Vehicle Lighting Device Dynamic Frequency Control
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Solution Overview
Problem
Conventional vehicle lighting devices with load-operable light emitting elements, such as LEDs, face challenges in maintaining stable output current across varying luminous flux levels, requiring frequent component adjustments and limiting the range of adaptable output currents, leading to unstable current supply when set low.
Innovation Solution
The vehicle lighting device incorporates a power conversion component with a coil and switching element, along with a frequency adjusting component that adjusts the switching cycle based on output current settings, ensuring the coil current remains above zero even at low output currents, and employs an output current setting device to manage different luminous flux ranks by adjusting resistance values and frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed frequency and duty cycle setting is used in the power conversion component, then the device complexity is reduced, but the adaptability of output current settings is limited
Solution Approach 1:
The patent implements dynamic frequency adjustment in the frequency adjusting component based on the output current setting signal. The frequency changes dynamically according to the desired output current level, allowing the system to adapt to different output requirements without increasing overall device complexity through fixed design parameters.
2Use of energy by moving object
If the output current setting is reduced to low values, then the energy consumption is reduced, but the coil current may drop below zero causing instability
Solution Approach 1:
The patent employs feedback control where the frequency adjusting component receives the output current setting signal and adjusts the frequency accordingly. This feedback mechanism ensures that even at low output current settings, the frequency is optimized to prevent coil current from dropping below zero, maintaining stability while allowing low energy consumption operation.
Solution Approach 2:
The patent changes the frequency parameter dynamically based on the output current setting. When output current is reduced to save energy, the frequency is adjusted to compensate and prevent coil current instability, thus maintaining reliability across the full range of energy consumption levels.
3Manufacturing precision
If different components are replaced to achieve different output current settings, then the manufacturing precision is improved, but the device complexity and cost increase
Solution Approach 1:
The patent implements a universal power conversion component that can provide multiple output current settings through frequency adjustment rather than requiring different physical components. The frequency adjusting component enables a single device to perform multiple output current settings, reducing device complexity while maintaining manufacturing precision through controlled frequency variations.
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
This configuration allows for stable output current supply across a wide range without component replacement, simplifying component management and reducing costs, while maintaining stable current flow even at low output settings.
Implementation Method 1
a power conversion component (1) that converts a direct-current power that is inputted and supplies the converted output current for output
Implementation Method 2
a load that is operable by a current; a light emitting element that emits a luminous flux
Data Source
AI summary
The present invention provides a vehicle lighting device that can set a wide output current without replacing a component such as a coli. An output current setting device 7 sets an output current setting signal 8 in such a manner that an output current 5 in accordance with a luminous flux of an LED 2 is outputted. The output current setting signal 8 is supplied to a frequency adjusting component 3a and an output current detecting component 3b. The frequency adjusting component 3a generates a triangle wave of a frequency based upon the output current setting signal 8, and supplies the triangle wave to an output adjusting-signal generating component 3c. The output adjusting-signal generating component 3c compares the triangle wave with a signal voltage that is outputted from the output current detecting component 3b to generate an output adjusting signal 6, which is supplied to a switching element 30.