ADE75 datasheet(48/148 Pages) AD

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ADE75xx/ADE71xx

Preliminary Technical Data

Rev. PrE | Page 48 of 148

MAGNETIC FIELD CREATED BY CURRENT

(DIRECTLY PROPORTIONAL TO CURRENT)

+ EMF (ELECTROMOTIVE FORCE)

– INDUCED BY CHANGES IN

MAGNETIC FLUX DENSITY (di/dt)

02875-0-035

Figure 24. 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

ADE75xx/ADE71xx 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

ADE75xx/ADE71xx 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.

FREQUENCY (Hz)

–10

–20

–30

–40

–50

102

103

02875-0-036

Figure 25. Combined Gain Response of the

Digital Integrator and Phase Compensator

FREQUENCY (Hz)

102

103

02875-0-037

FREQ

–88.0

–88.5

–89.0

–89.5

–90.0

–90.5

Figure 26. Combined Phase Response of the

Digital Integrator and Phase Compensator

FREQUENCY (Hz)

–1.0

–6.0

–1.5

–2.0

–2.5

–3.5

–4.5

–5.5

–3.0

–4.0

–5.0

02875-0-038

Figure 27. Combined Gain Response of the

Digital Integrator and Phase Compensator (40 Hz to 70 Hz)

–89.75

–89.80

–89.85

–89.90

–89.95

–90.00

FREQUENCY (Hz)

–90.05

–89.70

02875-0-039

Figure 28. Combined Phase Response of the

Digital Integrator and Phase Compensator (40 Hz to 70 Hz)

Note that the integrator has a –20 dB/dec attenuation and an

approximately –90° phase shift. When combined with a di/dt

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