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STPM13 Datasheet(PDF) 34 Page - STMicroelectronics

Part # STPM13
Description  Single phase energy metering IC with pulsed output and digital calibration
PDF  46 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STPM13 Datasheet(HTML) 34 Page - STMicroelectronics

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Energy calculation algorithm
STPM11, STPM12, STPM13, STPM14
34/46
Doc ID 13167 Rev 8
8
Energy calculation algorithm
Inside the STPM1x the computing section of the measured active power uses a completely
new patented signal process approach. This approach allows the device to reach high
performances in terms of accuracy.
The signals, coming from the sensors, for the instantaneous voltage is:
Equation 7
v(t) = V•sin
ωt; where V is the peak voltage and ω is related to the line frequency
and the instantaneous current is:
Equation 8
i(t) = I • sin (
ωt + ϕ); where I is the peak current, ω is related to the line frequency and ϕ is
the phase difference between voltage and current
Active power
Figure 22.
Active energy computation diagram
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