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Power electronics lab manual exp 2

Power electronics lab manual exp 2

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s Experiment 2 Switching Characteristics of MOSFETs and Diodes using Power-Pole Board 2.1 Objective The objective of this experiment is to study the switching characteristics of power MOSFETs and power diodes using a buck converter. The circuit will be operated in open loop conditions (no feedback). Our main goal is to understand the switching behavior of these two power devices. 2.2 Preparing the Setup Construct the buck converter circuit as shown in Fig. 2.1 to use the upper MOSFET and lower diode. • Use the BB magnetics board. The inductor is 100 µH. • Use a variable load resistor as a load. • Connect ±12V the signal supply to the DIN connector. Signal supply switch S90 should be OFF. 2.3 Checks before Powering the Circuit • Check the circuit connections as per the schematic. • have your circuit checked by your Lab Instructor 2.4 Powering the Circuit • • Switch ON the signal supply. Check for green LED. • Adjust the duty ratio to 50%. • Set the switching frequency of 100kHz. • Set RL= 12 Ω. Measure and Record the actual resistance value. Apply input voltage Vin of 24 volts form the DC supply. 17 Figure .1: Schematic of Buck Converter IMPORTANT WHEN TAKING MEASUREMENTS: • • • • • When using the differential probe, make sure to coordinate the attenuation factor in the differential probe with the amplification factor on the oscilloscope. When using the BNC cable of the type with “10X” inscribe on it, change the ...
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