full_wave_rectifier

Components: resistance pn junction diode(IN4007), ac voltage source, connecting probes, grounded terminal Theory: A full wave rectifier circuit produces an output voltage or current which is purely DC or has some specified DC component. Full wave rectifiers have some fundamental advantages over their half wave rectifier counterparts. The average (DC) output voltage is higher than for half wave, the output of the full wave rectifier has much less ripple than that of the half wave rectifier producing a smoother output waveform. A circuit that produces the same output waveform as the full wave rectifier circuit is that of the Full Wave Bridge Rectifier. Positive Half-cycle: During the negative half cycle of the supply, diodes D3 and D4 conduct in series, but diodes D1 and D2 switch “OFF” as they are now reverse biased. The current flowing through the load is the same direction as before. Negative Half-cycle: As the current flowing through the load is unidirectional, so the voltage developed across the load is also unidirectional the same as for the previous two diode full-wave rectifier, therefore the average DC voltage across the load is 0.637V Smax . Parameters: Supply voltage max voltage(Vsmax), supply max current , dc output current , dc output voltage , ac or rms current , efficiency(n=Vdc/ Iac), ripple factor Full wave bridge rectifier Vsmax=15V f= 50 Hz, primary to secondary coil ratio 1:1 and Rl=1 kiloohm Vpp= 15+15=30 Vs max=15 V imax= Vsmax-2*0.7/2*(rf+rl)=15-1.4/20+2000=0.0067ohm idc=2Imax/pie=0.00428amp vdc=Idc*Rl=0.0042*1000=4.28V Irms=Imax/root 2 =0.0047 amp Vrms= irms*rl=0.0047*1000=4.7V ripple factor = Irms/idc=1.0981 efficiency= rl/rf+rl=0.401 Result: The circuits of Full Wave Rectifiers are designed and implemented with the components present in MULTISIM. The input and output waveforms are observed properly. It can be observed that the frequency of input signals and output signals remain same for half wave rectifier.