Microchip Technology MCP6 series Manual de usuario descargar pdf (Pagina 14)

AN900

DS00900A-page 14  2004 Microchip Technology Inc.

APPENDIX A: PICDEM™ MC

BOARD OVERVIEW

A PICDEM MC demonstration board was used to

develop, test and debug the ACIM control code

discussed in this application note. The overall block

diagram is shown in Figure A-1.

The board has a diode bridge rectifier that converts a

single-phase AC input to DC, while a power capacitor

bank provides a stable DC bus. A switching power

supply generates several DC supply levels for digital,

analog and power electronics. A 3-phase IGBT-based

inverter bridge with integrated gate drivers is used to

drive the motor from the DC bus.

The on-board user interface has two momentary push

buttons, a potentiometer and four LEDs to indicate

status. In this application, switch SW1 is used to toggle

between motor Run and Stop. Switch SW2 is used to

toggle between forward and reverse rotation. The

potentiometer is used for setting the desired speed.

The LEDs are used for indications of different states of

control and as Fault indicators. The board can also be

controlled with a host PC over a serial port using

Microchip’s own Motor Control GUI.

The control circuit and power circuits are electrically

isolated from each other by optoisolators. With the

isolation between power and control circuits, program-

ming and debugging tools can be plugged to the

development board with power connected to the board.

For debugging the code in this application note, an

MPLAB

ICD 2 was connected directly to the PICDEM

MC board during development.

For a complete description, please refer to the

“PICDEM MC Development Board for PIC18FXX31

User’s Guide” (DS51453).

FIGURE A-1: PICDEM MC EVALUATION BOARD FUNCTIONAL BLOCK DIAGRAM

PIC18FXX31

Optoisolators

RS-232

Interface

User

Push Buttons

LEDs

RS-232

Connector

Potentiometer

ICD

Connector

Gate Driver and

IRAMS10UP60A

Voltage

Monitor

Hall Sensor

Connector

Quad Encoder

Connector

Isolated

Control

Section

Power

+5 VDC

+5 VAC

Switcher

Current

Monitor

Temperature

Monitor

Back EMF

Conditioner

Phase Current

Monitors

+15 VAC

D GND

A GND

Comparator

VBUS

Bridge

Rectifier

Power Terminal Block

Motor

Terminal Block

3-Phase Inverter

PWM

1 2 ... 9 10 11 12 13 14 15 16 17 18 19 ... 23 24

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