# Design a Phase Interleaving PFC Buck Boost Converter to Improve the Power Factor

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2 Design a Phase Interleaving PFC Buck Boost Converter to Improve the Power Factor 2 TOPOLOGY It is a two phase interleaving topology of buck boost converter. The main advantage of phase interleaving topology is that the total input current are divided into two phase, resulting in the current rating reduced the current rating of the switching devices. We can use any numbers of switching device as per the requirement of the application in each phase. Fig 1: AC-DC Buck boost converter topology We design the ac-dc buck boost converter of 5Kva capacity. Here we used for switching device in each phase for current sharing purpose, 3 DESIGN ANALYSIS Here the design of the ac-dc buck boost converter of 4.5kw capacity is describing. In this input range is 170V to 270Vac and output is constant 216Vdc voltage, so that 192v lead acid battery can be connected. Minimum input voltage = 170Vac Output power =5KVA = 4.5KW Output voltage = 216 V dc Output current = Load resistance (RL) = = 4500/216 = 20.8A = Input current = 4500/170 = 26.4A Input rms peak current (I p) = 37. 3A = 38A. Total I p =160A Operating frequency = 25 KHz Time period T =1/F =1/25 khz= 40µs, Duty cycle D = = 0.47 We know that the duty cycle (D) = Ton = T * D = 40µs * 0.47 = 19µs.. = 10.3Ω Calculate the inductance using the following formula: L = = / = 228µH So inductance L = 228µH. (with EE-65 core) Output capacitor = 4700µf/450V, ISSN : Vol. 11 No. 2, Nov

3 Preti Tyagi and Sunder Singh The selection of switching device (IGBT) is done on the bases of peak current, collector voltage and operating frequency. According to this requirement we selected the IGBT- K40H1203 whose rating is 40A/1200V and operating at high frequency. 4 SIMULATION RESULT After fixing all these parameters we have simulated the circuit in PSIM software and the results are given below: Fig 2: simulated circuit of PFC buck boost converter Fig 3: Waveform of Output voltage and output current 5 APPLICATION We got satisfactory results from the simulation of the PFC converter circuit. Then we have decided to implement the 4.5kw UPS system with the same. We used this PFC buck boost converter at front end, and the dc output is given to the inverter input. A battery bank of (16 battery) is also connected at the output of ac-dc buck boost converter. The power diagram of the full system is given below: ISSN : Vol. 11 No. 2, Nov

4 Design a Phase Interleaving PFC Buck Boost Converter to Improve the Power Factor Fig 4: circuit diagram of online UPS system with PFC buck boost converter According to this diagram we made the hardware and results are giving later. Here we used IC UCC2063 for controlling the PFC and regulate the output voltage, whose diagram is show in figure.5. Fig 5: Buck Boost PFC Pre Regulator 6 PRACTICAL RESULT OF PFC CONVERTER The following reading are taken to check the performance of the system, and got the maximum efficiency is 93% at almost full load condition. Power factor of system is 0.98 and total harmonic distortion is 7% according to the following reading. 7 CONCLUSION Sr. No. INPUT (AC) PFC OUTPUT(DC) Current Voltage Current Voltage PFC EFFICIENCY % % % In this topology we achieved a power factor 0.98 and total harmonics is 7% with good efficiency. Its performance is better than any other conventional topology. One other advantage is that we did not require separate charger to charge to the ISSN : Vol. 11 No. 2, Nov

5 Preti Tyagi and Sunder Singh battery bank, because we connect the battery bank at the output of the PFC buck boost converter. It provides the regulated dc output even if input voltage varies from 170v to 270 ac. Thus it s an optimal converter in terms of performance, efficiency and provides unidirectional (dc) power. REFERENCES [1] Jugnu Patel, Swapnil Arya, Power Factor Corrector for AC to DC Boost Converter National Conference on Recent Trends in Engineering & Technology May [2] P.L. Gawade, A.N. Jadhav Harmonic analysis of Input Current of Single-Phase PFC Buck Converter International Journal of Engineering Science Invention ISSN (Online): , ISSN (Print): [3] Ningliang Mi, Boris Sasic, Jon Marshall and Steve Tomasiewicz A Novel Economical Single Stage Battery Charger with Power Factor Correction /03/\$17.00 (C) 2003 IEEE. [4] V. D. Rajaji, Dr. P. Siddaiah Power Factor Correction Using PFC Boost Converter International Journal of Engineering Research & Technology (IJERT) Vol. 2 Issue 4, April ISSN: [5] Power factor correction handbook HBD853/D Rev-5 April ISSN : Vol. 11 No. 2, Nov

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