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ADE7933 Arkusz danych(PDF) 2 Page - Analog Devices

Numer części ADE7933
Szczegółowy opis  Isolated Energy Metering Chipset for Polyphase Shunt Meters
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Producent  AD [Analog Devices]
Strona internetowa  http://www.analog.com
Logo AD - Analog Devices

ADE7933 Arkusz danych(HTML) 2 Page - Analog Devices

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ADE7978/ADE7933/ADE7932
Data Sheet
Rev. 0 | Page 2 of 120
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
Typical Application Circuit ............................................................. 1
Revision History ............................................................................... 3
General Description ......................................................................... 4
Functional Block Diagrams............................................................. 5
Specifications..................................................................................... 7
System Specifications, ADE7978 and ADE7933/ADE7932 ... 7
ADE7978 Specifications .............................................................. 9
ADE7933/ADE7932 Specifications.......................................... 13
Absolute Maximum Ratings.......................................................... 16
Thermal Resistance .................................................................... 16
ESD Caution................................................................................ 16
Pin Configurations and Function Descriptions ......................... 17
Typical Performance Characteristics ........................................... 21
Test Circuit ...................................................................................... 26
Terminology .................................................................................... 27
Theory of Operation ...................................................................... 30
ADE7933/ADE7932 Analog Inputs......................................... 30
Analog-to-Digital Conversion.................................................. 30
Current Channel ADC............................................................... 32
Voltage Channel ADCs.............................................................. 35
Changing the Phase Voltage Datapath .................................... 39
Reference Circuits ...................................................................... 39
Phase Compensation.................................................................. 40
Digital Signal Processor............................................................. 41
Power Quality Measurements....................................................... 42
Zero-Crossing Detection........................................................... 42
Period Measurement.................................................................. 44
Phase Voltage Sag Detection..................................................... 45
Peak Detection............................................................................ 46
Overvoltage and Overcurrent Detection................................. 47
Neutral Current Mismatch........................................................ 48
Root Mean Square Measurement ................................................. 49
Current RMS Calculation.......................................................... 49
Voltage RMS Calculation .......................................................... 50
Voltage RMS in Delta Configurations ..................................... 51
Active Power Calculation .............................................................. 52
Total Active Power Calculation ................................................ 52
Fundamental Active Power Calculation.................................. 53
Active Power Gain Calibration................................................. 53
Active Power Offset Calibration............................................... 54
Sign of Active Power Calculation............................................. 54
Active Energy Calculation ........................................................ 54
Integration Time Under Steady Load...................................... 55
Energy Accumulation Modes ................................................... 56
Line Cycle Active Energy Accumulation Mode ..................... 56
Reactive Power Calculation .......................................................... 58
Total Reactive Power Calculation ............................................ 58
Fundamental Reactive Power Calculation.............................. 58
Reactive Power Gain Calibration ............................................. 58
Reactive Power Offset Calibration........................................... 58
Sign of Reactive Power Calculation ......................................... 59
Reactive Energy Calculation..................................................... 59
Integration Time Under Steady Load...................................... 60
Energy Accumulation Modes ................................................... 61
Line Cycle Reactive Energy Accumulation Mode ................. 61
Apparent Power Calculation......................................................... 62
Apparent Power Gain Calibration............................................ 62
Apparent Power Offset Calibration ......................................... 62
Apparent Power Calculation Using VNOM........................... 62
Apparent Energy Calculation ................................................... 63
Integration Time Under Steady Load...................................... 64
Energy Accumulation Mode..................................................... 64
Line Cycle Apparent Energy Accumulation Mode................ 64
Power Factor Calculation and Total Harmonic
Distortion Calculation................................................................... 65
Power Factor Calculation.......................................................... 65
Total Harmonic Distortion Calculation.................................. 66
Waveform Sampling Mode............................................................ 67
Energy-to-Frequency Conversion................................................ 68
TERMSELx[2:0] Bits.................................................................. 68
CFxSEL[2:0] Bits ........................................................................ 68
Energy-to-Frequency Conversion Process ............................. 69


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