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Development of Robust Discrete controller for Double Frequency Buck converter

2015; Taylor & Francis; Volume: 56; Issue: 3 Linguagem: Inglês

10.7305/automatika.2015.12.647

1848-3380

S. Vijayalakshmi, Thangasamy Sree Renga Raja,

Analog and Mixed-Signal Circuit Design

AbstractA discrete controller is designed for high efficiency double frequency buck converter. This double frequency buck converter is comprised of two buck cells: one works at high frequency, and another works at low frequency. It operates in a way that current in the high frequency switch is diverted through the low frequency switch. Thus, the converter can operate at very high frequency without adding any additional control circuits. Moreover, the switching loss of the converter remains small. The proposed converter exhibits improved steady—state and transient response with low switching loss. A digital compensator further improves the dynamic performance of the closed loop system. Simulation of digitally controlled double frequency buck converter is performed with MATLAB / Simulink. Experimental results are given to demonstrate the effectiveness of the controller using LabVIEW with a Data Acquisition Card (NI - 9221).Diskretni regulator je projektiran za postizanje visoke efikasnosti silaznog pretvarača s dvostrukom frekvencijom preklapanja. Ovaj silazni pretvarač s dvostrukom frekvencijom preklapanja sastoji se od dvaju ćelija: po jedna za rad na visokim i niskim frekvencijama preklapanja. Regulator funkionira tako da se struja preklapanja na visokim frekvencijama preusmjerava kroz prekidač za preklapanje na niskim frekvencijama. Tako pretvarač može funkcionirati na vrlo visokim frekvencijama bez dodatnih upravljačkih krugova. Štoviše, gubici prekidanja pretvarača ostaju mali. Prikazani pretvarač pokazuje poboljšanja kod odzivu u ustaljenom stanju te u prijelaznim pojavama uz male gubitke prilikom prekidanja. Digitalni kompenzator nadalje poboljšava dinamičke performanse sustava u zatvorenom krugu. Simulacije digitalno upravljanog silaznog pretvarača s dvostrukom frekvencijom preklapanja su provedene korištenjem MATLAB / Simulink-a. Eksperimentalni rezultati su prikazani kako bi se demonstrirala efikasnost regulatora korištenjem LabVIEW-a i kartice za prikupljanje podataka (NI - 9221).Key words: Analog to Digital conversionDigital compensatorDouble frequency (DF) buck converterKljučne riječi: Analogno digitalni pretvaračDigitalni kompenzatorSilazni pretvarač s dvostrukom frekvencijom preklapanja Additional informationNotes on contributorsSubramanian VijayalakshmiSubramanian Vijayalakshmi received AMIE degree in Electronics & Communication Engineering from Institution of Engineers (India), Kolkatta in 1992, Master of Science degree in Information Technology from Bharathidasan University, Tiruchirapalli, and Master of degree in Power Electronics and drives from Anna University, Chennai in 2007 and Ph.D from Anna University, Chennai in 2015. Her research intersests are Discrete controller for DC-DC converters and renewable energy.Thangasamy Sree Renga RajaThangasamy Sree Renga Raja is working as an Assistant Professor in the Department of Electrical and Electronics Engineering, Anna University, BIT Campus, Tiruchirapalli, Tamil Nadu, India. He obtained B.E (Electrical and Electronics Engineering) degree from Manonmaniam Sundaranar University, Tirunelveli in 1998, M. E (Power Systems) from Annamalai University, Chidambaram in 1999 and Ph.D from Anna University, Chennai in 2007. He has published many papers in the field of Power System Engineering. His area of interest includes Power system optimization, Renewable Energy Applications, Energy Conservation Management and Insulation Engineering.