therefore, the power transmitting apparatus 100 can not only transmit power to the power receiving apparatus 200 , but can also detect whether the position of the power receiving resonator 210 in the power receiving apparat...

Embodiment approach 2

[0145] Figure 8 It is a block diagram showing a schematic configuration of a wireless power transmission system according to the second embodiment of the present invention.

[0146] The basic configuration of the present embodiment is the same as that of the first embodiment, but differs in that the power transmission coil included in the power transmission resonator 110 and the detection coil for alignment are different coils. By separately providing a detection coil for alignment, not only does a switch between the power transmission resonator 110 and the oscillation circuit 150 become unnecessary, but the detection coil and the power transmission coil can be arranged at different positions, so that the power transmission device 100 can be designed with a degree of freedom. also raise.

[0147]In addition, in an environment where the power receiving coil moves during power transmission (for example, in-vehicle chargers and self-propelled robots supply power during driving)...

Embodiment approach 3

[0150] Figure 9 It is a block diagram showing a schematic configuration of a wireless power transmission system according to a third embodiment of the present invention.

[0151] The basic structure of this embodiment is the same as that of Embodiment 1, but the figure 1 The idea was changed to image 3 The concept is different in that the power receiving device 200 is equipped with an oscillation circuit 250 and a measuring circuit 260 for alignment, and the power transmitting resonator 110 is provided with a parallel capacitor and resonates at the resonance frequency fr.

[0152] The power receiving device 200 may be larger than the power transmitting device 100 in some cases. For example, a large power receiving device 200 such as a tablet terminal may be charged from a small power transmitting device 100 . In such a case, if the power transmitting device 100 has the prompting element 170 for alignment, the prompting element 170 is blocked by the power receiving device ...

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PUM

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Abstract

The invention provides a power transmitting device, a power receiving device and a wireless power transmission system. The power transmission device includes a first resonator including a first coil, detects the position of a power receiving device including a second resonator and a load, and the second resonator has a parallel resonance circuit including a second coil and a capacitor. The power transmission device includes: a first resonator; an oscillation circuit capable of operating at a first frequency (f1) lower than the resonance frequency (fr) of the second resonator and a second frequency (f2) higher than the resonance frequency (fr) Oscillate; measure the circuit and measure the input inductance of the first resonator. The measurement circuit detects the inductance value Lin(f1) of the first resonator and the inductance value Lin(f2) of the first resonator, based on the coupling coefficient ( k) Detecting the relative position of the second resonator with respect to the first resonator.

Description

technical field [0001] The present invention relates to a position detection device for detecting relative positions between resonators. In addition, the present invention also relates to a power transmission device, a power reception device, and a wireless power transmission system for wireless power transmission that includes such a position detection device and transmits electric power in a non-contact manner. Background technique [0002] In recent years, the development of various wireless power transmission systems for wireless charging in mobile electronic devices such as mobile phones and electric vehicles, and EV devices has been progressing. In the wireless power transmission technology, there are an electromagnetic induction method and a magnetic field resonance method in which a plurality of coils face each other, and an electric field coupling method in which a plurality of metal plates face each other. The electromagnetic induction wireless power transmission ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J50/12H02J50/00H02J50/80H02J50/90
CPCH02J50/90H02J50/12H02J7/00304G01B7/003G01B2210/58G01R27/2611
Inventor 浅沼健一山本浩司
Owner PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD