Wireless Power Receiver Beaconing for Reliable ASK Signal Detection
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Solution Overview
Problem
Existing wireless power transfer systems face inefficiencies in in-band data transfer due to varying relative positions and orientations of sender and receiver, leading to signal strength changes that can cause previously readable signals to become faint or saturated, requiring high sensitivity and dynamic adjustment of gain and bias to maintain effective data detection.
Innovation Solution
A wireless power transmission system with a demodulation circuit that includes a slope detection circuit and automatic bias and gain control, using a beaconing sequence to determine coupling and set resistance values for digital potentiometers, allowing for accurate detection of signal slope changes and decoding of ASK signals across varying coupling ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If in-band data transfer is used for wireless power transfer systems, then data communication capability is improved, but signal detection reliability deteriorates when relative positions of sender and receiver vary greatly
Solution Approach 1:
The patent implements dynamic gain and bias adjustment through automatic gain control (AGC) circuits and digital signal processing that continuously adapt to changing coupling conditions. The system dynamically modifies demodulation parameters based on real-time signal strength measurements to maintain reliable detection across varying relative positions of transmitter and receiver coils.
Solution Approach 2:
The system changes demodulation parameters including gain, bias, and filtering characteristics based on detected signal conditions. The patent employs variable gain amplifiers and adjustable bias circuits that modify their operating parameters in response to changing coupling coefficients, thereby maintaining optimal signal detection across different spatial configurations.
2Reliability
If additional antennas and circuitry are used for separate data communication, then data transfer reliability is improved, but device complexity and cost increase
Solution Approach 1:
The patent makes the wireless power transfer system multi-functional by enabling it to perform both power transfer and data communication through the same physical channel. The inductive coupling interface serves dual purposes: transferring electrical energy while simultaneously modulating and detecting data signals, thereby eliminating the need for separate communication hardware.
Solution Approach 2:
The system merges the power transfer function and data communication function into a single integrated system. By superimposing data modulation on the power transfer signal and using the same sensing circuits for both purposes, the patent reduces overall system complexity while maintaining reliable data transfer capabilities.
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
The system ensures reliable and efficient in-band data transfer by dynamically adjusting gain and bias, enabling detection of faint signals while avoiding saturation, even with changing coupling conditions, thus improving throughput and accuracy.
Implementation Method 1
a transmitter antenna configured to couple with at least one other antenna of at least one other system and transmit alternating current (AC) wireless signals to the at least one other antenna
Implementation Method 2
The demodulation circuit is configured to (i) receive the electrical information from the at least one sensor, (ii) apply automatic bias control and gain control to the electrical information to generate a modified electrical information signal (iii) detect a change in the modified electrical information signal
Data Source
AI summary
A wireless power transmission system includes a transmitter antenna, a sensor, a demodulation circuit, and a transmitter controller. The sensor is configured to detect electrical information indicative of data signals encoded in the transmission by a receiver. The demodulation circuit is configured to apply automatic bias control and gain control to the electrical information to generate a modified electrical information signal, detect a change in the modified electrical information signal, and generate alerts based on said change, indicative of the data signals. The transmitter controller is configured to perform a beaconing sequence to determine a coupling between the transmitter antenna and the at least one other antenna, determine the automatic bias control and the automatic gain control, for the demodulation circuit based on the beaconing sequence, receive the plurality of data alerts from the demodulation circuit, and decode the plurality of data alerts into the wireless data signals.