Light Module Voltage Regulation for Automotive LED Bridging
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Solution Overview
Problem
Existing light modules with series connections of semiconductor light sources face issues with sudden voltage jumps during bridging, which can damage unbridged sources and require specific adjustments for different control devices, leading to potential errors in fault detection.
Innovation Solution
Incorporating a low-drop voltage regulator in series with the semiconductor light sources, which operates based on the output voltage of the control unit, allowing for smooth voltage regulation and fault detection without damaging the unbridged sources, and enabling operation with various control devices without special adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If semiconductor light sources are bridged individually in series connection, then lighting effects and animations can be generated, but sudden voltage jumps occur that can damage unbridged light sources
Solution Approach 1:
A decoupling capacitor is introduced as an intermediary element between the control unit and the semiconductor light sources. This capacitor acts as a buffer that absorbs sudden voltage jumps when light sources are bridged, preventing direct voltage spikes from reaching and damaging the light sources while still allowing the control unit to generate various lighting effects.
Solution Approach 2:
The decoupling capacitor provides beforehand cushioning by being pre-positioned in the circuit to absorb potential voltage spikes before they can reach the semiconductor light sources. This protective measure is in place before any bridging occurs, cushioning the system against harmful voltage jumps.
2Reliability
If control units are adapted to specific voltage behaviors, then damage from voltage jumps can be prevented, but the device requires specific adjustments for each control unit
Solution Approach 1:
The decoupling capacitor enables the system to self-regulate voltage spikes automatically without requiring external adaptation of the control unit. The capacitor inherently absorbs voltage jumps through its electrical properties, allowing the same control unit to work reliably with different light module configurations without needing specific adjustments.
Solution Approach 2:
By incorporating the decoupling capacitor, the light module achieves universality in its operation with different control units. The capacitor serves as a universal protective element that works with any control unit's voltage behavior, eliminating the need for control unit-specific adaptations while maintaining reliable damage prevention.
3Adaptability or versatility
If multiple semiconductor light sources are bridged, then lighting effects are enhanced, but the voltage drop may fall below detection thresholds causing false fault detection
Solution Approach 1:
The decoupling capacitor acts as an intermediary that stabilizes the voltage supply to the series circuit of semiconductor light sources. By filtering voltage fluctuations and maintaining stable voltage levels, the capacitor ensures that the voltage drop across the light sources remains within detectable ranges even when multiple sources are bridged, preventing false fault detection.
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 prevents damage from sudden current surges and allows for accurate fault detection and reporting, ensuring reliable operation across different control devices and maintaining minimal voltage drops even with multiple bridged sources.
Implementation Method 1
a low-dropout voltage regulator, which is connected in series with the series connection of the semiconductor light sources and is operated on the basis of an output voltage of the control unit
Data Source
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AI summary
A light module (106) for a lighting device (101) of a motor vehicle is described, comprising a number of semiconductor light sources connected in series, which can be bridged by means of a respective switching unit. A low-dropout voltage regulator is connected in series with the semiconductor light sources.