17-11-2012, 06:11 PM
HALF WAVE RECTIFIER
HALF WAVE RECTIFIER.docx (Size: 197.23 KB / Downloads: 173)
THEORY:
During positive half-cycle of the input voltage, the diode D1 is in forward bias and
conducts through the load resistor R1. Hence the current produces an output voltage across
the load resistor R1, which has the same shape as the +ve half cycle of the input voltage.
During the negative half-cycle of the input voltage, the diode is reverse biased and there is no current through the circuit. i.e., the voltage across R1 is zero.
The net result is that only the +ve half cycle of the input voltage appears across the
load. The average value of the half wave rectified o/p voltage is the value measured on dc
voltmeter. For practical circuits, transformer coupling is usually provided for two reasons.
1. The voltage can be stepped-up or stepped-down, as needed.
2. The ac source is electrically isolated from the rectifier. Thus preventing shock hazards
in the secondary circuit.
PROCEDURE:
1. Connect the circuit as shown in the given circuit diagram without filter capacitor.
2. Measure the value of by removing the load(DRB).
3. Connect the load and measure for different values of load current by varying the resistance in DRB.
4. Connect the capacitor filter and repeat the above steps 2 and 3.
5. Also observe and sketch the input wave form and output wave form of the half wave rectifier with and without filter using CRO.
6. Using the formulae, calculate the values of ripple factor and voltage regulation.