Tutorial-13721-eletronica de potencia - multisim

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Document Type: Tutorial
NI Supported: Yes
Publish Date: Feb 06, 2012

How to Design and Simulate a Brushed DC Motor H-Bridge Circuit Using NI Multisim and LabVIEW
Overview
With NI Multisim 12.0, you can implement the desktop simulation of your entire analog and digital system before prototyping. Digital FPGA controller logic and closed-loop simulation of
transistor-level power electronicscomponents are now possible using the Multisim/LabVIEW cosimulation feature. This tutorial shows how you can use Multisim and LabVIEW 2011 to develop the
analog circuit design and digital control blocks of a brushed DC motor H-bridge circuit. In this article, learn how to use the electromechanical, power electronics, and sensor feedback blocks (new in
Multisim 12.0) to create a closed-loopcontrol system. LabVIEW FPGA IP core development and debugging are briefly described as well. Cosimulation enables codesign of an entire system to
ensure algorithms and code simulated for the FPGA in LabVIEW are verified for performance with analog circuitry and can be directly implemented in hardware with minimal changes. With the
improved Multisim design approach powered by simulation, you canobtain a more accurate understanding of performance earlier in the design flow. The result of this is a reduction in prototype
iterations (up to three saved PCB turns) and accurate embedded code with fewer compiles (saving as much as four hours per compile).
Table of Contents
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Software and Hardware Requirements
Introduction
Technical Background DocumentationDesign Procedure
LabVIEW FPGA IP Cores
Complete System Architecture
Conclusion
References

Software and Hardware Requirements
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Multisim 12.0
LabVIEW 2011
LabVIEW 2011 Control Design and Simulation Module
LabVIEW 2011 FPGA Module
CompactRIO (optional for hardware implementation)

Introduction
With system-level simulation, you can implement point-by-point simulationbetween two separate simulation engines: analog SPICE circuitry and digital logic. This functionality is exclusive to the
Multisim and LabVIEW platform through an approach called cosimulation. Cosimulation allows a unique time-step negotiation between two simulation engines to create a closed-loop simulation of
the complete system. The result is an evaluation of a design that includes all of thesystem dynamics between the analog and digital modules. Multisim, which is optimized for accurate analog and
mixed-signal circuitry, includes a large set of predefined SPICE models from leading semiconductor manufacturers such as Analog Devices, NXP, ON Semiconductor, and Texas Instruments. The
LabVIEW simulation engine is dedicated to the effective design and implementation of control logicthrough a graphical, dataflow representation. This engine provides high-level simulation
optimized for embedded digital code for mechanical systems.

Figure 1. Cosimulation With Multisim and LabVIEW
In this reference design, a complete system simulation of a brushed DC motor H-bridge circuit and the pulse-width modulation (PWM) closed-loop control logic is developed. The DC motor is
modeled andsimulated in Multisim along with the H-bridge transistors and gate drivers. Feedback sensors and quadrature encoding of the motor speed are used to provide LabVIEW with the
feedback signals. In LabVIEW, proportional integral (PI) control logic is performed based on the feedback signals from Multisim, and the PWM control signals are reapplied to the Multisim input
terminals to control the H-bridgetransistor gates. This circuitry regulates the amount of current flowing into the motor. The logic design is simulated using LabVIEW FPGA IP blocks running at 40
MHz.
This tutorial demonstrates an accurate desktop simulation of a prototype before the hardware implementation.
Technical Background Documentation
Learn about these related topics:
LabVIEW and Multisim cosimulation basics...
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