Working of Center Tapped Full Wave Rectifier
The center tapped full wave rectifier is build with a center tapped transformer and two diodes D1 and D2, are connected as shown in below figure. When the AC power supply switched ON, the voltage appearing across the terminals AB of transformer secondary terminal side. During the positive half cycle, the diode D1 is in forward bias and the diode D2 is in reverse bias, it won’t conduct. So the current will pass through the diode D1 and Load (R). During the negative cycle of the secondary cycle, only the diode D2 will conduct and current will pass through the diode D2 and the Load (R).
Why is a Full Wave Bridge Rectifier better than a Full Wave Center Tapped Rectifier?
A bridge rectifier does not require a bulky center tapped transformer, nowadays the center tapped transformers are costlier than diodes and a step-down transformer hence reduced size and cost.
The PIV (peak inverse voltage) ratings of the diodes in bridge rectifier is half than that of needed in a center tapped full wave rectifiers. The diode used in bridge rectifier has capable of bearing high peak inverse voltage. Whereas in center tapped rectifiers, the peak inverse voltage coming across each diode is double the maximum voltage across the half of the secondary winding.
The transformer utilization factor (TUF) also more in bridge rectifier as compared to the center tapped full wave rectifier, Which makes it more advantageous.
PIV (peak inverse voltage) of Bridge Rectifier
PIV: For rectifiers, Peak inverse voltage(PIV) or peak reverse voltage(PRV) can be defined as the maximum value of the reverse voltage of a diode, which occurs at the peak of the input cycle when the diode is in reverse bias.
No comments:
Post a Comment