Vehicle Lighting Device Voltage-Adaptive Control
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Solution Overview
Problem
Vehicle lighting devices equipped with light emitting diodes face challenges in maintaining a required total luminous flux while suppressing an increase in the rate of change of this flux due to fluctuations in input voltage.
Innovation Solution
A vehicle lighting device with a control element that manages the number of light emitting elements turned on based on input voltage levels, ensuring all elements are turned on at extreme voltage levels and adjusting total luminous flux and current accordingly within a specified voltage range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of light emitting elements to be turned on is reduced when input voltage drops, then the forward voltage drop is reduced and the required total luminous flux can be secured, but the rate of change in the total luminous flux increases
Solution Approach 1:
The patent applies dynamics by making the lighting system adaptable to varying input voltage conditions through dynamic control of light emitting element activation. The control unit dynamically adjusts which light emitting elements are turned on based on real-time voltage detection, enabling the system to maintain optimal performance across different voltage conditions while minimizing abrupt changes in luminous flux
Solution Approach 2:
The patent implements parameter changes by utilizing multiple light emitting elements with different forward voltage characteristics. By selecting and activating specific elements based on the detected input voltage level, the system changes the electrical parameters of the lighting circuit to match the available voltage, thereby maintaining stable total luminous flux output despite voltage fluctuations
2Illumination intensity
If all light emitting elements are turned on, then the total luminous flux is maximized, but the forward voltage drop increases causing the required total luminous flux cannot be secured when input voltage drops
Solution Approach 1:
The patent applies segmentation by dividing the light emitting elements into multiple groups or individual controllable units. This allows the control unit to selectively activate only the necessary number of elements based on input voltage conditions, preventing excessive forward voltage drop while maintaining sufficient total luminous flux when voltage is adequate
Solution Approach 2:
The system dynamically adjusts the number of active light emitting elements based on real-time voltage detection. When input voltage is sufficient, more elements are activated to maximize illumination; when voltage drops, fewer elements are activated to prevent voltage collapse and maintain reliable operation
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 ensures a stable total luminous flux and suppresses the rate of change of this flux, even with input voltage fluctuations, thereby maintaining consistent lighting performance.
Implementation Method 1
vehicle lighting devices equipped with light emitting elements such as light emitting diodes
Data Source
AI summary
A vehicle lighting device and a vehicle lamp are provided. The vehicle lighting includes a socket; a substrate provided on one end portion side of the socket; light emitting elements provided on the substrate; and a control element provided on the substrate and electrically connected to the light emitting elements. The control element turns on some of the light emitting elements when the input voltage is lower than a first voltage; turns on all of the light emitting elements when the input voltage exceeds a second voltage higher than the first voltage; and turns on all of the light emitting elements and changes at least one of total luminous flux of the light emitting elements and current flowing through the light emitting elements according to the input voltage when the input voltage is equal to or higher than the first voltage and equal to or lower than the second voltage.