Inductive Power Supply Data Determination via Current Signal Analysis
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Solution Overview
Problem
The existing induction type power supply systems face limitations in universality, flexibility, and accuracy in data determination due to specific frequency-based hardware, vulnerability to noise, and limitations in signal amplification, which affect the ability to effectively obtain modulation data from the receiving-end module.
Innovation Solution
A data determination method for the supplying-end module that generates a current signal based on modulated feedback from the receiving-end module, amplifies peak values, sets reference voltages, and compares these values to retrieve modulation data, allowing for adaptive signal processing and noise reduction without the need for frequency-specific filters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a low-pass filter circuit is used to filter carrier signals and retrieve low frequency signals, then data transmission can be achieved, but the hardware circuit can only be utilized for a specific frequency resulting in poor universality and flexibility
Solution Approach 1:
The patent replaces frequency-specific low-pass filter hardware with a software-based signal processing approach. The microcontroller can process signals at any frequency by adjusting software parameters, making the system universal and adaptable to different frequencies without requiring physical hardware changes.
Solution Approach 2:
The patent substitutes the mechanical/electrical low-pass filter circuit with a software-based filtering and demodulation algorithm implemented in the microcontroller. This replaces physical frequency-selective components with programmable signal processing that can adapt to any carrier frequency.
2Measurement precision
If fixed amplification ratio is used in the demodulation technology, then voltage and current signals can be amplified, but small signals cannot be successfully analyzed if amplification ratio is not large enough and noises may easily be mixed into the signals if amplification is too large
Solution Approach 1:
The patent implements dynamic amplification where the microcontroller adjusts the amplification ratio based on the detected signal strength. For weak signals, higher amplification is applied; for strong signals, lower amplification prevents noise amplification. This dynamic adjustment optimizes signal-to-noise ratio for varying signal conditions.
Solution Approach 2:
The system uses feedback from the detected signal amplitude to control the amplification level. The microcontroller monitors the incoming signal strength and adjusts the amplification factor accordingly, creating a closed-loop system that adapts to signal conditions to minimize noise interference while ensuring small signals are detectable.
3Measurement precision
If conventional demodulation scheme is used, then data can be retrieved, but the performance is poor in wireless transmission when transmitted power is large because voltage variations on the coil may decrease with increase in transmitted power resulting in lower signal determination capability
Solution Approach 1:
The patent replaces voltage-based demodulation with current-based demodulation using a current sensor. Current variations on the coil remain detectable even when transmitted power is large and voltage variations decrease, thereby maintaining signal determination capability across the full power range.
Solution Approach 2:
The patent changes the detection parameter from voltage to current. By measuring current variations instead of voltage variations, the system maintains sensitivity to modulation signals even when high transmitted power causes voltage variations to become too small to detect reliably.
4Adaptability or versatility
If frequency-specific hardware filter is used, then signal filtering can be achieved, but the hardware circuit will not be utilized if another communication protocol is applied or signal frequency changes resulting in poor flexibility
Solution Approach 1:
The patent designs a universal hardware platform with a current sensor and microcontroller that can support multiple communication protocols and frequencies through software configuration. The hardware remains the same while software parameters are adjusted to accommodate different protocols, achieving multi-functionality without hardware redesign.
Solution Approach 2:
The patent replaces protocol-specific hardware filtering with software-based signal processing in the microcontroller. This allows the same hardware circuit to be used across different protocols and frequencies by simply changing software parameters rather than physical filter characteristics.
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 method enhances the ability to accurately determine modulation data, improves flexibility, and maintains signal integrity across varying loads, enabling effective power supply performance and data decoding.
Implementation Method 1
the power supply device drives the supplying-end coil to generate resonance and sends electromagnetic power to the power receiving device
Implementation Method 2
the power receiving device may change the impedance on the receiving-end coil via the signal modulation technology, and the variations are fed back to vary the amplitude of carriers on the supplying-end coil
Data Source
AI summary
A data determination method for a supplying-end module of an induction type power supply system includes generating a current signal on a resonant coil of the supplying-end module according to a modulated signal of a receiving-end module of the induction type power supply system fed back from a resonant coil of the receiving-end module to the resonant coil of the supplying-end module; amplifying the current signal to retrieve a plurality of peak values of the current signal; setting a reference voltage according to magnitudes of the plurality of peak values; comparing the plurality of peak values with the reference voltage to generate a comparison result; and analyzing the comparison result to obtain modulation data of the receiving-end module of the induction type power supply system.