• Pudi sowjanya
• K.S.Ravi kumar
• Dr V V Sastry
• Dr A Pandian

This paper presents two cases of bidirectional isolated dc/dc converters.First one snubberless current fed half bridge converter and other one is 3 phase bidirectional DC-DC Dual Active bridge converter. By using snubberless current fed half bridge converter voltage clamping can be achieved on secondary side modulation which eliminates the need of snubber or active clamp also zero current switching is obtained at primary side .They provide smooth operation, the diodes across switches automatically turned off. So it can reduce switching transmission losses. voltage is increased to 5 times (Dmax=0.8) ,whereas active clamp converter can increase the voltage 4 times with the same value. This converter maintains Zero current Switching turn off of primary device and ZVS turn on of secondary device during the large variation in input voltage and output power conditions without using any extra circuitry .Also In this topology peak current through primary device and high frequency KVA rating of transformer voltage across primary devices can reduce. Another one is DAB. It consists of single phase and three phase and structure of half bridge or full bridge topology. Compared to other converters DAB has smooth power transfer capability and mostly used in high power applications. Advantages of DAB is bidirectional power flow, high power density, isolation and low component stress. These both cases can use in PV system

Current fed converter(CFHB) ,soft switching, ZCS, ZVS, Dual active bridge (DAB), Photo voltaic (PV)

"ANALYSIS,DESIGN AND SIMULATION OF ISOLATTED BIDIRECTIONAL DC-DC CONVERTERS ", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.6, Issue 6, page no.299-309, June 2019, Available :http://www.jetir.org/papers/JETIR1906K35.pdf

"ANALYSIS,DESIGN AND SIMULATION OF ISOLATTED BIDIRECTIONAL DC-DC CONVERTERS ", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.6, Issue 6, page no. pp299-309, June 2019, Available at : http://www.jetir.org/papers/JETIR1906K35.pdf