Optical Arc Detection via Light Pipe and Photodetector
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Solution Overview
Problem
Existing optical systems for detecting electrical arcs in power supplies are prone to single-point failures and often fail to quickly detect arcs in various locations, leading to significant damage before detection, as they are not well-suited for applications requiring redundancy and are delayed in identifying arcs.
Innovation Solution
A method utilizing a light pipe and photodetector system that captures and transmits light associated with electrical arcs, coupled with a signal processor to differentiate between arc and non-arc signals, enabling rapid detection and intervention, including the use of a digital signal processor to analyze the intensity, amplitude, and frequency of the detected light for accurate arc identification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single optical detection system is used, then the device complexity is reduced, but the reliability deteriorates due to single-point failure
Solution Approach 1:
The detection system is divided into multiple independent optical detection systems, each monitoring a specific zone. Each system includes its own light pipe, photodetector, and signal processing circuitry, eliminating single-point failure and improving overall system reliability without excessive complexity increase.
Solution Approach 2:
The system transitions from a single centralized detection point to a distributed spatial arrangement of multiple detection systems positioned at different locations and angles, enabling comprehensive coverage of various arc locations while maintaining manageable system complexity.
2Speed
If optical detectors are positioned close to power cells, then arc detection speed is improved, but the risk of damage from direct arc exposure increases
Solution Approach 1:
A light pipe serves as an intermediary component that physically separates the photodetector from the arc source. The light pipe captures light from nearby arcs and transmits it to the photodetector, enabling close proximity detection while protecting the sensitive photodetector from direct arc exposure and associated harmful effects.
3Adaptability or versatility
If multiple detection systems are deployed to cover various locations, then detection coverage is improved, but the device complexity increases
Solution Approach 1:
Each optical detection system is designed as a universal, self-contained module capable of independent arc detection. The standardized design with identical light pipes, photodetectors, and signal processing circuits allows multiple systems to be deployed across different locations without proportionally increasing overall system complexity, as each module performs the same function independently.
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 solution provides robust and timely detection of electrical arcs, reducing damage by enabling immediate power interruption and ensuring system redundancy, thereby enhancing the reliability of power supplies.
Implementation Method 1
capturing light with a light pipe, transmitting the captured light along at least a portion of a length of the light pipe
Implementation Method 2
optically detecting the transmitted light with a photodetector which is optically coupled to the light pipe, generating a signal which is indicative of an intensity of the detected light
Data Source
AI summary
A method for optically detecting an electrical arc in a power supply. The method includes capturing light with a light pipe, transmitting the captured light along at least a portion of a length of the light pipe, optically detecting the transmitted light with a photodetector which is optically coupled to the light pipe, generating a signal indicative of an intensity of the detected light, and determining whether the detected light is associated with an electrical arc.