Wireless Power Link Data Detection via Phase Monitoring
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Solution Overview
Problem
Existing wireless power supply systems face challenges in reliably detecting data communications modulated onto power signals due to low signal-to-noise ratios, particularly in applications where parasitic metal and varying device orientations affect efficiency and performance.
Innovation Solution
The system employs a detector circuit that monitors input power to the switching circuit, utilizing a band-pass filter and comparator to isolate communication signals, and an alternative method that detects phase changes between current and voltage in the tank circuit, both feeding the filtered signals into a controller for binary data interpretation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If current sensor monitoring is used to detect data communications on the power signal, then data communication detection is achieved, but signal-to-noise ratio is low making it difficult to discriminate between data and noise
Solution Approach 1:
The patent introduces an intermediary detection mechanism that monitors the primary coil current indirectly through its effect on the resonant circuit rather than directly sensing the modulated power signal. This intermediary approach filters out noise while preserving data communication signals, resolving the contradiction between detection accuracy and signal-to-noise ratio
Solution Approach 2:
The patent replaces direct electrical signal sensing with a resonant circuit-based detection method that uses electromagnetic resonance principles. This substitution allows for better signal discrimination by exploiting the frequency-selective properties of resonant circuits, improving both measurement precision and reliability
2Reliability
If parasitic metal is present in range of the wireless power supply, then performance is affected or undesirable issues arise, but adaptive control system can respond by adjusting operating parameters or shutting down
Solution Approach 1:
The patent implements a feedback mechanism that continuously monitors the resonant circuit parameters and detects changes caused by parasitic metal. When foreign objects are detected, the system adjusts operating parameters or shuts down the power supply, resolving the contradiction between maintaining performance stability and dealing with harmful external factors
Solution Approach 2:
The patent employs dynamic adjustment of operating parameters based on real-time detection of parasitic metal presence. The system can adaptively change frequency, power level, or terminate operation, providing flexibility to maintain reliability while responding to harmful environmental factors
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 enhances signal-to-noise ratio and robustness, allowing for simpler and more effective detection of data communications, reducing the likelihood of missing communications due to load changes and improving overall system reliability.
Implementation Method 1
A typical inductive power transfer system includes an inductive power supply that uses a primary coil to wirelessly transfer energy in the form of a varying electromagnetic field and a remote device that uses a secondary coil to convert the energy in the electromagnetic field into electrical power
Implementation Method 2
The wireless power supply includes a detector with a detector for generating a signal indicative of the current in the input power supplied to the switching circuit
Implementation Method 3
The detector circuit may also include a band-pass filter for filtering the detector output to strip out variations in the signal outside the range of the communication signal
Implementation Method 4
The detector circuit may also include a comparator for converting the filtered signal into high and low signals corresponding to the communications in the power signal
Data Source
AI summary
A wireless power supply system that detects communications in the input power to the switching circuit. In this aspect of the invention, the wireless power supply includes a detector for generating a signal indicative of the current in the input to the switching circuitry, a band-pass filter for filtering the detected signal, an amplifier for amplifying the filtered signal, a filter for filtering the amplified signal and a comparator for converting the final signal into a stream of high and low signals that can be passed to a controller for processing as binary data stream. In a second aspect, the wireless power supply system includes a detector for generating a signal that varies in dependence on changes in the phase relationship between the current and the voltage in the primary-side tank circuit, a band-pass filter for filtering the signal, an amplifier for amplifying the filtered signal, a filter for filtering the amplified signal and a comparator for converting the final signal into a stream of high and low signals that can be passed to a controller for processing as binary data stream.