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TIDA-01094

Magnetically Immune Transformerless Power for Isolated Shunt Current Measurement Reference Design

Design files

TIDA-01094

Design files

Overview

The TIDA-01094 reference design implements a class 0.5 three-phase  transformerless energy measurement system with isolated shunt sensors by using isolated delta-sigma modulators. The delta sigma modulators have their output circuitry capacitively isolated from input circuitry, thereby providing transformerless data isolation. The high-side of each modulator is powered by a cap-drop supply that is also transformerless. Since a transformer is not used in this design, this design is inherently magnetically immune. In addition, the high-side cap-drop power supply reduces the entire system cost, has inherent low conducted and radiated emissions, and  reduces the current consumption drawn from the low-side power supply since the high-side is separately powered from Mains instead of being derived from the low-side power supply.

Features
  • Class 0.5% three-phase metrology with galvanically isolated shunt current sensors
  • Cap-drop power supplies for high side of modulators
  • Isolation performance of up to 1-kV AC (working voltage) and a voltage of 7 kV (peak)
  • Supports both AMC1304M05 and AMC1305M04+TLV70450 configurations
  • TI energy library firmware calculates all energy measurement parameters including active and reactive power and energy, root mean square (RMS) current and voltage, power factor, and line frequency
  • Isolated RS-232 With 3-kVRMS operating isolation boundary for communication to PC graphical user interface (GUI)
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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.

download Design guide — TIDA-01094
PDF | HTML
TIDUBO8A.PDF (16571 K)

Reference design overview and verified performance test data

download Schematic — TIDA-01094
TIDRPR7.PDF (90 K)

Detailed schematic diagram for design layout and components

download Bill of materials (BOM) — TIDA-01094
TIDRPR8.ZIP (435 K)

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

download CAD/CAE symbol — TIDA-01094
TIDRPS0.ZIP (334 K)

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

download Gerber file — TIDA-01094
TIDCD57.ZIP (334 K)

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

download PCB layout — TIDA-01094
TIDRPR9.PDF (385 K)

PCB layer plot file used for generating PCB design layout

Products

Includes TI products in the design and potential alternatives.

Digital isolators

ISO7320C — Low-power, dual-channel, 2/0, 25-Mbps digital isolator

Data sheet: PDF | HTML
Digital isolators

ISO7321C — Low-power, dual-channel, 1/1, 25-Mbps digital isolator

Data sheet: PDF | HTML
Isolated ADCs

AMC1304M05 — ±50-mV input, precision current sensing reinforced isolated modulator with LDO

Data sheet: PDF | HTML
Isolated ADCs

AMC1305M05 — ±50-mV input, precision current sensing reinforced isolated modulator

Data sheet: PDF | HTML
Linear & low-dropout (LDO) regulators

TLV704 — 150-mA 24-V ultra-low-IQ low-dropout (LDO) voltage regulator

Data sheet: PDF | HTML
Linear & low-dropout (LDO) regulators

TPS709 — 150-mA, 30-V, ultra-low-IQ, low-dropout voltage regulator with reverse current protection and enable

Data sheet: PDF | HTML
MSP430 microcontrollers

MSP430F67641A — Low-cost polyphase metering SoC with 3 Sigma-Delta ADCs, 10-bit SAR ADC, LCD, 128KB Flash, 8KB RAM

Data sheet: PDF | HTML
RS-232 transceivers

TRS3232E-Q1 — Automotive 3- to 5.5-V 250kbps RS-232 line driver/receiver with +/-15-kV IEC-ESD protection

Data sheet: PDF

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Software

Technical documentation

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Type Title Date
* Design guide Magnetically Immune Transformerless Power Supply for Iso Shunt Current Ref Guide (Rev. A) PDF | HTML Jan. 30, 2017
Technical article Designing a magnetically immune polyphase smart meter, part 3: comparing isolated PDF | HTML Oct. 29, 2018
Technical article Designing a magnetically immune polyphase smart meter, part 2: an overview of isol PDF | HTML Oct. 18, 2018
Technical article Designing a magnetically immune polyphase smart meter, part 1: isolated shunt sens PDF | HTML Oct. 04, 2018

Related design resources

Reference designs

REFERENCE DESIGN
TIDA-00601 — Multi-phase Energy Measurement with Isolated Shunt Sensors Reference Design TIDA-01088 — Multi-Phase Power Quality Measurement with Isolated Shunt Sensors Reference Design TIDM-3PH-ENERGY5-ESD — Class 0.5 Three-Phase Energy Measurement System with Enhanced ESD Protection Reference Design

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