RF Charging Signal Amplitude Compensation for Wireless Power
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Solution Overview
Problem
Wireless charging systems face disruptions due to fluctuations in the supply voltage caused by in-band communications, particularly affecting decoding processes that rely on amplitude modulation techniques like amplitude-shift keying (ASK), leading to potential data loss and reduced communication reliability.
Innovation Solution
A system that includes a power transmitting coil, a signal generation circuit to create an RF charging signal, an amplification circuit to amplify the signal, and a communication circuit to detect and adjust amplitude variations in the RF signal, as well as decode data, while compensating for detected voltage level variations in the supply voltage to ensure accurate data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If in-band communication is implemented using amplitude modulation techniques, then data transmission capability is improved, but supply voltage fluctuations cause decoding errors and reduce communication reliability
Solution Approach 1:
The system implements a feedback mechanism where the communication circuit monitors the supply voltage level and feeds this information back to the signal generation circuit. This allows the system to dynamically adjust the RF charging signal characteristics based on actual power supply conditions, compensating for voltage fluctuations and maintaining reliable communication.
Solution Approach 2:
The signal generation circuit changes operational parameters (such as signal amplitude, frequency, or modulation depth) based on detected supply voltage levels. By dynamically adjusting these parameters, the system adapts to varying power conditions and maintains communication reliability despite voltage fluctuations.
2Device complexity
If wireless charging circuit is designed with conventional power supply, then cost and physical size are reduced, but power supply variations disrupt communication and reduce system stability
Solution Approach 1:
The system employs self-service mechanisms where the existing power supply circuit serves dual purposes: providing power for charging and providing the carrier signal for communication. The communication circuit extracts modulation signals from the RF charging signal itself, eliminating the need for separate stable reference voltage sources while maintaining system stability through intelligent signal processing.
3Use of energy by moving object
If supply voltage is used directly for signal amplification, then power efficiency is improved, but voltage variations are amplified and cause communication errors
Solution Approach 1:
The amplification circuit is designed to be dynamic rather than static, automatically adjusting its gain and operating point based on the instantaneous supply voltage level. This dynamic adaptation allows the circuit to maintain optimal amplification efficiency across varying voltage conditions while compensating for the inherent voltage variations to preserve signal detection accuracy.
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 solution effectively compensates for supply voltage variations, improving the reliability of in-band communication by ensuring accurate decoding of data, even in non-ideal power supply conditions, thereby enhancing the stability and efficiency of wireless charging systems.
Implementation Method 1
a power transmitting coil configured to present the amplified charging signal to the power transmitting coil for transmission of wireless power to a remote device
Implementation Method 2
An amplification circuit is configured to amplify the RF charging signal using the supply voltage
Data Source
AI summary
A power supply circuit can be configured to generate a supply voltage that provides power to the apparatus. A signal generation circuit can be configured to generate a radio frequency (RF) charging signal. An amplification circuit can be configured to amplify the RF charging signal using the supply voltage and to present the amplified charging signal to a power transmitting coil for transmission of wireless power to a remote device. A communication circuit can be configured to detect amplitude variations in the RF charging signal; detect variations in a voltage level of the supply voltage; adjust the detected amplitude variations in the RF charging signal to compensate for detected variations in a voltage level; and decode data represented by the amplitude variations in the RF charging signal based upon the adjusted amplitude variations.