TIDA-01094
Magnetically Immune Transformerless Power for Isolated Shunt Current Measurement Reference Design
TIDA-01094
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
ISO7320C — Low-power, dual-channel, 2/0, 25-Mbps digital isolator
Data sheetDigital isolators
ISO7321C — Low-power, dual-channel, 1/1, 25-Mbps digital isolator
Data sheetIsolated ADCs
AMC1304M05 — Reinforced Isolated Modulator With LDO Regulator, ±50mV Input, and CMOS Interface
Data sheetIsolated ADCs
AMC1305M05 — Reinforced Isolated Modulator With ±50mV Input and CMOS Interface
Data sheetLinear & low-dropout (LDO) regulators
TLV704 — 150-mA, 24-V, ultra-low-IQ, low-dropout voltage regulator
Data sheetLinear & low-dropout (LDO) regulators
TPS709 — 150-mA, 30-V, ultra-low-IQ, low-dropout voltage regulator with reverse current protection and enable
Data sheetMSP430 microcontrollers
MSP430F67641A — Low-cost polyphase metering SoC with 3 Sigma-Delta ADCs, 10-bit SAR ADC, LCD, 128KB Flash, 8KB RAM
Data sheetRS-232 transceivers
TRS3232E-Q1 — Automotive 3- to 5.5-V 250kbps RS-232 line driver/receiver with +/-15-kV IEC-ESD protection
Data sheetStart development
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
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