Datasheet ADE7754 Datasheet (ANALOG DEVICES)

The World Leader in High Performance Signal Processing Solutions

Multi-functional Polyphase

Energy Metering IC with Serial

Port Interface

ADE7754

Energy Measurement Group

Precision Converters (PRC) Division

ADE7754: A programmable solution for Polyphase Energy measurementTransducers

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ADE7754: Technology at a glance

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ADE7754: Overview of Functionalities

• Surpasses IEC1036 requirement. Less than 0.1% error

over wide dynamic range

• Supplies the following information:

 Active energy
 Sign of Reactive energy
 Apparent energy
 Simultaneous RMS calculation on the six analog inputs
 Peak Voltage and Current detection
 SAG Line Voltage detection
 Line Period
 Temperature

• Digital calibration

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ADE7754: Characteristics

• 24-pin SOIC package

• 5V Power Supply

• [-40 C; +85 C] Temperature Operating range

• 500mV maximum analog input range with PGA of 1, 2 or 4

on all channels

• External Clock frequency = 10MHz

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ADE7754: Block Diagram

• Analog Front end

• Current sensor connection

• Digital solution

• Active Energy

• Calibration Mode

• RMS measurements

• Apparent Energy

• Reactive Energy

• Power Line Quality

• Temperature sensor

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ADE7754: A validated Analog front end

• Analog Front end

• Current sensor connection

• Digital solution

• RMS measurements

• Active Energy

• Apparent Energy

• Calibration Mode

• Reactive Energy

• Power Line Quality

• Temperature sensor

• 16-bit accuracy from 2nd order ΣΔ ADCs

• Linearity error < 0.1% over wide dynamic

range (int. reference)

• Measurement Bandwidth 14 kHz

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ADE7754: Easy use of Current sensors

• Analog Front end

• Current sensor connection

• Digital solution

• RMS measurements

• Active Energy

• Apparent Energy

• Calibration Mode

• Input Gain up to 4

• Reactive Energy

• Power Line Quality

• Temperature sensor

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• Phase compensation for CT connection

~ +/-0.5°max in 0.02°increment @ 50Hz

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ADE7754: A Digital solution

• Configuration done by writing ADE7754 registers at power up

• Analog Front end

• Current sensor connection

• Digital solution

• RMS measurements

• Active Energy

• Apparent Energy

• Calibration Mode

• Reactive Energy

• Power Line Quality

• Temperature sensor

• Only one point calibration to reach 0.5% accuracy for active energy

• CF output to drive LED

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ADE7754: Voltage and Current RMS, and waveform

samples

• Analog Front end

• Current sensor connection

• Digital solution

• RMS measurements

• Active Energy

• Apparent Energy

• Calibration Mode

• Reactive Energy

• Power Line Quality

• Temperature sensor

• Simultaneous Voltage and Current RMS values in 24-bit registers

• Offsets compensate RMS noise integration and improve accuracy

• Real-time voltage and current waveforms can be supplied in four

different sampling speeds (up to 28ksps)

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ADE7754: Active Energy – Signal Path

• Analog Front end

• Current sensor connection

• Digital solution

• RMS measurements

• Active Energy

• Apparent Energy

• Calibration Mode

• Reactive Energy

• Power Line Quality

• Temperature sensor

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ADE7754: Active Energy – Description

• Analog Front end

• Current sensor connection

• Digital solution

• RMS measurements

• Active Energy

• Apparent Energy

• Calibration Mode

• Reactive Energy

• Power Line Quality

• Temperature sensor

• Accumulation of the Total Active Energy in a 24-bit register

=> Equivalent to 88s of Energy at Full scale

• HPF filter eliminates any DC offset

• Gain for calibration and multi-rate billing

• Different Modes to accumulate active energy in different meter

configuration

Mode 1. 3-phase 4-wire Wye service
Mode 2. 3-phase 4-wire Wye service 2 Voltage sensors
Mode 3. 3-phase 3-wire Delta service
Mode 4. 3-phase 4-wire Delta service

- See configurability

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ADE7754: Active Energy – Description

