Datasheet

Theory of operation STPMC1
44/77 Doc ID 15728 Rev 7
Example 16: Phase compensation for PM = 1
Phase shift current for -ϕ
phc
:
CPC
[1] = 0
K
phc
= - (32 CpC[1:0] + 16 CPC[0] + CPX[3:0])
Phase shift current for
ϕ
phc
:
CPC
[1] = 1
K
phc
= 64 - (32 CpC[0] + 16 CPC[0] + CPX[3:0])
9.16.3 Mutual current compensation
Mutual current compensation is available only when TCS is clear (Rogowski coil).
When PM
is cleared, the CCA and CCB configuration bytes can be used for mutual current
influence compensation according to SYS
value.
For monophase systems (SYS
> 3) the correction factors, α (alpha) and β (beta), are
computed as follows:
Equation 5
Equation 6
Table 28. Phase compensation for PM
= 1, f
line
= 50 Hz
CLK HSA f
phc
φ
phc
Δφ
phc
4.194 MHz
X
2.097 MHz +0.549°, -1.090° 0.009°
4.915 MHz 2.458 MHz +0.469°, -0.930° 0.007°
8.192 MHz 2.048 MHz +0.562°, -1.116° 0.009°
9.830 MHz 2.458 MHz +0.469°, -0.930° 0.007°
1 2 4 8 16
CPX[0]
CPX[1] CPX[2]
CPX[3] CPC[0]
i
u
32 64
CpC[1]
CpC[0]
1 2 4 8
64
CPX[0]
CPX[1] CPX[2]
CPX[3]
i
u
16
CPC[0]
32
CpC[0]
( ± 3.1 %)
()
[]
[]
8192
0:7CCA1
8CCA
⋅−
=α
( ± 3.1 %)
()
[]
[]
8192
0:7CCB1
8CCA
⋅−
=β