You have to tuck in your shirts or wear an overcoat. You have to wear shoes compulsorily and stand on mats made by insulating materials to electrically isolate your body from the earth.
Laboratory should be treated as temple, which will decide your life. Go to the respective worktable and start to give connection as per the circuit diagram from source side.
Make series circuit connections before the parallel circuits like voltmeter connections. Before switch on the power, get circuit connection approval from the staff in charge. If staff permits you then precede your experiment. Note all the required readings in their respective tables. Note all the wave forms from the CRO. Draw the necessary graphs and write the result with reference. Get verification of observation and calculation from your staff in charge. It will be very useful for future reference.
So keep it as follows. Write neatly; as they have to be preserved enter the readings in the record notebook those have been written in your observation.
Units should be written for all quantities. Draw necessary graphs and complete the record before coming to the next lab class. Device ratings should be noted. Moving coil meters should be used for DC measurements. Moving iron meters should be used for AC measurements. Use isolated supply for the CRO. Use attenuation probe for high voltage measurements in CRO. Muthayammal Engineering college, Rasipuram.
Name of the experiment Page No. The initial set gate current should be taken as minimum in order to take the consecutive readings. Maximum anode current, anode-cathode voltage and gate current limit is mA, 30V and 20mA respectively 3. Before setting each gate current, keep the Anode to cathode voltage VAK as zero. Connections are made as per the circuit diagram. Switch on the V AC supply through three-pin power chord. Keep the gate current IG to a suitable value say minimum of 4 mA to 5mA 4.
Now slowly increase the anode-cathode voltage VAK by varying the pot till thyristor get turned on, with the indication that anode cathode voltage decreases to it on state voltage drop i. Note the values of voltmeter VAK which is the break over voltage and the ammeter I L which is the latching current value. Further, increase the anode current in steps by varying the anode-cathode voltage and note the readings. Now reduces the anode cathode voltage VAK till the thyristor turned off and find the holding current.
For various gate current take the readings and tabulate it. Finally, a graph of anode current Vs anode-cathode voltage is plotted for various gate current. Switch on the triggering circuit 3. Switch on the 24V AC supply 4. By varying potentiometer, vary the firing angle of the converter in order to vary the output voltage step by step. For each step note down the firing angle, output voltage and load current. The output voltage is theoretically calculated for each step and the readings are tabulated.
What is power electronics? What are the types of converter in power electronics? What is latching and holding current? What is break over voltage? What is forward bias and reverse bias? What is firing angle? Why the negative voltage is not possible in semi converter? What is freewheeling diode? C phase controller for illumination control Muthayammal Engineering college, Rasipuram.
The initial set gate current should be taken as the value, for gate current for the consecutive readings. Maximum triac current, voltage across the triac and gate current limit is mA, 30V and 20mA respectively. Now reduces the anode cathode voltage VAK till the triac turned off and find the holding current. Repeat the same procedure from 2 to 8 Finally, a graph of anode current Vs anode-cathode voltage is plotted for various gate current for forward and reverse biases.
Single-phase A. C phase controller for illumination control 1. Switch on the V, 50 Hz AC supply 3. By varying potentiometer, vary the firing angle of the converter in order to vary the output voltage there by the illumination of the lamp will be varied.
For each step note down the firing angle, ammeter reading, voltmeter reading and the output voltage waveform from and tabulate it. Finally, the output voltage waveform is plotted and the theoretical RMS voltage is calculated. C phase controller S. What is bidirectional device? What is bipolar device? What are the applications of phase controlled converter in home appliances? What is the number and range of given triac?
What type of firing is used here? How do you change the firing angle? Draw the symbol of Triac. Connections are made as per the circuit diagram 2. Now slowly increase the drain-source voltage VDS by varying the pot till MOSFET get turned on, with the indication that drain-source voltage decreases to it on state voltage drop.
For various gate-source voltage take the different set of readings and tabulate it. Keep the Drain - source voltage VDS to a suitable value 4. What is current control device? What is voltage control device? What is Transconductance? How to find the output resistance?
What is the number and range of given IGBT? Draw the symbol of IGBT? Blocks Type Items Quantity 1 Simulink i. Sink Scope 1 ii. Measurements MC Voltmeter 1 ii. Power electronics - SCR 1 iV. Connections are made as per the circuit diagram by taking the required items from the corresponding blocks. Now simulate the circuit. The graph of Gate pulse, Drain current and drain to source voltage can be shown. The graph of Gate pulse, Anode current and anode to cathode voltage can be shown. What is a transient characteristic?
What is commutation? Where the natural commutation is not possible in SCR? Connections are made as per the circuit diagram for R load 2. Switch on the triggering kit 3. Switch on the V AC supply 4. Switch on the debounce logic 5. By varying potentiometer vary the firing angle of the converter in order to vary the output voltage step by step. Repeat the same procedure for RL load. What is inversion mode of operation? When we connect a freewheeling diode in full converter, what will be the output?
Why the inversion mode is not possible in semi converter? Why the power factor of full converter is lower than semi converter? Connections are made as per the circuit diagram for RL load 2. What is active load? Is a separate freewheeling diode necessary for semi converter? Justify your answer. Switch on the RPS and turn on triggering kit 3. Switch on the debounce logic 4. By changing the width of the pulse, obtain the different set of reading.
For each step note down the duty cycle, output voltage and load current and tabulate it. The output voltage is theoretically calculated. Details if other :. Thanks for telling us about the problem. Return to Book Page. Get A Copy. Paperback , pages. More Details Original Title. Friend Reviews. To see what your friends thought of this book, please sign up. To ask other readers questions about The Science of Electronics , please sign up.
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