Arc Detection Circuit Using Log Amplifier and Neural Processing
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Solution Overview
Problem
Commercial arc detectors face challenges in accurately distinguishing between actual arcs and load devices like brushed motors and switch mode power supplies, leading to high false detection rates and increased costs due to resource and power consumption, making them inefficient and costly, while known systems fail to distinguish between actual arcs and load devices.
Innovation Solution
An arc detection system combining analog domain circuitry with digital domain circuitry, utilizing a logarithmic amplifier to preprocess AC energy signals and a neural network processor unit (NNPU) for accurate arc detection, reducing computational resources and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If commercial arc detectors use traditional detection methods, then they can detect arcs, but they produce high false detection rates and consume excessive computational resources and power
Solution Approach 1:
The patent segments the arc detection process into two distinct domains: analog domain circuitry for initial signal processing and digital domain circuitry for final arc determination. This segmentation allows each domain to handle specific tasks optimally, reducing overall computational burden and power consumption while maintaining detection accuracy.
Solution Approach 2:
The patent introduces an intermediary analog domain circuit that processes AC energy signals before they reach the digital domain. This intermediary performs preliminary filtering and signal conditioning, reducing the complexity of digital processing required and thereby lowering power consumption of the digital components.
2Measurement precision
If commercial arc detectors use traditional detection methods, then they can detect arcs, but they consume excessive computational resources
Solution Approach 1:
The patent replaces complex digital signal processing mechanisms with simpler analog domain circuitry for preliminary signal processing. The analog circuit performs functions like filtering and signal conditioning that would otherwise require significant digital computational resources, thereby reducing device complexity while maintaining measurement precision.
3Reliability
If arc detectors trip circuit breakers frequently, then they prevent arc damage, but they cause unnecessary interruptions to legitimate load devices
Solution Approach 1:
The patent applies different detection criteria and processing methods to different signal characteristics. The analog domain circuitry processes specific frequency ranges and signal patterns that are characteristic of actual arcs, while legitimate load devices produce different patterns that are filtered out. This local quality approach ensures accurate differentiation between arcs and normal device operation.
Data Source
AI summary
An example apparatus includes: current measurement circuitry having an output, log amplifier circuitry having an input coupled to the output of current measurement circuitry and having an output, analog to digital conversion (ADC) circuitry having an input coupled to the output of the log amplifier circuitry and an output, and programmable circuitry having an input coupled to the output of the ADC circuitry and having an output, wherein the programmable circuitry is configured to detect an arc within an Alternating Current (AC) signal provided to the current measurement circuitry.