Emergency Lighting Power Control for Constant Load Operation
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Solution Overview
Problem
Existing emergency lighting systems are costly due to the need for specialized fixtures and variable operation times based on different general lighting loads, which are not efficiently managed by current battery capacity systems.
Innovation Solution
An emergency lighting system comprising a battery supplying module, a DC transforming module, and a power controlling module that adjusts output current to maintain a constant power for general lighting loads during emergencies, using a voltage sampling circuit and operational amplifiers to generate control signals for the DC transforming module, allowing operation without changing existing general lighting fixtures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If specialized emergency lighting fixtures are used, then emergency lighting reliability is improved, but system cost increases and adaptability to different general lighting loads decreases
Solution Approach 1:
The emergency lighting system is designed to work with multiple types of general lighting loads (LED, fluorescent, incandescent) by detecting their rated voltages and adjusting output current accordingly. The system can replace or supplement existing lighting fixtures without requiring specialized emergency lighting hardware, achieving multi-functionality and broad adaptability across different lighting scenarios.
2Duration of action of moving object
If battery capacity is increased to extend operation time, then duration of emergency lighting is improved, but system cost and device complexity increase
Solution Approach 1:
The system dynamically adjusts its output current based on the detected rated voltage of the connected lighting load. By implementing real-time voltage detection and adaptive current control, the system optimizes power consumption and extends battery operation time without requiring larger battery capacity, thereby avoiding increased device complexity and cost.
3Power
If output current is increased to maintain constant power for high voltage loads, then power delivery capability is improved, but battery capacity requirements and energy consumption increase
Solution Approach 1:
The system implements feedback control by continuously detecting the rated voltage of the connected lighting load and adjusting the output current accordingly. When a high voltage load is detected, the system automatically reduces the output current to maintain constant power delivery, preventing excessive energy consumption and optimizing battery usage efficiency.
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
This solution ensures a constant power output for different lighting loads with varying rated voltages, extending operation time based on battery capacity and reducing overall installation costs by eliminating the need for specialized emergency lighting fixtures.
Implementation Method 1
the voltage sampling circuit for sampling the rated voltage of the general lighting load
Implementation Method 2
the first operational amplifier for feeding the rated voltage sampled by the voltage sampling circuit to an inverting terminal of the second operational amplifier, and the second operational amplifier for generating the control signal
Implementation Method 3
the DC transforming module for supplying power to a general lighting load; the DC transforming module for altering an output current provided by the battery supplying module
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
An emergency lighting system and a method of providing emergency lighting. A DC transforming module (4) supplies power to a general lighting load (6). A battery supplying module (2) supplies power to the DC transforming module (4) when an emergency lighting condition is met. A power controlling module (5) obtains a rated voltage of the general lighting load (6), generates a control signal related to the obtained rated voltage using the obtained rated voltage and a predetermined power, and provides the generated control signal to the DC transforming module (4). The DC transforming module (4) alters the output current provided by the battery supplying module (2) using the control signal provided by the power controlling module (5) and provides an altered output current to the general lighting load (6) for operating the general lighting load (6) at substantially the predetermined power. The predetermined power is a constant value.