Datasheet

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SBAS253E − MAY 2003 − REVISED JULY 2006
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10
1.9 TYPICAL APPLICATION CIRCUIT
AC Motor
Positioning
Sensor1
at Motor
Load with
Positioning
Sensor2
2
· 2
2 · 2
OPA364
DC Link Voltage Sensor
DC Link
Voltage
R
S
T
IGBTs
Analog
Input
OPA354
OPA364
OPA364
UC
AN1
AN2
AN3
Sign and
Over−Current
Comparators
3ADCs
7S&H
12 Channels
Counters
Flexible
Interface
2.5V
Reference
8−Bit DAC
ADS7869
OPA364
OPA364
OPA364
A1/B1
A2/B2
AX/BX
VC WC
OPA364
IU IV IW
Current Sensor IU
Current Sensor IV
Current Sensor IW
3 · 2
Figure 1−1. Typical Motor Control Application
Figure 1−1 shows an example of a typical motor control circuit. The IU, IV and IW channels measure the
currents of the motor. The position (speed) of the motor and load are measured simultaneously by A1, B1 and
A2, B2, respectively, using resolver or analog encoder sensors. The asynchronous inputs AX and BX can be
used to capture the reference signal of encoders to derive the absolute position. Channel AN1 measures the
differential DC link voltage. AN3 measures the temperature of the motor. An auxiliary voltage can be measured
with channel AN2. The counter inputs connect to the appropriate comparator outputs (A1 to CNTA1, B1 to
CNTB1 and so on). The level input of the window comparators, DAIN, should be connected to the 8-bit DAC
output DAOUT.