參數(shù)資料
型號(hào)： ADE7757AARZ
廠商： ANALOG DEVICES INC
元件分類(lèi)： 模擬信號(hào)調(diào)理
英文描述： SPECIALTY ANALOG CIRCUIT, PDSO16
封裝： LEAD FREE, MS-012AC, SOIC-16
文件頁(yè)數(shù)： 10/24頁(yè)
文件大?。?/td> 391K
代理商： ADE7757AARZ
ADE7757A
Preliminary Technical Data
Rev. PrE | Page 18 of 24
SELECTING A FREQUENCY FOR AN ENERGY METER APPLICATION
As shown in Table 5, the user can select one of four frequencies.
This frequency selection determines the maximum frequency
on F1 and F2. These outputs are intended for driving an energy
register (electromechanical or other). Because only four
different output frequencies can be selected, the available
frequency selection has been optimized for a meter constant
of 100 imp/kWh with a maximum current of between 10 A
and 120 A. Table 8 shows the output frequency for several
maximum currents (IMAX) with a line voltage of 220 V. In all
cases, the meter constant is 100 imp/kWh.
Table 8. F1 and F2 Frequency at 100 imp/kWh
IMAX (A)
F1 and F2 (Hz)
12.5
0.076
25.0
0.153
40.0
0.244
60.0
0.367
80.0
0.489
120.0
0.733
The F1–4 frequencies allow complete coverage of this range of
output frequencies (F1, F2). When designing an energy meter,
the nominal design voltage on Channel V2 (voltage) should be
set to half-scale to allow for calibration of the meter constant.
The current channel should also be no more than half-scale
when the meter sees maximum load. This allows over current
signals and signals with high crest factors to be accommodated.
Table 9 shows the output frequency on F1 and F2 when both
analog inputs are half-scale. The frequencies listed in Table 9
align very well with those listed in Table 8 for maximum load.
Table 9. F1 and F2 Frequency with Half-Scale AC Inputs
S1
S0
F1–4 (Hz)
Frequency on F1 and F2—
CH1 and CH2 Half-Scale AC Input1
0
0.86
0.051 × F1
0.044 Hz
0
1
1.72
0.051 × F2
0.088 Hz
1
0
3.43
0.051 × F3
0.176 Hz
1
6.86
0.051 × F4
0.352 Hz
1 Values are generated using the nominal frequency of 450 kHz.
When selecting a suitable F1–4 frequency for a meter design,
the frequency output at IMAX (maximum load) with a meter
constant of 100 imp/kWh should be compared with column
four of Table 9. The closest frequency in Table 9 determines
the best choice of frequency (F1–4). For example, if a meter
with a maximum current of 25 A is being designed, the output
frequency on F1 and F2 with a meter constant of 100 imp/kWh
is 0.153 Hz at 25 A and 220 V (from Table 8). In Table 9, the
closest frequency to 0.153 Hz in column four is 0.176 Hz.
Therefore, F3 (3.43 Hz) is selected for this design (see Table 5).
FREQUENCY OUTPUTS
Figure 2 shows a timing diagram for the various frequency
outputs. The outputs F1 and F2 are the low frequency outputs
that can be used to directly drive a stepper motor or
electromechanical impulse counter. The F1 and F2 outputs
provide two alternating low frequency pulses. The F1 and F2
pulse widths (t1) are set such that if they fall below 240 ms
(0.24 Hz) they are set to half of their period. The maximum
output frequencies for F1 and F2 are shown in Table 6.
The high frequency CF output is intended to be used for
communications and calibration purposes. CF produces a
90-ms-wide active high pulse (t4) at a frequency proportional
to active power. The CF output frequencies are given in Table 7.
As with F1 and F2, if the period of CF (t5) falls below 180 ms,
the CF pulse width is set to half the period. If the CF frequency,
for example, is 20 Hz, the CF pulse width is 25 ms.
When the high frequency mode is selected (that is, SCF = 0,
S1 = S0 = 1), the CF pulse width is fixed at 35 s. Therefore, t4
is always 35 s, regardless of output frequency on CF.
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參數(shù)描述
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