FSK Signal Demodulation for Wireless Power Transfer
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Solution Overview
Problem
Existing mobile and portable devices require inconvenient wired connections or dedicated power supply devices for charging, which can be impractical and increase device weight and cost due to internal batteries, and there is a need for a more efficient power transmission method.
Innovation Solution
A system and method for demodulating a frequency shift keying signal using a power transmitter and receiver with inductive coupling, where the power transmitter generates a frequency shift keying signal including a power signal and modulation instruction message, and the receiver detects non-modulation periods and calculates full periods to generate an undemodulated signal, enabling wireless power transmission without physical electrical connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If wireless power transmission using electromagnetic coupling is used, then convenience and user experience are improved by eliminating wired connections, but power transmission efficiency and reliability deteriorate due to loose coupling between transmitter and receiver coils
Solution Approach 1:
The patent implements a feedback mechanism where the receiver detects the transmitted FSK signal, demodulates it to extract power control information, and sends feedback signals to the transmitter. The transmitter adjusts its output power based on this feedback, creating a closed-loop control system that maintains reliable power transmission despite variable coupling conditions between coils.
Solution Approach 2:
The patent uses frequency modulation to encode power control information in the FSK signal. By changing the frequency parameter of the power signal based on the modulated information, the system can dynamically adjust transmission parameters to maintain reliability while preserving wireless convenience.
2Ease of operation
If internal secondary batteries are provided in mobile devices, then devices can operate without external power connections, but device weight, size, and cost increase significantly
Solution Approach 1:
The patent replaces the mechanical/chemical energy storage system (internal batteries) with an electromagnetic energy transfer system. Instead of storing energy chemically in batteries, the device receives energy wirelessly through electromagnetic coupling, substituting the battery-based power supply mechanism with an inductive power reception mechanism.
3Reliability
If wired connections are used for power transmission, then power can be transmitted efficiently and reliably, but user convenience deteriorates due to the need for physical connections and long wires
Solution Approach 1:
The patent uses electromagnetic fields as an intermediary to transfer power between the transmitter and receiver without direct physical contact. The magnetic field couples the transmitter coil and receiver coil, serving as a mediator that enables power transmission while maintaining user convenience by eliminating the need for physical plugging and unplugging of wires.
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 allows for efficient wireless power transmission between devices, improving user experience by eliminating the need for wired connections and dedicated power supply devices, while reducing device weight and cost, and enabling mass production efficiency by standardizing power transmission across different devices.
Implementation Method 1
The power transmitter inductor is connected to the power signal generator. The power transmitter inductor is configured to transmit the frequency shift keying signal from the power signal generator
Implementation Method 2
The power receiver inductor is coupled to the power transmitter inductor. The power receiver inductor is configured to receive the frequency shift keying signal
Data Source
AI summary
A system and a method for demodulating a frequency shift keying signal are provided. The system includes a power transmitter and a power receiver. The power transmitter generates a frequency shift keying signal including a power signal and a power modulation instruction message. The power receiver detects a non-modulation period of the power signal within a waiting time, and then modulates a frequency of the power signal according to the power modulation instruction message to generate a pulse width modulated signal. The power receiver then calculates a full period of the pulse width modulated signal and then subtracts the non-modulation period from the full period of the pulse width modulated signal to obtain an undemodulated signal.