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參數(shù)資料
| 型號： | EVAL-ADE7755EB |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Energy Metering IC with Pulse Output |
| 中文描述： | 電能計(jì)量IC輸出脈沖 |
| 文件頁數(shù)： | 11/16頁 |
| 文件大?。?/td> | 331K |
| 代理商： | EVAL-ADE7755EB |
REV. 0
ADE7755
–11–
Using Equations 1 and 2, the real power
P
can be expressed in
terms of its fundamental real power (
P
1
) and harmonic real
power (
P
H
).
P
P
P
H
=
+
1
where:
P
V
I
1
1
1
1
1
1
1
=
￥
=
cos
–
f
f
a
b
(3)
and:
P
Vh
1
–
Ih
h
h
h
h
H
h
=
￥
=
π
cos
f
f
a
b
(4)
As can be seen from Equation 4 above, a harmonic real power
component is generated for every harmonic, provided that har-
monic is present in both the voltage and current waveforms.
The power factor calculation has previously been shown to be
accurate in the case of a pure sinusoid; therefore the harmonic
real power must also correctly account for the power factor
since it is made up of a series of pure sinusoids.
Note that the input bandwidth of the analog inputs is 14kHz
with a master clock frequency of 3.5795 MHz.
ANALOG INPUTS
Channel V1 (Current Channel)
The voltage output from the current transducer is connected to
the ADE7755 here. Channel V1 is a fully differential voltage
input. V1P is the positive input with respect to V1N.
The maximum peak differential signal on Channel 1 should be
less than
±
470 mV (330 mV rms for a pure sinusoidal signal) for
specified operation. Note that Channel 1 has a programmable
gain amplifier (PGA) with user selectable gain of 1, 2, 8, or 16
(see Table I). These gains facilitate easy transducer interfacing.
DIFFERENTIAL INPUT
470mV MAX PEAK
+470mV
AGND
V
CM
V1
V1P
V
CM
–470mV
COMMON-MODE
100mV MAX
V1N
V1
Figure 4. Maximum Signal Levels, Channel 1, Gain = 1
The diagram in Figure 4 illustrates the maximum signal levels
on V1P and V1N. The maximum differential voltage is
±
470 mV
divided by the gain selection. The differential voltage signal on
the inputs must be referenced to a common mode, e.g., AGND.
The maximum common-mode signal is
±
100 mV as shown in
Figure 4.
Table I. Gain Selection for Channel 1
Maximum
Differential Signal
±
470 mV
±
235 mV
±
60 mV
±
30 mV
G1
G0
Gain
0
0
1
1
0
1
0
1
1
2
8
16
Channel V2 (Voltage Channel)
The output of the line voltage transducer is connected to the
ADE7755 at this analog input. Channel V2 is a fully differential
voltage input. The maximum peak differential signal on
Channel 2 is
±
660 mV. Figure 5 illustrates the maximum
signal levels that can be connected to the ADE7755 Channel 2.
DIFFERENTIAL INPUT
660mV MAX PEAK
+660mV
AGND
V
CM
V2
V2P
V
CM
–660mV
COMMON-MODE
100mV MAX
V2N
V2
Figure 5. Maximum Signal Levels, Channel 2
Channel 2 must be driven from a common-mode voltage, i.e.,
the differential voltage signal on the input must be referenced to
a common mode (usually AGND). The analog inputs of the
ADE7755 can be driven with common-mode voltages of up to
100 mV with respect to AGND. However, best results are
achieved using a common mode equal to AGND.
Typical Connection Diagrams
Figure 6 shows a typical connection diagram for Channel V1. A
CT (current transformer) is the current transducer selected for this
example. Notice the common-mode voltage for Channel 1 is
AGND and is derived by center tapping the burden resistor to
AGND. This provides the complementary analog input signals
for V1P and V1N. The CT turns ratio and burden resistor Rb
are selected to give a peak differential voltage of
±
470 mV/Gain
at maximum load.
V1P
AGND
470mV
GAIN
Rb
Rf
Rf
CT
NEUTRAL
PHASE
IP
V1N
Cf
Cf
Figure 6. Typical Connection for Channel 1
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| EVAL-ADE7755EBZ | 制造商:AD 制造商全稱:Analog Devices 功能描述:Energy Metering IC with Pulse Output |
| EVAL-ADE7755EBZ1 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Energy Metering IC with Pulse Output |
| EVAL-ADE7755ZEB | 功能描述:BOARD EVALUATION FOR AD7755 RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評估演示板和套件 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 主要目的:電信，線路接口單元（LIU） 嵌入式:- 已用 IC / 零件:IDT82V2081 主要屬性:T1/J1/E1 LIU 次要屬性:- 已供物品:板，電源，線纜，CD 其它名稱:82EBV2081 |
| EVAL-ADE7756EB | 制造商:Analog Devices 功能描述:EVAL BD DOCUMENTATION ADE7756 ENERGY METERING IC - Bulk 制造商:Rochester Electronics LLC 功能描述: |
| EVAL-ADE7757AEBZ | 制造商:Analog Devices 功能描述:EVALUATION BOARDS - Bulk |
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