ADE7758ARWRL datasheet(25/68 Pages) AD

25 / 68 page

ADE7758

Rev. A | Page 25 of 68

The phase calibration registers (APHCAL, BPHCAL, and

CPHCAL) are twos complement, 7-bit signed registers that can

vary the time advance/delay in the voltage channel signal path

from –151.2 µs to +75.6 µs (CLKIN = 10 MHz). One LSB is

equivalent to 1.2 µs of time delay or 2.4 µs of time advance.

With a line frequency of 50 Hz, this gives a phase resolution of

0.026° at the fundamental, i.e., 360° × 1.2 µs × 60 Hz, in the positive

direction and 0.052° in the negative direction. This corresponds to

a total correction range of −2.72° to +1.36° at 50 Hz.

Figure 56 illustrates how the phase compensation is used to

remove a 0.1° phase lead in IA of the current channel from the

external current transducer. In order to cancel the lead (0.1°) in

the current channel of Phase A, a phase lead must be introduced

into the corresponding voltage channel. The resolution of the

phase adjustment allows the introduction of a phase lead of

0.104°. The phase lead is achieved by introducing a time advance

into VA. A time advance of −4.8 µs is made by writing −4 (0x3C)

to the time delay block (APHCAL[7:0]), thus reducing the

amount of time delay by 4.8 µs or equivalently, 360° × 4.8 µs ×

60 Hz = 0.104° at 60 Hz.

100

200

300

400

500

600

700

800

900

FREQUENCY (Hz)

Figure 53. Phase Response of the HPF and Phase Compensation

(10 Hz to 1 kHz)

0.20

0.15

0.10

0.05

–0.05

–0.10

FREQUENCY (Hz)

Figure 54. Phase Response of the HPF and Phase Compensation

(40 Hz to 70 Hz)

0.10

0.08

0.06

0.04

0.02

–0.02

FREQUENCY (Hz)

Figure 55. Gain Response of HPF and Phase Compensation

(44 Hz to 56 Hz)

PGA1

IAP

IAN

ADC

HPF

PGA2

VAP

ADC

60Hz

0.1°

RANGE OF PHASE

CALIBRATION

111 11 00

APHCAL[6:0]

–151.2

µs TO +75.6µs

VA DELAYED BY 4.8

µs

(–0.104

° @ 60Hz)

0x7C

60Hz

DIGITAL

INTEGRATOR

ACTIVE AND

REACTIVE

ENERGY

CALCULATION

+1.36°, –2.72° @ 50Hz; 0.022°, 0.043°

+1.63°, –3.28° @ 60Hz; 0.026°, 0.052°

Figure 56. Phase Calibration on Voltage Channels

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