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Magnetically Immune Transformerless Power for Isolated Shunt Current Measurement Reference Design
(ACTIVE) TIDA-01094
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Key Document
- Magnetically Immune Transformerless Power Supply for Iso Shunt Current Ref Guide (Rev. A)
(PDF 16476 KB)
30 Jan 2017 60 views
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)
View the Important Notice for TI Designs covering authorized use, intellectual property matters and disclaimers.
