Solid State Relay Internal Heat Sink Design
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Solution Overview
Problem
Solid state relays face challenges in efficiently dissipating heat generated when switching currents in the 10-20+ amp range, as existing heat sinks either lack sufficient thermal conductivity or structural strength, and require exposed metallic surfaces for attachment, which is not suitable for hazardous locations.
Innovation Solution
A rail mountable solid state relay with internal heat sinks made from low-cost, easily manufactured materials with high thermal conductivity, such as a combination of graphite and aluminum, attached to a printed wiring board using a thermally conductive adhesive, and housed in a thermally conductive potting material within an insulating relay housing, allowing for effective heat dissipation without exposed metallic surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If large external heat sinks are attached to the relay housing, then heat dissipation is improved, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent combines the heat sink function with the relay housing itself by incorporating a thermally conductive material (aluminum or aluminum alloy) into the housing structure. The housing serves dual purposes: mechanical enclosure and heat dissipation, eliminating the need for separate external heat sinks and reducing overall device complexity
Solution Approach 2:
The relay housing is designed to perform multiple functions simultaneously: providing mechanical protection for internal components and serving as a heat sink for thermal management. This multi-functional design integrates the housing as both structural enclosure and thermal management component
2Temperature
If the relay housing is attached directly to a metallic enclosure, then heat dissipation is improved, but exposed metallic surfaces create safety hazards in hazardous locations
Solution Approach 1:
The patent changes the material parameter of the housing from conventional non-thermally conductive materials to thermally conductive materials (aluminum or aluminum alloy). This material parameter change enables the housing to function as a heat sink while allowing the use of non-metallic or inherently safe materials that can be used in hazardous locations without exposed conductive surfaces
3Temperature
If thermally conductive materials are used for the housing, then heat dissipation is improved, but the structural strength and manufacturing ease may be compromised
Solution Approach 1:
The patent employs aluminum or aluminum alloy for the housing, which serves as a composite solution providing both the required thermal conductivity for heat dissipation and sufficient mechanical strength for structural integrity. The aluminum material simultaneously satisfies thermal management requirements and mechanical durability requirements
4Temperature
If exposed metallic surfaces are used for heat sink attachment, then heat dissipation is improved, but the ease of operation and safety in hazardous locations is reduced
Solution Approach 1:
The patent merges the heat sink attachment surface with the housing itself by making the housing material thermally conductive. This eliminates the need for separate attachment surfaces and simplifies installation, allowing the housing to directly interface with heat-generating components while maintaining safety for hazardous location operations
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 enables efficient heat dissipation and structural stability, allowing the solid state relay to be safely installed in hazardous locations without the need for expensive explosion-proof enclosures, while maintaining operational safety and reliability.
Implementation Method 1
attached directly to them with a thermal conductive adhesive
Implementation Method 2
having a high thermal conductivity index
Implementation Method 3
The housing is potted with a thermally conductive potting material
Data Source
AI summary
A solid state relay having an internal heat sink for dissipating heat produced by a solid state switching device. The relay being enclosed within a nonmetallic housing and mountable on a DIN type rail system.