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ADE7758
DI/DT CURRENT SENSOR AND DIGITAL
INTEGRATOR
The di/dt sensor detects changes in the magnetic field caused by
the ac current. Figure 42 shows the principle of a di/dt current
sensor.
MAGNETIC FIELD CREATED BY CURRENT
(DIRECTLY PROPORTIONAL TO CURRENT)
+ EMF (ELECTROMOTIVE FORCE)
80
81
82
83
84
85
86
87
88
89
90
91
Data Sheet
– INDUCED BY CHANGES IN
10
100
1k
10k
MAGNETIC FLUX DENSITY (di/dt)
Figure 42. Principle of a di/dt Current Sensor
The flux density of a magnetic field induced by a current is
directly proportional to the magnitude of the current. The
changes in the magnetic flux density passing through a conductor
loop generate an electromotive force (EMF) between the two
ends of the loop. The EMF is a voltage signal that is propor-
tional to the di/dt of the current. The voltage output from the
di/dt current sensor is determined by the mutual inductance
between the current carrying conductor and the di/dt sensor.
The current signal needs to be recovered from the di/dt signal
before it can be used. An integrator is therefore necessary to
restore the signal to its original form. The ADE7758 has a built-
in digital integrator to recover the current signal from the di/dt
sensor. The digital integrator on Channel 1 is disabled by default
5
4
3
2
1
0
FREQUENCY (Hz)
Figure 44. Combined Phase Response of the
Digital Integrator and Phase Compensator
when the ADE7758 is powered up. Setting the MSB of the
–1
40
45
50
55
60
65
70
GAIN[7:0] register turns on the integrator. Figure 43 to Figure 46
show the magnitude and phase response of the digital
integrator.
20
FREQUENCY (Hz)
Figure 45. Combined Gain Response of the
Digital Integrator and Phase Compensator (40 Hz to 70 Hz)
89.80
10
89.85
0
89.90
–10
–20
–30
89.95
90.00
–40
90.05
–50
10
100
FREQUENCY (Hz)
1k
10k
90.10
40
45
50
55
FREQUENCY (Hz)
60
65
70
Figure 43. Combined Gain Response of the
Digital Integrator and Phase Compensator
Rev. E | Page 20 of 72
Figure 46. Combined Phase Response of the
Digital Integrator and Phase Compensator (40 Hz to 70 Hz)
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