Wireless Power Beam Safety Control Using Delta Signal Feedback
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Solution Overview
Problem
Current wireless power transmission systems face challenges in safely transmitting power over reasonable distances for office or domestic environments, as they often result in beam-generated damage due to power loss and misdirection, failing to comply with safety regulations and efficiently manage exposure times.
Innovation Solution
A system that calculates the Δ signal representing power loss between the transmitter and receiver, dynamically sets a waiting period (Tdelay) to avoid premature shutdowns, and uses an event clock to monitor power changes, ensuring compliance with safety regulations by adjusting operational parameters such as power level and beam direction to prevent hazardous exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the beam power is increased to transmit sufficient charging power over reasonable distances, then the power transmission capability is improved, but the risk of beam-generated damage to sensitive objects and equipment increases
Solution Approach 1:
The system continuously monitors the power received by the receiver and compares it with the transmitted power level. When a discrepancy is detected indicating potential beam misdirection or obstruction, the system provides feedback to adjust or terminate the beam, preventing damage to sensitive objects while maintaining high power transmission capability
Solution Approach 2:
The system performs preliminary scanning of the environment to identify sensitive objects and equipment before initiating high-power beam transmission. This preliminary action allows the system to plan safe transmission paths and avoid directing high-power beams at vulnerable targets
2Reliability
If the beam transmission is continuously monitored to detect power loss and prevent damage, then the safety is improved, but the system complexity increases
Solution Approach 1:
The receiver device autonomously measures the received power and communicates this information back to the transmitter. The transmitter uses this self-reported data to monitor beam integrity and detect obstructions, enabling safety monitoring without requiring complex external surveillance systems
Solution Approach 2:
The system discards transmitted power that does not reach the receiver by detecting power loss through comparison of transmitted and received power levels. When obstructions are detected, the system terminates the beam to the affected area, effectively discarding the misplaced energy and preventing damage
3Speed
If the system responds rapidly to detected power loss to prevent damage, then the safety response time is improved, but the false shutdown rate increases due to noise sensitivity
Solution Approach 1:
The system dynamically adjusts its response characteristics based on the magnitude and duration of detected power loss. For small fluctuations within expected ranges, the system applies filtering and requires sustained deviations before triggering shutdown. For large, sustained power loss indicating real obstructions, the system responds rapidly with appropriate safety measures
Solution Approach 2:
The system applies partial monitoring and response actions for small power variations, using filtering and threshold-based decisions to avoid false shutdowns. For excessive power loss beyond safe thresholds, the system implements full safety response with rapid shutdown, ensuring adequate protection without over-reacting to normal variations
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 effectively reduces the risk of beam-generated damage by accurately managing power exposure times and adapting to changing conditions, ensuring safe and efficient wireless power transmission while adhering to regulatory limits.
Implementation Method 1
The transmitter may use a laser beam, or another high-energy beam, to supply receivers with power
Implementation Method 2
equipped with a photovoltaic cell to convert the beam received by the transmitter to usable energy
Data Source
AI summary
Methods and systems for safely and effectively supplying a beam of wireless power from a transmitter to at least one receiver. A delta signal is generated by repeatedly calculating the difference in power between the power of the beam emitted by the transmitter and the amount of power received at the receiver. The system dynamically generates a time delay, which is a time period shorter than the maximal exposure duration relating to safe exposure durations for the power level of the delta signal. If the time delay is exceeded, the system changes an operational parameter of the system, such as terminating the beam. Because of limitations to building a perfect timing system, the system is built to be more sensitive to time delays having longer safe exposure durations, with large delta signals having short safe exposure durations being responded to immediately and without significant regard to the time delay.