TIDA-01094

Magnetically Immune Transformerless Power for Isolated Shunt Current Measurement Reference Design

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)

Design files & products

Design files

Download ready-to-use system files to speed your design process.

TIDUBO8A.PDF (16476 K)

Reference design overview and verified performance test data

TIDRPR7.PDF (90 K)

Detailed schematic diagram for design layout and components

TIDRPR8.ZIP (435 K)

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

TIDRPS0.ZIP (334 K)

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

TIDCD57.ZIP (334 K)

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

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

ISO7320CLow-power, dual-channel, 2/0, 25-Mbps digital isolator

Data sheet document-pdfAcrobat PDF open-in-new HTML
Digital isolators

ISO7321CLow-power, dual-channel, 1/1, 25-Mbps digital isolator

Data sheet document-pdfAcrobat PDF open-in-new HTML
Isolated ADCs

AMC1304M05Reinforced Isolated Modulator With LDO Regulator, ±50mV Input, and CMOS Interface

Data sheet document-pdfAcrobat PDF open-in-new HTML
Isolated ADCs

AMC1305M05Reinforced Isolated Modulator With ±50mV Input and CMOS Interface

Data sheet document-pdfAcrobat PDF open-in-new HTML
Linear & low-dropout (LDO) regulators

TLV704150-mA, 24-V, ultra-low-IQ, low-dropout voltage regulator

Data sheet document-pdfAcrobat PDF open-in-new HTML
Linear & low-dropout (LDO) regulators

TPS709150-mA, 30-V, ultra-low-IQ, low-dropout voltage regulator with reverse current protection and enable

Data sheet document-pdfAcrobat PDF open-in-new HTML
MSP430 microcontrollers

MSP430F67641ALow-cost polyphase metering SoC with 3 Sigma-Delta ADCs, 10-bit SAR ADC, LCD, 128KB Flash, 8KB RAM

Data sheet document-pdfAcrobat PDF open-in-new HTML
RS-232 transceivers

TRS3232E-Q1Automotive 3- to 5.5-V 250kbps RS-232 line driver/receiver with +/-15-kV IEC-ESD protection

Data sheet document-pdfAcrobat PDF

Start development

Software

Support software

TIDA-01094 Software (Rev. A) – TIDCD58A.ZIP (6823 K)

Technical documentation

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