Vehicle Head Lamp Lighting System with Dynamic Boost Converter Frequency Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The head lamp lighting system of vehicles faces challenges in providing stable power to high power LEDs due to varying battery voltages, and existing step-up converters generate heat and are not suitable for diverse LED functions.
Innovation Solution
A head lamp lighting system utilizing a DC/DC boost converter and multiple DC/DC buck converters, where the boost converter's switching frequency is adjusted based on battery voltage to provide a stabilized output voltage for LEDs, minimizing heat generation and optimizing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a step-up converter is used to provide power supply to head lamp lighting device, then voltage can be increased to suit high power LEDs, but heat is generated and it is not suitable for wide diversity of LED functions
Solution Approach 1:
The power conversion system is segmented into two distinct stages: a boost converter for voltage elevation and multiple buck converters for voltage reduction. This segmentation allows each converter to operate in its optimal efficiency range, reducing overall heat generation while providing diverse voltage outputs for different LED functions.
Solution Approach 2:
The system dynamically selects and configures buck converters based on the specific LED function requirements. Different buck converters can be activated or deactivated depending on whether high beam, low beam, turn indicators, or other functions are needed, optimizing efficiency and reducing heat generation for each specific application.
2Device complexity
If battery voltage is used directly for head lamp lighting system, then system simplicity is maintained, but voltage instability and unsuitability for high power LEDs occur
Solution Approach 1:
The boost converter acts as an intermediary between the unstable battery voltage source and the LED lighting system. It stabilizes the voltage by converting it to a consistent elevated level, ensuring reliable operation of high power LEDs while maintaining relative system simplicity through a standardized conversion approach.
3Ease of operation
If boost converter switching frequency is fixed, then control simplicity is maintained, but efficiency is not optimized across varying battery voltages
Solution Approach 1:
The boost converter switching frequency is made dynamic rather than fixed. The control system automatically adjusts the switching frequency based on the detected battery voltage level, ensuring optimal conversion efficiency across the entire operating range while maintaining simple automated control without manual intervention.
Solution Approach 2:
The system incorporates feedback mechanisms that monitor battery voltage and automatically adjust the boost converter switching frequency in response. This closed-loop control optimizes energy conversion efficiency across varying battery conditions while keeping the control process automated and simple for the user.
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 system ensures stable power supply to various LED functions by adjusting the boost switching frequency according to battery voltage, improving efficiency and reducing heat generation, thus providing a flexible and adaptable lighting solution.
Implementation Method 1
a step-up voltage converter named a direct current-to-direct current (DC/DC) boost converter (22)
Implementation Method 2
three step-down voltage converters named three direct DC/DC buck converters (36, 38, 40)
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A head lamp lighting system (10) of a vehicle (12) comprises a DC/DC boost converter (22) configured to provide a common boosted output voltage (24) from a battery voltage (20), a plurality of DC/DC buck converters (36, 38, 40), each DC/DC buck converter (36, 38, 40) being configured to provide an adjusted buck output current (42, 44, 46) from the common boosted output voltage (24), a plurality of strings (26, 28, 30) of Light-Emitting Diodes (32, 34), each string (26, 28, 30) of Light-Emitting Diodes (32, 34) being electrically connected to only one adjusted buck output current (42, 44, 46) and vice versa, a main controller (16) electrically connected to the DC/DC boost converter (22) and configured to provide a boost switching frequency value to the DC/DC boost converter (22), a battery voltage supervisor (56) electrically connected to the main controller (16) and electrically connected to the battery voltage (20), said battery voltage supervisor (56) being configured to provide the battery voltage value to the main controller (16); the main controller (16) being configured to determine the boost switching frequency value according to the battery voltage value.