Wireless Power Transfer Load Modulation With Adaptive Communication Modes
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Solution Overview
Problem
Existing wireless power transfer systems face challenges such as electromagnetic interference, acoustic noise, and compatibility issues due to load modulation, particularly in high power applications, and require improved communication methods for efficient interworking between devices with different capabilities.
Innovation Solution
A power receiver and transmitter system that employs load modulation using chip sequences to transmit data symbols, allowing adaptive communication modes based on detected signal variations, reducing modulation depth and complexity, and enabling reliable communication without additional transmitter-receiver communication channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If load modulation is used for communication in wireless power transfer, then communication functionality is achieved, but electromagnetic interference and acoustic noise increase
Solution Approach 1:
The patent extracts the communication function from the power transfer signal by using separate communication channels (Bluetooth, NFC, or other wireless communication protocols). This separates the data transmission from the power transmission, allowing communication to occur without modulating the power signal, thereby eliminating the electromagnetic interference and acoustic noise caused by load modulation while maintaining reliable communication functionality.
2Reliability
If separate communication functionality (Bluetooth, NFC) is used, then communication reliability improves, but device complexity and cost increase
Solution Approach 1:
The patent implements a dynamic communication architecture that can adaptively select between different communication modes based on device capabilities and operational requirements. The system can dynamically switch between using separate communication functionality (Bluetooth, NFC) when available and using load modulation on the power signal when devices lack separate communication capabilities, thereby maintaining reliability while managing complexity through adaptive behavior rather than requiring all devices to have all communication modules.
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 enhances communication reliability, reduces electromagnetic and acoustic noise, improves electromagnetic compatibility, and facilitates interworking with legacy devices, allowing efficient power transfer and adaptation to diverse device capabilities.
Implementation Method 1
an input circuit comprising a receiver coil arranged to extract power from the power transfer signal
Implementation Method 2
a transmitter arranged to transmit a set of data symbols to the power transmitter by load modulating the power transfer signal
Data Source
AI summary
A power transmitter (101) provides power to a power receiver (105) via an inductive power transfer signal which is also used by the power receiver (105) for communication by load modulation. The power receiver (105) comprises a transmitter (509) arranged to transmit symbols in accordance with a first or second communication mode where the first mode modulates data symbols by a chip sequence from a set of sequences and the second communication mode does not. The power receiver (105) may transmit data symbols requesting a power transfer signal variation using a chip sequence from the set. A detector (515) may detect if the variation occurs, and if so a selector (513) selects the first communication mode and otherwise it selects the second communication mode. The approach may allow selection of an appropriate communication mode without requiring data to be transmitted from the power transmitter. The approach may provide improved backwards compatibility.