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參數(shù)資料
| 型號： | ADE7761AARS-REF |
| 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)： | 15/24頁 |
| 文件大小： | 367K |
| 代理商： | ADE7761AARS-REF |
ADE7761A
Rev. 0 | Page 15 of 24
)
sin(
2
)
(
0
h
h
h
O
t
h
I
I
t
β
+
ω
×
×
+
=
∑
≠
∞
(2)
where:
i(t)
is the instantaneous current.
I
O
is the dc component.
I
h
is the rms value of current harmonic
h.
β
h
is the phase angle of the current harmonic.
Using Equation 1 and Equation 2, the active power P can be
expressed in terms of its fundamental active power (P
1
) and
harmonic active power (P
H
).
P
=
P
1
+
P
H
where:
P
1
=
V
1
×
I
1
cos(Φ
1
)
Φ
1
= α
1
β
1
(3)
and
)
cos(
2
∑
=
h
α
∞
Φ
×
×
=
h
h
h
H
I
V
P
h
h
h
β
=
Φ
(4)
As can be seen in Equation 4, a harmonic active power component
is generated for every harmonic provided that the harmonic is
present in both the voltage and current waveforms. The power
factor calculation was previously shown to be accurate in the
case of a pure sinusoid; therefore, the harmonic active power
must also correctly account for the power factor because it is
made up of a series of pure sinusoids.
Note that the input bandwidth of the analog inputs is 7 kHz
with an internal oscillator frequency of 450 kHz.
HPF and Offset Effects
Equation 5 shows the effect of offsets on the active power
calculation. Figure 24 shows the effect of offsets on the active
power calculation in the frequency domain.
)
(
)
(
I
I
t
V
V
1
0
1
0
×
+
×
)
cos(
)
cos(
2
))
cos(
(
))
cos(
V
1
(
t
I
V
t
I
V
I
I
V
t
t
I
t
V
0
1
1
0
1
1
0
ω
×
×
+
ω
×
×
+
=
ω
×
+
×
ω
×
+
=
×
(5)
As can be seen in Equation 5 and Figure 24, an offset on Channel 1
and Channel 2 contributes a dc component after multiplication.
Because this dc component is extracted by the LPF and used to
generate the active power information, the offsets contribute a
constant error to the active power calculation. This problem is
easily avoided in the ADE7761A with the HPF in Channel 1. By
removing the offset from at least one channel, no error component
can be generated at dc by the multiplication. Error terms at cos(ω
t
)
are removed by the LPF and the digital-to-frequency conversion
(see the Digital-to-Frequency Conversion section).
The HPF in Channel 1 has an associated phase response that is
compensated for on-chip. Figure 25 and Figure 26 show the
phase error between channels with the compensation network
activated. The ADE7761A is phase compensated up to 1 kHz as
shown, which ensures a correct active harmonic power calculation
even at low power factors.
0
DC COMPONENT (INCLUDING ERROR TERM)
IS EXTRACTED BY THE LPF FORACTIVE
POWER CALCULATION
2
ω
FREQUENCY (RAD/S)
0
V
1
× I
0
V
0
× I
1
V
1
× I
1
2
Figure 24. Effect of Channel Offsets on the Active Power Calculation
FREQUENCY (Hz)
0
100
P
–0.05
–0.10
0
0.05
0.10
0.15
0.20
0.25
0.30
200
300
400
500
600
700
800
900
1000
0
Figure 25. Phase Error Between Channels (0 Hz to 1 kHz)
FREQUENCY (Hz)
40
P
–0.05
–0.10
0.05
0
0.10
0.15
0.20
0.25
0.30
45
50
55
60
65
70
0
Figure 26. Phase Error Between Channels (40 Hz to 70 Hz)
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ADE7761AARS-RL | Energy Metering IC with On-Chip Fault and Missing Neutral Detection |
| ADE7761AARSZ | Energy Metering IC with On-Chip Fault and Missing Neutral Detection |
| ADE7761AARSZ-RL | Energy Metering IC with On-Chip Fault and Missing Neutral Detection |
| ADE7761 | Energy Metering IC with On-Chip Fault and Missing Neutral Detection |
| ADE7761ARS | Energy Metering IC with On-Chip Fault and Missing Neutral Detection |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADE7761AARS-RL | 制造商:Analog Devices 功能描述:Energy Measurement 20-Pin SSOP T/R |
| ADE7761AARSZ | 功能描述:IC ENERGY METERING 1PHASE 20SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 能量測量 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:* |
| ADE7761AARSZ-RL | 功能描述:IC ENERGY METERING 1PHASE 20SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 能量測量 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:* |
| 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 |
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