Experiment No. 5 FULL-WAVE RECTIFIERS AND POWER SUPPLIES

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1 Experiment No. 5 FULL-WAVE RECTIFIERS AND POWER SUPPLIES Objective: The objective of this experiment is to study the performance and characteristic of full-wave rectifiers and DC power supplies utilizing Zener diode as a voltage stabilizing device. The performance of the full-wave rectifier will be studied and measured as well as that of the Zener diode. Introduction: One of the important applications of the P-N junction diodes is in converting alternating current (AC) into direct current (DC). Half-wave rectifiers can be used, but they are highly inefficient in converting AC power to DC power. Additionally they have high contents of harmonics, which are difficult to filter out and to smooth out the ripple in the rectified AC power. On the other hand, full-wave rectifier improves on the conversion efficiency of AC power to DC power. It will also reduce the harmonic contents of the rectified waveform and reduce the requirement on the smoothing filter needed to reduce the ripple in the rectified waveform. A typical waveform of a full-wave rectifier is shown in Fig. 1. Fig. 1. Full-wave rectifier output waveforms. The dark line is the filtered output, while the thinner line is the unfiltered output. Zener diodes are special diodes designed to maintain fixed voltages across the load. They are designed to "breakdown" in a reliable and non-destructive way when they are biased in the reverse direction by a voltage higher than the breakdown voltage. A typical DC characteristic of the Zener diode is as shown in Fig. 2. The knee in the reverse bias region in Fig. 2 is the "break down voltage" of the Zener diode. However, this voltage is also known as the Zener voltage.

2 Zener diodes are rated by their breakdown voltage and maximum power. The minimum Zener voltage available is 2.7 V while power ratings of 400 mw and 1.3 W are common. The connection diagram of the Zener diode as a basic voltage regulation circuit is as shown in Fig. 3. Fig. 3. Connection of the Zener diode as a voltage regulator. A complete and stabilized power supply can be obtained by using the rectifier diodes to change the AC power to DC power. The rectified voltage is filtered to reduce the ripple on the rectified waveform. A Zener diode is then used to regulate the voltage to its desired final value. A simple block diagram of a power supply is as shown in Fig. 4. In this block diagram, each individual block is described in more detail below: Transformer: steps down high voltage AC mains to low voltage AC. Diode rectifier: converts AC to DC, but the DC output has large ripple component. Filter: smooth the DC from varying greatly and reduces the ripple component. Voltage regulator: eliminates ripple by setting DC output to a fixed voltage.

3 Load: is the part of the circuit to which the DC power is delivered to perform useful operation. Lab work: Fig. 4. A simple block diagram of regulated DC power supply. 1. Measurement of the DC characteristic of the Zener diode 1.1 Set the DC voltage of the power supply to 0V. 1.2 Connect the Zener diode circuit as shown in Fig Change the DC supply voltage in small steps. Use a digital voltmeter, measure V in, V R, and V D as defined in Fig. 5. Tabulate your measurement data. 1.4 For each step, calculate the DC current through the diode, which is equal to (V R / 2000). 1.5 Reverse the polarity of the DC power supply in Fig. 5. Repeat the measurement steps from 1.1 to 1.4. Fig. 5- Connection diagram for measuring the DC characteristic of the Zener diode.

4 2. Characteristic of the bridge rectifier. 2.1 Connect the full-wave rectifier circuit as shown in Fig. 6 in which R L = 1 kω. Do not connect any capacitor across the load. 2.2 Monitor V o (see Fig. 6) on the oscilloscope. DO NOT monitor V s and V o on the oscilloscope simultaneously. Measure the peak input and peak output voltages. Capture the displayed waveform. Use digital voltmeter, measure the DC voltage across R L. 2.3 Connect 47 µf across R L. Monitor V o on the oscilloscope and capture the waveform. Repeat the measurement with 10 µf capacitor. Compare the two rectified waveforms obtained with the different capacitors. 2.4 Change the load resistor to 10 kω and 100 kω and monitor the rectified voltage at the output. Comment on the impact of the load resistance on the output ripple. Fig. 6. Unfiltered full-wave rectifier using bridge connection of the diodes. 3. Characteristic of the center-tapped full-wave rectifier 3.1 Perform the necessary measurement on the center tapped transformer to determine which lead is the center tap. 3.2 Connect the full-wave rectifier circuit as shown in Fig. 7 in which R L = 1 kω. Do not connect any capacitor across the load. 3.3 Monitor both V s and V o (see Fig. 7) on the oscilloscope simultaneously. Measure the peak input and peak output voltages. Sketch the displayed waveforms. Use digital voltmeter, measure the DC voltage across R L. 3.4 Connect 47 µf across R L. Monitor V s and V o on the oscilloscope and capture both waveforms.

5 4. Regulated DC power supply Fig. 7. Unfiltered full-wave rectifier circuit used in the experiment. 4.1 Consider the DC power supply circuit shown in Fig. 8. Using the previously measured rectified DC voltage, and Zener voltage, calculate the minimum value of R s required to protected the Zener diode under the condition when the load is an open circuit (this is the worst case condition). The Zener diode is rated at 400 mw, and the minimum Zener current is 5mA. Discuss the result with the lab instructor before using it in the experiment. Fig. 8. Regulated DC power supply. 4.2 Connect the circuit shown in Fig. 8 and use the value of R s calculated in 4.1. Monitor the voltage across the load using an oscilloscope. Measure the voltage across R L and the voltage across R s. Calculate the current passing through the Zener diode. 4.3 Disconnect R L and measure the voltage and current across the Zener diode.

6 Results and Discussions: - In addition to the questions posted in the lab procedure, do and answer the following; - Plot the V-I characteristic the Zener diode. - What is the value of the forward resistance of the Zener diode? - What is the Zener voltage?

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