LED Module Life Prediction via Forward Voltage Jump Detection
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Solution Overview
Problem
Existing LED modules face premature failure due to thermal and mechanical stress at soldering points, which is not effectively detected by current methods, leading to unpredictable life expectancy.
Innovation Solution
A method that continuously monitors the forward voltage of LED modules, detecting voltage jumps of specific magnitude and duration to predict impending failure, and provides alarm information to alert users of potential failure, incorporating a device with a microcontroller and A/D converter to store and analyze voltage data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional monitoring methods are used to detect LED failure, then individual LED short-circuits can be detected, but solder joint fatigue and thermal distortions causing premature module failure cannot be detected
Solution Approach 1:
The patent uses forward voltage as an intermediary parameter to indirectly detect solder joint fatigue and thermal distortions. Instead of directly measuring the physical condition of solder joints, the method monitors voltage fluctuations across the LED module, which serve as a mediator indicating internal stress and potential failure modes that conventional methods cannot detect.
Solution Approach 2:
The patent replaces direct mechanical or physical inspection methods with electrical measurement. By substituting voltage monitoring for direct observation of solder joint conditions, the system can detect thermal distortions and mechanical stress effects through electrical parameter changes, enabling non-intrusive continuous monitoring.
2Measurement precision
If forward voltage is monitored continuously to detect solder joint fatigue, then early failure detection is enabled, but the system must distinguish between noise and significant voltage transients
Solution Approach 1:
The patent applies dynamic thresholds for voltage jump detection rather than static thresholds. The minimum jump voltage (at least 60 mV) and jump duration (less than 100 ms) parameters allow the system to adapt to varying operating conditions and distinguish between significant failure-indicating voltage changes and normal operational noise, improving measurement precision without requiring overly complex filtering mechanisms.
Solution Approach 2:
The patent changes the monitoring parameters to detect specific characteristics of voltage jumps associated with solder joint fatigue. By focusing on voltage magnitude (minimum 60 mV) and temporal characteristics (duration less than 100 ms), the system transforms the detection problem into identifying specific parameter patterns that differentiate true failure indicators from noise.
3Reliability
If voltage monitoring is implemented to predict life expectancy, then premature failure can be detected, but the method requires frequent voltage measurements to capture rapid voltage jumps
Solution Approach 1:
The patent performs preliminary detection of voltage jumps that indicate early stages of solder joint fatigue. By detecting voltage changes before complete failure occurs, the system enables proactive maintenance scheduling and replacement planning, allowing the LED module to continue operating safely until the predicted failure point while maintaining high reliability.
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
Enables early detection of solder joint fatigue and thermal distortions, allowing for timely replacement and reducing the risk of sudden LED module failure, with the method distinguishing between noise and significant voltage transients.
Implementation Method 1
The detection of forward voltages can be carried out, for example, by an A/D converter, whereby the forward voltages detected by the A/D converter are stored in a memory array of a microcontroller.
Data Source
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AI summary
The invention relates to a method for determining lifetime information of an LED module with a plurality of LEDs, wherein the method comprises the steps of: detecting forward voltages of the LED module at times less than 100 ms apart, comparing a currently detected forward voltage with one or more previously detected forward voltages to detect a voltage jump that reaches a minimum jump voltage within a predetermined jump duration, wherein the minimum jump voltage is at least 60 mV and the predetermined jump duration is less than 100 ms, and determining lifetime information based on one or more detected voltage jumps.