Multi-Coil Wireless Charging Ping Selection for Fast Coil Matching
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Solution Overview
Problem
Conventional wireless charging systems face challenges in quickly determining the optimal combination of coils for charging complex and varying mobile devices, leading to inefficiencies in charging processes.
Innovation Solution
The implementation of differential capacitive sensing and passive pinging techniques allows for rapid detection and location of devices on a charging surface without the need for traditional power-consuming 'pings', enabling selective activation of coils for efficient charging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional power-consuming pings are used to detect device presence and determine optimal coil combinations, then device location detection can be achieved, but power consumption increases and charging speed decreases
Solution Approach 1:
The patent replaces the traditional electromagnetic ping-based detection system with a capacitive sensing system. The capacitive sensors detect device presence and location through changes in capacitance values, eliminating the need for power-consuming electromagnetic pings. This substitution maintains detection accuracy while dramatically reducing power consumption during the detection phase.
Solution Approach 2:
The system performs capacitive sensing and device location identification before initiating the charging process. By determining the optimal coil combination in advance using low-power capacitive detection, the system avoids consuming excessive power during the charging setup phase and enables faster transition to active charging.
2Measurement precision
If traditional ping methods are used to determine optimal coil combinations, then device detection can be achieved, but charging speed decreases due to prolonged detection time
Solution Approach 1:
The patent replaces the time-consuming electromagnetic ping sequence with immediate capacitive sensing. Capacitive sensors continuously monitor the charging surface for device presence, enabling rapid detection without the iterative ping-response delays inherent in traditional methods. This reduces detection time while maintaining accurate device location identification.
Solution Approach 2:
The capacitive sensing system operates continuously or in rapid succession to detect device presence and determine optimal coil combinations. This continuous monitoring approach eliminates the sequential ping-based detection process, reducing overall detection time and enabling faster transition to charging mode.
3Adaptability or versatility
If multiple coils are activated simultaneously for complex device configurations, then charging capability is improved, but power consumption and system complexity increase
Solution Approach 1:
The patent divides the charging surface into multiple independently controllable coil segments. Each coil can be individually activated or deactivated based on device detection results. This segmentation enables flexible configuration for single or multiple devices while simplifying the control logic, as each coil's activation state can be independently determined based on local capacitive sensing data.
Solution Approach 2:
The system dynamically adjusts which coils are activated based on real-time capacitive sensing data and detected device configurations. Rather than activating all coils simultaneously, the system adaptively selects and activates only the necessary coils for the current charging scenario, reducing system complexity and power consumption while maintaining versatility for various device configurations.
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 enhances charging efficiency by quickly identifying device location and selecting the optimal coil combination, supporting the charging of multiple devices simultaneously with improved power transfer ratios.
Implementation Method 1
The transmitter coil has an inductance (L) and a resonant capacitor that has a capacitance (C) that is coupled to the transmitting coil to obtain a resonant LC circuit
Implementation Method 2
A Ping is produced by delivering power to the resonant LC circuit
Data Source
AI summary
Systems, methods and apparatus for wireless charging are disclosed. A charging device has a plurality of charging cells provided on a charging surface, a charging circuit and a controller. The controller may be configured to cause the charging circuit to send pings from a plurality of charging coils using an analog ping process to scan for one or more ping responses from a receiving device in proximity to the charging surface. A subset of charging coils of the plurality of charging coils that received ping responses from the receiving device in response to the sending of pings with the analog process may be determined. Subsequently, the controller then sends pings from the subset of charging coils using a digital ping process. A combination of one or more charging coils of the subset of charging coils may then be selected based on ping responses from the receiving device.