TIDA-00209

Isolated Current Shunt and Voltage Measurement Reference Design for Motor Drives Using AM437x

TIDA-00209

Design files

Overview

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

A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Design files & products

Design files

Download ready-to-use system files to speed your design process.

TIDU755.PDF (9174 K)

Reference design overview and verified performance test data

TIDRDD5.ZIP (761 K)

Detailed schematic diagram for design layout and components

TIDRDD6.ZIP (210 K)

Complete listing of design components, reference designators, and manufacturers/part numbers

TIDRDD7.ZIP (1471 K)

Detailed overview of design layout for component placement

TIDRDD9.ZIP (582 K)

Files used for 3D models or 2D drawings of IC components

TIDC963.ZIP (9637 K)

Design file that contains information on physical board layer of design PCB

TIDRDD8.ZIP (2388 K)

PCB layer plot file used for generating PCB design layout

Products

Includes TI products in the design and potential alternatives.

Arm-based processors

AM4376Sitara processor: Arm Cortex-A9, PRU-ICSS

Data sheet document-pdfAcrobat PDF open-in-new HTML
Arm-based processors

AM4377Sitara processor: Arm Cortex-A9, PRU-ICSS, EtherCAT

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Arm-based processors

AM4378Sitara processor: Arm Cortex-A9, PRU-ICSS, 3D graphics

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Arm-based processors

AM4379Sitara processor: Arm Cortex-A9, PRU-ICSS, EtherCAT, 3D graphics

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Clock buffers

CDCLVC1108Low jitter, 1:8 LVCMOS fan-out clock buffer

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Instrumentation amplifiers

INA826Precision, 200-μA Supply Current, 36-V Supply Instrumentation Amplifier

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Isolated ADCs

AMC1304M05Reinforced Isolated Modulator With LDO Regulator, ±50mV Input, and CMOS Interface

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Isolated ADCs

AMC1304M25Reinforced Isolated Modulator With LDO Regulator, ±250mV Input, and CMOS Interface

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Isolated ADCs

AMC1305M05Reinforced Isolated Modulator With ±50mV Input and CMOS Interface

Data sheet document-pdfAcrobat PDF open-in-new HTML
Isolated ADCs

AMC1305M25Reinforced Isolated Modulator With ±250mV Input and CMOS Interface

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Precision op amps (Vos<1mV)

OPA2111.1nV/rtHz Noise, Low-Power, Precision Operational Amplifier

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Transformer drivers

SN6501Low-noise, 350-mA, 410-kHz transformer driver for isolated power supplies

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Technical documentation

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Type Title Date
* Design guide Isolated Current Shunt and Voltage Measurement Kit for Motor Drives Using AM437x Feb. 19, 2015
Selection guide TI Components for Aerospace and Defense Guide (Rev. E) Mar. 22, 2017

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