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Issue #217 August 2008

Subcategory Winner - Microchip 2007 Design Contest
INTELLIGENT ENERGY SOLUTIONS
Electric Vehicle Inverter Design
Build A System For Powering AC Induction Motors
by Dan Hall, Tristan Kasmer, Doug Krahn, Adam McIntyre, and Dena Ponech

Start | Power Inverter | Gate Drivers | Control Board | Space Vector Modulation | PID Tuning | Altering Motor Control Parameters | HMI | Protocol | Firmware/Software | Sources & PDF

HMI

The human machine interface (HMI) for this project is a LabVIEW 7.1 application built to communicate with the controller area network (CAN) bus module over “serial- over-USB” protocol by Future Technology Devices International. We used the DLP-USB232M-G integrated module featuring FTDI’s FT232BL second-generation USB UART.^[10] This module was an appropriate choice for development because it can be plugged into a standard 24-pin 0.6² wide DIP socket that is mounted on our daughter board and it could be moved easily to another board, if required. FTDI also developed its USB functions as LabVIEW Virtual Instruments (VIs) that are called from our HMI, which also made them a good choice for our application.^[11] For message processing on the daughter board, we used a PIC18F4620^[12] with an external CAN bus controller MCP2515^[13] and transceiver MCP2551.^[14] These CAN bus control ICs and the microcontroller are manufactured by Microchip.

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