Extended Current and Voltage Measurement Using Shunts for Protection Relays Reference Design

(ACTIVE) TIDA-00738

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Key Document

Description

The TIDA-00738 TI design demonstrates a unique approach for extending the current measurement range using a single shunt and voltage measurement using AMC1304Mx5 Isolated Delta-Sigma (ΔΣ) modulator. With careful selection of a low value shunt resistor that minimizes power dissipation, a front end amplifier with low noise and by introducing two gain paths, both upper and lower current limit is extended.  Accuracy of < ±0.5 % for both current and voltage measurement is achieved by interfacing the modulator output to AM437x host processor which performs the Sinc3 filtering.

Features
  • Single Phase voltage and current measurement (shunt based) using isolated delta-sigma modulator (AMC1304Mx5)
  • Measurement accuracy:
    • AC Current: < ± 0.5% from 0.1A to 40A (or 60A) for In = 1A
    • AC Voltage: < ± 0.5% from 10V to 300V
  • AFE interfaced to host  MCU (AM437x Sitara™ ARM® Cortex®-A9 Processor) which performs Sinc3 digital filtering using PRU-ICSS
  • Onboard isolated ± 2.5V and +5.0V Power supply for AMC1304Mx5 and OPA188 using Transformer Driver and LDOs
  • Designed to work from 0.1A to 60A (In=1A) and can be extended for wider range (In=5A) by changing Shunt and Gain values.

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Bill of Materials (BOM)

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TI Devices (8)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
AMC1304M05  Reinforced Isolated Modulator With LDO Regulator, ±50mV Input, and CMOS Interface  Analog-to-digital converters (ADCs)  Sample & Buy View Design Kits & Evaluation Modules
AMC1304M25  Reinforced Isolated Modulator With LDO Regulator, ±250mV Input, and CMOS Interface  Analog-to-digital converters (ADCs)  Sample & Buy View Design Kits & Evaluation Modules
CDCLVC1104  Low Jitter, 1:4 LVCMOS Fan-out Clock Buffer  Clock buffers  Sample & Buy View Design Kits & Evaluation Modules
OPA188  Precision, Low-Noise, Rail-to-Rail Output, 36V Zero-Drift Operational Amplifier   Operational amplifiers (op amps)  Sample & Buy View Design Kits & Evaluation Modules
SN6501  Low-noise, 350 mA, 410-kHz transformer driver for isolated power supplies  Isolation  Sample & Buy View Design Kits & Evaluation Modules
TLV704  24V Input Voltage, 150mA, Ultra-Low-Iq Low-Dropout (LDO) Regulators  Power management  Sample & Buy View Design Kits & Evaluation Modules
TPS709  150-mA 30-V ultra-low-Iq wide-input low-dropout (LDO) regulator with reverse current protection  Power management  Sample & Buy View Design Kits & Evaluation Modules
TPS7A3001-EP  Enhanced Product Negative Vin, -200mA, Ultra-Low-Noise, High-PSRR, Low-Dropout Linear Regulator  Power management  Sample & Buy Not Available

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
AMC1304M05 Download Download
AMC1304M25 Download Download
CDCLVC1104 Download Download
OPA188 Download Download
Download Download
Download
SN6501 Download Download
TLV704 Download Download
TPS709 Download
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TPS7A3001-EP Download Download

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Technical Documents

View the Important Notice for TI Designs covering authorized use, intellectual property matters and disclaimers.

User guides (2)
Title Abstract Type Size (KB) Date Views TI Recommends
PDF 4140 04 Dec 2015 0
PDF 3928 24 Oct 2014 0
Design files (7)
Title Abstract Type Size (KB) Date Views
ZIP 330 14 Dec 2015 0
ZIP 2563 14 Dec 2015 0
PDF 3666 14 Dec 2015 0
PDF 910 14 Dec 2015 0
PDF 505 14 Dec 2015 0
PDF 276 14 Dec 2015 0
PDF 1107 14 Dec 2015 0
Related Tools & Software

Reference Designs  ( 2 )


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