ADE7753: Active, Reactive, and Apparent Energy Metering IC with

The World Leader in High Performance Signal Processing Solutions
Multi-functional
Energy Metering IC
ADE7753 (Single Phase)
ADE7753:
A programmable solution for
Energy measurement
Transducers
ADE7753
Current
Voltage
LCD
Display
ADC
+ Fixed functions DSP
Energy
Measurements
MCU
Circuit
Breaker
Infrared
Interface
Billing information &
Meter control command
Power Line Carrier
Short-range RF
GSM cellular network
Application
ADE7753 Presentation
April-2003
Block Diagram
Data Communication
or
Automatic Meter Reading (AMR)
Quality
Features
Page 2 of 18
User interface
Simple Signal Processing
& Communication
ADE7753:
Technology at a glance
High Resolution Data
Conversion
D.C. to
5KHz
D.C. to
5KHz
16
16bit
bit
ADC
ADC
Fixed Function DSP
101011...
Digital-ToFrequency
Multiply
&
16
16 bit
bit
ADC
ADC
111001...
LPF
On
Onchip
chip
Temp.
Temp.sensor
sensor
A proven analog front end
from AD7755
Application
ADE7753 Presentation
April-2003
Block Diagram
Serial
Port
Interface
Superior DSP
Performance
Quality
Features
Page 3 of 18
Single Chip Energy Meter
Lowest Cost Single Phase Measurement
Single 5V
Power Supply
Connect directly to
current sensor
Connect directly to
voltage sensor
AD7751 or
AD7755
(Sensor Interface
& Calculation IC)
Frequency out
(Kilowatt-hours)
Quality brochure available:
http://www.analog.com/industry/energymeter/AD7755_Quality.pdf
http://www.analog.com/industry/energymeter/ADE7751_Quality.pdf
Application
ADE7753 Presentation
April-2003
Block Diagram
Quality
Features
Page 4 of 18
ADE7753:
Overview of Functionalities
‹ Surpasses
IEC1036 requirement. Less than 0.1% error
over a large current dynamic range
‹ Supplies the following information:
kW, kWHr
kV, kVarHr
VA
RMS Voltage and Current
Peak Voltage and Current
SAG detection
Line Period
Temperature
‹ Digital
calibration
Application
ADE7753 Presentation
April-2003
Block Diagram
Quality
Features
Page 5 of 18
ADE7753:
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
‹Accumulation Modes
Application
ADE7753 Presentation
April-2003
Block Diagram
Quality
Features
Page 6 of 18
ADE7753:
A validated Analog front end
16-bit accuracy from 2nd order SD ADC
‹ Linearity error < 0.1% over 1:1000 dynamic range
‹ (int. reference)
‹ Measurement Bandwidth 14 kHz
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Analog Front end
Current sensor
connection
Digital solution
RMS measurements
Active Energy
Apparent Energy
Calibration Mode
Reactive Energy
Power Line Quality
Temperature sensor
Accumulation Modes
Application
ADE7753 Presentation
April-2003
Block Diagram
Quality
Features
Page 7 of 18
ADE7753:
Easy use of Current sensors
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Analog Front end
Current sensor
connection
Digital solution
RMS measurements
Active Energy
Apparent Energy
Calibration Mode
Reactive Energy
Power Line Quality
Temperature sensor
Accumulation Modes
Application
ADE7753 Presentation
April-2003
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On-chip digital integrator in the current channel enables
direct interface to di/dt sensor (Rogowski coil)
Input Gain up to 64 to interface low shunt resistor
Gain of 16 recommended for 100mW
Phase compensation for CT connection
~ -1.71° to +0.58° max in 0.04° increments @ 50Hz
Block Diagram
Quality
Features
Page 8 of 18
ADE7753:
A Digital solution
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Analog Front end
Current sensor
connection
Digital solution
RMS measurements
Active Energy
Apparent Energy
Calibration Mode
Reactive Energy
Power Line Quality
Temperature sensor
Accumulation Modes
Application
ADE7753 Presentation
April-2003
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No manual calibration
Configuration done by writing ADE7753 registers
at power up
0.1% accuracy 1000:1
CF output to drive LED
Block Diagram
Quality
Features
Page 9 of 18
ADE7753:
Voltage and Current RMS,
and waveform samples
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Analog Front end
Current sensor
connection
Digital solution
RMS measurements
Active Energy
Apparent Energy
Calibration Mode
Reactive Energy
Power Line Quality
Temperature sensor
Accumulation Modes
Application
ADE7753 Presentation
April-2003
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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 speed (up to 28ksps)
Block Diagram
Quality
Features
Page 10 of 18
ADE7753:
Active Energy
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Analog Front end
Current sensor
connection
Digital solution
RMS measurements
Active Energy
Apparent Energy
Calibration Mode
Reactive Energy
Power Line Quality
Temperature sensor
Accumulation Modes
Application
ADE7753 Presentation
April-2003
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Accumulation of the Active Energy in a 24-bit register
→ Equivalent to 3.12min of Energy at Full scale
HPF filter eliminates any DC offset
Gain for calibration and multi-rate billing
(WGAIN and WDIV)
Block Diagram
Quality
Features
Page 11 of 18
ADE7753:
