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ADE7751
Using Equations 2 and 3, the real power P can be expressed in
terms of its fundamental real power ( P 1 ) and harmonic real
power ( P H ).
The analog inputs V1A, V1B, and V1N have the same maximum
signal level restrictions as V2P and V2N. However, Channel 1
has a programmable gain amplifier (PGA) with user-selectable
where:
P = P 1 + P H
gains of 1, 2, 8, or 16—see Table I. These gains facilitate easy
transducer interfacing.
P 1 = V 1 × I 1 cos( φ 1 )
φ 1 = α 1 – β 1
∞
and P H = ∑ V h × I h × cos( φ h )
h ≠ 1
(4)
(5)
Figure 5 illustrates the maximum signal levels on V1A, V1B,
and V1N. The maximum differential voltage is ± 660 mV divided
by the gain selection. Again, the differential voltage signal on the
inputs must be referenced to a common mode, e.g., AGND. The
maximum common-mode signal is ± 100 mV as shown in Figure 5.
φ h = α h – β h
As shown in Equation 5 above, a harmonic real power compo-
V1A, V1B
+660mV
GAIN
DIFFERENTIAL INPUT A
660mV/GAIN MAX PEAK
V1
V1A
nent is generated for every harmonic, provided that harmonic is
present in both the voltage and current waveforms. The power
factor calculation has been shown previously to be accurate in
V CM
COMMON MODE
100mV MAX
V CM
AGND
V1N
the case of a pure sinusoid, therefore the harmonic real power
must also correctly account for the power factor since it is made
up of a series of pure sinusoids.
–660mV
GAIN
DIFFERENTIAL INPUT B
660mV/GAIN MAX PEAK
V1
V1B
Note that the input bandwidth of the analog inputs is 14 kHz
with a master clock frequency of 3.5795 MHz.
Figure 5. Maximum Signal Levels, Channel 1
Table I.
ANALOG INPUTS
Channel V2 (Voltage Channel)
Maximum
The output of the line voltage transducer is connected to the
ADE7751 at this analog input. Channel V2 is a fully differen-
tial voltage input. The maximum peak differential signal on
Channel 2 is ± 660 mV. Figure 4 illustrates the maximum
signal levels that can be connected to the ADE7751 Channel 2.
G1
0
0
1
1
G0
0
1
0
1
Gain
1
2
8
16
Differential Signal
± 660 mV
± 330 mV
± 82 mV
± 41 mV
V2
+600mV
V2P
Typical Connection Diagrams
Figure 6 shows a typical connection diagram for Channel V1.
V CM
DIFFERENTIAL INPUT
600mV MAX PEAK
COMMON MODE
100mV MAX
V2
V CM
V2N
Here the analog inputs are being used to monitor both the
phase and neutral currents. Because of the large potential
difference between the phase and neutral, two CTs (current
transformers) must be used to provide the isolation. Notice
–600mV
AGND
both CTs are referenced to AGND (analog ground), hence
the common-mode voltage is 0 V. The CT turns ratio and
Figure 4. Maximum Signal Levels, Channel 2
Channel 2 must be driven from a common-mode voltage, i.e.,
burden resistor (Rb) are selected to give a peak differential
voltage of ± 660 mV/gain.
the differential voltage signal on the input must be referenced to
a common mode (usually AGND). The analog inputs of the
ADE7751 can be driven with common-mode voltages of up to
100 mV with respect to AGND. However, best results are
CT
Rb
Rf
660mV
GAIN
Cf
V1A
achieved using a common mode equal to AGND.
Channel V1 (Current Channel)
The voltage outputs from the current transducers are connected
IP
IN
AGND
Rb
660mV
GAIN
Cf
V1N
to the ADE7751 here. Channel V1 has two voltage inputs, namely
V1A and V1B. These inputs are fully differential with respect to
V1N. However, at any one time, only one is selected to perform
PHASE NEUTRAL
CT
Rf
V1B
the power calculation—see Fault Detection section.
REV. 0
–11 –
Figure 6. Typical Connection for Channel 1
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