Wireless Power Transfer Feedback for ASK Demodulation Failure
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Solution Overview
Problem
In wireless power transfer systems, demodulation quality issues with amplitude shift key (ASK) signals can lead to failed communication between transmitters and receivers, as the power transmitter often remains passive and does not notify the receiver of demodulation failures, resulting in continued transmission of low-quality signals.
Innovation Solution
The system configures the transmitter to generate a frequency shift key (FSK) signal to notify the receiver of failed demodulation, allowing the receiver to reconfigure settings such as modulation capacitors or rectifier voltage targets to improve ASK signal quality, and the transmitter can also add disturbances to amplify amplitude differences in the ASK signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the transmitter remains passive and does not notify the receiver of demodulation failures, then the system complexity is reduced, but the communication reliability deteriorates as low-quality signals continue to be transmitted
Solution Approach 1:
The transmitter actively monitors demodulation quality of ASK signals and sends FSK notifications to the receiver when demodulation failures are detected. This feedback loop enables the receiver to adjust its modulation parameters (such as capacitor values or rectifier voltage targets) to improve signal quality, thereby resolving the technical contradiction by maintaining communication reliability without significantly increasing system complexity.
2Duration of action of moving object
If the receiver continues transmitting ASK signals despite demodulation failures, then the power transfer continuity is maintained, but the communication efficiency deteriorates due to repeated failed demodulation attempts
Solution Approach 1:
The feedback mechanism enables rapid detection and correction of demodulation issues. When the transmitter detects a demodulation failure, it immediately notifies the receiver via FSK signal, which then adjusts its modulation parameters. This feedback-driven correction prevents repeated failed demodulation attempts, thereby improving communication efficiency while maintaining power transfer continuity through coordinated adjustments.
Solution Approach 2:
The system performs preliminary detection of demodulation quality and takes corrective action before continued failed transmissions occur. By monitoring demodulation success and proactively adjusting parameters upon detecting failures, the system prevents the accumulation of ineffective transmission attempts, thus maintaining both power transfer continuity and communication efficiency.
3Measurement precision
If the receiver adjusts modulation parameters to improve ASK signal quality, then the demodulation success rate is improved, but the device complexity increases due to additional reconfiguration capabilities
Solution Approach 1:
The receiver adjusts modulation parameters (such as capacitor values in the resonant circuit or rectifier voltage targets) based on feedback from the transmitter regarding demodulation quality. This feedback-driven parameter adjustment enables the receiver to optimize ASK signal quality and demodulation success rate while maintaining a relatively simple device architecture, as the adjustments are made based on external feedback rather than requiring complex autonomous optimization circuits.
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 enables the receiver to adjust and improve the quality of ASK signals, ensuring successful demodulation and maintaining efficient power transfer by addressing demodulation quality issues proactively.
Implementation Method 1
The transmission coil and the receiver coil can be brought close to one another to form a transformer that can facilitate inductive transmission of alternating current (AC) power
Implementation Method 2
The receiver can switch in or switch out different number of capacitors of the resonant circuit to generate amplitude shift key (ASK) signals and encode messages in the ASK signals
Implementation Method 3
The controller may be further configured to encode a notification of failure in a frequency shift key (FSK) signal
Data Source
AI summary
Systems and apparatuses for wireless power transfer system are described. A receiver may send an amplitude shift key (ASK) signal to a transmitter. The transmitter may receive the ASK signal from the receiver. The transmitter may perform a demodulation on the ASK signal. The transmitter may, in response to a failure to demodulate the ASK signal, encode a notification of failure in a frequency shift key (FSK) signal. The transmitter may transmit the FSK signal to the receiver. The receiver may receive the FSK signal. The receiver may perform a function to resolve the failure to demodulate the ASK signal.