Power Transmission Device

The power transmission device addresses the issue of unwanted radiation by grounding the resonant part and power transmission circuit, ensuring efficient and directional power transmission with reduced interference.

JP7740526B2Active Publication Date: 2025-09-17NIPPON TELEGRAPH & TELEPHONE CORP
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Patent Information

Application Number
JP2024513676
Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
Filing Date
2022-04-08
Publication Date
2025-09-17
Estimated Expiration
2042-04-08

AI Technical Summary

Technical Problem

Antennas using near-field resonance for wireless power transmission and contactless IC card communication radiate electric or magnetic field waves in directions that do not contribute to power transmission, causing electromagnetic noise and interference with nearby devices.

Method used

A power transmission device with an electric field antenna configured to have a resonant part and a ground connection, suppressing radiation in non-transmission directions by grounding the resonant part and power transmission circuit, allowing efficient power transmission only in the desired direction.

Benefits of technology

The device achieves directional power transmission with high efficiency, minimizing interference with external devices and reducing environmental impact, while also enabling smaller antenna size and lower costs.

✦ Generated by Eureka AI based on patent content.

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Patent Text Reader

Abstract

The purpose of the present disclosure is to suppress electric field radiation in directions that do not contribute to power transmission.　Therefore, the present disclosure is a power transmission device that transmits power, comprising an electric field antenna having a resonance unit that has an electrode, a ground, and a primary coil connecting the electrode and the ground, and resonates at an output frequency of a power transmission / reception circuit for power transmission, and a power feeding unit which has a secondary coil magnetically coupled to the primary coil and electrically connected to the power transmission / reception circuit, and to which the ground of the resonance unit and the ground of the power transmission / reception circuit are connected.
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Citation Information

Patent Citations

  • Reader / writer

    JP2008288845A

  • Communication system and communication device

    JP2008311960A

  • High-frequency power equipment, power transmission equipment, and power transmission systems

    JP2013532457A

  • Power transmission equipment and power transmission systems

    JP2013534124A