STPMC1 datasheet(44/77 Pages) STMICROELECTRONICS

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Theory of operation

STPMC1

44/77

Doc ID 15728 Rev 6

Example 16: Phase compensation for PM = 1

Phase shift current for -

phc:

CPC[1] = 0

Kphc = - (32 CpC[1:0] + 16 CPC[0] + CPX[3:0])

Phase shift current for

phc:

CPC[1] = 1

Kphc = 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, fline = 50 Hz

CLK

HSA

fphc

phc

Δφphc

4.194 MHz

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°

CPX[0]

CPX[1]

CPX[2]

CPX[3]

CPC[0]

CpC[1]

CpC[0]

CPX[0]

CPX[1]

CPX[2]

CPX[3]

CPC[0]

CpC[0]

(

± 3.1 %)

() []

[]

8192

CCA

⋅

−

(

± 3.1 %)

() []

[]

8192

CCB

CCA

⋅

−

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