DESIGN ANI) CONSTRUC1'ION OF 500'VATT UNINTEl~UPTlB_LE POWEI~ SUPPLY (UPS)

Abstract

Certain types or electrical equipmcnt stich <IS cOlllputcr <llId comlllunication devices arc very critic.1I whell it C()llll~~' tl) lite qu;lIity (II' their power supply. Harmful inlluences like voltage Ilucluatiolls. v"station ill I'requcilcics. clectrical surges and power outage can be vcr disturbing. 1 knee the needs I'm ;1 liPS C;II1IWt be over-emphasised. the liPS must provide AC output such thaI IIIL';IIlS Ill' 1;lill\l'L' is 1I11l1c1l'L'lnl hy lite Imd. This projcd highlights lhe dcsigll ;1I1t! (llIlSlrlll'lioll (lr;1I11l1IiIlIL'l'ruptihk P(l\\'L'I' sllPply. This made possibly by usc or high current scmiconductor FET (131 POLAR) switches that convert AC voltage to till equipment by changing over to an inverted backup D.C voltage in the e\'l:llt or maillS Illilure or other irregularities in the ,~ mains supply. During the process or the circuit designcd ror the UPS, v;lrious 1~lctor such as change over speed, power quality and enieieney were amongst thc various components employed. The pulse obtained /I'om 555 timers Ie ill which the output signal is divided into twu hy the hdp or .I.k. 1,'lip-r!op. This t\Yo sigllal were lIsed to drivc thc switching ein.:uit in the inverter unit. Thc (UPS) units was designed to convert a 12 v d.e 30a max supply to lced a 500watts 240 vae load at 501 Iz.