- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄373980 > ADE7760ARS (ANALOG DEVICES INC) Energy Metering IC with On-Chip Fault Detection PDF資料下載
參數(shù)資料
| 型號： | ADE7760ARS |
| 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 Detection |
| 中文描述： | SPECIALTY ANALOG CIRCUIT, PDSO20 |
| 封裝： | MO-150AE, SSOP-20 |
| 文件頁數(shù)： | 16/24頁 |
| 文件大?。?/td> | 514K |
| 代理商： | ADE7760ARS |
ADE7760
The output frequency on CF can be up to 2048 times higher
than the frequency on F1 and F2. This higher output frequency
is generated by accumulating the instantaneous active power
signal over a much shorter time while converting it to a
frequency. This shorter accumulation period means less
averaging of the cos(2ω
t
) component. As a consequence, some
of this instantaneous power signal passes through the digital-to-
frequency conversion. This is not a problem in the application.
Where CF is used for calibration purposes, the frequency
should be averaged by the frequency counter, which removes
any ripple. If CF is being used to measure energy, such as in a
microprocessor-based application, the CF output should also be
averaged to calculate power. Because the outputs F1 and F2
operate at a much lower frequency, a lot more averaging of the
instantaneous active power signal is carried out. The result is a
greatly attenuated sinusoidal content and a virtually ripple-free
frequency output.
Rev. 0 | Page 16 of 24
TRANSFER FUNCTION
Frequency Outputs F1 and F2
The ADE7760 calculates the product of two voltage signals (on
Channel 1 and Channel 2) 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, 0.34 Hz maximum for ac signals with S0 = S1 = 0
(see Table 7). This means that the frequency at these outputs is
generated from active power information accumulated over a
relatively long period of time. 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:
2
2
70
.
REF
4
1
rms
rms
V
1
F
V2
V1
Frequency
F
F
×
×
×
=
(7)
where:
F
1
F
2
Frequency
is the output frequency on F1 and F2 (Hz).
V1
rms
is the differential rms voltage signal on Channel 1 (V).
V2
rms
is the differential rms voltage signal on Channel 2 (V).
V
REF
is the reference voltage (2.5 V ± 8%) (V).
F
1–4
is one of four possible frequencies selected by using the
logic inputs S0 and S1 (see Table 5).
Table 5. F
1–4
Frequency Solution
S1
S0
0
0
0
1
1
0
1
1
1
Values are generated using the nominal frequency of 450 kHz.
2
F
1–4
are a binary fraction of the master clock and, therefore, varies, if the
internal oscillator frequency (OSC).
Frequency Output CF
The pulse output calibration frequency (CF) is intended for use
during calibration. The output pulse rate on CF can be up to
2048 times the pulse rate on F1 and F2. The lower the F
1–4
frequency selected, the higher the CF scaling. Table 6 shows
how the two frequencies are related, depending on the states of
the logic inputs S0, S1, and SCF. Because of its relatively high
pulse rate, the frequency at this logic output is proportional to
the instantaneous active power. As with F1 and F2, the fre-
quency is derived from the output of the low-pass filter after
multiplication. However, because the output frequency is high,
this active power information is accumulated over a much
shorter time. Therefore, less averaging is carried out in the
digital-to-frequency conversion. With much less averaging of
the active power signal, the CF output is much more responsive
to power fluctuations (see Figure 17).
F
1–4
(Hz)
1
1.72
3.44
6.86
13.7
OSC/CLKIN
2
OSC/2
18
OSC/2
17
OSC/2
16
OSC/2
15
Table 6. Relationship between CF and F1, F2 Frequency
Outputs
SCF
S1
S0
F
1–4
(Hz)
1
0
0
1.72
0
0
0
1.72
1
0
1
3.44
0
0
1
3.44
1
1
0
6.86
0
1
0
6.86
1
1
1
13.7
0
1
1
13.7
Example
In this example, if ac voltages of ±660 mV peak are applied to
V1 and V2, then the expected output frequency on CF, F1, and
F2 is calculated as follows:
CF Frequency output
128 × F1, F2
64 × F1, F2
64 × F1, F2
32 × F1, F2
32 × F1, F2
16 × F1, F2
16 × F1, F2
2048 × F1, F2
F
1–4
= 1.7 Hz,
SCF
=
S1
=
S0
= 0
V1
rms
= rms of 660 mV peak ac = 0.66/√2 V
V2
rms
= rms of 660 mV peak ac = 0.66/√2 V
V
REF
= 2.5 V (nominal reference value)
相關PDF資料 |
PDF描述 |
|---|---|
| ADE7762 | Polyphase Energy Metering IC with Phase Drop Indication |
| ADE7762ARW | Polyphase Energy Metering IC with Phase Drop Indication |
| ADE7762ARW-RL | Polyphase Energy Metering IC with Phase Drop Indication |
| ADE7762ARWZ | Polyphase Energy Metering IC with Phase Drop Indication |
| ADE7762ARWZ-RL | Polyphase Energy Metering IC with Phase Drop Indication |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| ADE7760ARSRL | 制造商:Analog Devices 功能描述:Energy Measurement 20-Pin SSOP T/R 制造商:Analog Devices 功能描述:ENERGY METER IC W/ONCHIP FAULT & OSCIL. - Tape and Reel |
| ADE7761 | 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 |
| ADE7761A | 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 |
| ADE7761AARS | 制造商:Analog Devices 功能描述:Energy Measurement 20-Pin SSOP 制造商:Rochester Electronics LLC 功能描述: |
| ADE7761AARS-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 |
發(fā)布緊急采購，3分鐘左右您將得到回復。