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ADE7752B
NO-LOAD THRESHOLD
The ADE7752B includes an innovative no-load threshold detection
scheme that detects if a current input, when multiplied with any
of the three voltages inputs, cannot create power larger than a no-
load threshold. This threshold represents 0.0075% of the full-
scale output frequency.
For example, if the A, B and C voltage phases are 50% of full-
scale input and 120° apart, and Current Phase A is 10% of full
scale with a PF = 0, this detection scheme detects that V A × I A is
The no-load threshold is given as 0.0075% of the full-scale output
frequency for each of the f 1 to 7 frequencies (see Table 10). For
example, for an energy meter with a 100 imp/kWhr meter
constant using f 1 to 7 (4.49 Hz), the minimum output frequency
at F1 or F2 is 1.38 × 10 ?4 Hz. This is 2.21 × 10 ?3 Hz at CF
(16 × F1 Hz). In this example, the no-load threshold is equiva-
lent to 4.8 W of load, or a start-up current of 20.7 mA at 240 V.
Table 10. CF, F1, and F2 Minimum Frequency at No-Load
Threshold
below the no-load threshold but that V B × I A and V C × I A are not.
Therefore, the ADE7752B does not detect a no-load threshold
for V A × I A and lets this phase contribute to the total power.
However, in the same voltage conditions, if current Phase A is
0.0075% of full scale with a PF = 1, this detection scheme detects
that V A × I A is below the no-load threshold and because V B × I A
and V C × I A are as well, V A × I A is detected as below the no-load
threshold and its contribution to the total power is stopped.
SCF
0
1
0
1
0
1
0
1
S1
0
0
0
0
1
1
1
1
S0
0
0
1
1
0
0
1
1
F1, F2 Minimum (Hz)
6.92E ? 05
1.38E ? 04
3.46E ? 05
1.38E ? 04
1.57E ? 04
3.46E ? 05
1.73E ? 05
1.753 ? 05
CF Minimum (Hz)
1.11E ? 03
1.11E ? 03
1.11E ? 03
2.21E ? 03
2.51E ? 02
5.53E ? 04
5.53E ? 04
2.77E ? 04
Rev. 0 | Page 23 of 24
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