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Home » NEWEST Products » New by Manufacturer » Analog Devices Inc. » ADE7978 3-Phase Metrology IC - Analog Devices
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Analog Devices ADE7978 3-Phase Metrology IC for Polyphase Shunt Meters

Analog Devices ADE7978 3-Phase Metrology IC
for Polyphase Shunt Meters

Analog Devices ADE7978 is a high accuracy, 3-phase electrical energy measurement IC with serial interfaces and three flexible pulse outputs. The ADE7978 can interface with up to four ADE7933/ ADE7932 devices. The device incorporates all the signal processing required to perform total (fundamental and harmonic) active, reactive, and apparent energy measurement and rms calculations, as well as fundamental-only active and reactive energy measurement and rms calculations. A fixed function digital signal processor (DSP) executes this signal processing. ADE7978 measures the active, reactive, and apparent energy in various 3-phase configurations, such as wye or delta services, with both three and four wires. The device provides system calibration features for each phase, gain calibration, and optional offset correction. Phase compensation is also available, but it is not necessary because the currents are sensed using shunts. The CF1, CF2, and CF3 logic outputs provide a wide selection of power information: total active, reactive, and apparent powers; the sum of the current rms values; and fundamental active and reactive powers.

Features
  • Enables shunt current sensors in polyphase energy meters
  • Immune to magnetic tampering
  • Highly accurate; supports EN 50470-1, EN 50470-3, IEC 62053-21, IEC 62053-22, IEC 62053-23, ANSI C12.20, and IEEE 1459 standards
  • Compatible with 3-phase, 3- or 4-wire (delta or wye) meters and other 3-phase services
  • Computes active, reactive, and apparent energy on each phase and on the overall system
  • Less than 0.2% error in active and reactive energy over a dynamic range of 2000 to 1 at TA = 25°C
  • Less than 0.1% error in voltage rms over a dynamic range of 500 to 1 at TA = 25°C
Applications
  • Shunt-based polyphase meters
  • Power quality monitoring
  • Solar inverters
  • Process monitoring
  • Protective devices
  • Isolated sensor interfaces
  • Industrial PLCs
Functional Block Diagram
Functional Block Diagram
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