Bidirectional Demodulation Circuit for Wireless Charging
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wireless charging systems, particularly those compliant with the Qi standard, face challenges in cost and size reduction, especially when implementing bidirectional communication using amplitude-shift keying (ASK) and frequency-shift keying (FSK) modulation, which often require numerous discrete components, leading to costly and complex implementations.
Innovation Solution
A method is introduced for a wireless charging system that uses a bi-phase digital encoding scheme, where a power transmitter and receiver process analog signals to generate digital samples, detect transitions using multiple filters, and decode binary data, implemented in a micro-controller unit (MCU) that can function in both transmitter and receiver modes, reducing the need for discrete components and enhancing demodulation accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional ASK and FSK demodulation circuits are used in wireless charging systems, then communication functionality is achieved, but device complexity and manufacturing cost increase due to numerous discrete components
Solution Approach 1:
The patent combines ASK and FSK demodulation circuits into a single integrated demodulation unit that can handle both modulation types. The circuit uses a unified architecture with shared components including an analog-to-digital converter, digital signal processor, and common signal processing blocks, thereby reducing the total number of discrete components while maintaining both communication modes.
Solution Approach 2:
The demodulation circuit is designed with universal functionality to process both ASK and FSK modulated signals through a single integrated structure. The circuit includes configurable signal processing paths and adjustable parameters that allow it to adapt to different modulation schemes, eliminating the need for separate dedicated circuits for each modulation type.
2Reliability
If conventional ASK and FSK demodulation circuits are used in wireless charging systems, then communication functionality is achieved, but manufacturing cost increases due to numerous discrete components
Solution Approach 1:
The patent combines ASK and FSK demodulation circuits into a single integrated demodulation unit that can handle both modulation types. The circuit uses a unified architecture with shared components including an analog-to-digital converter, digital signal processor, and common signal processing blocks, thereby reducing the total number of discrete components while maintaining both communication modes.
Solution Approach 2:
The demodulation circuit is designed with universal functionality to process both ASK and FSK modulated signals through a single integrated structure. The circuit includes configurable signal processing paths and adjustable parameters that allow it to adapt to different modulation schemes, eliminating the need for separate dedicated circuits for each modulation type.
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 simplifies the demodulation process, reduces component costs, and improves the reliability of bidirectional communication in wireless charging systems by leveraging a micro-controller unit to handle both ASK and FSK modulations, thereby enhancing the efficiency and cost-effectiveness of wireless charging systems.
Implementation Method 1
a primary coil in the power transmitter wirelessly transmits a power signal to a secondary coil in the power receiver
Data Source
AI summary
A system and method for demodulating a wireless power signal onto which binary data has been modulated involves processing the wireless power signal with analog circuitry to produce a modified power signal in accordance with the type of demodulation used, periodically capturing digital samples of the modified power signal to produce a series of digital samples, applying, with an MCU, at least two digital filtering algorithms to the digital samples to determine transitions associated with the modulation, and recovering, with the MCU, the binary data as a function of the determined transitions. The demodulator is applicable to bidirectional power transfer capable devices and includes algorithms that can be applied similarly to both ASK and FSK demodulations with little or no modification.