Soft Switching LED Driver Implementation with ZCS Buck Converter

Öz

The development of semiconductor technology has led to the widespread adoption of LEDs as a highly efficient and economical lighting system. In order for LED systems to achieve higher efficiency, the driver circuits must also operate with high efficiency. Conventional PWM hard switching power converters used in LED drivers experience excessive heating of their power switches due to switching losses, leading to a reduction in power conversion efficiency. In order to enhance the power conversion efficiency of LED drivers, it is necessary to use solutions that minimize the switching losses. One of these solutions is the use of soft-switching power converters. This paper proposes a half-wave (HW) zero-current switching (ZCS) buck converter as a solution to improve LED driver’s efficiency. The switching frequency of the proposed LED driver was varied between 142-200 kHz, and the brightness of the LEDs dimmed under ZCS conditions. A comparison of the effect of MOSFET temperature between the proposed HW-ZCS buck converter and a conventional PWM buck converter based LED driver has also been made.

Anahtar Kelimeler

• ZCS Buck Converter
• LED Driver
• Soft Switching

ZCS Buck Dönüştürücü ile Yumuşak Anahtarlamalı LED Sürücü Uygulaması

Öz

Yarı iletken teknolojisindeki gelişmeler, LED’lerin yüksek verimli ve ekonomik bir aydınlatma sistemi olarak yaygın şekilde kullanılmasına olanak sağlamıştır. LED sistemlerinin daha yüksek verimle çalışabilmesi için sürücü devrelerinin de yüksek verimle çalışması gerekmektedir. LED sürücülerinde kullanılan geleneksel PWM tabanlı sert anahtarlamalı güç dönüştürücülerinde, anahtarlama kayıpları nedeniyle güç anahtarlarında aşırı ısınma meydana gelmekte ve bu durum güç dönüşüm veriminin azalmasına yol açmaktadır. LED sürücülerinin güç dönüşüm verimini artırmak için anahtarlama kayıplarını en aza indiren çözümlerin kullanılması gerekmektedir. Bu çözümlerden biri yumuşak anahtarlamalı güç dönüştürücülerin kullanılmasıdır. Bu çalışmada, LED sürücüsünün verimliliğini artırmak amacıyla yarım dalga (HW) sıfır akımda anahtarlamalı (ZCS) bir buck dönüştürücü önerilmektedir. Önerilen LED sürücüsünün anahtarlama frekansı 142–200 kHz aralığında değiştirilmiş ve LED’lerin parlaklığı ZCS koşulları altında kısılmıştır. Ayrıca, önerilen HW-ZCS buck dönüştürücü ile geleneksel PWM tabanlı buck dönüştürücüye sahip LED sürücüsünün MOSFET gövde sıcaklığı üzerindeki etkileri karşılaştırılmıştır.

Anahtar Kelimeler

• ZCS Buck Dönüştürücü
• LED Sürücü
• Yumuşak Anahtarlama

Kaynakça

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