PRACTICAL # 04 Half wave rectification

By:Engr.Irshad Raheem Memon

OBJECTIVE

Objective of this practical is to learn that how an AC signal is converted into a pulsating DC signal with the help of rectifier diode.

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.

Figure showing Rectification process

Rectification Continues.. During positive half cycle of input AC signal,

diode is forward biased. During positive half cycle of input AC signal 0.7volt is dropped is across diode and remaining voltage appears across load resistor. During negative half cycle of input AC signal; diode is reverse biased .

and it acts as an open switch; that’s why all input voltage appears across diode and zero volts appear across load resistor as shown in figure 02.

Figure Showing Input & output signal of Rectification process

Coming Towards Objective nowRequired Apparatus Few diodes Breadboard Multimeter Oscilloscope Step down transformer Connecting wire etc.

ProcedurePrepare half wave rectifier circuit on

breadboard as shown in the figure 01 and observe input and output signals on the oscilloscope

Procedure Figure in Multism

FIGURE 01

Result on Oscilloscope of Fig 01 circuit

Half Wave Rectifier using Step Down transformer

FIGURE 02

Step down Voltage & Oscilloscope Result of Fig 02 circuit

OBSERVATIONWith the help of oscilloscope it is observed

that AC input signal is converted into pulsating DC signal as shown in figure 01 & 02.

ANY QUERY ?