STEVAL-IPE012V1 STMicroelectronics, STEVAL-IPE012V1 Datasheet - Page 38

• 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

Theory of operation
Figure 26. Active energy computation diagram
38/51
At this point four signals are available. By combining (pairing) them by means of two
multiplying stages, two results are obtained:
Equation 11
[see
Equation 12
[see
After these two operations, another stage performs the subtraction between the results p
and p
p
p
/
/
1
2
) t (
) t (
Figure 26
Figure 26
1
=
=
and a division by 2, obtaining the active power:
dv
v
dt
) t (
⋅
⋅
∫
i
) t (
i
) t (
- 9]
- 10]
=
⋅
dt
V
=
⋅ ⋅
I
−
2
cos
V
⋅ ⋅
I
ϕ
Doc ID 17728 Rev 3
2
cos
−
V
ϕ
⋅ ⋅
I
−
cos(
V
⋅ ⋅
2
I
2
cos(
ω
t
2
+
2
ϕ
ω
)
t
+
ϕ
)
STPM10
2