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TIDA-00810

Reference Design to Measure AC Voltage & Current in Protection Relays w/Delta-Sigma Chip Diagnostics

Design files

TIDA-00810

Design files

Overview

The TIDA-00810 reference design accurately measures analog inputs performance and includes chip diagnostics to help identify power  systems failures early by using a highly accuracy AC voltage and current measurement analog front end (AFE) and a four-channel, 24-bit simultaneously-sampling differential input Delta-Sigma ADC for measurement over wide dynamic range. The ADC is configured to measure 0-5 V unipolar. The inputs are scaled to ADC measurement range using a fixed gain amplifier with 2.5 V DC output level shift. The AFE can be used to measure output of a current transformer, potential divider with analog isolation and Rogowski active integrator. The AFE uses 10-Bit low resolution successive approximation register (SAR) ADC in parallel with a 24 bit ∑-∆ ADC for ADS131A04 diagnostics.

Features
  • Data acquisition and diagnostics coverage provided using 24-bit ∑-∆ ADC and 10/12-bit SAR ADC
  • Output from the ∑-∆ ADC is validated by comparing it with SAR ADC – peak/RMS value is used for validation
  • ∑-∆ ADC reference output or external reference is monitored using a comparator
  • Current measurement accuracy is verified using current transformer and Rogowski coil with hardware integrator
  • Voltage measurement accuracy is verified using a potential divider (PD) without and with an isolation amplifier
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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.

download Design guide — TIDA-00810
TIDUBY7A.PDF (2878 K)

Reference design overview and verified performance test data

download Schematic — TIDA-00810
TIDRMS9.PDF (2357 K)

Detailed schematic diagram for design layout and components

download Bill of materials (BOM) — TIDA-00810
TIDRMT0.PDF (166 K)

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

download Assembly drawing — TIDA-00810
TIDRMT1.ZIP (1403 K)

Detailed overview of design layout for component placement

download CAD/CAE symbol — TIDA-00810
TIDRMT3.ZIP (2252 K)

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

download Gerber file — TIDA-00810
TIDCCF5.ZIP (1195 K)

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

download PCB layout — TIDA-00810
TIDRMT2.PDF (6817 K)

PCB layer plot file used for generating PCB design layout

Products

Includes TI products in the design and potential alternatives.

Precision ADCs

ADC104S021 — 10-Bit, 200-kSPS, 4-Ch SAR ADC with single-ended inputs and serial interface

Data sheet: PDF
Precision ADCs

ADS131A04 — 24-bit 128-kSPS 4-channel simultaneous-sampling delta-sigma ADC

Data sheet: PDF | HTML
Charge pumps (inductorless)

TPS60403 — 60mA Charge Pump Voltage Inverter with Fixed 250kHz Operation

Data sheet: PDF | HTML
Clock buffers

CDCLVC1102 — Low jitter, 1:2 LVCMOS fan-out clock buffer

Data sheet: PDF | HTML
Comparators

LMV331 — Single General Purpose Low-Voltage Comparator

Data sheet: PDF | HTML
Isolated amplifiers

AMC1200 — ±250-mV input, precision current sensing basic isolated amplifier

Data sheet: PDF | HTML
Linear & low-dropout (LDO) regulators

TLV704 — 150-mA 24-V ultra-low-IQ low-dropout (LDO) voltage regulator

Data sheet: PDF | HTML
Linear & low-dropout (LDO) regulators

TPS717 — 150-mA, high-PSRR, low-IQ, low-dropout voltage regulator with enable

Data sheet: PDF | HTML
Precision op amps (Vos<1mV)

OPA4180 — 0.1 uV/C Drift, Quad, Low Noise, Rail-to-Rail, 36V Zero Drift Op Amp

Data sheet: PDF | HTML
Shunt voltage references

LM4040-N — 100-ppm/°C precision micropower shunt voltage reference

Data sheet: PDF
Transformer drivers

SN6501 — Low-noise, 350-mA, 410-kHz transformer driver for isolated power supplies

Data sheet: PDF | HTML

Start development

Software

Technical documentation

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Type Title Date
* Design guide Ref Design to Measure AC Volt and Curr in Protection Relay w/ DS Chip Diagnostic (Rev. A) Nov. 15, 2016
Technical article Exploring high-voltage transmission – part 1, line-commutated converters Mar. 07, 2017
Technical article Tripping Point: Isolation amplifier-based alternating current voltage measurement in protection relays Oct. 07, 2016

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