AC Voltage Regulators (AC Chopper(

AC Voltage Regulators (AC Chopper (.

AC Cho er : is an AC to AC Converter employs to vary the rms voltage across the load at constant frequency. AC Supply AC Voltage Controller With the Same Frequency (AC Chopper).

AC Chopper voltage control Methods:. I-Phase trol (Delay Angle Control).

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On-off (Olitrol (Integral Cyde Control). . .

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snori Jl A single phase AC voltage regulator as shown in the fig. is supplied from 220Y, 50HL The regulator supplies Idlid with Hennery and Ra10 0. The delay angle for thyristor a A) find out the expression of the rms of the output voltage 2) find the rms of the output voltage h97.ß3 0) dnw the input voltage V, , the output voltage and the load current io.

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Perfornlance Paraxneters: RMS Output Voltage RMS value of load current. sin 2a 2 RMS input supply voltage. Is—I S\RVS) RMS value of input supply current. Output load power Input Power Factor SiRMS) x SiRMS) S (RMS ) sin 20 2 S/RSfS).

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2/31/2012 2 (20/g)Crcpbcee (24 a) A single phase Fall AC voltage regulator as shown in the fig. supplies a series R-L load. The input RMS voltage 120 V at 60 HZ. The load is such that L= 6.5 tnH, R=2.5 Q. The firing angle of thyristors c = 7t/2 and the conduction angle is 130.43 0. Determine The RMS output Vo(rms)• Draw the waveform of the input voltage , the 2- out put voltage and the lead current. with L=O , a =1t./2 deternune the input power factor. 3- b) A single phase AC voltage regulator supplies a pure reactance with 31.8 mH . The input voltage is220 V, 50 HZ, the firing angle a=2/3 it. I-Find the instantaneous expression for the out put current. 2- Find the maximum value of the load current..

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. Perfornxanc-e Pararneters: • RMS Output Voltage RMS ) thc output voltage waveform appears as a continuous sine wave identical to the input supply voltage waveform for trigger angle a and the control on the output is lost. ic • RMS Output Current vo=v ot O(RMS) z we obtain a continuous load current Output load power o Input Power Factor thRSfS).

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