Multiphase Energy Measurement Reference Design Using Isolated Shunt Sensors

The TIDA-00601 design uses isolated shunt sensors to implement a Class 0.5% three-phase energy metering system. Isolation is achieved by using an isolated Delta-Sigma modulator with a capacitively isolated output circuit. The energy metering SoC takes different bit streams from the isolated modulator and uses its onboard digital filter to generate ADC sample readings. The energy metering SoC is also used to sense voltages, calculate metering parameter values, drive the board LCD, and communicate with the PC GUI via the board's isolated RS-232 circuitry.

characteristic

• ● Class 0.5% three-phase metering with galvanically isolated parallel current sensors
• ● Parallel isolation, working isolation voltage up to 1 kV AC, peak isolation voltage 7kV
• ● TI Energy Library firmware calculates all energy metering parameters, including active and reactive power and quantities, RMS current and voltage, power factor, and line frequency
• ● Isolated RS-232 with 2.5 kV RMS operating isolation boundary for communication with PC GUI
• ● Built-in 160-segment display for displaying metering parameters