Combined logic control circuit and sewage treatment system
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Solution Overview
Problem
Centralized control systems, such as PLC and PAC, face issues with reliability, compatibility, and susceptibility to communication and electric energy interference, limiting their expandability and effectiveness in various industrial environments.
Innovation Solution
A combined logic control circuit with signal input, control, and signal output components, along with a power switch component, that performs photoelectric isolated transmission and conversion of communication and power signals, enhancing isolation and interference resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PLC or PAC is used as centralized control center with internal integrated control mode, then circuit control functions can be realized, but the system is prone to communication interference and electric energy transmission interference from external interference sources
Solution Approach 1:
The control system is divided into multiple independent modules including signal input components, control components, signal output components, and power switch components. Each module operates independently with isolated signal paths, preventing interference propagation while maintaining centralized control functionality.
Solution Approach 2:
Photoelectric isolation technology is introduced as an intermediary between different signal paths and between the control system and external devices. This mediator converts electrical signals to optical signals and back, blocking electromagnetic interference and ground loops while maintaining signal transmission.
2Adaptability or versatility
If PLC or PAC with determined internal integrated control mode is used, then centralized control can be achieved, but the system has poor expandability when circuit control functions need to be added or reduced according to actual needs
Solution Approach 1:
The control system adopts dynamic configuration capabilities where signal input components, control components, and signal output components can be selectively activated or deactivated based on actual control needs. The photoelectric isolation modules can be dynamically configured to establish or break signal paths, allowing flexible adaptation to different control requirements without hardware changes.
3Object-affected harmful factors
If photoelectric isolated transmission and conversion is implemented in combined logic control circuit, then anti-interference performance is enhanced, but device complexity increases
Solution Approach 1:
The photoelectric isolation modules serve multiple functions simultaneously: they provide electromagnetic isolation, ground isolation, signal transmission, and electrical protection. By using universal modules that perform multiple functions, the system achieves high anti-interference performance without proportionally increasing complexity, as each module consolidates several protection and transmission functions into a single component.
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 solution provides high reliability, expandability, and compatibility, ensuring stable and flexible control of external electrical devices across different industrial environments, improving anti-interference performance and meeting diverse circuit control requirements.
Implementation Method 1
transmit one path of the first communication signal in a photoelectric isolated manner
Implementation Method 2
convert the power signal in an isolated manner and output the power signal converted in the isolated manner
Data Source
AI summary
A combined logic control circuit and a sewage treatment system are provided. The combined logic control circuit includes: at least one signal input component, a control component and at least one signal output component; each signal input component transmits at least one path of first communication signal in a photoelectric isolated manner and converts the first communication signal into a second communication signal; the control component generates at least one path of first control signal according to the at least one path of second communication signal; and each signal output component processes one path of the first control signal to control at least one external electrical device, thereby implementing a particular circuit function; and the power switch component provides power supply to the various circuit components in a photoelectric isolated manner.