參數(shù)資料
型號(hào)： ADE7761ARS-REF
廠商： ANALOG DEVICES INC
元件分類： 模擬信號(hào)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： MO-150AE, SSOP-20
文件頁(yè)數(shù)： 16/28頁(yè)
文件大小： 302K
代理商： ADE7761ARS-REF
ADE7761
The low frequency output of the ADE7761 is generated by
accumulating this active power information. This low frequency
inherently means a long accumulation time between output
pulses. The output frequency is, therefore, proportional to the
average active power. This average active power information can
in turn be accumulated (for example, by a counter) to generate
active energy information. Because of its high output frequency
and therefore shorter integration time, the CF output is propor-
tional to the instantaneous active power. This is useful for
system calibration purposes that would take place under steady
load conditions.
Rev. A | Page 16 of 28
0
F2
CF
F1
DIGITAL-TO-
FREQUENCY
DIGITAL-TO-
FREQUENCY
HPF
MULTIPLIER
LPF
ADC
ADC
CH1
CH2
INSTANTANEOUS
POWER SIGNAL –p(t)
INSTANTANEOUS
ACTIVE POWER SIGNAL
V × I
V × I
2
TIME
p(t) = i(t).v(t)
WHERE:
v(t) = V × cos(
t)
i(t) = I × cos(
t)
p(t) =V2
t)}
Figure 20. Signal Processing Block Diagram
Power Factor Considerations
The method used to extract the active power information from
the instantaneous power signal (by low-pass filtering) is still
valid even when the voltage and current signals are not in
phase. Figure 21 displays the unity power factor condition and
a displacement power factor (DPF = 0.5), that is, current signal
lagging the voltage by 60°. If one assumes that the voltage and
current waveforms are sinusoidal, the active power component
of the instantaneous power signal (dc term) is given by
(
V
×
I
/2) × cos(60°)
This is the correct active power calculation.
INSTANTANEOUS
POWER SIGNAL
INSTANTANEOUS
ACTIVE POWER SIGNAL
INSTANTANEOUS
POWER SIGNAL
INSTANTANEOUS
ACTIVE POWER SIGNAL
60°
CURRENT
CURRENT
VOLTAGE
0V
0V
VOLTAGE
0
V × I
2
V × I
2
× cos(60°)
Figure 21. Active Power Calculation over PF
Nonsinusoidal Voltage and Current
The active power calculation method also holds true for
nonsinusoidal current and voltage waveforms. All voltage and
current waveforms in practical applications have some
harmonic content. Using the Fourier transform, instantaneous
voltage and current waveforms can be expressed in terms of
their harmonic content:
)
sin(
2
)
(
0
h
h
h
O
t
h
V
V
t
v
α
+
ω
×
×
+
=
∑
≠
∞
(1)
where:
v(t)
is the instantaneous voltage.
V
O
is the average value.
V
h
is the rms value of voltage harmonic
h.
α
h
is the phase angle of the voltage harmonic.
)
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.
相關(guān)PDF資料
PDF描述
ADE7761ARSRL Energy Metering IC with On-Chip Fault and Missing Neutral Detection
ADE7769 Energy Metering IC with Integrated Oscillator and No-Load Indication
ADE7769AR Energy Metering IC with Integrated Oscillator and No-Load Indication
ADE7769AR-REF Energy Metering IC with Integrated Oscillator and No-Load Indication
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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:
ADE7761BARS-REF 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-RL 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
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