Apparent Energy (VA)
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Analog Front end
Current sensor
connection
Digital solution
RMS measurements
Active Energy
Apparent Energy
Calibration Mode
Reactive Energy
Power Line Quality
Temperature sensor
Accumulation Modes
Application
ADE7753 Presentation
April-2003
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Apparent Energy is calculated using: VA = Vrms x Irms
Accumulation of the Apparent Energy in a 24-bit register
Gain for calibration and multi-rate billing
(VAGAIN and VADIV)
Block Diagram
Quality
Features
Page 12 of 18
ADE7753:
Active and Apparent Energy
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Analog Front end
Current sensor
connection
Digital solution
RMS measurements
Active Energy
Apparent Energy
Calibration Mode
Reactive Energy
Power Line Quality
Temperature sensor
Accumulation Modes
Application
ADE7753 Presentation
April-2003
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Principle: Accumulation of the Active and Apparent Energy
over N half line cycles (<16384) → Drive IRQ when finished
Benefits:
• Cancel the ripple frequency effect (2 x line freq) in Energy
Measurement
• Shorten calibration time
E N E R G Y S a m p lin g tim e o f E n e rg y m e a s u re m e n t in C a lib ra tio n m o d e
t
A v e ra g e P o w e r
In s ta n ta n e o u s
Power
L in e V o lta g e
(C H 2 )
t
Block Diagram
Quality
Features
Page 13 of 18
ADE7753:
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Analog Front end
Current sensor
connection
Digital solution
RMS measurements
Active Energy
Apparent Energy
Calibration Mode
Reactive Energy
Power Line Quality
Temperature sensor
Accumulation Modes
Application
ADE7753 Presentation
April-2003
Reactive Energy (VAR) - 1
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Reactive Energy can be directly read from the
LVARENERGY[23:0]
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The sign of LVARENERGY indicates inductive or
capacitive loading
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kVarHr is updated synchronous to a programmable
number of voltage half-cycles to improve accuracy
Block Diagram
Quality
Features
Page 14 of 18
ADE7753:
Reactive Energy (VAR) - 2
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Analog Front end
Current sensor
connection
Digital solution
RMS measurements
Active Energy
Apparent Energy
Calibration Mode
Reactive Energy
Power Line Quality
Temperature sensor
Accumulation Modes
Application
ADE7753 Presentation
April-2003
Proposed Method to measure Reactive Energy and
Power Factor accurately:
‹ Using synchronous VA and kWHr data
kVarHr = √(VA – kWHr2) = √(LVAENERGY - LAENERGY2)
PF = sign(LVARENERGY) * LAENERGY/ LVAENERGY
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The nature of the load (inductive or capacitive) is
determined by the sign of LVARENERGY register
Block Diagram
Quality
Features
Page 15 of 18
ADE7753: Power Line Quality Supervisory
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Analog Front end
Current sensor
connection
Digital solution
RMS measurements
Active Energy
Apparent Energy
Calibration Mode
Reactive Energy
Power Line Quality
Temperature sensor
Accumulation Modes
Application
ADE7753 Presentation
April-2003
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Peak detection
SAG detection
Zero crossing
time out detection
Peak Level
SAG Level
Voltage Channel
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Period Measurement of the Voltage channel
Configurable SAG and Peak detections of the Voltage
channel
Actual peak values of Current and Voltage channels
available
Zero crossing of the Voltage channel
t
Zero crossing
detection
Block Diagram
Line Period
Quality
Features
Page 16 of 18
ADE7753:
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Analog Front end
Current sensor
connection
Digital solution
RMS measurements
Active Energy
Apparent Energy
Calibration Mode
Reactive Energy
Power Line Quality
Temperature sensor
Accumulation Modes
Application
ADE7753 Presentation
April-2003
Temperature Measurement
8-bit register : 1LSB/°C
‹ Temperature compensation of external components
‹ Temperature supervisory of the system
Block Diagram
Quality
Features
Page 17 of 18
ADE7753: Energy Accumulation Features
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Analog Front end
Current sensor
connection
Digital solution
RMS measurements
Active Energy
Apparent Energy
Calibration Mode
Reactive Energy
Power Line Quality
Temperature sensor
Accumulation Modes
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Positive Only Accumulation Mode – optional
Selectable Mode to accumulate positive active power
only or arithmetic accumulation of power
z
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UK requirement
No Load Threshold – built in feature
No accumulation below 0.001% of Full Scale Active
Power eliminates “creep”
Active Energy
Register
No-load
threshold
Active Power
No-load
threshold
Application
ADE7753 Presentation
April-2003
Block Diagram
Quality
Features
Page 18 of 18