IRMCS1071

Overview

IRMCS1071 is a reference design platform for inverter-controlled appliance motor drive applications based

on iMOTION

power module.

IRMCK171 is International Rectifier’s new integrated circuit device primarily designed as a one-chip

solution for sensorless permanent magnet motor control in appliance applications. Unlike a traditional

microcontroller or DSP, IRMCK171 provides a built-in closed loop sensorless control algorithm using a

unique Motion Control Engine (MCE

EMF. IRMCK171 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. The MCE

collection of control elements, motion peripherals, a dedicated motion control sequencer and dual port RAM

to map internal signal nodes. Motion control programming is achieved by using a dedicated graphical

compiler integrated into the MATLAB/Simulink

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 schematic using the IRMCK171.

IRMCK171 has 32K bytes of program OTP and 12K of program RAM. At power up, 12K of the program

stored in OTP is copied to RAM for high speed execution by the MCE processor. The 8051 program is

executed directly form OTP by the 8051 processor. The IC on the reference board comes with

preprogrammed OTP. Both 8051 application program and MCE firmware is ready for execution. IRMCK171

comes in a 48-pin QFP package.

IRAM336-025SB is an integrated power module developed and optimized for appliance motor control.

Together with IRMCK171 it offers highly integrated solution for single shunt PM motor control. The module

has several built-in protection features such as temperature feedback, shoot through prevention, under

voltage lockout and shutdown. Furthermore, the module features a combination of highly efficient high

voltage MOSFETs and the industry benchmark 3-phase HVIC driver. The bootstrapped power supplies for

the high side drivers can be generated using internal bootstrap diodes eliminating the need for isolated

power supplies.

IRMCK171

Switch

Mode

Power

Supply

HVIC

Gate Drive

&

Protection

Circuit

Up to 12 Digital

Input/Output

5 Analog Input

Appliance Inverter

3.3V

Passive

EMI

Filter

UART interface

Motor

(PMSM or IM)

Figure 1 Typical Application Block Diagram Using IRMCK171

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