PRACTICAL # 06

Bridge full wave rectification. By:Engr.Irshad Rahim Memon

OBJECTIVE

• Objective of this practical is to learn that how a full cycle of input AC signal is converted into a pulsating DC signal with the help of bridge diode circuit.

Some Concept Regarding Diode & Rectification

• Diode is a two terminal semiconductor device with an ability to conduct current only in one direction after a certain amount of voltage called barrier potential is applied to it in a proper way.

Coming Towards Rectification..

• What is Rectification

Rectification is a process of conversion of AC signal into a pulsating DC signal. Half wave rectifier is able to convert only half cycle of AC signal into pulsating DC signal. Circuit for half wave rectifier is shown in figure 01.

How Full Wave Bridge Diode performs Rectification?

• 1st step Figure 1(a)

Full Wave Bridge Rectification Continues..

• During positive half cycle of input AC signal, diodes D1 & D2 are forward biased and diodes D3 & D4 are reverse biased as shown in figure 1 (a).

Full Wave Bridge Rectification Continues..

• 2nd Step Figure 1(b)

Full Wave Bridge Rectification Continues..

• During negative half cycle of input AC signal, diodes D3 & D4 are forward biased and diodes D1 & D2 are reverse biased as shown in figure 1 (b), which means rectified output is obtained during both positive and negative half cycle of input AC, whereas amplitude of full wave center tapped rectified output signal is Vp(sec)-1.4 volts.

Figure Showing Input & output signal of Full Wave Bridge Rectification process

Coming Towards Objective now

Required Apparatus

• Bridge Rectifier• Breadboard• Multimeter• Oscilloscope• Step Down Transformer• Connecting Wire etc.

Procedure

• Prepare full wave bridge rectifier circuit on breadboard as shown in the figure 01 and observe input and output signals on the oscilloscope.

Procedure Figure 01 in Multism

D1

1B4B42

1

2

4

3

T1

TS_POWER_10_TO_1

R1

1kΩ

XSC1

A B

Ext Trig+

+

_

_ + _V1

220 Vrms 50 Hz 0°

FIGURE 01

Result on Oscilloscope of Fig 01 circuit

OBSERVATION

• With the help of oscilloscope it is observed that AC input signal is converted into pulsating DC signal as shown in figure 02.

ANY QUERY ?