Wireless Charging Coil Selection Using Inferred Coupling Estimation
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Solution Overview
Problem
Current wireless charging systems face challenges in efficiently detecting and adapting to the location and movement of devices on charging surfaces, particularly for complex and dynamically changing form factors, leading to inefficiencies in power consumption and charging performance.
Innovation Solution
The implementation of a low-power passive ping technique using a resonant LC circuit with a short excitation pulse to detect the presence and type of objects, combined with dynamic inferred coupling estimation to optimize charging configurations and handle device movement, reduces power consumption and enhances charging efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Difficulty of detecting and measuring
If digital ping transmissions are used to detect device presence and type, then device detection capability is improved, but power consumption increases
Solution Approach 1:
The patent implements periodic passive ping transmissions at optimized intervals rather than continuous or frequent digital pings. The system transmits low-power passive pings only when necessary to detect device presence or confirm device type, reducing unnecessary transmissions while maintaining reliable detection capability.
Solution Approach 2:
The patent replaces high-power digital ping transmissions with low-power passive ping techniques. By using passive electromagnetic field detection instead of active digital communication, the system achieves device detection with significantly reduced power consumption.
2Device complexity
If wireless charging systems use basic detection techniques, then system simplicity is maintained, but detection speed and power efficiency deteriorate
Solution Approach 1:
The patent performs preliminary device detection using passive pings before initiating full wireless charging operations. By detecting device presence and type in advance with low-power passive pings, the system prepares optimal charging parameters beforehand, enabling faster charging initiation without requiring complex real-time detection during power transfer.
3Device complexity
If wireless charging systems use basic detection techniques, then system simplicity is maintained, but power consumption during detection increases
Solution Approach 1:
The patent substitutes high-power digital ping detection with low-power passive electromagnetic field detection. This replacement maintains system simplicity while reducing detection power consumption by utilizing passive field interactions rather than active digital communication protocols.
4Device complexity
If charging configurations are not dynamically adjusted, then system complexity is reduced, but charging efficiency deteriorates during device movement
Solution Approach 1:
The patent implements feedback mechanisms that monitor coupling conditions during wireless charging. When device movement is detected through changes in coupling parameters, the system dynamically adjusts charging configurations by repositioning or reconfiguring transmitting coils to maintain optimal power transfer efficiency.
Solution Approach 2:
The patent enables dynamic reconfiguration of charging parameters and coil arrangements in response to real-time coupling conditions. By making the charging system adaptable to device position changes, the system maintains high charging efficiency without requiring overly complex prediction or pre-positioning mechanisms.
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 approach significantly reduces power consumption and improves charging efficiency by minimizing unnecessary digital ping transmissions and dynamically adjusting charging configurations to maintain optimal power transfer, even during device movement.
Implementation Method 1
a low-power passive ping technique using a resonant LC circuit with a short excitation pulse to detect the presence and type of objects
Implementation Method 2
wireless charging of batteries
Data Source
AI summary
Systems, methods and apparatus for providing a wireless charging device are disclosed. A method for operating the wireless charging device includes transmitting a first pulse through each of a plurality of charging circuits, determining peak voltage at nodes in the plurality of charging circuits, each node coupling a transmitting coil to a capacitor in one charging circuit in the plurality of charging circuits, the peak voltage at each node being responsive to the first pulse and indicative of a coupling coefficient with a receiving coil in a chargeable device, determining that a minimum peak voltage responsive to the first pulse is associated with a first charging circuit in the plurality of charging circuits, and providing a first charging current to the first charging circuit.