Equipment:
You must make up a complete equipment list and have you instructor review it before you start.
 

Components:

• D1 through D4 - 1N4002
• T1 - 12.6 - 16.0 Volt Center Tapped Transformer
• RL - 16 k Ohm

Objectives:

• To measure the output characteristics of your transformer
• To design, build and safely test a half wave rectifier
• To design, build and safely test a full wave rectifier
• To design, build and safely test a bridge rectifier

1.- Types of Positive Voltage Rectifiers (HW)

a.    Draw and label the following types of positive voltage rectifiers (use ORCAD schematic module):

1. Figure #1 -- Half Wave Rectifier
2. Figure #2 – Full Wave Rectifier and
3. Figure #3 -- Bridge Rectifier.

 

 
 

Note: Please read the textbook in Chapter 3 under "Diode as a Rectifier" to help you design these circuits.

b.    Designate the transformer as T1, the load as RL and the rectifier diodes as D1, D2, D3 and D4.

c.    Using ORCAD, run a transient simulation for each circuit. Plot 5 complete cycles of the Vin and Vout for each circuit.
        NOTE: Transformer Part Name in ORCAD is "XFMR_LIN".  It is under analog.olb library.  You must also
        put values for 3 of its properties.  Go to the properties of XFMR_LIN and put Coupling=0.7, L1=1.45 and L2=0.0318
        You should be able to simulate the transformer after putting number on those three properties.

d.  Indicate in the different regions of each of the output signal plots the function performed by each of the diodes of the
       corresponding rectifier, and any relevant details.
 
 

2.- The Turns Ratio

a.  Transformer Primary Voltage, V1 is given as 110 V_rms.  Use the oscilloscope to measure Transformer Secondary
     Voltage (V2) in rms.

b.  Express the primary voltage (V1) and secondary voltage (V2) in
     i) V_rms
     ii)V_peak
     iii)V_{peak to peak}
     iv)V_avg.

     You can get all the measurement for V2 from the Digital oscilloscope.  V1_peak, V1_{peak to peak} and V1_avg has to be calculated  from V1_rms (NOT by measurement).  Place all information in Table # 1.  Determine the turns ratio (V1/V2) of T1 and place this info in Table #1.
Hint: All the equations to find V_peak, V_{peak to peak} and V_avg can be found from the textbook.

c.  Using digital oscilloscope, print out the Vout of secondary winding (V2). Label this plot Figure A - Unloaded
     Transformer  Secondary Waveform. Then disconnect Transformer from the AC outlet.
 
 
 

3.- Testing Positive Rectifiers

 
1. Construct the circuit of Figure #1. Test the circuit for a possible short to ground with an ohm meter. Correct any wiring errors and test again. Connect T1 to an AC outlet. Measure and print the waveform across RL. Disconnect T1 from the AC outlet! Plot and label the waveform Figure 1A -- Wave Form Across RL In Half Wave Rectifier.

Label the axis and any details in the plot.
 
 
2. Construct the circuit of Figure #2. Test the circuit for a possible short to ground with an ohm meter. Correct any wiring errors and test again. Connect T1 to an AC outlet. Measure and print the waveform across RL. Disconnect T1 from the AC outlet! Plot and label the waveform Figure 2A -- Wave Form Across RL In Full Wave Rectifier.

Label the axis and any details in the plot.
 
 
 
3. Construct the circuit of Figure #3. Test the circuit for a possible short to ground with an ohm meter. Correct any wiring errors and test again. Connect T1 to an AC outlet. Measure and print the waveform across RL. Disconnect T1 from the AC outlet! Plot and label the waveform Figure 3A -- Wave Form Across RL In Bridge Rectifier.

Label the axis and any details in the plot.

4.- Analysis of results

1. Compare the measured results of each type of positive rectifier to those obtained using ORCAD.  Provide explanation if the measured results are different from ORCAD simulation.

 
2. Explain the detail characteristics of each positive rectifier and possible application.  The example of detail characteristic is the different PIV for different rectifiers.

 
3. Which one is better, Full Wave or Bridge Rectifier?  Explain.