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參數(shù)資料
| 型號(hào)： | ADE7752BARW |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 模擬信號(hào)調(diào)理 |
| 英文描述： | Polyphase Energy Metering IC with Pulsed Output |
| 中文描述： | SPECIALTY ANALOG CIRCUIT, PDSO24 |
| 封裝： | MS-013AD, SOIC-24 |
| 文件頁(yè)數(shù)： | 22/27頁(yè) |
| 文件大小： | 342K |
| 代理商： | ADE7752BARW |
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ADE7752B
Preliminary Technical Data
TRANSFER FUNCTION
FREQUENCY OUTPUTS F1 AND F2
The ADE7752B calculates the product of six voltage signals (on
current channel and voltage channel) and then low-pass filters
this product to extract active power information. This active
power information is then converted to a frequency. The
frequency information is output on F1 and F2 in the form of
active high pulses. The pulse rate at these outputs is relatively
low, for example, 2.01 Hz maximum for ac signals with SCF =
S0 = 0; S1 = 1 (see Table 6). This means that the frequency at
these outputs is generated from active power information
accumulated over a relatively long period. The result is an
output frequency that is proportional to the average active
power. The averaging of the active power signal is implicit to
the digital-to-frequency conversion. The output frequency or
pulse rate is related to the input voltage signals by the following
equation:
(
BN
A
AN
V
Rev. PrA | Page 22 of 27
)
2
REF
7
1
C
CN
B
F
I
V
I
V
I
V
181
.
Freq
×
×
+
×
+
×
×
=
(11)
where:
Freq
= output frequency on F1 and F2 (Hz).
V
AN,
V
BN,
and
V
CN
= differential rms voltage signal on voltage
channels (V).
I
A
,
I
B
,
and
I
C
= differential rms voltage signal on current channels
(V).
V
REF
= the reference voltage (2.4 V ±8%) (V).
F
1–7
= one of seven possible frequencies selected by using the
logic inputs SCF, S0, and S1 (see Table 5).
Table 5. F
1–7
Frequency Selection
1
SCF
S1
0
0
1
0
0
0
1
0
0
1
1
1
0
1
1
1
S0
0
0
1
1
0
0
1
1
F
1–7
(Hz)
2.30
4.61
1.15
4.61
5.22
1.15
0.58
0.58
1
F
1–7
is a fraction of the master clock and therefore varies if the specified
CLKIN frequency is altered.
Example 1
Thus, if full-scale differential dc voltages of +500 mV are
applied to VA, VB, VC, IA, IB, and IC, respectively (500 mV is
the maximum differential voltage that can be connected to
current and voltage channels), then the expected output
frequency is calculated as follows:
F
1–7
= 0.58 Hz, SCF = S0 = S1 = 1
V
AN
= V
BN
= V
CN
= IA = IB = IC
= 500 mV dc = 0.5 V(rms of dc = dc)
V
REF
= 2.4 V (nominal reference value)
Note that if the on-chip reference is used, actual output
frequencies can vary from device to device due to reference
tolerance of ±8%.
Hz
467
.
4
58
.
5
2
5
×
181
.
3
Freq
=
×
×
×
=
(12)
Example 2
In this example, with ac voltages of ±500 mV peak applied to
the voltage channels and current channels, the expected output
frequency is calculated as follows:
(
)
value
reference
nominal
V
4
V
Vrms
2
5
AC
peak
mV
500
IC
IB
IA
V
V
V
1
1
S
0
S
SCF
,
Hz
=
58
.
=
F
REF
CN
BN
AN
7
1
=
=
=
=
=
=
=
=
=
=
(13)
Note that if the on-chip reference is used, actual output fre-
quencies can vary from device to device due to reference
tolerance of ±8%.
Hz
233
.
4
2
2
58
.
2
5
×
5
×
181
.
3
Freq
=
×
×
×
×
=
(14)
As can be seen from these two example calculations, the maximum
output frequency for ac inputs is always half of that for dc input
signals. The maximum frequency also depends on the number of
phases connected to the ADE7752B. In a 3-phase 3-wire delta ser-
vice, the maximum output frequency is different from the maxi-
mum output frequency in a 3-phase 4-wire Wye service. The
reason is that there are only two phases connected to the analog
inputs, but also that in a delta service, the current channel input
and voltage channel input of the same phase are not in phase in
normal operation.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADE7752BARW-RL | 制造商:AD 制造商全稱:Analog Devices 功能描述:Polyphase Energy Metering IC with Pulsed Output |
| ADE7752BARWZ | 功能描述:IC ENERGY METERING 3PHASE 24SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 能量測(cè)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:* |
| ADE7752BARWZ-RL | 功能描述:IC ENERGY METERING 3PHASE 24SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 能量測(cè)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:* |
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