Question

DIPLOMA IN ELECTRICAL AND ELECTRONICS ENGINEERING TUTORIAL 4 POWER ELECTRONICS - EE2325 Semester: June 2020 Answer the following questions: 1) Find the RMS and average curent flowing through the heater shown in figwe. The delay angle of both the thyristors is 45°. Draw the input and output voltage waveform. SCRI 1-0 220V SCR2 1 kW, 220V heater ac 2) Draw the circuit diagram of a bridge type cycloconverter used for obtaining the output frequency of fof. 3) Assume that a cycloconverter is supplied from a 120 V (ms), 60 Hz and the load has equivalent resistance of 10 ohm. The output voltage and the frequency that supply the load has to be reduced. If the converters are operated as semiconverters such that 0 Sast and the delay angle is 1/2, with the P-converter allowed to operate for every one complete cycle of input voltage before the N-converter is allowed to take over, determine; 1) ms value of output voltage, Vo, ii) the frequency of the output voltage, fo, the input power factor, PF. 111

Answer 1

Que Given Cyelo converters : SCR, Kr Serg IkW, 220V heater 220V ac a Vinit ) Vm TT OUT at Volt) Vm 57/4 I AJ शा here heater Power 1 kw and Resistance Cez (22012 ole P 1000 R = 2 48.4.

v (arg.) because iz is ac with symmetical. so vons (wt) d (wt) volwa) d (wt) TT a - #l S "(2205a) sin? wt dt TT/4 = 99052 ㅠ I- Cosaat d wt JA q plu - 29059 IT TT-TT JT SiO2wt inza 니 t/m a gol 99012 th 3 IT 4 + I q Sin 2 x IT + sin 2xIT TX2 ۹ Yoona 72 = 990 31 X 4 = 209-76 vot att Q

So arg. Current => TO o Amp. oms Erssent Forms Vorme R 209.77 48.4 Toms 4.334 Amp Aus