Flowmeter Pulse Output Isolation Circuit for EMC Stability

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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, which isolates the internal processing system from external interference through electrical-optical-electrical conversion, using a photoelectrical coupler to transmit signals.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a pulse signal output circuit is added to the flowmeter, then the flowmeter can output pulse signals for measurement accuracy detection, but the electromagnetic compatibility protection becomes poor, leading to crashes or resets during electromagnetic compatibility tests

Engineering Contradiction:

Improvepulse signal output capabilityVSAvoidelectromagnetic compatibility stability

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent introduces an isolated amplifier as an intermediary component between the internal processing system and the external pulse signal output circuit. This isolated amplifier acts as a mediator that transfers signal information while blocking electromagnetic interference from propagating into the internal system, thus resolving the contradiction between pulse output capability and electromagnetic compatibility stability

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent segments the flowmeter system into electrically isolated sections: the internal processing system and the external pulse output circuit, separated by the isolated amplifier. This segmentation allows each section to operate independently with its own electrical reference, preventing electromagnetic interference from affecting the internal system while maintaining pulse signal output functionality

Inventive Principle:

Principle #1Segmentation

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

Enhances the flowmeter's resistance to external interference, preventing crashes or resets during electromagnetic compatibility tests.

Implementation Method 1

the photoelectrical coupler is configured to perform electrical-optical-electrical conversion processing on the received source pulse signal

Methodology Applied

Scientific EffectPhotoelectrical conversion: Photoelectric Effect

Data Source

PatentUS12529583B2Pulse signal output circuit and flowmeter

Publication Date: 2026.01.20 TANCY INSTR GRP

AI summary

Provided are a pulse signal output circuit and a flowmeter. The pulse signal output circuit includes a signal-receiving module, a photoelectrical coupler, a signal conversion module; where the signal-receiving module is connected to the photoelectrical coupler, and the photoelectrical coupler is connected to the signal conversion module; the signal-receiving module is configured to receive a source pulse signal acquired by the flowmeter, and send the source pulse signal to the photoelectrical coupler; the photoelectrical coupler 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; the signal conversion module is configured to perform conversion processing on the received electrical signal to obtain and output an output pulse signal corresponding to the source pulse signal.