Laminar Coil Array Layout for Uniform Multi-Device Wireless Charging
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Solution Overview
Problem
Existing wireless charging systems struggle to efficiently and consistently charge multiple devices with varying form factors and locations on a charging surface, leading to inefficiencies and sub-optimal power transfer.
Innovation Solution
A wireless charging device with multiple laminar inductive coils arranged in layers, using Litz wires and calibrated to maintain uniform inductance, along with a matrix switching system to selectively activate coils for optimal power transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple devices are charged concurrently on a charging surface, then charging capacity and versatility are improved, but power transfer efficiency and consistency deteriorate due to varying device locations and form factors
Solution Approach 1:
The charging surface is divided into multiple independently controllable coil segments arranged in a grid pattern. Each coil can be selectively activated based on device position, allowing the system to serve multiple devices concurrently while optimizing power distribution to maintain efficiency despite varying locations and form factors.
2Reliability
If laminar inductive coils are calibrated to maintain uniform inductance, then power transfer consistency is improved, but device complexity and manufacturing precision requirements increase
Solution Approach 1:
The patent applies parameter changes by adjusting the number of turns in each laminar inductive coil to achieve uniform inductance values across all coils. This calibration process modifies the physical parameters of the coils during manufacturing to ensure consistent power transfer characteristics, thereby improving reliability while managing the complexity through a systematic adjustment approach.
3Power
If higher power demands are supported for multiple device charging, then charging capability is improved, but energy loss and heat generation increase
Solution Approach 1:
The system dynamically adjusts power distribution by selectively activating specific coils based on real-time device detection and positioning. This dynamic control allows the system to support higher overall power demands for multiple devices while optimizing energy utilization in each active zone, thereby reducing unnecessary energy loss and heat generation from inactive or underutilized coils.
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
Enhances efficiency and consistency of power transfer by optimizing coil placement and activation, supporting higher power demands and multiple device charging without location constraints.
Implementation Method 1
a plurality of planar power transmitting coils arranged in two or more layers between a charging surface and a ferrite layer... configured to transfer power wirelessly to a chargeable device
Data Source
AI summary
Systems, methods and apparatus for wireless charging are disclosed. A wireless charging device has a plurality of planar power transmitting coils arranged in two or more layers between a charging surface and a ferrite layer, and a driver circuit configured to provide a charging current to one or more of the plurality of planar power transmitting coils when a chargeable device is placed on or near the wireless charging device. Each planar power transmitting coil may be formed as a spiral winding surrounding a power transfer area. Inductance of each of the plurality of planar power transmitting coils measured at the charging surface varies from a nominal inductance value by less than ten percent.