Inductive Power Signal Analysis Using Peak Tracking
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Solution Overview
Problem
The existing signal modulation methods in induction type power supply systems face challenges in effectively separating modulation signals from carrier signals due to limitations in frequency ratio and modulation degree, leading to restricted data transmission speed and poor dynamic range, especially at higher power outputs.
Innovation Solution
A signal analysis method and circuit that utilizes a voltage measurement circuit, operational amplifier, and comparator modules to track peak signals and configure high and low voltage levels, allowing for accurate determination of modulation signal reception within a few coil driving cycles, independent of carrier frequency stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If envelope detector and low-pass filter are used to separate modulation signal from carrier signal, then signal demodulation can be achieved, but data transmission speed is limited due to the requirement of high frequency ratio between carrier and modulation signal
Solution Approach 1:
The patent extracts only the peak information from the carrier signal using a peak detector circuit, rather than attempting to separate the entire modulation signal from the carrier. This extraction approach allows direct sampling of modulation information at the carrier frequency, eliminating the need for low-frequency modulation and enabling high-speed data transmission.
Solution Approach 2:
The patent replaces the traditional envelope detector and low-pass filter system with a peak detector circuit combined with digital signal processing. This substitution eliminates the mechanical filtering process that limited transmission speed and replaces it with electronic peak detection and digital threshold comparison, significantly increasing data transmission capability.
2Object-affected harmful factors
If carrier frequency is kept low to meet electromagnetic interference regulations, then EMI compliance is achieved, but the frequency ratio between carrier and modulation signal becomes insufficient for effective signal separation
Solution Approach 1:
Instead of modulating the carrier signal at a low frequency and then separating it, the patent inverts the approach by detecting peaks at the high carrier frequency and extracting modulation information from these peaks. This inversion allows the system to operate at high carrier frequencies for EMI compliance while still achieving accurate modulation signal recovery.
Solution Approach 2:
The patent changes the detection parameter from envelope amplitude (traditional AM detection) to peak timing and magnitude. By monitoring when and how strongly the carrier reaches its peak, the system can extract modulation information directly at the carrier frequency, bypassing the need for low-frequency modulation and maintaining signal separation accuracy.
3Reliability
If modulation degree is increased to improve signal detection reliability, then detection reliability improves, but the dynamic range of the envelope detector deteriorates at higher power outputs
Solution Approach 1:
The patent performs preliminary detection of the carrier signal peaks before attempting to extract modulation information. By first identifying the peak moments and levels of the carrier, the system establishes a reference framework that enables reliable modulation detection across varying power conditions, maintaining both detection reliability and dynamic range adaptability.
4Measurement precision
If traditional envelope detection method is used, then signal demodulation can be performed, but the analysis cycle duration is long and cannot adapt to rapidly changing power output conditions
Solution Approach 1:
The patent skips the traditional multi-step process of envelope detection, low-pass filtering, and gradual signal reconstruction. Instead, it rushes directly to the essential information by detecting carrier peaks and comparing them against threshold levels, achieving rapid modulation signal determination in a single analysis cycle that can keep pace with dynamic power output changes.
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 significantly increases data transmission speed and improves signal analysis performance by enabling modulation signal detection in a shorter cycle duration, overcoming the limitations of prior art methods.
Implementation Method 1
each of the power supplying terminal and the power receiving terminal includes a coil for performing induction
Implementation Method 2
the power receiving terminal varies the electrical characteristics of the receiving-end coil using signal modulation technology, where the variations of the electrical characteristics are reflected to the power supplying terminal to generate signal variations on the supplying-end coil
Data Source
AI summary
A signal analysis method for determining whether a supplying-end module of an induction type power supply system receives a modulation signal from a receiving-end module of the induction type power supply system includes obtaining a coil signal on a supplying-end coil of the supplying-end module; retrieving parts of the coil signal higher than a reference voltage to generate a peak signal; tracking the peak signal to obtain a peak voltage level; configuring a high voltage level higher than the peak voltage level and a low voltage level lower than the peak voltage level; and determining whether a plurality of peak values of the peak signal reach the high voltage level and determining whether the plurality of peak values of the peak signal reach the low voltage level during a determination cycle, and determining whether the supplying-end module receives the modulation signal accordingly.