Power Switching Control for Overload Recovery Without Component Fatigue
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Solution Overview
Problem
Intelligent power electronic components in protection and switching devices fail prematurely due to fatigue from prolonged exposure to abnormal currents, leading to inoperability of controlled loads even after the overload condition has ceased.
Innovation Solution
A protection and switching device with control means that generate reversible and automatic commands to manage switching states based on predefined thresholds and external signals, ensuring the device remains operational during and after abnormal currents, with software modules for cost-effective implementation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the intelligent power electronic component is placed in non-conducting state to protect against overload, then the service life of the component is extended, but the controlled load cannot perform its functions even when no overload is present
Solution Approach 1:
The protection state of the intelligent power electronic component is made dynamic rather than static. The component transitions between conducting and non-conducting states based on real-time overload detection. When overload is detected, the component switches to non-conducting state for protection; when overload disappears, it automatically returns to conducting state, allowing the controlled load to resume functionality. This dynamic adaptation resolves the contradiction between extending component life and maintaining load productivity.
Solution Approach 2:
A feedback mechanism is implemented where the intelligent power electronic component continuously monitors the electrical conditions and provides feedback signals indicating overload status. Based on this feedback, the control system automatically adjusts the operating state of the component. The feedback loop ensures that the component only enters protection mode when necessary and automatically recovers when conditions normalize, preventing unnecessary shutdowns of the controlled load while protecting the component from damage.
2Productivity
If the intelligent power electronic component operates under abnormal currents for long periods, then the controlled load can continue to function, but the component develops fatigue and becomes inoperative
Solution Approach 1:
The intelligent power electronic component performs preliminary protective action by detecting abnormal currents before they cause permanent damage. The component monitors electrical parameters continuously and anticipates potential overload conditions. When abnormal currents are detected early, the component takes preventive action by switching to protection mode, preventing the development of fatigue that would lead to complete failure. This preliminary action allows the system to maintain reliability while minimizing interruptions to the controlled load.
3Reliability
If manual intervention is required to reset the switching means after overload, then the component is protected from fatigue, but the system requires human intervention and loses automation
Solution Approach 1:
The intelligent power electronic component is designed with self-service capability to automatically detect overload conditions, switch to protection mode, and then automatically recover when the overload condition disappears. The component monitors its own operational status and electrical parameters, making independent decisions about when to enter and exit protection mode without requiring manual intervention. This self-service mechanism maintains full automation while providing reliable protection against fatigue, resolving the contradiction between protection and automation.
Data Source
Figure 1~2
AI summary
The invention relates to a protection and commutation device (DP) that equips a piece of electronic equipment (EE) powering at least one controlled load (CC). Said device (DP) comprises: commutation means (MCN) that can be set in either a first or second state, in which they respectively allow and prohibit the powering of the controlled load (CC), according to an instruction, and deliver an alarm signal in the event of detection of an abnormal current; and control means (MCT) that can determine a value of a paramater, representative of a loss of reliability of the commutation means (MCN) induced by abnormal currents, according to delivered alarm signals, and generate an instruction for the definitive setting of the commutation means (MCN) in the second state when said determined value is higher than a first threshold.