HALF WAVE AND FULL WAVE RECTIFIER CIRCUITS
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1 FAKULTI KEJURUTERAAN MEKANIKAL UNIVERSITI TEKNOLOGI MALAYSIA KAMPUS SKUDAI JOHOR SKMM 2921 ELECTRIC LABORATORY EXPERIMENT-2 HALF WAVE AND FULL WAVE RECTIFIER CIRCUITS Prepared by: 1. Dr. Bambang Supriyo Approved by: Head of Department Name: Signature and Stamp: Signature and Stamp: Date: Date: 1
2 I. PRELIMINARY EXERCISE Important Note: You are required to do this BEFORE the lab session 1. Search in the various literature sources, at least five (5) sources, (book, journal, proceeding, conference paper or internet) and write short introduction, basic theory of diode, half wave rectifier circuit and 4-diode full wave rectifier circuit. 2. Describe how half wave rectifier circuit and 4-diode full wave rectifier work. 3. Write down relationship between peak, root mean square (rms) and average (DC) values of half wave and full wave rectified sinusoidal signal. 4. For load resistor and capacitor, write down average (DC) values of half wave and full wave rectified sinusoidal signal output related to both output frequency and peak-to-peak ripple voltage. 5. List down your literature sources and use as Reference in your Laboratory Short Report. 2
3 II. EXPERIMENT Half Wave and Full Wave Rectifier Circuits 1. Aims: a. To build a half wave and full wave rectifier circuits b. To measure and record their voltages and output curves. LAB SHEET-Experiment-2 c. To investigate the influence of load resistor and capacitor on the output voltage. 2. Equipments No. Quantity Item Code 1 1 Rastered socket panel Bridging plug Connecting lead, red, 25 cm Connecting lead, blue, 25 cm Connecting lead, red, 50 cm Connecting lead, blue, 50 cm Resistor 100 Ω 8 4 Diode BY Resistor 1 kω 10 1 Capacitor 100 uf / 40V 11 1 Capacitor 470 uf / 40V 12 1 Capacitor 1000 uf / 40V 13 2 Multimeter (Voltmeter) 14 1 AC Power Supply (12Vac, CT [0 V]) 15 1 Dual Channel Oscilloscope 16 2 Cable probe oscilloscope 3. Procedure Precaution: Make sure the AC power supply switch is turned off before starting the experiment. Initial set up: please make sure that the oscilloscope has been correctly set for amplitude, frequency and zero volt adjustments. Set the oscilloscope switches as follows: MODE : - CH1 (Channel 1) for single channel; DUAL for two channels VERTICAL : VOLTS/DIV = 5 V HORIZONTAL : TIME / DIV = 2 ms 3
4 Input Coupling : AC for AC measurement, GND for 0 V and DC for DC measurement. TRIGGER MODE : AUTO; TRIGGER SOURCE : CH1 a. Half Wave Rectifier Circuit with Load Resistor 1. Set up the experimental circuit as shown in Figure 1. AC POWER SUPPLY ON Power Switch OFF DC VOLTMETER (V DC ) CT 12 Vac COM V Diode OSCILLOSCOPE CH1 CH2 Resistor Figure Select 12 Vac and Center Tap (CT= 0 Vac) from the AC power supply as the input voltage. 3. Use Resistor 1 kω as a load resistor. 4. Check carefully to ensure that the circuit connection is correct. 5. Turn on the oscilloscope switch and the AC power supply switch. 6. Measure the output voltage across the output resistor using DC voltmeter (V DC ), and record in Table Draw the input and output voltage curves displayed on the Oscilloscope. 8. Record the input peak voltages (V PI ) and output peak voltages (V PO ) in Table Turn off the AC power supply switch and the oscilloscope switch. 4
5 b. Half Wave Rectifier Circuit with Load Resistor and Capacitor 1. Set up the experimental circuit as shown in Figure 2. LAB SHEET-Experiment-2 AC POWER SUPPLY ON Power Switch OFF DC VOLTMETER (V DC ) CT 12 Vac COM V Diode OSCILLOSCOPE Resistor Capacitor CH1 CH2 Figure Select 12 Vac and Center Tap (CT= 0 Vac) from the AC power supply as the input voltage. 3. Use Resistor of 1 kω as a load resistor and Capacitor of 100 uf as a load Capacitor. (Warning : beware of capacitor polarity. Make sure the positive pin is connected to the positive voltage of load resistor and the negative pin is connected to the lower voltage of load resistor [0 V]) 4. Check carefully to ensure that the circuit connection is correct. 5. Turn on the oscilloscope switch and the AC power supply switch. 6. Measure the output voltage across the output resistor using DC voltmeter (V DC ). 7. Draw output voltage curves displayed on the Oscilloscope. 8. Turn off the AC power supply switch 9. Repeat step (b.3) to (b.8) for Capacitor of 470 uf and 1000 uf, respectively, record in Tables 2. 5
6 10. Repeat step (b.3) to (b.8) for Resistor 100 Ω and Capacitor of 470 uf. Record in Table Repeat step (b.3) to (b.8) for Resistor 10 kω and Capacitor of 470 uf. Record in Table Turn off the oscilloscope switch c. Full Wave Rectifier Circuit with Load Resistor 1. Set up the experimental circuit as shown in Figure 3. AC POWER SUPPLY ON Power Switch OFF DC VOLTMETER (V DC ) CT 12 Vac COM V c OSCILLOSCOPE CH1 CH2 Resistor a b d Diode Figure Select 12 Vac and Center Tap (CT= 0 Vac) from the AC power supply as the input voltage. 3. Use Resistor 1 kω as a load resistor. 4. Check carefully to ensure that the circuit connection is correct. 5. Turn on the oscilloscope switch and the AC power supply switch. 6
7 6. Measure the output voltage across the output resistor using DC voltmeter (V DC ), and record in Table Connect the probe channel1 (CH1) to points a and b as shown in Figure 3, to obtain the input voltage curve. 8. Connect the probe channel1 (CH1) to points c and d as shown in Figure 3, to obtain the output voltage curve. 9. Draw the input and output voltage curves displayed on the Oscilloscope. 10. Record the input peak voltages (V PI ) and output peak voltages (V PO ) in Table Turn off the AC power supply switch and the oscilloscope switch d. Full Wave Rectifier Circuit with Load Resistor and Capacitor 1. Set up the experimental circuit as shown in Figure 4. AC POWER SUPPLY ON Power Switch OFF DC VOLTMETER (V DC ) CT 12 Vac COM V OSCILLOSCOPE CH1 CH2 Capacitor Resistor Diode Figure 4. 7
8 2. Select 12 Vac and Center Tap (CT= 0 Vac) from the AC power supply as the input voltage. 3. Use Resistor of 1 kω as a load resistor and Capacitor of 100 uf as a load Capacitor. (Warning : beware of capacitor polarity. Make sure the positive pin is connected to the positive voltage of load resistor and the negative pin is connected to the lower voltage of load resistor [0 V]) 4. Check carefully to ensure that the circuit connection is correct. 5. Turn on the oscilloscope switch and the AC power supply switch. 6. Measure the output voltage across the output resistor using DC voltmeter (V DC ), 7. Draw output voltage curves displayed on the Oscilloscope. 8. Turn off the AC power supply switch 9. Repeat step (d.3) to (d.8) for Capacitor of 470 uf and 1000 uf, respectively, record in Table Repeat step (d.3) to (d.8) for Resistor 100 Ω and Capacitor of 470 uf, record in Table Repeat step (d.3) to (d.8) for Resistor 10 kω and Capacitor of 470 uf, record in Table Turn off the oscilloscope switch. 8
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