Wireless Power Transfer Load Modulation for Reliable Symbol Detection
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Solution Overview
Problem
Existing wireless power transfer systems face challenges such as electromagnetic interference, acoustic noise, and communication errors due to load modulation, particularly in high power applications, which affect electromagnetic compatibility and backwards compatibility.
Innovation Solution
A power transfer system using a combination of first and second binary chip sequences for load modulation, with a combined correlation value detection method to improve communication reliability and reduce noise, allowing flexible and efficient power transfer.
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 segments the load modulation signal into distinct phases: power transfer phases and communication phases. During communication phases, the system specifically modulates the load to encode data bits, while during power transfer phases, normal power delivery continues. This temporal segmentation allows communication functionality to be achieved without continuously generating electromagnetic interference and acoustic noise, thus resolving the contradiction between communication reliability and harmful factors.
Solution Approach 2:
The system employs periodic load modulation to achieve communication. Data is transmitted by periodically varying the load during designated communication phases, creating structured electromagnetic signals that can be reliably detected. The periodic nature of this modulation, confined to specific time windows, reduces overall electromagnetic interference compared to continuous modulation, while maintaining sufficient communication reliability through the structured periodic signal patterns.
2Loss of information
If load modulation is used for communication in wireless power transfer, then communication functionality is achieved, but acoustic noise increases
Solution Approach 1:
The patent segments the operational cycle into power transfer phases and communication phases. Acoustic noise is generated only during communication phases when load modulation is actively used for data transmission. During power transfer phases, the system operates without the modulating loads that cause acoustic noise. This temporal segmentation reduces overall acoustic noise generation while maintaining communication reliability through the dedicated communication phases.
3Power
If wireless power transfer system is designed for high power applications, then power transfer capability is improved, but electromagnetic compatibility becomes more difficult to maintain
Solution Approach 1:
The system dynamically adjusts its operational mode based on real-time conditions. The controller monitors the wireless power transfer system and dynamically switches between power transfer phases and communication phases, adjusting load modulation depth and frequency accordingly. This dynamic operation allows the system to maintain high power transfer capability when needed while reducing electromagnetic interference during communication phases, thus improving overall electromagnetic compatibility without sacrificing power transfer capability.
Solution Approach 2:
The system employs feedback mechanisms where the receiver communicates back to the transmitter about received power levels and communication data. This feedback loop allows the transmitter to adjust its output power and modulation characteristics in real-time, maintaining optimal power transfer while minimizing electromagnetic interference. The feedback-driven adaptive control enables the system to maintain electromagnetic compatibility even at high power levels by making real-time adjustments to operational parameters.
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 enhances communication reliability, reduces electromagnetic interference and acoustic noise, and maintains backwards compatibility while optimizing power transfer efficiency.
Implementation Method 1
power is inductively transferred from a transmitter coil in a power transmitter device to a receiver coil in the individual devices
Implementation Method 2
power is inductively transferred from a transmitter coil in a power transmitter device to a receiver coil in the individual devices
Data Source
AI summary
A power receiver (105) communicates to a power transmitter (101) using load modulation data symbols modulated by a chip sequence being a combination of two binary sequences. The power transmitter (101) comprises a data receiver (207) which includes a chip determiner (903) determining a received chip sequence and two correlators (905. 907) which correlates this sequence with the two binary sequences. The two correlation results are combined into a single correlation value by a combiner (905). A detector (917) detects a received data symbol value in response to the combined correlation value. The approach may provide improved detection of data symbols and improved communication from the power receiver (105) to the power transmitter (101).