Experiment No: Different Diode Circuits

Transcription

1 CODE: DCT/BEC/EXP/ Experient No: Different Dioe Circuits DTE: i pparatus Circuit Diagra STP DOWN TRNSFORMER 1 : To stuy an perfor about the Rectifier Circuits:. Half Wave Rectifier. Full Wave Rectifier : Trainer kit, Power supply, Patch cors, CRO, CRO Probes. D 1 STP DOWN TRNSFORMER 1 D 1 NPUT 30 V 50 Hz C R O/P NPUT 30 V 50 Hz C 0 R C O/P 0 1 D Fig.1 Half wave Rectifier Fig. Full wave Rectifier Theory 1. Half wave Rectifier n positive half cycle of input signal, the ioe is forwar biase so it works in conuction state. Thus input signal will appear at output terinals. n negative half cycle of input signal, the ioe is in reverse biase. So current through the loa is zero. Hence the output voltage is zero.. Full wave Rectifier n positive half cycle of input signal, the ioe is forwar biase an ioe D is reverse biase. So can be reple by short circuit an D can be reple by open circuit. For this conition, output is sae as input. n negative half cycle of input signal, the ioe D is forwar biase an ioe is reverse biase. So D can be reple by short circuit an can be reple by open circuit. For this conition also, output is sae as input. But note that for both the input half cycles, the current through the loa is flowing in the sae irection so the output is positive in both the cases. Proceure 1. Connect the circuit as shown in above iagra. (Fig.1). pply the input voltage fro ains an observe the input an output wavefors. 3. Now connect the capitor filter ross the loa an observe the filtere output wavefor. 4. Change the value of capitor an see the effect on output wavefor. D-CT 1

2 5. Draw the input an output wavefors on the graph an calculate all the paraeters of half wave rectifier. 6. Repeat the above proceure for the full wave rectifier. Calculation [] Half Wave: [B] Full Wave: V V V r 0 R V V R r rs rs V V V R P R M R P R ( ) ( r R ) P rs Efficiency : p η % 100 p ( ) ( r R ) P rs Efficiency : p η % 100 p Ripple Ftor: R f rs 1 Ripple Ftor: R f rs 1 Graph: Conclusion: 1. nput & Output wavefor of half wave rectifier.. nput & Output wavefor of Full wave rectifier. D-CT

3 i pparatus : To stuy an perfor about the Brige Rectifier Circuit. : Trainer kit, Power supply, Patch cors, CRO, CRO Probes. Circuit Diagra STP DOWN TRNSFORMER 1V D 4 D 1 NPUT 30 V 50 Hz C D 3 D 0V 1KΩ 100 µf/ 1000 µf Output To CRO Theory n positive half cycle of input signal, the ioe an D3 are forwar biase an ioe D an D4 are reverse biase. So an D3 can be reple by short circuit an D an D4 can be reple by open circuit. Here the output is sae as input. n positive half cycle of input signal, the ioe an D3 are reverse biase an ioe D an D4 are forwar biase. So an D3 can be reple by open circuit an D an D4 can be reple by short circuit. For this case also, the output is sae as input. Note that for both the input half cycles, the current through the loa is flowing in the sae irection so the output is positive in both the cases. Proceure 1. Connect the circuit as shown in above iagra.. pply the input voltage fro ains an observe the input an output wavefors. 3. Now connect the capitor filter ross the loa an observe the filtere output wavefor. 4. Change the value of capitor an see the effect on output wavefor. 5. Draw the input an output wavefors on the graph an calculate all the paraeters of half wave rectifier. Calculation D-CT 3

4 V V R r rs V R P R ( ) ( r R ) P rs Efficiency p η % 100 p Ripple Ftor R f rs 1 Graph: nput & Output wavefors of Brige rectifier. Conclusion D-CT 4

5 i pparatus : To stuy & perfor about Clipping Circuits: 1. Positive Clipper. Negative Clipper 3. Cobinational Clipper. :P-N Dioe, Trainer Kit, Resistors, Patch cors, DC Power supply, CRO, Function generator. Circuit Diagra 1N4007 1N4007 D V in - 0-5V DC Fig.1 Positive Clipper - 0-5V DC Fig. Negative Clipper - Vref1 Vref Fig.3 Cobination Clipper - Theory 1. Positive Clipper The Clipper which reoves the positive half cycle of the input is known as positive clipper. When V in V ref. : The ioe is ON so Vout V ref. (constsnt) When V in V ref. : The ioe is OFF so Vout V in. Negative Clipper The Clipper which reoves the negative half cycle of the input is known as negative clipper. When V in (-V ref.) : The ioe is OFF so Vout V in When V in (-V ref.) : The ioe is ON so Vout -V ref. (constsnt) 3. Cobination Clipper. Note: (Vref1 > Vref) & Vref1/Vref 0 to 5V. When Vin V ref1 : The ioe is ON & D is OFF so V ref1 (constant) WhenV ref1 V in (-V ref ) : The ioe is OFF & D is OFF so Vin When V in (-V ref ) : The ioe is OFF & D is ON so -V ref (constant) D-CT 5

6 Proceure: 1. Connect the circuit as shown in fig.1.. pply 1 KHz, 10V P-P input signal fr Function generator. 3. Observe the input & Output Wavefors. 4. Draw the input an output wavefor on the graph paper. 5. Repeat the sae proceure for the Negative an Cobinational Clipper circuit. Conclusion: D-CT 6

7 i pparatus : To stuy & perfor about Claper Circuits: 1. Positive Claper. Negative Claper : P-N Dioe, Trainer Kit, Resistors, Capitors, Patch cors, DC Power supply, CRO, Function generator. Circuit Diagra: 10 µf C 10 µf C V i 10V P-P 1N4007 R 100KΩ V i 10V P-P 1N4007 R 100KΩ Fig.1 Positive Claper Fig. Negative Claper Theory: 1. Positive Claper When a claper shifts the original signal in vertical upwar irection, it is known as positive claper. n this, uring negative half cycle, the ioe is forwar biase (ts as a close switch).so the capitor is charge to V. Hence for negative peak of the input, 0. During positive half cycle, the ioe is reverse biase (open circuite) an oes not conuct. The capitor charge to V behaves as a battery an hence V.. Negative Claper When a claper shifts the original signal in vertical ownwar irection, it is known as positive claper. n this, uring positive half cycle, the ioe is forwar biase (ts as a close switch).so the capitor is charge to V. Hence for positive peak of the input, 0. During negative half cycle, the ioe is reverse biase (open circuite) an oes not conuct. The capitor charge to V behaves as a battery an hence -V. D-CT 7

8 Proceure: 1. Connect the circuit as shown in fig.1.. pply 1 KHz, 10V P-P input signal fro Function generator. 3. Observe the input & Output Wavefors. 4. Draw the input an output wavefor on the graph paper. 5. Repeat the sae proceure for the Negative Claper. Conclusion: D-CT 8