Low-Cost Three-Phase Electricity Meter Reference Design

(ACTIVE) TIDM-THREEPHASEMETER-F449

Description & Features

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Description

The design implements a basic three-phase electric meter system using the MSP430F449 smart meter SoC, the LMV324 precision op amps, and TPS76333 LDO regulator . It meets all of the requirements for ANSI C12.20 and IEC-62053 Class 0.5 meters.The MSP430F449 SoC is a low-cost option for engineers developing polyphase energy measurement systems for utility meters and industrial applications. . The LMV324 op amps are used for conditioning the voltage and current signals coming from the current transformers. The design uses a capacitive-drop power supply based on the TPS76333 to provide a low-cost power supply solution. Hardware and software design files are provided to enable calculation of various parameters for three-phase energy measurement, such as RMS current & voltage, active and reactive power and energies, power factor and frequency. With this design developers can quickly determine that the MSP430F449 e-meter SoC meets the requirements for their low-cost smart e-meter.

Features
  • Three-phase electricity meter that meets Class 0.5 accuracy requirements from ANSI and IEC
  • TI Energy Library firmware calculates all energy measurement parameters including active and reactive power and energy, RMS current and voltage, power factor, and line frequency
  • Built-in 160-segment display
  • Powered from three-phase line voltage

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Schematic/Block Diagram

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Source Files

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Bill of Materials (BOM)

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TI Devices (3)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
LMV324  Quad Low-Voltage Rail-to-Rail Output Operational Amplifier  Operational amplifiers (op amps)  Sample & Buy View Design Kits & Evaluation Modules
MSP430F449  16-Bit Ultra-Low-Power MCU, 60kB Flash, 2048B RAM, 12-Bit ADC, 2 USARTs HW Multiplier, 160 Seg LCD  MSP430 ultra-low-power MCUs  Sample & Buy View Design Kits & Evaluation Modules
TPS770  10-V, 50-mA, Low-Iq, Low-Dropout Linear Regulator  Power management  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
LMV324 Download Download
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MSP430F449 Download -
TPS770 Download Download

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Technical Documents

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

Design files (3)
Title Abstract Type Size (KB) Date Views
ZIP 163 27 Feb 2014 9
PDF 103 27 Feb 2014 34
ZIP 22 27 Feb 2014 13
Related Tools & Software

Software (1)


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