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AS8218 датащи(PDF) 119 Page - ams AG

номер детали AS8218
подробное описание детали  Highly Integrated Single Phase 2 Current Energy Metering Integrated Circuits
PDF  123 Pages
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производитель  AMSCO [ams AG]
домашняя страница  http://www.ams.com
Logo AMSCO - ams AG

AS8218 датащи(HTML) 119 Page - ams AG

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Data Sheet AS8218 / AS8228
Revision 3.0, 31-May-06
Page 119 of 123
Where fmains is the mains frequency and fOSC is the oscillator frequency.
Phase correction factor with a power factor (PF) of less than 1:
The meter has been calibrated at PF = 1 and the error is approximately 0 for Ical (calibration current). If the PF
is reduced, the effect of phase differences results in an increased error (‘phase_error’):
First, the related phase shift in degrees can be calculated using the following formula:
[ ]
°
−
⎟⎟
⎠
⎞
⎜⎜
⎝
⎛
°
×
⎟
⎠
⎞
⎜
⎝
⎛ +
=
60
60
cos
100
%
error
_
phase
1
cos
arc
shift
_
phase
Where the phase_error is the measured error in percentage and cosΦ is the phase angle.
For phase_error = 9.2[%] the phase_shift is 3.0°.
For fosc = 3.579545MHz and fmains = 50Hz one phase correction unit represents 2.41’, which is
0.04023°.
Thus the phase correction factor must be set to
units
57
.
74
04023
.
0
0
.
3
=
°
°
= 75 units.
The pcorr register has to be set to 4bh.
RMS values from the voltage (sos_v) and current (sos_i1 and sos_i2):
∑
=
=
nsamp
1
i
2
i
rms
V
nsamp
1
V
, where
∑
=
nsamp
1
i
2
i
V
is the sos_v value
∑
=
=
nsamp
1
i
2
i
rms
I
nsamp
1
I
,
where
∑
=
nsamp
1
i
2
iI
is the sos_i value
Where nsamp, the number of samples before an update rate of the MDR (meter data register), is selected to
achieve coherent sampling.
16-bit calibration values for the voltage (V) and current (I) channels:
The ideal values after RMS calculations of voltage (Vin of 100mVp at rated conditions) and current and (Iin of
30mVp at rated conditions when Gain = 20) are:
RMS_V(ideal) = 479 (rms)
RMS_I (ideal) = 292,100 (rms)



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