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ADE7761B の電気的特性と機能
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ADE7761BのメーカーはAnalog Devicesです、この部品の機能は「Energy Metering IC」です。 |
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製品の詳細 ( Datasheet PDF )
| 部品番号 ADE7761B |
| 部品説明 Energy Metering IC |
| メーカ Analog Devices |
ロゴ |
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Energy Metering IC with On-Chip Fault and
Missing Neutral Detection
ADE7761B
FEATURES
GENERAL DESCRIPTION
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
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 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.
PGA AGND
13 8
FUNCTIONAL BLOCK DIAGRAM
FAULT
15
VDD
1
V1A 2
V1N 4
V1B 3
MISCAL 7
ADC
ADC
ADC
A>B
HPF
B>A
A≠B
ZERO-CROSSING
DETECTION
MISSING NEUTRAL
GAIN ADJUST
POWER
SUPPLY MONITOR
ADE7761B
SIGNAL PROCESSING
BLOCK
LPF
V2P 6
V2N 5
ADC
2.5V
3kΩ
REFERENCE
INTERNAL
OSCILLATOR
MISSING NEUTRAL
DETECTION
DIGITAL-TO-FREQUENCY CONVERTER
9
REFIN/OUT
14
RCLKIN
17
DGND
Figure 1.
10 11 12 16 18 19 20
SCF S1 S0 REVP CF F2 F1
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.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
©2007 Analog Devices, Inc. All rights reserved.
1 Page
ADE7761B
TABLE OF CONTENTS
Features .............................................................................................. 1
General Description ......................................................................... 1
Functional Block Diagram .............................................................. 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Timing Characteristics ................................................................ 4
Absolute Maximum Ratings............................................................ 5
Performance Issues That May Affect Billing Accuracy........... 5
ESD Caution.................................................................................. 5
Pin Configuration and Function Descriptions............................. 6
Typical Performance Characteristics ............................................. 8
Test Circuit ........................................................................................ 9
Terminology .................................................................................... 10
Theory of Operation ...................................................................... 11
Power Supply Monitor ............................................................... 11
REVISION HISTORY
8/07—Revision 0: Initial Version
Analog Inputs ............................................................................. 11
Internal Oscillator ...................................................................... 12
Analog-to-Digital Conversion.................................................. 13
Active Power Calculation .......................................................... 14
Digital-to-Frequency Conversion ............................................ 16
Transfer Function....................................................................... 16
Fault Detection ........................................................................... 17
Missing Neutral Mode ............................................................... 18
Applications Information .............................................................. 21
Interfacing to a Microcontroller for Energy Measurement .. 21
Selecting a Frequency for an Energy Meter Application ...... 21
Negative Power Information..................................................... 22
Outline Dimensions ....................................................................... 23
Ordering Guide .......................................................................... 23
Rev. 0 | Page 2 of 24
3Pages
ABSOLUTE MAXIMUM RATINGS
TA = 25°C, unless otherwise noted.
Table 3.
Parameter
VDD to AGND
Analog Input Voltage to AGND
V1A, V1B, V1N, V2N, V2P, MISCAL
Reference Input Voltage to AGND
Digital Input Voltage to DGND
Digital Output Voltage to DGND
Operating Temperature Range
Industrial
Storage Temperature Range
Junction Temperature
20-Lead SSOP, Power Dissipation
θJA Thermal Impedance
Lead Temperature, Soldering
Vapor Phase (60 sec)
Infrared (15 sec)
Rating
−0.3 V to +7 V
−6 V to +6 V
−0.3 V to VDD + 0.3 V
−0.3 V to VDD + 0.3 V
−0.3 V to VDD + 0.3 V
−40°C to +85°C
−65°C to +150°C
150°C
450 mW
112°C/W
215°C
220°C
Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
ADE7761B
PERFORMANCE ISSUES THAT MAY AFFECT
BILLING ACCURACY
The ADE7761B provides pulse outputs, CF, F1, and F2, that are
intended to be used for the billing of active energy. Pulses are
generated at these outputs in two different situations.
Case 1
When the analog input V2P − V2N complies with the conditions
described in Figure 34, the CF, F1, and F2 frequencies are
proportional to active power and can be used to bill active energy.
Case 2
When the analog input V2P − V2N does not comply with the
conditions described in Figure 34, the ADE7761B does not
measure active energy but a quantity proportional to kiloampere-
hours (kAh). This quantity is used to generate pulses on the
same CF, F1, and F2. This situation is indicated when the
FAULT pin is high.
Analog Devices, Inc., cautions users of the ADE7761B about the
following:
• Billing active energy in Case 1 is consistent with the under-
standing of the quantity represented by pulses on the CF, F1,
and F2 outputs (watthour).
• Billing active energy while the ADE7761B is in Case 2 must
be decided knowing that the entity measured by the ADE7761B
in this case is ampere-hour and not watthour. Users should
be aware of this limitation and decide if the ADE7761B is
appropriate for their application.
ESD CAUTION
Rev. 0 | Page 5 of 24
6 Page
合計 : 25 ページ |
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| 部品番号 | 部品説明 | メーカ |
| ADE7761 | Energy Metering IC | Analog Devices |
| ADE7761A | Energy Metering IC | Analog Devices |
| ADE7761B | Energy Metering IC | Analog Devices |