Closed-Loop Control of LCL-T Resonant DC-DC Converter Operating as Automotive LED Driver
| Autor: | Montu Doshi, Khurram K. Afridi, Satyaki Mukherjee, Alihossein Sepahvand, Vahid Yousefzadeh, Dragan Maksimovic, Mausamjeet Khatua |
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| Rok vydání: | 2019 |
| Předmět: |
Physics
Steady state (electronics) 05 social sciences Transistor 020207 software engineering 02 engineering and technology Filter (signal processing) Current source law.invention Matrix (mathematics) law Control theory 0202 electrical engineering electronic engineering information engineering Constant current 0501 psychology and cognitive sciences Current (fluid) 050107 human factors Light-emitting diode |
| Zdroj: | 2019 IEEE Energy Conversion Congress and Exposition (ECCE). |
| DOI: | 10.1109/ecce.2019.8912254 |
| Popis: | This paper presents an automotive LED matrix driver with improved dynamic performance, based on an LCL-T resonant network and a π filter. This LED driver can efficiently deliver a constant current to an LED matrix string with a fast-changing number of LEDs. This is achieved by the inherent current source nature of the LCL-T resonant converter and a π filter with smaller filtering elements. High efficiency is achieved by maintaining zero-voltage and near zero-current switching of all transistors. The performance of this converter is further enhanced by closed loop control of the LED current. A 2-MHz prototype LCL-T resonant converter, designed to drive 1-15 series connected LEDs with a constant current of 0.5 A, is built and tested. The overshoots and undershoots in LED current during load transients are greatly reduced from 90% to 10%. This prototype achieves a peak efficiency of 94% and maintains an average efficiency of 91% over its 15:1 output voltage range (3.3 V to 49.5 V). |
| Databáze: | OpenAIRE |
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