This document is the implementation of circuitry of buck converter (from 24 volt to 12 volt and 0.5A current). For gate pulses of MOSFET (IRF740) we used 555 timer in a-stable mode instead of PIC M...
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DC TO DC BOOST CONVERTER
Buck–boost converter TE – FTIK – UHT
Djogi Lubis Ir, M.A.P
The basic schematic of a buck–boost converter.
The basic schematic of an inverting buck–boost converter.
• The basic principle of the buck–boost converter is fairly simple (see fiure !"# • $hile in the On-state% the input voltage source is directly connected to the inductor (&". This results in accumulatin enery in &. In this stae% the capacitor supplies enery to the output loa'. • $hile in the Off-state% the inductor is connected to the output load and capacitor % so energy is transferred from L to C and R. • ompare' to the buck an' boost converters% the characteristics of the buck–boost converter are mainly# polarity of the output voltage is opposite to that of the input;
*
• the output voltae can vary continuously from ) to (for an i'eal converter". The output voltage ranges for a buck an' a boost converter are respectively ) to Vi an' Vi to
* .
+chematic of a ,uck–,oost converter.
The t$o operatin states of a buck–boost converter# a. -hen the s$itch is turne'on% the input voltae source supplies current to the in'uctor an' the capacitor supplies current to the resistor (output loa'". b. -hen the s$itch is opene' (provi'in enery is store' into the in'uctor"% the in'uctor supplies current to the loa' via the 'io'e /. the characteristics of the buck–boost converter are mainly: 0.polarity of the output voltae is opposite to that of the input1 !.the output voltae can vary continuously from ) to (for an i'eal converter". The voltae for a buck an' a boo respectively to ) an'
ontinuous 2o'e
• -aveforms of current an' voltae in a ,uck–,oost converter operatin in continuous mo'e.