Wireless Power Transmission Efficiency Control via Feedback
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Solution Overview
Problem
Existing power transmission systems using electromagnetic induction or magnetic field resonance methods face inefficiencies, leading to power radiation and heat emission when the power reception device is not properly aligned, resulting in reduced transmission efficiency and potential harm to humans and electronic devices.
Innovation Solution
A power transmission apparatus with a power transmission device that includes a power transmission unit, a detecting unit to measure transmission amount, and a controller that calculates efficiency based on detected values, stopping power transmission when efficiency falls below a threshold to prevent radiation and heat emission, and a power reception device with a dummy load to adjust resistance for accurate efficiency calculation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If power transmission is performed using electromagnetic induction or magnetic field resonance methods, then power can be transmitted non-contactly, but power radiation and heat emission occur when the power reception device is not properly aligned
Solution Approach 1:
The system continuously monitors power transmission efficiency by detecting the power reception amount and comparing it with the power transmission amount. When efficiency falls below a threshold, the system provides feedback to stop power transmission, preventing harmful radiation and heat emission while enabling safe non-contact power transmission.
Solution Approach 2:
The power transmission control is made dynamic by continuously calculating transmission efficiency and adjusting the power transmission state in real-time. The system transitions between transmitting and stopping power based on the calculated efficiency, adapting to the alignment state between transmission and reception devices.
2Object-affected harmful factors
If power transmission is stopped when efficiency is low to prevent harm, then safety is improved, but power transmission reliability deteriorates due to premature stopping
Solution Approach 1:
The system uses a threshold value for power transmission efficiency to determine when to stop transmission. By adjusting this threshold parameter, the system can balance between preventing harmful effects and maintaining transmission reliability. The threshold acts as a controllable parameter that defines the boundary between safe and unsafe operating conditions.
3Device complexity
If communication units are used to detect power reception state, then power transmission control is simplified, but accurate efficiency calculation is impossible without considering load conditions
Solution Approach 1:
The system introduces a dummy load as an intermediary element to enable accurate efficiency measurement. The dummy load allows the system to calculate power transmission efficiency by comparing the power reception amount under known load conditions, providing a reference for accurate measurement without significantly increasing system complexity.
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
Prevents power radiation and heat emission by dynamically controlling power transmission based on calculated efficiency, ensuring safe and efficient energy transfer even when the power reception device is not optimally aligned.
Implementation Method 1
The power transmission apparatus transmits power from the power transmission device to the power reception device using an electromagnetic induction method, a magnetic field resonance method, an electric field resonance method, or the like.
Implementation Method 2
The power transmission apparatus transmits power from the power transmission device to the power reception device using an electromagnetic induction method, a magnetic field resonance method, an electric field resonance method, or the like.
Implementation Method 3
a power transmission amount detecting unit that detects a power transmission amount transmitted by the power transmission unit
Data Source
AI summary
A power transmission apparatus includes a power transmission device having a power transmission amount detecting unit that transmits power and detects a power transmission amount, a power transmission device communication unit that communicates with a power reception device, and a power transmission device controller that calculates power transmission efficiency from the power transmission amount and a power reception amount and stops transmitting power if it is determined that a relationship between the power transmission amount and the power transmission efficiency lies out of an operable region, and the power reception device having a power reception amount detecting unit that receives power from the power transmission device and detects the power reception amount, a power reception device communication unit that communicates with the power transmission device, and a power reception device controller that transmits the power reception amount to the power transmission device via the power reception device communication unit.