Wireless Power Demodulator Phase Delay Circuit for Reliable Data Recovery
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Solution Overview
Problem
Existing wireless power transmission systems face challenges in reliably detecting data or commands from the receiver to the transmitter due to low-level signals being masked by noise, especially when the assumption of amplitude modulation is invalid, leading to inefficient communication.
Innovation Solution
A primary side wireless power transmitter with a phase delay circuit, sample and hold circuit, and comparator is used to extract data or commands from the signal stream by generating a fixed phase delay clock signal, sampling the tank circuit voltage, and utilizing a threshold voltage signal to recover data from the signal stream.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If amplitude modulation detection is used to recover data from the receiver signal, then the communication channel can be established under the WPC standard assumption, but the data recovery fails when the assumption of amplitude modulation is invalid due to noise masking low-level signals
Solution Approach 1:
The patent changes the detection parameter from amplitude to phase by implementing a phase delay circuit that generates a phase-shifted version of the tank circuit signal. The comparator then detects phase differences rather than amplitude variations, allowing reliable data recovery regardless of whether the receiver uses amplitude or phase modulation. This parameter transformation resolves the contradiction by making the detection method adaptable to different modulation types.
2Device complexity
If the tank circuit voltage is directly fed to the comparator for data extraction, then the circuit is simple, but the low-level data signals are masked by noise and cannot be reliably detected
Solution Approach 1:
The patent introduces a phase delay circuit as an intermediary between the tank circuit and the comparator. This intermediary generates a phase-shifted reference signal that, when compared with the original tank circuit signal, amplifies the detectable phase differences caused by receiver modulation. This intermediary component enables precise detection of low-level data signals without significantly increasing overall circuit complexity.
3Reliability
If a phase delay circuit and sample and hold circuit are added to extract phase information, then data recovery reliability improves under varying parameters, but the device complexity increases
Solution Approach 1:
The patent merges the phase delay function and sample-and-hold function into a unified demodulator architecture where the phase-delayed signal is directly compared with the original signal in the comparator. This integration reduces the need for separate complex circuits for each function, achieving reliable phase-based data recovery while minimizing the increase in device complexity through functional consolidation.
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 solution effectively recovers data or commands from the receiver to the transmitter, even under varying system parameters and noise conditions, by maximizing signal amplitude and utilizing phase modulation detection, thereby establishing a reliable communication channel.
Implementation Method 1
a primary side wireless power transmitter inductively coupled to a secondary side wireless power receiver for supplying power to the wireless power receiver
Implementation Method 2
A phase delay circuit generates a fixed phase delay clock signal
Data Source
AI summary
A primary side wireless power transmitter inductively couplable to a secondary side wireless power receiver for supplying power to the wireless power receiver for receiving communications from the secondary side wireless power receiver through the inductive coupling comprises a primary side tank circuit receiving a signal on from the secondary side wireless power receiver. A phase delay or time delay circuit generates a fixed delay clock signal. A sample and hold circuit samples a tank circuit voltage utilizing the fixed phase or time delayed clock signal. A comparator is coupled to an output of the sample and hold circuit for extracting data or commands from the signal stream. A method of operating a primary side wireless transmitter inductively coupled to a secondary side wireless power receiver for supplying power to the wireless power receiver to power a load coupled to the receiver is also disclosed.