Vehicle Lamp Circuit Layout for Lighting During Voltage Drop
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Vehicle lighting devices equipped with light emitting diodes face challenges in maintaining lighting when input voltage drops, as the number and configuration of light emitting elements are optimized for standard voltages, leading to potential failure during voltage fluctuations, such as when the engine is started.
Innovation Solution
A vehicle lighting device with a first circuit containing multiple light emitting elements and a control element to manage current, and a second circuit with fewer light emitting elements and a resistor, allowing the device to adjust the number of elements active based on input voltage to maintain luminous flux.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the number of light emitting elements is increased to provide sufficient luminous flux at standard voltage (13.5V), then the lighting performance is improved under normal conditions, but the lighting cannot be maintained when input voltage drops (e.g., to 6V during engine starting)
Solution Approach 1:
The light emitting elements are divided into two separate groups: a first group connected in series that provides high luminous flux under normal voltage conditions, and a second group connected in parallel that activates when voltage drops. This segmentation allows the system to adapt its configuration based on input voltage levels, maintaining reliable lighting across varying voltage conditions while optimizing illumination intensity for each operating scenario.
2Illumination intensity
If light emitting elements are connected in series to achieve the required luminous flux at standard voltage, then the lighting performance is optimized for normal operation, but the circuit becomes vulnerable to complete failure when voltage drops below the threshold required to drive all series elements
Solution Approach 1:
The circuit configuration dynamically switches between two states based on input voltage conditions. During normal operation at standard voltage, all light emitting elements are activated in series to maximize luminous flux. When voltage drops occur (such as during engine starting), the circuit automatically transitions to activate only the second group of elements connected in parallel, ensuring continued lighting functionality. This dynamic reconfiguration enables the system to adapt to varying voltage conditions rather than remaining fixed in a single series configuration.
3Use of energy by moving object
If the circuit is designed for optimal performance at standard voltage (13.5V), then the lighting efficiency is maximized under normal conditions, but the system lacks the capability to maintain lighting during voltage fluctuations such as engine starting
Solution Approach 1:
The lighting circuit is designed with multi-functionality to handle both normal voltage operation and voltage drop scenarios. The first group of light emitting elements optimizes lighting efficiency under standard voltage conditions through series connection, while the second group provides backup lighting capability during voltage drops through parallel connection. This universal design ensures the system can effectively perform its lighting function across diverse operating conditions, maintaining both efficiency during normal operation and reliability during voltage fluctuations.
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 the vehicle lighting device to maintain lighting and required luminous flux even when the input voltage drops, suppressing fluctuations and ensuring continuous operation across varying voltage conditions.
Implementation Method 1
a vehicle lighting device equipped with light emitting elements such as light emitting diodes has been widely adopted
Data Source
AI summary
Provided are a vehicle lighting device and a vehicle lamp that can maintain lighting even when an input voltage drops. The vehicle lighting device according to an embodiment includes a socket; a substrate provided on one end side of the socket; a first circuit provided on the substrate; and a second circuit provided on the substrate. The first circuit has a plurality of first light emitting elements; and a control element electrically connected to the plurality of first light emitting elements and controlling a value of a current flowing through the plurality of first light emitting elements. The second circuit has second light emitting elements the number of which is smaller than the number of the plurality of first light emitting elements; and a resistor connected in series to the second light emitting elements.