LED Light Source Board Thermal Management via Segmented Constant Current Circuits
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing LED drive circuits for vehicles have a high number of parts due to separate housings for LED boards and constant current circuits, which increases heat generation and makes integration challenging.
Innovation Solution
A light emitting device with a housing that integrates multiple light source units, constant current circuits, and a control unit, where LEDs of the same type are connected in series and constant current circuits are dispersed across multiple boards, reducing the number of parts and heat generation by equalizing temperature rise across units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the constant current board and LED board are integrated into one housing to reduce the number of parts, then the number of parts is reduced, but the temperature rise of the light source board increases due to heat from the constant current circuit
Solution Approach 1:
The patent divides the constant current circuits into separate modules, with each light source unit having its own constant current circuit. This segmentation allows heat to be distributed across multiple independent units rather than concentrated in one location, reducing the temperature rise of any single light source board while maintaining the integrated housing structure.
Solution Approach 2:
The patent implements different thermal management strategies for different parts of the system. The constant current circuits are positioned and designed to manage their heat generation locally, allowing the light source boards to operate in a cooler environment while the constant current boards handle the heat dissipation in separate zones within the same housing.
2Device complexity
If multiple constant current circuits are mounted on a single constant current board, then the number of parts is reduced, but the heat generation and temperature rise concentrate on that board
Solution Approach 1:
Instead of concentrating multiple constant current circuits on a single board, the patent segments them so that each light source unit has its own dedicated constant current circuit on its own board. This distributes the heat generation across multiple separate boards, preventing heat concentration while still maintaining a compact integrated structure within the housing.
3Temperature
If LED boards and constant current circuits are provided as separate parts in separate housings, then heat management is easier, but the number of parts and assembly complexity increases
Solution Approach 1:
The patent merges multiple light source units, each comprising a light source board and its corresponding constant current board, into a single integrated housing. This combining approach reduces the total number of housings and parts while maintaining effective heat management through the distributed architecture of separate light source units within the unified housing structure.
Data Source
AI summary
A light emitting device capable of reducing the number of parts while suppressing temperature rise of a light source board. Each of a plurality of LED units has an LED boards, and constant current boards. LED board is equipped with a blue LED, a red LED, and a green LED, LED board is equipped with a blue LED, a red LED, and a green LED. A constant board is equipped with a constant current circuit supplying constant current to the red LEDs and having the largest driving current. The constant current board is equipped with constant current circuits supplying constant current to the remaining blue LEDs, and the green LEDs.