www.irf.com

3

IRMCT3UF1

Module Block Diagram

The IRMCT3UF1 is a complete Sensorless drive system based on a proprietary digital motion control ASIC.

The system is based on a configurable control engine implemented by hardware logics in the ASIC. The

system has a simple and low cost structure, made possible by an advanced IR motion power components

including the MOSFET module and IR2011 monolithic gate driver IC. These components together with the

ASIC simplify hardware implementation. Since all control logic is implemented in hardware state machine

as opposed to programmed software, unmatched parallel computation is achieved resulting in higher

bandwidth control and higher motor operating frequency (< 25

µsec PWM period).

Overview

Application Diagram

Gate

Drive

Gate

Drive

A/D

PM

Motor

28V DC Bus

28V Bus Rtn

U Phase

Current

Speed cmd

VBus

Drive

RS232

Drive

Gate

Power

Over-Temp

Sensorless

Control

ASIC

Fault

Logic

Over-Load

FLT

FLT Clr

W Phase

Current

V Phase

Current

DC-

DC 1

+15V

+5V

+3.3V

Control

Computer

Start/Stop

Control Board

Power

Substrate

(IMS)

Bus

Capacitor

Transient

Protection

28V Bus Rtn

Status - Fault

Status - OK

Linear

Reg

DC-

DC 2

Analog Speed

Command

10,11

14,15

5,6

1,2

16,17

8,9

12,13

3,4

7

24

26

28

27

31

30

33

32

34

18

29

Analog 0 Ref

Analog 0 Ref

.02

.02

.02

22,23,25

substrate

Power

Interfac

e

Controller Section

Power

Substrate

A/D

Motor

DC Bus

DC Bus Rtn

Current

Measurement

Analog

Speed

Command

VBus

Gate

Driv

e

Gate

Driv

e

Serial

Interface

Sensorless FOC Algorithm

RS232 C

θ

j

e

θ

j

e

2/3

Host

Register

Interface

Configuration

Registers

Monitoring

Registers

Space

Vector

PWM

FAULT

+

-

-

+

-

+

Rotor Angle /

speed

Estimator

RAMP

A/D

interface

Discrete

Interface

Discrete I/O

Drive

Gate

Dead

time

Analog

Speed

Command

EEPROM

Power

Interface

Section

+15 +5 +3.3

Current

shunt