LED Emergency Power Conversion for Single-Driver Lamp Units
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Solution Overview
Problem
Existing lighting systems that incorporate both conventional and emergency LED lighting require separate drivers for normal and emergency modes due to the different characteristics of mains and battery supplies, leading to increased costs and complexity, making it difficult to add emergency functionality to existing systems.
Innovation Solution
A power supply system that includes an emergency mode converter, such as an isolated boost converter, which provides a DC output at a normal mains level, allowing an existing LED driver to be powered during emergencies, eliminating the need for a separate emergency driver by using a controllable switch to switch between mains and charge storage device power sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate drivers are used for mains and battery supplies, then the LED lamp unit can be driven in both normal and emergency modes, but the cost and device complexity increase
Solution Approach 1:
The LED driver is designed to perform multiple functions by accepting different input voltage ranges. The driver can operate with mains voltage (170-260V AC) during normal mode and battery voltage (18-36V DC) during emergency mode, eliminating the need for separate drivers while maintaining full emergency lighting functionality
Solution Approach 2:
The patent combines the mains driver and emergency driver functions into a single integrated LED driver unit. This unified driver receives power from either mains or battery through a power selection circuit, reducing component count and system complexity while ensuring reliable operation in both normal and emergency conditions
2Reliability
If separate drivers are used for mains and battery supplies, then the LED lamp unit can be driven in both normal and emergency modes, but the cost increases
Solution Approach 1:
The LED driver is designed to perform multiple functions by accepting different input voltage ranges. The driver can operate with mains voltage (170-260V AC) during normal mode and battery voltage (18-36V DC) during emergency mode, eliminating the need for separate drivers while maintaining full emergency lighting functionality
Solution Approach 2:
The patent combines the mains driver and emergency driver functions into a single integrated LED driver unit. This unified driver receives power from either mains or battery through a power selection circuit, reducing component count and system complexity while ensuring reliable operation in both normal and emergency conditions
3Reliability
If a separate emergency driver is added, then the LED lamp unit can operate in emergency mode, but the integration into existing lighting systems becomes difficult
Solution Approach 1:
The LED driver is designed to perform multiple functions by accepting different input voltage ranges. The driver can operate with mains voltage (170-260V AC) during normal mode and battery voltage (18-36V DC) during emergency mode, eliminating the need for separate drivers while maintaining full emergency lighting functionality
Solution Approach 2:
The patent introduces a power selection circuit as an intermediary component that manages power input from either mains or battery sources. This circuit acts as a mediator between the power sources and the LED driver, enabling seamless integration of emergency functionality into existing lighting systems without requiring separate driver circuits
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables seamless operation in both normal and emergency modes using existing LED drivers without modifications, reducing costs and simplifying integration of emergency functionality into existing lighting systems, while ensuring reliable and efficient power delivery.
Implementation Method 1
an emergency mode converter, such as an isolated boost converter, which provides a DC output at a normal mains level
Data Source
Figure 1
AI summary
A power supply system for illuminating an LED lamp unit 5, having a normal mode of operation in which a mains input 4 of a driver 3 of the LED lamp unit is supplied by mains power 1, and an emergency mode of operation, in which the LED lamp unit is supplied by a charge storage device 19, is disclosed. The system includes an emergency mode converter 21 operable to step-up the voltage from the charge storage device and to supply the mains driver input for illuminating the LED lamp unit.