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 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 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 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 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 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 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 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 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 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) 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 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 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 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: 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 Reactive Energy can be directly read from the LVARENERGY[23:0] The sign of LVARENERGY indicates inductive or capacitive loading 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 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 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 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 Peak detection SAG detection Zero crossing time out detection Peak Level SAG Level Voltage Channel 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: 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 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 Positive Only Accumulation Mode – optional Selectable Mode to accumulate positive active power only or arithmetic accumulation of power z 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
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