Polyphase Shunt Metrology with Isolated AFE Reference Design

(ACTIVE) TIDA-01550

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Key Document

Description

This reference design implements a class 0.5% three-phase energy measurement system with isolated shunt sensors by using metrology analog frontends( AFEs). The metrology AFEs sense the voltage and current for each phase, calculate the metrology parameters for the phase, and then send out the calculated parameters to a host microcontroller using a UART port that is digitally isolated. The capacitive isolation technology used to isolate the UART pins along with the cap-drop power supply used to power the metrology AFEs make this reference design a transformerless design that is immune to magnetic tampering. In addition, because metrology parameters are calculated locally at the metrology AFEs instead of at the Host microcontroller, less CPU bandwidth is needed from the Host for performing metrology calculations.

Features
  • Class 0.5% three-phase metrology with galvanically isolated shunts using isolated, low cost current and voltage measurement AFE
  • Distributed computing: metrology parameters calculated locally at each phase and sent to host microcontroller
  • Reinforced isolation of 5kVrms and 8KV peak
  • Magnetically-immune cap-drop high-side power
  • External crystals or clock not necessary for metrology AFE
  • Phase sequence detection

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Bill of Materials (BOM)

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TI Devices (7)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
ISO7721  High Speed, Robust EMC Reinforced Dual-Channel Digital Isolator  Isolation  Sample & Buy View Design Kits & Evaluation Modules
ISO7731  High Speed, Robust EMC Triple-Channel Digital Isolators  Isolation  Sample & Buy View Design Kits & Evaluation Modules
MSP430I2041  16-bit Mixed Signal Microcontroller  MSP430 ultra-low-power MCUs  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
TLV704  24V Input Voltage, 150mA, Ultra-Low-Iq Low-Dropout (LDO) Regulators  Power management  Sample & Buy View Design Kits & Evaluation Modules
TPS709  150mA 30V Ultra-Low-Iq Wide-Input Low-Dropout (LDO) Regulator With Reverse Current Protection  Power management  Sample & Buy View Design Kits & Evaluation Modules
TRS3232E-Q1  Automotive Catalog 3V to 5.5V Multichannel RS-232 Line Driver/Receiver with +/-15-kV ESD Protection  Interface  Sample & Buy Not Available

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
ISO7721 Download Download
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ISO7731 Download Download
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MSP430I2041 Download Download
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MSP432P4111 Download Download
TLV704 Download Download
TPS709 Download
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TRS3232E-Q1 Download Download

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Technical Documents

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

User guides (1)
Title Abstract Type Size (KB) Date Views TI Recommends
PDF 3841 16 Feb 2018 175
Design files (5)
Title Abstract Type Size (KB) Date Views
ZIP 413 28 Dec 2017 28
ZIP 1264 28 Dec 2017 34
PDF 296 28 Dec 2017 36
PDF 205 28 Dec 2017 56
PDF 113 28 Dec 2017 293
Related Tools & Software

Reference Designs  ( 1 )

Software (1)



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