Magnetically Immune Transformerless Power for Isolated Shunt Current Measurement Reference Design
TIDA-01094
This product has been released to the market and is available for purchase. For some products, newer alternatives may be available.
This product has been released to the market and is available for purchase. For some products, newer alternatives may be available.
See Also
Isolated Shunt Current Measurement with Standalone Digital Filters Reference Design
Use standalone digital filters for enabling using microcontrollers without digital filters.
See the Important Notice and Disclaimer covering reference designs and other TI resources.
Key Document
- Magnetically Immune Transformerless Power Supply for Iso Shunt Current Ref Guide (Rev. A)
(PDF 16476 KB)
30 Jan 2017
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)
See the Important Notice and Disclaimer covering reference designs and other TI resources.
