STEVAL-IPE012V1 STMicroelectronics, STEVAL-IPE012V1 Datasheet - Page 37

• 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

STPM10
7.23.1
where I is the peak current,
between voltage and current.
Active power
In the STPM10, after the pre-conditioning and the A/D conversion, the digital voltage signal
(which is dynamically more stable with respect to the current signal) is processed by a
differentiator stage which transforms:
Equation 7
v(t) → v’(t) = dv/dt = V
the resulting signal, together with the pre-processed and digitalized current signal:
Equation 8
i(t) = I
are then available for the calculation process. These digital signals are also provided to two
additional stages, which then integrate of themselves, obtaining:
Equation 9
dv/dt → v(t) = V
Equation 10
i(t) →
[see
I
) t (
=
Figure 26
∫
⋅
i
sin(
) t (
⋅
ω
dt
t +
- 8]
=
⋅
ϕ
sin
−
); [see
ω
I
ω
⋅
t; [see
⋅ ω ⋅
cos(
Figure 26
cos
ω
ω
Figure 26
t
Doc ID 17728 Rev 3
is related to the line frequency and
+
ω
ϕ
t − [see
)
- 6]
- 7]
Figure 26
- 5]
ϕ
is the phase difference
Theory of operation
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