TIDA-010037

High accuracy split-phase CT electricity meter reference design using standalone ADCs

TIDA-010037

Design files

Overview

This reference design implements Class 0.1 split-phase energy measurement using high-performance, multi-channel analog-to-digital converters (ADC). The independent ADC samples the output of current transformers (CT) at 8 kHz to measure the current and voltage of each leg of the AC mains. The reference design can achieve high accuracy across a wide input current range (0.05 – 100 amps) and supports high sampling frequencies necessary for advanced power quality features such as individual harmonic analysis. Using an independent ADC to sample the CT output provides designers greater flexibility in the choice of metrology microcontrollers when compared to integrated SoCs and dedicated application-specific products. The reference design uses a SimpleLink™ ARM Cortex-M4 host microcontroller to calculate energy measurement parameters.  This design can also use an ADC sample rate of 32 ksps by only enabling a subset of the full energy measurement parameters.

Features
  • Split-phase metrology for electricity meters that meets ANSI C12.20 Class 0.1 active energy accuracy requirements across 10000:1 input range
  • Active and reactive energy and power, root mean square (RMS) current and voltage, power factor, and line-frequency calculations
  • Isolated RS-232 and RS-485 with 5-kV RMS isolation
  • Communications module expansion with current limit and overvoltage and undervoltage protection
  • Tested across 50-mA to 100-A input range
  • Complete, tested reference design with hardware files and design guide
  • High active energy accuracy still obtained when ADC sample rate increased to 32 ksps

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.

TIDUEM8B.PDF (5564 K)

Reference design overview and verified performance test data

TIDRZB8.PDF (670 K)

Detailed schematic diagram for design layout and components

TIDRZB9.PDF (169 K)

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

TIDRZC0.PDF (429 K)

Detailed overview of design layout for component placement

TIDRZC2.ZIP (16902 K)

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

TIDCFD3.ZIP (2336 K)

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

TIDRZC1.PDF (2166 K)

PCB layer plot file used for generating PCB design layout

Products

Includes TI products in the design and potential alternatives.

Digital isolators

ISO7720Robust EMC, dual-channel, 2/0, reinforced digital isolator

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Digital isolators

ISO7731Robust EMC, triple-channel, 2/1, reinforced digital isolator

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ESD & surge protection ICs

TVS180018V flat-clamp surge protection device

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Linear & low-dropout (LDO) regulators

TPS709150-mA, 30-V, ultra-low-IQ, low-dropout voltage regulator with reverse current protection and enable

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Precision ADCs (<=10MSPS)

ADS131M0424-bit, 32-kSPS, 4-channel, simultaneous-sampling, delta-sigma ADC

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RS-232 transceivers

TRS3232E3- to 5.5-V dual channel 250kbps RS-232 line driver/receiver with +/-15-kV IEC-ESD protection

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RS-485 & RS-422 transceivers

THVD15005-V RS-485 transceiver up to 500 kbps with ±8-kV IEC ESD protection

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Supervisor & reset ICs

TPS3840Nanopower high-input voltage supervisor with manual reset and programmable-reset time delay

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eFuses & hot swap controllers

TPS25921L4.5-V to 18-V, 90mΩ, 0.4-1.6A eFuse with latch off fault response

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Technical documentation

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Type Title Date
* Design guide High-Accuracy Split-Phase CT Electricity Meter Reference Design Using Standalone (Rev. B) Oct. 09, 2020

Related design resources

Software development

APPLICATION SOFTWARE & FRAMEWORK
ADC-ENERGY-METROLOGY-LIB-SW ADC energy metrology library software

Reference designs

REFERENCE DESIGN
TIDA-010036 One-phase shunt electricity meter reference design using standalone ADCs

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