ADE7753ARSRL datasheet(47/60 Pages) AD

47 / 60 page

ADE7753

Rev. C | Page 47 of 60

CALCULATE CFDEN VALUE FOR DESIGN

WRITE CFDEN VALUE TO CFDEN REGISTER

ADDR. 0x15 = CFDEN

SET HALF LINE CYCLES FOR ACCUMULATION

IN LINECYC REGISTER ADDR. 0x1C

SET ITEST = Ib, VTEST = VNOM, PF = 1

CALCULATE WGAIN. SEE EQUATION 47.

SET MODE FOR LINE CYCLE

ACCUMULATION ADDR. 0x09 = 0x0080

ENABLE LINE CYCLE ACCUMULATION

INTERRUPT ADDR. 0x0A = 0x04

READ LINE ACCUMULATION ENERGY

ACTIVE ENERGY: ADDR. 0x04

APPARAENT ENERGY: ADDR. 0x07

RESET THE INTERRUPT STATUS

READ REGISTER ADDR. = 0x0C

INTERRUPT?

YES

02875-A-004

RESET THE INTERRUPT STATUS

READ REGISTER ADDR. = 0x0C

INTERRUPT?

WRITE WGAIN VALUE TO ADDR. 0x12

CALCULATE VAGAIN. SEE EQUATION 69.

WRITE VGAIN VALUE TO ADDR. 0x1A

Figure 87. Active/Apparent Gain Calibration

Reactive Energy

Reactive energy is only available in line accumulation mode in

the ADE7753. The accumulated reactive energy over LINECYC

number of half line cycles is stored in the LVARENERGY register.

In the ADE7753, a low-pass filter at 2 Hz on the current

channel is implemented for the reactive power calculation. This

provides the 90 degree phase shift needed to calculate the reactive

power. This filter introduces 1/f attenuation in the reactive

energy accumulated. Compensation for this attenuation can be

done externally in a microcontroller. The microcontroller can

use the LVARENERGY register in order to produce a pulse

output similar to the CF pulse for reactive energy.

To create a VAR pulse, an impulse/VARh constant must be

determined. The 1/f attenuation correction factor is determined

by comparing the nominal reactive energy accumulation rate to

the expected value. The attenuation correction factor is multi-

plied by the contents of the LVARENERGY register, with the

ADE7753 in line accumulation mode.

ADE7753ARSRL 数据表(PDF) 47 Page - Analog Devices

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