Datasheet

Data Sheet ADE9153A
Rev. 0 | Page 23 of 50
High-Pass Filter
A high-pass filter removes dc offsets for accurate rms and energy
measurements. This filter is enabled by default and features a
corner frequency of 1.25 Hz.
To disable the high-pass filter on all current and voltage channels,
set the HPFDIS bit in the CONFIG0 register. The corner frequency
is configured with the HPF_CRN bits in the CONFIG2 register.
Digital Integrator
A digital integrator is included on Current Channel B for the
possibility of interfacing with a di/dt current sensor, also known
as Rogowski coils. It is important to take note that the integrator
cannot be used with any of the mSure functions. To configure
the digital integrator, use the INTEN_BI bits in the CONFIG0
register. The digital integrator is disabled by default.
Phase Compensation
The ADE9153A provides a phase compensation register for
each current channel: APHASECAL and BPHASECAL. The
phase calibration range is −15° to +2.25° at 50 Hz and −15° to
+2.7° at 60 Hz.
Use the following equation to calculate the xPHASECAL value
for a given phase correction (φ)° angle. Phase correction (φ)° is
positive to correct a current that lags the voltage, and negative
to correct a current that leads the voltage, as seen in a current
transformer.
xPHASECAL =
27
2
)–2sin(
sin)–sin(











ω = 2π × f
LINE
/f
DSP
where:
f
LINE
is the line frequency.
f
DSP
= 4 kHz.
Voltage Channel
The ADE9153A has a single voltage channel with the datapath
shown in Figure 44. The AVGAIN register calibrates the voltage
channel and has the same scaling as the xIGAIN registers.
RMS and Power Measurements
The ADE9153A calculates total values of rms current, rms voltage,
active power, fundamental reactive power, and apparent power.
The algorithm for computing the fundamental reactive power
requires initialization of the network frequency using the
SELFREQ bit in the ACCMODE register and the nominal
voltage in the VLEVEL register.
Calculate the VLEVEL value according to the following
equation:
VLEVEL = x × 1,444,084
where x is the dynamic range of the nominal voltage input
signal with respect to full scale.
For example, if the signal is at ½ of full scale, x = 2. Therefore,
VLEVEL = 2 × 1,444,084
Tota l RMS
The ADE9153A offers total current and voltage rms measurements
on all channels. Figure 45 shows the datapath of the rms
measurements.
x
2
15
xRMS_OS
xRMS
0
–0.064%
+0.064%
A
V_WAV OR xI_WAV
V
OLTAGE OR CURRENT
CHANNELWAVEFORM
LPF2
52725703
16519-145
Figure 45. Filter-Based Total RMS Datapath
The total rms calculations, one for each channel (AIRMS,
BIRMS, and AVRMS), are updated every 4 kSPS. The xIRMS
value at full scale is 52,725,703 codes. The xVRMS value at full
scale is 26,362,852 codes. The total rms measurements can be
calibrated for gain and offset. Perform gain calibration on the
respective Current A voltage channel datapath with the xGAIN
registers. The following equation indicates how the offset
calibration registers modify the result in the corresponding
rms registers:
xRMS =
OSxRMOSxRMS _2
15
2
0

where xRMS
0
is the initial xRMS register value before offset
calibration.
Tota l Active Power
The ADE9153A offers a total active power measurement. The
datapath for the total active power measurement is shown in
Figure 46.
APGAIN AWATT_OS
AWATT
LPF2
CONFIG0.
DISAPLPF
AI_WAV
AV_ WAV
ENERGY/
POWER/
CF ACCUMULATION
16519-146
Figure 46. Total Active Power (AWATT) Datapath
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