Low Voltage LED Fixture with External Battery for Zone 1 Safety
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing LED lighting systems operate at high voltages, making them difficult to maintain and hazardous in Zone 1 environments, with complex designs and large sizes, and lack energy efficiency and cost-effectiveness.
Innovation Solution
A low voltage LED lighting fixture with a Switch-mode Power Supply (SMPS) unit, current sensing, and dimming control, using a low voltage battery pack for emergency backup, allowing for dimming and simple assembly, and compliance with Zone 1 safety standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If high voltage is used in LED lighting systems, then power delivery capability is improved, but safety and ease of maintenance deteriorate
Solution Approach 1:
The patent changes the voltage parameter from high voltage to low voltage operation. The LED lighting system is designed to operate at low voltage levels, eliminating the need for high voltage power supply while maintaining adequate power delivery through optimized current control and LED array configuration. This parameter change directly resolves the safety concern while preserving functional performance.
2Reliability
If battery pack and BMM are integrated within the fixture, then emergency backup function is improved, but device complexity and hazard risk increase
Solution Approach 1:
The patent extracts the battery pack and Battery Management Module from the fixture enclosure and relocates them to an external position. This separation maintains the emergency backup functionality while significantly reducing the complexity and hazard risk within the fixture itself. The external battery configuration simplifies the fixture design and reduces maintenance complexity.
3Reliability
If conventional emergency lighting fixtures are designed with integrated battery and BMM, then emergency functionality is improved, but size and design complexity increase
Solution Approach 1:
The patent removes the battery pack and BMM from the fixture volume and positions them externally. This extraction allows the fixture itself to be compact while the emergency backup components occupy separate space. The fixture maintains full emergency lighting functionality without the volume penalty of integrated battery housing.
4Power
If high voltage operation is used, then power supply capability is improved, but ease of operation and maintenance deteriorate
Solution Approach 1:
The patent changes the operating voltage parameter to low voltage, which inherently improves safety and ease of maintenance. The system achieves adequate power supply capability through optimized low voltage current control, LED driver circuitry, and efficient power management, eliminating the maintenance difficulties associated with high voltage components.
Solution Approach 2:
By extracting the battery and power management components from the fixture, the patent simplifies maintenance procedures. Technicians can service the fixture without handling integrated battery packs or complex power management circuits, significantly improving ease of operation and maintenance.
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
The solution results in a smaller, energy-efficient, cost-effective, and safer LED lighting system that can be easily assembled and operated in hazardous environments with reduced risk, enabling dimming control and efficient emergency power supply.
Implementation Method 1
The SMPS unit is configured to receive an input DC power from a DC power supply unit and is further configured to supply an adequate DC power to drive the LED array
Implementation Method 2
The current sensing unit is configured to continuously sense the output current of the SMPS unit and is further configured to generate a digital sensed current signal
Implementation Method 3
The fixture includes at least one array of LEDs
Implementation Method 4
uses a low voltage battery pack for emergency backup
Data Source
AI summary
A low voltage lighting system including a fixture (200) having an array of LEDs (204) and an LED driver circuit (202). The LED driver circuit (202) includes a Switch-mode Power Supply (SMPS) unit (206), a current sensing unit (210), a control unit (208) and a dimming input level shifting and signal conditioning unit (212). The SMPS unit (206) produces an adequate DC power (+VLED, −VLED) for driving the LEDs (204). The control unit (208) receives a sensed current signal from the current sensing unit (210) and controls the SMPS unit (206) to maintain the output current within a pre-determined range. The control unit (208) receives a dimming signal from the dimming unit (212) or an emergency signal from a supply unit (104) to alter the output power of the SMPS unit (206) from normal mode to dimming mode or emergency mode respectively.