ADE7761B Energy Metering IC with On-Chip Fault and Missing Neutral Detection

The ADE7761B includes a power supply monitoring circuit on the VDD supply pin. Internal phase matching circuitry ensures that the voltage and current channels are matched. An internal no-load threshold ensures that the ADE7761B does not exhibit any creep when there is no load.

The ADE7761B is a high accuracy, fault-tolerant, electrical energy measurement IC intended for use with 2-wire distribution systems. The part specifications surpass the accuracy requirements as quoted in the IEC 62053-21 standard. The only analog circuitry used on the ADE7761B is in the ADCs and reference circuit. All other signal processing (such as multiplication and filtering) is carried out in the digital domain. This approach provides superior stability and accuracy over extremes in environmental conditions and over time. The ADE7761B incorporates a fault detection scheme similar to the ADE7751 by continuously monitoring both phase and neutral currents. A fault is indicated when the currents differ by more than 6.25%.

The ADE7761B incorporates a missing neutral detection scheme by continuously monitoring the input voltage. When a missing neutral condition is detected (no voltage input), the ADE7761B continues billing based on the active current signal (see the Missing Neutral Mode section). The missing neutral condition is indicated when the FAULT pin goes high. The ADE7761B supplies average active power information on the low frequency outputs, F1 and F2. The CF logic output gives instantaneous active power information.

Features and Benefits

High accuracy, active energy measurement IC supports IEC 62053-21
Less than 0.1% error over a dynamic range of 1000 to 1
Supplies active power on the frequency outputs, F1 and F2
High frequency output CF is intended for calibration and supplies instantaneous active power
Continuous monitoring of the phase and neutral current allows fault detection in 2-wire distribution systems
Current channel input level best suited for shunt and current transformer sensors

Uses the larger of the two currents (phase or neutral) to bill, even during a fault condition
Continuous monitoring of the voltage and current inputs allows missing neutral detection
Uses one current input (phase or neutral) to bill when missing neutral is detected
Two logic outputs (FAULT and REVP) can be used to indicate a potential miswiring, fault, or missing neutral condition
Direct drive for electromechanical counters and 2-phase stepper motors (F1 and F2)
Proprietary ADCs and DSP provide high accuracy over large variations in environmental conditions and time

Analog to Digital Converters

Data Sheets

Document	note
ADE7761B: Energy Metering IC with On-Chip Fault and Missing Neutral Detection Data Sheet (Rev. 0)	PDF 522 kB

Application Notes

Document	note
A Tamper-Resistant Watt-Hour Energy Meter (Rev. AN-563) AD7751 Reference Board Design in Gerber Format	PDF 348 kB
AN-687: A Low Cost Tamper-Resistant Energy Meter Based on the ADE7761 with Missing Neutral Function (Rev. 0)	PDF 762 kB
A Tamper-Resistant Watt-Hour Energy Meter Based on the AD7751 (Rev. AN-574)	PDF 625 kB