Power Electronics Fundamentals: DC to AC Power - Inverters

Publish Date: Nov 05, 2013 | 5 Ratings | 4.40 out of 5 | Print | Submit your review


The National Instruments Power Electronics Fundamentals series is designed to provide an overview of power electronics concepts used in research and taught throughout worldwide institutions.

Using advanced simulation models and analyses used in industry, but wrapped in an intuitive, pedagogical environment Multisim enables students to characterize power circuits concepts before the laboratory.

The power capabilities of Multisim means that students have access to the same technology that they will use for research and industry to prototype power electronics circuit designs. However in learning power electronics in a simulated environment optimized for education, students have the ability to experiment safely before the laboratory.

1.     Three Phase Inverter




Electrical power inversion is the process of converting DC voltages into AC power sources. This is most commonly used when supplying AC power from DC sources such as batteries and DC power supplies. This can be achieved using Switching and Control circuits to produce a signal of the required amplitude and frequency. Multisim allows the modelling of the circuit and PWM signal, so that the required output can be generated.

This is most commonly achieved by a three-phase inverter, which is essentially the combination of three single phase converters. The switch operation of a three-phase inverter is controlled so that they act at each 60 deg point of the output waveform. In the example below we have used a three-phase PWM supply to generate PWM signals at the required phase.


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2. Transient Analysis

NI Multisim comes with a range of pre-built analysis models. The transient analysis allows us to understand the operation of the inverter and how this leads to the development of the AC signal.




The analysis models built into Multisim allows for the characterization of circuits ensuring the optimum circuit design is chosen. The analysis results are based on the industry standard SPICE simulation models, more details of which can be found within the SPICE Simulation Fundamentals Whitepaper series.

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