Internal Repeater Coil Demodulation for Uniform Wireless Power
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Solution Overview
Problem
Wireless power transmission systems face challenges in achieving uniform power transmission over large areas, especially when the receiver is in motion, due to variations in the strength of the emitted field, which limits the coupling points and efficiency.
Innovation Solution
The system employs a transmitter antenna with a source coil and an internal repeater coil, along with inter-turn capacitors and a demodulation circuit, to maintain field uniformity and resilience to parasitic capacitances, while reducing electromagnetic interference and computational resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If more turns, coils, and resonant bodies are used within an antenna to enhance uniformity ratio, then field uniformity is improved, but cost, bill of materials, and environmental concerns increase due to more conductive materials
Solution Approach 1:
The antenna is divided into a source coil and an internal repeater coil, where the repeater coil is positioned inside the source coil. This segmentation allows the system to achieve enhanced field uniformity through the combined effect of multiple coils while using fewer total turns compared to a single large coil design, thus reducing conductive material requirements.
Solution Approach 2:
The internal repeater coil is nested within the source coil structure. This nesting arrangement enables the repeater to contribute to field uniformity in the central region where receivers typically operate, allowing for reduced overall material usage while maintaining or improving uniformity performance.
2Area of stationary object
If wireless power transmission operates over a large charge area, then coverage is improved, but variations in field strength limit coupling points and reduce transmission efficiency
Solution Approach 1:
The transmission system is segmented into a source coil and an internal repeater coil, with each coil contributing to field generation in different spatial regions. The repeater coil specifically enhances field uniformity in the central charge area, enabling large-area coverage while maintaining stable field strength characteristics across the charging surface.
3Loss of information
If conventional demodulation methods are used for wireless data transfer, then data communication is achieved, but computational resources and processing complexity increase
Solution Approach 1:
The system replaces complex computational demodulation methods with a simpler analog envelope detection circuit. This circuit uses basic electronic components (diodes, capacitors, resistors) to extract data from the power transmission signal, eliminating the need for sophisticated digital signal processing and reducing computational resource requirements while maintaining data transfer accuracy.
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 configuration enhances the uniformity ratio of power transmission, maintains performance in the presence of metal objects, and reduces costs and environmental concerns by minimizing conductive materials, while ensuring efficient data decoding and transmission accuracy.
Implementation Method 1
inductive and/or resonant inductive wireless power transfer, which occurs when magnetic fields created by a transmitting element induce an electric field and, hence, an electric current, in a receiving element
Implementation Method 2
when magnetic fields created by a transmitting element induce an electric field and, hence, an electric current, in a receiving element
Implementation Method 3
resonant inductive wireless power transfer
Data Source
AI summary
A wireless transmission system includes a transmitter antenna configured to transmit AC wireless signals to the at least one antenna, the AC wireless signals including wireless power signals and wireless data signals, the transmitter antenna including a source coil and an internal repeater coil. The system further includes at least one sensor configured to detect electrical information associated with the electrical characteristics of the AC wireless signals at one of the source coil or the internal repeater coil. A demodulation circuit is configured to receive the electrical information from the at least one sensor at the internal repeater coil, detect a change in the electrical information, (iii) determine if the change in the electrical information meets or exceeds one of a rise threshold or a fall threshold, if the change exceeds one of the rise threshold or the fall threshold, generate an alert, and output a plurality of data alerts.