LED Heat Sink Base Thermal Management
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Solution Overview
Problem
Brighter LEDs require higher currents, leading to increased heat production, which reduces efficiency and causes undesirable color shifts due to elevated phosphor temperatures, limiting their effectiveness in applications like flashlights and general illumination.
Innovation Solution
A heat sink base with a heat conductive member and attachable heat sink fins that facilitate heat dissipation from LED dice and phosphors, maintaining lower temperatures and enhancing thermal conductivity to allow higher current usage without efficiency loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If higher current is used to increase LED brightness, then illumination intensity is improved, but heat production increases causing efficiency loss and color shifts
Solution Approach 1:
The patent converts the harmful heat generated by high-current LED operation into a manageable thermal conduction problem. By integrating a heat conductive member directly into the LED assembly base, the harmful heat energy is systematically conducted away from the LED junction, allowing high current operation to proceed efficiently without the usual penalty of heat-induced performance degradation.
2Illumination intensity
If higher current is used to increase LED brightness, then illumination intensity is improved, but color stability deteriorates due to phosphor temperature elevation
Solution Approach 1:
The patent addresses color instability by converting the harmful thermal effect on phosphors into a controlled heat conduction pathway. The heat conductive member, thermally coupled to the LED base, actively draws heat away from the phosphor layer, maintaining stable phosphor temperature and thus stable color output even during high-current operation that would otherwise cause significant color shifts.
Solution Approach 2:
The heat conductive member acts as a thermal intermediary between the LED junction/phosphor and the external environment. This intermediary structure provides a dedicated heat evacuation pathway that isolates the phosphor from direct thermal coupling with the high-current LED operation, thereby mediating the thermal stress and preserving color stability.
3Temperature
If heat dissipation structure is added to manage thermal effects, then temperature control is improved, but device complexity increases
Solution Approach 1:
The patent merges the heat dissipation function with the existing LED assembly base structure. Rather than adding a separate, complex heat sink assembly, the heat conductive member is integrated directly into the base, combining structural support and thermal management functions into a single unified component. This integration approach provides effective temperature control while minimizing increases in device 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
The solution enables brighter LEDs with reliable color stability by efficiently managing heat, allowing higher current usage while maintaining phosphor efficiency and preventing color shifts, thus improving performance in applications such as flashlights and displays.
Implementation Method 1
a heat sink base, at least one LED die attached to the heat sink base, and a heat sink attached the heat sink base
Data Source
AI summary
An LED assembly can include a heat sink base, at least one LED die attached to the heat sink base, and a lens. One or more layers of phosphor can be formed upon the lens. A heat sink, such as a finned heat sink, can attach the heat sink base to the lens. Heat from the LED die can flow through the heat sink base to the heat sink, from which the heat can be dissipated. Similarly, heat from phosphors can flow through the lens to the heat sink, from which the heat can be dissipated. By removing heat from the LED die, more current can be used to drive the LED die, thus providing brighter light. By removing heat from the phosphors, desired colors can be more reliably provided.