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Part 1 - Single-phase Diode Bridge Rectifier - Resistive Load
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Exercise 1: Varying Resistive Load (without smoothing capacitor, C=0)
Open the Single-Phase Diode Bridge Rectifier panel, choose in the menu Pre-Selected: Single Phase: Varying Resistive Load without smoothing capacitor.
Figure 11: Single-Phase Diode Bridge Rectifier Panel with a Resistive Load of 16.5 ohms
Default Parameters
- AC Source Voltage : Ve= 120 V
- Frequency: 60 Hz
- R= 16.5 Ω
Keep the AC Source Voltage to 120 V, observe the waveforms, and calculate the average output current (load current) and fill out table 4 for different values of the resistance R.
R (Ω) | 16.5 | 25 | 50 | 100 | 200 |
---|---|---|---|---|---|
Average load current (A) |
Table 4: Effect of Varying Resistive Load
- Calculate the output frequency and compare it with the input frequency.
- Compare the input current with the output current and the input voltage with the output voltage.
- Deduce the role of the single-phase diode bridge rectifier.
- Justify the shape of the output voltage and output current.
- Calculate the form factor and the ripple factor.
Exercise 2: Varying Resistive Load (with smoothing capacitor)
In the panel, choose under Pre-Selected: Single Phase: Varying Resistive Load with smoothing capacitor.
Figure 12: Single-Phase Diode Bridge Rectifier Panel with R=16.5 ohms and C= 470 µF
Complete tables 5, 6, and 7 for different values of the smoothing capacitor.
Case 1: C= 470 µF
R (Ω) | 16.5 | 25 | 50 | 100 | 200 |
---|---|---|---|---|---|
The maximum peak value of output voltage (V) | |||||
The minimum peak value of output voltage (V) | |||||
Form factor | |||||
Ripple factor | |||||
THD of AC-source Current (%) |
Table 5: Case 1- Varying Resistive Load With Smoothing Capacitor
Case 2: C= 1100 µF
R (Ω) | 16.5 | 25 | 50 | 100 | 200 |
---|---|---|---|---|---|
The maximum peak value of output voltage (V) | |||||
The minimum peak value of output voltage (V) | |||||
Form factor | |||||
Ripple factor | |||||
THD of AC-source Current (%) |
Table 6: Case 2- Varying Resistive Load With Smoothing Capacitor
Case 3: C= 0.1 F
R (Ω) | 16.5 | 25 | 50 | 100 | 200 |
---|---|---|---|---|---|
The maximum peak value of output voltage (V) | |||||
The minimum peak value of output voltage (V) | |||||
Form factor | |||||
Ripple factor | |||||
THD of AC-source Current (%) |
Table 7: Case 3- Varying Resistive Load With Smoothing Capacitor
Now, set R to 25 Ω.
- Compare the values of peak-to-peak output voltages (without and with smoothing capacitor).
- How does the ripple factor increase?
- What’s the relationship between the peak-to-peak output voltage and the resistance (when C is constant)?
- For which capacitor value is the filtering considered more effective?
- For which value of capacitor filtering is the minimum output voltage equal to 10% of the maximum peak value of the output voltage?
- What is the effect of increasing the capacitor filtering on the total harmonic distortion (THD) of the AC-source current?
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