Analog Input Module Overvoltage Protection Stabilization
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Solution Overview
Problem
Analog input modules in programmable logic controllers (PLCs) are vulnerable to damage from overvoltage when converting analog signals from external devices, as the voltage levels of these signals exceed the operating voltage of the modules.
Innovation Solution
An apparatus is provided that includes an analog input module and a stabilization unit, where the stabilization unit supplies adjusted voltages to the analog input module, allowing the operating voltage to match the voltage level of incoming analog signals, thereby preventing damage from overvoltage by increasing or decreasing the voltage as necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the analog input module uses a fixed operating voltage level, then the module structure is simple and easy to manufacture, but the module is damaged when overvoltage signals are inputted
Solution Approach 1:
The patent applies the dynamics principle by making the operating voltage of the analog input module dynamically adjustable rather than fixed. The stabilization unit changes the operating voltage level according to the input signal characteristics, allowing the module to adapt to different voltage conditions and protect itself from overvoltage damage while maintaining operational functionality.
Solution Approach 2:
The patent implements parameter changes by modifying the operating voltage parameter of the analog input module based on the input signal voltage level. The stabilization unit detects the input signal characteristics and adjusts the operating voltage parameter accordingly, enabling the module to handle overvoltage signals without damage while preserving its signal processing capabilities.
2Adaptability or versatility
If the operating voltage is increased to match overvoltage signal levels, then the module can process higher voltage signals, but the module consumes more power and may be damaged by the increased voltage
Solution Approach 1:
The stabilization unit dynamically adjusts the operating voltage to match the input signal level only when necessary, rather than maintaining a constantly high voltage level. This dynamic adaptation allows the module to process different voltage levels while minimizing power consumption during normal operation.
Solution Approach 2:
The analog input module with the stabilization unit automatically detects the input signal voltage level and adjusts its own operating voltage accordingly, without requiring external intervention. This self-service mechanism ensures voltage compatibility while avoiding unnecessary power consumption by only increasing voltage when overvoltage signals are detected.
Data Source
AI summary
Disclosed is an apparatus for protecting an analog input module from overvoltage, the apparatus including an analog input module and a stabilization unit. The analog input module converts one of a plurality of positive/negative analog signals inputted from the outside thereof into a digital signal and insulates the converted digital signal. The stabilization unit supplies voltages of the positive/negative analog signals to the analog input module when the voltage levels of the plurality of positive/negative analog signals are higher than the levels of positive/negative operating voltages in the analog input module.