Wireless Power Resonator Frequency Tuning for Magnetic Field Control

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Solution Overview

Problem

Existing wireless power transmission systems do not effectively form a magnetic field space with a weaker magnetic field strength, which can lead to adverse effects such as Eddy currents and heat generation in electronic components.

Innovation Solution

A wireless power transmission apparatus that sets the power-source frequency to correspond with peak bands in the transmission characteristic of the power-supplying and power-receiving resonators, allowing for the formation of a magnetic field space with a magnetic field strength smaller than the surrounding field, and adjusts the magnetic coupling to control the size of this space.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If wireless power transmission is performed using resonance phenomenon between power-supplying and power-receiving resonators, then power transmission efficiency is improved, but magnetic field strength in the vicinity of the resonators increases causing Eddy currents and heat generation in electronic components

Engineering Contradiction:

Improvepower transmission efficiencyVSAvoidmagnetic field strength

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent applies parameter changes by adjusting the power-source frequency to correspond to peak bands in the transmission characteristic of the resonators. This frequency optimization enables effective power transmission while simultaneously reducing magnetic field strength in the vicinity of the resonators, thereby preventing Eddy currents and heat generation in electronic components.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent utilizes periodic action through resonance phenomenon between the power-supplying and power-receiving resonators. By operating at resonant frequencies with two peak bands, the system achieves efficient periodic energy transfer while controlling magnetic field exposure to surrounding electronic components.

Inventive Principle:

Principle #19Periodic action

2Reliability

If magnetic field strength is reduced to prevent Eddy currents and heat generation, then safety of electronic components is improved, but power transmission efficiency may deteriorate

Engineering Contradiction:

Improvesafety of electronic componentsVSAvoidpower transmission efficiency

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent resolves this contradiction through parameter changes by identifying and utilizing two peak bands in the transmission characteristic. By operating at these optimized frequency parameters, the system achieves both reduced magnetic field strength (improved safety) and maintained power transmission efficiency.

Inventive Principle:

Principle #35Parameter changes

3Productivity

If frequency setting is optimized for power transmission, then power transmission efficiency is improved, but magnetic field distribution becomes uneven causing localized heat generation

Engineering Contradiction:

Improvepower transmission efficiencyVSAvoidheat generation in electronic components

Core Design Contradiction:

ProductivityVSTemperature

Solution Approach 1:

The patent addresses this issue through parameter changes by selecting power-source frequencies that correspond to peak bands in the transmission characteristic. This frequency optimization creates a more uniform magnetic field distribution that reduces localized heat generation while maintaining efficient power transmission.

Inventive Principle:

Principle #35Parameter changes

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This approach reduces the occurrence of Eddy currents and heat generation in electronic devices by creating a magnetic field space with reduced magnetic field strength, enhancing the efficiency and safety of wireless power transmission.

Implementation Method 1

wireless power transmission technology that performs power transmission by means of resonance phenomenon (magnetic field resonant state) between resonators (coils) provided to the power-supplying module and the power-receiving module

Methodology Applied

Scientific EffectResonance phenomenon: Resonance

Implementation Method 2

power transmission by varying the magnetic field

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Implementation Method 3

Consequently, an Eddy Current occurs due to the magnetic field, thus generating heat in a stabilizer circuit, a charging circuit, a rechargeable battery, and other electronic components provided nearby

Methodology Applied

Scientific EffectEddy Current: Eddy Currents

Data Source

PatentUS10305328B2Wireless power transmission device capable of forming magnetic field space, and magnetic field space formation method

Publication Date: 2019.05.28 NITTO DENKO CORP

AI summary

A wireless power transmission device supplies power by means of a resonance phenomenon, from a power supply module equipped with at least a power-supply resonator to a power-receiving module equipped with at least a power-receiving resonator. For the power-supply resonator and the power-receiving resonator, a value for a transmission characteristic of a power source frequency for power is set so as to have two peak bands, and By setting the power source frequency for the power supplied to the power supply module to the power source frequency band corresponding to one of the two peak bands of the transmission characteristic, magnetic field spaces having a magnetic field strength less than the surrounding magnetic field strength are formed in the area near the power-supply resonator and the power-receiving resonator.