Vehicle LED Lighting Circuit Voltage Fluctuation Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Vehicle lighting devices with LEDs face issues of reduced luminous flux due to voltage fluctuations, leading to uneven light emission and potential overheating, as some LEDs stop functioning when voltage decreases, causing current surges in remaining LEDs.
Innovation Solution
Incorporating a control circuit with resistors and a control portion that measures input voltage, allowing current to flow through additional LEDs in parallel when voltage drops, maintaining required luminous flux and stabilizing light output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the voltage applied to the vehicle lighting device decreases, then power consumption is reduced, but the total luminous flux becomes less than the specified value
Solution Approach 1:
The patent divides the series-connected LED string into multiple groups with different numbers of LEDs. By selectively activating specific groups based on input voltage levels, the system can maintain adequate luminous flux even when overall power consumption decreases due to lower voltage.
Solution Approach 2:
The control portion changes the operating parameters by adjusting which LED groups are active based on the detected input voltage. When voltage decreases, the system switches to a configuration that maintains minimum luminous flux requirements, thereby adapting to varying power conditions.
2Illumination intensity
If the current does not flow through some light emitting diodes, then the total luminous flux is maintained, but the current flowing through remaining light emitting diodes suddenly increases
Solution Approach 1:
By segmenting the LED string into multiple groups that can be independently controlled, the patent prevents sudden current increases in remaining LEDs. When some LEDs are deactivated, the current is distributed across multiple active groups rather than concentrating entirely on the remaining LEDs.
Solution Approach 2:
The control portion continuously monitors the input voltage and provides feedback to adjust which LED groups are active. This feedback mechanism ensures smooth transitions and prevents sudden current spikes by proactively managing current distribution based on real-time voltage conditions.
3Loss of energy
If the voltage applied to the vehicle lighting device decreases, then energy efficiency improves, but the current flowing through remaining LEDs rapidly increases causing luminous flux fluctuation
Solution Approach 1:
The patent segments the LED circuit into multiple controllable groups, allowing the system to maintain stable luminous flux by distributing current across active groups even when overall voltage and power consumption decrease. This segmentation prevents rapid luminous flux changes that would otherwise occur with simple LED deactivation.
Solution Approach 2:
The control portion dynamically adjusts the configuration of active LED groups based on real-time voltage detection. This dynamic adaptation allows the system to optimize energy efficiency while maintaining luminous flux stability by smoothly transitioning between different LED group configurations rather than making abrupt changes.
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
Ensures consistent and stable luminous flux even at lower voltages, preventing sudden current increases and maintaining light distribution characteristics, thus enhancing vehicle lighting performance.
Implementation Method 1
a plurality of light emitting diodes (LEDs) which are connected in series
Implementation Method 2
a first resistor connected in series to the light emitting element
Data Source
AI summary
According to one embodiment, a vehicle lighting device includes a first circuit portion that has at least one light emitting element and a first resistor connected in series to the light emitting element; a second circuit portion that is connected in parallel to the first circuit portion and has at least a control portion; and a third circuit portion that is connected in series to the first circuit portion and the second circuit portion, and has at least one light emitting element.The control portion measures an input voltage and causes a current to flow through the third circuit portion in a case where the measured input voltage is a predetermined value.