3582278881

POWER ELECTRONICS LAB. EED

Circuit Diagram :

s

Procedurę:

1.    Connect the input supply to the trainer module

2.    Connect one end of the load rheostat to A of the SCR

3.    Connect the otlier end of the load rheostat to P terminal of 24V AC supply

4.    Connect G| &. K] terminals of UJT firing Circuit to G & K of SCR

5.    Switch ON tlte supply. Power ON/OFF switch. 24V ac Switch. Supply to CRO

6.    Observe the waveform for input AC voltage &. PuLsating DC voltage

7.    Obsenre the Zener diodę vohage( T₄) & capacitor vohage (T₅)

8.    Plot tli e wa ve form s

9.    Repeat the e.\periment for various firing angles Ohservation Tahle:

Vrms	T(mscc)	t (msec)	(l (degrees)	Votmea.su red)	Vo(cal) Vm =-(l+cosa) V 2n_ .
25.8	3.2	0.4	O 10.78	10.99	11.5

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