AN INVESTIGATION OF THE EFFECT OF OPERATION MODES ON EFFICIENCY IN MULTIPHASE MICROCONTROLLER BASED SYNCHRONOUS BUCK CONVERTER

Öz

Recently, it has become important to use energy efficiently due to the rapidly increasing energy consumption and the decrease in energy resources. Today, most of the electronic devices such as cars, mobile phones, heater units, battery chargers, LED drivers have power converters inside. In this work, a study has been carried out to increase the efficiency of the multi-phase synchronous buck converter circuit. Four identical synchronous buck converters are used in the circuit. The control of the circuit is made with the help of microcontroller. Efficiency values were examined for two operating modes, fixed and variable. At the same time, efficiency values were determined for the change of active phase number, switching frequency and load current parameters of the circuit. After examining the values and operating points of the measurements taken and determining the optimum operating condition for each load situation, the number of active phases in variable load condition and the switching frequency to be operated are decided by adding them to the control algorithm. Thus, it is ensured that the circuit operates at maximum efficiency under all load conditions without using additional elements in the circuit and without increasing the circuit cost.

Anahtar Kelimeler

• Buck Converter
• Synchronous Converter
• Microcontroller
• Multi-phase

ÇOK FAZLI MİKRODENETLEYİCİ TABANLI SENKRON DÜŞÜRÜCÜ DÖNÜŞTÜRÜCÜDE ÇALIŞMA MODLARININ VERİME ETKİSİNİN İNCELENMESİ

Öz

Son zamanlarda hızla artan enerji tüketimi ve enerji kaynaklarının azalması nedeniyle enerjiyi verimli kullanmak önemli hale gelmiştir. Günümüzde arabalar, cep telefonları, ısıtıcı üniteler, akü şarj cihazları, LED sürücüleri gibi elektronik cihazların çoğunun içinde güç dönüştürücüleri bulunmaktadır. Bu çalışmada, çok fazlı senkron düşürücü dönüştürücü devresinin verimini artırmak için bir çalışma yapılmıştır. Devrede birbirine eş dört adet senkron düşürücü dönüştürücü kullanılmıştır. Devrenin kontrolü mikrodenetleyici yardımı ile yapılmıştır. Sabit ve değişken olmak üzere iki çalışma modu için verim değerleri incelenmiştir. Devrede aynı zamanda aktif faz sayısı, anahtarlama frekansı ve yük akımı parametrelerinin değişmesi durumunda verim değerleri tespit edilmiştir. Alınan ölçümlerin değerleri ve çalışma noktaları incelendikten ve her bir yük durumu için optimum çalışma koşulu belirlendikten sonra, kontrol algoritmasına eklenerek değişken yük durumda aktif faz sayısı ve çalışılacak anahtarlama frekansına karar verilmiştir. Böylece devrede ilave eleman kullanmadan ve devre maliyetini arttırmadan devrenin tüm yük koşulları altında maksimum verimde çalışması sağlanmıştır.

Anahtar Kelimeler

• Düşürücü Dönüştürücü
• Senkron Dönüştürücü
• Mikrodenetleyici
• Çok Fazlı

Kaynakça

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