STEVAL-IPE009V1 STMicroelectronics, STEVAL-IPE009V1 Datasheet - Page 35

• Manufacturer Part Number: STEVAL-IPE009V1
• Description: BOARD EVAL ST72321BR9/STPM14
• Manufacturer: STMicroelectronics
• Type: Other Power Managementr

Specifications of STEVAL-IPE009V1

• Main Purpose: Power Management, Energy/Power Meter
• Embedded: Yes, MCU, 8-Bit
• Utilized Ic / Part: STPM14, ST72F321BR9T6
• Primary Attributes: 1-Ph 220 VAC, LCD Displays: No-Load, Reverse, Fraud, or Case Tampering
• Secondary Attributes: Up to 4 Tariff Rates, Data Accumulated for Meter Life, Time Stamp for: Tamper, Fraud, Power Failure
• Input Voltage: 220 V
• Product: Power Management Modules
• Silicon Manufacturer: ST Micro
• Silicon Core Number: ST72321BR9 And STPM14
• Features: Continuously Detects, Displays No-Load Condition, Reverse Direction, Fraud And Case Tamper Condition
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: STPM14, ST72321BR9
• Other names: 497-8434; STEVAL-IPE009V1

STPM11, STPM12, STPM13, STPM14
In the STPM1x, 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
differentiate stage which transforms:
Equation 9
v(t) → v’(t) = dv/dt = V
The result, together with the pre-processed and digitalized current signal:
Equation 10
i(t) = I
can then be used to calculate. These digital signals are also used in two additional steps for
integration, obtaining:
Equation 11
dv/dt → v(t) = V
Equation 12
(see [8] in
Now four signals are available. Combining (pairing) them by two multiplication steps two
results are obtained:
Equation 13
(see [9] in
Equation 14
(see [10] in
After these two operations, another stage another step involves the subtraction of p1 from
p2 and dividing the result by 2, to obtain the active power:
Equation 15
(see [12] in
In this way, the AC part
p
p
p
/
/
1
2
) t (
) t (
) t (
=
=
=
⋅
p (
sin (tω + ϕ); (see [6] in
dv
dt
v
/
) t (
2
Figure
Figure
) t (
⋅
Figure
Figure
∫
⋅
i
) t (
i
2
−
) t (
⋅
p
/
=
sin tω; (see [7] in
22)
22)
⋅
1
dt
22)
22)
(
V
)) t
=
⋅ ⋅
i(t)
⋅
I
=
−
ω
2
cos
⋅
V
V
⋅
I
cos tω; (see [5] in
) t (
⋅ ⋅
⋅ ⋅
I
I
ϕ
Doc ID 13167 Rev 7
2
Figure
=
cos
2
cos
−
∫
V
i
Figure
) t (
ϕ
ϕ
⋅ ⋅
I
−
22)
⋅
dt
cos(
V
22)
=
⋅ ⋅
2
I
−
2
cos(
Figure
ω
ω
I
t
⋅
2
+
cos(
2
ϕ
ω
)
22);
t
ω
+
t
ϕ
+
)
ϕ
Energy calculation algorithm
)
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