Isolated Current Shunt and Voltage Measurement Reference Design for Motor Drives Using AM437x
TIDA-00209
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Key Document
Description
This reference design uses the AMC130x reinforced isolated delta-sigma modulators along with AM437x Sitara™ ARM® Cortex® -A9 Processor, which implements Sinc filters on PRU-ICSS. The design provides an ability to evaluate the performance of these measurements: three motor currents, three inverter voltages, and the DC Link voltage. Provided in the reference design is firmware to configure the Sinc filters, set the modulator frequency, and receive data from Sinc filters. A versatile run-time GUI is also provided to help the user validate the AMC130x performance and supports configuration changes to Sinc filter parameters in the Sitara™ Processor.
Features
- Unique lower input voltage range of 50mV allows use of smaller shunt resitors enabling lower cost and heat dissipation
- Implements Sinc3 Digital Filters on AM437x Sitara™ ARM® Cortex® -A9 Processor with proprietary programmable real-time unit (PRU-ICSS)
- Precise measurements across reinfoced isolation barrier : calibrated accuracy of ±0.2%
- Fast (<4uSec) response time for Short Circuit protection using Sinc3 filter with OSR of 16, eliminating the need for external components
- Run-time Run-time GUI for complete performance analysis of modulator clock, sinc filter parameters, and currrent and voltage waveforms
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Schematic/Block Diagram
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Test Data
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TI Devices (12)
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| Sample & Buy |
Design Kits & Evaluation Modules |
| AM4376 |
Sitara processor: Arm Cortex-A9, PRU-ICSS |
Processors |
Sample & Buy |
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| AM4377 |
Sitara processor: Arm Cortex-A9, PRU-ICSS, EtherCAT |
Processors |
Sample & Buy |
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| AM4378 |
Sitara processor: Arm Cortex-A9, PRU-ICSS, 3D graphics |
Processors |
Sample & Buy |
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| AM4379 |
Sitara processor: Arm Cortex-A9, PRU-ICSS, EtherCAT, 3D graphics |
Processors |
Sample & Buy |
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| AMC1304M05 |
Reinforced Isolated Modulator With LDO Regulator, ±50mV Input, and CMOS Interface |
Isolation |
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| AMC1304M25 |
Reinforced Isolated Modulator With LDO Regulator, ±250mV Input, and CMOS Interface |
Isolation |
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| AMC1305M05 |
Reinforced Isolated Modulator With ±50mV Input and CMOS Interface |
Isolation |
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| AMC1305M25 |
Reinforced Isolated Modulator With ±250mV Input and CMOS Interface |
Isolation |
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| CDCLVC1108 |
Low jitter, 1:8 LVCMOS fan-out clock buffer |
Clocks & timing |
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| INA826 |
Precision, 200-μA Supply Current, 36-V Supply Instrumentation Amplifier |
Amplifiers |
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| OPA211 |
1.1nV/rtHz Noise, Low-Power, Precision Operational Amplifier |
Operational amplifiers (op amps) |
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| SN6501 |
Low-noise, 350-mA, 410-kHz transformer driver for isolated power supplies |
Power for signal isolators |
Sample & Buy |
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Technical documentation
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User guide (1)
| Title | Type | Size (KB) | Date |
| | PDF | 9174 |
19 Feb 2015
|
Selection guide (1)
| Title | Type | Size (KB) | Date |
| | PDF | 9699 |
22 Mar 2017
|
Design files (6)
| | ZIP | 9637 |
10 Mar 2015
|
| | ZIP | 582 |
10 Mar 2015
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| | ZIP | 2388 |
10 Mar 2015
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| | ZIP | 1471 |
10 Mar 2015
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| | ZIP | 210 |
10 Mar 2015
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| | ZIP | 761 |
10 Mar 2015
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