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ELEC275: Diode Rectifier and Filter - Electrical Engineering Assessment Answer
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Subject Code: ELEC275
Internal Code:1AGFDH
You are expected to look through the whole worksheet before you start working on it. You need make a time plan so that you can complete the work before the session finishes, allowing time for your tutor to mark and sign your logbook.
You are expected to record your initial plan in your logbook and improve your planning skills throughout the semester.
III. LOGBOOKS AND PARTICIPATION MARKS
Participation marks are given to each student at each laboratory session, following the marking rubric published on iLearn. The marks cover preliminary work, attendance, punctuality, positive engagement and logbook recording of each session. All students should have their logbooks signed and dated by their tutor before leaving each laboratory session.
IV. DIODE RECTIFIER AND FILTER
3. Create a schematic of a diode-rectifier circuit in AWR as in Fig. 2. Use the SPICE Diode Model called SDIODE. Note the 50? resistor as the internal resistance of the ac source. Change the value of the load resistor to a practically available one in the laboratory (~5-10 k?). Similarly, adjust the capacitor value to a practical number (~0.1-1 ?F).
4. Analyse and plot the time-domain voltages, one at the output of the signal source, one at the load resistor as in Fig. 3. You may need to use the transient simulator to get good plots of this circuits, depending on the capacitor and resistor values. Notice the frequency of this simulation is 1 kHz.
5. What is the purpose of the capacitor in this circuit? If we want to build a diode rectifier and filter circuit with 1 kHz input (to generate dc from ac); what is the effect of capacitance and load resistance values to the dc output level and ripple? If the load resistor is fixed, should you increase or decrease the capacitance to reduce the ripple?
6. Construct your circuit and measure (observe and record) the voltages you calculated using an oscilloscope.
7. How do the measurements and calculations compare? Do you think your diode model is accurate? Check which diode you used and try to find its datasheet and its SPICE model on the internet. Double click on the diode element in AWR and make the secondary parameters visible.
Correct the relevant values. Re-simulate to see if it helps.
V. DC DIODE CIRCUIT
8. Create a new schematic in AWR to simulate the circuit in Fig. 1. Notice that you need to use a dc voltage source. After you created your schematic, right click on the schematic in your project browser then select “Add Annotation”, then DCIA, then DCVA_N. These two annotations will show the dc voltages and currents of your circuit after you analyse it as shown in Fig. 4.
9. Compare the simulated values to your own calculations using the simple diode model (of the preliminary work). How did the simple diode model work compared to the exponential diode model of AWR?
10. Connect the circuit in the laboratory and measure the dc voltages and currents. Compare to the calculation and simulations and try to explain the differences. Check your results with your tutor and compare them with other students.
Continue with this extension work only if you completed all the previous steps correctly and if you understood them.
11. Simulate the circuit in Fig. 5 in AWR to confirm the solution given in the lecture is correct. What is the
difference between the calculations obtained using the simple diode model and the AWR simulation this time? How do you expect this difference to change from circuit to circuit?
12. Connect and measure the circuit in the laboratory. Notice that you need to pay attention to the polarities of the source connections. Compare your measurements with your calculations.
Electrical Engineering Assessment Answer
TASK: I. PRELIMINARY WORK Before coming to your laboratory session review all the lecture notes on diodes, then solve the following in your logbook. 1. For a junction diode, iD = 0.6 mA is measured when vD = 0.6 V. Calculate the diode current for vD = 0.7 V and vD = 0.8 V if n = 1 and VT = 25 mV. Draw a graph of the diode characteristic (iD vs vD) using the calculated values. 2. Calculate the voltage and current shown in Fig. 1. Use the piecewise linear (constant 0.6V drop) diode model.
You are expected to look through the whole worksheet before you start working on it. You need make a time plan so that you can complete the work before the session finishes, allowing time for your tutor to mark and sign your logbook.
You are expected to record your initial plan in your logbook and improve your planning skills throughout the semester.
III. LOGBOOKS AND PARTICIPATION MARKS
Participation marks are given to each student at each laboratory session, following the marking rubric published on iLearn. The marks cover preliminary work, attendance, punctuality, positive engagement and logbook recording of each session. All students should have their logbooks signed and dated by their tutor before leaving each laboratory session.
IV. DIODE RECTIFIER AND FILTER
3. Create a schematic of a diode-rectifier circuit in AWR as in Fig. 2. Use the SPICE Diode Model called SDIODE. Note the 50? resistor as the internal resistance of the ac source. Change the value of the load resistor to a practically available one in the laboratory (~5-10 k?). Similarly, adjust the capacitor value to a practical number (~0.1-1 ?F).
4. Analyse and plot the time-domain voltages, one at the output of the signal source, one at the load resistor as in Fig. 3. You may need to use the transient simulator to get good plots of this circuits, depending on the capacitor and resistor values. Notice the frequency of this simulation is 1 kHz.
5. What is the purpose of the capacitor in this circuit? If we want to build a diode rectifier and filter circuit with 1 kHz input (to generate dc from ac); what is the effect of capacitance and load resistance values to the dc output level and ripple? If the load resistor is fixed, should you increase or decrease the capacitance to reduce the ripple?
6. Construct your circuit and measure (observe and record) the voltages you calculated using an oscilloscope.
7. How do the measurements and calculations compare? Do you think your diode model is accurate? Check which diode you used and try to find its datasheet and its SPICE model on the internet. Double click on the diode element in AWR and make the secondary parameters visible.
Correct the relevant values. Re-simulate to see if it helps.
V. DC DIODE CIRCUIT
8. Create a new schematic in AWR to simulate the circuit in Fig. 1. Notice that you need to use a dc voltage source. After you created your schematic, right click on the schematic in your project browser then select “Add Annotation”, then DCIA, then DCVA_N. These two annotations will show the dc voltages and currents of your circuit after you analyse it as shown in Fig. 4.
9. Compare the simulated values to your own calculations using the simple diode model (of the preliminary work). How did the simple diode model work compared to the exponential diode model of AWR?
10. Connect the circuit in the laboratory and measure the dc voltages and currents. Compare to the calculation and simulations and try to explain the differences. Check your results with your tutor and compare them with other students.
Continue with this extension work only if you completed all the previous steps correctly and if you understood them.
11. Simulate the circuit in Fig. 5 in AWR to confirm the solution given in the lecture is correct. What is the
difference between the calculations obtained using the simple diode model and the AWR simulation this time? How do you expect this difference to change from circuit to circuit?
12. Connect and measure the circuit in the laboratory. Notice that you need to pay attention to the polarities of the source connections. Compare your measurements with your calculations.
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