AMC1306E05 Datasheet, PDF (24/40 Pages) Texas Instruments – Small, High-Precision, Reinforced Isolated Delta-Sigma Modulators with High CMTI

AMC1306E05, AMC1306E25, AMC1306M05, AMC1306M25
SBAS734 – MARCH 2017
www.ti.com
9.2 Typical Applications
9.2.1 Frequency Inverter Application
Isolated ΔΣ modulators are being widely used in frequency inverter designs because of their high ac and dc
performance. Frequency inverters are critical parts of industrial motor drives, photovoltaic inverters (string and
central inverters), uninterruptible power supplies (UPS), electrical and hybrid electrical vehicles, and other
industrial applications.
Figure 51 shows a simplified schematics of the AMC1306Mx in a typical frequency inverter application as used in
industrial motor drives with shunt resistors (R_SHUNT) used for current sensing. Depending on the system design,
either all three or only two motor phase currents are sensed.
The Manchester coded bitstream output of the AMC1306Ex minimizes the wiring efforts of the connection
between the power board and the control board; see Figure 52. This bitstream output also allows the clock to be
generated locally on the power board without the having to adjust the propagation delay time of each DOUT
connection to fulfill the setup and hold time requirements of the microcontroller.
In both examples, an additional fourth AMC1306 is used to support isolated voltage sensing of the dc link. This
high voltage is reduced using a high-impedance resistive divider and is sensed by the device across a smaller
resistor. The value of this resistor can degrade the performance of the measurement, as described in the Isolated
Voltage Sensing section.
DC link
Motor
RSHUNT
L1
RSHUNT
L3
RSHUNT
L2
3.3 V
AMC1306Mx
3.3 V AVDD DVDD
AINP CLKIN
AINN DOUT
AMC1306Mx
AGND DGND
AVDD DVDD 3.3 V
AINP CLKIN
AINN DOUT
AGND DGND
3.3 V
3.3 V
AMC1306Mx
AVDD DVDD
AINP CLKIN
AINN DOUT
AGND DGND
3.3 V
3.3 V
AMC1306Mx
AVDD DVDD
AINP CLKIN
AINN DOUT
AGND DGND
3.3 V
CDCLVC1104
TMS320F28x7x
SD-D1
SD-C1
SD-D2
SD-C2
SD-D3
SD-C3
SD-D4
SD-C4
PWMx
Power Board
Control Board
Copyright © 2017, Texas Instruments Incorporated
Figure 51. The AMC1306Mx in a Frequency Inverter Application
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