STEVAL-IPE008V1 STMicroelectronics, STEVAL-IPE008V1 Datasheet - Page 53

• Manufacturer Part Number: STEVAL-IPE008V1
• Description: BOARD EVAL STPM01/STR715FR0
• Manufacturer: STMicroelectronics
• Type: Other Power Managementr

Specifications of STEVAL-IPE008V1

• Main Purpose: Power Management, Energy/Power Meter
• Embedded: Yes, MCU, ARM7
• Utilized Ic / Part: STPM01, STR715FR0
• Primary Attributes: 3-Ph Energy Meter (or Single Phase)
• Secondary Attributes: Measures Active, Reactive, Apparent Power
• Product: Power Management Modules
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: STPM01, STR715FR0
• Other names: 497-6412; STEVAL-IPE008V1

STPM01
10
Table 20.
Table 21.
Note:
Line voltage interface
Line current interface
Function
Function
Application Design
The choice of the external components in the transduction section of the application is a
crucial point in the application design, affecting the precision and the resolution of the whole
system.
Among the several considerations, a compromise has to be found between the following
needs:
1.
2.
3.
To maximize the signal to noise ratio of the current channel the voltage divider resistors ratio
should be as close as possible to those shown in
Resistor divider ratio
The
properties:
●
●
●
Typical values for the current sensors sensitivity, also used in the reference schematic
below, are shown in
Current channel typical components
If the device is used in configuration PST = 7 (primary channel with CT, secondary channel
with Shunt), the shunt Ks must always be equal to one fourth of the current transformer Ks.
Additional considerations on the application design, suggestions for noise and crosstalk
reduction can be found in the AN2317.
Figure 29
Maximize the signal to noise ratio in the voltage channel,
Choose the current to voltage conversion ratio Ks and the voltage divider ratio in a way
that calibration can be achieved (please refer to AN2299)
Choose Ks to take advantage of the whole current dynamic range according to desired
maximum current and resolution.
P = 64000 imp/KWh
I
I
NOM
MAX
= 60 A.
Resistor divider
Current shunt
Current transformer
Rogowsky coil
= 5 A
below shows a reference schematic for an application with the following
Component
Component
Table
21.
Doc ID 10853 Rev 7
R to R ratio V
R to R ratio V
Current to voltage conversion ratio Ks
RMS
RMS
Parameter
Parameter
=230V
=110V
Table
20.
Application Design
Value
Value
0.425
1650
0.13
830
1.7
mV/A
Unit
Unit
V/V
53/60