PCB Moisture Intrusion Detection Using Multiplexed Sensor Circuits
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Solution Overview
Problem
Current semi-rugged computers lack an airtight design, allowing moisture to enter during humidity tests, potentially damaging chips, and there is no effective method to detect moisture intrusion and provide timely notification.
Innovation Solution
A liquid intrusion detection device comprising a circuit board with multiple liquid detection components, a multiplexer, and a computing component that switches the multiplexer to output detection signals to the liquid detection components and issues a notification when a response signal meets a preset potential.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple liquid detection components are disposed on the circuit board, then liquid intrusion detection capability is improved, but device complexity increases
Solution Approach 1:
Multiple liquid detection components are integrated onto a single circuit board, combining multiple detection functions into one unified platform. This allows simultaneous monitoring of multiple areas for liquid intrusion while maintaining a compact design that does not significantly increase overall device complexity.
Solution Approach 2:
The circuit board serves multiple functions: it acts as both the structural platform for mounting detection components and as the processing unit for analyzing detection signals. This multi-functionality reduces the need for separate dedicated components, thereby improving detection capability without proportionally increasing complexity.
2Measurement precision
If additional detection components are installed on the circuit board, then liquid intrusion detection capability is improved, but manufacturing cost increases
Solution Approach 1:
Multiple detection components are combined on a single circuit board using standard mounting techniques, allowing for efficient manufacturing processes. The integrated design enables batch production and reduces assembly steps compared to installing separate detection systems in multiple locations.
Solution Approach 2:
The detection components use uniform mounting methods and connection protocols, simplifying the manufacturing process. All detection components follow the same integration pattern, which reduces variability in assembly procedures and lowers manufacturing costs through standardization.
3Measurement precision
If multiple computing components are used to process detection signals, then detection accuracy is improved, but device complexity and cost increase
Solution Approach 1:
A single computing component is designed to perform multiple detection and processing functions. It can analyze signals from all liquid detection components, process different types of detection data, and execute various response protocols, eliminating the need for multiple specialized computing components while maintaining high detection accuracy.
Solution Approach 2:
The computing component processes detection signals in a segmented, step-by-step manner, analyzing each detection channel sequentially or in parallel groups. This modular processing approach allows complex multi-channel detection to be handled by a single processor without overwhelming its capacity, maintaining detection accuracy while avoiding the need for multiple computing components.
Data Source
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AI summary
A liquid intrusion detection device (10) comprises at least one circuit board (100), a plurality of liquid detection components (101a, 101b), a multiplexer (102) and a computing component (103). The plurality of liquid detection components (101a, 101b) are disposed on the at least one circuit board (100). The multiplexer (102) is disposed on the at least one circuit board (100) and has a plurality of output pins respectively connected to the plurality of liquid detection components (101a, 101b). The computing component (103) is disposed on the at least one circuit board (100) and connected to the multiplexer (102), and is configured to switch the multiplexer (102) to output a detection signal to one of the plurality of liquid detection components (101a, 101b) through one of the plurality of output pins, and output a liquid intrusion notification signal when a response signal of the detection signal meets a preset potential.