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Wireless energy transfer device and wireless energy transfer system

A technology of wireless power supply and electric field, applied in the direction of circuit devices, electromagnetic wave systems, transmission systems, etc., can solve the problem of low power utilization efficiency and achieve the effect of reducing the circuit area

Inactive Publication Date: 2013-06-05
ADVANTEST CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The electromagnetic wave receiving type can transmit power of several watts or less in the frequency band between medium wave and microwave, but the power utilization efficiency is low

Method used

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  • Wireless energy transfer device and wireless energy transfer system
  • Wireless energy transfer device and wireless energy transfer system
  • Wireless energy transfer device and wireless energy transfer system

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach ）

[0045] figure 2 It is a circuit diagram showing the configuration of the wireless power feeding system 100 according to the first embodiment. The wireless power supply system 100 includes: a wireless power supply device 200 and a wireless power receiving device 300 .

[0046] First, the structure of the wireless power receiving device 300 will be described. The wireless power receiving device 300 receives the power signal S1 transmitted from the wireless power supply device 200 . The wireless power receiving device 300 includes: a receiving coil L R , Resonant capacitor C R , Load circuit 20. Resonant capacitor C R with receiving coil L R Together they form a resonant circuit. The resonant frequency of the resonant circuit is tuned to the power signal S1.

[0047] Receiving coil L R The power signal S1 from the wireless power supply device 200 is received. The induced current (resonant current) I corresponding to the power signal S1 R Flow through the receiving coil...

no. 2 approach ）

[0071] In the first embodiment, the power supply device has been described. In the second embodiment, a power receiving device that can be used in combination with the power supply device according to the first embodiment or can be used alone is described.

[0072] Figure 8 It is a circuit diagram showing the configuration of the wireless power feeding system 100 according to the second embodiment. Although circuit constants are illustrated in this circuit diagram, these numerical values ​​do not limit the present invention. The wireless power supply system 100 includes a wireless power supply device 200 and a wireless power receiving device 300 . First, the configuration of the wireless power feeding device 200 will be described.

[0073] The wireless power supply device 200 transmits a power signal to the wireless power receiving device 300 . The wireless power supply system 100 utilizes the near field (electric field, magnetic field, or electromagnetic field) of electr...

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PUM

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Abstract

A wireless energy transfer device (200) transmits an electric signal (S1) generating any of an electric field, a magnetic field, and an electromagnetic field. A bridge circuit (14) includes a plurality of switches (SW1, SW2). A controller (12) controls the switches (SW1, SW2) of the bridge circuit (14) at a first frequency (f1)which is a transmit frequency. A transmission coil (LT) and a resonant capacitor (CT) configure a resonant antenna connected to the bridge circuit (14) and resonate at a second frequency (f2) being not less than the first frequency (f1). The controller (12) is configured to control the length of dead time (Td) at which the switches (SW1, SW2) are all turned off.

Description

technical field [0001] The invention relates to a wireless power supply technology. Background technique [0002] In recent years, wireless (non-contact) power transmission has attracted attention as a power supply technology for electronic devices such as mobile phones and notebook computers, or electric vehicles. Wireless power transmission is mainly divided into three types: electromagnetic induction type, electromagnetic wave receiving type, and electric field / magnetic field resonance type. [0003] Electromagnetic induction is used to supply power over short distances (within a few centimeters) and is capable of transmitting hundreds of watts in frequency bands below hundreds of kHz. The utilization efficiency of electric power is about 60% to 98%. When power is supplied over a relatively long distance of several meters or more, an electromagnetic wave receiving type is used. The electromagnetic wave receiving type can transmit electric power of several watts or less...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J17/00
CPCH02J5/005H02J50/12H02J50/50H02J50/005H04B5/0037H04B5/0081
Inventor 圆道祐树古川靖夫
Owner ADVANTEST CORP
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