Self-Diagnostic LED Lamp for Emergency Lighting
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Solution Overview
Problem
Existing LED lamp solutions, such as ballast-compatible and AC mains-operable LED lamps, face challenges in cost-effectiveness, maintenance complexity, and compliance with safety and regulatory requirements, particularly in emergency lighting systems, where self-diagnostic mechanisms are lacking to ensure reliable operation and battery health.
Innovation Solution
A linear LED lamp with a self-diagnostic circuit and charging detection and control system that integrates a rechargeable battery backup, enabling dual-mode operation and periodic auto-testing of charging and discharging currents, ensuring reliable emergency lighting and reducing maintenance costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a ballast-compatible LED lamp is used to replace a fluorescent lamp, then the initial replacement cost is low and installation is straightforward, but the total cost of ownership increases due to ballast power consumption, compatibility issues requiring additional ballast replacements, and complex maintenance requirements
Solution Approach 1:
The patent extracts and removes the ballast component from the lighting system entirely. The LED lamp is designed to operate directly from AC mains power without requiring a ballast, eliminating the compatibility issues and maintenance burden associated with ballasts while reducing total cost of ownership.
Solution Approach 2:
The LED lamp integrates multiple functions into a single unit: it serves as both the light source and the power management system. The lamp can operate in normal mode with AC mains power and automatically switch to emergency mode using an integrated rechargeable battery when mains power fails, eliminating the need for separate ballast and emergency lighting systems.
2Ease of operation
If a ballast-compatible LED lamp is used, then initial replacement is simple, but maintenance complexity increases as the lamp operates longer than the ballast requiring additional ballast replacements
Solution Approach 1:
The patent merges the LED light source, power supply management, and emergency battery backup into a single integrated unit. This eliminates the separate ballast component that would otherwise require independent replacement, simplifying maintenance to a single replaceable unit while reducing long-term operational complexity.
3Adaptability or versatility
If a ballast is used to operate the LED lamp, then the LED lamp can be operated with existing fixtures, but the ballast constantly draws power even when the LED lamp is dead or not installed
Solution Approach 1:
The patent removes the ballast component entirely and designs the LED lamp to operate directly from AC mains power. This eliminates the constant power draw associated with ballasts while maintaining compatibility with standard electrical fixtures, reducing energy waste especially when lamps are not installed or have failed.
4Reliability
If an AC mains-operable LED lamp is used, then the lamp is self-sustaining and does not require a ballast, but the ballast must be removed or bypassed which requires an electrician
Solution Approach 1:
The LED lamp is designed with universal compatibility to operate in multiple modes: normal AC mains operation and emergency battery backup. The integrated design allows end-users to simply replace the lamp without requiring electricians to remove or bypass ballasts, combining the benefits of self-sustaining operation with ease of installation.
5Reliability
If emergency lighting requirements are implemented with separate emergency light packages, then regulatory compliance is achieved, but the system complexity and cost increase
Solution Approach 1:
The patent integrates emergency lighting functionality directly into the standard LED lamp by incorporating a rechargeable battery and control circuitry. The lamp automatically switches between normal and emergency modes, eliminating the need for separate emergency light packages while achieving regulatory compliance and reducing system complexity.
Solution Approach 2:
The LED lamp serves dual purposes: it functions as a standard lighting fixture during normal operation and as an emergency lighting source when mains power fails. This multi-functionality achieves emergency lighting compliance without requiring separate dedicated emergency lighting systems.
Data Source
AI summary
A linear light-emitting diode (LED) lamp comprising a normally operated portion and an emergency-operated portion is used to replace a luminaire operated only in a normal mode with alternate-current (AC) mains. The normally operated portion comprises LED arrays and a power supply whereas the emergency-operated portion comprises a rechargeable battery, a charging circuit, an LED driving circuit, a self-diagnostic circuit, and a charging detection and control circuit. The linear LED lamp can auto-switch from the normal mode to an emergency mode or the other way around according to availability of the AC mains and whether a rechargeable battery test is initiated. The self-diagnostic circuit comprises multiple timers and is configured to provide multiple sequences and to auto-evaluate battery performance according to the multiple sequences. During an auto-evaluation period, a terminal voltage on the rechargeable battery is examined with test results displayed in a status indicator.