Datasheet

Theory of operation STPM10
40/53 Doc ID 17728 Rev 4
Equation 9
dv/dt → v(t) = V
⋅ sin ωt; [see Figure 26 - 7]
Equation 10
i(t) →
[see Figure 26 - 8]
At this point four signals are available. By combining (pairing) them by means of two
multiplying stages, two results are obtained:
Equation 11
[see Figure 26 - 9]
It() i
∫
t() dt
I
ω
--
wt ϕ+()cos⋅–=⋅=
Figure 26. Active energy computation diagram
p
1
t()
d
v
d
t
-----
i
∫
t() dt⋅⋅
VI ϕcos⋅⋅
2
---------------------------------
VI 2wtϕ+()cos⋅⋅
2
-------------------------------------------------------––==