ade7169f16 Analog Devices, Inc., ade7169f16 Datasheet - Page 46

• Manufacturer Part Number: ade7169f16
• Description: Single-phase Energy Measurement Ic With 8052 Mcu, Rtc And Lcd Driver
• Manufacturer: Analog Devices, Inc.

ADE7169F16
current. Figure 24 shows the 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, which 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
ADE7169F16 has a built-in digital integrator to recover the
current signal from the di/dt sensor. The digital integrator on
the Current Channel is switched off by default when the
ADE7169F16 is powered up. Setting INTE bit in the MODE1
register (0x0B) turns on the integrator. Figure 25 to Figure 28
show the magnitude and phase response of the digital
integrator.
–10
–20
–30
–40
–50
10
0
Figure 24. Principle of a di/dt Current Sensor
Digital Integrator and Phase Compensator
Figure 25. Combined Gain Response of the
10
2
MAGNETIC FIELD CREATED BY CURRENT
(DIRECTLY PROPORTIONAL TO CURRENT)
FREQUENCY (Hz)
+ EMF (ELECTROMOTIVE FORCE)
– INDUCED BY CHANGES IN
MAGNETIC FLUX DENSITY (di/dt)
10
3
02875-0-036
02875-0-035
Rev. PrD | Page 46 of 140
Note that the integrator has a –20 dB/dec attenuation and an
approximately –90° phase shift. When combined with a di/dt
–89.70
–89.75
–89.80
–89.85
–89.90
–89.95
–90.00
–90.05
–1.0
–1.5
–2.0
–2.5
–3.0
–3.5
–4.0
–4.5
–5.0
–5.5
–6.0
–88.0
–88.5
–89.0
–89.5
–90.0
–90.5
Digital Integrator and Phase Compensator (40 Hz to 70 Hz)
Digital Integrator and Phase Compensator (40 Hz to 70 Hz)
40
40
Figure 26. Combined Phase Response of the
Figure 28. Combined Phase Response of the
Digital Integrator and Phase Compensator
Figure 27. Combined Gain Response of the
45
45
Preliminary Technical Data
10
50
2
50
FREQUENCY (Hz)
FREQUENCY (Hz)
FREQ
FREQUENCY (Hz)
55
55
60
60
10
3
65
65
02875-0-038
02875-0-037
02875-0-039
70
70