Multi-Level Electronic Protection for Digital Control Outputs
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Solution Overview
Problem
Existing electronic circuit protection systems for industrial processes fail to provide effective, non-destructive short circuit and overcurrent protection for multiple digital control outputs without requiring operator intervention, leading to potential equipment damage and maintenance needs.
Innovation Solution
A multi-level over-current electronic protection system utilizing solid state reversibly interruptible electronic switches with control logic and a CPU-based monitoring system that automatically interrupts power to faulted channels and prevents automatic restart until the fault is cleared, eliminating the need for maintenance like fuse replacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional fuse-based protection is used, then short circuit protection is provided, but the system requires operator intervention and maintenance
Solution Approach 1:
The electronic protection system automatically detects overcurrent conditions, interrupts faulted channels, and prevents automatic restart without operator intervention. The system monitors itself and takes corrective action, eliminating the need for manual fuse replacement or system reset.
Solution Approach 2:
The patent replaces traditional mechanical fuse-based protection with solid-state electronic switches and electronic control logic. This substitution enables automated monitoring and protection while eliminating mechanical components that require manual replacement.
2Productivity
If automatic restart is enabled after fault interruption, then system availability is improved, but oscillation between ON and OFF states occurs
Solution Approach 1:
The control logic continuously monitors current levels in each output channel and uses this feedback to determine when to interrupt protection and when to prevent automatic restart. By comparing real-time current measurements against threshold values, the system avoids oscillation while maintaining availability.
Solution Approach 2:
The system prevents automatic restart until fault conditions are fully cleared by monitoring current levels beforehand. This preliminary verification ensures that restarting occurs only when safe, eliminating oscillation between ON and OFF states.
3Reliability
If multi-level protection is implemented, then protection comprehensiveness is improved, but device complexity increases
Solution Approach 1:
The protection system is divided into multiple independent levels, with each electronic switch providing protection for specific output channels. This segmentation allows comprehensive protection while maintaining modular simplicity, as each level operates independently and can be configured for specific channels.
Solution Approach 2:
The electronic protection system provides multiple functions within a single integrated structure: overcurrent detection, fault interruption, automatic restart prevention, and system monitoring. This multi-functionality achieves comprehensive protection without proportionally increasing complexity.
4Ease of repair
If solid state electronic switches are used instead of fuses, then maintenance requirements are reduced, but cost of components increases
Solution Approach 1:
The solid-state electronic switches automatically detect and respond to fault conditions without requiring manual intervention or replacement. This self-service capability eliminates maintenance requirements while the integrated control logic manages the entire protection process.
Solution Approach 2:
The patent replaces mechanical fuses with solid-state electronic switches and electronic control systems. This substitution eliminates components that require physical replacement while adding automated monitoring and control capabilities.
Data Source
AI summary
An over-current electronic protection system includes a first solid state reversibly interruptible electronic switch including first output control logic and first controlled output channels controlled by the first control logic. The first output control logic reversibly interrupts power at any output channel when their current exceed limits. The system includes a second solid state reversibly interruptible electronic switch including second control logic and second controlled outputs. A power supply input of the second switch is coupled to one of the first controlled output channels to receive the power. The second controlled outputs provide power to loads under normal operating conditions and reversibly interrupt the power for second output channels when their current exceeds limits. A CPU having is coupled to the second output channels and external inputs of the second switches via an isolation device to provide a supervisory and monitoring function.