Vehicle LED Lamp Controller Preheating and Current Limitation
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Solution Overview
Problem
Conventional vehicle LED lamp driving circuits fail to maintain adequate brightness and operational reliability, especially in low temperature environments, as they do not effectively manage LED element failures or temperature variations.
Innovation Solution
A vehicle LED lamp controller with a starting circuit, preheating circuit, and current limitation circuit is introduced, which includes a PNP transistor and temperature sensor for preheating and an electronic switch with a current detector and comparator to ensure consistent current supply and prevent low brightness issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple LED elements are connected in parallel to ensure continued operation when some fail, then reliability is improved, but brightness decreases
Solution Approach 1:
The patent implements dynamic control of LED element connections through a controller that can switch between series and parallel configurations based on operating conditions. The controller dynamically adjusts the circuit topology to maintain optimal brightness while ensuring operational reliability, resolving the static trade-off between these two parameters.
2Adaptability or versatility
If LED elements are used in low temperature environment to expand application range, then adaptability is improved, but operational reliability deteriorates due to inability to work normally
Solution Approach 1:
The patent employs a preheating circuit that activates before the main operation in low temperature environments. This preliminary heating action raises the temperature of LED elements to their optimal operating range, ensuring they can function reliably when deployed in cold conditions, thus enabling broader environmental adaptability without sacrificing reliability.
3Reliability
If preheating circuit provides continuous small current to LED elements in low temperature, then operational reliability is improved, but energy consumption increases
Solution Approach 1:
The patent implements periodic preheating cycles rather than continuous current supply. The preheating circuit operates in intervals, providing just enough heating to maintain LED elements at operational temperature in low temperature environments. This periodic approach significantly reduces energy consumption compared to continuous operation while still ensuring reliable LED function in cold conditions.
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 controller ensures the vehicle LED lamp operates within standard brightness levels and functions reliably in low temperature conditions by providing preheating and automatic current adjustment, addressing the limitations of conventional circuits.
Implementation Method 1
a PNP transistor and temperature sensor for preheating
Implementation Method 2
The preheating circuit can provide a continuous small current to the multiple LED elements when the preheating circuit detects the temperature environment is low
Implementation Method 3
The current limitation circuit is connected between the DC power source and multiple LED elements to automatically connect or disconnect a connection between the multiple LED elements and the DC power source according to changes of current supplied to the multiple LED elements
Data Source
AI summary
A vehicle LED lamp controller connected between one DC power source and multiple LED elements has a starting circuit, a preheating circuit and a current limitation circuit. The starting circuit is connected to the power source through the preheating circuit and connected to the multiple LED elements. The preheating circuit provides a continuous small current to the multiple LED elements to preheat the LED elements when the preheating circuit detects the temperature environment is low. The current limitation circuit is connected between the DC power source and multiple LED elements to automatically connect or disconnect a connection between the multiple LED elements and the DC power source according to changes of current supplied to the multiple LED elements. Therefore, the present invention provides a safety circuit loop.