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ADE7758 数据表(PDF) 21 Page - Analog Devices

部件名 ADE7758
功能描述  Poly Phase Multifunction Energy Metering IC with Per Phase Information
PDF  68 Pages
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制造商  AD [Analog Devices]
网页  http://www.analog.com
标志 AD - Analog Devices

ADE7758 数据表(HTML) 21 Page - Analog Devices

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ADE7758
Rev. A | Page 21 of 68
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)
– INDUCED BY CHANGES IN
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 proportional
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 switched on by
default when the ADE7758 is powered up. Setting the MSB of
the GAIN[7:0] register turns on the integrator. Figure 43 to
Figure 46 show the magnitude and phase response of the digital
integrator.
10
100
1k
10k
20
–50
–40
–30
–20
–10
0
10
FREQUENCY (Hz)
Figure 43. Combined Gain Response of the
Digital Integrator and Phase Compensator
10
100
1k
10k
80
91
90
89
88
87
86
85
84
83
82
81
FREQUENCY (Hz)
Figure 44. Combined Phase Response of the
Digital Integrator and Phase Compensator
40
70
65
60
55
50
45
5
–1
0
1
2
3
4
FREQUENCY (Hz)
Figure 45. Combined Gain Response of the
Digital Integrator and Phase Compensator (40 Hz to 70 Hz)
40
70
65
60
55
50
45
89.80
90.10
90.05
90.00
89.95
89.90
89.85
FREQUENCY (Hz)
Figure 46. Combined Phase Response of the
Digital Integrator and Phase Compensator (40 Hz to 70 Hz)



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