Wireless Power Receiver Load Modulation for Stable Data Transfer
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Solution Overview
Problem
Existing wireless power transfer systems face challenges such as electromagnetic interference, noise, acoustic noise, and reduced reliability due to load modulation, which affect power transfer performance and compatibility with existing devices.
Innovation Solution
A power receiver design that incorporates a variable load to modulate the power transfer signal during communication intervals, interspersed with non-communication intervals, using a controlled modulation loading pattern to minimize interference and voltage variations, ensuring consistent operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If load modulation is used for communication during power transfer, then bidirectional communication capability is improved, but electromagnetic interference and noise increase
Solution Approach 1:
The patent implements periodic communication intervals interspersed with non-communication intervals during power transfer. The load modulation is applied only during designated communication time intervals, creating a periodic pattern that allows power transfer to continue while enabling bidirectional communication at scheduled moments, thereby reducing continuous electromagnetic interference while maintaining communication capability
Solution Approach 2:
The patent uses brief, intermittent load modulation pulses during communication intervals rather than continuous modulation. By rushing through the necessary data exchange in concentrated time periods and then skipping back to pure power transfer mode, the system achieves bidirectional communication while minimizing the duration and impact of electromagnetic interference and noise
2Reliability
If load modulation is applied continuously, then communication reliability is improved, but power transfer stability deteriorates due to voltage variations
Solution Approach 1:
The patent alternates between communication intervals with load modulation and non-communication intervals without modulation. This periodic switching allows the power transfer to stabilize during non-communication intervals while maintaining communication reliability through scheduled load modulation during communication intervals, preventing continuous voltage variations
Solution Approach 2:
The patent schedules communication intervals at predetermined moments during the power transfer process. By planning communication in advance at specific intervals rather than responding continuously to communication needs, the system can prepare for and manage the transition between power transfer and communication modes, reducing abrupt voltage variations and improving overall stability
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 reduces electromagnetic interference, acoustic noise, and improves communication reliability while maintaining power transfer stability and compatibility with existing systems.
Implementation Method 1
an input circuit comprising a receiver coil arranged to extract power from the power transfer signal
Implementation Method 2
a variable load coupled to the input circuit and arranged to apply a modulation loading to the input circuit
Data Source
AI summary
A power receiver (105) comprises an input circuit (107, 503) with a receiver coil (107) extracting power from a power transfer signal generated by a power transmitter (101). A variable load (511) applies a modulation loading to the input circuit (107, 503) and a data transmitter (509) transmit data symbols to the power transmitter (101) by load modulating the power transfer signal during communication time intervals interspersed by non-communication time intervals during which no data symbols are transmitted. The data symbols are represented by modulation loading patterns and the data transmitter (509) is arranged to control the variable load (511) to repeatedly change the modulation loading during non-communication time intervals. The approach may provide improved communication and power transfer operation, and may in particular reduce transients, e.g. in the supply voltage provided to a load of the power receiver (105).