ESD Diverting Arrangement for Automotive LED Interconnects
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Solution Overview
Problem
High-power diode lighting arrangements, especially in automotive applications, are vulnerable to electrostatic discharge (ESD) damage due to exposed interconnects between light-emitting diodes, which can lead to costly failures when traditional ESD protection methods are complex and expensive to implement.
Innovation Solution
A diode lighting arrangement with a supplementary ESD diverting arrangement placed in physical proximity to interconnects between light-emitting diodes, diverting electrostatic discharge to a region of lower potential, such as ground, thereby preventing damage from high current surges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional ESD protection circuits with zener diodes are used, then electrostatic discharge protection is provided, but exposed interconnects between light-emitting diodes remain vulnerable to ESD damage
Solution Approach 1:
A conductive filler material is introduced as an intermediary substance between the light-emitting diodes and the substrate. This filler material creates a conductive path that diverts electrostatic discharge away from the vulnerable interconnects, protecting the LEDs without requiring additional ESD protection circuitry. The filler acts as a mediator that safely channels the ESD current through the substrate to ground.
2Reliability
If the entire interior surface of the housing is coated with transparent conductive material, then electrostatic discharge protection is achieved, but manufacturing cost increases significantly
Solution Approach 1:
Instead of coating the entire housing interior surface with expensive transparent conductive material, the invention applies conductive filler material only in the specific region between the light-emitting diodes and the substrate. This localized application provides ESD protection exactly where it is needed (at the vulnerable interconnect points) while minimizing material costs and simplifying the manufacturing process.
3Reliability
If a flat metal strip is used to connect the housing to ground, then electrostatic discharge is diverted, but the solution becomes complex and costly in automotive applications
Solution Approach 1:
The invention merges the ESD protection function with the existing substrate structure by incorporating conductive filler material directly into the space between the LEDs and substrate. This integration eliminates the need for separate grounding circuitry, metal strips, or additional components. The ESD protection becomes an inherent part of the lighting arrangement's construction, simplifying the overall system and reducing complexity in automotive applications.
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
Effectively shields light-emitting diodes from electrostatic discharge, reducing the risk of damage and eliminating the need for additional grounding circuitry in other components, making the solution economical and reliable.
Implementation Method 1
A diode lighting arrangement with a supplementary ESD diverting arrangement placed in physical proximity to interconnects between light-emitting diodes, diverting electrostatic discharge to a region of lower potential
Data Source
AI summary
The invention describes a diode lighting arrangement (1A,1B,1C) comprising a light-emitting diode arrangement (1,2) comprising at least two exposed serially connected light-emitting diodes (1) connected in parallel with an electrostatic discharge protection diode arrangement (2); and an electrostatic discharge diverting arrangement (4,50) extending in physical proximity to an interconnect (10) between adjacent light-emitting diodes (1), which diverting arrangement (4,50) is realized to divert electrostatic discharge (S2) from the interconnect (10) to a region of low potential (21,22, GND). The invention further describes an automotive lighting assembly (3A,3B) comprising such a diode lighting arrangement (1A,1B,1C). The invention also describes a method of manufacturing a diode lighting arrangement (1A,1B,1C) which method comprises the steps of serially connecting a light-emitting diode arrangement (1,2) comprising at least two exposed serially connected light-emitting diodes (1) in parallel with an electrostatic discharge protection diode arrangement (2); and arranging an electrostatic discharge diverting arrangement (4,50,60) to extend in physical proximity to at least one interconnect (10) between adjacent light-emitting diodes (1), which diverting arrangement (4,50) is realized to divert electrostatic discharge (S2) from the interconnect (10) to a region of low potential (21,22, GND).