STEVAL-IPE012V1 STMicroelectronics, STEVAL-IPE012V1 Datasheet - Page 44

• Manufacturer Part Number: STEVAL-IPE012V1
• Description: EVAL BOARD ENERGY METER
• Manufacturer: STMicroelectronics
• Series: -r

Specifications of STEVAL-IPE012V1

• Design Resources: STEVAL-IPE012V1 Schematic STEVAL-IPE012V1 BOM
• Main Purpose: Power Management, Energy/Power Meter
• Embedded: Yes, MCU, 8-Bit
• Utilized Ic / Part: STPM10BTR, STM8L152
• Primary Attributes: Single Phase with 1 Current Transformer & Shunt
• Secondary Attributes: Tamper Detection
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 497-11462

Application design
8
Table 15.
Table 16.
Note:
44/51
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 = 1, TMP = 1 (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 27
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 16
.
Doc ID 17728 Rev 3
R to R ratio V
R to R ratio V
Current to voltage conversion ratio Ks
RMS
RMS
Parameter
Parameter
=230V
=110V
Table 15
.
Value
Value
0.425
1650
0.13
830
1.7
STPM10
mV/A
Unit
Unit
V/V