Part One: Intro, Buck converter and single-phase H-bridge inverter circuits

This introductory tutorial video shows a new hands-on switched-mode power supply (SMPS) experiential learning system and curriculum based on the National Instruments ELVIS platform and a 3-phase 6-pack inverter intelligent power module (IPM).

The experimental measurement capabilities of NI ELVIS combine with the new interactive co-simulation environment of LabVIEW and Multisim to create an exciting new platform for learning power electronics. The idea is that through experimentation with the virtual and physical circuits, students can gain an intuitive understanding that's not possible without this type of personal, interaction and experimentation.

Student start by designing their switched-mode power supply (SMPS) circuits at home using co-simulation, then come into the lab and build the physical circuits and compare the results.

The entire SMPS circuit can be built from scratch on the protoboard area using discrete components, or the 3-built in quarter bridge transistor-diode circuits of the 6-pack inverter can be used. If this is the case, the students design and build only the RLC filter stage for their SMPS.

A 10X step-down wall transformer is used to supply the single-phase AC power for the system, resulting in a ~17 Vdc DC Link voltage after passing through the full bridge rectifier circuit on the system. Thus all the voltages are safe to touch. The inverter evaluation board also contains 0.1 Ohm shunt resistors on the bottom of the 3 IGBT quarter bridge legs for current sensing. Resistor dividers are used on the NI ELVIS Digital Electronics FPGA Boards so that all 3-phase voltages (filtered and unfiltered) are measured, along with the Grid Voltage, DC_Link or Neutral Voltage, and input currents. The three-phase power waveforms are then analyzed using the new NI Electrical Power Measurement Suite.

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