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ADE7752B
ACCUMULATION OF 3-PHASE POWER
Power Measurement Considerations
Calculating and displaying power information always have some
associated ripple that depends on the integration period used in the
MCU to determine average power as well as the load. For example,
at light loads, the output frequency can be 10 Hz. With an integra-
tion period of 2 seconds, only about 20 pulses are counted. The
possibility of missing one pulse always exists because the
ADE7752B output frequency is running asynchronously to the
MCU timer. This results in a 1-in-20 or 5% error in the power
measurement. To remedy this, an appropriate integration time
should be considered to achieve the desired accuracy.
Mode Selection of the Sum of the Three Active Energies
The ADE7752B can be configured to execute the arithmetic
sum of the three active energies, Wh = Wh ΦA + Wh ΦB + Wh ΦC ,
or the sum of the absolute value of these energies, Wh = |Wh ΦA |
+ |Wh ΦB | + |Wh ΦC |. The selection between the two modes can
be made by setting the ABS pin. Logic high and logic low
applied on the ABS pin correspond to the arithmetic sum and
the sum of absolute values, respectively.
When the sum of the absolute values is selected, the active
energy from each phase is always counted positive in the total
tion where the sign of the active power should always be the
same. If the meter is misconnected to the power lines, that is, if
CT is connected in the wrong direction, the total active energy
recorded without this solution can be reduced by two-thirds.
The sum of the absolute values assures that the active energy
recorded represents the actual active energy delivered. In this
mode, the reverse power pin still detects when the arithmetic
sum of the active powers is negative, but energy continues to
accumulate regardless of the sign.
Negative Total Power Detection
The ADE7752B detects when total power, calculated as the
arithmetic sum of the three phases, is negative. This detection
is independent of the mode of sum of the three powers (arithmetic
or absolute). This mechanism can detect an incorrect connec-
tion of the meter or generation of negative active energy. When
the sum of the powers of the three phases is negative, the REVP
pin output goes active high. When the sum of the powers of the
three phases is positive, the REVP pin output is reset to low.
The REVP pin output changes state at the same time as a pulse
is issued on CF. If the sum of the powers of the three phases is
negative, then the REVP pin output stays high until the sum is
positive or all three phases are below the no-load threshold.
active energy. It is particularly useful in 3-phase, 4-wire installa-
Rev. 0 | Page 19 of 24
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