buck converter analysis
TRANSCRIPT
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Buck Converter AnalysisRhae Elyxis D. Estanislao#1, Jan Rafael B. Eusebio#2
School of Electrical, Electronics, and Computer Engineering, Mapúa Institute of Technology
Muralla St., Intramuros, Manila 1002 [email protected]
ract — This paper focuses on analysing the basic buck converter
uit by determining the steady state waveform and looking at how
ations in different properties and components affect steady-state
ditions. The effects of the input voltage, duty cycle, connected load,
inductance were among those analysed in order to get a better
erstanding at how buck converters function.
words buck converter, steady-state, input voltage, duty cycle,, inductance
!. ! "R$D%C!$"$ften use& in s'itch()o&e *o'er su**lies +-/, a buck verter is a circuit that 0ste*s &o'n or re&uces the voltae,le 0ste**in u*, or increasin the current. %sually, the si)*lestto re&uce the voltae is to use a linear reulator +such as the
5 !C series/, ho'ever, linear reulators ten& to 'aste too )uch
ry as they &issi*ate excess *o'er as heat, yiel&in to very lo'ciency +less than 678/. $n the other han&, buck converters canhihly efficient, es*ecially those in interate& circuits, 'hichy reach an efficiency of 968 or hiher : a sinificantrove)ent over linear reulators. his ten&s to )ake the) theice for tasks 'here the DC out*ut voltae nee&s to be lo'er
n the DC in*ut voltae, such as the conversion of the )ain
ae of a co)*uter +12(2; C$"
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he circuit sho'n in ?i. 1 is si)ulate& in usin the !-etrixra).
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!n this sub(section, the effect of a&Lustin the &uty cycle'as &eter)ine& in ter)s of the averae voltae an& theri**le voltae. his 'as &one by varyin the &uty cycle fro)178 to 478 in ste*s of 178 'hile )easurin the averae
an& ri**le voltaes across the out*ut. able sho's that asthe &uty cycle is increase&, the averae voltae stea&ilyncreases, fro) a )ini)u) of 93;)< to 4.
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?i.
6.
Current an&