This reference design demonstrates a unique approach for extending current measurement range using a single shunt and voltage measurement AMC1304Mx5 isolated delta-sigma (ΔΣ) modulator. With careful selection of a low-value shunt resistor that minimizes power dissipation, a front-end amplifier with low noise and by introducing two gain paths, both upper and lower current limit is extended. Accuracy of < ±0.5 % for both current and voltage measurement is achieved by interfacing the modulator output to AM437x host processor which performs the Sinc3 filtering.
A fully assembled board has been developed for testing and performance validation only, and is not available for sale.
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Detailed schematic diagram for design layout and components
Complete listing of design components, reference designators, and manufacturers/part numbers
Detailed overview of design layout for component placement
Detailed overview of design layout for component placement
Files used for 3D models or 2D drawings of IC components
Design file that contains information on physical board layer of design PCB
PCB layer plot file used for generating PCB design layout
Includes TI products in the design and potential alternatives.
| Type | Title | Date | |
|---|---|---|---|
| * | User guide | Wide Input Current Using Shunts and Voltage Measurement for Protection Relays | Dec. 04, 2015 |
| Technical article | A smarter way for solar to power the grid – think inside the box | May 05, 2016 |
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