Magnetically Immune Transformerless Power for Isolated Shunt Current Measurement Reference Design

(ACTIVE) TIDA-01094

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Key Document

Description

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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TI Devices (8)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
AMC1304M05  Reinforced Isolated Modulator With LDO Regulator, ±50mV Input, and CMOS Interface  Analog-to-Digital Converters (ADCs)  Sample & Buy View Design Kits & Evaluation Modules
AMC1305M05  Reinforced Isolated Modulator With ±50mV Input and CMOS Interface  Analog-to-Digital Converters (ADCs)  Sample & Buy View Design Kits & Evaluation Modules
ISO7320C  Robust EMC, Low Power, Dual-Channel 2/0 Digital Isolator, Fail-Safe High  Isolation  Sample & Buy View Design Kits & Evaluation Modules
ISO7321C  Robust EMC, Low Power, Dual-Channel 1/1 Digital Isolator, Fail-safe High  Isolation  Sample & Buy View Design Kits & Evaluation Modules
MSP430F67641A  MSP430F676x1A Polyphase Metering SoCs  MSP430 Ultra-Low-Power MCUs  Sample & Buy View Design Kits & Evaluation Modules
TLV704  24V Input Voltage, 150mA, Ultra-Low-Iq Low-Dropout (LDO) Regulators  Linear Regulator (LDO)  Sample & Buy View Design Kits & Evaluation Modules
TPS709  150mA 30V Ultra-Low-Iq Wide-Input Low-Dropout (LDO) Regulator With Reverse Current Protection  Linear Regulator (LDO)  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

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 16476 30 Jan 2017 133
Design files (5)
Title Abstract Type Size (KB) Date Views
ZIP 334 07 Feb 2017 2
ZIP 334 07 Feb 2017 26
PDF 385 07 Feb 2017 26
ZIP 435 07 Feb 2017 36
PDF 90 07 Feb 2017 173
Related Tools & Software

Reference Designs (3)

Software (1)



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