ADE7753 View Datasheet(PDF) - Analog Devices
Part Name
Description
MFG CO.
'ADE7753' PDF : 60 Pages View PDF
CALCULATE CFDEN VALUE FOR DESIGN
WRITE CFDEN VALUE TO CFDEN REGISTER
ADDR. 0x15 = CFDEN
SET ITEST = Ib, VTEST = VNOM, PF = 1
SET HALF LINE CYCLES FOR ACCUMULATION
IN LINECYC REGISTER ADDR. 0x1C
SET MODE FOR LINE CYCLE
ACCUMULATION ADDR. 0x09 = 0x0080
ENABLE LINE CYCLE ACCUMULATION
INTERRUPT ADDR. 0x0A = 0x04
RESET THE INTERRUPT STATUS
READ REGISTER ADDR. = 0x0C
ADE7753
NO
INTERRUPT?
YES
RESET THE INTERRUPT STATUS
READ REGISTER ADDR. = 0x0C
NO
INTERRUPT?
YES
READ LINE ACCUMULATION ENERGY
ACTIVE ENERGY: ADDR. 0x04
APPARAENT ENERGY: ADDR. 0x07
CALCULATE WGAIN. SEE EQUATION 47.
WRITE WGAIN VALUE TO ADDR. 0x12
CALCULATE VAGAIN. SEE EQUATION 69.
WRITE VGAIN VALUE TO ADDR. 0x1A
Figure 87. Active/Apparent Gain Calibration
02875-A-004
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.
Rev. C | Page 47 of 60
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