OLED TV’ler için 24V/20A LLC rezonanslı dönüştürücü uygulaması

Year 2018, Volume: 24 Issue: 5, 837 - 845, 12.10.2018

Çağatay Özçelik Atiye Hülya Obdan

Abstract

Bu çalışmada, LLC topolojisi
kullanılarak çift transformatör yapısı ile transformatörlerin primer tarafları
seri sekonder tarafları paralel bağlı olacak şekilde rezonanslı dönüştürücü ele
alınmıştır. Seri rezonans karakteristiği sayesinde güç Mosfet’leri sıfır
gerilim altında iletime girmektedir, böylece yarı iletkenler üzerindeki
kayıplar azalmıştır. Önerilen dönüştürücüde transformatörlerin primer sargıları
birbirlerine seri bağlanmıştır, bu sayede çıkış tarafına akım dengeli bir
şekilde sağlanmıştır. Sekonder tarafta transformatörlerin sargıları
birbirlerine paralel bağlanmıştır böylece yük akımı eşit biçimde dağıtılmış
aynı zamanda transformatörlerin sekonder sargılarının ve çıkış doğrultucu
diyotlarının akım stresi azalmıştır. Bu çalışmada LLC rezonanslı dönüştürücünün
çalışma prensibi ele alınmıştır ve OLED TV güç kaynakları için 24V/20A çıkışlı
devrenin PSIM simülasyon modeli ve prototipi oluşturulmuştur.

Keywords

LLC rezonanslı dönüştürücü, Sıfır gerilimde anahtarlama, Elektromanyetik girişim, Anahtarlama kayıpları

Application of 24V/20A LLC resonant converter for OLED TVs

Abstract

This
study aims to come out with a double transformer resonant converter design that
is serially connected in the primary part and parallel connected in the
secondary part while using LLC topology. With the help of serial resonance
characteristics, the power MOSFETs are conducted at zero voltage switching,
therefore the switching power losses on the semiconductor devices are
minimized. In the recommended converter, the primary part of two transformers
are connected in series in order to transmit the load currents to output in a
balanced manner. In the secondary part, the transformers are parallel connected
in order to provide equal distribution of load currents. This, in return,
decreased the current stresses on the secondary part of the transformers and on
the output rectifying diodes. This study provides the working principle of the
series resonant LLC converter topologies by designing the PSIM simulation model
and laboratory prototype with 24V/20A output for OLED TV power source.

Keywords

Resonant LLC converter, Zero voltage switching, Electromagnetic interference, Switching losses

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