ADE5166 datasheet(52/156 Pages) AD

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ADE5166/ADE5169/ADE5566/ADE5569

Rev. B | Page 52 of 156

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

setting the SEL_I_CH bits (Bits[5:4]) to 0b01 in the CALMODE

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

the SEL_I_CH bits (Bits[5:4]) to 0b10 in the CALMODE register

(Address 0x3D). The gain error between these two measurements

can be evaluated using the following equation:

Error (%) =

)

(

)

(

)

(

Measuremen

−

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/ADE5569 ONLY)

The di/dt sensor, a feature available for the ADE5169/ADE5569,

detects changes in the magnetic field caused by ac currents.

Figure 50 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 50. 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/ADE5569 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/ADE5569 is powered up. Setting the INTE bit (Bit 5)

in the MODE1 register (Address 0x0B) turns on the integrator.

Figure 51 to Figure 54 show the gain and phase response of the

digital integrator.

FREQUENCY (Hz)

–10

–20

–30

–40

–50

100

1000

Figure 51. Combined Gain Response of the Digital Integrator and

Phase Compensator

FREQUENCY (Hz)

102

103

FREQ

–88.0

–88.5

–89.0

–89.5

–90.0

–90.5

Figure 52. 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 53. Combined Gain Response of the Digital Integrator and

Phase Compensator (40 Hz to 70 Hz)

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