Sub-Surface Wireless Charging With Receiver Movement Detection
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Solution Overview
Problem
Existing wireless charging systems face safety risks and inefficiencies due to the lack of effective movement detection mechanisms, which can lead to excessive power transfer and potential damage or hazards when the wireless power receiver moves closer to the transmitter during charging.
Innovation Solution
A sub-surface wireless charging system that incorporates sensors, such as light sensors and differential coils, to detect movement and adjust power transfer accordingly, preventing damage by stopping or reducing power when the receiver moves closer to the transmitter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wireless power transmission is performed without movement detection, then power transfer efficiency is maintained, but safety hazards occur due to excessive power transfer when receiver moves closer to transmitter
Solution Approach 1:
The patent implements preliminary action by detecting the presence and position of the wireless power receiver before initiating full power transmission. The system uses sensors to detect the receiver's approach and establishes a safe operating distance threshold in advance, preventing excessive power transfer before it can occur.
Solution Approach 2:
The patent applies feedback by continuously monitoring the receiver's position during power transmission and adjusting the transmitted power level accordingly. When the receiver moves closer than the safe threshold distance, the system reduces or stops power transmission, creating a closed-loop safety mechanism.
2Reliability
If sensors are added to detect movement, then safety is improved, but device complexity increases
Solution Approach 1:
The patent uses an intermediary approach by introducing sensors as mediator components between the transmitter and receiver. These sensors detect the receiver's position and relay this information to the control system, enabling safety monitoring without requiring direct complex interaction between the power transmission components.
Solution Approach 2:
The patent replaces mechanical movement detection with optical or electromagnetic sensing. Instead of using mechanical switches or physical contact sensors, the system uses light sensors or other non-contact detection methods to monitor the receiver's position, reducing mechanical complexity while improving reliability.
3Productivity
If power transmission continues without interruption, then productivity is maintained, but harmful effects occur from excessive power transfer
Solution Approach 1:
The patent applies dynamics by making the power transmission level adaptive rather than static. The system continuously adjusts the transmitted power based on the receiver's real-time position, allowing maximum power transfer when the receiver is at the optimal distance and reducing power when the receiver moves too close, thus preventing harmful effects while maintaining charging efficiency.
Solution Approach 2:
The patent implements preliminary anti-action by detecting potential harmful conditions (receiver too close to transmitter) before they manifest and taking preventive action. The system stops or reduces power transmission before excessive power transfer can occur, eliminating the harmful effect rather than correcting it after the fact.
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
The system effectively prevents excessive power transfer and potential hazards by accurately detecting movement and adjusting power levels, ensuring safe and efficient wireless charging operations.
Implementation Method 1
The magnetic field generated by transmitting coil LTX as a result of the flow of current ITX induces current IRX to flow through LC tank 108
Implementation Method 2
a ferrite core; a housing disposed between the transmitting coil and the wireless power transmission space, where the ferrite core is disposed between the transmitting coil and the housing
Data Source
AI summary
In an embodiment, a method includes: wirelessly transmitting power to a receiving coil from a transmitting coil, where the receiving coil is in a wireless power transmission space of the transmitting coil; measuring an output of a sensor during a first time to generate a first measurement; measuring the output of the sensor during a second time to generate a second measurement, the second time being after the first time; and when a magnitude of a difference between the first measurement and the second measurement is higher than a predetermined threshold, stopping wirelessly transmitting power to the receiving coil with the transmitting coil.