PE_Lab 1.pdf - QUAID-E-AWAM UNIVERSITY COLLEGE OF ENGINEERING SCIENCE&TECHNOLOGY LARKANA SINDH Power Electronics(1st Term Final Year Name Roll

PE_Lab 1.pdf - QUAID-E-AWAM UNIVERSITY COLLEGE OF...

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QUAID-E-AWAM UNIVERSITY COLLEGE OF ENGINEERING, SCIENCE &TECHNOLOGY, LARKANA - SINDH Power Electronics (1 st Term, Final Year) Prepared By Engr. Shahzeb Ansari Name: __________________________________________ Roll # _________________________ Score: _____________________Signature of lab Instructor_________________________________ LAB EXPERIMENT # 01 PERFORMANCE OBJECTIVE: Upon successful completion of this experiment, the student will be able To understand the Voltage-Current characteristics of Silicon Controlled Rectifier by using (a) Kit (b) Multisim EQUIPMENTS: Oscilloscope Multi-meter Power Supply C-20 Kit THEORY: SCR is an abbreviation of Silicon Controlled rectifier. It is also called thyristor which conducts only in one direction. The most important purpose of an SCR is to function as an electrical switch. The SCR is a combination of two transistors (PNP & NPN) and it is a four layer device. An SCR has three junctions J1, J2 and J3 and having three terminals. Three terminals are anode (A), cathode (K) and gate (G). The main function of gate is used to control the voltage until the break-over voltage occurs. SCR can be used in speed control motor, water level alarm and timer circuits. SCR BASIC STRUCTURE: Figure 1.1 shows the SCR symbol and the sectional view of three PN-junctions and the transistor equivalent circuit is shown in figure 1.2. Figure 1.1 SCR Schematic and Sectional View
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  • Fall '18
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