Low-Cost Three-Phase Electricity Meter Reference Design
TIDM-THREEPHASEMETER-F449
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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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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 – see LMV324A for upgraded version  Operational amplifiers (op amps)  Sample & Buy View Design Kits & Evaluation Modules
MSP430F449  8 MHz MCU with 60KB FLASH, 2KB SRAM, 12-bit ADC, Comparator, SPI/UART, 160 Seg LCD  Microcontrollers (MCU)  Sample & Buy View Design Kits & Evaluation Modules
TPS770  50-mA, 10-V, low-IQ, low-dropout voltage 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
Download Download
MSP430F449 Download -
TPS770 Download Download

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Technical documentation

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

Software development (1)


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