Download EE488P Power Conversion Controlled Half and Full-Wave

EE488P Power Conversion
Controlled Half and Full-Wave Rectifier
Half-wave Resistor-Inductor Load
I . Confirm that the power supply variable voltage control knob is set to zero and that the power
switch is OFF. Build a single-phase half-wave controlled rectifier with a thyristor, inductor, and
resistor.
a. Close the switches (up) for the 300ohm, 600ohm, and 1200 ohm resistors.
What is this load resistance? ___________
b. Use one of the smoothing inductors, 0.2H.
c. Use Single Phase analysis for the Power Analyzer on the AC side.
d. The thyristor module switch is set to 0 (Open)
e. Use the thyristor firing module with the thryristor module. Use the 9-pin connector to
connect them. Use a short white wire to connect the DC knob to the thyristor firing angle input.
Connect the main power supply to terminals 4 and 5, this is the synchronizing signal for firing.
f. Connect the oscilloscope to show: AC side voltage, voltage across the resistor and
inductor, and inductor current.
g. Set the o-scope trigger on AC Line; it will be helpful to choose ACQUIRE and
AVERAGE to smooth the waveforms
h. The isolator/probe power supply should be plugged in and energized
i. Have the instructor verify your setup:______________________
2.
Tum ON the power supply. Adjust the variable voltage control knob until the AC
voltmeter reads 70.71Vrms.
3.
Set the “measure” function on the oscilloscope to display the average and RMS current
and R+L voltage.
4.
Set the scope to measure the power delivered to the RL load. This is mean(V*I). You
probably want to use “math” to create a trace that shows power, and display the mean of that.
5.
Set the firing angle to zero. Observe the response. It should mimic the uncontrolled case.
6.
Set the firing angle to 45 degrees. Observe the behavior.
7.
At 45 degrees firing angle, obtain a stable scope display that maximizes the screen usage
and displays two or three cycles of the waveforms. Sketch the waveforms of the
Inductor+resistor voltage, and the current on the axes provided. LABEL peak and trough values
for each signal.
6.
Firing
Angle
For each firing angle, fill out the chart below
Extinction Vavg
angle
Beta
Vrms
Iavg
Irms
Pdc
(meas)
Pdc
Pac
(calculated) (meter)
Irms^2 * R
0
30
60
90
120
150
7.
Using matlab and the equations from class, draw a curve showing the prediction for each
of the below items, and then on the same figure plot markers for each data point you measured:
•
•
•
•
8.
Average Load voltage
Beta
RMS load current
Load power. Draw a curve as a function of alpha, then plot markers for both
measured DC values (scope calculation and I^2 R method) and the AC power.
Dial the variable voltage control knob down to zero volts and tum OFF the power supply.
Full-wave Resistor-Inductor Load
I . Confirm that the power supply variable voltage control knob is set to zero and that the power
switch is OFF. Build a single-phase full-wave controlled rectifier with a thyristor, inductor, and
resistor.
b. Close the switches (up) for the 300ohm, 600ohm, and 1200 ohm resistors.
What is this load resistance? ___________
b. Use one of the smoothing inductors, 0.2H.
c. Use Single Phase analysis for the Power Analyzer on the AC side.
d. The thyristor module switch is set to 0 (Open)
e. Use the thyristor firing module with the thryristor module. Use the 9-pin connector to
connect them. Use a short white wire to connect the DC knob to the thyristor firing angle input.
Connect the main power supply to terminals 4 and 5, this is the synchronizing signal for firing.
f. Connect the oscilloscope to show: AC side voltage, voltage across the resistor and
inductor, and inductor current.
g. Set the o-scope trigger on AC Line; it will be helpful to choose ACQUIRE and
AVERAGE to smooth the waveforms
h. The isolator/probe power supply should be plugged in and energized
i. Have the instructor verify your setup:______________________
2.
Tum ON the power supply. Adjust the variable voltage control knob until the AC
voltmeter reads 70.71Vrms.
3.
Set the “measure” function on the oscilloscope to display the average and RMS current
and R+L voltage.
4.
Set the scope to measure the power delivered to the RL load. This is mean(V*I). You
probably want to use “math” to create a trace that shows power, and display the mean of that.
5.
Set the firing angle to zero. Observe the response. It should mimic the uncontrolled case.
6.
Set the firing angle to 45 degrees. Observe the behavior.
7.
At 45 degrees firing angle, obtain a stable scope display that maximizes the screen usage
and displays two or three cycles of the waveforms. Sketch the waveforms of the
Inductor+resistor voltage, and the current on the axes provided. LABEL peak and trough values
for each signal.
6.
Firing
Angle
For each firing angle, fill out the chart below
Extinction Vavg
angle
Beta
Vrms
Iavg
Irms
Pdc
(meas)
Pdc
Pac
(calculated) (meter)
Irms^2 * R
0
30
60
90
120
150
8.
Dial the variable voltage control knob down to zero volts and tum OFF the power supply.