Magnetically Immune Transformerless Power for Isolated Shunt Current Measurement Reference Design
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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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Schematic/Block Diagram
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Design Guide
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Bill of Materials (BOM)
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TI Devices (8)
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| 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 |
Power management |
Sample & Buy |
View Design Kits & Evaluation Modules |
| TPS709 |
150-mA 30-V 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
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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 |
| | | PDF | 16476 |
30 Jan 2017
|
Design files (5)
| | | ZIP | 334 |
07 Feb 2017
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| | | ZIP | 334 |
07 Feb 2017
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| | | PDF | 385 |
07 Feb 2017
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| | | ZIP | 435 |
07 Feb 2017
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| | | PDF | 90 |
07 Feb 2017
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