Bit Inversion Encoding for Thermal Mitigation in Wireless Power Transfer
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Solution Overview
Problem
Current wireless power and data transfer systems face limitations in thermal efficiency, with excess heat generation leading to performance degradation and user experience issues, and in-band communications offer slow data rates unsuitable for device-related data transfer.
Innovation Solution
Implementing software-based thermal mitigation methods that encode data signals with more 'off' or 'low' pulses to reduce thermal losses, combined with buffered communications to simulate two-way data transfer over a single inductive connection, using protocols like UART or NFC.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If in-band communications are used for data transfer in wireless power systems, then data can be transmitted over the same channel, but data rates are limited to slow speeds (1-3 kilobytes per second)
Solution Approach 1:
The patent applies periodic action by using pulse-based communication where data is transmitted through periodic on/off states of the power transfer signal. This allows higher data rates by encoding multiple bits per pulse cycle while maintaining thermal efficiency through controlled duty cycles that reduce continuous power dissipation.
Solution Approach 2:
The patent changes the parameter of signal encoding by transitioning from traditional in-band modulation to pulse-width modulation (PWM) and amplitude-shift keying (ASK) schemes. These parameter changes enable faster data transfer rates while allowing dynamic adjustment of power levels to optimize thermal performance during different communication phases.
2Use of energy by moving object
If wireless power transfer operates at high power levels, then power transfer efficiency is improved, but thermal losses and heat generation increase
Solution Approach 1:
The patent applies dynamics by implementing dynamic power level adjustment and adaptive impedance matching that respond to real-time thermal conditions. The system dynamically switches between different power transfer modes and communication protocols based on thermal feedback, allowing high efficiency operation when thermal conditions permit while preventing overheating.
Solution Approach 2:
The patent implements beforehand cushioning through proactive thermal management strategies including pre-cooling phases, thermal throttling algorithms that anticipate overheating conditions, and duty cycle modulation that prevents thermal accumulation before it becomes problematic. This allows sustained high-power operation by preparing for thermal limits in advance.
3Loss of energy
If bit inversion encoding is implemented to emphasize low pulses for thermal mitigation, then thermal losses are reduced, but signal encoding complexity increases
Solution Approach 1:
The patent applies inversion by deliberately inverting the conventional encoding approach - instead of emphasizing high pulses for data transmission, it inverts the logic to emphasize low or zero-power pulses. This thermal-aware encoding inverts traditional assumptions about signal strength requirements, achieving thermal mitigation while maintaining decodable signal integrity through receiver-side inversion compensation.
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
Enhances thermal performance and efficiency while enabling faster data transfer, eliminating the need for wired connections and maintaining interoperability with legacy systems.
Implementation Method 1
inductive wireless power transfer, which occurs when magnetic fields created by a transmitting element induce an electric field, and hence, an electric current, in a receiving element
Data Source
AI summary
A method for operating a wireless power transfer system is configured for utilizing software for the purposes of thermal mitigation, via re-encoding data in a bitstream for data communicated in-band of wireless power transfer. The data is encoded as binary messages and, during a message of the bit stream, if the number of high pulses is greater than the number of low pulses, then the message is inverted, such that each of the high pulses of the message invert to a low pulse and each of the low pulses of the message invert to a high pulse. Thus, the data signals will always have 50% or less low pulses in the bit stream.