LED Lighting System Fault Detection and Automatic Disconnection
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Solution Overview
Problem
LED retrofit lamps face uncontrollable temperature increases due to defective light-emitting diodes, which can damage electronic components and pose safety risks, and existing systems lack effective mechanisms to automatically disconnect faulty diodes from the current source.
Innovation Solution
A lighting system incorporating a monitoring output, a comparator, and a switch that automatically disconnects a defective light-emitting diode from the current source by detecting fault signals, using a Schmitt comparator and shunt-diode configuration to generate a fault signal and control the switch, ensuring safe disconnection and compliance with safety standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a light-emitting diode is operated without monitoring and protection, then the device complexity is reduced, but uncontrollable temperature increases occur leading to damage of electronic components and safety risks
Solution Approach 1:
The patent implements preliminary action by incorporating a monitoring output that continuously monitors the light-emitting diode during operation before a fault can cause damage. The comparator is pre-configured with threshold values to detect abnormal conditions (such as current leakage or short circuits) and trigger the switch to disconnect the defective LED from the current source, preventing temperature increases and component damage before they occur.
2Reliability
If a monitoring system with comparator and switch is added to detect and disconnect defective diodes, then reliability and safety are improved, but device complexity increases
Solution Approach 1:
The patent applies feedback by using a monitoring output that continuously monitors the light-emitting diode's operational state and feeds this information to a comparator. The comparator compares the monitored parameters against pre-set threshold values and provides feedback control to a switch, which automatically disconnects the defective LED from the current source when abnormal conditions are detected, creating a closed-loop protection system.
Solution Approach 2:
The patent uses an intermediary approach by introducing a comparator as a mediating component between the monitoring output and the switch. The comparator acts as an intelligent intermediary that processes the monitoring signals, compares them against threshold values, and generates control signals to activate the switch only when necessary, thereby automating the protection function without requiring complex control logic.
3Loss of time
If defective light-emitting diodes are not disconnected automatically, then loss of time for manual intervention is avoided, but damage to electronic ballast and further electronics occurs
Solution Approach 1:
The patent implements self-service by enabling the lighting system to automatically monitor and protect itself without external intervention. The monitoring output continuously checks the light-emitting diode's status, the comparator automatically evaluates whether fault conditions exist by comparing monitored parameters against thresholds, and the switch autonomously disconnects defective LEDs from the current source, allowing the system to service itself and prevent damage without human involvement.
Data Source
AI summary
A lighting system is provided. The lighting system includes at least one light-emitting diode and a monitoring output, and a fault signal is present at the monitoring output in the event of a defect of the light-emitting diode during operation of the lighting system. The lighting system also includes a switch for switching a connection between a current source and the light-emitting diode. The lighting system further includes a comparator which is coupled with the monitoring output and the switch. The current source is disconnected from the light-emitting diode in an activated state of the switch, and the comparator is configured to switch the switch into the activated state when the fault signal is present at the monitoring output.