*)Introduction :
This laboratory experiment focuses on the three-phase half-wave
rectifier, a fundamental circuit used to convert three-phase
alternating current (AC) into direct current DC). The goal of this
experiment is to analyze the circuit's ) behavior, observe the
output waveform, and calculate the key parameters such as ripple
voltage and average output .voltage
*)Objective :
To understand the operation of a three-phase half-wave
- .rectifier .To measure and analyze the output voltage and
current - To observe the effects of load resistance on the
*) performance Equipment and Materials :
1_) Three-phase AC power supply
2-)Diodes
3- )Resistors
4-) various load values
5-)Oscilloscope
6-) Multimeter
7-) Breadboard or circuit board
8-) Connecting wires
*)Circuit Diagram :
The circuit consists of three diodes connected to a three-phase AC
supply, with the anodes of the diodes connected to each phase
and the cathodes connected together to form the output. The
load resistor
*)Part1
Resstans only
R=33.33Ω
Vm=Vin-0.7
Vm=45-0.7
Vm=44.3V
Vdc=3√3 Vm /2π
Vdc=36.63V
Vrms=0.8407*Vm
Vrms=37.24V
Idc=0.827*44.3/33.3
Idc=1.10A
*)Procedure:
PARMETERS Measured Calculated values
Vdc 33.3V 36.63V
Vrms 33.6V 37.24V
Idc 0.99A 1.10A
Irms 1A 1.11A
Vm 40 45
*(Vin
*(VD
*(Vo
*)part2
(R_L)
Vm=100/500 =1/5 *100 =20Vm
Vm=20V
*)Procedure:
PARMETERS Measured Calculated values
Vm 22v 20v
Vrms 49 45v
Idc 1.5V 5V
Irms 49v 44v
*(Vin
*(VD
*(Vo
*)part3
L=100mH
*)Procedure:
PARMETERS Measured Calculated values
Vm 1 0.9
Vrms 49 45
Idc 1.55 2
Irms 1.5 1
*(Vin
*(VD
*(Vo
*)Procedure :
Setup the Circuit.1
Construct the circuit according to the diagram using - .the
breadboard
Connect the three-phase AC supply to the anodes of - .the diodes
Connect the Load.2
Attach a resistor as the load across the cathodes of the - .diodes :
output waveform on the oscilloscope will display a - series of
positive pulses corresponding to the conduction of each diode
during the positive half-cycles of the AC .supply
*)Analysis :
The average output voltage decreases as the load - .resistance
increases, as expected due to Ohm's law The ripple voltage can be
analyzed by measuring the - peak-to-peak voltage on the
oscilloscope and comparing it .to the average output voltage The
presence of ripple indicates that additional filtering - may be
required for applications needing a smoother DC .output
*)Conclusion :
The experiment successfully demonstrated the operation of a
three-phase half-wave rectifier. Observations ,confirmed that the
circuit produces a pulsed DC output .with measurable average
voltage and ripple effects crucial for its Understanding this
rectifier's behavior is application in various electrical systems,
particularly in industrial and power supply contexts. Future
experiments could investigate the addition of smoothing
capacitors to .reduce ripple voltage and improve output qualit
