Wireless Power Transmission Device Charging Control
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Solution Overview
Problem
Conventional wireless charging systems face issues with multiple device charging, where power reception devices capable and incapable of limiting power reception coexist, leading to inefficient charging and potential overheating due to continued power transmission after completion, resulting in wasted energy and prolonged charging times.
Innovation Solution
A power transmission device equipped with a communication unit, determination unit, detection unit, and control unit that exchanges charging information, determines the power reception capability, detects charging completion, and controls power transmission to stop when a device incapable of limiting power reception has completed charging, and sends a power reception limiting command to capable devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If power transmission continues after a power reception device incapable of limiting power reception has completed charging, then the power reception device may continue receiving electric power, but this causes the electric power to transform into heat resulting in temperature rise and potential adverse effects
Solution Approach 1:
The power transmission device receives charging information from the power reception device and detects charging completion status. Based on this feedback, the control unit determines whether to continue or stop power transmission, preventing overheating by stopping transmission when charging is complete
Solution Approach 2:
The system determines in advance whether the power reception device is capable of limiting power reception. For devices incapable of limiting power reception, the system proactively stops power transmission upon detecting charging completion, preventing the harmful effect before it occurs
2Productivity
If power transmission continues after a power reception device has completed charging, then power may be distributed to other devices, but the electric power received by the completed device is wasted and reduces the time available for charging other devices
Solution Approach 1:
The system continuously monitors charging status of all power reception devices through exchanged charging information. When one device completes charging, the feedback triggers immediate cessation of power transmission, eliminating energy waste and allowing reallocation of power to other devices
Solution Approach 2:
The power transmission system dynamically adjusts its operation based on real-time charging status. Power transmission is actively maintained while devices are charging and automatically stopped when any device completes charging, optimizing energy distribution across multiple devices
3Loss of energy
If the system stops power transmission when any device completes charging, then energy waste and overheating are prevented, but the charging process must be restarted for completed devices extending overall charging time
Solution Approach 1:
The system segments the power reception devices into different groups based on their capability to limit power reception. Devices capable of limiting power reception can continue receiving power after charging completion, while devices incapable of limiting power reception have transmission stopped, allowing optimized handling of different device types
Solution Approach 2:
The control strategy is customized for each power reception device based on its individual capabilities. The system applies different control actions to different devices - stopping transmission for devices incapable of limiting power reception while maintaining transmission for capable devices, achieving localized optimization
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 overheating and ensures efficient charging by stopping power transmission to devices that have completed charging, optimizing energy distribution and reducing charging time for multiple devices.
Implementation Method 1
a magnetic resonance method utilizing an electromagnetic resonance phenomenon is known
Data Source
AI summary
A power transmission device includes a power transmission unit configured to transmit electric power to a plurality of power reception devices, a communication unit configured to exchange charging information with the plurality of power reception devices, a determination unit configured to determine based on the charging information, for each of the plurality of power reception devices, whether the power reception device is capable of limiting power reception, a detection unit configured to detect based on the charging information, for each of the plurality of power reception devices, completion of charging of the power reception device, and a control unit configured to perform control so that power transmission is stopped in a case where the detection unit detects that at least one power reception device incapable of limiting power reception has completed charging.