Isolated Energy Metering Chipset for Polyphase Shunt Meters Data Sheet ADE7978/ADE7933/ADE7932/ADE7923 2 FEATURES Flexible I C, SPI, and HSDC serial interfaces Safety and regulatory approvals Enables shunt current sensors in polyphase energy meters UL recognition Immune to magnetic tampering 5000 V rms for 1 minute per UL 1577 Highly accurate supports EN 50470-1, EN 50470-3, CSA Component Acceptance Notice 5A IEC 62053-21, IEC 62053-22, IEC 62053-23, ANSI C12.20, IEC 61010-1: 300 V rms maximum working voltage and IEEE 1459 standards VDE certificate of conformity Compatible with 3-phase, 3- or 4-wire (delta or wye) meters DIN V VDE V 0884-10 (VDE V 0884-10):2006-12 and other 3-phase services V = 846 V peak IORM Computes active, reactive, and apparent energy on each Optional isolated (ADE7933/ADE7932) or nonisolated phase and on the overall system (ADE7923) neutral Less than 0.2% error in active and reactive energy over a dynamic range of 2000 to 1 at T = 25C A APPLICATIONS Less than 0.1% error in voltage rms over a dynamic range Shunt-based polyphase meters of 500 to 1 at T = 25C A Power quality monitoring Less than 0.25% error in current rms over a dynamic range Solar inverters of 500 to 1 at T = 25C A Process monitoring Power quality measurements including total harmonic Protective devices distortion (THD) Isolated sensor interfaces Single 3.3 V supply Industrial PLCs Operating temperature: 40C to +85C TYPICAL APPLICATION CIRCUIT PHASE PHASE PHASE ISOLATION NEUTRAL A B C BARRIER V1P 3.3V VM IM PHASE A ADE7932/ ADE7933 IP V2P GND GND ISO A MCU V1P 3.3V VM IM PHASE B ADE7932/ ADE7933 IP 3.3V 3.3V V2P 2 ADE7978 I C/HSDC OR SPI GND GND ISO B MCU ENERGY METERING IRQ0, IRQ1 V1P 3.3V IC VM IM PHASE C ADE7932/ GND GND MCU MCU ADE7933 IP V2P GND GND ISO C MCU V1P 3.3V NEUTRAL VM LINE IM ADE7923 (OPTIONAL, NONISOLATED) IP V2P LOAD GND MCU Figure 1. 3-Phase, 4-Wire Meter with Three ADE7933/ADE7932 Devices, One ADE7923, and One ADE7978 1 Protected by U.S. Patents 5,952,849 6,873,065 7,075,329 6,262,600 7,489,526 7,558,080 and 8,892,933. Other patents are pending. Rev. D Document Feedback Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. rights of third parties that may result from its use. Specifications subject to change without notice. No Tel: 781.329.4700 20132018 Analog Devices, Inc. All rights reserved. license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. Technical Support www.analog.com DIGITAL INTERFACE SYSTEM MICROCONTROLLER 11116-001ADE7978/ADE7933/ADE7932/ADE7923 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Peak Detection ............................................................................ 51 Applications ....................................................................................... 1 Overvoltage and Overcurrent Detection ................................ 52 Typical Application Circuit ............................................................. 1 Neutral Current Mismatch ........................................................ 53 Revision History ............................................................................... 4 Root Mean Square Measurement ................................................. 54 General Description ......................................................................... 5 Current RMS Calculation ......................................................... 54 Functional Block Diagrams ............................................................. 6 Voltage RMS Calculation .......................................................... 55 Specifications ..................................................................................... 8 Voltage RMS in Delta Configurations ..................................... 56 System Specifications, ADE7978 and Active Power Calculation .............................................................. 57 ADE7933/ADE7932/ADE7923 .................................................. 8 Total Active Power Calculation ................................................ 57 ADE7978 Specifications ............................................................ 10 Fundamental Active Power Calculation .................................. 58 ADE7933/ADE7932 Specifications .......................................... 14 Active Power Gain Calibration ................................................. 58 ADE7923 Specifications ............................................................ 17 Active Power Offset Calibration ............................................... 59 Absolute Maximum Ratings .......................................................... 19 Sign of Active Power Calculation ............................................. 59 Thermal Resistance .................................................................... 19 Active Energy Calculation ........................................................ 59 ESD Caution ................................................................................ 19 Integration Time Under Steady Load ...................................... 60 Pin Configurations and Function Descriptions ......................... 20 Energy Accumulation Modes ................................................... 61 Typical Performance Characteristics ........................................... 25 Line Cycle Active Energy Accumulation Mode ..................... 61 Total Energy Linearity over Supply and Temperature ........... 25 Reactive Power Calculation .......................................................... 63 Fundamental Energy and RMS Linearity with Fifth Total Reactive Power Calculation ............................................ 63 Harmonic over Supply and Temperature ................................ 26 Fundamental Reactive Power Calculation .............................. 63 Total Energy Error over Frequency .......................................... 27 Reactive Power Gain Calibration ............................................. 63 RMS Linearity over Temperature and RMS Error over Reactive Power Offset Calibration ........................................... 63 Frequency .................................................................................... 28 Sign of Reactive Power Calculation ......................................... 64 Energy Linearity Repeatability ................................................. 29 Reactive Energy Calculation ..................................................... 64 Cumulative Histograms of ADC Gain Temperature Coefficients.................................................................................. 30 Integration Time Under Steady Load ...................................... 65 Test Circuit ...................................................................................... 31 Energy Accumulation Modes ................................................... 66 Terminology .................................................................................... 32 Line Cycle Reactive Energy Accumulation Mode ................. 66 Theory of Operation ...................................................................... 35 Apparent Power Calculation ......................................................... 67 ADE7933/ADE7932/ADE7923 Analog Inputs ...................... 35 Apparent Power Gain Calibration............................................ 67 Analog-to-Digital Conversion .................................................. 35 Apparent Power Offset Calibration ......................................... 67 Current Channel ADC............................................................... 37 Apparent Power Calculation Using VNOM ........................... 67 Voltage Channel ADCs .............................................................. 39 Apparent Energy Calculation ................................................... 68 Changing the Phase Voltage Datapath .................................... 44 Integration Time Under Steady Load ...................................... 69 Reference Circuits ...................................................................... 44 Energy Accumulation Mode ..................................................... 69 Phase Compensation .................................................................. 45 Line Cycle Apparent Energy Accumulation Mode ................ 69 Digital Signal Processor ............................................................. 46 Power Factor Calculation and Total Harmonic Distortion Calculation ...................................................................................... 70 Power Quality Measurements ....................................................... 47 Power Factor Calculation .......................................................... 70 Zero-Crossing Detection ........................................................... 47 Total Harmonic Distortion Calculation .................................. 71 Period Measurement .................................................................. 49 Waveform Sampling Mode ............................................................ 72 Phase Voltage Sag Detection ..................................................... 50 Rev. D Page 2 of 125