ADE7761BARSZ-RL【PDF 1/24 页】IC ENERGY METERING 1PHASE 20SSOP

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Energy Metering IC with On-Chip Fault and

Missing Neutral Detection

ADE7761B

FEATURES

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

Reference 2.5 V ± 8% (drift 30 ppm/°C typical) with external

overdrive capability

Single 5 V supply, low power

GENERAL DESCRIPTION

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.

The ADE7761B includes a power supply monitoring circuit on

the V DD 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.

FUNCTIONAL BLOCK DIAGRAM

PGA

AGND

FAULT

V DD

POWER

SUPPLY MONITOR

V 1A 2

ADC

A>B

HPF

ADE7761B

SIGNAL PROCESSING

V 1N 4

BLOCK

V 1B 3

MISCAL 7

V 2P 6

V 2N 5

ADC

B>A

A ≠ B

ZERO-CROSSING

DETECTION

MISSING NEUTRAL

GAIN ADJUST

MISSING NEUTRAL

DETECTION

LPF

2.5V

REFERENCE

3k ?

INTERNAL

OSCILLATOR

DIGITAL-TO-FREQUENCY CONVERTER

REF IN/OUT

RCLKIN

DGND

SCF

S0 REVP CF

Figure 1.

Rev. 0

Information furnished by Analog Devices is believed to be accurate and reliable. However, no

responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other

rights of third parties that may result from its use. Specifications subject to change without notice. No

license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

Trademarks and registered trademarks are the property of their respective owners.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781.329.4700 www.analog.com

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