Phase Modulation for Wireless Power Back Channel Data Rates
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Solution Overview
Problem
Conventional in-band data communications in wireless power systems are slow, limiting the data transfer rate and requiring additional components for faster communication, which increases costs and complexity.
Innovation Solution
Implementing phase-modulation in wireless power transmitters and receivers to encode and decode data within the wireless power signal, allowing for higher data rates with minimal disturbance to the power transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional in-band data communication is used in wireless power systems, then the system maintains simplicity, but the data transfer rate is slow
Solution Approach 1:
The patent applies parameter changes by modulating the phase of the wireless power signal to encode data. Instead of using conventional frequency shift keying or separate communication channels, the system varies the phase parameter of the power signal itself to carry information, achieving high data rates while maintaining system simplicity
Solution Approach 2:
The wireless power signal serves dual functions: transferring power and carrying data. By encoding data in the phase of the power signal, the same transmission medium performs both power delivery and communication tasks, eliminating the need for separate communication hardware and achieving high productivity without increased complexity
2Productivity
If phase modulation is implemented to increase data rate, then data transfer speed improves, but power transmission stability may be affected
Solution Approach 1:
The patent applies partial action by introducing phase modulation only during specific intervals of the power transmission cycle. The phase shifts are applied in a controlled manner that does not disrupt the overall power transfer, allowing high data rates while maintaining power transmission stability through selective modulation timing
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
Achieves data rates significantly higher than conventional frequency shift keying modulation, up to 25 to 50 kHz, while maintaining low power variation and simplicity by using phase-shift modulation over existing wireless power systems.
Implementation Method 1
a transmitter driving a transmit coil and a receiver with a receiver coil placed proximate to the transmit coil. The receiver coil receives the wireless power generated by the transmit coil
Implementation Method 2
data is modulated for transmission phase modulation. A modulator coupled to the driver to provide phase change modulation to the wireless power signal to transmit data
Implementation Method 3
a receiver with a receiver coil placed proximate to the transmit coil. The receiver coil receives the wireless power generated by the transmit coil
Implementation Method 4
a switching rectifier coupled to receive a wireless power signal from the receive coil
Data Source
AI summary
In accordance with embodiments of the present invention, data is modulated for transmission phase modulation. A method of transmitting data in a wireless power transmitter, includes transmitting a wireless power signal; encoding data to be transmitted into symbols; determining a phase shift to represent the symbols; and phase modulating the wireless power signal with the phase shift. A method of receiving data in a wireless power receiver includes receiving a wireless power signal that includes a phase modulated data signal; determining a period of each cycle of the wireless power signal; providing a running average over N−1 cycles of the wireless power signal, where N represents the number of cycles of the wireless power signal in which each phase modulation is provided; and decoding the data from the running average.