Wireless Charging Auto-Detection via Inductive Field Feedback
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Solution Overview
Problem
Current wireless charging systems lack an auto-detection mechanism for under-charged devices, leading to inefficient energy usage and potential fire hazards from faulty or damaged devices.
Innovation Solution
A wireless charging system with an inductive loop comprising an induction coil and capacitor, connected to a power loop and a control loop that includes a processor and detection circuit, allowing for the detection of an induced electric field to determine if a device is present and adjust power supply accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a timing charging method is used in wireless charging system, then the charging operation is simple to implement, but electricity is wasted and fire accidents may occur from under-charged or faulty devices
Solution Approach 1:
The patent implements a feedback mechanism by detecting the electric field generated by the receiver coil. The processor continuously monitors the electric field strength and compares it against threshold values to determine charging status. This feedback loop enables the system to automatically adjust power supply based on actual device presence and charging completion, eliminating electricity waste from timing-based charging while maintaining operational simplicity.
2Ease of manufacture
If a timing charging method is used in wireless charging system, then the charging operation is simple to implement, but fire accidents may occur from faulty or damaged devices
Solution Approach 1:
The feedback mechanism detects electric field characteristics that indicate device presence, proper connection, and charging completion. By monitoring these parameters in real-time, the system can identify faulty or damaged devices and terminate charging before fire hazards develop, thereby improving safety while keeping the operation simple.
Solution Approach 2:
The system performs preliminary detection of the electric field before initiating full power charging. This preliminary action allows the system to verify device presence and suitability for charging in advance, preventing fire accidents from faulty devices while maintaining simple user operation.
3Area of stationary object
If the distance between charger and electric receiver device is farther, then the wireless charging coverage area is increased, but the charging efficiency decreases requiring resonant inductive coupling
Solution Approach 1:
The patent employs parameter changes by adjusting the resonant frequency of both the transmitter and receiver coils to match. This frequency tuning enables efficient energy transfer over extended distances, expanding the charging coverage area while maintaining acceptable charging efficiency without requiring excessive power input.
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
Enables efficient charging by ensuring power is only supplied when a device is present and fully charged, reducing energy waste and preventing potential fires from under-charged or faulty devices.
Implementation Method 1
the wireless charger has a coil, wherein AC electromagnetic field is generated by the AC via the coil
Implementation Method 2
There is another coil in the electric receiver device for receiving the AC electromagnetic field, and converted into electrical energy for charging its battery
Implementation Method 3
wireless charging is so-called as an inductive charging, non-contact induction charging which is completed by near-field sensing for inductively coupling
Data Source
AI summary
A wireless charging system with auto-detection with an inductive loop for detecting an induced electric field resulted from the approach of an electrical receiver device to determine whether the electrical receiver device is close enough and thus adjust the output to the inductive loop from the power loop.