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Pretvornik navzdol z razširjenim vklopnim razmerjem
JOVANOVSKI, DAVID (Author), Zajec, Peter (Mentor) More about this mentor... This link opens in a new window

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Abstract
Delo obravnava problematiko učinkovite pretvorbe energije, ki nastopi ob velikem razmerju med vhodno in izhodno napetostjo enostopenjskega pretvornika navzdol. V ospredju obravnave je t.i. pretvornik z razširjenim vklopnim razmerjem, čigar delovanje je doseženo brez uporabe magnetnih komponent – če izvzamemo izhodni dušilki – in posledično brez nezaželenih prenapetosti. Za predlagano topologijo pretvornika s prečnima kondenzatorjema je podana detajlna analiza obratovalnih stanj, ki izpostavlja ugodno napetostno obremenitev močnostnih stikal in zmanjšanje stikalnih izgub ter samodejno porazdelitev prepletenih izhodnih tokov. Za laboratorijski model z izhodnimi podatki 3 V/30 A so podane osnovne smernice dimenzioniranja komponent. Navkljub večjemu številu uporabljenih močnostnih stikal eksperimentalni rezultati potrjujejo pričakovano zvišanje izkoristka pretvornika. Dosežena je tudi enakomerna porazdelitev tokov med izhodnima dušilkama, ki poenostavlja izvedbo regulacijskega vezja.

Language:Slovenian
Keywords:pretvornik navzdol, večvejni pretvornik navzdol, večvejni pretvornik navzdol z razširjenim vklopnim razmerjem, tranzistor, PWM regulator, CPLD vezje.
Work type:Undergraduate thesis (m5)
Organization:FE - Faculty of Electrical Engineering
Year:2015
Views:956
Downloads:356
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Secondary language

Language:English
Title:Buck converter with extended duty cycle
Abstract:
Thesis deals with efficiency of a single-stage buck converter when a large ratio between the input and the output voltage occurs. The emphasis is on so-called converter with extended duty cycle, whose operation is achieved without the use of magnetic components – excluding the output inductors - and consequently without unwanted over voltages. For the proposed topology of converter with two transverse capacitors a detailed analysis of operating conditions is given, highlighting the favourable voltage distribution on power switches and reduction of the switching losses and inherent current distribution among interleaved output branches. Laboratory model with output parameters 3 V/30 A provides basic guidelines for dimensioning of components. Despite the increased number of power switches experimental results confirm the estimated increase of converter’s efficiency. A uniform distribution of currents between two output inductors is also achieved, thus simplifying the implementation of the control circuit, too.

Keywords:buck converter, multiphase buck converter, multiphase buck converter with extended duty cycle, transistor, PWM regulator, CPLD circuit.

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