Comparison of exponential and constant voltage based models of power LED driven by isolated CUK DC-DC converter

Abstract

Design and application of LED driver with isolated CUK converter for 10W is realized in this paper especially for automotive purposes. The advantage of isolated CUK topology from conventional CUK topology is to have electrical isolation with supply and load and providing same polarity output. Besides, power LED models including constant voltage and exponential model are obtained and employed in simulation study. Furthermore, maximum current limitation of power LED is provided via dsPIC30f4011 microcontroller. Also, power switch is operated by 100 kHz switching frequency, and connection of the power LED driver to the source provided by LC with parallel damping filter, whose noise reduction shown by application as well. Thanks to the experimental set up and simulations, proving the desired results provided by the converter is shown by the measurement of LED current-voltage, input voltage-current. Simulation results also verifies application. Moreover, it is shown that exponential power LED model provides more accurate results than constant voltage model.

Keywords

• Automotive
• DC-DC
• Isolated CUK
• Power LED
• Model

İzoleli DC-DC CUK konverter ile sürülen güç LED’inin üstel ve sabit gerilime dayalı modellerinin karşılaştırılması

Öz

Bu çalışma, özellikle otomotiv uygulamaları için, 10 W’a kadar izoleli CUK dönüştürücü kullanan LED sürücünün tasarımı ve uygulaması gerçekleştirilmiştir. İzoleli CUK dönüştürücünün geleneksel CUK dönüştürücüye göre avantajı yük ve kaynak arasındaki izolasyon ve aynı polaritedeki çıkış gerilimidir. Ek olarak, karşılaştırma için, güç LED’inin sabit gerilim ve eksponansiyel modelleri çıkarılmıştır ve benzetimde kullanılmıştır. İlaveten, maksimum güç LED’i akım sınırlaması dsPIC30f4011 denetleyicisi ile sağlanmıştır. Bununla birlikte, güç anahtarı 100 kHz anahtarlama frekansında çalıştırılmıştır ve dönüştürücünün kaynağa bağlantısı, paralel bastırmalı LC filtre ile gerçekleştirilmiştir ve filtrenin gürültü azaltımı uygulama sonuçları ile gösterilmiştir. Deneysel uygulama ve benzetimler ile dönüştürücün istenilen sonuçları sağladığı, ölçülen LED akım-gerilimi, giriş-akım gerilimi ile gösterilmiştir. Uygulama sonuçları da benzetim üzerinden doğrulanmıştır. Ayrıca, eksponansiyel güç LED’i modelinin, sabit gerilim modeline göre daha doğru sonuçlar verdiği gösterilmiştir

Anahtar Kelimeler

• Otomotiv
• DC-DC
• Izoleli CUK
• Güç LED’i
• Model

Kaynakça

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