Vehicle LED Current Regulation via Periodic Switching
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Solution Overview
Problem
Conventional light emitting devices for vehicles face instability due to fluctuating battery voltage, leading to increased operating temperatures and reduced stability and service life of voltage regulating components.
Innovation Solution
A current-regulated light emitting device with a switching design that employs MOSFET and BJT switches to regulate current flow, using protective diodes and bias units to manage voltage and prevent overheating, allowing components to operate at lower temperatures.
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 the electric power source, 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 employs a switching power supply design where the voltage regulating unit operates in periodic switching cycles rather than continuous operation. The switching unit alternates between on and off states, with the light emitting device receiving power during on-periods and the switching unit resting during off-periods. This periodic operation allows heat dissipation during off-cycles, reducing peak operating temperature and extending component service life while maintaining stable average output voltage.
2Stability of the object's composition
If a conventional voltage stabilizing circuit is used, then voltage can be stabilized, but the device complexity increases due to additional components
Solution Approach 1:
The patent integrates multiple functions into a single switching power supply unit that combines voltage regulation, current control, and power conversion operations. The switching unit serves as both the voltage regulating element and the power delivery mechanism, eliminating the need for separate voltage stabilizing circuits. This functional merging reduces the number of components and simplifies the overall circuit architecture while maintaining stable voltage output.
3Duration of action of moving object
If continuous operation mode is used, then the light emitting device remains illuminated, but operating temperature increases and service life decreases
Solution Approach 1:
The switching power supply implements periodic on-off cycles where the switching unit operates intermittently rather than continuously. During on-periods, the light emitting device receives full power for illumination. During off-periods, the switching unit is deactivated, allowing heat dissipation and temperature reduction. This periodic operation mode maintains continuous illumination over extended periods while preventing excessive temperature buildup that would reduce component service life.
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 provides stable current regulation and increased brightness during braking, preventing continuous operation and overheating, thus enhancing stability and extending the service life of the device.
Implementation Method 1
The light emitting unit 64 includes a plurality of light emitting components (D)
Implementation Method 2
A current-regulated light emitting device with a switching design that employs MOSFET and BJT switches to regulate current flow
Implementation Method 3
using protective diodes and bias units to manage voltage and prevent overheating
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A current-reglated light emitting device for vehicle use includes a light emitting unit (1) and a current limiting unit (2). The current limiting unit (2) includes first and second switches (Q1, Q2) and first and second bias units. The first switch (Q1) is for making and breaking an electrical circuit between the light emitting unit (1) and an electric power source (4). The first bias unit is for causing the first switch (Q1) to conduct so as to activate the light emitting unit (1) when the first bias unit receives a drive voltage (V1) from the electric power source (4). The second bias unit is for causing the second switch (Q2) to conduct when amount of current flowing through the first switch (Q1) exceeds a predetermined threshold, thereby turning off the first switch (Q1) to interrupt current flow through the light emitting unit (1).