Optocoupler Pulse Output Circuit for EMC-Stable Flowmeters
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Solution Overview
Problem
Flowmeters with pulse signal output circuits suffer from poor electromagnetic compatibility protection, leading to crashes or resets during electromagnetic compatibility tests.
Innovation Solution
A pulse signal output circuit incorporating a signal-receiving module, photoelectrical coupler, and signal conversion module to insulatively isolate the signal-receiving module from the signal conversion module, using electrical-optical-electrical conversion to enhance resistance to external interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a pulse signal output circuit is added to the flowmeter, then the flowmeter can output pulse signals for accuracy detection, but the electromagnetic compatibility protection becomes poor, leading to crashes or resets during electromagnetic compatibility tests
Solution Approach 1:
The patent introduces a photoelectrical coupler as an intermediary component between the signal-receiving module and the signal conversion module. This coupler converts electrical signals to optical signals and back, creating an isolating barrier that prevents electromagnetic interference from propagating through the circuit while still allowing signal transmission, thus resolving the contradiction between pulse signal output capability and electromagnetic compatibility stability
Solution Approach 2:
The patent replaces direct electrical signal transmission with optical signal transmission through the photoelectrical coupler. By substituting the electrical field-based signal transmission with light-based transmission, the system achieves electromagnetic isolation while maintaining signal integrity, thereby improving reliability during electromagnetic compatibility tests
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
The circuit design prevents crashes or resets during electromagnetic compatibility tests by isolating the internal processing system from external interference, ensuring reliable operation.
Implementation Method 1
A pulse signal output circuit is provided, including a signal-receiving module, a photoelectrical coupler and a signal conversion module; the signal-receiving module is connected to the photoelectrical coupler, and the photoelectrical coupler is connected to the signal conversion module
Data Source
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AI summary
Provided are a pulse signal output circuit (50) and a flowmeter (11). The pulse signal output circuit (50) includes a signal-receiving module (21), a photoelectrical coupler (22), a signal conversion module (23); where the signal-receiving module (21) is connected to the photoelectrical coupler (22), and the photoelectrical coupler (22) is connected to the signal conversion module (23); the signal-receiving module (21) is configured to receive a source pulse signal acquired by the flowmeter (11), and send the source pulse signal to the photoelectrical coupler (22); the photoelectrical coupler (22) is configured to perform electrical-optical-electrical conversion processing on the received source pulse signal to obtain an electrical signal, and send the electrical signal to the signal conversion module (23); the signal conversion module (23) is configured to perform conversion processing on the received electrical signal to obtain and output an output pulse signal (41) corresponding to the source pulse signal.