Lighting Load Disconnect for 277 V Overvoltage Protection
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Solution Overview
Problem
Newer lighting systems with electronic and switching type components, such as LEDs, are vulnerable to damage from over voltage conditions, which can occur in 277 V lighting systems with shared neutrals.
Innovation Solution
A disconnect component that continuously monitors the line voltage and disconnects the load from the line when the voltage exceeds an acceptable level, thereby protecting the lighting system components from damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a disconnect component is added to protect against over voltage, then reliability of lighting system is improved, but device complexity increases
Solution Approach 1:
The patent introduces a disconnect component as an intermediary device between the power source and the lighting system. This mediator monitors voltage levels and automatically disconnects the load when over voltage conditions are detected, protecting sensitive electronic components without requiring complex redesign of the entire lighting system.
Solution Approach 2:
The disconnect component performs preliminary protective action by continuously monitoring voltage levels before damage can occur. When voltage exceeds safe thresholds, the device preemptively opens the circuit to prevent over voltage damage to ballasts, LED drivers, and other electronic components.
2Reliability
If continuous voltage monitoring is implemented, then protection effectiveness is improved, but energy consumption increases
Solution Approach 1:
The disconnect component is designed to draw minimal operating power from the circuit it protects, effectively using the system's own power resources to fund its protective function. The monitoring circuit operates on standby power available in the lighting system, requiring no additional external energy source while providing continuous over voltage protection.
Data Source
AI summary
A disconnect component coupled between a lighting load and a main power line. The disconnect component includes an input coupled to the main power line and a neutral line input to the disconnect component from the 277 volt circuit and an output coupled to the lighting load. The disconnect component includes a monitor that monitors a voltage on the main power line and a coupling component that couples the main power line to the output. The coupling component is configured to decouple the main power line from the output when the monitor senses a voltage on the main power line is higher than an upper limit voltage and re-couple the main power line to the output when the monitor senses that the voltage on the main power line is below the upper limit voltage.