參數(shù)資料
型號： ADE7761
廠商： Analog Devices, Inc.
英文描述： Energy Metering IC with On-Chip Fault and Missing Neutral Detection
中文描述： 電能計量IC片故障檢測和失蹤中性
文件頁數(shù)： 21/28頁
文件大?。?/td> 302K
代理商： ADE7761
ADE7761
Rev. A | Page 21 of 28
V
1B
V
1N
V
1A
R
F
R
F
C
F
C
F
CT
CT
RB
RB
0V
V1A
*RB + VR = RF
VR*
RB*
RA*
V
2P
R
F
V
2N
C
T
C
F
0
LOAD
240V RMS
POWER
GENERATOR
IB
Figure 29. Missing Neutral System Diagram
The ADE7761 detects a missing neutral condition by continu-
ously monitoring the voltage channel input (V
2P
–V
2N
). The
FAULT pin is held high when a missing neutral condition is
detected. In this mode, the ADE7761 continues to bill the
energy based on the signal level on the current channel (see
Figure 30). The billing rate or frequency outputs can be adjusted
by changing the dc level on the MISCAL pin.
V
1A
V
1N
V
1B
MISSING NEUTRAL
GAIN ADJUSMENT
DIGITAL-
TO-
FREQUENCY
CONVERTERS
CF
F1
F2
0
ZERO
CROSSING
DETECTION
A > B
B > A
B <> A
ADC
ADC
ADC
MISCAL
LPF
HPF
Figure 30. Energy Calculation in Missing Neutral Mode
Important Note for Billing of Active Energy
The ADE7761 provides pulse outputs—CF, F1, and F2—
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 V
2P
– V
2N
complies with the
conditions described in Figure 32, CF, F1, and F2 frequencies
are proportional to active power and can be used to bill active
energy.
Case 2:
When the analog input V
2P
– V
2N
does not comply with
the conditions described in Figure 32, the ADE7761 does not
measure active energy, but a quantity proportional to 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 ADE7761:
Billing active energy in Case 1 is consistent with the
understanding of the quantity represented by pulses on
CF, F1, and F2 outputs (watt-hour).
Billing active energy while the ADE7761 is in Case 2 must
be decided knowing that the entity measured by the
ADE7761 in this case is ampere-hour and not watt-hour.
Users should be aware of this limitation and decide if the
ADE7761 is appropriate for their application.
Missing Neutral Detection
The ADE7761 continuously monitors the voltage input and
detects a missing neutral condition when the voltage input peak
value is smaller than 9% of the analog full scale or when no zero
crossings are detected on this input (see Figure 31).
0V
FS
FS
0V
FS
0
9% OF FS
0V
FILTER AND
THRESHOLD
V2
V
2P
V
2N
AGND
ADC
MISSING
NEUTRAL
|V2|
PEAK
< 9% OF FULL SCALE
V
2P
–V
2N
V
2P
–V
2N
V
2P
–V
2N
NO ZERO-CROSSING ON V2
OR
Figure 31. Missing Neutral Detection
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