ADE5166 datasheet(47/148 Pages) AD

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ADE5166/ADE5169

Rev. 0 | Page 47 of 148

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For calibration, a first measurement should be done on IPA by

setting the SEL_I_CH bits to 0b01 in the CALMODE register

(Address 0x3D). This measurement should be compared to the

measurement on IPB. Measuring IPB can be forced by setting the

SEL_I_CH bits to 0b10 in the CALMODE register (Address 0x3D).

The gain error between these two measurements can be evaluated

using the following equation:

( )

()

Measuremen

Error

−

The two channels, IPA and IPB, can then be matched by writing

–Error(%)/(1 + Error(%)) × 212 to the IBGAIN register

(Address 0x1C). This matching adjustment is valid for all

energy measurements made by the ADE5166/ADE5169,

including active power, reactive power (the ADE5169 only),

apparent power, and Irms.

di/dt CURRENT SENSOR AND DIGITAL INTEGRATOR

(ADE5169)

A di/dt sensor, a feature available for the ADE5169, detects changes

in the magnetic field caused by ac currents. Figure 46 shows the

principle of a di/dt current sensor.

FREQUENCY (Hz)

–10

–20

–30

–40

–50

100

1000

FREQUENCY (Hz)

102

103

FREQ

MAGNETIC FIELD CREATED BY CURRENT

(DIRECTLY PROPORTIONAL TO CURRENT)

+ EMF (ELECTROMOTIVE FORCE)

– INDUCED BY CHANGES IN

MAGNETIC FLUX DENSITY (di/dt)

Figure 46. 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 deter-

mined 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 ADE5169 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 ADE5169

is powered up. Setting the INTE bit (Bit 5) in the MODE1 register

(Address 0x0B) turns on the integrator. Figure 47 to Figure 50

show the gain and phase response of the digital integrator.

Figure 47. Combined Gain Response of the Digital Integrator and

Phase Compensator

–88.0

–88.5

–89.0

–89.5

–90.0

–90.5

Figure 48. 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

Figure 49. Combined Gain Response of the Digital Integrator and

Phase Compensator (40 Hz to 70 Hz)

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