High accuracy split-phase CT electricity meter reference design using standalone ADCs TIDA-010037 (ACTIVE)

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Key Document

Description

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.

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 100A input range
  • Complete, tested reference design with hardware files and design guide

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TI Devices (10)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
ADS131M04  24-bit 32-kSPS 4-channel simultaneous-sampling delta-sigma ADC  Analog-to-digital converters (ADCs)  Sample & Buy View Design Kits & Evaluation Modules
ISO7720  High-speed, robust EMC reinforced dual-channel digital isolator  Isolation  Sample & Buy View Design Kits & Evaluation Modules
ISO7731B  High-speed basic insulation triple-channel digital isolator  Isolation  Sample & Buy View Design Kits & Evaluation Modules
MSP432P4111  SimpleLink Ultra-Low-Power 32-Bit Arm Cortex-M4F MCU with Precision ADC, 2MB Flash and 256KB RAM  SimpleLink MCUs  Sample & Buy View Design Kits & Evaluation Modules
THVD1500  5-V RS-485 transceiver up to 500 kbps with ±8-kV IEC ESD protection  Interface  Sample & Buy View Design Kits & Evaluation Modules
TPS25921L  18V, 1.6A, 90mΩ eFuse with Adjustable +/-2% Accurate Current Limit  Power switches  Sample & Buy View Design Kits & Evaluation Modules
TPS3840  Nanopower high-input voltage supervisor with manual reset and programmable-reset time delay  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
TRS3232E  3-V to 5.5-V Multichannel RS-232 Line Driver/Receiver With +/-15-kV ESD Protection  Interface  Sample & Buy Not Available
TVS1800  18V flat-clamp surge protection device  Circuit protection  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
ADS131M04 Download Download
Download -
ISO7720 Download Download
Download
Download Download
ISO7731B Download
MSP432P4111 Download Download
THVD1500 Download
TPS25921L Download Download
TPS3840 Download Download
TPS709 Download
Download
TRS3232E Download -
Download Download
Download Download
Download Download
TVS1800 Download Download

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Technical Documents

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User guides (1)
Title Type Size (KB) Date
PDF 4793 13 Mar 2019
Design files (6)
Title Type Size (KB) Date
ZIP 2336 13 Mar 2019
ZIP 16902 13 Mar 2019
PDF 2166 13 Mar 2019
PDF 429 13 Mar 2019
PDF 169 13 Mar 2019
PDF 670 13 Mar 2019
Related Tools & Software

Reference Designs  ( 1 )

Name Part Number Tool Type
One-phase shunt electricity meter reference design using standalone ADCs  TIDA-010036  TI Designs

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