• Analog Front end

• Current sensor connection

• Digital solution

• RMS measurements

• Active Energy

• Apparent Energy

• Calibration Mode

• Reactive Energy

• Power Line Quality

• Temperature sensor

• No-load threshold per phase for anti-

creep 0.005% of Full scale

• Sum of absolute energies for anti-

tampering Option selectable

• Instantaneous Reverse Active Power per

phase

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ADE7754: Apparent Energy (VAh) – Signal path

• Analog Front end

• Current sensor connection

• Digital solution

• RMS measurements

• Active Energy

• Apparent Energy

• Calibration Mode

• Reactive Energy

• Power Line Quality

• Temperature sensor

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ADE7754: Apparent Energy (VAh) – Description

• Apparent power is calculated using: VA = Vrms x Irms

• Analog Front end

• Current sensor connection

• Digital solution

• RMS measurements

• Active Energy

• Apparent Energy

• Calibration Mode

• Reactive Energy

• Power Line Quality

• Temperature sensor

• Accumulation of the Apparent Energy in a 24-bit register

=> Equivalent to 131s of Energy at Full scale

• Gain for calibration and multi-rate billing

• Different Modes to accumulate apparent energy in different meter

configuration

Mode 1. 3-phase 4-wire Wye service
Mode 2. 3-phase 4-wire Wye service 2 Voltage sensors
Mode 3. 3-phase 3-wire Delta service
Mode 4. 3-phase 4-wire Delta service

- See configurability

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ADE7754: Active and Apparent Energy

• Principle: Accumulation of the Active and Apparent Energy over

• Analog Front end

• Current sensor connection

• Digital solution

• RMS measurements

• Active Energy

• Apparent Energy

• Calibration Mode

• Reactive Energy

• Power Line Quality

• Temperature sensor

N half line cycles (<16384) => Drive IRQ when finished

• Benefits:

- Cancels the ripple frequency effect (2 x line freq) in Energy
Measurement

- Shorten calibration time

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ADE7754: Reactive Energy (VAR) – 1

• Analog Front end

• Current sensor connection

• Digital solution

• RMS measurements

• Active Energy

• Apparent Energy

• Calibration Mode

• Reactive Energy

• Power Line Quality

• Temperature sensor

• Sign of Reactive Energy can be directly read from

the LVARENERGY[23:0]

• The sign of LVARENERGY indicates inductive or

capacitive loading

• LVARENERGY is updated synchronous to a

programmable number of voltage half-cycles to
improve accuracy

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ADE7754: Reactive Energy (VAR)-2

• Analog Front end

• Current sensor connection

• Digital solution

• RMS measurements

• Active Energy

• Apparent Energy

• Calibration Mode

• Reactive Energy

• Power Line Quality

• Temperature sensor

• Proposed Method to measure Reactive

Energy and Power Factor including harmonics:

Using synchronous VAh and Wh data

Varh = √(VAh2–Wh2) = √(LVAENERGY2-LAENERGY2)
PF = sign(LVARENERGY) * LAENERGY/ LVAENERGY

The nature of the load (inductive or capacitive) is determined
by the sign of LVARENERGY register

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ADE7754: Power Line Quality Supervisory

• Period Measurement of any Voltage channel

• Analog Front end

• Current sensor connection

• Digital solution

• Configurable SAG and Peak detections of the Voltage channels

• Zero crossing of the Voltage channels

• RMS measurements

• Active Energy

• Apparent Energy

• Calibration Mode

• Reactive Energy

• Power Line Quality

• Temperature sensor

¾ General supervisory of each lines’ Voltage quality

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ADE7754: Temperature Measurement

• Analog Front end

• Current sensor connection

• Digital solution

• RMS measurements

• Active Energy

• Apparent Energy

• Calibration Mode

• Reactive Energy

• Power Line Quality

8-bit register : 1LSB/°C

• Temperature compensation of external

• Temperature sensor

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components

• Temperature supervisory of the system

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3-phase Product Comparison

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APPENDIX: Meter Configurations

Mode 1: 3-phase 4-Wire Wye service
Mode 2: 3-phase 4-Wire Wye service 2 voltage sensors
Mode 3: 3-phase 3-Wire Delta service
Mode 4: 3-phase 4-Wire Delta service

Mode 1: 3-phase 4-Wire Wye service

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Mode 2: 3-phase 4-Wire Wye service

2 voltage sensors

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Mode 3: 3-phase 3-Wire Delta service

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Mode 4: 3-phase 4-Wire Delta service

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