Arc Signal Processing Circuit for Multi-Band Arc Fault Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing arc signal sampling technologies rely on a single fixed-frequency signal for identifying arc faults, which are characterized by strong randomness and interference from load noise, leading to inaccurate fault identification.
Innovation Solution
An arc signal processing circuit and method that utilizes an amplification module, band-pass filtering amplification module, and main control module to process arc signals, including high and low threshold voltage calculations, to accurately identify arc faults by analyzing half-wave signal amplitudes and arc energy values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single fixed-frequency signal is used for arc fault identification, then the device complexity is reduced, but the measurement precision deteriorates due to strong randomness and load noise interference
Solution Approach 1:
The patent segments the arc signal processing into multiple frequency bands using parallel band-pass filtering amplification circuits with different center frequencies. Each circuit processes a specific frequency range, and the results are combined to improve overall identification accuracy while managing system complexity through modular architecture
Solution Approach 2:
The patent transitions from single-frequency analysis to multi-frequency band analysis by adding the frequency dimension. Multiple band-pass filtering amplification circuits operate in parallel at different center frequencies, transforming the problem from one-dimensional to multi-dimensional signal processing to capture the complex characteristics of arc faults
2Measurement precision
If multiple band-pass filtering amplification circuits are used to process different frequency bands, then the measurement precision is improved, but the device complexity increases
Solution Approach 1:
Each band-pass filtering amplification circuit is designed with universal functionality to process its designated frequency band. The circuits share common design characteristics and can be scaled systematically, allowing the system to handle multiple frequency bands while maintaining manageable complexity through standardized modular components
Solution Approach 2:
The system dynamically processes signals across multiple frequency bands simultaneously, with each band-pass filtering amplification circuit actively processing its designated frequency range. The main control module dynamically coordinates the outputs from multiple circuits, enabling adaptive arc fault detection that responds to the dynamic characteristics of arc signals across different frequencies
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
Improves the accuracy of arc fault identification by filtering and amplifying arc signals in multiple frequency bands, using threshold comparisons to determine the presence of arc faults.
Implementation Method 1
an amplification module, having an input end connected to an arc signal, and configured to amplify the arc signal and output an amplified signal
Implementation Method 2
a band-pass filtering amplification module, having an input end electrically connected to an output end of the amplification module, and configured to filter and amplify the amplified signal output from the amplification module and output a high-frequency signal in a preset frequency band
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
Provided in the present application are an arc signal processing circuit and method, and an electrical device. The arc signal processing circuit includes: an amplification module, wherein an input end of the amplification module is connected to an arc signal, and the amplification module is used for amplifying the arc signal and then outputting an amplified signal; a band-pass filtering amplification module, wherein an input end of the band-pass filtering amplification module is electrically connected to an output end of the amplification module, and the band-pass filtering amplification module is used for filtering and amplifying the amplified signal outputted from the amplification module and then outputting a high-frequency signal in a preset frequency band; and a main control module, wherein the main control module is electrically connected to the output end of the amplification module, and the main control module is electrically connected to an output end of the band-pass filtering amplification module. In the present application, the amplitude of a half-wave signal and an arc energy value of the half-wave signal in a high-frequency signal are compared with corresponding threshold values, and whether an arc signal fault occurs is identified according to a comparison result, such that the accuracy in identification of arc fault of an electrical device is improved.