4
Overview
IRMCF311 is a new International Rectifier integrated circuit device primarily designed as a one-
chip solution for complete inverter controlled air conditioner motor control applications. Unlike a
traditional microcontroller or DSP, the IRMCF311 provides a built-in closed loop sensorless
control algorithm using the unique Motion Control Engine (MCE
TM
) for permanent magnet
motors. The MCE
TM
consists of a collection of control elements, motion peripherals, a dedicated
motion control sequencer and dual port RAM to map internal signal nodes. IRMCF311 also
employs a unique single shunt current reconstruction circuit to eliminate additional analog/digital
circuitry and enables a direct shunt resistor interface to the IC. Motion control programming is
achieved using a dedicated graphical compiler integrated into the MATLAB/Simulink
TM
development environment. Sequencing, user interface, host communication, and upper layer
control tasks can be implemented in the 8051 high-speed 8-bit microcontroller. The 8051
microcontroller is equipped with a JTAG port to facilitate emulation and debugging tools. Figure 1
shows a typical application schematics using IRMCF311.
IRMCF311 is intended for development purpose and contains 48K bytes of RAM, which can be
loaded from external EEPROM for 8051 program execution. For high volume production,
IRMCK311 contains OTP ROM in place of program RAM to reduce the cost. Both IRMCF311
and IRMCK311 come in the same 64-pin QFP package with identical pin configuration to facilitate
PC board layout and transition to mass production
Passive
EMI
Filter
IRMCF311
Galvanic
Isolation
IRS2630D
IPM
DC bus
Communication
to indoor unit
AC input
(100-
230V)
Compressor
Motor
SPM
IRS2631D
60-100W
Fan Motor
IGBT inverter
FREDFET inveter
EEPROM
7
6
2
User Parameter
Storage
Analog output
Digital I/O
2
1
3
Temperature feedback
Analog actuators
Relay, Valves, Switches
Motor PWM +
PFC+GF
Fault
EEPROM
User Program
Storage
Analog input
Galvanic
Isolation
Field
Service
Fault
RS232C
Serial Comm
Temp sense
Multple
Power
supply
Motor PWM
15V
3.3V
1.8V
Figure 1. Typical Application Block Diagram Using IRMCF311
