Automotive Headlight Voltage Control for Luminous Intensity and Service Life
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Solution Overview
Problem
Current dual-function automobile headlights face a trade-off between luminous intensity and service life, as higher voltage for increased luminous intensity shortens the lamp's service life, while longer service life results in lower luminous intensity and power, making it difficult to achieve a balance between performance and longevity.
Innovation Solution
A method where the light source in automobile headlights is supplied with a different power voltage based on the operating mode, using a voltage close to the nominal voltage in main beam mode and a voltage lower than nominal in dipped beam mode, utilizing a lighting controller and regulation electronic circuit to manage pulse width modulation signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the light source is supplied with higher voltage to increase luminous intensity, then the luminous flux and luminous intensity improve, but the service life of the light source decreases
Solution Approach 1:
The patent applies dynamics by making the power supply voltage variable rather than fixed. The lighting controller dynamically adjusts the voltage supplied to the light source based on the operating mode (main beam or dipped beam), allowing the system to optimize between luminous intensity and service life in real-time according to actual lighting requirements
Solution Approach 2:
The patent changes the electrical parameter (voltage) supplied to the light source based on operating conditions. By supplying a first voltage close to nominal voltage during main beam mode and a second lower voltage during dipped beam mode, the system achieves high luminous intensity when needed while extending service life during prolonged operation
2Duration of action of stationary object
If the light source is supplied with lower voltage to extend service life, then the service life increases, but the luminous intensity and power decrease
Solution Approach 1:
The system dynamically switches between two voltage levels based on operating mode requirements. During main beam mode when high power is needed, the controller supplies voltage close to nominal; during dipped beam mode, it supplies lower voltage to conserve the light source, creating an adaptive power management strategy
Solution Approach 2:
The patent implements periodic action through pulse width modulation (PWM) control. The lighting controller uses PWM signals to regulate the power delivered to the light source, providing full power in short bursts during main beam mode and reduced power during extended dipped beam operation, effectively managing the trade-off between power output and service life
Data Source
AI summary
A method and headlight adapted to supply power to a dual-mode automobile headlight light source able to provide either main beam mode lighting or dipped beam mode lighting, wherein the light source is supplied with electrical power at a first voltage when it is in main beam mode and at a second voltage when it is in dipped beam mode, the second voltage being lower than the first voltage.