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CS5467
16 DS714F3
4.8 Power and Energy Results
The instantaneous voltage and current samples are
multiplied to obtain the instantaneous power (
P1, P2)
(see Figure 3 and 4). The product is then averaged over
N conversions to compute active power (P1
AVG
,
P2
AVG
).
Apparent power (
S1, S2) is the product of RMS voltage
and current as shown:
Power factor (
PF1, PF2) is active power divided by ap-
parent power as shown below. The sign of the power
factor is determined by the active power.
Wideband reactive power (
Q1
WB
, Q2
WB
) is calculated
by doing a vector subtraction of active power from ap-
parent power.
Quadrature power (
Q1, Q2) are sample rate results ob-
tained by multiplying instantaneous current (
I1, I2) by in-
stantaneous quadrature voltage (
V1Q, V2Q) which are
created by phase shifting instantaneous voltage (
V1,
V2) 90 degrees using first-order integrators. (See Fig-
ure 3 and 4). The gain of these integrators is inversely
related to line frequency, so their gain is corrected by
the
Epsilon register, which is based on line frequency.
Reactive power (
Q1
Avg
, Q2
AvG
) is generated by inte-
grating the instantaneous quadrature power over
N
samples.
Active power (
P1
AVG
, P2
AVG
), apparent power (S1, S2),
and reactive power (
Q1
AVG
, Q2
AVG
) of the two channels
are summed up and then divided by 2. The calculation
results are placed in
E
PULSE
, S
PULSE
, and Q
PULSE
reg-
isters which can be configured to drive energy pulse
outputs. (See Figure 6.)
V1
ACOFF
(V2
ACOFF
)
I1
ACOFF
(I2
ACOFF
)
P1
OFF
(P2
OFF
)
Figure 5. Low-rate Calculations
SV
RMS
I
RMS
=
PF
P
Active
S
------------------
=
Q
WB
S
2
P
Active
2
–=
P1
AVG
÷2
P2
AVG
E
PULSE
E
ACCM
+ × +
OVF=
S1
÷2
S2
S
PULSE
S
ACCM
+ × +
OVF=
Q1
AVG
÷2
Q2
AVG
Q
PULSE
Q
ACCM
+ × +
OVF=
PulseRate
( E1, E2, E3 )
Figure 6. Two-channel Power Summation
- Four-channel Power/Energy IC 1
- TABLE OF CONTENTS 2
- DS714F3 3 3
- LIST OF FIGURES 4
- LIST OF TABLES 4
- 1. OVERVIEW 5
- 2. PIN DESCRIPTION 6
- ANALOG CHARACTERISTICS 7
- --------- 8
- VOLTAGE REFERENCE 9
- DIGITAL CHARACTERISTICS 10
- SWITCHING CHARACTERISTICS 11
- 12 DS714F3 12
- ABSOLUTE MAXIMUM RATINGS 13
- 4. SIGNAL PATH DESCRIPTION 14
- 4.5 High-pass Filters 15
- 4.6 Low-Rate Calculations 15
- 4.7 RMS Results 15
- 4.8 Power and Energy Results 16
- 4.9 Peak Voltage and Current 17
- 4.10 Power Offset 17
- 5. PIN DESCRIPTIONS 18
- 5.2.5 Serial Interface 19
- 6. SETTING UP THE CS5467 20
- 6.8 No Load Threshold 21
- 6.9 Energy Pulse Width 21
- 6.10 Energy Pulse Rate 21
- 6.12 Epsilon 22
- 6.13 Temperature Measurement 22
- 7. USING THE CS5467 23
- 7.4 Command Interface 24
- 7.5 Register Paging 24
- 7.6 Commands 25
- 7.6.4 Calibration 26
- DS714F3 27 27
- Page register at address 31 27
- 28 DS714F3 28
- 8. REGISTER DESCRIPTIONS 29
- DS714F3 33 33
- 8.3 Page 1 Registers 34
- 38 DS714F3 38
- 8.4 Page 2 Registers 39
- 8.5 Page 5 Register 39
- 9.1 Calibration 40
- 9.1.1 Offset Calibration 40
- 9.1.2 Gain Calibration 41
- 9.1.3 Calibration Order 41
- • Xicor X25040SI 42
- DS714F3 43 43
- 28L SSOP PACKAGE DRAWING 44
- CS5467-ISZ (lead free) 45
- 15. REVISION HISTORY 46
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