Explosion-proof LED Luminaire with Inductive Power Transmission
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Solution Overview
Problem
Existing explosion-proof LED luminaires face performance limitations due to current and voltage limitations in safety barriers and reduced light output from encapsulation, which complicates design and increases costs with complex and expensive feedthroughs.
Innovation Solution
A contactless power transmission device using inductive power transmission between LEDs and a ballast, allowing for variable LED arrangements without direct connections, and individual housings with pressure-proof encapsulation for improved design flexibility and light control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If individual LEDs are powered via safety barriers with current and voltage limitation, then explosion protection is achieved, but luminaire performance is limited
Solution Approach 1:
The luminaire is divided into multiple independently encapsulated LED modules, each with its own individual housing. This segmentation allows each module to be independently protected while enabling the overall system to achieve higher performance through parallel operation without being constrained by single-point safety barriers.
Solution Approach 2:
An optical coupling medium or waveguide structure acts as an intermediary between multiple LED light sources and the final light output. This allows energy from multiple high-power LEDs to be combined and transmitted efficiently without requiring each LED to be individually limited by safety barriers, thus resolving the contradiction between protection and performance.
2Object-affected harmful factors
If individual lamps are configured with ignition protection type Ex-m encapsulation, then electric arc prevention is achieved, but light output of each lamp is reduced
Solution Approach 1:
Multiple LED modules with individual Ex-m encapsulation are optically combined or arranged in parallel configurations. The cumulative light output of multiple modules compensates for the reduced output of individual encapsulated lamps, while maintaining the electric arc prevention benefits of Ex-m protection for each module.
3Reliability
If flameproof feedthroughs are used for connection lines to LEDs, then explosion protection is maintained, but device complexity and cost increase
Solution Approach 1:
The connection lines are extracted from the explosive atmosphere by routing them through inherently safe power supply units located outside the explosion-prone environment. The power supply units use isolated power transmission (such as optical coupling or magnetic coupling) to deliver power without requiring complex flameproof feedthroughs, thereby reducing device complexity while maintaining protection.
4Ease of manufacture
If LEDs are arranged in fixed configurations, then manufacturing simplicity is maintained, but design flexibility and adaptability are reduced
Solution Approach 1:
The luminaire is segmented into standardized, modular LED modules that can be independently manufactured and then assembled in various configurations. This modular approach maintains manufacturing simplicity for each module while enabling great flexibility in overall luminaire design and LED arrangement to meet different application requirements.
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 efficient power supply and control of LEDs without specific protection types, simplifying design, reducing costs, and enhancing light output and explosion protection, with flexible LED arrangements and easy exchangeability.
Implementation Method 1
A contactless power transmission device using inductive power transmission between LEDs and a ballast
Implementation Method 2
individual housings with pressure-proof encapsulation for improved design flexibility and light control
Data Source
AI summary
An explosion-proof luminaire comprises a plurality of light-emitting diodes. These are assigned to a ballast for electrical power supply. A contactless power transmission device is formed between at least a group of LEDs and the ballast. This yields an explosion-proof luminaire which is simplified and improved in terms of structure and light output while permitting many possible arrangements of the LEDs in the corresponding luminaire at the same time.