STEVAL-IPE010V1 STMicroelectronics, STEVAL-IPE010V1 Datasheet - Page 71

• 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

STPMC1
10.3
10.4
Voltage and current RMS values calculation
The I
Equation 49
The Ui
Equation 50
In case of non Rogowski sensor, the same dedicated RMS blocks produce some other
values, because input values for the blocks are changed.
Therefore, another RMS value, named Ii
Equation 51
The U
Equation 52
Energy integration
The internal hard-wired DSP unit performs all the computations above in real time for a
power line in parallel by means of arithmetic blocks. Due to implementation of an integrator,
up/down counter or deviator, part of which is also an integrator in a feedback, additional
factors are introduced into computations. If we declare f
frequency and M as number of possible values of some integrator, the following constant
factors can be defined:
Equation 53
k
k
k
I
Ui
Ii
U
INT
UD
DIF
RMS
RMS
RMS
RMS
k
= 2 f
= 2 f
= M
k
RMS
k
L
k
S
RMS
k
D
RMS
D
k
INT
INT
=
DIF
=
MCLK
MCLK
value is produced from 16-bit value of
=
is produced from stream and 16-bit value of
=
is produced from stream and 16-bit value of
/ 2 f
T
1
T
1
∫
T
0
T
1
T
∫
/ M
0
/ M
T
1
v
MCLK
v
T
∫
0
T
∫
0
2
di
v
UD
2
ui
INT
v
dt
dt
2
ii
2
si
dt
= 2
dt
= 2
= 2
= A
= Ak
= B
= C/
11
-8
8
INT
1
2
2
1
/
Doc ID 15728 Rev 4
1
2
1
2
RMS
is produced from 16-bit value of
Equation 16
Equation 24
Equation 15
MCLK
:
Energy calculation algorithm
as the measurement clock
:
:
Equation 25
71/77
: