High-Efficient Resonant Converter for LED Driver Applications

Abstract

In this study, a boost-type Pulse Width Modulation (PWM)-resonant converter is proposed for LED driver applications. Thanks to resonance operation, the converter works with zero current switching for most of the switching instants. Thus, high efficiency can be obtained more easily. It utilizes capacitive energy transfer and offers a reduction in the required inductor size. This leads to converter designs with high power density. The operation principle of the PWM-resonant converter is presented by performing its static analysis and explaining the design constraints. The mathematical proof for determining key design parameters is also given before being verified experimentally, together with other findings. The small-signal ac model of the converter is derived, and a type II compensator is designed to achieve closed-loop current control for LED dimming applications. A 200W PWM-resonant converter prototype was built to evaluate the converter performance under steady-state and transient conditions. Experimental and simulation results are provided to verify the theoretical analysis.

Keywords

• DC-DC power converters
• resonant converters
• zero-current switching
• current control

LED Sürücü Uygulamaları İçin Yüksek Verimli Rezonans Dönüştürücü

Abstract

Bu çalışmada, LED sürücü uygulamaları için yükseltici tipte Darbe Genişlik Modülasyonu (PWM) – rezonans dönüştürücü önerilmektedir. Rezonans çalışma prensibi sayesinde, dönüştürücü çoğu anahtarlama anında sıfır akım anahtarlaması (ZCS) ile çalışmakta ve böylece yüksek verimlilik daha kolay bir şekilde elde edilebilmektedir. Dönüştürücü kapasitif enerji transferi kullanmakta olup, gerekli indüktans boyutunda azalma sağlamaktadır. Bu durum, yüksek güç yoğunluğuna sahip dönüştürücü tasarımlarına olanak tanımaktadır. PWM-rezonans dönüştürücünün çalışma prensibi, statik analiz gerçekleştirilerek ve tasarım kısıtları açıklanarak sunulmuştur. Ana tasarım parametrelerinin belirlenmesine yönelik matematiksel ispat sunulmuş ve diğer bulgularla birlikte deneysel olarak doğrulanmıştır. Dönüştürücünün küçük-sinyal AC modeli türetilmiş ve LED karartma uygulamaları için kapalı çevrim akım kontrolü sağlamak amacıyla Tip II dengeleyici tasarlanmıştır. Dönüştürücü performansının kalıcı durum ve geçici durum koşullarında değerlendirilmesi amacıyla 200W’lık bir PWM-rezonanslı dönüştürücü prototipi gerçekleştirilmiştir. Teorik analiz, deneysel ve simülasyon sonuçlarıyla doğrulanmıştır.

Keywords

• DC-DC güç dönüştürücüleri
• rezonans dönüştürücü
• sıfır akım anahtarlaması
• akım kontrolü

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