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Wireless power transmission device, method for adjusting load fluctuation response of input impedance in wireless power transmission device, and method for manufacturing wireless power transmission device

A technology of wireless power transmission and load variation, which is applied to circuit devices, battery circuit devices, electric vehicles, etc., and can solve problems such as the increase in the value of load impedance

Inactive Publication Date: 2015-10-28
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Furthermore, in the case of charging a lithium-ion secondary battery with a constant current constant voltage charging method by using the above-mentioned wireless power transmission device for wireless power transmission, when the constant current charging is changed to the constant voltage charging, the supplied current The value decays, and the value of the load impedance of the powered equipment (including rechargeable batteries, stabilizing circuits, charging circuits, etc.) including rechargeable batteries increases

Method used

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  • Wireless power transmission device, method for adjusting load fluctuation response of input impedance in wireless power transmission device, and method for manufacturing wireless power transmission device
  • Wireless power transmission device, method for adjusting load fluctuation response of input impedance in wireless power transmission device, and method for manufacturing wireless power transmission device
  • Wireless power transmission device, method for adjusting load fluctuation response of input impedance in wireless power transmission device, and method for manufacturing wireless power transmission device

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Embodiment approach

[0054] Next, embodiments of the wireless power transmission device, the method of adjusting the load change responsiveness of the input impedance in the wireless power transmission device, and the manufacturing method of the wireless power transmission device according to the present invention will be described. First, the wireless power transmission device 1 used in this embodiment will be described.

[0055] (Structure of wireless power transmission device 1)

[0056] Such as figure 1 As shown, the wireless power transmission device 1 includes a power supply module 2 including a power supply coil 21 and a power supply resonator 22 , and a power receiving module 3 including a power receiving coil 31 and a power receiving resonator 32 . Furthermore, an AC power source 6 having an oscillation circuit for setting the driving frequency of electric power supplied to the power supply module 2 to a predetermined value is connected to the power supply coil 21 of the power supply mo...

other Embodiment approach

[0223] In the description of the above-mentioned manufacturing method, the wireless headphone 200 was exemplified and described, but as long as it is a device equipped with a rechargeable battery, it can also be used in a tablet PC, a digital camera, a mobile phone, and a headphone-type music player. , hearing aids, sound collectors, etc.

[0224] In addition, in the above description, the wireless power transmission device 1 that uses the resonance phenomenon (magnetic field resonance state) between the resonators (coils) included in the power supply module 2 and the power reception module 3 to couple the magnetic field to perform power transmission was exemplified. The description will be given, but it can also be applied to the wireless power transmission device 1 that performs power transmission using electromagnetic induction between coils.

[0225] In addition, in the above description, the case where the wireless power transmission device 1 is mounted on a portable elec...

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Abstract

In order to adjust the load fluctuation response of an input impedance (Zin) (i.e., a change in the value of an input impedance in a wireless power transmission device relative to the unit variation of a load impedance (Z1) of a device to be supplied with power) in a wireless power transmission device (1) wherein a magnetic field is altered to supply power from a power supply module (2) to a power-receiving module (3) to which devices to be supplied with power (i.e., a stabilizing circuit (7), a charging circuit (8) and a lithium-ion secondary battery (9)) are connected, the value of a coupling coefficient (k12) between a power supply coil (21) and a power supply resonator (22), and the value of a coupling coefficient (k34) between a power-receiving resonator (32) and a power-receiving coil (31) are each adjusted.

Description

technical field [0001] The present invention relates to a wireless power transmission device, a method of adjusting responsiveness to load fluctuations of input impedance in the wireless power transmission device, and a method of manufacturing the wireless power transmission device. Background technique [0002] In recent years, notebook PCs (Personal Computers), tablet PCs, digital cameras, mobile phones, portable game consoles, headphone music players, wireless headphones, hearing aids, recorders, etc. The use of portable electronic devices is rapidly gaining popularity. Furthermore, most of these portable electronic devices are equipped with rechargeable batteries, and need to be charged periodically. In order to simplify the charging operation of the rechargeable battery of the electronic device, the power supply technology (wireless power transmission technology that changes the magnetic field and transmits power) is used between the power supply device and the power r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J17/00H01F38/14H02J7/00
CPCH02J17/00H02J50/12H02J7/00302
Inventor 畑中武蔵津田尚
Owner NITTO DENKO CORP