Wireless Power Coil Impulse Sensing for Misalignment Loss Control
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Solution Overview
Problem
Wireless charging systems face inefficiencies due to misalignment between transmitting and receiving coils, leading to unpredictable power transfer rates and potential safety issues from foreign objects, as existing systems lack effective methods to accurately determine device position and adjust power transfer accordingly.
Innovation Solution
Incorporating impulse response measurement circuitry to determine the inductance and quality factor of the transmitting coil, allowing for estimation of the receiving device's position and expected power loss, which is compared to actual power loss to adjust the power transfer rate or cease transmission if thresholds are exceeded.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If wireless power transmission is performed without position determination, then power transfer can begin immediately, but power transfer efficiency decreases due to coil misalignment
Solution Approach 1:
The system performs impulse response measurements and determines coil position before initiating full power transfer. This preliminary positioning action ensures optimal coil alignment is achieved beforehand, maximizing power transfer efficiency from the start of the charging process.
Solution Approach 2:
The system continuously monitors impulse response characteristics during power transmission and uses this feedback to determine real-time coil position and alignment. This feedback mechanism allows dynamic adjustment to maintain optimal efficiency throughout the charging process.
2Speed
If power transfer rate is increased without position verification, then charging speed improves, but safety risks increase from foreign objects
Solution Approach 1:
The system performs impulse response measurements and analyzes coil position and quality factor before initiating high-rate power transfer. This preliminary verification ensures the charging path is clear of foreign objects and coils are properly aligned, eliminating safety risks before high-power transmission begins.
Solution Approach 2:
The system continuously monitors impulse response characteristics during power transmission and compares actual power loss against expected power loss. This real-time feedback detects foreign objects or misalignment conditions, allowing the system to reduce or cease power transfer to prevent safety hazards while maintaining high charging speeds when conditions are safe.
3Measurement precision
If impulse response measurement circuitry is added, then position determination accuracy improves, but device complexity increases
Solution Approach 1:
The impulse response measurement circuitry serves multiple functions: determining coil position, assessing alignment quality, detecting foreign objects, and monitoring power transfer efficiency. This multi-functionality justifies the added circuitry complexity by providing comprehensive system diagnostics and control through a single measurement mechanism.
Solution Approach 2:
The measurement circuitry uses the existing power transmission coil and circuitry to perform self-diagnosis and position determination. The system measures its own impulse response characteristics without requiring separate external measurement equipment, reducing overall system complexity while maintaining high measurement precision.
4Productivity
If power transfer rate is dynamically adjusted, then power transfer efficiency optimizes, but control complexity increases
Solution Approach 1:
The system measures impulse response characteristics continuously during power transmission and uses this feedback to dynamically adjust the power transfer rate. The controller compares actual measurements against expected values and automatically adjusts power delivery to optimize efficiency while maintaining safety, with the adjustment logic based on straightforward threshold comparisons.
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 solution enhances power transfer efficiency by optimizing coil alignment and detecting foreign objects, ensuring safe and adaptive power delivery based on real-time positional data and power loss analysis.
Implementation Method 1
a wireless power transmitting device transmits wireless power to a wireless power receiving device. The wireless power transmitting device uses a wireless power transmitting coil to transmit wireless power signals
Implementation Method 2
The coil of the wireless power receiving device receives alternating-current wireless power signals from the wireless power transmitting device
Data Source
AI summary
A wireless power system has a wireless power transmitting device and a wireless power receiving device. The wireless power transmitting device may include a coil and wireless power transmitting circuitry coupled to the coil. The wireless power transmitting circuitry may include impulse response measurement circuitry that measures the inductance of the power transmitting coil and the quality factor of the power transmitting coil. The measured inductance and quality factor may subsequently be used to determine a position of the wireless power receiving device relative to the wireless power transmitting device. The determined position of the wireless power receiving device relative to the wireless power transmitting device may be used to estimate an expected power loss associated with the power transmitting coil. The power transfer operations may be adjusted based on expected and actual power losses.