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Dynamic Thermal Voltage Adaptation for LED Branches in Automotive Applications.

Jose R Martínez-Pérez1, Miguel A Carvajal2, Juan J Santaella1

  • 1R&D Department, Valeo, 23600 Martos, Spain.

Sensors (Basel, Switzerland)
|September 13, 2025
PubMed
Summary
This summary is machine-generated.

This study introduces a simple thermistor-based method to stabilize DC-DC converter output for automotive LED lighting. The technique ensures consistent performance across temperatures, enhancing efficiency and reducing costs.

Keywords:
LEDautomotive lightingpowertemperaturethermistor

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Area of Science:

  • Electrical Engineering
  • Automotive Systems Engineering
  • Thermal Management

Background:

  • Automotive lighting and signaling systems require stable power from DC-DC converters.
  • Temperature variations can affect the performance and efficiency of LED drivers.
  • Existing thermal compensation methods are often too complex for industrial application.

Purpose of the Study:

  • To present a novel, simple technique for thermally compensating the power output of DC-DC converters for automotive LED applications.
  • To ensure stable bias voltage for current drivers across a wide temperature range.
  • To improve system efficiency and reduce costs in automotive lighting systems.

Main Methods:

  • Incorporation of a temperature-sensitive thermistor into the DC-DC converter's control loop.
  • Exploration of different control loop configurations, including resistor-thermistor networks.
  • Analysis of optimized configurations for voltage response under diverse thermal conditions.

Main Results:

  • Achieved a 75% relative reduction in power dissipation by the current driver.
  • Demonstrated a 50% improvement in the relative efficiency of the LED branch system.
  • Maintained consistent power consumption and stable bias voltage over a wide temperature range.

Conclusions:

  • The proposed thermistor-based method offers a simple and effective solution for thermal compensation in automotive LED systems.
  • The technique reduces power dissipation, enhances system efficiency, lowers costs, and contributes to reduced CO2 emissions.
  • This approach addresses a gap in existing literature by providing an industrially viable solution.