Week 3 Lab: Bridge Rectifier

Week 3 Lab: Bridge Rectifier


Week 3 lab is based on the previous lab from week 2 on half-wave and full-wave rectifiers and taking that knowledge to build a bridge rectifier.

Materials and Equipment:


· Simulated Parts (Multisim):

· 10:1 transformer (To access in Multisim under Master Database, in Group > Basic > Transformer > Select 1P1S)

· Two diodes 1N4001

· Two 2.2 kΩ resistors

· One 100 μF, 50 V electrolytic capacitor (any voltage rating is fine since is simulation only)

· One fuse (any rating is fine since is simulation only)


· Virtual Instruments (Multisim):

· Tektronix Oscilloscope

· Agilent Multimeter

· AC Power Source (To access in Multisim under Master Database > Group > Sources > Power Sources > AC_POWER)

Note: Multisim must be configured so a date and time stamp is visible in all simulations. Omission of the date and time stamp causes the lab to be worth only 1%. Please refer to the Procedure to view date and time stamp at the end of the lab.

1. Construct the bridge rectifier circuit shown in Figure 1. Double click the AC_POWER SOURCE and set the voltage value to 30Vrms. Notice that no terminal of the transformer secondary is at ground potential (some simulation software will not run if it is not connected to the ground, check yours). The input voltage to the bridge, VSEC, is not referenced to ground. Be sure to set the tolerance of the resistors to 10%. (Refer to the Tools and Templates section if you do not know how to set tolerances for resistors.)

2. Using the AC Power Source to provide VAC, run the simulation.

3. Use the Agilent multimeter to measure VSEC (rms) and then use the oscilloscope to measure the peak output voltage (VLOAD) without a filter capacitor. Be sure to take screenshots of your measurements showing the equipment, the circuit, the connections to the multimeter, and the date and time stamp.

4. Tabulate all data gathered.


Figure 1

4. Connect the 100 μF capacitor in parallel with the load resistor. Measure VLOAD, the peak-to-peak ripple voltage VRIPPLE, and the ripple frequency. Tabulate all data gathered and compare the results with and without the filter capacitor.


Without the capacitor

With the capacitor

Output load voltage VLOAD



Peak-to-peak ripple voltage VRIPPLE



Ripple frequency



5. Choose a diode among the four connected to the bridge and open it. Simulate an open diode in the bridge and explain what happens to the output voltage, the ripple voltage and the ripple frequency?

6. Investigate the effect of the load resistor on the ripple voltage by connecting a second 2.2 kΩ, 10% tolerance, and load resistor in parallel with RL and C1 in the full-wave circuit of Figure 3. Measure the ripple voltage. Be sure to capture the screenshots for the circuit and measured values with the date and time stamp (see procedure below). When taking screenshots of your measurements, make sure that the circuit is also visible with connections to the equipment. Multiple screenshots may be necessary to demonstrate the circuit setup and the measurements.

Review questions:

1. Explain how you could measure the ripple frequency to determine if a diode were open in a bridge rectifier circuit.

2. What is the maximum dc voltage you could expect to obtain from a transformer with a 3 Vrms secondary using a bridge circuit with a filter capacitor?


1. Follow the template “Lab Report Template” to compile the report, and make sure to check the report against the grading rubric below. The template can be found in the “Tools and Templates” link in the left navigation panel. The template should provide places for you to include the analysis of the circuit/calculations, table, screenshots of the circuit and measurements, and the answer to the questions. Again, be sure the screenshots of the circuit and measurements, including the date and time stamp.

2. Make sure to include the table, calculations, screenshots of the measurements and the answer to the questions. Save the document as Lab2YourGID.docx (ex: Lab3G00000000.docx).

Procedure to view date and time stamp:

On the upper menu of Multisim, click “VIEW” then click “SPREADSHEET VIEW”, click the “SIMULATION” tab on the bottom left of the screen. You will see the screen below with a date and time stamp of your simulation with the circuit design you created.

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