DG-IRMCK203 Datasheet, PDF (7/67 Pages) International Rectifier – Application Developer’s Guide

IRMCK203 Application Developer’s Guide
2 Concepts
Figure 2 shows the block control structure of the IRMCK203.
2.1 Regulators
2.1.1 Closed Loop Current Control
Two Proportional plus Integral (PI) type current regulators with output limits and Anti-windup control are provided
for torque and flux regulation of motors. Torque current reference is supplied by Speed regulator output and Flux
current reference is set to zero in order to achieve the maximum torque per ampere for a Surface-Mounted Permanent
Magnet motor. The current regulator outputs are modulation depths. The modulation depths are fed to a Space
Vector PWM modulator via a vector rotator (converts dc to ac waveform). Refer to Appendix A for a description of
the Space Vector PWM module.
2.1.2 Closed Loop Velocity Control
A PI speed regulator with output limits (torque current limit) and Anti-windup control is provided for speed
regulation. The speed reference is supplied by the Ramp block (as shown in Figure 2). Both speed acceleration rate
and deceleration rate can be adjusted. In addition, the Ramp block provides minimum speed protection in order to
ensure optimal speed control performance for Sensorless operation. The Ramp block input is the user-desired speed
reference which can be obtained internally from the host register interface or externally via the A/D interface as shown
in Figure 2. Details on how to set up external speed control mode (Standalone mode) are provided in Section 3.2.
AC Power
Analog
Monitor
Host
Controller
EEPROM
Analog Speed
Reference
4
channel
D/A
RS232C
or
RS422
SPI
Interface
Parallel
Interface
Host
Register
Interface
Speed +
Ramp _-
Flux Current
Reference
Configuration
Registers
Monitoring
Registers
IRMCK203
Torque Current
Reference
+
Speed
-
+
-
Current
Current
e^jθ
Rotor Angle/
speed
Estimator
select
A/D
interface
A/D MUX
DC bus dynamic brake _BRAKE
control
DC bus feedback
Space
Vector PWM
(Loss
Minimization)
FAULT
Plug-N-Drive^TM
IGBT module
IRAMY20UP60A
Start-Stop
Sequencer
and
Fault
Detector
ejθ
2/3
Period/Duty
counters
Period/Duty
counters
IR2175
IR2175
Figure 2. Detailed Control Structure
Motor
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