AGC Demodulation Circuit for Wireless Power ASK Position Shifts
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Solution Overview
Problem
Existing wireless power transfer systems face inefficiencies and increased costs due to the use of additional antennas and circuitry for in-band data communication, leading to interference, harmonic distortion, and increased Bill of Materials (BOM), while in-band data transfer becomes ineffective when sender and receiver positions vary significantly.
Innovation Solution
A demodulation circuit that includes a slope detector and high pass filter to accurately decode amplitude shift keying signals by detecting changes in electrical characteristics, reducing computational resources and BOM by allowing cheaper processors, and maintaining accurate data transmission despite varying positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If additional antennas and circuitry are used for in-band data communication, then data transmission capability is improved, but system complexity and Bill of Materials (BOM) increase
Solution Approach 1:
The patent makes the wireless power transfer system multi-functional by enabling it to perform both power transfer and data communication using the same antenna and circuitry. The in-band communication capability is integrated into the existing power transfer infrastructure, allowing a single system to serve dual purposes without requiring separate dedicated hardware for each function.
Solution Approach 2:
The patent merges the power transfer and data communication functions into a unified system. By combining these functions and using the same hardware resources for both purposes, the patent eliminates the need for additional separate antennas and circuitry, thereby reducing system complexity while maintaining data transmission capability.
2Adaptability or versatility
If additional antennas and circuitry are used for in-band data communication, then data transmission capability is improved, but interference and harmonic distortion increase
Solution Approach 1:
The patent extracts the data communication function from a separate communication system and integrates it into the power transfer system. By taking out the data communication capability and embedding it within the existing power transfer infrastructure, the patent eliminates the interference that would arise from having separate, additional antennas and circuitry operating in close proximity.
3Productivity
If in-band data transfer is used, then system efficiency is improved, but accuracy deteriorates when sender and receiver positions vary significantly
Solution Approach 1:
The patent employs feedback mechanisms to monitor and adjust the communication signal based on the actual coupling conditions between transmitter and receiver. By continuously monitoring the power transfer characteristics and adapting the data modulation and detection accordingly, the system maintains accurate data transmission even when positions vary, thus preserving measurement precision while keeping system efficiency high.
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 demodulation circuit efficiently decodes in-band data signals with reduced computational resources, minimizing BOM and maintaining accuracy across varying sender-receiver positions, thus enhancing system efficiency and reducing costs.
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
A demodulation circuit that includes a slope detector and high pass filter to accurately decode amplitude shift keying signals by detecting changes in electrical characteristics
Data Source
AI summary
A wireless transmission system includes a transmitter antenna, a sensor, a demodulation circuit, and a transmitter controller. The sensor is configured to detect electrical information associated with AC wireless signals, the electrical information including, at least, a voltage of the AC wireless signals. The demodulation circuit is configured to receive the electrical information from the at least one sensor, detect a change in the electrical information, 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. The transmitter controller is configured to receive the plurality of data alerts from the demodulation circuit and decode the plurality of data alerts into the wireless data signals.