Full Bridge Controlled rectifier

Detailed basics on full-bridge controlled rectifier for R load

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Full Bridge Controlled Rectifier

In full bridge controlled rectifier both positive and negative half cycle is controlled by firing angle.So we need to trigger the scr.

Basic of firing angle control logic is

T1T2----------Fired at alpha, 2pi+alpha, 4pi+alpha...

T2T3----------Fired at pi+alpha, 3pi+alpha 5pi+alpha...

basically its is 30 degree firing from 0 ref for positive cycle , similarly it is 30 degree firing angle from pi for negative half cycle.

Asian Power Frequency is 50Hz(India)

f=50Hz T=1/f=1/50=0.02sec to complete one full cycle

2pi radian=360deg= 0.02sec

Now am choosing firing angle is of 30 deg so firing angle should be

360 deg= 0.02 sec=2pi

180 deg= 0.01 sec= pi

30 deg= X?

alpha in deg alpha in sec

X=Time period to trigger SCR/thyristo

just do cross multiplication

X=(0.02*30)/360=1.6666667*10^(-3)=1/600(which i substitute in the pulse generator delay angle)

alpha in deg alpha in sec

30 deg= 1/600

T1T2---------Firing angle in sec=1/600=alpha in sec

alpha in deg alpha in sec

30 deg= 1/600(delay)(which i substitute in the pulse generator1 delay angle)

T3T4---------Firing angle in sec=pi+alpha=0.01+

alpha in deg alpha in sec

pi+alpha

180+30

210 deg= 7/600(delay)(which i substitute in the pulse generator2 delay angle)

Vm=100

alpha=30 deg

Absorb the waveforms

one who interseted in THD calculation you can use power gui and select FFT analysis