Wireless Power Charging Relay Dynamic Calibration
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Solution Overview
Problem
Commercially available wireless power charging systems are limited to a maximum charging distance of 10 millimeters and require invasive installation methods, which are costly and damaging to furniture, and they are not suitable for charging devices requiring more than 15 watts.
Innovation Solution
A dynamic calibration method for wireless power charging systems that uses a relay and a transmitter with coils and controllers to determine operating parameters such as frequency, duty cycle, and amplitude based on dynamic measurements and calculations, allowing for effective charging through mediums like wood or granite tables, enabling longer charging distances and efficient power transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If wireless power charging systems are deployed in public facilities with accessible surfaces, then decorative appearance and hazard-free installation are achieved, but charging distance is limited to approximately 10 millimeters
Solution Approach 1:
The patent introduces a relay as an intermediary device between the transmitter and receiver coils. The relay is positioned closer to the receiver and coupled to the transmitter through a medium (table surface), enabling power transfer over distances exceeding 10mm while maintaining efficient coupling. This intermediary approach resolves the contradiction by extending charging distance without sacrificing power transfer efficiency.
2Ease of operation
If transmitter is installed inside cutout hole in surface to achieve longer charging distance, then charging distance is improved, but installation complexity and cost increase
Solution Approach 1:
The relay acts as a mediator that enables the transmitter to remain on the surface while achieving extended charging distance. Instead of installing the transmitter inside a cutout hole, the relay is positioned on the surface and couples the transmitter's magnetic field to the receiver, simplifying installation while maintaining long charging distance capability.
3Ease of manufacture
If relay is coupled to transmitter through medium like wood or granite, then non-invasive installation is achieved, but power transfer efficiency decreases
Solution Approach 1:
The system performs dynamic calibration by sweeping through a range of frequencies and measuring output AC current to identify the optimal operating frequency that maximizes power transfer efficiency. This dynamic adjustment compensates for the energy loss introduced by the medium, allowing efficient power transfer through non-invasive installations over wood, granite, or other surfaces.
4Measurement precision
If dynamic calibration with frequency sweeping is performed, then optimal operating parameters are determined, but calibration time increases
Solution Approach 1:
The system performs calibration during manufacturing or initial setup, determining the optimal operating frequency and parameters in advance. This preliminary calibration stores the optimized parameters for use during normal operation, eliminating the need for time-consuming calibration during each charging session while maintaining high measurement precision.
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
The method enables wireless power charging over greater distances and through various materials, providing efficient and non-invasive installation options while supporting higher power requirements for devices like tablets and smartphones.
Implementation Method 1
a relay, having a coil, adapted to inductively transfer power for charging a device and a transmitter, having a coil and a controller configured to inductively transmit to the relay the power for charging the device
Implementation Method 2
a relay, having a coil, adapted to inductively transfer power for charging a device
Data Source
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AI summary
According to a first aspect of the present disclosed subject matter, a dynamic calibration method in a system comprising a relay, having a coil, adapted to inductively transfer power for charging a device and a transmitter, having a coil and a controller configured to inductively transmit to the relay the power for charging the device, wherein the transmitter and the relay are separated by a medium, the method comprising: determining operating parameters selected from a group consisting of minimal and maximal operating frequency; direction of power increase relative to operating frequency; minimal and maximal duty cycle; minimal and maximal operating amplitude; and any combination thereof; wherein the operating parameters and a ping frequency are determined based on dynamic measurements of the transmitter operation and calculations executed by the controller during the calibration.