STEVAL-IPE010V1 STMicroelectronics, STEVAL-IPE010V1 Datasheet - Page 72

• Manufacturer Part Number: STEVAL-IPE010V1
• Description: KIT DEMO ENERGY METER STPMC1/S1
• Manufacturer: STMicroelectronics
• Type: Other Power Managementr

Specifications of STEVAL-IPE010V1

• Main Purpose: Power Management, Energy/Power Meter
• Embedded: No
• Utilized Ic / Part: STPMC1, STPMS1
• Maximum Operating Temperature: + 85 C
• Product: Power Management Development Tools
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Secondary Attributes: -
• Primary Attributes: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• For Use With/related Products: STPMC1, STPMS1
• Other names: 497-10754

Energy calculation algorithm
10.5
72/77
The DSP performs also an integration of powers (P, Q) into energies:
Equation 54
AW = U
Equation 55
AW = U
These integrators are implemented as up/down counters and they can roll over.
20-bit output buses of the counters are assigned as the most significant part of the energy
data records. It is a responsibility of the application to read the counters at least every
second so as not to miss any rollover. The integration of power can be suspended due to
detected error on the source signals or due to no load condition. From AW, stepper output
signals are generated.
Fundamental power calculation
The fact that integration suppresses all but fundamental components of signals is used to
compute the fundamental active power, which is in case of Rogowski coil:
Equation 56
F
Equation 57
F
Equation 58
F = (F
Similar result are found in case of non Rogowski sensor:
Equation 59
F
Equation 60
F
Equation 61
F = (F
The fundamental reactive power in case of a Rogowski coil is:
Equation 62
Q = v
Similar results are found in cases of non Rogowski sensors:
Equation 63
Q = v
1
2
1
2
) k
= v
= v
= v
= v
P
uiic
diic
uic
iic
2
dic
sic
2
RMS
RMS
- F
- F
v
v
v
v
v
v
uiic
iiic
siic
diic
iiic
siic
1
1
) / 2 = (AB cos ) k
) / 2 = - AC cos (2
I
I
RMS
RMS
= - ABk
= - ABk
= - AC sin ( t) sin ( t + ) = - AC [cos
= - ACk
/ k
/ k
INT
cos
sin
INT
INT
INT
= - ABk
DIF
= - AC cos ( t) sin ( t + ) = AC [sin
k
k
cos ( t) cos ( t + ) = - ABk
sin ( t) sin ( t + ) = ABk
k
P
P
INT
k
k
UD
UD
INT
cos ( t) cos ( t + ) = - AC [cos
INT
Doc ID 15728 Rev 4
cos ( t) sin ( t + ) = ABk
t + ) = Uk
/ 2 = (Uk
D
D
Ik
Ik
L
s
cos ) k
cos (2
INT
INT
[cos
INT
- cos (2
t + ) / 2 = U
[cos
/ 2 = U
INT
- cos (2
- sin (2
[sin
+ cos (2
+ cos (2
RMS
t + )] / 2
- sin (2
RMS
I
RMS
t + )] / 2.
t + )] / 2
I
RMS
t + )] / 2
cos
t + )] / 2
t + )] / 2
cos (2
k
P
STPMC1
t +