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71M6513/71M6513H Demo Board User’s Manual
The neutral current is available for display. The help text for the MR command describes how to display neutral
current on the display. For the "M" command of the CLI for current, phase 4 signifies the neutral current.
The accuracy data collected for several ALT_MUX_RATE settings is given in Table 1-14:
Test
Applied
ALT_MUX_RATE = 10 ALT_MUX_RATE = 25 ALT_MUX_RATE = 50
Number
Current
(252Hz)
measured
current error [%]
(100Hz)
measured
current error [%]
(51Hz)
measured
current error [%]
1
2
3
4
5
6
7
8
9
10
11
200
150
100
50
25
10
5
2.5
1
0.5
0.25
200.66 0.33 201.15 0.575 202.335 1.168
150.63 0.42 150.778 0.519 150.824 0.549
99.82 -0.18 99.765 -0.235 100.221 0.221
49.859 -0.282 49.76 -0.48 49.333 -1.334
24.889 -0.444 24.861 -0.556 24.951 -0.196
10.042 0.42 10.134 1.34 10.193 1.93
4.988 -0.24 5.132 2.64 5.155 3.1
2.486 -0.56 2.459 -1.64 2.535 1.4
1.036 3.6 1.067 6.7 1.071 7.1
0.564 12.8 0.581 16.2 0.592 18.4
0.324 29.6 0.328 31.2 0.334 33.6
Table 1-14: Neutral Current Accuracy at Various Sampling Frequencies
MPU (XDATA) address 0x027 represents the neutral current (RMS value). For the standard Demo Code
(revision 3.04), this address is a reserved location.
In the CE interface, the CE address 0x56 represents the 32-bit neutral current value, I3SQSUM. It has different
units than the current registers derived from the regular inputs IA, IB, and IC, because it is sampled at a
different rate (default = 1/10) than the other current channels, and because the reference is not VREF, but
VBIAS.
If one accumulates data for 250 samples (with XDATA address 0x0F=10) the accumulated data is transferred to
the MPU as one register on each XFER_BUSY interrupt. The values in between samples are equivalent to the
previous acquired sample value.
The actual LSB value for the neutral current measurement is computed from the following formula
LSB NC =
IMAX 2
431 ? 10 3 ? N ACC ? A 2 h
where:
IMAX is the numerical value of the current corresponding to 176mV RMS at the IC input,
NACC is the product of SUM_CYCLES and PRE_SAMPS ,
With IMAX = 208A and N ACC = 2520, LSB NC becomes 39.8*10 -6 /A 2 h.
Page: 41 of 112
? 2005-2006 TERIDIAN Semiconductor Corporation
Revision 5.6
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