LED Matrix Headlight Power Supply With Dynamic Voltage Control
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Solution Overview
Problem
Current LED matrix circuit arrangements in car headlights experience high power losses and self-heating due to excessive voltage supply, leading to reduced luminous efficacy and the need for complex cooling systems and high-quality components.
Innovation Solution
A control unit that reads temperature, voltage, and current measurements to optimize the voltage source and current sources, reducing unnecessary heat generation by adjusting the voltage and current to the minimum necessary levels, using temperature and voltage characteristic curves to determine optimal operating points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the voltage source provides a high supply voltage to ensure sufficient voltage for all series circuits, then the desired current levels are achieved, but power losses and self-heating increase
Solution Approach 1:
The patent implements dynamic voltage adjustment where the control unit continuously monitors temperature and voltage values, then adjusts the voltage source output dynamically. The voltage is increased only when necessary (when temperature decreases or voltage drops below threshold) and reduced when conditions improve, replacing the static high-voltage approach with an adaptive system that maintains reliability while minimizing energy loss.
Solution Approach 2:
The control unit receives feedback from temperature sensors and voltage measurements across series circuits. Based on this feedback, the control unit determines whether to increase or decrease the voltage source output. This closed-loop feedback mechanism ensures current levels are maintained reliably while avoiding excessive voltage that would cause unnecessary power losses and heating.
2Reliability
If the voltage source provides excessive voltage, then sufficient voltage is available for all series circuits, but self-heating of electronic components increases
Solution Approach 1:
The system dynamically adjusts voltage based on real-time temperature monitoring. When temperature rises above a threshold, the control unit reduces the voltage source output, directly addressing the self-heating problem. When temperature drops, voltage is increased to maintain current levels. This dynamic response prevents excessive self-heating while ensuring voltage sufficiency when needed.
Solution Approach 2:
Temperature sensors provide continuous feedback to the control unit about the thermal state of electronic components. The control unit uses this feedback to adjust voltage levels, reducing voltage when temperatures are high to minimize further self-heating, and increasing voltage when temperatures are acceptable to maintain proper current levels.
3Loss of energy
If higher LED temperatures are accepted, then power losses are reduced, but luminous efficacy decreases
Solution Approach 1:
The control unit dynamically adjusts voltage to maintain LED temperatures within an optimal range. By preventing excessive temperature increases, the system maintains higher luminous efficacy. The dynamic adjustment ensures voltage is high enough to drive LEDs efficiently but not so high that temperatures rise and reduce efficacy, thus optimizing the trade-off between power losses and illumination intensity.
4Temperature
If complex cooling concepts are implemented, then excessive heating is prevented, but device complexity increases
Solution Approach 1:
The system uses the existing control unit and voltage source adjustability to manage temperature, eliminating the need for separate active cooling systems. The control unit monitors temperature and adjusts voltage to prevent excessive heating, allowing the electronics to self-regulate their thermal state. This approach prevents overheating while avoiding the complexity of additional cooling hardware.
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 approach minimizes power losses and self-heating, maintaining higher luminous efficacy while reducing the need for excessive cooling and high-quality components.
Implementation Method 1
This results in high power losses in the voltage source, the LEDs, the current sources and the associated components. The self-heating of the electronic components is high
Data Source
AI summary
A circuit arrangement for a light having: an input for connection to a supply network; an adjustable voltage source, an input of the voltage source; a matrix of LEDs connected to the output of the voltage source; and a control unit to which the control connection of the voltage source is connected. The circuit arrangement has series circuits including at least one LED and one adjustable current source. The series circuits are connected in parallel, thus forming the matrix. The voltage source adjusts its output voltage to the setpoint voltage value provided by the control connection by the control unit. The control unit has an input for reading in: status information about the temperature in the matrix; measurement values for temperatures of the LEDs; measurement values for the voltages across the current sources; measurement values for the voltage across the matrix; and measurement values for the voltages at the LEDs.