ADE7758_15 datasheet(24/72 Pages) AD

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ADE7758

Data Sheet

Rev. E | Page 24 of 72

0.20

0.15

0.10

0.05

–0.05

–0.10

FREQUENCY (Hz)

respectively. Negative values written to the PHCAL registers

represent a time advance, and positive values represent a time

delay. One LSB is equivalent to 1.2 μs of time delay or 2.4 μs of

time advance with a CLKIN of 10 MHz. With a line frequency

of 60 Hz, this gives a phase resolution of 0.026° (360° × 1.2 μs ×

60 Hz) at the fundamental in the positive direction (delay) and

0.052° in the negative direction (advance). This corresponds to

a total correction range of −3.32° to +1.63° at 60 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. 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

−2 (0x7E) to the time delay block (APHCAL[6:0]), thus

reducing the amount of time delay by 4.8 μs or equivalently,

360° × 4.8 μs × 60 Hz = 0.104° at 60 Hz.

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)

100

200

300

400

500

600

700

800

900

FREQUENCY (Hz)

Figure 55. Phase Response of HPF and Phase Compensation

(44 Hz to 56 Hz)

Figure 53. Phase Response of the HPF and Phase Compensation

(10 Hz to 1 kHz)

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