Power Electronics Fundamentals - Multisim Power Components

Overview

The National Instruments Power Electronics Fundamentals series 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.

Table of Contents

  1. Transformers
  2. Switches
  3. Gate Drivers
  4. Passive Components (RLC)
  5. Motors

Multisim is packed with a range of components, the building blocks of any power circuit. This section introduces the major components in greater detail.

 

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Transformers

This component is based on a general model that can be customized for different applications. It is implemented using a conceptual magnetic core and coreless coil building blocks, together with resistors and inductors. Using this transformer, you can model physical effects such as nonlinear magnetic saturation, primary and secondary winding losses, primary and secondary leakage inductances, and core geometric size .The transformer also allows the modeling of multiple windings. The options for configuration and personalization makes Multisim an incredibly versatile tool, introducing students to components and models used widely in industry. 

 

 

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Switches

Multisim’s database include a variety of models for MOSFET and IGBT switches from leading semiconductor manufacturers such as International Rectifier and Texas Instruments. The models are provided by the manufacturer and validated by the Multisim R&D team. Strong relationships are forged between these companies and National Instruments, enhanced by constant communication and trust. These relationships act to continuously improve on Multisim’s database of models, bettering the quality of the product as a whole.

Examples of these switches are under the transistors group in Multisim’s database.

In addition, Multisim includes generic models for MOSFET switches and basic IGBTs. These components model transistors for system-level simulations in case manufacturer models are not available. Some transistors include a body diode which is based on a simple two-line segment I/V curve.

In addition to the MOSFET generic models, Multisim includes models for Silicon Controlled Rectifiers (SCR), and Gate Turn Off (GTO) switches. With these components, you could accurately simulate your AC control or high-power rectification circuit performance.

 

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Gate Drivers

Multisim’s library is updated with a variety of gate driver components necessary for use with any power switches. The most complicated models are from ON Semiconductor and International Rectifier.

 

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Passive Components (RLC)

Parasitic behavior of passive components plays an important role in the performance of power circuits. This is why in Multisim components have been created to model parasitics of resistors, capacitors, and inductors.

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Motors

 

Many engineers working on electro-mechanical systems find it challenging to predict the electric circuit performance with mechanical parts such as DC machines, stepper motors, and induction machines. To complete the power electronic solution commonly used to drive motors that draw very high current or fed by 3-phase generators, Multisim includes components that models for such mechanical parts of the system.

The component group Electro_Mechanical in Multisim’s database contains models for machines, speed sensors, motion controllers, and other parts that could be used for this purpose.

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