Activity Building The Full Wave Rectifier Circuit

Now it's time to build the full wave rectifier circuit. To do so you will need all the components you used in the half wave rectifier circuit plus:

Additional Parts Required

(3) 1N4148 diodes

The schematic is shown in Figure 5-22. The parts placement should look like that in Figure 5-23. Examine how the four diodes are inserted into the breadboard.

V Disconnect power to your board.

V Remove the 1000 ^F capacitor for the time being.

V Add the diodes to the circuit, being careful to observe the directions of the diodes' anodes and cathodes.

V When you are confident your wiring is correct, reconnect power.

4-1N4148 ADC0834

4-1N4148 ADC0834

1n4148 Full Wave Rectifier1n4148 Free Energy

Your Turn: Sampling and Displaying the Full Wave Rectifier Voltage Outputs

We will use the same code as we did for the half wave rectifier circuit, which will now take samples of the full wave rectifier output. Once again, the fan should be turning the turbine blades at a reasonably fast rate, and the stator should be securely fastened to a flat surface.

V Re-run Half-FullWaveRectifier.bs2.

V Close the Debug Terminal, bring up StampPlot, and connect.

What follows is the plot of these voltage values using StampPlot as illustrated in Figure 5-24. Once again, our plot used a 12 second time sweep.

Full Wave Rectifier Circuit
Figure 5-24: StampPlot Plot of Full Wave Rectified Voltage Values The equivalent oscilloscope plot is illustrated in Figure 5-25.
Full Wave Rectified Signal Oscilloscope
Figure 5-25: Oscilloscope Plot of Full Wave Rectified Voltage

If you compare these plots to Figure 5-14 and Figure 5-15, respectively, you can see that the full wave rectified output has double the number of peaks as compared with the half wave rectified output. To be consistent in your own comparisons, make sure that the time scale you used for sampling the half wave rectified signal is the same as the one you used to sample the full wave rectified signal.

Your Turn: Adding a Smoothing Capacitor

Once again, let's add a smoothing capacitor to the full wave rectified circuit to see its effect on our full wave rectified voltage output. We'll add the same 1000 ^F polarized capacitor across the load resistor as shown in Figure 5-26.

V Replace the 1000 ^F capacitor as shown in Figure 5-27. Remember the capacitor is polarized so take care to add the capacitor with its + and - leads correctly as illustrated.

4-1N4148 ADC0834

4-1N4148 ADC0834

1n4148 CircuitWave Smoothing Capacitor

You should see something like Figure 5-28.

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Figure 5-28: StampPlot Plot of Smoothed Full Wave Rectifier Output

Figure 5-28: StampPlot Plot of Smoothed Full Wave Rectifier Output

The equivalent oscilloscope plot is in Figure 5-29.

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Figure 5-29: Oscilloscope Plot of Smoothed Full Wave Rectifier Output

Figure 5-29: Oscilloscope Plot of Smoothed Full Wave Rectifier Output

Notice how much smoother the full wave rectified signal is in these plots as compared with the half wave rectified plots in Figure 5-18 and Figure 5-19, respectively. This, of course, is due to the full wave rectified circuit capturing twice as much energy from the AC input wave as compared with the half wave rectified circuit.

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Responses

  • wegahta
    Have wave and full wave rectifier experiment?
    7 years ago

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