Current-regulated Vehicle LED with Switching Circuit
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Solution Overview
Problem
Conventional light emitting devices for vehicles face stability and service life issues due to increased operating temperatures caused by continuous operation under unstable battery voltage, leading to reduced performance and lifespan.
Innovation Solution
A current-regulated light emitting device with a switching design that includes a light emitting unit and a current limiting unit comprising switches and bias units to regulate current flow, preventing continuous operation and overheating by interrupting current when a threshold is exceeded, and enhancing brightness during braking through a brightness increasing unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a voltage regulating unit is used to stabilize drive voltage from an unstable battery, then the light emitting device can operate with stable voltage, but the operating temperature of the voltage regulating unit increases and service life is reduced
Solution Approach 1:
The patent replaces the conventional voltage regulating unit (electronic system) with a switching circuit consisting of transistors and diodes that operate as electronic switches. This substitution changes the method of voltage stabilization from continuous regulation to periodic switching, thereby reducing continuous heat generation and improving service life while maintaining voltage stability
Solution Approach 2:
The switching circuit operates periodically by turning the transistor on and off based on voltage threshold detection. The diode conducts only when the anode voltage exceeds the cathode voltage by a threshold amount, creating periodic switching action that stabilizes voltage while allowing the components to rest and cool between operations, thus reducing overall operating temperature
2Duration of action of moving object
If continuous operation is maintained to ensure light output, then the light emitting device remains illuminated, but operating temperature increases and stability decreases
Solution Approach 1:
The switching circuit provides periodic operation instead of continuous operation. The transistor switches on and off based on voltage conditions, creating pulsed light output that maintains average illumination while allowing components to cool down during the off periods, thereby improving reliability and reducing temperature-related instability
Solution Approach 2:
The circuit incorporates feedback through the diode and transistor configuration that monitors the voltage across the light emitting component. When the voltage exceeds a threshold, the diode conducts and turns off the transistor, interrupting current flow. This feedback mechanism automatically regulates operation to prevent overheating while maintaining light output, improving both stability and reliability
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 achieves stable current regulation and reduced operating temperatures, improving the stability and service life of the device while providing increased brightness during braking, thus addressing the temperature-related issues in conventional devices.
Implementation Method 1
a light emitting module that has a light emitting component
Implementation Method 2
The first switch is adapted for making and breaking an electrical circuit between the light emitting unit and the electric power source
Implementation Method 3
Conduction of the second switch forces the first switch to turn off so as to break the electrical circuit between the light emitting unit and the electric power source
Data Source
AI summary
A current-regulated light emitting device for vehicle use includes a light emitting unit and a current limiting unit. The current limiting unit includes first and second switches and first and second bias units. The first switch is for making and breaking an electrical circuit between the light emitting unit and an electric power source. The first bias unit is for causing the first switch to conduct so as to activate the light emitting unit when the first bias unit receives a drive voltage from the electric power source. The second bias unit is for causing the second switch to conduct when amount of current flowing through the first switch exceeds a predetermined threshold, thereby turning off the first switch to interrupt current flow through the light emitting unit.