LED Light Fixture Anisotropic Heat Conduction Design
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Solution Overview
Problem
LED light fixtures face challenges in achieving compactness, ease of installation, and servicing while maintaining excellent heat dissipation and light output, with the added constraint of controlling product cost in high-volume applications.
Innovation Solution
The design incorporates a heat-sink body with a circuit-board mounting surface, an LED circuit board in thermal contact, and an optical aperture configuration where the non-LED-populated area extends beyond the optical aperture, facilitating anisotropic heat conduction and efficient heat dissipation, along with a low-profile base plate and movable cover for thermal communication and easy access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the circuit board size is reduced to achieve compactness, then the fixture size is reduced, but heat dissipation capability deteriorates
Solution Approach 1:
The patent extends the circuit board in the lateral direction beyond the optical aperture, utilizing the horizontal plane rather than increasing vertical thickness. This allows heat dissipation area to increase without increasing the overall fixture volume, resolving the contradiction between compactness and heat dissipation capability.
Solution Approach 2:
The circuit board is segmented into LED-populated area and non-LED-populated area, with the non-LED area extending beyond the optical aperture specifically for heat dissipation. This segmentation allows different regions to serve different functions: light emission in the populated area and thermal management in the extended non-populated area.
2Temperature
If the circuit board is made larger to improve heat dissipation, then heat dissipation capability is improved, but the fixture becomes less compact and more difficult to install
Solution Approach 1:
Instead of increasing circuit board area by expanding in all dimensions, the patent utilizes the lateral dimension beyond the optical aperture. This provides effective heat dissipation area while maintaining a compact profile that fits within standard installation openings, preserving ease of installation.
3Temperature
If the non-LED-populated area is extended beyond the optical aperture, then heat dissipation is improved through anisotropic conduction, but the device complexity increases
Solution Approach 1:
The non-LED-populated area of the circuit board serves multiple functions: it provides electrical connection pathways and simultaneously acts as a heat dissipation region that extends beyond the optical aperture. This multi-functionality reduces overall device complexity by combining multiple roles into a single structural element.
Solution Approach 2:
The patent merges the electrical circuit functions and thermal management functions into the same circuit board structure. The non-LED-populated area performs both electrical routing and heat dissipation, eliminating the need for separate thermal management components and reducing configurational complexity.
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 configuration enhances thermal efficiency, reduces LED temperatures, increases lumen output, and allows for higher drive current without increasing manufacturing costs, while maintaining a compact and easily serviceable design suitable for applications like gasoline station canopies.
Implementation Method 1
The circuit board and optical aperture being configured such that the non-LED-populated area extends beyond the optical aperture... takes advantage of the anisotropic nature of heat conduction—the fact that heat conduction laterally within the circuit board is greater than heat conduction from the circuit board to the heat-sink body
Implementation Method 2
an LED circuit board affixed in thermal-contact relationship to the circuit-board mounting surface... heat conduction from the circuit board to the heat-sink body
Data Source
AI summary
An LED light fixture includes a heat-sink body having a circuit-board mounting surface and a circuit board in thermal-contact relationship to the circuit-board mounting surface. The circuit board has an LED-populated area and a surrounding non-LED-populated area such that lateral heat conduction within the circuit board is greater than heat conduction from the circuit board to the circuit-board mounting surface. The fixture may be a low-profile LED light fixture including a base plate which has a substantially planar back surface, a front surface and heat-dissipating surfaces extending forward from the front surface. An LED circuit board and at least one LED power-circuitry unit, which are secured with respect to the front surface adjacent to the heat-dissipating surfaces, do not extend behind the back surface of the base plate.