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wireless power transfer system

A wireless power transmission, power technology, applied in circuits, inductors, electrical components, etc.

Active Publication Date: 2021-02-26
TDK CORPARATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the stable control of the output of the rectifier, it is necessary to monitor the status of the power receiving side on the power transmitting side, but in the wireless power transmission technology, the power transmitting side unit and the power receiving side unit are physically separated from each other and communication through wired connections is not possible. device to monitor the status of the receiving side is considered a problem

Method used

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no. 1 approach

[0031] First, refer to figure 1 and figure 2 , the overall configuration of the wireless power transmission system S1 according to the first embodiment of the present invention will be described. figure 1 It is a block diagram showing the configuration of the wireless power transmission system according to the first embodiment of the present invention together with an AC power supply PW and a load R. figure 2 is enlarged figure 1 The shown partial enlarged view of area A1 in the wireless power transmission system according to the first embodiment of the present invention.

[0032] Such as figure 1 As shown, the wireless power transmission system S1 has a power transmitting device Ut and a power receiving device Ur.

[0033] The power transmission device Ut has a DC power supply PS, an inverter INV, a power transmission coil unit Ltu, a current detection circuit Dtu, a controller Stu, and a wireless reception module Wtu. The power receiving device Ur has a rectifier DB, ...

no. 2 approach

[0055] Next, a wireless power transmission system according to a second embodiment of the present invention will be described. In this embodiment, in the operation of the wireless power transmission system S1 according to the first embodiment, small power supply is performed using at least two or more different output voltages of the rectifier DB instead of a desired output voltage of the rectifier DB. is different from the first embodiment. In addition, the configuration of the wireless power transmission system according to the present embodiment is the same as that of the wireless power transmission system S1 according to the first embodiment. Hereinafter, description will focus on points different from the first embodiment.

[0056] The operation of the wireless power transmission system of this embodiment is divided into two steps. First, the first step is to obtain a small power supply of the peak value of the AC current flowing through the power transmission coil Lt c...

no. 3 approach

[0063] Next, refer to image 3 , the wireless power transmission system according to the third embodiment of the present invention will be described. image 3 is equivalent to zooming in figure 1In the shown partial enlarged view of the area A1 in the wireless power transmission system according to the first embodiment of the present invention, an enlarged partial enlargement of the area A1 in the wireless power transmission system according to the third embodiment of the present invention is shown. picture. The wireless power transmission system according to the third embodiment differs from the first embodiment in that the power transmission coil unit Ltu further includes a power transmission side resonant capacitor Ct in addition to the power transmission coil Lt. In addition, the configuration and operation of the wireless power transmission system according to the third embodiment other than those described above are the same as those of the wireless power transmission ...

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PUM

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Abstract

In the wireless power transmission system of the present invention, the power transmission device includes: a power transmission coil that receives power to generate an AC magnetic field; an inverter that supplies the AC power to the power transmission coil at a predetermined drive frequency; A current detection circuit for peak value of alternating current; and a controller for controlling alternating current flowing in the power transmission coil, the power receiving device includes: a power receiving coil for wirelessly receiving power through an alternating current magnetic field; and a power receiving side LC resonance circuit is formed together with the power receiving coil and a rectifier that rectifies the power received by the power receiving coil, the controller adjusts the drive frequency to be approximately the same as the resonant frequency of the power receiving side LC resonant circuit, and controls the alternating current flowing in the power transmitting coil. for certain.

Description

technical field [0001] The present invention relates to a wireless power transmission system. Background technique [0002] There is known a wireless power transmission technology that utilizes magnetic coupling between opposing primary (power transmitting) coils and secondary (power receiving) coils to wirelessly transmit energy of an alternating current given from a primary coil to a secondary coil. [0003] In this wireless power transmission technology, when the state of the magnetic coupling between the primary coil and the secondary coil or the state of the load changes, the output of the rectifier becomes unstable, and it is necessary to control the output of the rectifier to a predetermined value. The voltage or current or power does not exceed the range that the components of the output stage can use. However, in the stable control of the output of the rectifier, it is necessary to monitor the status of the power receiving side on the power transmitting side, but i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J50/12H01F38/14
CPCH01F38/14H02J50/12H02J50/80
Inventor 伊井彰宏大嶋一则小泽恭弘松浦研
Owner TDK CORPARATION
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