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參數(shù)資料
| 型號： | ADE7761AARSZ-RL |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 模擬信號調(diào)理 |
| 英文描述： | Energy Metering IC with On-Chip Fault and Missing Neutral Detection |
| 中文描述： | SPECIALTY ANALOG CIRCUIT, PDSO20 |
| 封裝： | LEAD FREE, M0-150AE, SSOP-20 |
| 文件頁數(shù)： | 19/24頁 |
| 文件大?。?/td> | 367K |
| 代理商： | ADE7761AARSZ-RL |
ADE7761A
Rev. 0 | Page 19 of 24
V
1B
V
1N
V
1A
R
F
R
F
C
F
C
F
CT
CT
RB
RB
0V
V
1A
1
RB + VR = RF.
VR
1
RB
1
RA
1
V
2P
R
F
V
2N
C
T
C
F
0
LOAD
244V rms
POWER
GENERATOR
IB
Figure 31. Missing Neutral System Diagram
The ADE7761A detects a missing neutral condition by
continuously 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 ADE7761A continues to bill the
energy based on the signal level on the current channel (see
Figure 32). 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 ADJUSMTENT
DIGITAL-TO-
FREQUENCY
CONVERTERS
CF
F1
F2
0
ZERO
CROSSING
DETECTION
A > B
B > A
B <> A
ADC
ADC
ADC
MISCAL
LPF
HPF
Figure 32. Energy Calculation in Missing Neutral Mode
Important Note for Billing of Active Energy
The ADE7761A 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 34, 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 34, the ADE7761A 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 ADE7761A about the
following:
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 ADE7761A is in Case 2 must
be decided knowing that the entity measured by the
ADE7761A in this case is ampere-hour and not watt-hour.
Users should be aware of this limitation and decide if the
ADE7761A is appropriate for their application.
Missing Neutral Detection
The ADE7761A 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 33).
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 33. Missing Neutral Detection
The ADE7761A leaves the missing neutral mode for normal
operation when both conditions are no longer valid, that is, a
voltage peak value of greater than 9% of full scale and zero
crossing on the voltage channel is detected (see Figure 34).
0
FILTER AND
THRESHOLD
V2
V
2P
V
2N
AGND
ADC
MISSING
NEUTRAL
|V2|
PEAK
> 9% OF FULL SCALE
AND
ZERO CROSSING ON V2
FS
+9% OF FS
–9% OF FS
V
2P
– V
2N
Figure 34. Return to Normal Mode after Missing Neutral Detection
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ADE7761 | Energy Metering IC with On-Chip Fault and Missing Neutral Detection |
| ADE7761ARS | Energy Metering IC with On-Chip Fault and Missing Neutral Detection |
| ADE7761ARS-REF | Energy Metering IC with On-Chip Fault and Missing Neutral Detection |
| ADE7761ARSRL | Energy Metering IC with On-Chip Fault and Missing Neutral Detection |
| ADE7769 | Energy Metering IC with Integrated Oscillator and No-Load Indication |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADE7761ARS | 制造商:Rochester Electronics LLC 功能描述: 制造商:Analog Devices 功能描述: |
| ADE7761ARS-REF | 制造商:Analog Devices 功能描述:ENERGY METER IC W/FAULT&MNEUT DETEC. - Bulk |
| ADE7761ARSRL | 制造商:AD 制造商全稱:Analog Devices 功能描述:Energy Metering IC with On-Chip Fault and Missing Neutral Detection |
| ADE7761B | 制造商:AD 制造商全稱:Analog Devices 功能描述:Energy Metering IC with On-Chip Fault and Missing Neutral Detection |
| ADE7761BARS | 制造商:Rochester Electronics LLC 功能描述: 制造商:Analog Devices 功能描述: |
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