Vehicle Lamp Drive Modules for Thermal Management
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Vehicle lamps for commercial vehicles face challenges in heat management due to the integration of high beam and low beam light sources, which require concurrent illumination, and often need a fan-less design for long-term reliability.
Innovation Solution
A vehicle lamp design incorporating separate drive modules for low and high beam semiconductor light-emitting elements, with feedback-controlled DC/DC converters and dimming mechanisms to manage heat and ensure reliable operation without fans.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If high beam and low beam light sources are integrated in a single vehicle lamp, then design diversity and ease of manufacture are improved, but heat generation increases during high beam illumination
Solution Approach 1:
The patent divides the lighting system into separate drive modules for high beam and low beam, allowing independent control of each light source. This segmentation enables the system to manage heat generation by controlling which modules operate concurrently, resolving the contradiction between integrated design and heat management.
Solution Approach 2:
The patent employs feedback control to dynamically adjust drive current parameters based on operating conditions. By monitoring temperature and adjusting current levels, the system maintains optimal performance while preventing excessive heat accumulation during high beam operation.
2Illumination intensity
If both high beam and low beam light sources operate concurrently to satisfy light distribution requirements, then light distribution performance is improved, but heat generation increases
Solution Approach 1:
The patent implements dynamic control where the drive modules can independently adjust their operation based on real-time conditions. During high beam illumination, the system dynamically manages the low beam output to balance light distribution requirements with heat generation constraints, allowing flexible adaptation to different operating scenarios.
Solution Approach 2:
The patent incorporates feedback control mechanisms that monitor temperature and illumination levels, then adjust drive currents accordingly. This feedback loop enables the system to maintain required light distribution while preventing excessive heat accumulation by reducing power to one or both light sources when temperature thresholds are approached.
3Reliability
If a fan-less design is implemented for long-term reliability, then reliability is improved, but heat dissipation capability deteriorates
Solution Approach 1:
The patent designs the system to manage its own thermal characteristics through intelligent control algorithms. By monitoring temperature sensors and automatically adjusting drive currents, the lighting system self-regulates heat generation without requiring external active cooling components, achieving reliable operation in a fan-less design.
Solution Approach 2:
The patent implements preventive thermal management by monitoring temperature trends and reducing power output before critical temperature thresholds are reached. This preliminary action prevents excessive heat accumulation that would compromise reliability, allowing the system to operate safely without active cooling mechanisms.
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 effectively reduces heat generation during high beam illumination while maintaining light distribution requirements, ensuring long-term reliability and eliminating the need for visual telltales.
Implementation Method 1
a first DC/DC converter structured to supply a first drive current to the first semiconductor light-emitting element
Implementation Method 2
a first semiconductor light-emitting element for low beam illumination, and a second semiconductor light-emitting element for high beam illumination
Data Source
Figure 1
Figure 2
Figure 3A~3B
AI summary
A light-emitting unit 110 includes a first semiconductor light-emitting element 112 for low beam illumination, and a second semiconductor light-emitting element 114 for high beam illumination. A first drive module 120 is structured to drive the first semiconductor light-emitting element 112. A second drive module 140 is structured to drive the second semiconductor light-emitting element 114. A first converter controller 124 is structured to feedback control a first DC/DC converter 122, so as to bring a first drive current IDRVL generated by the first DC/DC converter 122 close to a first reference level IREFL1. The second drive module 140 is structured to transmit a dimming instruction signal DIM to the first drive module 120, in response to lighting instruction for the high beam illumination. The first drive module 120 is structured to reduce the first drive current IDRVL to a second reference level IREFL2 lower than the first reference level IREFL1, in response to the dimming instruction signal DIM.