Answer to Question #299480 in Electric Circuits for Marcxnator

Question

A transformer steps down 220V Ac to 12V AC. Using suitable circuitsincorporating PN diodes

i.Half wave rectified signal [10]

explain how each of the following signals can be obtained

ii.Full Wave Bridge rectified signal.

Answer 1

Part (1)

A transformer with turn ratio 220:12 (55:3) is used in the circuit to step down 220V to 12V

The diode allows current to flow when terminal A is positive. When A is negative the diode does not allow the current to flow.

The result is half wave rectification.

Part (2)

During the first half cycle A is positive and diode D₁ is forward biased . D₂ is reversed biased

During the second half cycle,B becomes positive and D₂ becomes forward biased .D₁ is reverse biased.

Irrespective of the polarity of input terminal, the current flows through the load resistor R_L resulting to full wave rectification.