Investigation of the Effects of Different Operating Regions of ZVS LLC Resonant Converter on the Converter Performance

Year 2024, , 109 - 119, 29.02.2024

Salih Nacar , Selim Öncü

https://doi.org/10.2339/politeknik.1089364

Cited By: 1

Abstract

FM controlled ZVS LLC resonant converter operates with low switching losses at high switching frequencies for a wide input voltage range. To obtain a constant output voltage against varying input voltage and load, the DC voltage gain of the converter, hence its operating intervals, needs to be changed. In different operating intervals, many operating parameters change besides the DC voltage gain of the converter. In this study, ZVS operating intervals of the converter are compared in terms of efficiency, switch stresses, and soft switching for constant output voltage against varying input voltage and load. The prototype circuit of the converter with the input voltage range of 80-120 V, nominal input voltage of 100 V, and output voltage of 8 V is established. The measurement results obtained from the prototype circuit for much different input voltage and load values are presented comparatively. The effect of different ZVS operating intervals on the operating parameters of the converter is revealed in many ways. Moreover, it is observed that the operating performance of the converter around series resonance frequency is better than the operating frequencies far from this frequency value.

Keywords

LLC resonant converter, ZVS, FM control, soft switching

ZVS LLC Rezonans Dönüştürücünün Farklı Çalışma Aralıklarının Dönüştürücü Performansına Etkilerinin İncelenmesi

Abstract

FM kontrollü ZVS LLC rezonans dönüştürücü, geniş bir giriş gerilim aralığı için yüksek anahtarlama frekanslarında düşük anahtarlama kayıpları ile çalışabilmektedir. Değişen giriş gerilimi ve yüke karşı sabit çıkış gerilimi elde etmek için dönüştürücünün DC gerilim kazancının, dolayısıyla çalışma aralıklarının değiştirilmesi gerekmektedir. Farklı çalışma aralıklarında dönüştürücünün DC gerilim kazancının yanı sıra birçok çalışma parametresi de değişmektedir. Bu çalışmada dönüştürücünün ZVS çalışma aralıkları değişen giriş gerilimine ve yüke karşı sabit çıkış gerilimi için verim, anahtar stresleri ve yumuşak anahtarlama yönünden karşılaştırılmıştır. Giriş gerilim aralığı 80-120 V, nominal giriş gerilimi 100 V ve çıkış gerilimi 8 V olan dönüştürücünün prototip devresi kurulmuştur. Birçok farklı giriş gerilim ve yük değeri için prototip devre üzerinden alınan ölçüm sonuçları karşılaştırmalı bir şekilde sunulmuştur. Farklı ZVS çalışma aralıklarının dönüştürücünün çalışma parametreleri üzerindeki etkisi birçok yönden ortaya konulmuştur. Ayrıca dönüştürücünün seri rezonans frekansı civarındaki çalışma performansının, bu frekans değerinin uzağındaki çalışma frekanslarına göre daha iyi olduğu gözlemlenmiştir. 

Keywords

LLC rezonans dönüştürücü, ZVS, FM kontrol, yumuşak anahtarlama

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