Hazardous Location LED Fixture Thermal Management Without Heat Sinks

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Conventional high-output LED lighting fixtures for hazardous locations require complex and costly heat sink structures to manage peak operating temperatures, which complicates assembly and increases economic costs.

Innovation Solution

The design of a simplified LED lighting fixture assembly that eliminates the need for heat sinks by using dual LED modules spaced apart and an elevated LED driver, which effectively dissipates heat through the enclosure and other components without the use of heat sinks.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Temperature

If heat sinks are used to manage peak operating temperatures, then temperature control is improved, but device complexity and manufacturing cost increase

Engineering Contradiction:

Improvepeak operating temperatureVSAvoidassembly complexity

Core Design Contradiction:

TemperatureVSDevice complexity

Solution Approach 1:

The patent removes the heat sink component entirely from the LED lighting fixture assembly. Instead of adding thermal management hardware, the design relies on the natural thermal properties of existing components (enclosure, mounting structure) to dissipate heat, thereby eliminating assembly steps and reducing complexity while still managing peak operating temperatures.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The enclosure and structural components serve dual functions: providing mechanical support and housing while simultaneously acting as thermal pathways for heat dissipation. This eliminates the need for dedicated heat sink components, reducing overall device complexity while maintaining effective temperature control.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Temperature

If heat sinks are used to manage peak operating temperatures, then temperature control is improved, but manufacturing cost increases

Engineering Contradiction:

Improvepeak operating temperatureVSAvoidmanufacturing cost

Core Design Contradiction:

TemperatureVSEase of manufacture

Solution Approach 1:

By extracting the heat sink component from the assembly, the patent eliminates associated manufacturing costs for purchasing, fabricating, or procuring heat sinks. The existing enclosure and structural elements are utilized for thermal management, reducing bill of materials costs and simplifying the manufacturing bill.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

Existing structural components are designed to serve both mechanical and thermal functions, eliminating the need for separate heat sink components. This reduces manufacturing costs by reducing the total number of parts that need to be manufactured, procured, and assembled.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Illumination intensity

If high output LEDs are used to increase illumination intensity, then lighting output is improved, but heat generation increases requiring thermal management

Engineering Contradiction:

Improvelighting outputVSAvoidoperating temperature

Core Design Contradiction:

Illumination intensityVSTemperature

Solution Approach 1:

The LED modules and enclosure are designed to work together where the enclosure's natural thermal conductivity and surface area provide sufficient heat dissipation for the LED modules' output. The system serves its own thermal management needs through properly designed mounting structures and spacing, eliminating the need for additional active cooling or heat sink components.

Inventive Principle:

Principle #25Self-service

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 achieves thermal stability and maintains the effective surface temperature of the fixture below the maximum allowable temperature threshold for hazardous locations, reducing manufacturing costs and assembly complexity.

Implementation Method 1

effectively dissipates heat through the enclosure and other components

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Implementation Method 2

dissipates heat through the enclosure and other components

Methodology Applied

Scientific EffectThermal radiation: Thermal Radiation

Data Source

PatentUS12326250B2Thermally managed hazardous location LED light fixture, assembly and methods without utilizing heat sinks

Publication Date: 2025.06.10 EATON INTELLIGENT POWER LTD

AI summary

An LED light fixture for a hazardous location includes an axially elongated enclosure, a first axially elongated printed circuit board with light emitting diode (LED) components mounted in the axially elongated enclosure, a second axially elongated printed circuit board with LED components mounted in the axially elongated enclosure, and an LED driver module mounted in the enclosure that operates the circuit boards. The LED driver module is (1) positioned laterally in a horizontal direction in the axially elongated enclosure at a location between the first axially elongated printed circuit board and the second axially elongated printed circuit board, and (2) elevated in a vertical direction in the axially elongated enclosure relative to the first and second axially elongated printed circuit boards.