AN-1090 Datasheet PDF - International Rectifier
Part Number | AN-1090 | |
Description | Controller Dynamics and Tuning | |
Manufacturers | International Rectifier | |
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Application Note AN-1090
IRMCF3xx Series Controller Dynamics and Tuning
By Eddy Ho, International Rectifier
Table of Contents
Page
Introduction .......................................................................................................... 2
Current Controller................................................................................................. 2
Speed Controller .................................................................................................. 6
Field-Weakening Controller ................................................................................ 10
Critical Over Voltage Protection ......................................................................... 12
Interior Permanent Magnet Motor Control .......................................................... 14
This application note describes how to tune the embedded control loops on the
IRMCF3xx series of control IC’s. This covers the IRMCF312, IRMCF311 and
IRMCF343 digital control IC’s for air-conditioning systems and the IRMCF341 IC
for washing machine applications. The control loops include the ID and IQ current
control loops, the velocity control loop, the field weakening loop, IPM control and
bus voltage protection. The note describes the equations used to derive the
control loop constants and experimental methods to tune control constant
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Once current regulator diagnostic is executed, step current response can be observed from trace
function or current probes on w-phase. It is recommended to use current probe to observe step
current response. Figure 4 shows (current probe) the step current response of w-phase when
Current Reg diagnostic function is executed. In this figure, 25% step rated motor current is
commanded. The step level can be controlled by parameter ParkI (inside Current Reg Diagnostic
function). Figure 5 shows the expanded version of Figure 4. The measured current loop response
is critically damped at 0.65 msec time constant (0 – 66.3% of final steady value), which is
approximately equal to the anticipated current regulator bandwidth response (1/1500 =
0.667msec).
25%
0%
Figure 4. Step Current Response
0.65 msec
Figure 5. Step Current Response (Expanded Time Scale)
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Part DetailsOn this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for AN-1090 electronic component. |
Information | Total 15 Pages | |
Link URL | [ Copy URL to Clipboard ] | |
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