Wireless Power Transmission Timing for Communication Coexistence

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Solution Overview

Problem

Existing wireless power transmission systems face inefficiencies due to interference with wireless communication systems and reduced power supply efficiency when multiple devices operate in close proximity, as they often require longer carrier sense periods that decrease channel availability for wireless communication.

Innovation Solution

A method and device that synchronize wireless power transmission by waiting for a channel to be clear for a predetermined period and then transmitting power after a waiting period, ensuring coexistence with wireless communication systems and improving power supply efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If wireless power transmission devices perform carrier sense for a long period to avoid interference, then reliability of coexistence with wireless communication is improved, but channel availability and power supply efficiency deteriorate

Engineering Contradiction:

Improvecoexistence with wireless communicationVSAvoidpower supply efficiency

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent implements periodic carrier sense operations with defined cycles (first period for sensing, second period for waiting, third period for transmission). This periodic structure allows multiple devices to systematically share channel access, improving both coexistence reliability and overall power supply efficiency by preventing continuous interference while maximizing transmission opportunities.

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The patent performs carrier sense and channel clear verification before actual power transmission begins. By conducting these preliminary checks and waiting for the channel to be clear for a specified duration, devices ensure reliable coexistence with wireless communication systems while optimizing the timing of power transmission to maximize channel utilization.

Inventive Principle:

Principle #10Preliminary action

2Productivity

If multiple wireless power transmission devices operate simultaneously, then power supply efficiency is improved, but interference with wireless communication systems increases

Engineering Contradiction:

Improvepower supply efficiencyVSAvoidinterference with wireless communication

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

Multiple wireless power transmission devices operate in synchronized periodic cycles, performing carrier sense during first periods, waiting during second periods, and transmitting during third periods. This coordination enables simultaneous operation of multiple devices while maintaining regular intervals that prevent continuous interference with wireless communication systems.

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

Each device performs preliminary carrier sense and channel clear verification before transmission, ensuring that power transmission only occurs when the channel is confirmed clear for wireless communication. This preliminary check mechanism allows multiple devices to operate simultaneously without causing harmful interference.

Inventive Principle:

Principle #10Preliminary action

3Reliability

If carrier sense period is extended to ensure channel clear status, then coexistence with wireless communication is improved, but channel availability for power transmission decreases

Engineering Contradiction:

Improvecoexistence with wireless communicationVSAvoidchannel availability

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent structures channel access into periodic cycles with defined durations for carrier sense, waiting, and transmission. This periodic approach ensures reliable detection of wireless communication activity while minimizing idle time through optimized period lengths, balancing coexistence reliability with channel availability for power transmission.

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The patent performs carrier sense and channel clear verification as preliminary actions before power transmission, but limits these checks to specific predetermined periods rather than continuous monitoring. This approach ensures reliable coexistence while reducing time loss by concentrating sensing activities in defined intervals rather than extending them continuously.

Inventive Principle:

Principle #10Preliminary action

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 enhances power supply efficiency by allowing simultaneous power transmission from multiple devices, creating idle times for wireless communication and reducing interference, thus optimizing channel usage.

Implementation Method 1

a wireless power transmission device that transmits power by transmitting a radio wave to a space

Methodology Applied

Scientific EffectElectromagnetic radiation: Electromagnetic Induction

Data Source

PatentUS20250343444A1Wireless power transmission method and wireless power transmission device

Publication Date: 2025.11.06 PANASONIC HOLDINGS CORP

AI summary

With regards to wireless power transmission, the present invention enables coexistence with wireless communication and enables improvement in power feeding efficiency. This wireless power transmission method for transferring electric power by emitting a radio wave into space involves emitting a radio wave into space, when a state where another radio wave has not been transferred in the space continues for at least a first period, after standing by for a second period.