Automotive Headlamp Liquid Cooling Circuit for LED Heat Dissipation
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Solution Overview
Problem
LEDs in automotive headlamp assemblies generate significant heat during operation, leading to potential degradation and efficiency decline if not efficiently dissipated, affecting light color and performance.
Innovation Solution
A partially vertically arranged liquid cooling circuit within the headlamp assembly, comprising cold plates thermally coupled to the LEDs and a radiator, with tubes circulating a fluid to effectively dissipate heat, forming a self-stabilizing closed-loop system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If LEDs are used as light sources in automotive headlamp assemblies, then efficiency and operating life are improved, but significant heat is generated that can cause degradation and failure
Solution Approach 1:
The patent converts the harmful heat generated by LEDs into a manageable thermal flow by implementing a liquid cooling circuit that captures and redirects the heat away from the LED components. The cooling circuit includes cold plates thermally coupled to LED heat sources, radiators for heat dissipation, and fluid circulation paths that transform the problematic heat into a controlled thermal management system, thereby extending LED operating life while maintaining efficiency.
2Temperature
If traditional cooling methods are used, then heat dissipation is provided, but the cooling effectiveness is insufficient for high-power LEDs
Solution Approach 1:
The patent employs a liquid cooling system where coolant fluid circulates through closed-loop channels including cold plates and radiators. The hydraulic flow of coolant through the cooling circuit provides efficient heat transfer from LED sources through conduction and convection, achieving reliable temperature control that passive air cooling cannot provide for high-power LED applications.
3Temperature
If a cooling circuit is added to the headlamp assembly, then heat dissipation is improved, but device complexity increases
Solution Approach 1:
The patent integrates the cooling circuit components (cold plates, radiators, fluid channels) directly into the headlamp assembly structure itself, merging the lighting and cooling functions into a unified design. The cold plates are thermally coupled to LED mounting surfaces, and the fluid circulation paths are incorporated within the headlamp housing, eliminating the need for separate external cooling systems and reducing overall 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 cooling system maintains LED temperatures within safe limits, enhancing their efficiency and longevity by efficiently dissipating heat away from the LEDs and their electronics.
Implementation Method 1
cold plates thermally coupled to the light source
Implementation Method 2
at least one radiator...circulate a fluid through the cooling circuit
Implementation Method 3
at least one radiator...circulate a fluid through the cooling circuit
Implementation Method 4
Tubes are configured to circulate a fluid through the cooling circuit...heat is conducted to the fluid
Data Source
AI summary
An automotive headlamp assembly having a closed-loop cooling circuit. The headlamp assembly includes a housing cooperating with a transparent lens cover to define a chamber. At least one light source is located within the chamber. The cooling circuit has at least one cold plate thermally coupled to the light source. A radiator is fluidly coupled to the cold plate by a plurality of tubes. The tubes are oriented at least partially upwardly and configured to circulate a fluid through the cooling circuit as a result of heating and cooling of the fluid therein.